CN109270666B - Optical imaging lens and electronic equipment - Google Patents
Optical imaging lens and electronic equipment Download PDFInfo
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- CN109270666B CN109270666B CN201811474676.9A CN201811474676A CN109270666B CN 109270666 B CN109270666 B CN 109270666B CN 201811474676 A CN201811474676 A CN 201811474676A CN 109270666 B CN109270666 B CN 109270666B
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 106
- 230000003287 optical effect Effects 0.000 claims abstract description 62
- 238000003384 imaging method Methods 0.000 claims abstract description 47
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- 201000009310 astigmatism Diseases 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000035945 sensitivity Effects 0.000 description 3
- 238000000465 moulding Methods 0.000 description 2
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an optical imaging lens which is of a six-lens structure, wherein a first lens has positive refractive power, and the object side surface of the first lens is a convex surface at a position close to an optical axis; the second lens element with negative refractive power; the object-side surface of the third lens element is concave at paraxial region, and the image-side surface thereof is convex at paraxial region; the sixth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface. The optical imaging lens adopts reasonable surface shape structure and optimal range combination of optical parameters through each lens, optimizes and configures the surface type of the object side surface of the first lens and limits the relation between the effective radius of the object side surface of the first lens and the effective radius of the image side surface of the sixth lens, can have the characteristics of large aperture, high pixel, high resolution, large field angle and the like, can effectively shorten the total length of the imaging lens on the premise of providing good imaging quality, achieves the purposes of lightness and thinness, has miniaturized lens head and can meet the application requirements. The invention also discloses an electronic device.
Description
Technical Field
The invention relates to the technical field of optical imaging devices, in particular to an optical imaging lens. The invention also relates to an electronic device.
Background
With the rapid development of electronic technologies, portable mobile electronic devices, such as smart phones, tablet computers, automobile data recorders, and motion cameras, have been rapidly popularized, which simultaneously promotes the rapid development of camera module related technologies applied to electronic devices. The development trend of mobile portable electronic devices is light and thin, which makes the demand for miniaturization of camera modules applied to electronic devices higher and higher. With the advancement of semiconductor manufacturing technology, the size of the photosensitive device is shrinking, and accordingly, the optical imaging lens loaded in the camera module has a thinner thickness and a smaller size, which becomes a development requirement of the optical imaging lens. In addition, for some electronic devices, such as smart phones, the ultra-narrow-frame and frameless full-screen design is adopted, and the size of an optical lens head used by the camera module is required to be smaller.
In the prior art, a light and thin optical imaging lens mostly adopts a four-piece or five-piece lens structure, but the lens group with the structure has limitations in the aspects of refractive power distribution, aberration astigmatism correction, sensitivity distribution and the like, and cannot further meet the imaging requirements of higher specifications. Therefore, it is an urgent need in the art to provide an optical imaging lens that can effectively shorten the total length of the optical imaging lens to achieve a light and thin profile and a small lens head on the premise of good imaging quality.
Disclosure of Invention
The invention aims to provide an optical imaging lens which has the characteristics of large aperture, high pixel, high resolution, large field angle and the like, can effectively shorten the total length of the imaging lens on the premise of providing good imaging quality, achieves light and thin, has a miniaturized lens head and can meet the application requirements. The invention also provides electronic equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
an optical imaging lens includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, each having an object-side surface facing an object side and an image-side surface facing an image side, wherein:
the first lens element with positive refractive power has a convex object-side surface at paraxial region;
the second lens element with negative refractive power;
the object side surface of the third lens element is concave at a paraxial region, and the image side surface thereof is convex at a paraxial region;
the sixth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface;
and satisfies the following conditional expressions:
1<SAG11/CT1min<5；
0.3<SD11/SD62<0.5；
wherein, SAG11Representing the horizontal displacement distance, CT, from the intersection point of the object-side surface and the optical axis of the first lens to the maximum effective radius of the object-side surface of the first lens on the optical axis1minRepresenting a minimum distance, SD, between an object side surface of the first lens and an image side surface of the first lens11Representing the effective radius, SD, of the object-side surface of the first lens62Representing an effective radius of an image-side surface of the sixth lens.
Preferably, the image-side surface of the fourth lens element is concave at the paraxial region and has at least one inflection point.
Preferably, the following conditional formula is also satisfied: -1<(R41-R42)/(R41+R42) Is less than or equal to 5, wherein R is41Represents a radius of curvature, R, of an object-side surface of the fourth lens42Represents a radius of curvature of the image-side surface of the fourth lens.
