CN1467524A - Camera shooting lens unit and pick-up device and method for manufacturing same - Google Patents
Camera shooting lens unit and pick-up device and method for manufacturing same Download PDFInfo
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- CN1467524A CN1467524A CNA031098576A CN03109857A CN1467524A CN 1467524 A CN1467524 A CN 1467524A CN A031098576 A CNA031098576 A CN A031098576A CN 03109857 A CN03109857 A CN 03109857A CN 1467524 A CN1467524 A CN 1467524A
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Abstract
Image pickup lens unit and image pickup device and method for manufacturing same. Lenses 1, 2, and 4 as an optical element having a power are cemented together in an optical axis direction. An optical filter 3 is sandwiched between the lenses 2 and 4. Optical elements neighboring each other are cemented together such that a positioning section which is disposed on a side surface of the optical element disposes an appropriate space in an optical axis direction and optical axes of optical elements align in a direction orthogonal to the optical axis. The cemented optical element arrays are cemented together and cut at a line for cutting operation. By doing this, it is possible to manufacture a small image pickup lens unit which can be used for an image pickup device in mass-production and in a low cost.
Description
Invention field
The present invention relates to imaging lens unit and camera head and manufacture method thereof.
Background technology
Now, for example camera lens etc. utilize the imaging lens unit of a plurality of lens be lens are ground or moulding after, carry out mutual position alignment in the picture frames such as metal that carried out high-precision processing and fixedly form by it is configured in.Then, will be installed in the camera head with imaging apparatus with the incorporate imaging lens unit of such picture frame.
But above-mentioned this existing imaging lens unit and camera head also will spend fee of material, the processing charges of picture frame and be installed to the assembling expense of picture frame except the manufacturing expense of lens, therefore have the problem that is difficult to reduce cost.Particularly, for example camera heads such as anti-theft image pick-up machine or endoscope have the more and more littler tendency of requirement imaging lens unit.Therefore, the manufacturing, the assembling that are used for the imaging lens unit of this class camera head become and more and more bother, and cause producing the problem of Production Time and cost of manufacture increase.
Summary of the invention
The present invention proposes in view of the above problems, and purpose provides a kind of both small-sized and can be in a large number and imaging lens unit of making at an easy rate and camera head.
For achieving the above object, according to a first aspect of the invention, a kind of imaging lens unit with a plurality of optical elements is provided, it is characterized in that, described a plurality of optical element is bonded with each other with overlapping state, under this overlapping state, and the optical axis unanimity of each optical element, the side of each optical element is configured in along in the same plane of the linearly extension of prescribed direction, and this prescribed direction is the direction of or relative described inclined light shaft parallel with described optical axis.
According to the present invention,, therefore just can use the picture frame of fixing optical element to wait and constitute imaging lens unit because each optical element is overlapping and be bonded with each other.In addition, utilization is configured in along the side of the optical element in the same plane of the linearly extension of direction of or relative described inclined light shaft parallel with described optical axis, the imaging lens unit that can stably keep and fix.
In foregoing invention, the number of optical element preferably is at least 3.
According to the present invention, can aim at the optical axis of more optical element simply.In addition, because the side of a large amount of optical elements can form by once cutting off, therefore improved the efficient of cutting off.Its result can boost productivity, and is suitable for large-scale production.
In addition, imaging lens unit preferably adopts the side that makes above-mentioned each optical element structure with respect to the optical axis almost parallel.
According to the present invention,, can make easily and promptly because can form the side at an easy rate.
In foregoing invention, optical element can be one that constitutes in a plurality of optical elements of array of optical elements, and array of optical elements carries out two-dimensional arrangements with optical element and forms.
In foregoing invention, imaging lens unit is preferably by comprising a slice positive lens at least and constituting with the optical element below 10 of this positive lens in abutting connection with the negative lens of a slice at least of configuration.
According to foregoing invention, can carry out aberration correction by the positive lens of adjacency and the magnification of negative lens (パ ワ one) are made up.
In addition, because the overlapping number of optical element with magnification can not make eccentric error excessively accumulate, thereby can keep optical property well below 10.And then, further improving for making optical property, the number that preferably makes the optical element with magnification is more still less, and is better below 8.Preferably below 7.
Herein, so-called positive lens and negative lens are meant lens with positive amplification ratio and the lens with negative magnification respectively.
In foregoing invention, imaging lens unit preferably has the air interface below 10.
According to this invention, can reduce by caused ghost image of the reflected light of air interface or hot spot.Its result even reduce the degree that prevents reflectance coating and the number of plies be coated on optical element, also can obtain the good matter that resembles, thereby can reduce manufacturing cost not reducing under the situation that resembles matter.
And because the few more effect of air interface is remarkable more, so the number of air interface is preferred below 8.If the number of air interface is 6 with next better.
In foregoing invention, the processing of light absorption part is set on other face except the optical surface of optical element of imaging lens unit preferably.
According to this invention, owing to can suppress because ghost image or the hot spot that the reflected light of other face outside the optical surface of absorption eliminating optical element produces.The result can make and resemble matter and be improved.
In foregoing invention, imaging lens unit can have the optical lightscreening parts that engage with above-mentioned optical element, and these optical lightscreening parts have and the side of this optical element is configured in the side in the one side.
According to this invention, because optical lightscreening parts and the integrated formation of imaging lens unit in the function that can improve imaging lens unit, also can make its miniaturization.In addition,, can simplify technological process, boost productivity because the optical lightscreening parts can use the technology identical with other optical element to engage.
In foregoing invention, imaging lens unit can have the light-blocking member that engages with above-mentioned optical element, and this light-blocking member has and the side of this optical element is configured in the side in the one side.
According to this invention, because utilize light-blocking member, can suppress the ghost image that causes by outer light or the generation of hot spot, resemble matter and be improved so can make.In addition,, can simplify technological process, boost productivity because light-blocking member can use the technology identical with other optical element to engage.
According to a second aspect of the invention, provide a kind of camera head, have imaging lens unit and imaging apparatus, it is characterized in that, it has the imaging lens unit of the invention described above first aspect.
According to this invention, can obtain to have the camera head of the action effect of foregoing various imaging lens units.
In foregoing invention, camera head can adopt the structure that engages imaging apparatus on the optical element that constitutes the final face of above-mentioned imaging lens unit.
According to this invention,, therefore imaging lens unit can be engaged in imaging apparatus owing to there is not complicated assembly structure.Its result can reduce manufacturing cost.
In addition, can also improve the bearing accuracy of optical element and imaging apparatus.
In foregoing invention, the side that imaging apparatus preferably has with above-mentioned optical element is configured in the end face in the one side.
According to a third aspect of the invention we, a kind of manufacture method of image unit is provided, this image unit has a plurality of optical elements, it is characterized in that, a plurality of array of optical elements with described a plurality of optical elements that optical axis alignment arranges so that after described optical axis was consistent and overlapping state is bonded with each other, the direction along or relative described inclined light shaft parallel with described optical axis between described optical element was cut off.
According to a forth aspect of the invention, provide a kind of manufacture method of image unit, this image unit has a plurality of optical elements, it is characterized in that, prepares to arrange a plurality of array of optical elements that form by each optical element of a large amount of described a plurality of optical elements; With the optical axis alignment of described a plurality of optical elements, and with described a plurality of array of optical elements along the overlapping joint of described optical axis direction, between adjacent optical element, cut off along the direction of or relative described inclined light shaft parallel with described optical axis.
According to the present invention, carry out together because aim at the optical axis of a plurality of optical elements, can shorten the operation of position alignment significantly.In addition, because the position alignment of optical element and to engage be that state with bigger array of optical elements carries out, so operate and be more prone to, can improve its operability.And,, therefore can make small-sized imaging lens unit in a large number because be the array of optical elements that cuts off after engaging.
According to a fifth aspect of the invention, a kind of manufacture method of camera head is provided, it is characterized in that, by a plurality of array of optical elements with a plurality of optical elements that optical axis alignment arranges so that after described optical axis is consistent and overlapping state is bonded with each other, direction along or relative described inclined light shaft parallel with described optical axis between described optical element is cut off, make imaging lens unit, and imaging apparatus engages with the optical element of the final face that constitutes described imaging lens unit.
According to foregoing invention, can following manufacturing image unit: a plurality of imaging apparatuss are arranged on the wafer.On the other hand, a plurality of identical optical elements are arranged on the substrate (array of optical elements).With this array of optical elements so that the optical axis of each optical element is consistent and overlapping state engages.Then, its relative wafer carried out position alignment and engage, and then, along with the facing them and cut off of the linearly extension of direction of parallel direction of optical axis or relative inclined light shaft.Like this, because carry out the position alignment of a plurality of imaging apparatuss and a plurality of optical elements simultaneously, the position alignment operation is significantly simplified, and can boost productivity.In addition, can reduce manufacturing cost.
