CN117192727A - Image pickup apparatus - Google Patents

Abstract

The application provides a lens group, wherein, the light incidence end to the light emergence end of the lens group sequentially comprise: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; an eighth lens; wherein, the first lens, the second lens, the third lens and the fourth lens form an upper group lens group, the fifth lens and the sixth lens form a middle group lens group, the seventh lens and the eighth lens form a lower group lens group, and the focal power of the upper group lens group is as follows: 0.094 < 1/fg1 < 0.12; the focal power of the middle group lens group is as follows: 0.14 < 1/fg2 < 0.16; the focal power of the lower group lens group is as follows: -0.266 < 1/fg3 < -0.25.

Description

Image pickup apparatus

Technical Field

The present application relates to the field of camera modules, and more particularly, to an optical anti-shake lens assembly with inner focusing function, an optical assembly and a camera module.

Background

With the rapid development of portable electronic devices such as smart phones and tablet computers, unlike the conventional single-shot or double-shot mobile phones, the high-end or flagship mobile phones are usually matched with a plurality of lenses, including large image surfaces, ultra-wide angles, long focuses and the like, and the imaging capability and the competitive advantage of the mobile phone lenses are greatly improved due to the matching of the lenses with higher specifications. The resolution ratio of the large-image-plane lens is higher, the ultra-thin lens can be better compatible with a smart phone, portability is met, and the traditional camera lens is difficult to meet the requirements.

The optical lens is one of the necessary components of the camera module, and can collect incident light rays to enable the camera module to image. In recent years, as the requirements of users on the imaging quality of the imaging module are higher and higher, the pixels of the imaging module are also continuously improved, and meanwhile, in order to improve the imaging quality of the imaging module, the size of the photosensitive chip is correspondingly increased, so that the design requirements on the optical lens adapted to the photosensitive chip are also higher and higher. The existing integrated optical lens configured in the camera module comprises a lens barrel and a plurality of lenses arranged on the lens barrel, meanwhile, due to the technical limitations of the design and the assembly method of the integrated optical lens, the numerical difference between TTL (TTL: the distance from the surface of the first lens 11 close to the light incidence end to the imaging surface of the camera lens on the optical axis) of the existing optical lens at the near-focus position and the infinity position is larger, which is unfavorable for reducing the total length of the optical lens.

How to reduce the numerical difference between the near-focus position and the infinity TTL of an optical lens is still a technical problem which needs to be solved rapidly at present.

Disclosure of Invention

In view of the foregoing, the present invention provides a lens assembly, which sequentially includes: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; an eighth lens; wherein, the first lens, the second lens, the third lens and the fourth lens form an upper group lens group, the fifth lens and the sixth lens form a middle group lens group, the seventh lens and the eighth lens form a lower group lens group, and the focal power of the upper group lens group is as follows: 0.094 < 1/fg1 < 0.12; the focal power of the middle group lens group is as follows: 0.14 < 1/fg2 < 0.16; the focal power of the lower group lens group is as follows: -0.266 < 1/fg3 < -0.25; in one embodiment, the focal length of the group of lenses comprising the fifth lens and the sixth lens satisfies fg2:6.06 < fg2 < 7.21.

In one embodiment, the TTL of the lens group and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the lens group satisfy: 1.12 < TTL/ImgH < 1.36.

In one embodiment, the focal length f1 of the first lens 11 and the total effective focal length f of the lens group satisfy: 10.51< f/f1<0.86.

In one embodiment, the radius of curvature r7 of the object-side surface of the fourth lens element and the radius of curvature r8 of the image-side surface of the fourth lens element satisfy: -0.38< r7/r8<4.134.

In one embodiment, the first lens focal length f1 and the total effective focal length f of the lens group satisfy: 10.51< f/f1<0.86.

In one embodiment, the eighth lens element focal length f8 and the eighth lens element image-side radius of curvature r16 are as follows: -1.63 < f8/r16 < -0.96.

In one embodiment, the focal length f2 of the second lens element 12 and the focal length f6 of the sixth lens element satisfy: -10.4 < f2/f6 < 18.4.

In one embodiment, the optical back focus bfl of the lens group and half of the diagonal length imgh of the effective pixel area on the imaging surface of the lens group satisfy: 0.078 < bfl/imgh < 0.083.

An optical assembly, comprising:

A drive assembly; and the lens group, wherein, part of the lens group is set up in the inside of the drive assembly.

A camera module, comprising:

a photosensitive assembly; and

the optical assembly is mounted above the photosensitive assembly and is maintained in the optical path of the photosensitive assembly.

Further objects and advantages of the present application will become fully apparent from the following description and the accompanying drawings.