Preferably, the following conditional formula is also satisfied: BL/TTL is more than or equal to 0.15 and less than or equal to 0.4, wherein BL represents the distance between the image side surface of the sixth lens and the imaging surface on the optical axis, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
Preferably, the following conditional formula is also satisfied: 2 is less than or equal to CT1/ET1Less than or equal to 5, wherein CT1Denotes the thickness of the first lens on the optical axis, ET1Representing the edge thickness of the first lens at the maximum radius.
Preferably, the following conditional formula is also satisfied: 2<CT1/CT2<3, wherein CT1Representing the thickness of said first lens on the optical axis, CT2Represents the thickness of the second lens on the optical axis.
Preferably, the following conditional formula is also satisfied: yc is not less than 0.242/SD42<0.5, wherein Yc42Representing the vertical distance, SD, of an inflection point on the image-side surface of said fourth lens from the optical axis42Representing the effective radius of the image side surface of the fourth lens.
Preferably, the following conditional formula is also satisfied: 1<f/f5<2, where f denotes a focal length of the optical imaging lens，f5Denotes a focal length of the fifth lens.
Preferably, the following conditional formula is also satisfied: TTL is less than or equal to 5.00 mm, wherein TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
An electronic device comprises an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and an optical imaging lens, and the electronic photosensitive element is arranged on an imaging surface of the optical imaging lens.
In view of the above technical solutions, the optical imaging lens provided by the present invention is a six-lens structure, and includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, where an object side light ray passes through the lens elements in sequence to be imaged on an imaging plane located at the image side of the sixth lens element. Each lens of the optical imaging lens adopts a reasonable surface shape structure and the optimal range combination of optical parameters of each lens, and has good imaging quality. The imaging lens has the characteristic of a large aperture by optimally configuring the surface shape of the object side surface of the first lens; and the front port diameter of the optical lens is smaller by limiting the relation between the effective radius of the object side surface of the first lens and the effective radius of the image side surface of the sixth lens. The optical imaging lens provided by the invention has the characteristics of large aperture, high pixel, high resolution, large field angle and the like, can effectively shorten the total length of the imaging lens on the premise of providing good imaging quality, achieves light and thin, is miniaturized in the lens head and can meet the application requirements.
The electronic equipment provided by the invention can achieve the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical imaging lens according to embodiment 1 of the present invention;
fig. 2 is a distortion field curvature diagram of the optical imaging lens in embodiment 1 of the present invention;
fig. 3 is a spherical aberration curve chart of the optical imaging lens in embodiment 1 of the present invention;
fig. 4 is a schematic structural diagram of an optical imaging lens according to embodiment 2 of the present invention;
fig. 5 is a distortion field curvature diagram of the optical imaging lens in embodiment 2 of the present invention;
fig. 6 is a spherical aberration curve chart of the optical imaging lens in embodiment 2 of the present invention;
fig. 7 is a schematic structural diagram of an optical imaging lens according to embodiment 3 of the present invention;
fig. 8 is a distortion field curvature diagram of the optical imaging lens in embodiment 3 of the present invention;
fig. 9 is a spherical aberration curve chart of the optical imaging lens in embodiment 3 of the present invention;
fig. 10 is a schematic structural diagram of an optical imaging lens according to embodiment 4 of the present invention;
fig. 11 is a distortion field curvature diagram of the optical imaging lens in embodiment 4 of the present invention;
fig. 12 is a spherical aberration curve chart of the optical imaging lens in embodiment 4 of the present invention;
fig. 13 is a schematic structural diagram of an optical imaging lens according to embodiment 5 of the present invention;
fig. 14 is a distortion field curvature diagram of the optical imaging lens in embodiment 5 of the present invention;
fig. 15 is a spherical aberration curve chart of the optical imaging lens in embodiment 5 of the present invention;
FIG. 16 shows SAG in the optical imaging lens system according to embodiment 1 of the invention11A schematic diagram of (a);
FIG. 17 shows Yc in the optical imaging lens system according to embodiment 1 of the invention42Schematic representation of (a).
In the above figures:
a first lens: 110. 210, 310, 410, 510; an object-side surface: 111. 211, 311, 411, 511; image-side surface: 112. 212, 312, 412, 512;
second lens: 120, 220, 320, 420, 520; object side surface: 121, 221, 321, 421, 521; image-side surface: 122, 222, 322, 422, 522;
130, 230, 330, 430, 530; object side surfaces 131, 231, 331, 431, 531; image-side surface: 132, 232, 332, 432, 532;
fifth lens element (150, 250, 350, 450, 550); object side surfaces 151, 251, 351, 451, 551; image-side surface: 152, 252, 352, 452, 552;
an infrared filter: 170. 270, 370, 470, 570; imaging surface: 180. 280, 380, 480, 580; aperture: 100. 200, 300, 100, 500; fourth lens image-side inflection point: 1421.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side, wherein each lens is provided with an object side surface facing an object side and an image side surface facing an image side, and the optical imaging lens comprises: the first lens element with positive refractive power has a convex object-side surface at paraxial region; the second lens element with negative refractive power; the object side surface of the third lens element is concave at a paraxial region, and the image side surface thereof is convex at a paraxial region; the sixth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface.
