CN111308659B - Optical system, camera module and electronic device - Google Patents
Optical system, camera module and electronic device Download PDFInfo
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- CN111308659B CN111308659B CN202010182202.8A CN202010182202A CN111308659B CN 111308659 B CN111308659 B CN 111308659B CN 202010182202 A CN202010182202 A CN 202010182202A CN 111308659 B CN111308659 B CN 111308659B
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- 238000003384 imaging method Methods 0.000 claims description 35
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- 201000009310 astigmatism Diseases 0.000 description 18
- 238000013461 design Methods 0.000 description 9
- 230000035945 sensitivity Effects 0.000 description 9
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- 239000011521 glass Substances 0.000 description 6
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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
- G02B13/18—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
本发明涉及一种光学系统、摄像模组及电子装置。光学系统由物侧至像侧依次包括：具有屈折力的第一透镜，第一透镜的物侧面于近轴处为凹面，像侧面于近轴处为凸面；具有正屈折力的第二透镜，第二透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面；具有正屈折力的第三透镜，第三透镜的像侧面于近轴处为凸面；具有负屈折力的第四透镜，第四透镜的物侧面于近轴处为凹面；具有屈折力的第五透镜；具有负屈折力的第六透镜，第六透镜的物侧面于近轴处为凹面；具有正屈折力的第七透镜，第七透镜的物侧面于近轴处为凸面；及具有负屈折力的第八透镜，第八透镜的物侧面于近轴处为凸面，像侧面于近轴处为凹面。上述光学系统拥有优良的摄像品质。
The present invention relates to an optical system, a camera module and an electronic device. The optical system includes, from the object side to the image side, a first lens with refractive power, the object side surface of the first lens is concave at the paraxial position, and the image side surface is convex at the paraxial position; a second lens with positive refractive power, the object side surface of the second lens is convex at the paraxial position, and the image side surface is concave at the paraxial position; a third lens with positive refractive power, the image side surface of the third lens is convex at the paraxial position; a fourth lens with negative refractive power, the object side surface of the fourth lens is concave at the paraxial position; a fifth lens with refractive power; a sixth lens with negative refractive power, the object side surface of the sixth lens is concave at the paraxial position; a seventh lens with positive refractive power, the object side surface of the seventh lens is convex at the paraxial position; and an eighth lens with negative refractive power, the object side surface of the eighth lens is convex at the paraxial position, and the image side surface is concave at the paraxial position. The above optical system has excellent camera quality.
Description
Technical Field
The present invention relates to the field of image capturing, and in particular, to an optical system, an image capturing module, and an electronic device.
Background
In recent years, as cameras are applied to portable electronic devices such as smartphones, the performance of the cameras also changes over the sky as the user's demands for image quality increase. Theoretically, the system can have more space and freedom to adjust the incident light path by configuring a plurality of lenses, which is one of the most efficient methods for improving the imaging quality of the optical system. How to well configure the performance of each lens in an optical system to ensure high image quality of the system is one of the main concerns of current lens design.
Disclosure of Invention
Based on this, it is necessary to provide an optical system, an imaging module, and an electronic device for solving the problem of how to obtain a multi-lens system with excellent imaging quality.
An optical system, comprising, in order from an object side to an image side:
a first lens element with refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
a second lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
A third lens element with positive refractive power having a convex image-side surface at a paraxial region;
a fourth lens element with negative refractive power having a concave object-side surface at a paraxial region;
A fifth lens element with refractive power;
a sixth lens element with negative refractive power having a concave object-side surface at a paraxial region;
a seventh lens element with positive refractive power having a convex object-side surface at a paraxial region; and
An eighth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
In the above optical system, by making the second lens element have positive refractive power, the aberration correcting ability of the system can be effectively improved, and the sensitivity of the system can be reduced. By designing the object side surface of the second lens element to be convex, the second lens element can bear more positive refractive power, aberration of the whole system can be effectively reduced, sensitivity of the system is reduced, yield of the system is improved, and processing and assembly of subsequent structures are facilitated. The image side surface of the third lens is designed to be convex, so that the first lens and the second lens can be effectively matched to reduce the spherical aberration of the system and improve the aberration correction capability of the system. The object side surface of the seventh lens element is convex, so that the seventh lens element can exhibit reasonable positive refractive power to share part of the refractive power of the system, and avoid excessive concentration of the positive refractive power on the second lens element and the third lens element. In addition, further matching the negative refractive power of the fourth lens and the positive refractive power of the seventh lens is beneficial to the refractive power distribution of the whole system, avoids excessive concentration of refractive power, and is beneficial to balancing the system paraxial chromatic aberration and lateral chromatic aberration. The optical system can have excellent imaging quality by well arranging refractive powers of the lenses and a surface shape relationship.
In one embodiment, the optical system satisfies the following relationship:
TTL/Imgh is less than 1.36; wherein TTL is the distance between the object side surface of the first lens element and the imaging surface of the optical system on the optical axis, imgh is half of the diagonal length of the effective imaging area of the optical system on the imaging surface. When the above relation is satisfied, the optical system can be designed to be miniaturized.
In one embodiment, the optical system satisfies the following relationship:
f/R16 is more than 2 and less than 4; wherein f is an effective focal length of the optical system, and R16 is a radius of curvature of the image side surface of the eighth lens element at the optical axis. When the relation is met, the effective focal length of the optical system and the curvature radius of the image side surface of the eighth lens can be reasonably configured, so that the angle of the principal ray on the imaging surface of the system is reduced, and the photosensitive efficiency of the assembled photosensitive element is improved.
In one embodiment, the optical system satisfies the following relationship:
FNO is less than or equal to 2; wherein FNO is the f-number of the optical system. When the relation is met, the optical system has the characteristic of large caliber, so that the light incoming quantity can be improved, the shot image is clearer, and further high-quality shooting can be realized on scenes with low brightness such as night scenes and starry sky.
In one embodiment, the optical system satisfies the following relationship:
1 < SD12/SD21 < 1.4; wherein SD12 is the maximum effective half-caliber of the image side of the first lens; SD21 is the maximum effective half-caliber of the object side surface of the second lens. When the above relation is satisfied, the front end size of the optical system can be effectively reduced.
In one embodiment, the optical system satisfies the following relationship:
TTL/f is less than 1.65; wherein TTL is a distance between the object side surface of the first lens and the imaging surface of the optical system on the optical axis, and f is an effective focal length of the optical system. When the above relation is satisfied, the optical system can satisfy the requirement of a miniaturized design.
