CN113281876B - Optical system, camera module, electronic equipment and car - Google Patents

Optical system, camera module, electronic equipment and car Download PDF

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Publication number
CN113281876B
CN113281876B CN202110465472.4A CN202110465472A CN113281876B CN 113281876 B CN113281876 B CN 113281876B CN 202110465472 A CN202110465472 A CN 202110465472A CN 113281876 B CN113281876 B CN 113281876B
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China
Prior art keywords
optical system
lens
lens element
image
convex
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CN113281876A (en
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党绪文
李明
刘彬彬
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Jiangxi Oufei Optics Co ltd
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Jiangxi Oufei Optics Co ltd
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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
    • 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
    • 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

Abstract

The invention relates to an optical system, a camera module, electronic equipment and an automobile. The optical system comprises a first lens with negative refractive power, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the object side surface of the second lens is a convex surface at a paraxial region; a third lens element with positive refractive power; the object side surface of the fourth lens element with positive refractive power is convex at a paraxial region; a fifth lens element with a convex object-side surface at a paraxial region; a sixth lens element with an image-side surface being convex at a position near the maximum effective aperture; the optical system satisfies the relationship: 28.0deg/mm < FOV/TTL < 40.0deg/mm; the FOV is the maximum field angle of the optical system, and 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. The optical system with the design can achieve both large viewing angle and miniaturization design.

Description

Optical system, camera module, electronic equipment and car
Technical Field
The present invention relates to the field of photography, and in particular, to an optical system, a camera module, an electronic device, and an automobile.
Background
In recent years, with the rapid increase in consumer demand, various electronic devices equipped with imaging lenses have been rapidly developed and popularized. Among them, electronic devices with a large shooting range have a great deal of demands in many fields such as sports shooting, global image capturing, safety pre-warning, etc. However, with the conventional electronic devices in the above fields, the size of the internal components tends to be excessively large, which makes it difficult to effectively reduce the thickness of the device, resulting in a limitation in the miniaturization design of the device. In particular, conventional imaging lenses having a large angle of view tend to be limited by conventional structural designs, which makes it difficult to achieve a good compression of their axial dimensions, and thus difficult to apply to electronic devices having severe restrictions on the element dimensions.
Disclosure of Invention
Accordingly, it is necessary to provide an optical system, an imaging module, an electronic device, and an automobile, aiming at the problem of how to achieve both a large viewing angle and a small size.
An optical system comprising, in order from an object side to an image side along an optical axis:
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a second lens element with refractive power having a convex object-side surface at a paraxial region;
a third lens element with positive refractive power;
a fourth lens element with positive refractive power having a convex object-side surface at a paraxial region;
a fifth lens element with refractive power having a convex object-side surface at a paraxial region;
a sixth lens element with refractive power having a convex image-side surface near the maximum effective aperture;
and the optical system satisfies the following relationship:
28.0deg/mm＜FOV/TTL＜40.0deg/mm；
the FOV is the maximum field angle of the optical system, and the 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.
In the above optical system, the first lens element has negative refractive power, and the object-side surface thereof is convex, and the image-side surface thereof is concave, while the object-side surface of the second lens element is convex at a paraxial region thereof, so that two lens elements closest to the object-side surface of the optical system are beneficial to deflecting incident light rays having a larger included angle with the optical axis. The third lens element and the fourth lens element each have positive refractive power, so that the incident light beam deflected by the object lens element can be timely adjusted to timely correct the aberration, and meanwhile, the positive refractive power is shared by the two lens elements, so that the problem of overcorrection caused by the fact that a single lens element bears a larger burden of positive refractive power is prevented. In addition, the fourth lens element with positive refractive power has a convex object-side surface and a convex object-side surface at a paraxial region, so that incident light rays corresponding to each field of view can be converged, and the converging distance of the incident light rays can be shortened. In addition, the image side surface of the sixth lens is designed to be a convex surface at the position close to the maximum effective aperture, so that the converging distance of the incident light corresponding to the edge view field can be further shortened, the plane type design of the fourth lens and the fifth lens is matched, the incident light can be deflected at a small angle, the distance between the converging surface of the incident light corresponding to each view field and the lens group is further shortened, and the total length of the effective compression optical system is further realized. The optical system with the design can achieve both large viewing angle and miniaturization design. When the optical system further meets the relation condition, the maximum field angle and the total optical length of the optical system with the refractive power and the surface design can be reasonably configured, so that the optical system further has wide-angle characteristics under the condition of keeping small size, the large-size limit of the traditional ultra-wide viewing angle system is broken through, and the ultra-wide shooting viewing angle can be obtained by the small-size optical system; in addition, the method can also prevent the excessively strong deflection of the incident light in the optical system caused by the excessively large ratio of the field angle to the total optical length, thereby being beneficial to inhibiting the aberration such as field curvature, astigmatism, distortion and the like of the marginal field of view.
In one embodiment, the optical system satisfies the relationship:
FOV＞180deg；
TTL＜6.5mm；
when the relation is met, the optical system has an ultra-wide angle design, the total length of the optical system is effectively controlled, and the large-size structure of the traditional system with an ultra-wide angle is avoided.
In one embodiment, the optical system satisfies the relationship:
0.5＜|f123/f456|＜2；
f123 is the combined focal length of the first lens, the second lens and the third lens, and f456 is the combined focal length of the fourth lens, the fifth lens and the sixth lens. When the relation is met, the combined focal length of the front lens group (the first lens to the third lens) and the rear lens group (the fourth lens to the sixth lens) of the optical system can be reasonably restrained, on one hand, the plane design of the first lens and the second lens can be matched to reasonably guide the incident light rays with a large angle, and excessive distortion and astigmatism are prevented from being introduced; meanwhile, the reasonable surface type change and refractive power distribution of the third lens element to the sixth lens element are matched, so that reasonable aberration compensation is also facilitated, the tolerance sensitivity of the optical system is reduced, and the image quality is improved.
In one embodiment, the optical system includes an aperture stop provided between the second lens and the fifth lens, and the optical system satisfies the relationship:
2.5＜f4*FNO/f＜40.0；
f4 is the effective focal length of the fourth lens, FNO is the aperture value of the optical system, and f is the effective focal length of the optical system. When the optical system further satisfies the design, good image quality performance and aberration correction effect can be obtained.
In one embodiment, the optical system satisfies the relationship:
FNO < 2.2. The optical system meeting the relation has a larger aperture, so that the system has a good diffraction limit, and the optical system matched with the optical system with the design can have a good refraction effect, so that the optical system still has excellent relative illumination and resolution under the wide-angle characteristic.
In one embodiment, the optical system satisfies the relationship:
f is less than 0.85mm; when the relation is satisfied, the depth of field of the optical system can be effectively increased, the sensitivity of the optical system to the object distance is reduced, the shooting range is wider, the definition is higher, and the optical system can obtain clear imaging of scenes under various object distances even if focusing operation is not performed.