It should be noted that the refractive power refers to the refractive power of the optical system for reflecting the incident parallel light beam. The optical system has positive refractive power, which indicates that the refraction of the light rays is convergent; the optical system has negative refractive power, indicating that the refraction of light is divergent. In the optical imaging lens system provided by the present invention, if the refractive power or the focal length of the lens element does not define the position of the region, it means that the refractive power or the focal length of the lens element can be the refractive power or the focal length of the lens element at the paraxial region.
For each lens arrangement in the optical imaging lens, in a case of from left to right from an object side to an image side, a convex object side of the lens means that any point on a passing surface of the object side of the lens is a tangent plane, the surface is always on the right of the tangent plane, and the curvature radius of the surface is positive, otherwise, the object side of the lens is a concave surface, and the curvature radius of the surface is negative. The image side surface of the lens is convex, which means that any point on the passing surface of the image side surface of the lens is tangent, the surface is always on the left side of the tangent plane, the curvature radius is negative, otherwise, the image side surface is concave, and the curvature radius is positive. If a section is made through any point on the object-side or image-side surface of the lens, the surface has both a portion to the left of the section and a portion to the right of the section, and the surface has points of inflection. The above applies to the determination of the presence of irregularities at the paraxial region of the object-side surface and the image-side surface of the lens. In the optical imaging lens provided by the invention, if the lens surface is a convex surface and the position of the convex surface is not defined, the convex surface can be positioned at the position of the lens surface close to the optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located at the position of the lens surface near the optical axis.
The object light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens to form an image on an image plane located on the image side of the sixth lens. The first lens element with positive refractive power has a convex object-side surface at paraxial region, and can adjust its positive refractive power configuration to shorten total track length of the imaging lens assembly. The second lens element with negative refractive power can correct the aberration generated by the first lens element, and preferably, the object-side surface of the second lens element can be convex at a paraxial region thereof, which can help to enhance correction of the non-point aberration of the imaging lens and enhance correction of the off-axis aberration. The third lens element with positive refractive power can effectively distribute the refractive power of the first lens element, thereby reducing the sensitivity of the imaging lens assembly. The sixth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface, which helps to keep the principal point of the optical system away from the image-side end, thereby effectively shortening the total track length of the optical imaging lens, facilitating the miniaturization of the optical imaging lens, and further correcting off-axis aberration to improve the peripheral imaging quality.
In the optical imaging lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens do not move relatively, and an air space can be arranged between every two adjacent lenses on an optical axis, so that the assembly of the lenses is facilitated, and the manufacturing yield is improved.
The optical imaging lens meets the condition 1 by optimally configuring the surface shape of the object side surface of the first lens<SAG11/CT1min<5，SAG11The horizontal displacement distance from the intersection point of the object side surface of the first lens and the optical axis to the maximum effective radius position of the object side surface of the first lens to the optical axis (if the horizontal displacement is towards the image side, SAG11Is a positive value; if the horizontal displacement is towards the object side, SAG11Negative value), CT1minThe minimum distance between the object side surface of the first lens and the image side surface of the first lens is represented, so that the imaging lens has a large aperture configuration, and incident light can be favorably concentrated on an imaging surface to improve illumination. In addition, the first lens and the sixth lens satisfy 0.3<SD11/SD62<0.5，SD11To representEffective radius of the object-side surface of the first lens, SD62The effective radius of the image side surface of the sixth lens is represented, the ratio relation between the effective radius of the object side surface of the first lens and the effective radius of the image side surface of the sixth lens is limited, so that the diameter of a front port of the optical lens is small, the large image height of the system is kept to ensure high pixels, if the effective radius exceeds the upper limit, the lens head is too large and does not meet the miniaturization design standard of the lens head in some applications, and if the effective radius exceeds the lower limit, the astigmatism, the spherical aberration and other aberrations of the lens are poor and cannot meet the imaging quality requirement.
Therefore, according to the optical imaging lens, each lens adopts a reasonable surface shape structure and the optimal range combination of optical parameters of each lens can have good imaging quality, and has the characteristics of large aperture, high pixel, high resolution, large field angle and the like, the total length of the imaging lens can be effectively shortened on the premise of providing good imaging quality, the optical imaging lens is light and thin, the lens head is miniaturized, and the application requirements can be met.