In one embodiment, the optical system satisfies the following relationship:
tan (HFOV) > 1.09; wherein the HFOV is one half of the maximum field angle of the optical system. When the above relationship is satisfied, the optical system has a small wide angle characteristic.
In one embodiment, the optical system satisfies the following relationship:
T23/CT3 is more than 0 and less than 0.9; wherein T23 is a distance between the image side surface of the second lens element and the object side surface of the third lens element on the optical axis, and CT3 is a thickness of the third lens element on the optical axis. When the relation is satisfied, the deflection angle of the light ray in the system is reduced, so that the sensitivity of the system can be effectively reduced.
In one embodiment, the object side surface and the image side surface of each lens in the optical system are aspheric. The aspheric surface type arrangement can effectively help the optical system to eliminate aberration, solve the problem of distortion of vision, and is beneficial to the optical system to realize miniaturization design, so that the optical system can have excellent optical performance while keeping miniaturization.
An image pickup module includes a photosensitive element and the optical system according to any one of the above embodiments, wherein the photosensitive element is disposed on an image side of the optical system. By adopting the optical system, the camera module can have excellent camera quality.
An electronic device comprises a fixing piece and the camera shooting module, wherein the camera shooting module is arranged on the fixing piece. Through adopting above-mentioned module of making a video recording, electron device can possess good shooting function.
Drawings
FIG. 1 is a schematic diagram of an optical system according to a first embodiment of the present application;
fig. 2 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the first embodiment;
FIG. 3 is a schematic diagram of an optical system according to a second embodiment of the present application;
fig. 4 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the second embodiment;
FIG. 5 is a schematic diagram of an optical system according to a third embodiment of the present application;
fig. 6 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the third embodiment;
FIG. 7 is a schematic diagram of an optical system according to a fourth embodiment of the present application;
Fig. 8 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the fourth embodiment;
FIG. 9 is a schematic diagram of an optical system according to a fifth embodiment of the present application;
fig. 10 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the fifth embodiment;
FIG. 11 is a schematic view of an optical system according to a sixth embodiment of the present application;
Fig. 12 is a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system in the sixth embodiment;
FIG. 13 is a schematic diagram of an image capturing module according to an embodiment of the present application;
Fig. 14 is a schematic diagram of an electronic device according to an embodiment of the application.
Detailed Description
In order that the invention may be readily understood, a more complete description of the invention will be rendered by reference to the appended drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly on" another element, there are no intervening elements present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description presented herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, in some embodiments of the present application, the optical system 10 includes, in order from an object side to an image side, a first lens L1, a second lens L2, a stop STO, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, and an eighth lens L8. The first lens element L1 with positive refractive power, the second lens element L2 with positive refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive or negative refractive power, the sixth lens element L6 with negative refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. The first lens L1 to the eighth lens L8 each have only one lens, and each lens in the optical system 10 is disposed coaxially with the stop STO, that is, the optical axis of each lens and the center of the stop STO are all on the same straight line, which may be referred to as the optical axis of the optical system 10.
The first lens element L1 comprises an object-side surface S1 and an image-side surface S2, the second lens element L2 comprises an object-side surface S3 and an image-side surface S4, the third lens element L3 comprises an object-side surface S5 and an image-side surface S6, the fourth lens element L4 comprises an object-side surface S7 and an image-side surface S8, the fifth lens element L5 comprises an object-side surface S9 and an image-side surface S10, the sixth lens element comprises an object-side surface S11 and an image-side surface S12, the seventh lens element comprises an object-side surface S13 and an image-side surface S14, and the eighth lens element comprises an object-side surface S15 and an image-side surface S16. In addition, the optical system 10 further has an imaging surface S19, and the imaging surface S19 is located at the image side of the eighth lens. Generally, the imaging surface S19 of the optical system 10 coincides with the photosensitive surface of the photosensitive element, and for ease of understanding, the imaging surface S19 may be regarded as the photosensitive surface of the photosensitive element.
In the above embodiment, the object-side surface S1 of the first lens element L1 is concave at the paraxial region, and the image-side surface S2 is convex at the paraxial region; the object side surface S3 of the second lens element L2 is convex at the paraxial region, and the image side surface S4 is concave at the paraxial region; the image-side surface S6 of the third lens element L3 is convex at the paraxial region; the object side surface S7 of the fourth lens element L4 is concave at the paraxial region; the object side surface S11 of the sixth lens is a concave surface at the paraxial region; the object side surface S13 of the seventh lens is a convex surface at the paraxial region; the object side surface S15 of the eighth lens element is convex at the paraxial region, and the image side surface S16 is concave at the paraxial region.
In the optical system 10 described above, by making the second lens element L2 have positive refractive power, the aberration correcting capability of the system can be effectively improved, and the sensitivity of the system can be reduced. By designing the object side surface S3 of the second lens element L2 to be convex, the second lens element L2 can bear more positive refractive power, aberration of the whole system can be effectively reduced, sensitivity of the system can be reduced, yield of the system can be improved, and processing and assembly of subsequent structures can be facilitated. The image-side surface S6 of the third lens element L3 is convex, so as to effectively cooperate with the first lens element L1 and the second lens element L2 to reduce the system spherical aberration and improve the aberration correction capability of the system. The object-side surface S13 of the seventh lens element L7 is convex, so that the seventh lens element L7 can exhibit a reasonable positive refractive power to share a portion of the refractive power of the system and avoid excessive concentration of the positive refractive power on the second lens element L2 and the third lens element L3. In addition, further matching the negative refractive power of the fourth lens element L4 and the positive refractive power of the seventh lens element L7 is beneficial to the refractive power distribution of the entire system, avoiding excessive concentration of refractive power, and simultaneously helping to balance the chromatic aberration of the system and the lateral chromatic aberration. The optical system 10 can have excellent imaging quality by properly arranging refractive powers of the respective lenses and a surface shape relationship.