Description of drawings
Fig. 1 is the simplified diagram of the imaging lens unit of explanation the 1st embodiment of the present invention, wherein, Fig. 1 (a) is the fragmentary perspective view of imaging lens unit, Fig. 1 (b) is the A-A sectional view of Fig. 1 (a), and Fig. 1 (c) is the explanation synoptic diagram of the angle between the normal of effective range of the optical axis of optical surface of optical element and optical surface.
Fig. 2 is the fragmentary perspective view of an example of manufacture method of the imaging lens unit of explanation the 1st embodiment of the present invention.
Fig. 3 is the skeleton view and the B-B sectional view thereof of the 1st variation of explanation the 1st embodiment, and the concept map of optical axis direction section of an example that the manufacture method of this variation is described.
Fig. 4 is the sectional view along optical axis direction of the 2nd variation of explanation the 1st embodiment, and the concept map of optical axis direction section of an example that the manufacture method of this variation is described.
Fig. 5 is the sectional view along optical axis direction of the 3rd variation of explanation the 1st embodiment, and the concept map of optical axis direction section of an example that the manufacture method of this variation is described.
Fig. 6 is the sectional view along optical axis direction of the 4th variation of explanation the 1st embodiment, and the concept map of optical axis direction section of an example that the manufacture method of this variation is described.
Fig. 7 is the example key diagram of cut-out shape of the array of optical elements of the 1st embodiment of the present invention.
Fig. 8 is the index path of the 1st numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Fig. 9 is the aberration figure of the 1st numerical value embodiment.
Figure 10 is the optical axis direction sectional view of formation method of the airspace in the structure of explanation the 1st numerical value embodiment.
Figure 11 is the index path of the 2nd numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Figure 12 is the aberration figure of the 2nd numerical value embodiment.
Figure 13 is the index path of the 3rd numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Figure 14 is the aberration figure of the 3rd numerical value embodiment.
Figure 15 is the index path of the 4th numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Figure 16 is the aberration figure of the 4th numerical value embodiment.
Figure 17 is the index path of the 5th numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Figure 18 is the aberration figure of the 5th numerical value embodiment.
Figure 19 is the index path of the 6th numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Figure 20 is the aberration figure of the 6th numerical value embodiment.
Figure 21 is the index path of the 7th numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Figure 22 is the aberration figure of the 7th numerical value embodiment.
Figure 23 is the index path of the 8th numerical value embodiment of the imaging lens unit of the 1st embodiment of the present invention.
Figure 24 is the aberration figure of the 8th numerical value embodiment.
Figure 25 is the brief configuration schematic illustration of optical system of zoom lens of an example of the camera head of the 2nd embodiment of the present invention.
Figure 26 is that the major part in the camera head of other example of camera head of expression the 2nd embodiment of the present invention is the optical axis direction sectional view of the brief configuration of image unit.
Figure 27 is to use the cross sectional illustration figure of brief configuration of the capsule endoscope of this image unit.
Figure 28 is to use front view, side view and the sectional view of brief configuration of the portable terminal of this image unit.
Figure 29 is to use the perspective key diagram of brief configuration of the personal computer of this image unit.
Figure 30 is to use the side-looking key diagram of brief configuration of the surveillance camera of this image unit.
Figure 31 is to use the automobile mounted perspective key diagram of using the brief configuration of camera system of this image unit.
Embodiment
Below, with reference to accompanying drawing, the imaging lens unit and the camera head of the specific embodiment of the present invention described.
The 1st embodiment
At first, the imaging lens unit to the 1st embodiment of the present invention describes.Fig. 1 (a) is the fragmentary perspective view of the imaging lens unit 100 of explanation present embodiment.Fig. 1 (b) is the A-A sectional view of Fig. 1 (a).Fig. 1 (c) is the explanation synoptic diagram of the angle between the normal of effective range of the optical axis of optical surface of optical element and optical surface.
In addition, lens 2, optical light filter 3 and lens 4 have convex lens 2a, 2b respectively, implement optical filtering face 3a, 3b, concavees lens face 4a and the plane lens face 4b that filters and handle on the surface as optical surface.Therefore, lens the 1, the 2nd have the positive lens of positive amplification ratio, and lens 4 are the negative lenses with negative magnification.
In addition, in a side of the close lens 1 of flange portion 2d, be provided with the locating slot 2f that by groove formed chimeric with locator protrusions 1e, its number is identical with the number of locator protrusions 1e.And then, constitute the location division by these locator protrusionss 1e and locating slot 2f.Form locator protrusions 1e and locating slot 2f respectively, make that the edge is closely chimeric perpendicular to optical axis direction in the optical axis consistent location of lens 1 and lens 2.
In addition, the end along optical axis direction of locating slot 2f contacts with flange portion 1d.Thus, so that the state of airspace to be set between lens face 1b and lens face 2a, lens 1 and lens 2 are correctly located along optical axis direction.This airspace is sandwiched between the lens face 1b and lens face 2a with magnification, plays a role as the air lens with magnification.
Equally, in lens 3 one sides, lens 2 one sides, lens 4 one sides of flange portion 2d, and, be respectively equipped with locator protrusions 2e, locating slot 3f, locator protrusions 3e, locating slot 4f as the location division in optical light filter 3 one sides of flange portion 4d at flange portion 3d.Thereby these lens are positioned the optical axis alignment that makes them, and between each optical surface, suitable airspace is set.
In addition, in Fig. 1, for the ease of understanding, an example of the location division shape of having drawn large, but so long as along optical axis direction and along adjusting its position perpendicular to the direction of optical axis, any size and shape can.For example, to mutual chimeric shape, except that locator protrusions 1e shown in Fig. 1 (b) and locating slot 2f, also can use V-type projection and V-type groove, also available register pin and pilot hole, also available spherical protuberances and spherical recess.In addition, also can each chimeric reference field be in contact with one another position by having the projection of reference field along each orientation setting.
The joint of lens 1,2, optical light filter 3 and lens 4 can adopt suitable method.For example, it is bonding to adopt bonding agent such as UV hardening resin to carry out, or adopts method such as laser bonding.
Each optical element can adopt glass or the molded and shaped method manufacturing of synthetic resin.Particularly, realize more stable optical characteristics and miniaturization more, preferably utilize glass to make material in order to make optical element with magnification.This be because: glass has bigger refractive index, more excellent surface accuracy, and glass material has good homogeneity and temperature stability.
In addition, imaging lens unit 100 can followingly be made.At first, lens 1, lens 2, optical light filter 3 and lens 4 are made the array 101,102,103,104 (array of optical elements) of the two-dimensional lattice shape of arranging with uniform distances.At this moment, also form locator protrusions and locating slot.Secondly, make the consistent position alignment and the joint of carrying out of optical axis of each array.And then, as shown in Figure 2, cut off line 6 in this state lower edge, with cutter 5 parting tools such as grade it is cut off.In the case, as having formed flange side 1c, 2c, 3c and 4c along the otch that cuts off line 6.Thereby flange side 1c, 2c, 3c and 4c are configured in the same plane and (join with same plane).This same plane is exactly the plane along the linearly extension of optical axis direction.Though in the case of this example, this same plane parallel is in optical axis, and the difference according to cutting off method for processing also can be not parallel to optical axis sometimes.In addition, as required, also can after cut-out,, carry out surface working to each flange side 1c, 2c, 3c and 4c by processing such as grindings.
In addition, can be by two positions pilot hole 8a being set at least, insert this pilot hole with register pin 8b and carry out each array 101,102,103,104 in location perpendicular to the direction of optical axis.In addition, for example, also can adopt on to keep the manufacturing anchor clamps of each array 101,102,103,104 to position movably perpendicular to the direction of optical axis.
And in the imaging lens unit 100 of above-mentioned explanation, preferably by methods such as coating or evaporations, to the face except optical surface, that is flange portion 1d, 2d, 3d, 4d or flange side 1c, 2c, 3c and 4c implement the processing that light absorbing material is set.Particularly, also can be by fixedly carrying out this processing after pasting membraneous material with light absorption at volume on flange side 1c, 2c, 3c and the 4c.In the case, for example, shrink film's materials such as also available rubber, heat-shrink tube are fixed after covering.In addition, also can pass through cementing agent or alite paste etc., the noncontractile membraneous material of formation such as paper or synthetic resin volume is attached on flange side 1c, 2c, 3c and the 4c be fixed.
Secondly, the effect to the imaging lens unit of present embodiment is illustrated.