These and other objects, features and advantages of the present application will become more fully apparent from the following detailed description, the accompanying drawings and the appended claims.

Drawings

The above and other objects, features and advantages of the present application will become more apparent by describing embodiments of the present application in more detail with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the embodiments of the application, and not constitute a limitation to the application. In the drawings, like reference numerals generally refer to like parts or steps.

Fig. 1 is a schematic structural diagram of an optical imaging lens according to a first embodiment of the present application.

Fig. 2 shows an on-axis chromatic aberration diagram of the optical imaging lens of the first embodiment.

Fig. 3 shows a distortion curve of the optical imaging lens of the first embodiment.

Fig. 4 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present application.

Fig. 5 shows an on-axis chromatic aberration diagram of the optical imaging lens of the second embodiment.

Fig. 6 shows a distortion curve of the optical imaging lens of the second embodiment.

Fig. 7 is a schematic structural diagram of an optical imaging lens according to a third embodiment of the present application.

Fig. 8 shows an on-axis chromatic aberration diagram of the optical imaging lens of the third embodiment.

Fig. 9 shows a distortion curve of the optical imaging lens of the third embodiment.

Fig. 10 is a schematic structural diagram of an optical imaging lens according to a fourth embodiment of the present application.

Fig. 11 shows an on-axis chromatic aberration diagram of the optical imaging lens of the fourth embodiment.

Fig. 12 shows a distortion curve of the optical imaging lens of the fourth embodiment.

Fig. 13 shows a schematic diagram of the structure of the module according to the application.

Detailed Description

Hereinafter, exemplary embodiments according to the present application will be described in detail with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present application and not all embodiments of the present application, and it should be understood that the present application is not limited by the example embodiments described herein.

In the description of the present application, it should be noted that, for the azimuth words such as terms "center", "lateral", "longitudinal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., the azimuth and positional relationships are based on the azimuth or positional relationships shown in the drawings, it is merely for convenience of describing the present application and simplifying the description, and it is not to be construed as limiting the specific scope of protection of the present application that the device or element referred to must have a specific azimuth configuration and operation.

It should be noted that the terms "first," "second," and the like in the description and in the claims are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

The terms "comprises" and "comprising," along with any variations thereof, in the description and claims, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The application provides a lens group 10, wherein the lens group 10 is formed by combining a plurality of lenses. The lens group 10 may include eight lenses having optical power, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17, and an eighth lens 18. The eight lenses are arranged in order from the object side to the image side along the optical axis. Any two adjacent lenses of the first lens 11 to the eighth lens 18 may have a separation distance therebetween.

The lens group 10 according to the above embodiment of the present application may employ a plurality of lenses, for example, eight lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like, the volume of the lens group 10 can be effectively reduced, and the processability of the lens group 10 can be improved, so that the lens group 10 is more beneficial to production and processing and can be suitable for portable electronic products. The lens group 10 configured as described above can have characteristics such as a large aperture, a large image plane, ultra-thin, good imaging quality, and the like.

In the embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror, that is, at least one of the object side surface of the first lens 11 to the image side surface of the eighth lens 18 is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of an object side surface and an image side surface of each of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, and the eighth lens 18 is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each of the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, the fifth lens 15, the sixth lens 16, the seventh lens 17, and the eighth lens 18 are aspherical mirror surfaces. However, it will be appreciated by those skilled in the art that the number of lenses making up the lens group 10 can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although eight lenses are described as an example in the embodiment, the lens group 10 is not limited to include eight lenses. The lens group 10 may also include other numbers of lenses, if desired.

In the exemplary embodiment, the first lens 11, the second lens 12, the third lens 13, and the fourth lens 14 constitute an upper group lens group 101, the fifth lens 15 and the sixth lens 16 constitute a middle group lens group 102, and the seventh lens 17 and the eighth lens 18 constitute a lower group lens group 103.