In the above embodiment, the object side surface and the image side surface of each of the first lens element L1 to the eighth lens element L8 are aspheric, and the object side surface S15 and the image side surface S16 of each of the eighth lens element L8 have inflection points. The aspheric surface type arrangement can further help the optical system 10 eliminate aberration, solve the problem of distortion of vision, and is beneficial to miniaturization design of the optical system 10, so that the optical system 10 can have excellent optical effect on the premise of keeping miniaturization design. Of course, in other embodiments, the object-side surface of any one of the first lens element L1 to the eighth lens element L8 may be spherical or aspherical; the image side surface of any one of the first lens element L1 to the eighth lens element L8 may be spherical or aspherical, and the combination of the spherical surface and the aspherical surface can effectively eliminate the aberration problem, so that the optical system 10 has excellent imaging effect, and meanwhile, the flexibility of lens design and assembly is improved. In particular, when the eighth lens L8 is an aspherical lens, it is advantageous to perform final correction of aberrations generated by the respective lenses in front, thereby improving imaging quality. It should be noted that the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely exemplary references and are not drawn to scale.
The surface type calculation of the aspherical surface can refer to an aspherical surface formula:
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the vertex of the aspheric surface, k is the conic coefficient, and Ai is the coefficient corresponding to the i-th higher term in the aspheric surface formula.
On the other hand, in some embodiments, when the object side or image side of a certain lens is aspheric, the surface may be entirely convex or entirely concave; alternatively, the surface may be designed to have a inflection point, where the surface shape from the center to the edge changes, e.g., the surface is convex at the center and concave at the edge. It should be noted that, when one side of the lens is described as being convex at the optical axis (the central region of the side), the embodiment of the application is understood to be that the region of the side of the lens near the optical axis is convex, and thus the side is also considered to be convex at the paraxial region; when describing a lens with one side that is concave at the circumference, it is understood that the side is concave in the area near the maximum effective half-aperture. For example, when the side surface is convex at the paraxial region and is also convex at the circumferential region, the shape of the side surface from the center (optical axis) to the edge direction may be purely convex; or first transition from a convex shape in the center to a concave shape and then change to convex near the maximum effective half-diameter. The various shapes and structures (concave-convex relationship) of the side surfaces are not fully shown here, but other cases can be deduced from the above examples and should be considered as the description of the present application.
In the above embodiment, the material of each lens in the optical system 10 is plastic. Of course, in some embodiments, each lens in the optical system 10 is made of glass. The plastic lens can reduce the weight of the optical system 10 and reduce the production cost, while the glass lens can withstand higher temperatures and has excellent optical effects. In other embodiments, the material of the first lens L1 is glass, and the material of the second lens L2 to the eighth lens L8 is plastic, and at this time, since the material of the lens located at the object side of the optical system 10 is glass, the glass lenses located at the object side have good tolerance effects to extreme environments, and are not easily affected by the object side environment to cause aging and the like, so that when the optical system 10 is in extreme environments such as exposure to high temperature, the structure can better balance the optical performance and cost of the system. Of course, the arrangement of the lens materials in the optical system 10 is not limited to the above embodiment, and any of the lenses may be made of plastic or glass.
In some embodiments, the optical system 10 includes an infrared cut filter L9, and the infrared cut filter L9 is disposed on the image side of the eighth lens L8 and is disposed opposite to each lens in the optical system 10. The infrared cut filter L9 includes an object side surface S17 and an image side surface S18. The infrared cut filter L9 is used for filtering infrared light, and preventing the infrared light from reaching the imaging surface S19 of the system, thereby preventing the infrared light from interfering with normal imaging. An infrared cut filter L9 may be assembled with each lens as a part of the optical system 10. In other embodiments, the ir cut filter L9 is not a component of the optical system 10, and the ir cut filter L9 may be installed between the optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into the image capturing module. In some embodiments, the infrared cut filter L9 may also be disposed on the object side of the first lens L1. In addition, in some embodiments, the infrared cut filter L9 may not be provided, and the effect of filtering infrared light may be achieved by providing a filter plating layer on any one of the first lens L1 to the eighth lens L8.
In other embodiments, the first lens element L1 can also include two or more lens elements, wherein an object-side surface of the lens element closest to the object-side is an object-side surface S1 of the first lens element L1, and an image-side surface of the lens element closest to the image-side is an image-side surface S2 of the first lens element L1. Accordingly, any one of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in some embodiments is not limited to the case that only one lens is included.
In some embodiments, the optical system 10 also satisfies the following relationships:
TTL/Imgh is less than 1.36; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S19 of the optical system 10 on the optical axis, and Imgh is a half of a diagonal length of an effective imaging area of the optical system 10 on the imaging surface S19. The TTL/Imgh in some embodiments is 1.290, 1.292, 1.295, 1.297, 1.299, or 1.30. When the above relationship is satisfied, the optical system 10 can be designed to be miniaturized.
F/R16 is more than 2 and less than 4; where f is the effective focal length of the optical system 10, and R16 is the radius of curvature of the image-side surface S16 of the eighth lens L8 at the optical axis. In some embodiments, f/R16 is 3.75, 3.78, 3.80, 3.82, 3.85, 3.87, or 3.89. When the above relation is satisfied, the effective focal length of the optical system 10 and the curvature radius of the image side surface S16 of the eighth lens L8 can be reasonably configured, so as to be beneficial to reducing the angle of the chief ray on the imaging surface S19 of the system and improving the photosensitive efficiency of the assembled photosensitive element.
FNO is less than or equal to 2; where FNO is the f-number of optical system 10. The FNO in some embodiments is 1.80, 1.82, 1.84, 1.86, or 1.88. When the above relation is satisfied, the optical system 10 has a large caliber characteristic, so that the light quantity can be increased, the photographed image is clearer, and further, high-quality photographing can be realized for scenes with low brightness such as night scenes, stars and the like.
1 < SD12/SD21 < 1.4; wherein SD12 is the maximum effective half-caliber of the image side surface S2 of the first lens L1; SD21 is the maximum effective half-caliber of the object side surface S3 of the second lens L2. SD12/SD21 in some embodiments is 1.280, 1.283, 1.287, 1.290, 1.292, 1.295, 1.300, 1.305. When the above relationship is satisfied, the front end size of the optical system 10 can be effectively reduced.
TTL/f is less than 1.65; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S19 of the optical system 10 on the optical axis, and f is an effective focal length of the optical system 10. The TTL/f in some embodiments is 1.58, 1.59, 1.60, or 1.61. When the above relationship is satisfied, the optical system 10 can satisfy the requirement of the miniaturization design.