In the optical imaging system disclosed by the invention, the lens can be made of plastic, and when the lens is made of plastic, the production cost can be effectively reduced. In addition, the object-side surface and the image-side surface of each lens can be Aspheric Surfaces (ASP), the ASP can be easily manufactured into shapes other than spherical surfaces, more control variables are obtained to reduce aberration, and the number of the lenses is further reduced, so that the total length of the optical imaging lens can be effectively reduced.
In addition, in the optical imaging lens, at least one diaphragm can be arranged according to requirements so as to reduce stray light and be beneficial to improving the imaging quality. In the optical imaging lens of the present invention, the aperture configuration may be a front aperture, i.e. the aperture is disposed between the object and the first lens, or a middle aperture, i.e. the aperture is disposed between the first lens and the imaging plane. If the diaphragm is a front diaphragm, the exit pupil of the optical imaging lens can generate a longer distance with the imaging surface, so that the optical imaging lens has a telecentric effect, and the efficiency of receiving images by a CCD or a CMOS of a photosensitive surface of the electronic photosensitive element can be increased; if the diaphragm is arranged in the middle, the wide-angle lens is beneficial to expanding the field angle of the system, and the optical imaging lens has the advantage of a wide-angle lens.
In a preferred embodiment, the fourth lens element with negative refractive power and the third lens element can form a positive and a negative telescopic structure, thereby effectively reducing the total track length of the imaging lens assembly. The image-side surface of the fourth lens element is concave at the paraxial region and has at least one inflection point for enhancing astigmatism correction.
Preferably, the optical imaging lens further satisfies the following conditional expression: -1<(R41-R42)/(R41+R42) Is less than or equal to 5, wherein R is41Represents a radius of curvature, R, of an object-side surface of the fourth lens42Represents a radius of curvature of the image-side surface of the fourth lens. Therefore, the curvature radius of the fourth lens can be adjusted better, so that the shape of the fourth lens is smoother and is beneficial to molding, and the correction of partial astigmatic field curvature is facilitated.
Preferably, the optical imaging lens further satisfies the following conditional expression: BL/TTL is more than or equal to 0.15 and less than or equal to 0.4, wherein BL represents the distance between the image side surface of the sixth lens and the imaging surface on the optical axis, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis. Therefore, the back focus can be ensured on the basis of miniaturization of the lens, and the space and the manufacturability are favorably improved. Preferably, BL/TTL is more than or equal to 0.18 and less than or equal to 0.20.
Preferably, the optical imaging lens further satisfies the following conditional expression: 2 is less than or equal to CT1/ET1Less than or equal to 5, wherein CT1Denotes the thickness of the first lens on the optical axis, ET1Representing the edge thickness of the first lens at the maximum radius. The ratio of the middle thickness to the edge thickness of the first lens is reasonably controlled, so that the manufacturing and molding of the first lens are facilitated, and the manufacturing yield of the first lens is increased.
Preferably, the optical imaging lens further satisfies the following conditional expression: 2<CT1/CT2<3, wherein CT1Representing the thickness of said first lens on the optical axis, CT2Represents the thickness of the second lens on the optical axis. The imaging lens has better distortion elimination capability while ensuring miniaturization by reasonably configuring the central thickness of the first lens and the central thickness of the second lens.
Preferably, the optical imaging lens further satisfies the following conditional expression: yc is not less than 0.242/SD42<0.5, wherein Yc42Representing the vertical distance, SD, of an inflection point on the image-side surface of said fourth lens from the optical axis42Representing the effective radius of the image side surface of the fourth lens. Thereby, the aberration of the off-axis field of view is corrected.
Preferably, the optical imaging lens further satisfies the following conditional expression: 1<f/f5<2, where f denotes a focal length of the optical imaging lens, f5Denotes a focal length of the fifth lens. By reasonably distributing the ratio of the total focal length of the optical imaging lens to the focal length of the fifth lens, the focal power can be effectively distributed, and the sensitivity of the system is reduced.
Preferably, the optical imaging lens further satisfies the following conditional expression: TTL is less than or equal to 5.00 mm, wherein TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis. By controlling the total optical length of the optical imaging lens, the miniaturization of the lens is facilitated.
The optical imaging lens of the present invention will be described in detail with reference to specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
[ example 1 ]
Referring to fig. 1, a schematic structural diagram of an optical imaging lens according to embodiment 1 is shown. As can be seen, the optical imaging lens of the present embodiment includes an aperture stop 100, a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, and a sixth lens element 160, which are sequentially disposed from an object side to an image side along an optical axis, each of the lens elements has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each of the lens elements are aspheric.