In an exemplary embodiment, the first lens 11 may have positive optical power; the second lens 12 may have positive or negative optical power; the third lens 13 may have positive optical power; the fourth lens 14 may have negative optical power; the fifth lens 15 may have positive or negative optical power; the sixth lens 16 may have positive optical power; the seventh lens 17 may have negative optical power; the eighth lens 18 may have negative optical power.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: the TTL value of the lens group 10 at the near focus and at infinity is unchanged, wherein TTL is the distance between the surface of the first lens 11 near the light incident end and the imaging surface of the imaging lens on the optical axis. The lens group 10 has unchanged TTL values at the near focus position and the infinity position, is beneficial to reducing the total length of the lens as far as possible while guaranteeing the imaging quality of the lens, and is beneficial to realizing the ultrathin characteristic of the imaging lens.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 8.00 mm.ltoreq.ImgH, where ImgH is half the diagonal length of the effective pixel area on the imaging surface of the lens group 10. Meets the requirement of ImgH with the thickness of 8.00mm or less, and is favorable for realizing the characteristic of large image surface.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 0.094 < 1/fg1 < 0.12. Wherein 1/fg1 is the focal power of the upper group lens group, satisfying: 0.094 < 1/fg1 < 0.12. The aberration of the system can be corrected so as to meet the image quality requirements at different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 0.14 < 1/fg2 < 0.16. Wherein, 1/fg2 is the focal power of the group lens group, which satisfies the following conditions: 0.14 < 1/fg2 < 0.16. The aberration of the system can be corrected so as to meet the image quality requirements at different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: -0.266 < 1/fg3 < -0.25. Wherein 1/fg3 is the focal power of the lower group lens group, which satisfies the following conditions: -0.266 < 1/fg3 < -0.25. The aberration of the system can be corrected so as to meet the image quality requirements at different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 1.12 < TTL/ImgH < 1.36, wherein TTL is the distance between the surface of the first lens 11 near the light incident end and the imaging surface of the imaging lens on the optical axis, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the lens group 10. The lens group 10 can have better imaging quality and reduce design difficulty on the premise of ensuring the total length of the thinner lens group 10 by satisfying the condition that TTL/ImgH is smaller than 1.12 and smaller than 1.36. Meanwhile, the total length of the lens can be reduced as much as possible while the imaging quality of the lens is ensured, and the ultrathin characteristic of the imaging lens is realized.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 6.06 < fg2 < 7.21, wherein fg2 is the focal length of the middle group lens group 102 composed of the fifth lens 15 and the sixth lens 16, and the condition that fg2 < 7.21 is 6.06 can be met by moving the middle group, so that the object-image characteristic of the optical system can be changed, and the near performance of the optical system can be improved.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: -0.38< r7/r8<4.134, wherein r7 and r8 are respectively the front and back curvature radius of the fourth lens 14, which satisfies-0/38 < r7/r8<4.134, so that the aggregation degree of light in the fourth lens 14 can be optimized, the sensitivity of the fourth lens 14 can be reduced, and the yield of the fourth lens 14 can be improved.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 10.51< f/f1<0.86, where f1 is the focal length of the first lens 11 and f is the total effective focal length of the lens group 10. Satisfies 10.51< f/f1<0.86, is favorable for large-field light to be incident to the first lens 11, is favorable for the first lens 11 to correct off-axis aberration generated by other lenses, and is favorable for improving the imaging quality of the lens.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: -1.63 < f8/r16 < -0.96, wherein f8 is the focal length of the eighth lens element 18, r16 is the curvature radius of the image side surface of the eighth lens element 18, and-1.63 < f8/r16 < -0.96 is satisfied, so that the geometric shape of the fourth lens element 14 can be effectively improved, the emergent angle of light rays from the fourth lens element 14 can be controlled, and the ghost image effect can be reduced.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: -10.4 < f2/f6 < 18.4, wherein f2 is the focal length of the second lens 12, f6 is the image focal length of the sixth lens 16, and-10.4 < f2/f6 < 18.4 is satisfied, so that the degree of freedom of surface variation of the second lens 12 and the third lens 13 can be improved, and the astigmatism and field curvature correcting capability of the imaging lens can be improved.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: the optical back focus of the lens group 10 can be controlled to reduce the volume of the lens group 10 and achieve the effect of miniaturization, wherein 0.078 < bfl/imgh < 0.083, bfl is the optical back focus of the lens group 10, imgh is half of the diagonal length of the effective pixel area on the imaging surface of the lens group 10, and 0.078 < bfl/imgh < 0.083 is satisfied.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 1.15 < fg1/f < 1.38, wherein fg1 is the focal length of the upper lens group 101 composed of the first lens element 11, the second lens element 12, the third lens element 13 and the fourth lens element 14, and f is the total effective focal length of the lens assembly 10, which satisfies 1.15 < fg1/f < 1.38, and system aberration can be reasonably corrected, so that the lens assembly 10 can satisfy required image quality at different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 0.79 < fg2/f < 0.98, wherein fg2 is the focal length of the middle group lens assembly 102 composed of the fifth lens element 15 and the sixth lens element 16, and f is the total effective focal length of the lens assembly 10, which satisfies 0.79 < fg2/f < 0.98, and can reasonably correct system aberration, so that the lens assembly 10 can satisfy required image quality at different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: -0.55 < fg3/f < -0.47, wherein fg3 is the focal length of the lower lens group 103 composed of the seventh lens element 17 and the eighth lens element 18, and f is the total effective focal length of the lens assembly 10, satisfying-0.55 < fg3/f < -0.47, and reasonably correcting system aberration, so that the lens assembly 10 can satisfy required image quality at different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 0.81 < ctg1/ctg2 < 1.73, wherein ctg1 is the interval between the upper group lens group 101 and the middle group lens group 102, ctg2 is the interval between the middle group lens group 102 and the lower group lens group 103, and the interval satisfies 0.81 < ctg1/ctg2 < 1.73, so that the lens group 10 can realize system miniaturization under the condition of different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 0.85 < ctg2/ctg3 < 1.79, wherein ctg2 is the interval between the middle group lens group 102 and the lower group lens group 103, ctg3 is the optical back focus, that is, the interval between the lower group lens group 103 and the chip, and the ctg2/ctg3 < 1.79 is satisfied, so that the lens group 10 can realize system miniaturization under the condition of different object distances.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 3.6 < Σct/Σct56 < 6.23, wherein Σct is the sum of the center thicknesses of all lenses, Σct56 is the sum of the center thicknesses of the two lenses (namely the fifth lens 15 and the sixth lens 16) of the middle group lens group 102, thereby satisfying 3.6 < Σct/Σct56 < 6.23, improving the auto-focusing capability of the lens, effectively correcting the curvature of field of the lens, improving the off-axis aberration of the lens, and improving the imaging quality of the lens.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: the ratio of ImgH/f is more than 0.99 and less than 1.14, wherein ImgH is half of the diagonal length of an effective pixel area on the imaging surface of the lens group 10, f is the total effective focal length of the lens group 10, and the ratio of ImgH/f is more than 0.99 and less than 1.14, so that the imaging lens is beneficial to more effectively controlling the length of the lens under the imaging condition of larger angle of view by reasonably selecting the ratio of ImgH and f, and is beneficial to realizing miniaturization of the imaging lens.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 5.21 < R5/f < 32.25, where f is the total effective focal length of the lens assembly 10 and R5 is the radius of curvature of the object-side surface of the third lens element 13. Satisfying R5/f < 32.25, which is more than 5.21, can improve curvature of field and distortion of the lens assembly 10, and reduce the difficulty of processing the third lens 13.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: 0.44 < CT1/T12 < 0.71, wherein T12 is the distance between the first lens 11 and the second lens 12 on the optical axis, and CT1 is the center thickness of the first lens 11 on the optical axis. The lens satisfies CT1/T12 of 0.44 < 0.71, is favorable for reducing the deformation caused by lens assembly, reduces the assembly difficulty, and further obtains better imaging quality.