Tan (HFOV) > 1.09; wherein the HFOV is one half of the maximum field angle of the optical system 10. The tan (HFOV) in some embodiments is 1.242, 1.244, 1.245, 1.247, or 1.249. When the above relationship is satisfied, the optical system 10 can realize a small wide angle characteristic.
T23/CT3 is more than 0 and less than 0.9; wherein T23 is the distance between the image side surface S4 of the second lens element L2 and the object side surface S5 of the third lens element L3, and CT3 is the thickness of the third lens element L3 on the optical axis. T23/CT3 in some embodiments is 0.803, 0.806, 0.810, 0.812, 0.815, or 0.818. When the relation is satisfied, the deflection angle of the light ray in the system is reduced, so that the sensitivity of the system can be effectively reduced.
The optical system 10 of the present application will be described in more specific detail below:
First embodiment
Referring to fig. 1 and 2, in the first embodiment, the optical system 10 includes, in order from an object side to an image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a stop STO, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Fig. 2 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the first embodiment, in which reference wavelengths of the astigmatism diagram and the distortion diagram are 555nm.
The object side surface S1 of the first lens element L1 is concave at the paraxial region, and the image side surface S2 is convex at the paraxial region; the object side surface S1 is convex at the circumference and the image side surface S2 is concave at the circumference.
The object side surface S3 of the second lens element L2 is convex at the paraxial region, and the image side surface S4 is concave at the paraxial region; the object side surface S3 is concave at the circumference and the image side surface S4 is convex at the circumference.
The object side surface S5 of the third lens element L3 is convex at the paraxial region, and the image side surface S6 is convex at the paraxial region; the object side surface S5 is concave at the circumference and the image side surface S6 is convex at the circumference.
The object side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image side surface S8 is convex at the paraxial region; the object side surface S7 is convex at the circumference and the image side surface S8 is concave at the circumference.
The object side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image side surface S10 is convex at the paraxial region; the object side surface S9 is convex at the circumference and the image side surface S10 is concave at the circumference.
The object side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image side surface S12 is convex at the paraxial region; the object side surface S11 is convex at the circumference and the image side surface S12 is concave at the circumference.
The object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, and the image-side surface S14 is convex at the paraxial region; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
The object-side surface S15 of the eighth lens element L8 is convex at the paraxial region, and the image-side surface S16 is concave at the paraxial region; the object side surface S15 is concave at the circumference and the image side surface S16 is convex at the circumference.
In the optical system 10 described above, by making the second lens element L2 have positive refractive power, the aberration correcting capability of the system can be effectively improved, and the sensitivity of the system can be reduced. By designing the object side surface S3 of the second lens element L2 to be convex, the second lens element L2 can bear more positive refractive power, aberration of the whole system can be effectively reduced, sensitivity of the system can be reduced, yield of the system can be improved, and processing and assembly of subsequent structures can be facilitated. The image-side surface S6 of the third lens element L3 is convex, so as to effectively cooperate with the first lens element L1 and the second lens element L2 to reduce the system spherical aberration and improve the aberration correction capability of the system. The object-side surface S13 of the seventh lens element L7 is convex, so that the seventh lens element L7 can exhibit a reasonable positive refractive power to share a portion of the refractive power of the system and avoid excessive concentration of the positive refractive power on the second lens element L2 and the third lens element L3. In addition, further matching the negative refractive power of the fourth lens element L4 and the positive refractive power of the seventh lens element L7 is beneficial to the refractive power distribution of the entire system, avoiding excessive concentration of refractive power, and simultaneously helping to balance the chromatic aberration of the system and the lateral chromatic aberration. The optical system 10 can have excellent imaging quality by properly arranging refractive powers of the respective lenses and a surface shape relationship.
The object side surface and the image side surface of each of the first lens element L1 to the eighth lens element L8 are aspheric, and the object side surface S15 and the image side surface S16 of the eighth lens element L8 have inflection points. By matching the aspherical surface type of each lens in the optical system 10, the problem of distortion of the view of the optical system 10 can be effectively solved, and the lens can realize excellent optical effect under the condition of smaller thickness, so that the optical system 10 has smaller volume, and the miniaturization design of the optical system 10 is facilitated.
The material of each lens in the optical system 10 is plastic. The use of plastic lenses can reduce the manufacturing cost of the optical system 10.
In the first embodiment, the optical system 10 satisfies the following relationships:
TTL/Imgh =1.29; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S19 of the optical system 10 on the optical axis, and Imgh is a half of a diagonal length of an effective imaging area of the optical system 10 on the imaging surface S19. When the above relationship is satisfied, the optical system 10 can be designed to be miniaturized.
Fr16=3.89; where f is the effective focal length of the optical system 10, and R16 is the radius of curvature of the image-side surface S16 of the eighth lens L8 at the optical axis. When the above relation is satisfied, the effective focal length of the optical system 10 and the curvature radius of the image side surface S16 of the eighth lens L8 can be reasonably configured, so as to be beneficial to reducing the angle of the chief ray on the imaging surface S19 of the system and improving the photosensitive efficiency of the assembled photosensitive element.
Fno=1.85; where FNO is the f-number of optical system 10. The FNO in some embodiments is 1.80, 1.82, 1.84, 1.86, or 1.88. When the above relation is satisfied, the optical system 10 has a large caliber characteristic, so that the light quantity can be increased, the photographed image is clearer, and further, high-quality photographing can be realized for scenes with low brightness such as night scenes, stars and the like.
SD12/SD21 = 1.287; wherein SD12 is the maximum effective half-caliber of the image side surface S2 of the first lens L1; SD21 is the maximum effective half-caliber of the object side surface S3 of the second lens L2. When the above relationship is satisfied, the front end size of the optical system 10 can be effectively reduced.
TTL/f=1.59; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S19 of the optical system 10 on the optical axis, and f is an effective focal length of the optical system 10. When the above relationship is satisfied, the optical system 10 can satisfy the requirement of the miniaturization design.
Tan (HFOV) =1.25; wherein the HFOV is one half of the maximum field angle of the optical system 10. When the above relationship is satisfied, the optical system 10 has a small wide angle characteristic.
T23/CT3 = 0.81; wherein T23 is the distance between the image side surface S4 of the second lens element L2 and the object side surface S5 of the third lens element L3, and CT3 is the thickness of the third lens element L3 on the optical axis. When the relation is satisfied, the deflection angle of the light ray in the system is reduced, so that the sensitivity of the system can be effectively reduced.