The first lens element 110 with positive refractive power has a convex object-side surface 111 at a paraxial region and a concave image-side surface 112 at a paraxial region, and is made of plastic material.
The second lens element 120 with negative refractive power has a convex object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region, and is made of plastic material.
The third lens element 130 with positive refractive power has a concave object-side surface 131 at a paraxial region and a convex image-side surface 132 at a paraxial region, and is made of plastic material.
The fourth lens element 140 with negative refractive power has a convex object-side surface 141 at a paraxial region, a concave image-side surface 142 at a paraxial region, and at least one inflection point on the image-side surface 142.
The fifth lens element 150 with positive refractive power has a concave object-side surface 151 at a paraxial region and a convex image-side surface 152 at a paraxial region, and is made of plastic material.
The sixth lens element 160 with negative refractive power has a concave object-side surface 161 at a paraxial region, a concave image-side surface 162 at a paraxial region, and at least one inflection point on the image-side surface 162.
In addition, the optical imaging lens further includes an infrared filter 170 disposed between the sixth lens element 160 and the imaging surface 180, and the infrared filter 170 filters out infrared band light entering the optical lens assembly to prevent infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The values of the conditional expressions in the present embodiment are shown in the following table:
referring to fig. 16 and 17, SAG, the horizontal displacement distance between the intersection point of the object-side surface 111 and the optical axis and the maximum effective radius position of the object-side surface 111 of the first lens on the optical axis11As shown in FIG. 16, the vertical distance Yc from the inflection point 1421 on the image-side surface 142 of the fourth lens element to the optical axis42As shown in fig. 17. SAG in the following examples11、Yc42All the details can be found in fig. 16 or fig. 17.
In the detailed optical data of embodiment 1, as shown in table 1-1, the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the optical imaging lens, Fno is the aperture value, FOV is the maximum field of view, and surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Surfaces 1-13 sequentially represent aperture stop 100, first lens object-side surface 111, first lens image-side surface 112, second lens object-side surface 121, second lens image-side surface 122, third lens object-side surface 131, third lens image-side surface 132, fourth lens object-side surface 141, fourth lens image-side surface 142, fifth lens object-side surface 151, fifth lens image-side surface 152, sixth lens object-side surface 161, and sixth lens image-side surface 162.
TABLE 1-1
Each lens in the optical imaging lens adopts an aspheric surface design, and the curve equation of the aspheric surface is expressed as follows:
wherein X represents the relative distance between a point on the aspheric surface with a distance of Y from the optical axis and a tangent plane tangent to the vertex on the aspheric surface optical axis; (ii) a R represents a radius of curvature; y represents a perpendicular distance between a point on the aspherical curve and the optical axis; k represents a conic coefficient; ai represents the i-th order aspheric coefficients.
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 1-2, where k represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the aspherical surface coefficients of 4 th to 20 th orders, respectively. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration graphs of the embodiments, and the definitions of the data in the tables are the same as those in tables 1-1 and 1-2 of embodiment 1, which is not repeated herein.
Tables 1 to 2
The distortion field curvature diagram and the spherical aberration curve diagram of the optical imaging lens of the present embodiment are respectively shown in fig. 2 and fig. 3, wherein the wavelength in the distortion field curvature diagram is 0.555 μm, and the wavelength in the spherical aberration curve diagram is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
[ example 2 ]
Referring to fig. 4, a schematic structural diagram of an optical imaging lens of embodiment 2 is shown. As can be seen, the optical imaging lens of the present embodiment includes an aperture stop 200, a first lens element 210, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, and a sixth lens element 260, which are sequentially disposed from an object side to an image side along an optical axis, each of the lens elements has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each of the lens elements are aspheric.
The first lens element 210 with positive refractive power has a convex object-side surface 211 at a paraxial region and a concave image-side surface 212 at a paraxial region, and is made of plastic material.
The second lens element 220 with negative refractive power has a convex object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region, and is made of plastic material.
The third lens element 230 with positive refractive power has a concave object-side surface 131 at a paraxial region and a convex image-side surface 232 at a paraxial region, and is made of plastic.
The fourth lens element 240 with positive refractive power has a convex object-side surface 241 at a paraxial region, a concave image-side surface 242 at a paraxial region, and at least one inflection point on the image-side surface 242.
The fifth lens element 250 with positive refractive power has a concave object-side surface 251 and a convex image-side surface 252.