In an exemplary embodiment, the lens group 10 according to the present application may satisfy: -245.3 < (r2+r3)/(r2—r3) < 45.3, where R2 is the radius of curvature of the image side of the first lens 11 and R3 is the radius of curvature of the object side of the second lens 12. Satisfies that (R2+R3)/(R2-R3) is less than 45.3, can reasonably control the object side deflection angle of the first lens 11 at the edge view field to be in a reasonable range, and can effectively reduce the sensitivity of the lens group 10.

In an exemplary embodiment, the lens assembly 10 according to the present application may be provided with at least one diaphragm, and the position of the diaphragm may be disposed before the first lens 11, after each lens or after the last lens, and the diaphragm may be configured as a front diaphragm or a middle diaphragm. The front aperture means that the aperture is disposed between the subject and the first lens 11, and the middle aperture means that the aperture is disposed between the first lens 11 and the imaging surface. If the aperture is a front aperture, a longer distance can be generated between the exit pupil of the imaging optical system and the imaging surface, so that the imaging optical system has telecentric effect, and the efficiency of receiving images by the CCD or the CMOS of the electronic photosensitive element can be increased; if the diaphragm is arranged in the middle, the system is beneficial to enlarging the field angle of the system, so that the imaging optical system has the advantage of a wide-angle lens. The arrangement of the diaphragm can be used for reducing stray light and is beneficial to improving the image quality.

In an exemplary embodiment, the lens may be made of plastic or glass. When the lens element is made of glass, the flexibility of the refractive power arrangement can be increased. In addition, when the lens is made of plastic, the production cost can be effectively reduced. In addition, an Aspherical Surface (ASP) can be disposed on the surface of the lens, and the aspherical surface can be easily manufactured into a shape other than a spherical surface, so as to obtain more control variables for reducing aberration, thereby reducing the number of lenses required, and further effectively reducing the total optical length.

In an exemplary embodiment, if the lens surface is convex and the convex location is not defined, it means that the lens surface may be convex at a paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface may be concave at a paraxial region. If the refractive power or focal length of the lens element does not define its region position, it means that the refractive power or focal length of the lens element may be the refractive power or focal length of the lens element at a paraxial region.