According to the imaging lens unit of present embodiment,, therefore, do not need to install and keep other parts such as picture frame of optical element because optical elements such as lens 1,2,4 and optical light filter 3 are to be located and engaged by the optical element that adjoins each other along optical axis direction.Its result can reduce the part number, reduces manufacturing cost, also has can realize in light weight and advantage such as miniaturization.
In addition, according to present embodiment,,, the airspace is set accurately so can reduce the part accumulated error because the location division of optical axis direction is made as one with flange portion 1d, the 2d, 3d, the 4d that form the optical surface peripheral part.And, the less joint lens face of plane of refraction with air interface and refringence is compared, magnification is bigger, therefore by strengthening the airspace, compare with the situation (comprising the situation that does not have the airspace) that the airspace is narrow and small, use the optical element of equal number can obtain higher performance.
In addition, because present embodiment is provided with flange portion 1d, 2d, 3d, 4d at the peripheral part of the optical surface of optical element, therefore can on flange portion 1d, 2d, 3d, 4d, form the location division.In addition, can also utilize this flange portion as the composition surface.Therefore, needn't worry stained optical surface, have and improve the advantage of making efficient.
In addition, on the peripheral part of flange portion 1d, 2d, 3d, 4d, be formed with jut laterally.When with other optical element when overlapping, this jut becomes the shape that forms the gap along optical axis direction.Like this, just can utilize this gap as the portion of overflowing of cementing agent or the smear metal discharge portion when cutting off.
As mentioned above, the imaging lens unit 100 of present embodiment has on flange portion 1d, the 2d of the peripheral part of each optical element, 3d, 4d and approximately parallel with optical axis faces neat flange side 1c, 2c, 3c and 4c by quadrangular.Therefore, the one side of these flange faces can be used as the installed surface use.In addition, as mentioned above, the imaging lens unit 100 of present embodiment cuts off the overlapping joint of array of optical elements afterwards and makes with cutter 5.If utilize such method for making, can put together the array of optical elements that includes a large amount of optical elements and position and engage to fix its position relation.Therefore, this compares with the situation that optical element is positioned one by one, engages one by one, has the advantage that can boost productivity greatly.When each optical element was very little, such advantage was more remarkable, was well suited for a large amount of productions of small-sized image pickup lens unit.
In addition, in the above-mentioned explanation, be that 3 situation is illustrated to optical element with magnification, certainly, also can adopt by increasing the structure that the sheet number improves optical property.At this moment, owing to comprise each 1 at least of positive lens and negative lens respectively, can carry out aberration correction.
In addition, has the superimposed sheets number of optical element of magnification preferably below 10.If constitute like this, can prevent the excessive accumulation of the eccentric error that the mismachining tolerance of location division or the rigging error of optical element etc. form.In addition, the superimposed sheets of optical element with magnification is several more better below 8, and is best below 7.Can synthetically determine the superimposed sheets number of optical element from the necessary performance of imaging lens unit 100 and the relation of cost of manufacture.
In addition, in the above-mentioned explanation, the size of airspace is had no particular limits, but preferably the size of airspace is set a limit.If the airspace keeps suitably size, the length of the optical axis direction of location division will shorten, and makes high-precision dimensioned become easy.Its result, the eccentric error in the time of can preventing to assemble.
Specifically, if TD be defined as face that above-mentioned optical element engages the optical system that constitutes from the 1st to final face at interval (total length of optical system), SD be defined as the length summation (airspace and) of the airspace on the optical axis, the length maximal value (maximum airspace) that MT is defined as the airspace on the optical axis, then imaging lens unit preferably satisfies following formula simultaneously.
ST/TD＜0.7 (1)
MT/TD＜0.5 (2)
When surpassing above-mentioned various going up in limited time, because the total length of airspace or optical system is elongated, off-centre also increases.Its result is difficult to obtain enough optical properties.
In addition, for assembling, the machining precision that improves optical element better, replacement formula (1), (2), preferred satisfied following formula (3), (4).
ST/TD＜0.6 (3)
MT/TD＜0.4 (4)
For assembling, the machining precision that further improves optical element, replacement formula (1), (2), preferred satisfied following formula (5), (6).
ST/TD＜0.5 (5)
MT/TD＜0.3 (6)
In addition, in the above-mentioned explanation, be that example is illustrated with 8 to the number of the air interface of optical element, but also can adopt the number of air interface is set limit.Can be reduced in incidental scattered light on the air interface like this.Its result can prevent the generation of ghost image or hot spot, improves to resemble matter.In addition, also can cancel or reduce and to implement the optical surface that anti-reflection coating is handled, thereby can reduce cost.
For this reason, preferably the number of air interface is limited in below 10.Be further to reduce scattered light, the number of air interface preferably is less than 8, is less than 6 best.
In addition, in the above-mentioned explanation, the example of the shape of optical surface not being set special restriction is illustrated, but the curve form that preferably limits optical element makes its inclination more mild.Thus, contact-type shape measuring apparatus such as utilizing the shape roughness detector is measured and become possibility.By using the contact-type shape measuring apparatus, can directly learn shape error.Therefore, needn't measure optical characteristics, whether good with regard to the decidable part.In addition, by measurement result is fed back in the manufacture process, can improve manufacture process.In addition, but the shape of rapid test optical surface also.Its result has the advantage of the manufacturing efficient of the optical surface with magnification that can improve present embodiment.
Specifically, shown in Fig. 1 (c), the 1st, the normal of the effective range of optical surface 2, the 3rd, the optical axis of optical surface 2, the 4th, be used to represent the boost line of effective range.When the angle between the normal 1 of the effective range of the optical axis 3 of each optical surface 2 that tiltangle is defined as optical element and optical surface 2, the maximal value of tiltangle of each optical surface that preferably makes optical element is less than 60 degree.In addition, if the maximal value of tiltangle less than 55 degree, even then because under the very big situation of shape error, also can improve the mensuration precision, becomes easily the making of high-precision optical surface, therefore more desirable.And then, if the maximal value of tiltangle is then desirable less than 50 degree.
Secondly, the some variation to present embodiment describe.These explanations all are to be that carry out at the center with the difference with the embodiment of above-mentioned explanation.In addition, in the explanation of variation, adopt same-sign, omit its explanation for explanation common means with above-mentioned the 1st embodiment.
At first, the 1st variation is described.Fig. 3 (a) is the perspective key diagram of the 1st variation of explanation present embodiment.Fig. 3 (b) is the B-B sectional view of Fig. 3 (a).Fig. 3 (c), (d) are the concept maps of optical axis direction section of an example of the manufacture method of explanation the 1st variation.
Shown in Fig. 3 (a) and (b), the imaging lens unit 110 of this variation has lens 11,12,13.The optical axis of each lens all is consistent, and utilizes flange portion 11d, 12d, the 13d that extends along perpendicular to optical axis direction, overlapping in order and joint.Different with the imaging lens unit 100 of Fig. 1, locator protrusions or locating slot are not set on flange portion 11d, 12d, 13d.The plan view of these flange portion is square substantially, flange side 11c, 12c, 13c (side) with 4 planar registration substantially parallel with optical axis separately.Shown in Fig. 3 (a), be configured in unidirectional flange side 11c, 12c, 13c are disposed at respectively along in the same plane of optical axis direction.
Lens 11 are the positive lenss with convex lens 11a and concavees lens face 11b.Lens 12 are the positive lenss with convex lens 12a, 12b.Lens 13 are the negative lenses with concavees lens face 13a and plane lens face 13b.
The flange portion 12d of the flange portion 11d of lens face 11b side and lens face 12a side is in contact with one another.But,, therefore between lens face 11b, 12a, form the airspace because lens face 11b is different with the radius-of-curvature of lens face 12a.
In addition, lens face 12b has identical radius-of-curvature with lens face 13a, engages with cementing agent by bonding between them.At this moment, the magnification of supposing the whole optical system of imaging lens unit 110 is φ
A, then the magnification φ of lens face 12b, the 13a on composition surface satisfies
0＜|φ/φ
A|＜0.5 (7)
Herein, | φ/φ
A| expression φ/φ
AAbsolute value.
This variation is different with the situation of imaging lens unit 100, does not have the location division perpendicular to each optical element optical axis direction.Therefore,, can come each optical element of clamping by suitable anchor clamps, its position that moves to the optical axis alignment that makes each optical element is carried out perpendicular to the location of optical axis direction when when single lens 11,12,13 are made imaging lens unit 110.Perhaps, make apart from high precision is consistent to optical axis by flange side 11c, 12c, the 13c that makes each optical element.Also can calibrate flange side 11c, 12c, 13c by suitable reference field.In addition, shown in Fig. 3 (c), (d), can not begin to make from discrete component yet, and make the array 111,112,113 (array of optical elements) arranged lens face 11a, 11b, 12a, 12b, 13a, 13b, move each array of optical elements then and position, the manufacture method of cutting off after again it being engaged.In addition, Fig. 3 (c), (d) are the concept maps of the manufacture process when this method is applied to this variation.The method that engages or cut off can be used the same method that illustrated in the 1st embodiment.