In addition, the respective lens parameters of the optical system 10 are given in tables 1 and 2. Table 2 shows the aspherical coefficients of the lenses in table 1, where K is a conic coefficient and Ai is a coefficient corresponding to the i-th higher term in the aspherical surface equation. The elements from the object plane to the image plane (imaging plane S19, which may also be understood as the photosensitive surface of the photosensitive element at the time of post-assembly) are sequentially arranged in the order of the elements from top to bottom in table 1, wherein the subject located on the object plane can form clear images on the imaging plane S19 of the optical system 10. The surface numbers 1 and 2 respectively indicate the object side surface S1 and the image side surface S2 of the first lens element L1, i.e., the surface with the smaller surface number is the object side surface and the surface with the larger surface number is the image side surface in the same lens element. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number on the optical axis. The first value of the lens in the "thickness" parameter row is the thickness of the lens on the optical axis, and the second value is the distance from the image side of the lens to the object side of the latter optical element on the optical axis. The optical axes of the lenses in the embodiment of the present application are on the same straight line, which is the optical axis of the optical system 10. Note that in the following embodiments, the infrared cut filter L9 may or may not be an element in the optical system 10.
In the first embodiment, the effective focal length f=4.38 mm, the f-number fno=1.85, the maximum field angle (i.e. diagonal viewing angle) fov=102.9°, and the optical total length ttl=6.95 mm of the optical system 10.
In addition, in the parameter tables of the following embodiments (first to sixth embodiments), the reference wavelength of the refractive index, abbe number, and focal length of each lens is 555nm. In addition, the relational computation and lens structure of each embodiment is based on lens parameters (e.g., table 1, table 2, table 3, table 4, etc.).
TABLE 1
TABLE 2
| Face number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| K | -1.5111 | -6.1427 | -13.8745 | -7.6187 | 3.3628 | -1.8636 | -0.3653 | -8.2092 |
| A4 | 0.0363 | 0.0365 | 0.1187 | -0.0257 | -0.0172 | -0.0482 | -0.0598 | -0.0214 |
| A6 | -0.0099 | -0.0132 | -0.1125 | 0.0157 | -0.0079 | -0.0336 | -0.0601 | 0.0073 |
| A8 | 0.0039 | 0.0088 | 0.1082 | -0.0118 | 0.0045 | 0.0588 | 0.0870 | -0.0391 |
| A10 | -0.0010 | -0.0035 | -0.0772 | 0.0037 | -0.0134 | -0.0603 | -0.0762 | 0.0304 |
| A12 | 0.0002 | 0.0009 | 0.0365 | 0.0003 | 0.0122 | 0.0330 | 0.0405 | -0.0091 |
| A14 | 0.0000 | -0.0001 | -0.0100 | -0.0011 | -0.0067 | -0.0097 | -0.0110 | 0.0010 |
| A16 | 0.0000 | 0.0000 | 0.0011 | 0.0003 | 0.0011 | 0.0011 | 0.0012 | 0.0000 |
| A18 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A20 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| Face number | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| K | 2.5029 | -9.5128 | -22.7856 | -27.6029 | -6.9216 | -23.6470 | -3.8168 | -3.0788 |
| A4 | -0.0431 | -0.0223 | -0.0077 | -0.1574 | 0.0305 | 0.1982 | -0.1119 | -0.0733 |
| A6 | 0.0754 | 0.0216 | 0.0475 | 0.1096 | -0.0041 | -0.1121 | 0.0258 | 0.0226 |
| A8 | -0.1436 | -0.0467 | -0.0498 | -0.0496 | -0.0100 | 0.0346 | -0.0040 | -0.0052 |
| A10 | 0.1203 | 0.0395 | 0.0266 | 0.0152 | 0.0049 | -0.0071 | 0.0006 | 0.0008 |
| A12 | -0.0517 | -0.0167 | -0.0084 | -0.0029 | -0.0011 | 0.0010 | -0.0001 | -0.0001 |
| A14 | 0.0113 | 0.0034 | 0.0016 | 0.0003 | 0.0001 | -0.0001 | 0.0000 | 0.0000 |
| A16 | -0.0010 | -0.0003 | -0.0002 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A18 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A20 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
Second embodiment
Referring to fig. 3 and 4, in the second embodiment, the optical system 10 includes, in order from the object side to the image side, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a stop STO, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Fig. 4 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the second embodiment, in which the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
The object side surface S1 of the first lens element L1 is concave at the paraxial region, and the image side surface S2 is convex at the paraxial region; the object side surface S1 is convex at the circumference and the image side surface S2 is concave at the circumference.
The object side surface S3 of the second lens element L2 is convex at the paraxial region, and the image side surface S4 is concave at the paraxial region; the object side surface S3 is concave at the circumference and the image side surface S4 is convex at the circumference.
The object side surface S5 of the third lens element L3 is concave at the paraxial region, and the image side surface S6 is convex at the paraxial region; the object side surface S5 is concave at the circumference and the image side surface S6 is convex at the circumference.
The object side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image side surface S8 is convex at the paraxial region; the object side surface S7 is convex at the circumference and the image side surface S8 is concave at the circumference.
The object side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image side surface S10 is convex at the paraxial region; the object side surface S9 is convex at the circumference and the image side surface S10 is concave at the circumference.
The object side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image side surface S12 is convex at the paraxial region; the object side surface S11 is concave at the circumference and the image side surface S12 is convex at the circumference.
The object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, and the image-side surface S14 is convex at the paraxial region; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
The object-side surface S15 of the eighth lens element L8 is convex at the paraxial region, and the image-side surface S16 is concave at the paraxial region; the object side surface S15 is concave at the circumference and the image side surface S16 is convex at the circumference.
In addition, the parameters of each lens of the optical system 10 in the second embodiment are shown in tables 3 and 4, wherein the definitions of each structure and parameter can be obtained in the first embodiment, and the description thereof is omitted herein.
TABLE 3 Table 3
TABLE 4 Table 4
The optical system 10 in this embodiment satisfies the following relationship:
third embodiment
Referring to fig. 5 and 6, in the third embodiment, the optical system 10 includes, in order from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a stop STO, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Fig. 6 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the third embodiment, in which the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
The object side surface S1 of the first lens element L1 is concave at the paraxial region, and the image side surface S2 is convex at the paraxial region; the object side surface S1 is convex at the circumference and the image side surface S2 is concave at the circumference.