In an exemplary embodiment, the imaging surface of the imaging optical system may be a plane or a curved surface with any curvature, particularly a curved surface with a concave surface facing the object side, according to the electronic photosensitive element corresponding to the imaging surface.

Example 1

A lens group 10 according to embodiment 1 of the present application is described below with reference to fig. 1 to 3. Fig. 1 shows a schematic configuration diagram of a lens group 10 according to embodiment 1 of the present application. Table one shows a basic parameter table of the optical imaging lens of the first embodiment.

As shown in fig. 1, the lens assembly 10 sequentially includes, from an object side to an image side: stop STO, first lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, sixth lens 16, seventh lens 17, eighth lens 18, filter 19, and imaging plane.

The first lens 11 has positive power, and the object-side surface 111 is convex, and the image-side surface 112 is concave, so that the space of the imaging optical system can be further effectively utilized to shorten the back focal length of the imaging optical system. The second lens element 12 has a positive refractive power, and the object-side surface 121 thereof is convex and the image-side surface 122 thereof is concave, so as to facilitate the disposition of the lens element with high refractive power at a position near the middle of the whole imaging optical system, and avoid the difficulty in processing caused by excessive bending of the shape of the lens element with high refractive power. The third lens element 13 has positive refractive power, wherein an object-side surface 131 thereof is concave, and an image-side surface 132 thereof is convex. The fourth lens element 14 has a negative refractive power, wherein an object-side surface 141 thereof is concave and an image-side surface 142 thereof is convex. The fifth lens element 15 has a positive refractive power, wherein an object-side surface 151 thereof is concave, and an image-side surface 152 thereof is convex. The sixth lens element 16 has positive refractive power, and the object-side surface 161 thereof is concave, and the image-side surface 162 thereof is convex, so that the refractive power distribution of the imaging optical system can be appropriately arranged, thereby contributing to correction of aberrations and expansion of the angle of view. The seventh lens 17 has negative power, and the object side 1717 is concave, and the image side 172 is concave, so that the principal point of the imaging optical system is far away from the image side end of the imaging optical system, and the back focal length of the imaging optical system is shortened, thereby avoiding the overlarge volume of the imaging optical system. The eighth lens element 18 has a negative refractive power, and the object-side surface 181 and the image-side surface 182 thereof are concave, so as to shorten the total length and correct the aberration, and simultaneously suppress the angle of incidence of the light rays with off-axis field on the photosensitive element, thereby increasing the receiving efficiency of the image photosensitive element and further correcting the aberration with off-axis field. The filter 19 has an object side 191 and an image side 192. Light from the object passes sequentially through each of the surfaces 111 to 192 and is finally imaged on the imaging surface.

In an exemplary embodiment, the lens group 10 according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging plane.

In this example, the total effective focal length f of the lens group 10 is 8.3mm, the total length TTL of the lens group 10 (i.e., the distance on the optical axis from the object side surface 111 of the first lens 11 to the imaging surface of the lens group 10) is 10.1mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the lens group 10 is 8.165mm, the FOV of the maximum field angle of the lens group 10 is 87.6 °, and the aperture value Fno of the lens group 10 is 1.95.

In this example, the optical power of the upper group lens group of the lens group 10 is 1/fg1=0.1; the focal power of the middle group lens group is 1/fg 2=0.14; the focal power of the lower group lens group is 1/fg 3= -0.26.

The distance ttl=10.1 between the surface of the first lens 11 of the lens assembly 10 near the light incident end and the imaging surface of the imaging lens on the optical axis. Half of the diagonal length of the effective pixel area on the imaging surface of the lens group 10 imgh= 8.165. TTL/imgh=1.24. The focal length fg2=7.2 of the middle group lens group 102 composed of the fifth lens 15 and the sixth lens 16. The ratio r 7/r8= -0.37 of the front and rear radii of curvature r7, r8 of the fourth lens 14. The ratio f/f1=0.64 of the focal length of the first lens 11 to the total effective focal length of the lens assembly 10. The ratio f8/r16= -0.96 of the focal length of the eighth lens element 18 to the curvature radius of the image-side surface of the eighth lens element 18. The ratio f2/f6=6.63 of the focal length of the second lens element 12 to the focal length of the sixth lens element 16. The ratio bfl/imgh=0.083 of the optical back focal length of the lens group 10 to half the diagonal length of the effective pixel area on the imaging surface of the lens group 10. ImgH/f=0.99.