In one embodiment, the optical system satisfies the relationship:
1.5＜IMGH/BF＜4.0；
BF＞0.85mm；
IMGH is the image height corresponding to the maximum field angle of the optical system, and BF is the distance between the image side surface of the sixth lens and the imaging surface of the optical system on the optical axis. When meeting the relation that BF > 0.85mm, can make the rear end of lens group of the optical system keep the greater distance from imaging surface, thus can offer the greater protective space of rear end of lens group of the optical system, also help to reduce the difficulty of assembly process at the same time, increase the production yield; in addition, the larger back focal length can reduce the difference between the maximum effective aperture of the sixth lens and the maximum effective aperture of the fifth lens, which is beneficial to reducing the difficulty of structural arrangement of the optical system and reducing the volume. When the relation of 1.5 < IMGH/BF < 4.0 is further satisfied, the optical system with the wide-angle design can be matched with the image sensor with high pixels, so that the optical system simultaneously satisfies the requirements of large viewing angle and high pixels, and meanwhile, the optical system has larger back focus, so that the universality of the optical system on the image sensor is improved, and the assembly difficulty is reduced.
In one embodiment, the optical system satisfies the relationship:
0＜|R62/f6|＜7；
r62 is a radius of curvature of an image side surface of the sixth lens element at the optical axis, and f6 is an effective focal length of the sixth lens element. The image side surface of the sixth lens is a convex surface at the position of the maximum effective aperture, which is beneficial to the design of the rear end of the lens barrel and the reservation of the dispensing glue groove. And when the relation is met, the surface shape of the image side surface of the sixth lens at the paraxial region can be reasonably restrained, so that the abrupt change degree of the edge surface shape is reduced, the surface shape inflection degree is reduced, and the risks of light leakage and stray light of incident light rays when the incident light rays pass through the sixth lens can be well avoided. With the different distribution of the refractive indexes of the fifth lens and the sixth lens, the surface type matching relationship of the fifth lens and the sixth lens is changed correspondingly, but when the relationship is satisfied, the optical system can still obtain good aberration compensation effect and good image quality.
In one embodiment, the optical system satisfies the relationship:
0＜|R51/R61|＜48；
R51＞1.1mm；
r51 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, and R61 is a radius of curvature of the object side surface of the sixth lens element at the optical axis. The object side surface of the fifth lens is convex near the optical axis, and when R51 is more than 1.1mm, the surface shape near the optical axis can be prevented from being changed drastically, so that the surface shape near the optical axis is in smooth transition, on one hand, the deflection degree of marginal view field rays when passing through the fifth lens is reduced, on the other hand, the tolerance sensitivity of the object side surface of the fifth lens can be effectively controlled, and the phenomenon of illumination inflection of final imaging is avoided. When the relation of 0 < |R51/R61| < 48 is further satisfied, the object side surface types of the fifth lens and the sixth lens can be reasonably configured, chromatic aberration, astigmatism and distortion can be well corrected, and the system resolution is improved.
In one embodiment, the optical system satisfies the relationship:
0.4＜(CT45+CT56)/CT34＜3.5；
CT34 is the distance between the image side of the third lens element and the object side of the fourth lens element on the optical axis, CT45 is the distance between the image side of the fourth lens element and the object side of the fifth lens element on the optical axis, and CT56 is the distance between the image side of the fifth lens element and the object side of the sixth lens element on the optical axis. When the relation is satisfied, the third lens to the sixth lens have higher space compactness, and the total length of the whole optical system is smaller.
In one embodiment, the optical system satisfies the relationship:
47.0＜V3+V5＜80.0；
v3 is the Abbe number of the third lens, and V5 is the Abbe number of the fifth lens. When the relation is met, chromatic aberration of an edge view field of the wide-angle system can be properly corrected, color shift of large-angle view field imaging is avoided, and the integral imaging stability of the system is improved.
An image pickup module comprising an image sensor and the optical system of any one of the above, wherein the image sensor is arranged on the image side of the optical system. By adopting the optical system, the camera module can take account of the performances of small-size structure and wide-angle shooting.
An electronic device comprises a fixing piece and the camera shooting module, wherein the camera shooting module is arranged on the fixing piece. By adopting the camera shooting module, the occupied space of the module in the electronic equipment is reduced, the ultrathin design of the equipment is facilitated, and meanwhile, the equipment can obtain the wide-angle shooting capability, so that a wider-range object space scene can be obtained.
An automobile comprises a mounting part and the image pickup equipment, wherein the image pickup equipment is arranged on the mounting part. By adopting the electronic equipment, a driver or a vehicle-mounted system can acquire road condition information of a larger range around the automobile.
Drawings
Fig. 1 is a schematic structural diagram of an optical system according to a first embodiment of the present application;
FIG. 2 includes a longitudinal spherical aberration diagram, an astigmatic diagram, and a distortion diagram of the optical system in the first embodiment;
fig. 3 is a schematic structural diagram of an optical system according to a second embodiment of the present application;
FIG. 4 includes a longitudinal spherical aberration diagram, an astigmatic diagram, and a distortion diagram of the optical system in the second embodiment;
fig. 5 is a schematic structural diagram of an optical system according to a third embodiment of the present application;
FIG. 6 includes a longitudinal spherical aberration diagram, an astigmatic diagram, and a distortion diagram of an optical system in a third embodiment;
fig. 7 is a schematic structural view of an optical system according to a fourth embodiment of the present application;
fig. 8 includes a longitudinal spherical aberration diagram, an astigmatic diagram, and a distortion diagram of the optical system in the fourth embodiment;
fig. 9 is a schematic structural view of an optical system according to a fifth embodiment of the present application;
fig. 10 includes a longitudinal spherical aberration diagram, an astigmatic diagram, and a distortion diagram of the optical system in the fifth embodiment;
fig. 11 is a schematic structural view of an optical system according to a sixth embodiment of the present application;
Fig. 12 includes a longitudinal spherical aberration diagram, an astigmatic diagram, 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 disclosure;
fig. 14 is a schematic structural diagram of an electronic device according to an embodiment of the present application;
fig. 15 is a schematic structural diagram of an automobile according to an embodiment of the present application.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the invention, whereby the invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "thickness," "upper," "front," "rear," "axial," "radial," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
It will be understood that when an element is referred to as being "fixed" or "disposed" on 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.
Referring to fig. 1, in an embodiment of the present application, an optical system 10 includes, in order from an object side to an image side along an optical axis 101: the first lens element L1 with negative refractive power, the second lens element L2 with positive or negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with positive or negative refractive power, and the sixth lens element L6 with positive or negative refractive power. The optical axes of the six lenses are in the same straight line, i.e., the optical axis 101 of the optical system 10. Each lens in the optical system 10 may be assembled in a lens barrel to form an imaging lens.
The first lens element L1 has an object-side surface S1 and an image-side surface S2, the second lens element L2 has an object-side surface S3 and an image-side surface S4, the third lens element L3 has an object-side surface S5 and an image-side surface S6, the fourth lens element L4 has an object-side surface S7 and an image-side surface S8, the fifth lens element L5 has an object-side surface S9 and an image-side surface S10, and the sixth lens element L6 has an object-side surface S11 and an image-side surface S12. The optical system 10 further has an imaging surface S13, and the imaging surface S13 is located on the image side of the sixth lens L6. Generally, the imaging surface S13 of the optical system 10 coincides with the photosensitive surface of the image sensor, and incident light rays at infinity from the central field of view are sequentially adjusted by the lenses of the optical system 10 and then converged on the imaging surface S13.