Have 3 optical elements according to this variation, wherein 1 group is made to the joint lens that optical surface is engaged.For this reason, by suitably selecting the refractive index of the optical element that engages respectively, can proofread and correct chromatic aberration.Its result can make the very low high performance imaging lens unit of chromatic aberration.
In addition,, can make the radius-of-curvature on composition surface needn't be too small, therefore the handling ease on composition surface be carried out because the magnification φ on this composition surface satisfies formula (7).Its result can make the optical surface as the composition surface at an easy rate.
In addition, this variation is to engage lens to have only 1 group example, but in order further to improve chromatic aberration, also can increase the number on composition surface.In the case, the φ of formula (7) can regard the maximal value of the magnification on these composition surfaces as.
In addition,, radius-of-curvature is increased, preferably replaces formula (7), satisfy following formula in order further to improve the processability on composition surface:
0＜|φ/φ
A|＜0.4 (8)
In order further to improve the processability on composition surface, preferably replace formula (7) to satisfy following formula:
0＜|φ/φ
A|＜0.3 (9)
Secondly, the 2nd variation is described.Fig. 4 (a) is the sectional view along optical axis direction of the 2nd variation of explanation present embodiment.Fig. 4 (b), (c) are the cross-sectional conceptual figure along optical axis direction of an example of the manufacture method of explanation the 2nd variation.
Shown in Fig. 4 (a), the imaging lens unit 120 of this variation has 4 lens 21,22,24,13 as optical element, between lens 22,24, is provided with the aperture diaphragm 23 (hold assembly) that light beam is adjusted into the regulation shape.Each optical element has flange side 21c, 22c, 24c and 13c (side) respectively.Flange side 21c, 22c, 24c and 13c along same direction configuration are disposed in the same plane along optical axis direction.
The end face that the plane that aperture diaphragm 23 has is that the surface is made of the synthetic resin with light absorption, metal etc., arranged with flange side 21c, 22c, the 24c and the 13c of optical element aligns.
Locator protrusions 22e, 24e engage with the state of mutually opposed clamping hole footpath diaphragm 23.And, between lens face 22b, 24a, form the airspace.
Shown in Fig. 4 (b), (c), such imaging lens unit 120 can followingly be made.It is overlapping and engages afterwards and cut off promptly lens face 21a, 21b, 22a, 22b, 24a and 24b to be arranged the array 121,122,124 (array of optical elements) that forms and array 113.At this moment, engage, after cut-out, form aperture diaphragm 23 by the aperture diaphragm sheet 123 that is provided with the aperture portion identical with each optical element arrangement pitches is clipped between the array 122,124.In addition, the material as aperture diaphragm sheet 123 can use synthetic resin or metal.
According to this variation, utilize relative locator protrusions 22e, 24e, can form the airspace of the regulation between lens face 22b and lens face 24b.In addition, because engage in flange portion, the shape in the time of can making optical element integrated is quite succinct.Its result has improved the mouldability of optical element, has the advantage that can guarantee formed precision and throughput rate is improved.
In addition, according to this variation, can be integrated into aperture diaphragm 23 in the imaging lens unit 120.At this moment, if utilize aperture diaphragm sheet 123 to make, because its location all can carry out according to the operation identical with array of optical elements with engaging, can be easily and the advantage of assembling accurately so have.
Secondly, the 3rd variation is described.Fig. 5 (a) is the optical axis direction sectional view of the 3rd variation of explanation present embodiment.Fig. 5 (b), (c) are the optical axis direction cross-sectional conceptual figure of an example of the manufacture method of explanation the 3rd variation.
Shown in Fig. 5 (a), the imaging lens unit 130 of this variation has the lens 21,22,24,13 with the 2nd variation same structure, and the flange side 21c, 22c, 24c and the 13c that dispose along same direction are disposed in the same plane along optical axis direction.
Wherein, on the lens face 21b of lens 21, be formed with aperture diaphragm coating 31 as photomask.By this aperture diaphragm coating 31, the light beam of prescribed level is incided lens 21.In addition, on the lens face 13b of lens 13, be formed with hot spot and prevent coating 32 as photomask.Prevent coating 32 by this hot spot, can prevent from effective lens range part incident ray in addition.That is hot spot prevents that coating 32 has hot spot and prevents function.
Aperture diaphragm coating 31, hot spot prevent that coating 32 can be by applying light absorbing material or evaporation waits and forms.When utilizing array of optical elements to make, shown in Fig. 5 (b), (c), after formation aperture diaphragm coating 31 and hot spot prevent coating 32 on each array 121,113 respectively, overlapping and joint with it.
According to this variation, owing to aperture diaphragm coating 31, hot spot prevent that coating 32 is respectively formed on each optical element, just there is no need with other parts diaphragm to be set.Therefore, when engaging, save the trouble that positions, can also reduce the number of part simultaneously.Its result can boost productivity and reduces manufacturing cost.
Secondly, the 4th variation is described.Fig. 6 (a) is the sectional view of optical axis direction of the 4th variation of explanation present embodiment.Fig. 6 (b), Fig. 6 (c) are the concept maps of optical axis direction section of an example of the manufacture method of explanation the 4th variation.
Shown in Fig. 6 (a), the imaging lens unit 140 of this variation has the lens 21,22,24,13 with the 2nd variation same structure, and the flange side 21c, 22c, 24c and the 13c that dispose along same direction are disposed in the same level along optical axis direction.
In this variation, on lens 21, engage light-blocking member 41.
Light-blocking member 41 is made of the synthetic resin etc. that surface at least has light absorption.Light-blocking member 41 is the wall bodies with inclined inner surface 41a.Inside surface 41a delimit effective lens range of lens 21, on one side and extend along optical axis direction hole enlargement on one side.According to such structure, light-blocking member 41 has the function of adjusting the outer light that incides lens 21.Outer peripheral face 41c aligns with flange side 21c, 22c, 24c and 13c.
In this variation, also adopt to make earlier to make light-blocking member 41 form the shading array component 141 of array-like, then with its with array of optical elements overlapping and engage after the manufacture method cut off.
According to this variation, because light-blocking member 41 engages with each optical element and is one, so can be easily and produce outer light at an easy rate and be difficult to incident, resemble the imaging lens unit that matter is improved.
And, in the 1st embodiment of above-mentioned explanation, be that to be aligned to section be that the example of foursquare quadrangular face is illustrated substantially to the side of optical element, but be not limited to such prismatic surface.Also can be according to the treatment situation of the reason in the manufacturing of imaging lens unit or assembling, carrying etc., and adopt other different shape.
For example, with regard to manufacturing, the processing of linearity is easy to.Therefore, particularly when when array of optical elements cuts,,, highly efficient in productivity if adopt this job operation because process number tails off.In addition, add man-hour, the profile of imaging lens unit must not be a square cross-section, for example, shown in Fig. 7 (a), can be that section is the quadrangular face of rhombus yet.At this moment, different with the situation of square cross-section, therefore when can the most thickly arrange optical surface 40 with cutting off,, have and make the advantage that optical surface can the high precision moulding because the peripheral part of optical surface 40 does not contact each other.In addition, Fig. 7 (b) is depicted as the example of hexagonal cross-section.In the case, because flange portion 41 is very little, has the advantage that can make lightweight imaging lens unit.
In addition, particularly,,, therefore also can shown in Fig. 7 (c), cut by circular section because can easily form plane, curved surface along the linearly extension of optical axis direction if adopt cutting-off methods such as laser or jet water course.When arrangement plane was used as the supporting reference field of assembling, there was not directivity in the imaging lens unit that is arranged on such barrel surface around optical axis, thereby made assembling become very easy.
In addition, in the above-mentioned explanation, the example that the side of optical element is roughly parallel to optical axis is illustrated, but this side also can be with respect to inclined light shaft.For example, can be the inclination that the mismachining tolerance when cutting off produces, also can be the inclination of setting in accordance with regulations conical surface alignment.
In addition, in the above-mentioned explanation, each optical element is illustrated as the example that the side has the flange side 1c that is arranged on flange portion 1d, 2d, 3d, 4d, 11d, 12d, 13d, 21d, 22d, the 24d, 2c, 3c, 4c, 11c, 12c, 13c, 21c, 22c, 24c, 152c, but the side of optical element also can be formed by the outer peripheral face of optical element.