The first lens element 11, the second lens element 12, the third lens element 13 and the fourth lens element 14 form a ratio fg 1/f=1.15 of the focal length of the upper lens group 101 to the total effective focal length of the lens assembly 10. The fifth lens element 15 and the sixth lens element 16 are arranged to form a ratio fg 2/f=0.87 of the focal length of the middle lens group 102 to the total effective focal length of the lens assembly 10. The seventh lens 17 and the eighth lens 18 are formed by a ratio fg 3/f= -0.46 of a focal length fg3 of the lower lens group 103 to a total effective focal length fg 10 of the lens group.

Ratio ctg 1/ctg2=1.1 of spacing ctg1 between the upper group lens group 101 and the middle group lens group 102 to spacing ctg2 between the middle group lens group 102 and the lower group lens group 103. The ratio ctg 2/ctg3=1.21 between the interval ctg2 between the middle group lens group 102 and the lower group lens group 103 and the optical back focus, that is, the interval ctg3 between the lower group lens group 103 and the chip. The ratio Σct/Σct56=3.6 of the sum Σct of the center thicknesses of all lenses to the sum Σct56 of the center thicknesses of the two lenses (i.e., the fifth lens 15 and the sixth lens 16) of the middle group lens 102.

The ratio R5/f=9.0 of the radius of curvature of the object side surface of the third lens element 13 to the total effective focal length of the lens assembly 10. The ratio CT 1/t12=0.54 of the distance separating the first lens 11 and the second lens 12 on the optical axis to the center thickness of the first lens 11 on the optical axis. (r2+r3)/(r2—r3) =7.13. Where R2 is the radius of curvature of the image side of the first lens element 11 and R3 is the radius of curvature of the object side of the second lens element 12.

Fig. 2 shows an on-axis chromatic aberration curve of the lens group 10 of embodiment 1, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 3 shows a distortion curve of the lens group 10 of embodiment 1, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 2 and 3, the lens group 10 according to embodiment 1 can achieve good imaging quality.

Example two

A lens group 10 according to embodiment 1 of the present application is described below with reference to fig. 4. Fig. 4 shows a schematic configuration diagram of a lens group 10 according to embodiment 1 of the present application. Table two shows a basic parameter table of the optical imaging lens of the second embodiment.

As shown in fig. 4, the lens assembly 10 sequentially includes, from an object side to an image side: stop STO, first lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, sixth lens 16, seventh lens 17, eighth lens 18, filter 19, and imaging plane.

The first lens 11 has positive power, and the object-side surface 111 is convex, and the image-side surface 112 is concave, so that the space of the imaging optical system can be further effectively utilized to shorten the back focal length of the imaging optical system. The second lens element 12 has a positive refractive power, and the object-side surface 121 thereof is convex and the image-side surface 122 thereof is concave, so as to facilitate the disposition of the lens element with high refractive power at a position near the middle of the whole imaging optical system, and avoid the difficulty in processing caused by excessive bending of the shape of the lens element with high refractive power. The third lens element 13 has positive refractive power, wherein an object-side surface 131 thereof is concave, and an image-side surface 132 thereof is convex. The fourth lens element 14 has a negative refractive power, wherein an object-side surface 141 thereof is concave and an image-side surface 142 thereof is convex. The fifth lens element 15 has a negative refractive power, wherein an object-side surface 151 thereof is concave and an image-side surface 152 thereof is convex. The sixth lens element 16 has positive refractive power, and the object-side surface 161 thereof is concave, and the image-side surface 162 thereof is convex, so that the refractive power distribution of the imaging optical system can be appropriately arranged, thereby contributing to correction of aberrations and expansion of the angle of view. The seventh lens 17 has negative power, the object-side surface 171 is concave, and the image-side surface 172 is concave, so that the principal point of the imaging optical system can be far away from the image-side end of the imaging optical system, and the back focal length of the imaging optical system can be shortened, thereby avoiding the overlarge volume of the imaging optical system. The eighth lens element 18 has a negative refractive power, and the object-side surface 181 and the image-side surface 182 thereof are concave, so as to shorten the total length and correct the aberration, and simultaneously suppress the angle of incidence of the light rays with off-axis field on the photosensitive element, thereby increasing the receiving efficiency of the image photosensitive element and further correcting the aberration with off-axis field. The filter 19 has an object side 191 and an image side 192. Light from the object passes sequentially through each of the surfaces 111 to 192 and is finally imaged on the imaging surface.

In an exemplary embodiment, the lens group 10 according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging plane.

In this example, the total effective focal length f of the lens group 10 is 7.2mm, the total length TTL of the lens group 10 (i.e., the distance on the optical axis from the object side surface 111 of the first lens 11 to the imaging surface of the lens group 10) is 9.18mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface of the lens group 10 is 8.165mm, the FOV of the maximum field angle of the lens group 10 is 95.5 °, and the aperture value Fno of the lens group 10 is 1.95.