The object side surface S3 of the second lens element L2 is convex at the paraxial region, and the image side surface S4 is concave at the paraxial region; the object side surface S3 is concave at the circumference and the image side surface S4 is convex at the circumference.
The object side surface S5 of the third lens element L3 is convex at the paraxial region, and the image side surface S6 is convex at the paraxial region; the object side surface S5 is concave at the circumference and the image side surface S6 is convex at the circumference.
The object side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image side surface S8 is convex at the paraxial region; the object side surface S7 is convex at the circumference and the image side surface S8 is concave at the circumference.
The object side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image side surface S10 is convex at the paraxial region; the object side surface S9 is convex at the circumference and the image side surface S10 is concave at the circumference.
The object side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image side surface S12 is convex at the paraxial region; the object side surface S11 is concave at the circumference and the image side surface S12 is convex at the circumference.
The object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, and the image-side surface S14 is convex at the paraxial region; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
The object-side surface S15 of the eighth lens element L8 is convex at the paraxial region, and the image-side surface S16 is concave at the paraxial region; the object side surface S15 is concave at the circumference, and the image side surface S16 is concave at the circumference.
In addition, the parameters of each lens of the optical system 10 in the third embodiment are shown in tables 5 and 6, wherein the definitions of each structure and parameter can be obtained in the first embodiment, and the description thereof is omitted herein.
TABLE 5
TABLE 6
The optical system 10 in this embodiment satisfies the following relationship:
fourth embodiment
Referring to fig. 7 and 8, in the fourth embodiment, the optical system 10 includes, in order from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a stop STO, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Fig. 8 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fourth embodiment, in which the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
The object side surface S1 of the first lens element L1 is concave at the paraxial region, and the image side surface S2 is convex at the paraxial region; the object side surface S1 is convex at the circumference and the image side surface S2 is concave at the circumference.
The object side surface S3 of the second lens element L2 is convex at the paraxial region, and the image side surface S4 is concave at the paraxial region; the object side surface S3 is concave at the circumference and the image side surface S4 is convex at the circumference.
The object side surface S5 of the third lens element L3 is convex at the paraxial region, and the image side surface S6 is convex at the paraxial region; the object side surface S5 is concave at the circumference and the image side surface S6 is convex at the circumference.
The object side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image side surface S8 is convex at the paraxial region; the object side surface S7 is convex at the circumference and the image side surface S8 is concave at the circumference.
The object side surface S9 of the fifth lens element L5 is convex at the paraxial region, and the image side surface S10 is convex at the paraxial region; the object side surface S9 is convex at the circumference and the image side surface S10 is concave at the circumference.
The object side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image side surface S12 is convex at the paraxial region; the object side surface S11 is concave at the circumference and the image side surface S12 is convex at the circumference.
The object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, and the image-side surface S14 is concave at the paraxial region; the object side surface S13 is convex at the circumference, and the image side surface S14 is convex at the circumference.
The object-side surface S15 of the eighth lens element L8 is convex at the paraxial region, and the image-side surface S16 is concave at the paraxial region; the object side surface S15 is convex at the circumference and the image side surface S16 is concave at the circumference.
In addition, the parameters of each lens of the optical system 10 in the fourth embodiment are given in tables 7 and 8, wherein the definition of each structure and parameter can be obtained in the first embodiment, and the description thereof is omitted herein.
TABLE 7
TABLE 8
| Face number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| K | -1.1630 | -5.5948 | -12.1402 | -6.8019 | 10.0000 | -1.7205 | -0.9802 | 7.5960 |
| A4 | 0.0336 | 0.0355 | 0.1040 | -0.0235 | -0.0201 | -0.0533 | -0.0689 | -0.0368 |
| A6 | -0.0088 | -0.0126 | -0.0878 | 0.0137 | -0.0045 | -0.0159 | 0.0076 | 0.0123 |
| A8 | 0.0033 | 0.0078 | 0.0791 | -0.0111 | -0.0042 | 0.0286 | -0.0131 | -0.0169 |
| A10 | -0.0008 | -0.0031 | -0.0548 | 0.0050 | -0.0019 | -0.0330 | -0.0004 | 0.0055 |
| A12 | 0.0001 | 0.0008 | 0.0259 | -0.0017 | 0.0033 | 0.0191 | 0.0077 | 0.0016 |
| A14 | 0.0000 | -0.0001 | -0.0073 | 0.0000 | -0.0027 | -0.0057 | -0.0034 | -0.0011 |
| A16 | 0.0000 | 0.0000 | 0.0009 | 0.0001 | 0.0004 | 0.0006 | 0.0005 | 0.0002 |
| A18 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A20 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| Face number | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| K | -12.4040 | 5.6791 | -27.7800 | -27.8830 | -8.1068 | -23.6470 | -4.3607 | -3.1332 |
| A4 | -0.0244 | 0.0167 | -0.0207 | -0.1669 | 0.0391 | 0.1808 | -0.1119 | -0.0735 |
| A6 | -0.0379 | -0.0443 | 0.0623 | 0.1239 | -0.0113 | -0.1074 | 0.0291 | 0.0232 |
| A8 | 0.0162 | 0.0089 | -0.0618 | -0.0612 | -0.0077 | 0.0338 | -0.0057 | -0.0055 |
| A10 | 0.0066 | 0.0113 | 0.0331 | 0.0205 | 0.0045 | -0.0070 | 0.0009 | 0.0009 |
| A12 | -0.0071 | -0.0080 | -0.0106 | -0.0042 | -0.0011 | 0.0010 | -0.0001 | -0.0001 |
| A14 | 0.0021 | 0.0019 | 0.0020 | 0.0005 | 0.0001 | -0.0001 | 0.0000 | 0.0000 |
| A16 | -0.0002 | -0.0002 | -0.0002 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A18 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A20 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
The optical system 10 in this embodiment satisfies the following relationship:
fifth embodiment
Referring to fig. 9 and 10, in the fifth embodiment, the optical system 10 includes, in order from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a stop STO, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Fig. 10 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the fifth embodiment, in which the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
The object side surface S1 of the first lens element L1 is concave at the paraxial region, and the image side surface S2 is convex at the paraxial region; the object side surface S1 is convex at the circumference and the image side surface S2 is concave at the circumference.