The sixth lens element 260 with negative refractive power has a concave object-side surface 261 at a paraxial region, a concave image-side surface 262 at a paraxial region, and at least one inflection point on the image-side surface 262.
In addition, the optical imaging lens further includes an infrared filter 270 disposed between the sixth lens 260 and the imaging surface 280, and the infrared filter 270 filters the infrared band light entering the optical lens assembly to prevent the infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The values of the conditional expressions in the present embodiment are shown in the following table:
in the detailed optical data of embodiment 2, as shown in table 2-1, the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the optical imaging lens, Fno is the aperture value, FOV is the maximum field of view, and surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Surfaces 1-13 sequentially represent an aperture stop 200, a first lens object side surface 211, a first lens image side surface 212, a second lens object side surface 221, a second lens image side surface 222, a third lens object side surface 231, a third lens image side surface 232, a fourth lens object side surface 241, a fourth lens image side surface 242, a fifth lens object side surface 251, a fifth lens image side surface 252, a sixth lens object side surface 261, and a sixth lens image side surface 262.
TABLE 2-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 2-2, where k represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the aspherical surface coefficients of 4 th to 20 th orders, respectively.
Tables 2 to 2
Fig. 5 and fig. 6 show the distortion field curve and the spherical aberration curve of the optical imaging lens of the present embodiment, wherein the wavelength in the distortion field curve is 0.555 μm, and the wavelength in the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm, respectively.
[ example 3 ]
Referring to fig. 7, a schematic structural diagram of an optical imaging lens of embodiment 3 is shown. As can be seen, the optical imaging lens of the present embodiment includes an aperture stop 300, a first lens element 310, a second lens element 320, a third lens element 330, a fourth lens element 340, a fifth lens element 350, and a sixth lens element 360, which are sequentially disposed along an optical axis from an object side to an image side, each of the lens elements has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each of the lens elements are aspheric.
The first lens element 310 with positive refractive power has a convex object-side surface 311 at a paraxial region and a concave image-side surface 312 at a paraxial region, and is made of plastic material.
The second lens element 320 with negative refractive power has a convex object-side surface 321 at a paraxial region and a concave image-side surface 322 at a paraxial region, and is made of plastic material.
The third lens element 330 with positive refractive power has a concave object-side surface 331 at a paraxial region and a convex image-side surface 332 at a paraxial region, and is made of plastic material.
The fourth lens element 340 with positive refractive power is made of plastic, and has a convex object-side surface 341 at a paraxial region, a concave image-side surface 342 at a paraxial region, and at least one inflection point on the image-side surface 342.
The fifth lens element 350 with positive refractive power has a concave object-side surface 351 at a paraxial region and a convex image-side surface 352 at a paraxial region, and is made of plastic material.
The sixth lens element 360 with negative refractive power has a concave object-side surface 361 at a paraxial region, a concave image-side surface 362 at a paraxial region, and at least one inflection point on the image-side surface 362.
In addition, the optical imaging lens further includes an infrared filter 370 disposed between the sixth lens 360 and the imaging surface 380, and the infrared filter 370 filters the infrared band light entering the optical lens assembly to prevent the infrared light from irradiating the light sensing chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The values of the conditional expressions in the present embodiment are shown in the following table:
in the detailed optical data of embodiment 3, as shown in table 3-1, the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the optical imaging lens, Fno is the aperture value, FOV is the maximum field of view, and surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Surfaces 1-13 represent, in order, aperture stop 300, first lens object side surface 311, first lens image side surface 312, second lens object side surface 321, second lens image side surface 322, third lens object side surface 331, third lens image side surface 332, fourth lens object side surface 341, fourth lens image side surface 342, fifth lens object side surface 351, fifth lens image side surface 352, sixth lens object side surface 361, and sixth lens image side surface 362.
TABLE 3-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 3-2, where k represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the aspherical surface coefficients of 4 th to 20 th orders, respectively.
TABLE 3-2
Fig. 8 and 9 show the distortion field curve and the spherical aberration curve of the optical imaging lens of the present embodiment, wherein the wavelength in the distortion field curve is 0.555 μm, and the wavelength in the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm, respectively.
[ example 4 ]
Referring to fig. 10, a schematic structural diagram of an optical imaging lens of embodiment 4 is shown. As can be seen, the optical imaging lens of the present embodiment includes an aperture stop 400, a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, and a sixth lens element 460, which are sequentially disposed along an optical axis from an object side to an image side, wherein each lens element has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each lens element are aspheric.
The first lens element 410 with positive refractive power has a convex object-side surface 411 and a concave image-side surface 412.