In this example, the optical power of the upper group lens group of the lens group 10 is 1/fg1=0.12; the focal power of the middle group lens group is 1/fg 2=0.14; the focal power of the lower group lens group is 1/fg 3= -0.26.

The distance ttl=9.18 between the surface of the first lens 11 of the lens assembly 10 near the light incident end and the imaging surface of the imaging lens on the optical axis. Half of the diagonal length of the effective pixel area on the imaging surface of the lens group 10 imgh= 8.165. TTL/imgh=1.12. The focal length fg2=7.04 of the middle group lens group 102 composed of the fifth lens 15 and the sixth lens 16. The ratio r 7/r8=0.23 of the front and rear radii of curvature r7, r8 of the fourth lens 14. The ratio f/f1=0.54 of the focal length of the first lens 11 to the total effective focal length of the lens assembly 10. The ratio f8/r16= -1.18 of the focal length of the eighth lens element 18 to the curvature radius of the image-side surface of the eighth lens element 18. The ratio f2/f6=7.11 of the focal length of the second lens element 12 to the focal length of the sixth lens element 16. The ratio bfl/imgh=0.083 of the optical back focal length of the lens group 10 to half the diagonal length of the effective pixel area on the imaging surface of the lens group 10. ImgH/f=1.14.

The first lens element 11, the second lens element 12, the third lens element 13 and the fourth lens element 14 form a ratio fg 1/f=1.18 of the focal length of the upper lens group 101 to the total effective focal length of the lens assembly 10. The fifth lens element 15 and the sixth lens element 16 are arranged to form a ratio fg 2/f=0.98 of the focal length of the middle lens group 102 to the total effective focal length of the lens assembly 10. The seventh lens 17 and the eighth lens 18 are formed by a ratio fg 3/f= -0.55 of a focal length fg3 of the lower lens group 103 to a total effective focal length fg 10 of the lens group.

Ratio ctg 1/ctg2=0.81 of spacing ctg1 between the upper group lens group 101 and the middle group lens group 102 to spacing ctg2 between the middle group lens group 102 and the lower group lens group 103. The ratio ctg 2/ctg3=0.89 between the interval ctg2 between the middle group lens group 102 and the lower group lens group 103 and the optical back focus, that is, the interval ctg3 between the lower group lens group 103 and the chip. The ratio Σct/Σct56=4.11 of the sum Σct of the center thicknesses of all lenses to the sum Σct56 of the center thicknesses of the two lenses (i.e., the fifth lens 15 and the sixth lens 16) of the middle group lens 102.

The ratio R5/f=32.24 of the radius of curvature of the object side surface of the third lens element 13 to the total effective focal length of the lens assembly 10. The ratio CT 1/t12=0.71 of the distance separating the first lens 11 and the second lens 12 on the optical axis to the center thickness of the first lens 11 on the optical axis. (r2+r3)/(r2—r3) =45.33. Where R2 is the radius of curvature of the image side of the first lens element 11 and R3 is the radius of curvature of the object side of the second lens element 12.

Fig. 5 shows an on-axis chromatic aberration curve of the lens group 10 of embodiment 2, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 6 shows a distortion curve of the lens group 10 of embodiment 2, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 5 and 6, the lens group 10 according to embodiment 2 can achieve good imaging quality.

Example III

A lens group 10 according to embodiment 1 of the present application is described below with reference to fig. 7. Fig. 7 shows a schematic configuration diagram of a lens group 10 according to embodiment 1 of the present application. Table three shows a basic parameter table of the optical imaging lens of the third embodiment.

As shown in fig. 7, the lens assembly 10 sequentially includes, from an object side to an image side: stop STO, first lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, sixth lens 16, seventh lens 17, eighth lens 18, filter 19, and imaging plane.