The object side surface S3 of the second lens element L2 is convex at the paraxial region, and the image side surface S4 is concave at the paraxial region; the object side surface S3 is concave at the circumference and the image side surface S4 is convex at the circumference.
The object side surface S5 of the third lens element L3 is convex at the paraxial region, and the image side surface S6 is convex at the paraxial region; the object side surface S5 is concave at the circumference and the image side surface S6 is convex at the circumference.
The object side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image side surface S8 is convex at the paraxial region; the object side surface S7 is concave at the circumference, and the image side surface S8 is concave at the circumference.
The object side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image side surface S10 is concave at the paraxial region; the object side surface S9 is convex at the circumference and the image side surface S10 is concave at the circumference.
The object side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image side surface S12 is convex at the paraxial region; the object side surface S11 is concave at the circumference and the image side surface S12 is convex at the circumference.
The object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, and the image-side surface S14 is convex at the paraxial region; the object side surface S13 is concave at the circumference and the image side surface S14 is convex at the circumference.
The object-side surface S15 of the eighth lens element L8 is convex at the paraxial region, and the image-side surface S16 is concave at the paraxial region; the object side surface S15 is convex at the circumference and the image side surface S16 is concave at the circumference.
In addition, the parameters of each lens of the optical system 10 in the fifth embodiment are shown in tables 9 and 10, wherein the definition of each structure and parameter can be obtained in the first embodiment, and the description thereof is omitted herein.
TABLE 9
Table 10
| Face number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| K | -1.2817 | -5.7810 | -11.6878 | -7.2294 | 3.3331 | -1.9182 | -1.6194 | -7.5380 |
| A4 | 0.0345 | 0.0353 | 0.1030 | -0.0232 | -0.0190 | -0.0489 | -0.0354 | 0.0163 |
| A6 | -0.0092 | -0.0121 | -0.0864 | 0.0143 | -0.0056 | -0.0262 | -0.0416 | -0.0782 |
| A8 | 0.0034 | 0.0075 | 0.0808 | -0.0138 | 0.0010 | 0.0383 | 0.0150 | 0.0752 |
| A10 | -0.0009 | -0.0029 | -0.0593 | 0.0088 | -0.0120 | -0.0341 | -0.0015 | -0.0529 |
| A12 | 0.0001 | 0.0008 | 0.0297 | -0.0046 | 0.0127 | 0.0161 | 0.0004 | 0.0238 |
| A14 | 0.0000 | -0.0001 | -0.0087 | 0.0010 | -0.0076 | -0.0042 | 0.0004 | -0.0057 |
| A16 | 0.0000 | 0.0000 | 0.0010 | 0.0000 | 0.0015 | 0.0004 | -0.0002 | 0.0006 |
| A18 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A20 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| Face number | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
| K | -5.1641 | -12.4040 | -27.7800 | -7.8830 | -8.6649 | -16.9991 | -4.0007 | -3.2604 |
| A4 | -0.0212 | -0.0025 | 0.0071 | -0.1753 | 0.0318 | 0.1881 | -0.1057 | -0.0647 |
| A6 | -0.1270 | -0.0735 | 0.0280 | 0.1295 | -0.0033 | -0.1010 | 0.0246 | 0.0187 |
| A8 | 0.1592 | 0.0591 | -0.0389 | -0.0639 | -0.0101 | 0.0293 | -0.0039 | -0.0040 |
| A10 | -0.0961 | -0.0194 | 0.0237 | 0.0214 | 0.0047 | -0.0056 | 0.0006 | 0.0006 |
| A12 | 0.0320 | 0.0016 | -0.0082 | -0.0044 | -0.0010 | 0.0007 | -0.0001 | -0.0001 |
| A14 | -0.0056 | 0.0004 | 0.0016 | 0.0005 | 0.0001 | -0.0001 | 0.0000 | 0.0000 |
| A16 | 0.0004 | -0.0001 | -0.0002 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A18 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
| A20 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 | 0.0000 |
The optical system 10 in this embodiment satisfies the following relationship:
Sixth embodiment
Referring to fig. 11 and 12, in the sixth embodiment, the optical system 10 includes, in order from the object side to the image side, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a stop STO, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. Fig. 12 includes a longitudinal spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical system 10 in the sixth embodiment, in which the astigmatism diagram and the distortion diagram are graphs at a wavelength of 555 nm.
The object side surface S1 of the first lens element L1 is concave at the paraxial region, and the image side surface S2 is convex at the paraxial region; the object side surface S1 is convex at the circumference and the image side surface S2 is concave at the circumference.
The object side surface S3 of the second lens element L2 is convex at the paraxial region, and the image side surface S4 is concave at the paraxial region; the object side surface S3 is concave at the circumference and the image side surface S4 is convex at the circumference.
The object side surface S5 of the third lens element L3 is convex at the paraxial region, and the image side surface S6 is convex at the paraxial region; the object side surface S5 is concave at the circumference and the image side surface S6 is convex at the circumference.
The object side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image side surface S8 is concave at the paraxial region; the object side surface S7 is concave at the circumference, and the image side surface S8 is concave at the circumference.
The object side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image side surface S10 is convex at the paraxial region; the object side surface S9 is convex at the circumference and the image side surface S10 is concave at the circumference.
The object side surface S11 of the sixth lens element L6 is concave at the paraxial region, and the image side surface S12 is convex at the paraxial region; the object side surface S11 is concave at the circumference and the image side surface S12 is convex at the circumference.
The object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, and the image-side surface S14 is convex at the paraxial region; the object side surface S13 is concave at the circumference and the image side surface S14 is convex at the circumference.
The object-side surface S15 of the eighth lens element L8 is convex at the paraxial region, and the image-side surface S16 is concave at the paraxial region; the object side surface S15 is convex at the circumference and the image side surface S16 is concave at the circumference.
In addition, the parameters of each lens of the optical system 10 in the sixth embodiment are given in tables 11 and 12, wherein the definition of each structure and parameter can be obtained in the first embodiment, and the description thereof is omitted herein.