The second lens element 420 with negative refractive power has a convex object-side surface 421 at a paraxial region and a concave image-side surface 422 at the paraxial region, and is made of plastic material.
The third lens element 430 with positive refractive power has a concave object-side surface 431 at a paraxial region and a convex image-side surface 432 at a paraxial region, and is made of plastic material.
The fourth lens element 440 with negative refractive power has a concave object-side surface 441 at a paraxial region, a concave image-side surface 442 at a paraxial region, and at least one inflection point on the image-side surface 442.
The fifth lens element 450 with positive refractive power has a concave object-side surface 451 at a paraxial region and a convex image-side surface 452 at a paraxial region, and is made of plastic material.
The sixth lens element 460 with negative refractive power has a concave object-side surface 361 at a paraxial region, a concave image-side surface 462 at a paraxial region, and at least one inflection point on the image-side surface 462.
In addition, the optical imaging lens further includes an infrared filter 470 disposed between the sixth lens element 460 and the imaging surface 480, and the infrared filter 470 filters the infrared band light entering the optical lens assembly to prevent the infrared light from irradiating the photo sensor chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The values of the conditional expressions in the present embodiment are shown in the following table:
in example 4, as shown in table 4-1, the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the optical imaging lens, Fno is the aperture value, FOV is the maximum field angle, and surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Surfaces 1-13 sequentially represent aperture 400, first lens object side surface 411, first lens image side surface 412, second lens object side surface 421, second lens image side surface 422, third lens object side surface 431, third lens image side surface 432, fourth lens object side surface 441, fourth lens image side surface 442, fifth lens object side surface 451, fifth lens image side surface 452, sixth lens object side surface 461, and sixth lens image side surface 462.
TABLE 4-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 4-2, where k represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the aspherical surface coefficients of the 4 th to 20 th orders, respectively, of the lens surface.
TABLE 4-2
Fig. 11 and 12 show the distortion field curve and the spherical aberration curve of the optical imaging lens of the present embodiment, respectively, where the wavelength of the distortion field curve is 0.555 μm, and the wavelength of the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm.
[ example 5 ]
Referring to fig. 13, a schematic structural diagram of an optical imaging lens of embodiment 5 is shown. As can be seen, the optical imaging lens of this embodiment includes an aperture stop 500, a first lens element 510, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550 and a sixth lens element 560 arranged in order from an object side to an image side along an optical axis, each lens element has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each lens element are aspheric.
The first lens element 510 with positive refractive power has a convex object-side surface 511 and a concave image-side surface 512.
The second lens element 520 with negative refractive power has a convex object-side surface 521 at a paraxial region and a concave image-side surface 522 at a paraxial region, and is made of plastic material.
The third lens element 530 with positive refractive power has a concave object-side surface 531 at a paraxial region and a convex image-side surface 532 at a paraxial region, and is made of plastic.
The fourth lens element 540 with negative refractive power has a convex object-side surface 541 at a paraxial region, a concave image-side surface 542 at a paraxial region, and at least one inflection point on the image-side surface 542.
The fifth lens element 550 with positive refractive power has a concave object-side surface 551 at paraxial region and a convex image-side surface 552 at paraxial region, and is made of plastic material.
The sixth lens element 560 with negative refractive power has a concave object-side surface 361 at a paraxial region, a concave image-side surface 562 at a paraxial region, and at least one inflection point on the image-side surface 562.
In addition, the optical imaging lens further includes an infrared filter 570 disposed between the sixth lens 560 and the imaging surface 580, and the infrared filter 570 filters the infrared band light entering the optical lens assembly to avoid the infrared light from irradiating the light sensing chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The values of the conditional expressions in the present embodiment are shown in the following table:
in the detailed optical data of embodiment 5, as shown in table 5-1, the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the optical imaging lens, Fno is the aperture value, FOV is the maximum field angle, and surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Surfaces 1-13 sequentially represent aperture stop 500, first lens object-side surface 511, first lens image-side surface 512, second lens object-side surface 521, second lens image-side surface 522, third lens object-side surface 531, third lens image-side surface 532, fourth lens object-side surface 541, fourth lens image-side surface 542, fifth lens object-side surface 551, fifth lens image-side surface 552, sixth lens object-side surface 561, and sixth lens image-side surface 562.
TABLE 5-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 5-2, where k represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the aspherical surface coefficients of the 4 th to 20 th orders, respectively.
TABLE 5-2
Fig. 14 and 15 show distortion field curves and spherical aberration curves of the optical imaging lens of the present embodiment, wherein the wavelength of the distortion field curves is 0.555 μm, and the wavelength of the spherical aberration curves is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
Correspondingly, the embodiment of the invention also provides electronic equipment which comprises an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and the optical imaging lens, and the electronic photosensitive element is arranged on an imaging surface of the optical imaging lens.