In addition, in the above-mentioned explanation,, the example of the side alignment of optical element has been described as the example that is suitable for making.But if just constitute imaging lens unit this purpose of omitting the picture frame parts in order to reach, the side of optical element can not line up yet.This is because each optical element can engage with the face of the optical axis direction of flange portion 1d, 2d, 3d, 4d, 11d, 12d, 13d, 21d, 22d, 24d.
In addition, in the above-mentioned explanation, as array of optical elements, the example of two-dimensional arrangements being illustrated with diagram, can certainly be that 1 dimension is arranged.
In addition, when cutting manufacturing from array of optical elements, also can cut out a plurality of optical elements, obtain a plurality of imaging lens units with parallel optical axis along orientation.At this moment, the optical surface kind of a plurality of optical elements of orientation also can be different.
Below, the concrete numerical value embodiment of the optical system of the imaging lens unit that can be used for above-mentioned the 1st embodiment that has illustrated is described.
And, below, each embodiment is identical, represents the full field angle in diagonal angle with symbol " w ", and F represents effective f-number index (F number), and So represents that object distance, IH represent image height.In addition, expression ST/TD, MT/TD, tiltangle, | φ/φ
A| amount, all identical with used title, definition in the above-mentioned explanation.
In addition, in the table of numeric data described later, r represents radius-of-curvature, d presentation surface interval, n
dExpression refractive index, υ
dThe expression Abbe number.r
i, d
i, n
i, υ
i(i is an integer) is radius-of-curvature, face interval, refractive index, Abbe number.In each index path described later, show r with the numeric data table
i, d
i, n
iCorresponding relation.
Shown in Figure 8 is the index path of the 1st numerical value embodiment.Fig. 9 is the aberration figure of present embodiment.Fig. 9 (a) represents spherical aberration (mm of unit), represents relative aperture with the longitudinal axis with transverse axis, the aberration figure that the spherical aberration that wavelength 656.27nm, 587.56nm, 546.07nm, 486.13nm, 435.84nm are calculated is represented.Fig. 9 (b) is that transverse axis is that astigmatism (unit is mm), the longitudinal axis are the aberration figure of field angle (unit for °).Δ M represents the side-play amount of meridianal image surface, and Δ S represents the radially side-play amount of image planes.Fig. 9 (c) is that transverse axis is that aberrance (% of unit), the longitudinal axis are the aberration figure of field angle (unit for °).
The structure of present embodiment is according to the order that begins from object side, to have the 1st lens 51 of positive amplification ratio, the 2nd lens 52 of positive amplification ratio, the 3rd lens 53 and the filter part 54,55 of negative magnification.Between the 1st lens 51 and the 2nd lens 52, be provided with the airspace.The optical surface of the 2nd lens 52 and the 3rd lens 53 is bonded with each other.In addition, though not shown in the drawings, on the face of the imaging side of the 1st lens 51, be formed with diaphragm with vapour deposition method.
For the airspace between the 1st lens 51 and the 2nd lens 52 is set, can be shown in Figure 10 (a), on the 1st lens 51 and the 2nd lens 52, locator protrusions 51a, 52a are set respectively, contact along optical axis direction, also can shown in Figure 10 (b), between the 1st lens 51 and the 2nd lens 52, sandwich a spacer 56 (hold assembly).
In addition, in the following description, the airspace of other numerical value embodiment can form with above-mentioned any method.
In the present embodiment, make object distance So=960mm, be set at focal length.The full field angle ω in diagonal angle=40 °, effective f-number index are F2.8, image height IH=0.924mm.
In addition, air interface is 6, ST/TD=0.42, MT/TD=0.20, tiltangle=33 °, | φ/φ
A|=0.08.
By between the 1st lens 51 and the 2nd lens 52, the airspace being set, carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝1.64 d
1＝1.11 n
1＝1.8061 υ
1＝40.9
2 r
2＝1.69 d
2＝0.87
3 r
3＝2.38 d
3＝0.72 n
2＝1.8061 υ
2＝40.9
4 r
4＝-2.38 d
4＝0.40 n
3＝1.6889 υ
3＝31.1
5 r
5＝∞ d
5＝0.1?8
6 r
6＝∞ d
6＝0.50 n
4＝1.5163 υ
4＝64.1
7 r
7＝∞ d
7＝0.50 n
5＝1.5163 υ
5＝64.1
8 r
8＝∞ d
8＝0.03
9 r
9=∞ (imaging surface)
As can be seen from Figure 9, the imaging lens unit of present embodiment has the good aberration characteristic in the visible light territory.
Shown in Figure 11 is the index path of the 2nd numerical value embodiment.Figure 12 is the aberration figure of present embodiment.Because of the technique of painting of Figure 12 (a) and (b), (c) is identical with the figure that Fig. 9 (a) and (b), (c) illustrate respectively, therefore omit to its etc. explanation.
The structure of present embodiment is that according to the order that begins from object side, setting has the 1st lens 57 of positive amplification ratio, the 2nd lens 58 with positive amplification ratio, the 3rd lens 59 with negative magnification and filter part 54,55.Between the 1st lens 57 and the 2nd lens 58, be provided with the airspace.The optical surface of the 2nd lens 58 and the 3rd lens 59 engages.In addition, though not shown, on the face of object one side of the 1st lens 57, be formed with diaphragm with vapour deposition method.
In the present embodiment, make object distance So=960mm, be set at focal length.The full field angle ω in diagonal angle=40 °, effective f-number index are F2.8, image height IH=0.924mm.
In addition, air interface is 6, ST/TD=0.14, MT/TD=0.09, tiltangle=37 °, | φ/φ
A|=0.09.
By between the 1st lens 57 and the 2nd lens 58, being provided with the airspace, carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝1.54 d
1＝1.33 n
1＝1.8061 υ
1＝40.9
2 r
2＝1.20 d
2＝0.35
3 r
3＝1.96 d
3＝0.75 n
2＝1.8061 υ
2＝40.9
4 r
4＝-1.96 d
4＝0.40 n
3＝1.6889 υ
3＝31.1
5 r
5＝∞ d
5＝0.17
6 r
6＝∞ d
6＝0.50 n
4＝1.5163 υ
4＝64.1
7 r
7＝∞ d
7＝0.50 n
5＝1.5163 υ
5＝64.1
8 r
8＝∞ d
8＝0.03
9 r
9=∞ (imaging surface)
As can be seen from Figure 12, the imaging lens unit of present embodiment has the good aberration characteristic in the visible light territory.
Shown in Figure 13 is the index path of the 3rd numerical value embodiment.Figure 14 is the aberration figure of present embodiment.Because of the technique of painting of Figure 14 (a) and (b), (c) is identical with the figure that Fig. 9 (a) and (b), (c) illustrate respectively, therefore omit to its etc. explanation.
The structure of present embodiment is according to the order that begins from object side, to be provided with the 1st lens 60 of negative magnification, the 2nd lens 61 with positive amplification ratio, the 3rd lens 62 with positive amplification ratio, the 4th lens 63 with negative magnification and filter part 54,55.The 1st lens 60 and the 2nd lens 61, and the optical surface of the 3rd lens 62 and the 4th lens 63 engages respectively.Between the 2nd lens 61 and the 3rd lens 62, be provided with the airspace.In addition, though not shown, on the face of the imaging side of the 1st lens 60, be formed with diaphragm with vapour deposition method.
In the present embodiment, object distance So=10mm, the full field angle ω in diagonal angle=90 °, effective f-number index are F3.0, image height IH=0.924mm.
In addition, air interface is 6, ST/TD=0.07, MT/TD=0.04, tiltangle=46 °, | φ/φ
A|=0.07.
By between the 2nd lens 61 and the 3rd lens 62, the airspace being set, carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝-1.30 d
1＝0.71 n
1＝1.6889 υ
1＝31.1
2 r
2＝3.75 d
2＝1.08 n
2＝1.8061 υ
2＝40.9
3 r
3＝-1.57 d
3＝0.15
4 r
4＝1.67 d
4＝1.22 n
3＝1.5831 υ
3＝59.4
5 r
5＝-1.18 d
5＝0.81 n
4＝1.6889 υ
4＝31.1
6 r
6＝∞ d
6＝0.19
7 r
7＝∞ d
7＝0.50 n
5＝1.5163 υ
5＝64.1
8 r
8＝∞ d
8＝0.50 n
6＝1.5163 υ
6＝64.1
9 r
9＝∞ d
9＝0.03
10 r
10=∞ (imaging surface)
As can be seen from Figure 14, the imaging lens unit of present embodiment has the good aberration characteristic in the visible light territory.Particularly, observe Figure 14 (a) as can be known, owing to use 2 set of bond lens, compare with the 1st, 2 embodiment, chromatic aberration is proofreaied and correct well.And then shown in Figure 14 (b), its astigmatism has also obtained fabulous correction.