In the embodiment of the application, the object-side surface S1 of the first lens element L1 is convex, and the image-side surface S2 is concave; the object side surface S3 of the second lens element L2 is convex at a paraxial region; the object side surface S7 of the fourth lens element L4 is convex at a paraxial region; the object side surface S9 of the fifth lens element L5 is convex at a paraxial region; the image-side surface S12 of the sixth lens element L6 is convex at a position near the maximum effective aperture. When describing that the lens surface has a certain profile at the paraxial region, i.e. the lens surface has such a profile near the optical axis 101; when describing that the lens surface has a certain profile near the maximum effective aperture, i.e. in the direction from the center to the edge, the lens surface has such a profile near the maximum effective aperture.
In the optical system 10 provided in the embodiment of the present disclosure, the first lens element L1 has negative refractive power, the object-side surface S1 thereof is convex, the image-side surface S2 thereof is concave, and the object-side surface S3 of the second lens element L2 is convex at a paraxial region thereof, so that two lens elements closest to the object-side surface of the optical system 10 are beneficial to deflecting incident light beams having larger angles with the optical axis. The third lens element L3 and the fourth lens element L4 each have positive refractive power, so that the incident light beam deflected by the object lens element can be timely adjusted to correct the aberration in time, and the positive refractive power can be shared between the two lens elements, so that the problem of overcorrection caused by a single lens element bearing a larger burden of positive refractive power is prevented. In addition, the fourth lens element L4 with positive refractive power has a convex object-side surface S7 and a convex object-side surface S9 at a paraxial region thereof, so as to converge incident light rays corresponding to each field of view, thereby shortening the converging distance of the incident light rays. In addition, by designing the image side surface S12 of the sixth lens element L6 to be convex at the position near the maximum effective aperture, the converging distance of the incident light corresponding to the marginal field of view can be further shortened, and by matching the surface designs of the fourth lens element L4 and the fifth lens element L5, the incident light can be deflected at a small angle, and the distance between the converging surface of the incident light corresponding to each field of view and the lens group can be further shortened, thereby achieving the effect of effectively compressing the total length of the optical system 10. The optical system 10 having the above design can achieve both a large viewing angle and a compact design.
Further, the optical system 10 provided in the embodiment of the present application further satisfies the relationship: 28.0deg/mm < FOV/TTL < 40.0deg/mm; the FOV is the maximum angle of view of the optical system 10, and TTL is the distance between the object side surface S1 of the first lens L1 and the imaging surface S13 of the optical system 10 on the optical axis 101. When the optical system 10 further satisfies the above-mentioned relational conditions, the maximum angle of view and the total optical length of the optical system 10 having the above-mentioned refractive power and surface-type design can be reasonably configured, so that the optical system 10 further has wide-angle characteristics while maintaining a small size, breaks through the large-size limitation of the conventional ultra-wide viewing angle system, and the small-size optical system 10 can obtain an ultra-wide photographing viewing angle; in addition, the incidence light is prevented from being excessively deflected in the optical system 10 due to the excessively large matching of the angle of view and the total optical length, so that the aberration such as curvature of field, astigmatism, distortion and the like of the marginal view can be favorably suppressed. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 29, 29.3, 29.5, 32, 35, 37, 37.5, 38, or 38.5, in deg/mm.
Furthermore, in some embodiments, the optical system 10 also satisfies at least one of the following relationships, and may possess the corresponding technical effects when either relationship is satisfied:
FOV > 180deg; TTL < 6.5mm; when these two relationships are satisfied, the optical system 10 will have an ultra-wide angle design, and the overall length of the optical system 10 is effectively controlled, avoiding the large-sized structure of the conventional system having an ultra-wide angle of view. It should be noted that, when the image sensor is assembled, the FOV can also be understood as the maximum field angle of the optical system 10 corresponding to the diagonal direction of the rectangular effective pixel area of the image sensor.
0.5 < |f123/f456| < 2; f123 is the combined focal length of the first lens L1, the second lens L2 and the third lens L3, and f456 is the combined focal length of the fourth lens L4, the fifth lens L5 and the sixth lens L6. When the relationship is satisfied, the combined focal length of the front lens group (the first lens L1 to the third lens L3) and the rear lens group (the fourth lens L4 to the sixth lens L6) of the optical system 10 can be reasonably constrained, so that on one hand, the plane-type designs of the first lens L1 and the second lens L2 can be matched to reasonably guide the incident light rays with a large angle, and excessive distortion and astigmatism are avoided; meanwhile, the reasonable surface shape change and refractive power distribution of the third lens element L3 to the sixth lens element L6 are matched, so that reasonable aberration compensation is also facilitated, and the tolerance sensitivity of the optical system 10 is reduced and the image quality is improved. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 0.65, 0.7, 0.8, 0.9, 1.1, 1.3, 1.35, 1.38, or 1.4.
F4 is more than 2.5 and FNO/f is less than 40.0; f4 is the effective focal length of the fourth lens L4, FNO is the aperture value of the optical system 10, and f is the effective focal length of the optical system 10. At this time, the optical system 10 includes an aperture stop STO, which is provided between the second lens L2 and the fifth lens L5. When the optical system 10 satisfies the design, good image quality performance and aberration correction effect can be obtained. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 2.8, 3.1, 3.5, 4, 5.7, 6.5, 7.3, 14, 26, 31, 35, or 37.
FNO < 2.2. The optical system 10 satisfying the relationship has a large aperture, so that the system has a good diffraction limit, and the optical system 10 having the above design can have a good refraction effect, so that the optical system 10 still has a good relative illuminance and resolution under the wide-angle characteristic.
f is less than 0.85mm; when this relationship is satisfied, the depth of field of the optical system 10 can be increased, the sensitivity of the optical system 10 to the object distance can be reduced, the photographing range can be wider, and the sharpness can be higher, and the optical system 10 can obtain clear images of scenes at various object distances even without performing a focusing operation.
1.5 < IMGH/BF < 4.0; BF > 0.85mm; IMGH is the image height corresponding to the maximum field angle of the optical system 10, and BF is the distance between the image side surface S12 of the sixth lens L6 and the imaging surface S13 of the optical system 10 on the optical axis 101. IMGH can also be understood as the diagonal length of the rectangular effective imaging area on the imaging surface S13. When the image sensor is assembled, imgh can also be understood as the distance from the center to the diagonal edge of the rectangular effective pixel area of the image sensor, and the diagonal direction of the effective imaging area is parallel to the diagonal direction of the rectangular effective pixel area. When meeting the relationship that BF > 0.85mm, can make the rear end of lens group of the optical system 10 keep a larger distance from imaging surface S13, thus can offer the optical system 10 lens group rear end a larger protective space, also help to reduce the difficulty of the assembly process at the same time, increase the production yield; in addition, the larger back focus can reduce the difference between the maximum effective aperture of the sixth lens L6 and the maximum effective aperture of the fifth lens L5, which is advantageous in reducing the difficulty in structural arrangement and the reduction in volume of the optical system 10. When the relation of 1.5 < IMGH/BF < 4.0 is further satisfied, the optical system 10 with the wide-angle design can be matched with the image sensor with high pixels, so that the optical system 10 can simultaneously satisfy the requirements of large viewing angle and high pixels, and meanwhile, the universality of the optical system 10 on the image sensor is improved and the assembly difficulty is reduced due to the fact that the optical system 10 has larger back focus. In some embodiments, the IMGH/BF relationship satisfied by the optical system 10 may be specifically 1.98, 2.05, 2.2, 2.5, 2.8, 3, 3.4, 3.6, 3.75, or 3.8.