In the electronic device provided by the embodiment, the optical imaging lens adopted by the imaging device has the characteristics of large aperture, high pixel, high resolution, large field angle and the like, the total length of the imaging lens can be effectively shortened on the premise of providing good imaging quality, the electronic device is light and thin, the lens head is miniaturized, and the application requirements can be met.
Claims (10)
1. An optical imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, each having an object side surface facing the object side and an image side surface facing the image side, wherein:
the first lens element with positive refractive power has a convex object-side surface at paraxial region;
the second lens element with negative refractive power;
the third lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and the fifth lens element with positive refractive power;
the sixth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface;
and satisfies the following conditional expressions:
1<SAG11/CT1min<5；
0.3<SD11/SD62<0.5；
wherein, SAG11Representing the horizontal displacement distance, CT, from the intersection point of the object-side surface and the optical axis of the first lens to the maximum effective radius of the object-side surface of the first lens on the optical axis1minRepresenting a minimum distance, SD, between an object side surface of the first lens and an image side surface of the first lens11Representing the effective radius, SD, of the object-side surface of the first lens62Representing an effective radius of an image-side surface of the sixth lens.
2. The optical imaging lens of claim 1, wherein the fourth lens element has a concave image-side surface at a paraxial region and has at least one inflection point on the image-side surface.
3. The optical imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: -1<(R41-R42)/(R41+R42) Is less than or equal to 5, wherein R is41Represents a radius of curvature, R, of an object-side surface of the fourth lens42Represents a radius of curvature of the image-side surface of the fourth lens.
4. The optical imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: BL/TTL is more than or equal to 0.15 and less than or equal to 0.4, wherein BL represents the distance between the image side surface of the sixth lens and the imaging surface on the optical axis, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
5. The optical imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 2 is less than or equal to CT1/ET1Less than or equal to 5, wherein CT1Denotes the thickness of the first lens on the optical axis, ET1Representing the edge thickness of the first lens at the maximum radius.
6. The optical imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 2<CT1/CT2<3, wherein CT1Representing the thickness of said first lens on the optical axis, CT2Represents the thickness of the second lens on the optical axis.
7. The optical imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: yc is not less than 0.242/SD42<0.5, wherein Yc42Representing the vertical distance, SD, of an inflection point on the image-side surface of said fourth lens from the optical axis42Representing the effective radius of the image side surface of the fourth lens.
8. The optical imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 1<f/f5<2, where f denotes a focal length of the optical imaging lens, f5Denotes a focal length of the fifth lens.
9. The optical imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: TTL is less than or equal to 5.00 mm, wherein TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
10. An electronic apparatus characterized by comprising an image pickup device including an electron-sensitive element provided to an imaging surface of an optical imaging lens according to any one of claims 1 to 9 and the optical imaging lens.
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| CN110687571B (en) * | 2019-11-28 | 2024-03-19 | 左慈斌 | Lutetium yttrium silicate scintillation crystal radiation detector with exit face matched with lens group |
| CN110687572B (en) * | 2019-11-28 | 2023-12-22 | 左慈斌 | Cadmium tungstate scintillation crystal radiation detector with exit surface matched with lens group |
| CN111045193B (en) * | 2019-12-30 | 2022-07-08 | 诚瑞光学(常州)股份有限公司 | Camera optics |
| CN113296229A (en) * | 2020-02-24 | 2021-08-24 | 江西晶超光学有限公司 | Optical imaging system, image capturing device with same and electronic device |
| WO2021189431A1 (en) * | 2020-03-27 | 2021-09-30 | 南昌欧菲精密光学制品有限公司 | Optical system, camera module, and electronic device |
| CN111239986B (en) * | 2020-03-27 | 2025-05-09 | 江西欧菲光学有限公司 | Optical systems, lens modules and electronic equipment |
| CN112180554B (en) * | 2020-10-20 | 2022-09-06 | 江西晶超光学有限公司 | Optical lens, camera module and terminal |
| CN112230399B (en) | 2020-12-14 | 2021-03-02 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| TWI769784B (en) * | 2021-04-14 | 2022-07-01 | 新鉅科技股份有限公司 | Optical lens system and photographing module |
| CN112965222B (en) * | 2021-05-18 | 2021-08-20 | 江西联益光学有限公司 | Optical lens |
| CN114200648B (en) * | 2021-12-17 | 2023-12-15 | 广东旭业光电科技股份有限公司 | High-definition optical imaging lens and electronic equipment |
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