Shown in Figure 15 is the index path of the 4th numerical value embodiment.Figure 16 is the aberration figure of present embodiment.The figure that illustrates with Fig. 9 (a) and (b), (c) respectively because of Figure 16 (a) and (b), (c) draws by same procedure, therefore omit to its etc. explanation.
The structure of present embodiment is, according to the order that begins from object side, setting has the 1st lens 65 of negative magnification, the 2nd lens 66 with positive amplification ratio, the 3rd lens 67 with positive amplification ratio, the 4th lens 68 with negative magnification and filter part 54,55.The 1st lens 65 and the 2nd lens 66, and the optical surface of the 3rd lens 67 and the 4th lens 68 engages respectively.Between the 2nd lens 66 and the 3rd lens 67, be provided with the airspace.In addition, not shown, on the face of object one side of the 1st lens 65, be formed with diaphragm with vapour deposition method.
In the present embodiment, object distance So=10mm, the full field angle ω in diagonal angle=90 °, effective f-number index are F3.0, image height IH=0.924mm.
In addition, air interface is 4, ST/TD=0.09, MT/TD=0.04, tiltangle=45 °, | φ/φ
A|=0.04.
Owing between the 2nd lens 66 and the 3rd lens 67, be provided with the airspace, therefore carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝-1.11 d
1＝0.60 n
1＝1.6889 υ
1＝31.1
2 r
2＝7.95 d
2＝0.77 n
2＝1.8061 υ
2＝40.9
3 r
3＝-1.24 d
3＝0.20
4 r
4＝1.87 d
4＝1.19 n
3＝1.5831 υ
3＝59.4
5 r
5＝-2.18 d
5＝0.60 n
4＝1.6889 υ
4＝31.1
6 r
6＝∞ d
6＝0.18
7 r
7＝∞ d
7＝0.50 n
5＝1.5163 υ
5＝64.1
8 r
8＝∞ d
8＝0.50 n
6＝1.5163 υ
6＝64.1
9 r
9＝∞ d
9＝0.03
10 r
10=∞ (imaging surface)
As can be seen from Figure 16, the imaging lens unit of present embodiment has the good aberration characteristic in the visible light territory.Particularly, observe Figure 16 (a) as can be known, owing to use 2 set of bond lens, compare with the 1st, 2 embodiment, chromatic aberration is proofreaied and correct well.And then shown in Figure 16 (b), its astigmatism has also obtained fabulous correction.
Embodiment 5
Shown in Figure 17 is the index path of the 5th numerical value embodiment.Figure 18 is the aberration figure of present embodiment.The figure that illustrates with Fig. 9 (a) and (b), (c) respectively because of Figure 18 (a) and (b), (c) draws by same procedure, therefore omit with its etc. explanation.
The structure of present embodiment is according to the order that begins from object side, to be provided with the 1st mirror 69 of negative magnification, the 2nd lens 70 with positive amplification ratio, the 3rd lens 71 with positive amplification ratio, the 4th lens 72 with negative magnification and filter part 54,55.The 1st lens 69 and the 2nd lens 70, and the optical surface of the 3rd lens 71 and the 4th lens 72 is bonded with each other.Between the 2nd lens 70 and the 3rd lens 71, be provided with the airspace.In addition, though not shown, on the face of object one side of the 1st lens 69, be formed with diaphragm with vapour deposition method.
In the present embodiment, make object distance So=10mm, the full field angle ω in diagonal angle=90 °, effective f-number index are F3.0, image height IH=0.924mm.
In addition, air interface is 6, ST/TD=0.07, MT/TD=0.03, pitch angle 0=41 °, | φ/φ
A|=0.06.
By between the 2nd lens 70 and the 3rd lens 71, the airspace being set, carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝-1.32 d
1＝0.70 n
1＝1.6889 υ
1＝31.1
2 r
2＝∞ d
2＝1.02 n
2＝1.8061 υ
2＝40.9
3 r
3＝-1.46 d
3＝0.15
4 r
4＝1.74 d
4＝0.93 n
3＝1.5831 υ
3＝59.4
5 r
5＝-1.50 d
5＝1.15 n
4＝1.6889 υ
4＝31.1
6 r
6＝∞ d
6＝0.16
7 r
7＝∞ d
7＝0.50 n
5＝1.5163 υ
5＝64.1
8 r
8＝∞ d
8＝0.50 n
6＝1.5163 υ
6＝64.1
9 r
9＝∞ d
9＝0.03
10 r
10=∞ (imaging surface)
As can be seen from Figure 18, the imaging lens unit of present embodiment has the good aberration characteristic in the visible light territory.Particularly, observe Figure 18 (a) as can be known, owing to use 2 set of bond lens, compare with the 1st, 2 embodiment, chromatic aberration is proofreaied and correct well.And then shown in Figure 18 (b), its astigmatism has also obtained fabulous correction.
Shown in Figure 19 is the index path of the 6th numerical value embodiment.Figure 20 is the aberration figure of present embodiment.The figure that illustrates with Fig. 9 (a) and (b), (c) respectively because of Figure 20 (a) and (b), (c) draws by same procedure, therefore omit to its etc. explanation.
The structure of present embodiment is according to the order that begins from object side, to be provided with the 1st lens 73 of positive amplification ratio, the 2nd lens 74 with positive amplification ratio, the 3rd lens 75 with negative magnification and filter part 54,55.The optical surface of the 2nd lens 74 and the 3rd lens 75 is bonded with each other.Be provided with the airspace at the 1st lens 73 and 74 on the 2nd lens.In addition, not shown, on the face of object one side of the 1st lens 73, be formed with diaphragm with vapour deposition method.
The 3rd lens 75 of embodiment use polycarbonate resin.
In the present embodiment, object distance So=960mm was set at focal length.The full field angle ω in diagonal angle=40 °, effective f-number index are F2.8, image height IH=0.924mm.
In addition, air interface is 6, ST/TD=0.14, MT/TD=0.09, tiltangle=38 °, | φ/φ
A|=0.20.
By between the 1st lens 73 and the 3rd lens 74, the airspace being set, carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝1.53 d
1＝1.340 n
1＝1.8061 υ
1＝40.9
2 r
2＝1.15 d
2＝0.35
3 r
3＝2.07 d
3＝0.77 n
2＝1.8061 υ
3＝40.9
4 r
4＝-1.88 d
4＝0.40 n
3＝1.5839 υ
3＝30.2
5 r
5＝∞ d
5＝0.17
6 r
6＝∞ d
6＝0.50 n
4＝1.5163 υ
4＝64.1
7 r
7＝∞ d
7＝0.50 n
5＝1.5163 υ
5＝64.1
8 r
8＝∞ d
8＝0.03
9 r
9=∞ (imaging surface)
As can be seen from Figure 20, although the synthetic resin lens that has adopted the lower polycarbonate resin of refractive index to become, the imaging lens unit of present embodiment also has the good aberration characteristic in the visible light territory.At present embodiment, because the lens that use the polycarbonate resin of synthetic resin to become, can produce cheap lens, therefore has the advantage that can obtain low-cost imaging lens unit, when using molding synthetic resin, also have following advantage, promptly can easily be provided for forming the locator protrusions of airspace.
Shown in Figure 21 is the index path of the 7th numerical value embodiment.Figure 22 is the aberration figure of present embodiment.The figure that illustrates with Fig. 9 (a) and (b), (c) respectively because of Figure 22 (a) and (b), (c) draws by same procedure, therefore omit to its etc. explanation.
The structure of present embodiment is according to the order that begins from object side, to be provided with the 1st lens 76 of negative magnification, the 2nd lens 77 with positive amplification ratio, the 3rd lens 78 with positive amplification ratio, the 4th lens 79 with negative magnification and filter part 54,55.The 1st lens 76 and the 2nd lens 77, and the optical surface of the 3rd lens 78 and the 4th lens 79 engages respectively.Be provided with the airspace at the 2nd lens 77 and 78 on the 3rd lens.In addition, though not shown, on the face of the imaging side of the 1st lens 76, be formed with diaphragm with vapour deposition method.
In the present embodiment, the 3rd lens 78 use ZEONEX (registered trademark) synthetic resin, and the 4th lens 79 use polycarbonate resin.
In the present embodiment, object distance So=10mm, the full field angle ω in diagonal angle=90 °, effective f-number index are F3.0, image height IH=0.924mm.
In addition, air interface is 6, ST/TD=0.07, MT/TD=0.03, tiltangle=46 °, | φ/φ
A|=0.20.