0 < |R62/f6| < 7; r62 is a radius of curvature of the image side surface S12 of the sixth lens element L6 at the optical axis 101, and f6 is an effective focal length of the sixth lens element L6. The image side surface S12 of the sixth lens L6 is convex at the maximum effective aperture, which is beneficial to design of the rear end of the lens barrel and reservation of the dispensing slot. And when the relation is met, the surface shape of the image side surface S12 of the sixth lens L6 at the paraxial region can be reasonably restrained, so that the abrupt change degree of the edge surface shape is reduced, the surface shape inflection degree is reduced, and the risks of light leakage and stray light when incident light passes through the sixth lens L6 can be well avoided. With the different distribution of refractive indexes of the fifth lens L5 and the sixth lens L6, the surface matching relationship of the fifth lens L5 and the sixth lens L6 is changed accordingly, but when the relationship is satisfied, the optical system 10 can still obtain a good aberration compensation effect and a good image quality. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 1.15, 1.3, 1.6, 2, 2.7, 3.3, 4, 5.2, 5.7, or 6.0.
0 < |R51/R61| < 48; r51 is more than 1.1mm; r51 is a radius of curvature of the object side surface S9 of the fifth lens element L5 at the optical axis 101, and R61 is a radius of curvature of the object side surface S11 of the sixth lens element L6 at the optical axis 101. The object side surface S9 of the fifth lens element L5 is convex near the optical axis, and when R51 is greater than 1.1mm, the surface shape near the optical axis can be prevented from being changed drastically, so that the surface shape near the optical axis is in smooth transition, which is beneficial to reducing the deflection degree of the marginal view field light ray when passing through the fifth lens element L5, and can effectively control the tolerance sensitivity of the object side surface S9 of the fifth lens element L5, thereby avoiding the phenomenon of illumination contrast in final imaging. When the relation of 0 < |R51/R61| < 48 is further satisfied, the object side surface types of the fifth lens L5 and the sixth lens L6 can be reasonably configured, chromatic aberration, astigmatism and distortion can be well corrected, and the system resolution is improved. In some embodiments, the R51/R61 relationship satisfied by the optical system 10 may specifically be 1.2, 1.6, 2, 2.5, 3, 3.3, 3.5, 3.8, 12.5, 43, or 45.
0.4 < (CT45+CT56)/CT 34 < 3.5; CT34 is a distance on the optical axis 101 from the image side surface S6 of the third lens element L3 to the object side surface S7 of the fourth lens element L4, CT45 is a distance on the optical axis 101 from the image side surface S8 of the fourth lens element L4 to the object side surface S9 of the fifth lens element L5, and CT56 is a distance on the optical axis 101 from the image side surface S10 of the fifth lens element L5 to the object side surface S11 of the sixth lens element L6. When this relationship is satisfied, a high space compactness is provided between the third lens L3 to the sixth lens L6, and thus the overall length of the entire optical system 10 is made small. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 0.5, 0.56, 0.64, 0.75, 0.9, 1, 1.2, 2, 2.4, 2.7, or 3.
47.0 < V3+ V5 < 80.0; v3 is the abbe number of the third lens L3, and V5 is the abbe number of the fifth lens L5. When the relation is met, chromatic aberration of an edge view field of the wide-angle system can be properly corrected, color shift of large-angle view field imaging is avoided, and the integral imaging stability of the system is improved. In some embodiments, the relationship satisfied by the optical system 10 may specifically be 48, 50, 54, 59, 64, 68, 73, 75, or 78.
It should be noted that the abbe number, the effective focal length, and the combined focal length in the above relational conditions have a reference wavelength of 587.56nm, and the effective focal length and the combined focal length refer to at least the values of the corresponding lens or lens group at the paraxial region. And the above relational conditions and the technical effects thereof are directed to the six-piece optical system 10 having the above lens design. If the lens design (lens number, refractive power configuration, surface configuration, etc.) of the optical system 10 cannot be ensured, it is difficult to ensure that the optical system 10 still has the corresponding technical effects while satisfying these relationships, and even significant degradation of the image capturing performance may occur.
In some embodiments, the optical system 10 includes an aperture stop STO, which may be disposed between two adjacent lenses of the second lens L2 and the fifth lens L5.
In some embodiments, at least one lens in the optical system 10 has an aspherical surface profile, i.e., when at least one side surface (object side or image side) of the lens is aspherical, the lens may be said to have an aspherical surface profile. Specifically, the object side surface and the image side surface of each lens can be designed to be aspherical. The aspheric surface type arrangement can further help the optical system 10 to eliminate aberration more effectively, improve imaging quality, and facilitate miniaturization design of the optical system 10, so that the optical system 10 can have excellent optical effects while maintaining miniaturization design. Of course, in other embodiments, at least one lens of the optical system 10 may have a spherical surface shape, and the design of the spherical surface shape may reduce the difficulty of manufacturing the lens and reduce the manufacturing cost. It should be noted that there may be some deviation in the ratio of the dimensions of the thickness, surface curvature, etc. of each lens in the drawings. It should also be noted that when the object side or image side of a lens is aspheric, the surface may have a curvature, and the shape of the surface from center to edge will change.
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 tangential plane of the surface at the optical axis, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric surface at the optical axis, k is a conic coefficient, and Ai is a higher order term coefficient corresponding to the i-th order higher order term in the aspheric surface formula.
On the other hand, in some embodiments, the material of at least one lens in the optical system 10 is Plastic (PC), and the Plastic material may be polycarbonate, gum, or the like. In some embodiments, the material of at least one lens in the optical system 10 is Glass (GL). The lens with plastic material can reduce the production cost of the optical system 10, while the lens with glass material can withstand higher or lower temperature and has excellent optical effect and better stability. In some embodiments, at least two lenses of different materials may be disposed in the optical system 10, for example, a combination of glass lenses and plastic lenses may be used, but the specific configuration relationship may be determined according to practical needs, which is not meant to be exhaustive.
The optical system 10 of the present application is illustrated by the following more specific examples:
First embodiment
Referring to fig. 1, in the first embodiment, the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture stop STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. The surface shape of each lens in the optical system 10 is as follows:
the object side surface S1 of the first lens element L1 is convex at a paraxial region, and the image side surface S2 is concave at a paraxial region; the object side surface S1 is convex near the maximum effective aperture, and the image side surface S2 is concave near the maximum effective aperture.
The object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 is concave at a paraxial region; the object side surface S3 is convex near the maximum effective aperture, and the image side surface S4 is concave near the maximum effective aperture.
The third lens element L3 has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region; the object side surface S5 is convex near the maximum effective aperture, and the image side surface S6 is concave near the maximum effective aperture.
The fourth lens element L4 has a convex object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the object side surface S7 is convex at the position near the maximum effective aperture, and the image side surface S8 is convex at the position near the maximum effective aperture.
The fifth lens element L5 has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region; the object side surface S9 is concave at the near maximum effective aperture, and the image side surface S10 is convex at the near maximum effective aperture.
The object side surface S11 of the sixth lens element L6 is convex at a paraxial region, and the image side surface S12 is convex at a paraxial region; the object side surface S11 is convex at the near maximum effective aperture, and the image side surface S12 is convex at the near maximum effective aperture.