TABLE 11
Table 12
The optical system 10 in this embodiment satisfies the following relationship:
referring to fig. 13, in one embodiment of the present application, the optical system 10 is assembled with the photosensitive element 210 to form the image capturing module 20, and the photosensitive element 210 is disposed on the image side of the eighth lens L8, i.e. on the image side of the optical system 10. Generally, the photosensitive surface of the photosensitive element 210 overlaps the imaging surface S19 of the optical system 10. An infrared cut filter L9 is also provided between the eighth lens L8 and the photosensitive element 210 in this embodiment. The photosensitive element 210 may be a CCD (Charge Coupled Device ) or CMOS (Complementary Metal Oxide Semiconductor, complementary metal oxide semiconductor). By adopting the optical system 10, the image pickup module 20 can have excellent image pickup quality.
In some embodiments, the distance between the photosensitive element 210 and each lens in the optical system 10 is relatively fixed, and the image capturing module 20 is a fixed focus module. In other embodiments, the focusing effect may be achieved by providing a driving mechanism such as a voice coil motor to enable relative movement of the photosensitive element 210 with respect to each lens in the optical system 10. Specifically, a coil electrically connected to the driving chip is disposed on the lens barrel assembled with each lens, and the camera module 20 is further provided with a magnet, so that the lens barrel is driven to move relative to the photosensitive element 210 under the action of magnetic force between the energized coil and the magnet, thereby achieving a focusing effect. In other embodiments, the optical zoom effect may also be achieved by providing a similar drive mechanism to drive movement of a portion of the lenses in the optical system 10.
Referring to fig. 14, some embodiments of the present application further provide an electronic device 30, and the camera module 20 is applied to the electronic device 30 to provide the electronic device 30 with a camera function. Specifically, the electronic device 30 includes a fixing member 310, and the camera module 20 is mounted on the fixing member 310, where the fixing member 310 may be a circuit board, a middle frame, or the like. The electronic device 30 may be, but is not limited to, a smart phone, a smart watch, an electronic book reader, a vehicle-mounted camera device, a monitoring device, a medical device (e.g., an endoscope), a tablet computer, a biometric device (e.g., a fingerprint recognition device or a pupil recognition device, etc.), a PDA (Personal DIGITAL ASSISTANT, a Personal digital assistant), an unmanned aerial vehicle, etc. Specifically, in some embodiments, the electronic device 30 is a smart phone, the smart phone includes a middle frame and a circuit board, the circuit board is disposed on the middle frame, the camera module 20 is mounted on the middle frame of the smart phone, and the photosensitive element 210 is electrically connected to the circuit board. The camera module 20 can be used as a front camera module or a rear camera module of the smart phone. By adopting the camera module 20 provided by the embodiment of the application, the electronic device 30 can have an excellent shooting function.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (8)
1. An optical system, comprising, in order from an object side to an image side:
a first lens element with refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
a second lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
A third lens element with positive refractive power having a convex image-side surface at a paraxial region;
a fourth lens element with negative refractive power having a concave object-side surface at a paraxial region;
A fifth lens element with refractive power;
a sixth lens element with negative refractive power having a concave object-side surface at a paraxial region;
a seventh lens element with positive refractive power having a convex object-side surface at a paraxial region; and
An eighth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
The optical system satisfies the following relationship:
tan(HFOV)≥1.242 ，TTL/Imgh＜1 .36，TTL/f＜1 .65；
wherein, HFOV is half of the maximum angle of view of the optical system, TTL is the distance between the object side surface of the first lens and the imaging surface of the optical system on the optical axis, imgh is half of the diagonal length of the effective imaging area of the optical system on the imaging surface, and f is the effective focal length of the optical system.
2. The optical system of claim 1, wherein the following relationship is satisfied:
2＜f/R16＜4；
wherein f is an effective focal length of the optical system, and R16 is a radius of curvature of the image side surface of the eighth lens element at the optical axis.
3. The optical system of claim 1, wherein the following relationship is satisfied:
FNO≤2；
wherein FNO is the f-number of the optical system.
4. The optical system of claim 1, wherein the following relationship is satisfied:
1＜SD12/SD21＜1 .4；
Wherein SD12 is the maximum effective half-caliber of the image side of the first lens; SD21 is the maximum effective half-caliber of the object side surface of the second lens.
5. The optical system of claim 1, wherein the following relationship is satisfied:
0＜T23/CT3＜0 .9；
wherein T23 is a distance between the image side surface of the second lens element and the object side surface of the third lens element on the optical axis, and CT3 is a thickness of the third lens element on the optical axis.
6. The optical system of any one of claims 1 to 5, wherein the object side surface and the image side surface of each lens in the optical system are aspherical surfaces.
7. An image capturing module comprising a photosensitive element and the optical system of any one of claims 1 to 6, wherein the photosensitive element is disposed on an image side of the optical system.
8. An electronic device, comprising a fixing member and the camera module set according to claim 7, wherein the camera module set is disposed on the fixing member.
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| WO2022011498A1 (en) * | 2020-07-13 | 2022-01-20 | 欧菲光集团股份有限公司 | Optical system, image capturing module, and electronic apparatus |
| CN111596446B (en) * | 2020-07-27 | 2020-10-27 | 常州市瑞泰光电有限公司 | Image pickup optical lens |
| CN111736310B (en) * | 2020-07-27 | 2020-11-27 | 诚瑞光学(常州)股份有限公司 | Camera optics |
| JP2022049359A (en) * | 2020-09-16 | 2022-03-29 | エスゼット ディージェイアイ テクノロジー カンパニー リミテッド | Lens system, image capturing device, and mobile body |
| CN112014952B (en) * | 2020-10-13 | 2020-12-29 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| CN112099201B (en) * | 2020-11-02 | 2021-01-26 | 瑞泰光学(常州)有限公司 | Image pickup optical lens |
| TWI776274B (en) | 2020-11-11 | 2022-09-01 | 大立光電股份有限公司 | Optical imaging lens system, image capturing unit and electronic device |
| CN112698494B (en) * | 2020-12-30 | 2022-04-26 | 诚瑞光学(苏州)有限公司 | Camera optics |
| CN113484983B (en) * | 2021-06-18 | 2023-09-05 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
| CN113741004B (en) * | 2021-08-13 | 2023-07-04 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
| CN116107070B (en) * | 2021-11-11 | 2025-07-01 | 浙江舜宇光学有限公司 | Optical camera lens |
| CN114994875B (en) * | 2022-08-04 | 2022-11-18 | 东莞市宇瞳光学科技股份有限公司 | Long-focus lens |
| CN116577909B (en) * | 2023-05-31 | 2025-08-29 | 浙江舜宇光学有限公司 | Optical imaging lens |
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