By between the 2nd lens 77 and the 3rd lens 78, the airspace being set, carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝-1.35 d
1＝0.78 n
1＝1.6889 υ
1＝31.1
2 r
2＝∞ d
2＝1.02 n
2＝1.8061 υ
2＝40.9
3 r
3＝-1.49 d
3＝0.1?5
4 r
4＝1.72 d
4＝1.19 n
3＝1.5254 υ
3＝56.2
5 r
5＝-1.24 d
5＝0.85 n
4＝1.5839 υ
4＝30.2
6 r
6＝∞ d
6＝0.16
7 r
7＝∞ d
7＝0.50 n
5＝1.5163 υ
5＝64.1
8 r
8＝∞ d
8＝0.50 n
6＝1.5163 υ
6＝64.1
9 r
9＝∞ d
9＝0.03
10 r
10=∞ (imaging surface)
As can be seen from Figure 22, although used 2 lower synthetic resin lens of refractive index to constitute, the imaging lens unit of present embodiment also has the good aberration characteristic in the visible light territory.Particularly, observe Figure 22 (a) as can be known, owing to use 2 set of bond lens, compare with the 1st, 2 embodiment, chromatic aberration is proofreaied and correct well.
According to present embodiment, adopted cheap synthetic resin lens owing in 4, there are 2, therefore have the advantage that can constitute cheap imaging lens unit.
Shown in Figure 23 is the index path of the 8th numerical value embodiment.Figure 24 is the aberration figure of present embodiment.The figure that illustrates with Fig. 9 (a) and (b), (c) respectively because of Figure 24 (a) and (b), (c) draws by same procedure, therefore omit to its etc. explanation.Wherein, among Figure 24 (a), more approaching because of the data of various wavelength, therefore a result to wavelength 656.27nm, 587.56nm, 486.13nm illustrates.
The structure of present embodiment is, according to the order that begins from object side, the 1st lens 80, parallel flat 81, the 2nd lens 82 with negative magnification, the 3rd lens 83 with positive amplification ratio with negative magnification are set, have the 4th lens 84 of negative magnification and have the 5th lens 85 of positive amplification ratio.The optical surface of the 2nd lens the 82, the 3rd lens the 83, the 4th lens 84 and the 5th lens 85 engages respectively.Concave surface (r at the 1st lens 80
2) and the face (ra) of object one side of parallel flat 81 between be formed with the airspace.In addition, though not shown, on the face of the imaging side of parallel flat 81, be formed with diaphragm with vapour deposition method.
In the present embodiment, object distance is So=∞, and the full field angle in diagonal angle is ω=103 °, and the effective f-number index is F4.3, image height IH=0.5mm.
In addition, air interface is 4, ST/TD=0.04, MT/TD=0.03, tiltangle=45 °, | φ/φ
A|=0.23.
By between the 1st lens 80 and parallel flat 81, the airspace being set, carry out the imaging surface curvature correction.
Face numbering r d n
dυ
d
1 r
1＝∞ d
1＝0.30 n
1＝1.8830 υ
1＝40.7
2 r
2＝1.02 d
2＝0.20
3 r
3＝∞ d
3＝2.20 n
2＝1.5927 υ
2＝35.3
4 r
4＝∞ d
4＝0.20 n
3＝1.5927 υ
3＝35.3
5 r
5＝0.42 d
5＝1.00 n
4＝1.8830 υ
4＝40.7
6 r
6＝-0.76 d
6＝0.30 n
5＝1.5927 υ
5＝35.3
7 r
7＝57.74 d
7＝1.93 n
6＝1.8830 υ
6＝40.7
8 r
8＝∞ d
8＝0.03
9 r
9=∞ (imaging surface)
As can be seen from Figure 24, the imaging lens unit of present embodiment has the good aberration characteristic in the visible light territory.
Present embodiment is by at the 1st lens 80 with magnification with do not have between the parallel flat 81 of magnification the airspace to be set, and forms the example of air lens.
The 2nd embodiment
Secondly, the imaging lens unit to the 2nd embodiment of the present invention is illustrated.The camera head of present embodiment has the imaging lens unit of the 1st embodiment.Below, enumerate concrete example and describe.
Figure 25 is the schematic illustration as the brief configuration of the optical system of the zoom lens 200 of an example of the camera head of present embodiment.
Zoom lens 200 begin from object side to have: have positive amplification ratio the 1st group of G1, have negative magnification the 2nd group of G2, have positive amplification ratio the 3rd group of G3, have positive amplification ratio the 4th group of G4, include the 5th group of G5 of filter part etc.They are installed in respectively in the not shown picture frame, can be held with respect to the 1st group of mode that G1 moves with the 2nd group of G2, the 3rd group of G3 and the 4th group of G4.
Transportable the 2nd group of G2, the 3rd group of G3 are made of the imaging lens unit 201,202 of the 1st embodiment of the present invention.3 lens separately of imaging lens unit 201,202 do not use picture frame, but adopt the structure that the lens that adjoin each other is engaged along optical axis direction.And, have 1 airspace and 1 composition surface.
Secondly, Figure 26 is that the brief configuration of image unit 900 of the expression camera head that is used for present embodiment is along the sectional view of optical axis direction.
Shown in Figure 26 (a), image unit 900 has imaging lens unit 150 and imaging apparatus 901.
Though in this example, imaging lens unit 150 engages 3 lens and forms as one by flange portion, and the imaging lens unit of the 1st embodiment of the present invention all can be used.
Imaging apparatus 901 has photoelectric conversion device CCD902 and the lenticule 903 that forms on semiconductor wafer.And, on the sensitive surface of CCD902, form microlens array 903.
Spacer 905 adopts such structure: by for example having shape such as wedge shape, can adjust respectively imaging lens unit 150 along the position of optical axis direction and degree of tilt and and cover glass 904 between the interval.
Figure 26 (b) is depicted as the example of another image unit 900 '.Image unit 900 ' replaces imaging lens unit 150, has used another imaging lens unit 151.Imaging lens unit 151 has a plurality of locator protrusions 151a on flange portion of the optical element that is disposed at the final face of imaging side etc.By these locator protrusionss 151a, can omit spacer 905.In addition, image unit 900 ' is to replace imaging apparatus 901, adopts the example that has CCD902 and microlens array 903 and do not have the imaging apparatus 910 of cover glass 904.
Figure 26 (c) is depicted as another image unit 900 " example.Image unit 900 " have imaging lens unit 152 and an imaging apparatus 910.Imaging lens unit 152 has a plurality of locator protrusions 152a on optical element flange portion that is disposed at the final face of imaging side etc.; In addition, the peripheral part of CCD902 aligns with flange side 152c (side).
If adopt imaging lens unit 152 and array of optical elements is overlapping and engage the method for cutting off afterwards, can make such structure at an easy rate.That is to say, can followingly make: will engage after good array of optical elements positions with respect to the semiconductor wafer that CCD902 is formed array-like, with bonding agent 906 locator protrusions 152a is bonded on the semiconductor wafer, then by cutting off array of optical elements simultaneously and semiconductor wafer is made.
Below, the object lesson of the camera head of the present embodiment of having used image unit 900 is described.
Shown in Figure 27 is an example that image unit 900 is used for capsule endoscope 300.
Secondly, shown in Figure 28 for image unit 900 being used for the example of portable terminal 400.Figure 28 (a) and (b) are respectively front view, side view, and Figure 28 (c) is the C-C sectional view of Figure 28 (a).
Shown in Figure 28 (c), inside at portable terminal 400, be included in that CCD902 in the image unit 900 is electrically connected with circuit main board 409 on being fixed in mainboard installation portion 410 and fixed thereon, the cover glass 405 that is provided with on the direction of image pickup part optical axis 407 is with these image unit 900 sealings.
Secondly, shown in Figure 29 is an example that image unit 900 is used for personal computer 500.Figure 29 is the perspective key diagram that is used to illustrate the brief configuration of personal computer 500.
Secondly, shown in Figure 30 is an example that image unit 900 is used for surveillance camera 600.Figure 30 is the side view that is used to illustrate the brief configuration of surveillance camera 600.
Secondly, shown in Figure 31 is an example that image unit 900 is used for automobile mounted usefulness camera system 700.Figure 31 is the skeleton view that is used to illustrate the brief configuration of vehicle mounted camera system 700.
Vehicle mounted camera system 700 is such systems: it has image pickup part 704a, b, c, can pass through signal processing part 702 and switch control portion 703, and image that each image pickup part is taken the photograph is presented in the monitor portion 701.Image pickup part 704a, b, c are connected by optical fiber 705a, b, c respectively.