In the first embodiment, each of the first lens L1 to the sixth lens L6 has an aspherical surface, and each lens is made of plastic.
The lens parameters of the optical system 10 in the first embodiment are presented in table 1 below. The elements from the object side to the image side of the optical system 10 are sequentially arranged in the order from top to bottom of table 1, with the aperture stop characterizing the aperture stop STO. The filter 110 may be part of the optical system 10 or may be removable from the optical system 10, but the overall optical length of the optical system 110 remains the same after the filter 110 is removed. The filter 110 may be an infrared cut filter. In table 1, the Y radius is the radius of curvature of the corresponding surface of the lens at the optical axis 101, and the Y aperture is the maximum effective aperture (maximum effective clear aperture) of the corresponding lens surface in the Y direction. The absolute value of the first value of the lens in the "thickness" parameter row is the thickness of the lens on the optical axis 101 (for example, the surface with the plane number 1 in table 1 represents the object side surface of the first lens, the surface with the plane number 2 represents the image side surface of the first lens), and the absolute value of the second value is the distance from the image side surface of the lens to the subsequent optical element (lens or diaphragm) on the optical axis 101, wherein the thickness parameter of the diaphragm represents the distance from the diaphragm surface to the object side surface of the adjacent lens on the image side on the optical axis 101. The refractive index, abbe number, and focal length (effective focal length) of each lens in the table are 587.56nm, and the numerical units of Y radius, thickness, focal length (effective focal length), and Y aperture are millimeters (mm). In addition, the parameter data and the lens surface type structure used for the relational computation in the following embodiments are based on the data in the lens parameter table in the corresponding embodiments.
TABLE 1
As can be seen from table 1, the optical system 10 in the first embodiment has an effective focal length f of 0.74mm, an f-number FNO of 2.18, an optical total length TTL of 5mm, and a maximum field angle FOV of 187 °, and the optical system 10 has an ultra-wide angle characteristic.
Table 2 below presents the aspherical coefficients of the corresponding lens surfaces in table 1, where K is a conic coefficient and Ai is a coefficient corresponding to the i-th order higher order term in the aspherical surface type formula.
TABLE 2
In the first embodiment, the optical system 10 satisfies the following relationships:
FOV/TTL = 37.4deg/mm; when the optical system 10 satisfies the relational condition, the maximum angle of view and the total optical length of the optical system 10 with the refractive power and the planar design can be reasonably configured, so that the optical system 10 further has wide angle characteristics under the condition of keeping small size, breaks through the large size limitation of the traditional ultra wide viewing angle system, and the small size optical system 10 can obtain an ultra wide shooting viewing angle; in addition, the incidence light is prevented from being excessively deflected in the optical system 10 due to the excessively large matching of the angle of view and the total optical length, so that the aberration such as curvature of field, astigmatism, distortion and the like of the marginal view can be favorably suppressed.
I f123/f456 i=0.84; when the relationship is satisfied, the combined focal length of the front lens group (the first lens L1 to the third lens L3) and the rear lens group (the fourth lens L4 to the sixth lens L6) of the optical system 10 can be reasonably constrained, so that on one hand, the plane-type designs of the first lens L1 and the second lens L2 can be matched to reasonably guide the incident light rays with a large angle, and excessive distortion and astigmatism are avoided; meanwhile, the reasonable surface shape change and refractive power distribution of the third lens element L3 to the sixth lens element L6 are matched, so that reasonable aberration compensation is also facilitated, and the tolerance sensitivity of the optical system 10 is reduced and the image quality is improved.
f4 x FNO/f=2.78; when the optical system 10 satisfies the design, good image quality performance and aberration correction effect can be obtained.
Fno=2.18. The optical system 10 satisfying the relationship has a large aperture, so that the system has a good diffraction limit, and the optical system 10 having the above design can have a good refraction effect, so that the optical system 10 still has a good relative illuminance and resolution under the wide-angle characteristic.
f=0.74 mm; when this relationship is satisfied, the optical system 10 can have a large depth of field, can reduce sensitivity to object distances, can have a wider shooting range, and can have a higher definition, and the optical system 10 can obtain clear images of scenes at various object distances even without performing a focusing operation.
IMGH/bf=1.92; bf=1.343 mm; when the arrangement is satisfied, the rear end of the lens group of the optical system 10 can be kept at a larger distance from the imaging surface S13, namely, a relatively larger back focus is provided, so that a larger protection space can be provided for the rear end of the lens group of the optical system 10, the difficulty of an assembly process is reduced, and the production yield is increased; in addition, the larger back focus can reduce the difference between the maximum effective aperture of the sixth lens L6 and the maximum effective aperture of the fifth lens L5, which is advantageous in reducing the difficulty in structural arrangement and the reduction in volume of the optical system 10. Further, the optical system 10 with the wide-angle design can be matched with the image sensor with high pixels, so that the optical system 10 can meet the requirements of large viewing angle and high pixels at the same time, and meanwhile, the universality of the optical system 10 on the image sensor is improved and the assembly difficulty is reduced due to the large back focus.
R62/f6|=1.47; when the relation is satisfied, the surface shape of the image side surface S12 of the sixth lens L6 at the paraxial region can be reasonably constrained, so that the abrupt change degree of the edge surface shape is reduced, the surface shape inflection degree is reduced, and the risks of light leakage and stray light of incident light rays when the incident light rays pass through the sixth lens L6 can be well avoided.
R51/r61|=3.05; r51= 3.077mm; when the design is met, the surface type near the optical axis can be prevented from being changed drastically, so that the surface type near the optical axis is in smooth transition, on one hand, the deflection degree of marginal view field rays when passing through the fifth lens L5 is reduced, on the other hand, the tolerance sensitivity of the object side surface S9 of the fifth lens L5 can be effectively controlled, and the phenomenon of illumination inflection of final imaging is avoided. In addition, the object side surface types of the fifth lens element L5 and the sixth lens element L6 can be reasonably configured, chromatic aberration, astigmatism and distortion can be well corrected, and the system resolution is improved.
(CT 45+ CT 56)/CT 34 = 0.46. When this relationship is satisfied, a high space compactness is provided between the third lens L3 to the sixth lens L6, and thus the overall length of the entire optical system 10 is made small.
V3+v5= 47.03; when the relation is met, chromatic aberration of an edge view field of the wide-angle system can be properly corrected, color shift of large-angle view field imaging is avoided, and the integral imaging stability of the system is improved.
On the other hand, fig. 2 includes a longitudinal spherical aberration diagram, an astigmatism diagram, 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 587nm. The longitudinal spherical aberration diagram (Longitudinal Spherical Aberration) shows the focus deviation of light rays with different wavelengths after passing through the lens. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the distance (in mm) from the imaging plane to the intersection of the light ray and the optical axis. As can be seen from the longitudinal spherical aberration diagram, the degree of focus deviation of the light beams with the respective wavelengths in the first embodiment tends to be uniform, and the diffuse spots or the halos in the imaging picture are effectively suppressed. Fig. 2 also includes a field curvature map (Astigmatic Field Curves) of the optical system 10, wherein the S-curve represents the sagittal field curvature at 587nm and the T-curve represents the meridional field curvature at 587nm. As can be seen from the figure, the field curvature of the optical system is small, the maximum field curvature is controlled within ±0.02mm, the degree of curvature of the image plane is effectively suppressed, the sagittal field curvature and meridional field curvature under each field tend to be consistent, and the astigmatism of each field is better controlled, so that the center to the edge of the field of the optical system 10 can be seen to have clear imaging.
Second embodiment
Referring to fig. 3, in the second embodiment, the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, an aperture stop STO, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. The surface shape of each lens in the optical system 10 is as follows:
the object side surface S1 of the first lens element L1 is convex at a paraxial region, and the image side surface S2 is concave at a paraxial region; the object side surface S1 is convex near the maximum effective aperture, and the image side surface S2 is concave near the maximum effective aperture.
The object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 is convex at a paraxial region; the object side surface S3 is concave near the maximum effective aperture, and the image side surface S4 is convex near the maximum effective aperture.
The third lens element L3 has a concave object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region; the object side surface S5 is concave at the position near the maximum effective aperture, and the image side surface S6 is convex at the position near the maximum effective aperture.
The fourth lens element L4 has a convex object-side surface S7 at a paraxial region and a concave image-side surface S8 at a paraxial region; the object side surface S7 is concave at the position near the maximum effective aperture, and the image side surface S8 is convex at the position near the maximum effective aperture.
The fifth lens element L5 has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region; the object side surface S9 is concave at the position near the maximum effective aperture, and the image side surface S10 is concave at the position near the maximum effective aperture.
The object side surface S11 of the sixth lens element L6 is convex at a paraxial region, and the image side surface S12 is convex at a paraxial region; the object side surface S11 is convex at the near maximum effective aperture, and the image side surface S12 is convex at the near maximum effective aperture.
The parameters of each lens of the optical system 10 in the second embodiment are given in tables 3 and 4, wherein the names and parameters of each element are defined in the first embodiment, and are not described herein.
TABLE 3 Table 3
TABLE 4 Table 4
Face number 1 2 3 4 6 7
K -1.197E+01 -8.795E-01 -9.900E+01 -1.576E+01 -7.111E+00 -1.750E+00
A4 -4.074E-03 5.997E-02 -2.017E-01 -2.746E-01 -9.982E-01 -6.909E-01
A6 2.086E-04 -1.326E-01 -1.501E-01 1.955E-01 -9.063E-02 -1.718E+00
A8 1.779E-04 4.120E-01 -1.124E-01 -2.392E-01 -1.458E+01 3.018E+00
A10 -1.292E-05 -3.511E-01 1.623E-01 1.124E-01 -6.379E+00 -1.720E+01
A12 1.384E-22 -7.764E-14 2.665E-17 2.674E-17 2.674E-17 2.674E-17
A14 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00
A16 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00
A18 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00
A20 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00 0.000E+00
Face number 8 9 10 11 12 13
K 9.979E-01 -9.900E+01 -9.900E+01 2.035E+00 -2.155E+01 -8.007E-01
A4 -3.761E-01 -1.948E+00 -2.868E+00 -5.122E-02 1.289E+00 4.615E-01
A6 -2.397E-01 -6.163E-01 3.468E+00 -8.480E+00 -8.850E+00 4.630E-01
A8 1.193E+00 1.672E+00 -7.523E+00 5.833E+01 2.986E+01 7.208E-01
A10 -5.151E+00 3.171E+00 2.529E+02 -2.338E+02 -5.331E+01 -4.400E+00
A12 2.674E-17 2.738E-17 -2.334E+03 6.498E+02 4.934E+01 6.010E+00
A14 0.000E+00 0.000E+00 1.055E+04 -1.279E+03 -1.885E+01 -2.841E+00
A16 0.000E+00 0.000E+00 -2.701E+04 1.655E+03 0.000E+00 0.000E+00
A18 0.000E+00 0.000E+00 3.809E+04 -1.233E+03 0.000E+00 0.000E+00
A20 0.000E+00 0.000E+00 -2.300E+04 3.931E+02 0.000E+00 0.000E+00
The optical system 10 in this embodiment satisfies the following relationship:
FOV/TTL(deg/mm) 36.963 |R62/f6| 0.66
|f123/f456| 0.708 |R51/R61| 13.698
f4*FNO/f 37.494 R51(mm) 35.61
IMGH/BF 2.967 (CT45+CT56)/CT34 0.759
BF(mm) 0.886 V3+V5 79.829
as can be seen from the aberration diagrams in fig. 4, the longitudinal spherical aberration, field curvature, astigmatism and distortion of the optical system 10 are well controlled, wherein the meridional field curvature and sagittal field curvature under all fields of view are controlled within ±0.02mm, the curvature of field is well suppressed, and the astigmatism is reasonably regulated, so that the optical system 10 of this embodiment can have clear imaging.
Third embodiment
Referring to fig. 5, in the third embodiment, the optical system 10 includes, in order from an object side to an image side along an optical axis 101, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, an aperture stop STO, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power. The surface shape of each lens in the optical system 10 is as follows:
The object side surface S1 of the first lens element L1 is convex at a paraxial region, and the image side surface S2 is concave at a paraxial region; the object side surface S1 is convex near the maximum effective aperture, and the image side surface S2 is concave near the maximum effective aperture.
The object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 is concave at a paraxial region; the object side surface S3 is convex near the maximum effective aperture, and the image side surface S4 is concave near the maximum effective aperture.
The third lens element L3 has a convex object-side surface S5 at a paraxial region and a convex image-side surface S6 at a paraxial region; the object side surface S5 is concave at the position near the maximum effective aperture, and the image side surface S6 is convex at the position near the maximum effective aperture.
The fourth lens element L4 has a convex object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the object side surface S7 is convex near the maximum effective aperture, and the image side surface S8 is concave near the maximum effective aperture.
The fifth lens element L5 has a convex object-side surface S9 at a paraxial region and a convex image-side surface S10 at a paraxial region; the object side surface S9 is convex at the near maximum effective aperture, and the image side surface S10 is convex at the near maximum effective aperture.
The object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 is concave at a paraxial region; the object side surface S11 is concave near the maximum effective aperture, and the image side surface S12 is convex near the maximum effective aperture.
The parameters of each lens of the optical system 10 in the third embodiment are given in tables 5 and 6, wherein the names and parameters of each element are defined in the first embodiment, and are not described herein.
TABLE 5
TABLE 6
The optical system 10 in this embodiment satisfies the following relationship:
FOV/TTL(deg/mm) 29.213 |R62/f6| 6.085
|f123/f456| 1.116 |R51/R61| 0.928
f4*FNO/f 7.194 R51(mm) 1.133
IMGH/BF 1.952 (CT45+CT56)/CT34 3.086
BF(mm) 1.336 V3+V5 76.301
as can be seen from the aberration diagrams in fig. 6, the longitudinal spherical aberration, field curvature, astigmatism and distortion of the optical system 10 are well controlled, wherein the meridional field curvature and sagittal field curvature under all fields of view are controlled within ±0.03mm, the curvature of field is well suppressed, and the astigmatism is reasonably regulated, so that the optical system 10 of this embodiment can have clear imaging.
Fourth embodiment
Referring to fig. 7, in the fourth embodiment, the optical system 10 includes, in order from the object side to the image side along the optical axis 101, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture stop STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power.
The surface shape of each lens in the optical system 10 is as follows:
the object side surface S1 of the first lens element L1 is convex at a paraxial region, and the image side surface S2 is concave at a paraxial region; the object side surface S1 is convex near the maximum effective aperture, and the image side surface S2 is concave near the maximum effective aperture.