The section along optical axis direction of image unit 900 is identical with the structure shown in Figure 28 (c), and is fixed on image pickup part 704a, b, the c.
The camera head of present embodiment according to the above description because all be the imaging lens unit that has utilized the 1st embodiment of the present invention, therefore just can reach the action effect identical with the imaging lens unit of the 1st embodiment.
Particularly, according to zoom lens 200, the lens unit because do not use picture frame with the 2nd group of G2, the 3rd group of G3 is connected as a single entity, so but weight reduction and realize miniaturization.
In addition,,, can produce incorporate structure, therefore be consistent, so advantage is to have good productivity owing to manufacturing process with CCD902 owing to utilize with this common manufacture method of the overlapping joint of structure member according to image unit 900.In addition, engage the manufacture method of cutting off afterwards, can increase productivity further, have the advantage that is suitable for a large amount of productions and miniaturization if employing is arranged in array-like with them.
As mentioned above, if adopt the words of imaging lens unit of the present invention, by having the airspace, improved the performance of optical system on the one hand, on the one hand because picture frame parts or picture frame structure are not set for it that optical element is integrated again, therefore, can reach the effect of the imaging lens unit that provides small-sized and cheap.
In addition, if adopt camera head of the present invention,, therefore can reach the effect identical with imaging lens unit of the present invention because used imaging lens unit of the present invention.
Claims (32)
1. an imaging lens unit has a plurality of optical elements, it is characterized in that,
Described a plurality of optical element is bonded with each other with overlapping state,
Under this overlapping state, the optical axis unanimity of each optical element,
The side of each optical element is configured in along in the same plane of the linearly extension of prescribed direction, and this prescribed direction is the direction of or relative described inclined light shaft parallel with described optical axis.
2. imaging lens unit as claimed in claim 1 is characterized in that the number of described optical element is at least 3.
3. imaging lens unit as claimed in claim 1 is characterized in that the side of described each optical element is with respect to the optical axis almost parallel.
4. imaging lens unit as claimed in claim 1 is characterized in that, described optical element is one that constitutes in a plurality of optical elements of array of optical elements, and described array of optical elements carries out two-dimensional arrangements with optical element and forms.
5. imaging lens unit as claimed in claim 1 is characterized in that, it is by comprising a slice positive lens at least and constituting with the optical element below 10 of this positive lens in abutting connection with the negative lens of a slice at least of configuration.
6. imaging lens unit as claimed in claim 1 is characterized in that it has the air interface below 10.
7. imaging lens unit as claimed in claim 1 is characterized in that, other face except the optical surface of optical element has been carried out being provided with the processing of light absorption.
8. imaging lens unit as claimed in claim 1 is characterized in that, described optical element engages with the optical lightscreening parts, and the side of these optical lightscreening parts and the side of this optical element are disposed at in the one side.
9. imaging lens unit as claimed in claim 1 is characterized in that described optical element engages with light-blocking member, and the side of this light-blocking member and the side of this optical element are disposed at in the one side.
10. imaging lens unit as claimed in claim 1 is characterized in that,
The flange portion that each optical element has the optical surface of transmitted light and is arranged on this optical surface peripheral part,
Periphery in this flange portion forms jut,
Between the jut that adjoins each other, be formed with the gap along direction parallel with described optical axis or relative described inclined light shaft.
11., it is characterized in that it meets the following conditions as any one described imaging lens unit in the claim 1,2,3,4:
ST/TD＜0.7 (1)
MT/TD＜0.5 (2)
Herein, TD engages the 1st of the optical system that constitutes from described optical element SD is the length summation of airspace on the optical axis to the face of final face on optical axis at interval, and MT is the length maximal value of the airspace on the optical axis.
12. imaging lens unit as claimed in claim 1 is characterized in that, when the hypothesis tiltangle was the angle that normal became of optical axis and the effective range of described optical surface of optical surface of described optical element, the tiltangle of described optical element was spent less than 60.
13. imaging lens unit as claimed in claim 1 is characterized in that, has the composition surface, and meets the following conditions:
0＜|φ/φ
A|＜0.5
Wherein, φ is the magnification as the lens face on described composition surface, φ
AMagnification for the whole optical system of described imaging lens unit.
14. a camera head has imaging lens unit and imaging apparatus, it is characterized in that, it has the described imaging lens unit of claim 1.
15. camera head as claimed in claim 14 is characterized in that, described imaging apparatus engages with the optical element of the final face that constitutes described imaging lens unit.
16. camera head as claimed in claim 15 is characterized in that, the side that described imaging apparatus has with described optical element is disposed at the end face in the one side.
17. the manufacture method of an image unit, this image unit has a plurality of optical elements, it is characterized in that,
A plurality of array of optical elements with described a plurality of optical elements that optical axis alignment arranges so that after described optical axis was consistent and overlapping state is bonded with each other, the direction along or relative described inclined light shaft parallel with described optical axis between described optical element was cut off.
18. the manufacture method of an image unit, this image unit has a plurality of optical elements, it is characterized in that,
Preparation is arranged a plurality of array of optical elements that form by each optical element of a large amount of described a plurality of optical elements;
With the optical axis alignment of described a plurality of optical elements, and with described a plurality of array of optical elements along the overlapping joint of described optical axis direction,
Between adjacent optical element, cut off along the direction of or relative described inclined light shaft parallel with described optical axis.
19. the manufacture method of image unit as claimed in claim 17 is characterized in that, the number of described array of optical elements is at least 3.
20. the manufacture method of image unit as claimed in claim 17 is characterized in that, the side of described each optical element is with respect to the optical axis almost parallel.
21. the manufacture method of image unit as claimed in claim 17 is characterized in that, described each array of optical elements carries out two-dimensional arrangements with optical element and forms.
22. the manufacture method of image unit as claimed in claim 17 is characterized in that, this image unit is by comprising a slice positive lens at least and constituting with the optical element below 10 of this positive lens in abutting connection with the negative lens of a slice at least of configuration.
23. the manufacture method of image unit as claimed in claim 17 is characterized in that, this image unit has the air interface below 10.
24. the manufacture method of image unit as claimed in claim 17 is characterized in that, other face except the optical surface of optical element has been carried out being provided with the processing of light absorption.
25. the manufacture method of image unit as claimed in claim 17 is characterized in that, described optical element engages with the optical lightscreening parts, and the side of these optical lightscreening parts and the side of this optical element are disposed at in the one side.
26. the manufacture method of image unit as claimed in claim 17 is characterized in that, described optical element engages with light-blocking member, and the side of this light-blocking member and the side of this optical element are disposed at in the one side.
27. the manufacture method of image unit as claimed in claim 17 is characterized in that,
The flange portion that each optical element has the optical surface of transmitted light and is arranged on this optical surface peripheral part,
Periphery in this flange portion is formed with jut,
Between the jut that adjoins each other, be formed with the gap along direction parallel with described optical axis or relative described inclined light shaft.
28. the manufacture method of image unit as claimed in claim 17 is characterized in that, meets the following conditions:
ST/TD＜0.7 (1)
MT/TD＜0.5 (2)
Herein, TD engages the 1st of the optical system that constitutes from described optical element SD is the length summation of the airspace on the optical axis to the face of final face on optical axis at interval, and MT is the maximal value of the length of the airspace on the optical axis.
29. the manufacture method of image unit as claimed in claim 17, it is characterized in that, when the hypothesis tiltangle was the angle that normal became of optical axis and the effective range of described optical surface of optical surface of described optical element, the pitch angle 0 of described optical element was spent less than 60.
30. the manufacture method of image unit as claimed in claim 17 is characterized in that, has the composition surface, and meets the following conditions:
0＜|φ/φ
A|＜0.5
Wherein, φ is the magnification as the lens face on described composition surface, φ
AMagnification for the whole optical system of described imaging lens unit.
31. the manufacture method of a camera head is characterized in that,
By a plurality of array of optical elements with a plurality of optical elements that optical axis alignment arranges so that after described optical axis is consistent and overlapping state is bonded with each other, direction along or relative described inclined light shaft parallel with described optical axis between described optical element is cut off, make imaging lens unit, and imaging apparatus engages with the optical element of the final face that constitutes described imaging lens unit.
32. the manufacture method of camera head as claimed in claim 31 is characterized in that, the side that described imaging apparatus has with described optical element is disposed at the end face in the one side.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002188300 | 2002-06-27 | ||
| JP188300/2002 | 2002-06-27 |
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| CN1220089C CN1220089C (en) | 2005-09-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03109857 Expired - Fee Related CN1220089C (en) | 2002-06-27 | 2003-04-11 | Camera shooting lens unit and pick-up device and method for manufacturing same |
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| CN (1) | CN1220089C (en) |
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