The object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 is concave at a paraxial region; the object side surface S3 is convex near the maximum effective aperture, and the image side surface S4 is concave near the maximum effective aperture.
The third lens element L3 has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region; the object side surface S5 is convex near the maximum effective aperture, and the image side surface S6 is concave near the maximum effective aperture.
The fourth lens element L4 has a convex object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the object side surface S7 is convex at the position near the maximum effective aperture, and the image side surface S8 is convex at the position near the maximum effective aperture.
The fifth lens element L5 has a convex object-side surface S9 at a paraxial region and a convex image-side surface S10 at a paraxial region; the object side surface S9 is concave at the near maximum effective aperture, and the image side surface S10 is convex at the near maximum effective aperture.
The object side surface S11 of the sixth lens element L6 is concave at a paraxial region, and the image side surface S12 is convex at a paraxial region; the object side surface S11 is concave near the maximum effective aperture, and the image side surface S12 is convex near the maximum effective aperture.
The parameters of each lens of the optical system 10 in the fourth embodiment are given in tables 7 and 8, wherein the names and parameters of each element are defined in the first embodiment, and the description thereof is omitted herein.
TABLE 7
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TABLE 8
Face number 1 2 3 4 5 6
K 9.900E+01 -3.892E-01 3.727E-02 -1.804E+00 -5.512E+00 -1.123E+01
A4 4.169E-02 -2.071E-01 -1.256E+00 -2.011E-01 1.738E-01 5.913E-01
A6 -1.061E-02 1.793E-01 8.856E-01 2.952E+00 -5.315E+00 -9.471E-01
A8 4.359E-03 -1.471E+00 4.475E+00 -8.384E+01 1.012E+02 1.682E+02
A10 -1.963E-03 1.115E+01 -2.885E+00 1.558E+03 -1.416E+03 -5.928E+03
A12 3.312E-04 -3.997E+01 -5.804E+01 -1.457E+04 1.262E+04 1.034E+05
A14 3.299E-05 7.979E+01 2.003E+02 8.230E+04 -6.957E+04 -1.026E+06
A16 -1.835E-05 -8.764E+01 -3.081E+02 -2.836E+05 2.283E+05 5.903E+06
A18 2.244E-06 5.011E+01 2.377E+02 5.483E+05 -4.057E+05 -1.831E+07
A20 -9.273E-08 -1.267E+01 -7.445E+01 -4.557E+05 2.969E+05 2.369E+07
Face number 8 9 10 11 12 13
K 4.310E+00 -2.632E-01 2.066E+01 4.040E+01 -6.742E+00 -1.189E+00
A4 8.487E-02 -2.489E+00 -4.181E+00 -7.898E+00 -5.393E+00 1.049E+00
A6 4.139E+00 7.947E+01 8.436E+01 1.077E+01 3.016E+01 1.787E+01
A8 -4.886E+01 -1.373E+03 -1.314E+03 1.213E+03 7.099E+02 -2.164E+02
A10 -9.036E+02 1.628E+04 1.419E+04 -1.831E+04 -1.360E+04 1.175E+03
A12 2.980E+04 -1.335E+05 -1.057E+05 1.335E+05 1.079E+05 -3.825E+03
A14 -3.555E+05 7.360E+05 5.280E+05 -5.660E+05 -4.818E+05 7.795E+03
A16 2.195E+06 -2.592E+06 -1.684E+06 1.418E+06 1.261E+06 -9.644E+03
A18 -6.980E+06 5.244E+06 3.091E+06 -1.946E+06 -1.807E+06 6.519E+03
A20 9.036E+06 -4.627E+06 -2.477E+06 1.126E+06 1.097E+06 -1.799E+03
The optical system 10 in this embodiment satisfies the following relationship:
FOV/TTL(deg/mm) 39.289 |R62/f6| 0.34
|f123/f456| 0.843 |R51/R61| 3.569
f4*FNO/f 2.903 R51(mm) 3.304
IMGH/BF 2.104 (CT45+CT56)/CT34 1.025
BF(mm) 1.301 V3+V5 79.268
as can be seen from the aberration diagrams in fig. 8, the longitudinal spherical aberration, field curvature, astigmatism and distortion of the optical system 10 are well controlled, wherein the meridional field curvature and sagittal field curvature under most fields are controlled within ±0.05mm, the curvature of field is well suppressed, and the astigmatism is reasonably regulated, so that the optical system 10 of this embodiment can have clear imaging.
Fifth embodiment
Referring to fig. 9, in the fifth embodiment, the optical system 10 includes, in order from the object side to the image side along the optical axis 101, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture stop STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. The surface shape of each lens in the optical system 10 is as follows:
the object side surface S1 of the first lens element L1 is convex at a paraxial region, and the image side surface S2 is concave at a paraxial region; the object side surface S1 is convex near the maximum effective aperture, and the image side surface S2 is concave near the maximum effective aperture.
The object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 is concave at a paraxial region; the object side surface S3 is concave at the position near the maximum effective aperture, and the image side surface S4 is concave at the position near the maximum effective aperture.
The third lens element L3 has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region; the object side surface S5 is convex near the maximum effective aperture, and the image side surface S6 is concave near the maximum effective aperture.
The fourth lens element L4 has a convex object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the object side surface S7 is convex at the position near the maximum effective aperture, and the image side surface S8 is convex at the position near the maximum effective aperture.
The fifth lens element L5 has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region; the object side surface S9 is concave at the position near the maximum effective aperture, and the image side surface S10 is concave at the position near the maximum effective aperture.
The object side surface S11 of the sixth lens element L6 is convex at a paraxial region, and the image side surface S12 is convex at a paraxial region; the object side surface S11 is convex at the near maximum effective aperture, and the image side surface S12 is convex at the near maximum effective aperture.
The lens parameters of the optical system 10 in the fifth embodiment are given in tables 9 and 10, wherein the definition of the names and parameters of the elements can be obtained in the first embodiment, and the details are not repeated here.
TABLE 9
Table 10
The optical system 10 in this embodiment satisfies the following relationship:
FOV/TTL(deg/mm) 28.748 |R62/f6| 2.572
|f123/f456| 1.457 |R51/R61| 47.479
f4*FNO/f 6.468 R51(mm) 40
IMGH/BF 3.858 (CT45+CT56)/CT34 0.49
BF(mm) 0.933 V3+V5 47.419
as is clear from the aberration diagrams in fig. 10, the longitudinal spherical aberration, field curvature, astigmatism and distortion of the optical system 10 are well controlled, wherein the meridional field curvature and sagittal field curvature under all fields of view are controlled within ±0.01mm, the degree of curvature of the image plane is well suppressed, and the astigmatism is reasonably adjusted, so that the optical system 10 of this embodiment can have clear imaging.
Sixth embodiment
Referring to fig. 11, in the sixth embodiment, the optical system 10 includes, in order from the object side to the image side along the optical axis 101, a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture stop STO, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with positive refractive power. The surface shape of each lens in the optical system 10 is as follows:
the object side surface S1 of the first lens element L1 is convex at a paraxial region, and the image side surface S2 is concave at a paraxial region; the object side surface S1 is convex near the maximum effective aperture, and the image side surface S2 is concave near the maximum effective aperture.
The object side surface S3 of the second lens element L2 is convex at a paraxial region, and the image side surface S4 is concave at a paraxial region; the object side surface S3 is convex near the maximum effective aperture, and the image side surface S4 is concave near the maximum effective aperture.
The third lens element L3 has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region; the object side surface S5 is concave at the position near the maximum effective aperture, and the image side surface S6 is concave at the position near the maximum effective aperture.
The fourth lens element L4 has a convex object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the object side surface S7 is convex at the position near the maximum effective aperture, and the image side surface S8 is convex at the position near the maximum effective aperture.
The fifth lens element L5 has a convex object-side surface S9 at a paraxial region and a concave image-side surface S10 at a paraxial region; the object side surface S9 is concave at the near maximum effective aperture, and the image side surface S10 is convex at the near maximum effective aperture.
The object side surface S11 of the sixth lens element L6 is convex at a paraxial region, and the image side surface S12 is convex at a paraxial region; the object side surface S11 is concave near the maximum effective aperture, and the image side surface S12 is convex near the maximum effective aperture.
The lens parameters of the optical system 10 in the sixth embodiment are given in tables 11 and 12, wherein the definition of the names and parameters of the elements can be obtained in the first embodiment, and the details are not repeated here.
TABLE 11
Table 12
The optical system 10 in this embodiment satisfies the following relationship:
FOV/TTL(deg/mm) 38.083 |R62/f6| 1.023
|f123/f456| 0.692 |R51/R61| 7.051
f4*FNO/f 3.445 R51(mm) 8.413
IMGH/BF 2.19 (CT45+CT56)/CT34 1.173
BF(mm) 1.183 V3+V5 47.034
as can be seen from the aberration diagrams in fig. 12, the longitudinal spherical aberration, field curvature, astigmatism and distortion of the optical system 10 are well controlled, wherein the meridional field curvature and sagittal field curvature under all fields of view are controlled within ±0.05mm, the curvature of field is well suppressed, and the astigmatism is reasonably regulated, so that the optical system 10 of this embodiment can have clear imaging.
Referring to fig. 13, some embodiments of the present application further provide an image capturing module 20, where the image capturing module 20 includes the optical system 10 and the image sensor 210 in any of the above embodiments, and the image sensor 210 is disposed on the light emitting side of the optical system 10. The image sensor 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 take into consideration the small-sized structure and the wide-angle shooting performance.
Referring to fig. 14, some embodiments of the present application also provide an electronic device 30. 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 display screen cover, a circuit board, a middle frame, a rear cover, and the like. The electronic device 30 includes, but is not limited to, a smart phone, a smart watch, smart glasses, an electronic book reader, a vehicle-mounted camera device, a monitoring device, a drone, 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), a drone, etc. By adopting the camera module 20, the occupied space of the module in the electronic equipment 30 is reduced, the ultrathin design of the equipment is facilitated, and meanwhile, the equipment can obtain the wide-angle shooting capability, so that a wider range of object space scenes can be obtained.
In one embodiment, the electronic device 30 is an in-vehicle image capturing device, and the image capturing module 20 is disposed in a fixture 310 of the in-vehicle image capturing device. The electronic device 30 may cooperate with an auxiliary driving system, a driver monitoring system, and other vehicle-mounted auxiliary systems to transmit the obtained image information to the vehicle-mounted control system to determine the road condition or the driver state, so as to provide timely early warning for the driver. The image pickup device 30 may also cooperate with a display screen in the cab, for example, to display the obtained image on the display screen for viewing by the driver.
Referring to fig. 15, some embodiments of the present application also provide an automobile 40. The automobile 40 includes a mounting portion 410 and the electronic device 30, and the electronic device 30 is provided in the mounting portion 410. The mounting portion 410 may be a vehicle body portion suitable for mounting the image pickup apparatus, such as a front grille, an in-vehicle mirror, a left mirror, a right mirror, a roof, a trunk lid, or the like. The automobile 40 may be provided with a plurality of electronic devices 30 to obtain image information of the entire body. The driver or the vehicle-mounted system can acquire road condition information of a larger range around the automobile through the electronic equipment 30, so that the omnibearing image of the automobile body can be acquired even if the installation quantity of the equipment is reduced, and dead angles are reduced; meanwhile, clearer road condition images can be obtained through the electronic equipment 30, so that lower installation cost can be met, and driving safety can be improved due to better image definition.
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 (11)

1. An optical system, comprising, in order from an object side to an image side along an optical axis:
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a second lens element with refractive power having a convex object-side surface at a paraxial region;
a third lens element with positive refractive power;
a fourth lens element with positive refractive power having a convex object-side surface at a paraxial region;
a fifth lens element with refractive power having a convex object-side surface at a paraxial region;
a sixth lens element with refractive power having a convex image-side surface near the maximum effective aperture;
And the optical system satisfies the following relationship:
28.0deg/mm＜FOV/TTL＜40.0deg/mm；1.5＜IMGH/BF≤2.19；
the FOV is 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 the image height corresponding to the maximum angle of view of the optical system, and BF is the distance between the image side surface of the sixth lens and the imaging surface of the optical system on the optical axis.
2. The optical system of claim 1, wherein the optical system satisfies the relationship:
0.5＜|f123/f456|＜2；
f123 is the combined focal length of the first lens, the second lens and the third lens, and f456 is the combined focal length of the fourth lens, the fifth lens and the sixth lens.
3. The optical system of claim 1, wherein the optical system includes an aperture stop, the aperture stop is disposed between the second lens and the fifth lens, and the optical system satisfies the relationship:
2.5＜f4*FNO/f＜40.0；
f4 is the effective focal length of the fourth lens, FNO is the aperture value of the optical system, and f is the effective focal length of the optical system.
4. The optical system of claim 1, wherein the optical system satisfies the relationship:
BF＞0.85mm。
5. The optical system of claim 1, wherein the optical system satisfies the relationship:
0＜|R62/f6|＜7；
r62 is a radius of curvature of an image side surface of the sixth lens element at the optical axis, and f6 is an effective focal length of the sixth lens element.
6. The optical system of claim 1, wherein the optical system satisfies the relationship:
0＜|R51/R61|＜48；
R51＞1.1mm；
r51 is a radius of curvature of the object side surface of the fifth lens element at the optical axis, and R61 is a radius of curvature of the object side surface of the sixth lens element at the optical axis.
7. The optical system of claim 1, wherein the optical system satisfies the relationship:
0.4＜(CT45+CT56)/CT34＜3.5；
CT34 is the distance between the image side of the third lens element and the object side of the fourth lens element on the optical axis, CT45 is the distance between the image side of the fourth lens element and the object side of the fifth lens element on the optical axis, and CT56 is the distance between the image side of the fifth lens element and the object side of the sixth lens element on the optical axis.
8. The optical system of claim 1, wherein the optical system satisfies the relationship:
47.0＜V3+V5＜80.0；
v3 is the Abbe number of the third lens, and V5 is the Abbe number of the fifth lens.
9. An imaging module comprising an image sensor and the optical system of any one of claims 1 to 8, wherein the image sensor is disposed on an image side of the optical system.
10. An electronic device, comprising a fixing member and the camera module set according to claim 9, wherein the camera module set is disposed on the fixing member.
11. An automobile comprising a mounting portion and the electronic device according to claim 10, wherein the electronic device is provided in the mounting portion.
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