The first lens 11 has positive power, and the object-side surface 111 is convex, and the image-side surface 112 is concave, so that the space of the imaging optical system can be further effectively utilized to shorten the back focal length of the imaging optical system. The second lens element 12 has a positive refractive power, and the object-side surface 121 thereof is convex and the image-side surface 122 thereof is concave, so as to facilitate the disposition of the lens element with high refractive power at a position near the middle of the whole imaging optical system, and avoid the difficulty in processing caused by excessive bending of the shape of the lens element with high refractive power. The third lens element 13 has positive refractive power, wherein an object-side surface 131 thereof is concave, and an image-side surface 132 thereof is convex. The fourth lens element 14 has a negative refractive power, wherein an object-side surface 141 thereof is concave and an image-side surface 142 thereof is convex. The fifth lens element 15 has a negative refractive power, wherein an object-side surface 151 thereof is concave and an image-side surface 152 thereof is convex. The sixth lens element 16 has positive refractive power, and the object-side surface 161 and the image-side surface 162 are convex, so that refractive power distribution of the imaging optical system can be appropriately arranged, which contributes to correction of aberrations and expansion of the angle of view. The seventh lens 17 has negative power, the object-side surface 171 is concave, and the image-side surface 172 is concave, so that the principal point of the imaging optical system can be far away from the image-side end of the imaging optical system, and the back focal length of the imaging optical system can be shortened, thereby avoiding the overlarge volume of the imaging optical system. The eighth lens element 18 has a negative refractive power, and the object-side surface 181 and the image-side surface 182 thereof are concave, so as to shorten the total length and correct the aberration, and simultaneously suppress the angle of incidence of the light rays with off-axis field on the photosensitive element, thereby increasing the receiving efficiency of the image photosensitive element and further correcting the aberration with off-axis field. The filter 19 has an object side 191 and an image side 192. Light from the object passes sequentially through each of the surfaces 111 to 192 and is finally imaged on the imaging surface.

In an exemplary embodiment, the lens group 10 according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging plane.

In this example, the total effective focal length f of the lens group 10 is 7.7mm, the total length TTL of the lens group 10 (i.e., the distance on the optical axis from the object side surface S1 of the first lens 11E1 to the imaging surface of the lens group 10) is 11.1mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the lens group 10 is 8.165mm, the FOV of the maximum field angle of the lens group 10 is 91.4 °, and the aperture value Fno of the lens group 10 is 1.73.

In this example, the optical power of the upper group lens group of the lens group 10 is 1/fg1=0.09; the focal power of the middle group lens group is 1/fg 2=0.16; the focal power of the lower group lens group is 1/fg 3= -0.25.

The distance ttl=11.1 between the surface of the first lens 11 of the lens assembly 10 near the light incident end and the imaging surface of the imaging lens on the optical axis. Half of the diagonal length of the effective pixel area on the imaging surface of the lens group 10 imgh= 8.165. TTL/imgh=1.36. The focal length fg2=6.06 of the middle group lens group 102 composed of the fifth lens 15 and the sixth lens 16. The ratio r 7/r8= -0.38 of the front and rear radii of curvature r7, r8 of the fourth lens 14. The ratio f/f1=0.51 of the focal length of the first lens 11 to the total effective focal length of the lens assembly 10. The ratio f8/r16= -1.46 of the focal length of the eighth lens element 18 to the curvature radius of the image-side surface of the eighth lens element 18. The ratio f2/f6=18.4 of the focal length of the second lens element 12 to the focal length of the sixth lens element 16. The ratio bfl/imgh=0.078 of the optical back focal length of the lens group 10 to half the diagonal length of the effective pixel area on the imaging surface of the lens group 10. ImgH/f=1.06.

The first lens element 11, the second lens element 12, the third lens element 13 and the fourth lens element 14 form a ratio fg 1/f=1.38 of the focal length of the upper lens group 101 to the total effective focal length of the lens assembly 10. The fifth lens element 15 and the sixth lens element 16 are arranged to have a ratio fg 2/f=0.79 of the focal length of the middle lens group 102 to the total effective focal length of the lens assembly 10. The seventh lens 17 and the eighth lens 18 are formed by a ratio fg 3/f= -0.52 of a focal length fg3 of the lower lens group 103 to a total effective focal length fg3 of the lens group 10.

Ratio ctg 1/ctg2=1.73 of spacing ctg1 between the upper group lens group 101 and the middle group lens group 102 to spacing ctg2 between the middle group lens group 102 and the lower group lens group 103. The ratio ctg 2/ctg3=1.79 between the interval ctg2 between the middle group lens group 102 and the lower group lens group 103 and the optical back focus, that is, the interval ctg3 between the lower group lens group 103 and the chip. The ratio Σct/Σct56=6.23 of the sum Σct of the center thicknesses of all lenses to the sum Σct56 of the center thicknesses of the two lenses (i.e., the fifth lens 15 and the sixth lens 16) of the middle group lens 102.

The ratio R5/f=6.81 of the radius of curvature of the object side surface of the third lens element 13 to the total effective focal length of the lens assembly 10. The ratio CT 1/t12=0.7 of the separation distance of the first lens 11 and the second lens 12 on the optical axis to the center thickness of the first lens 11 on the optical axis. (r2+r3)/(r2—r3) =7.32. Where R2 is the radius of curvature of the image side of the first lens element 11 and R3 is the radius of curvature of the object side of the second lens element 12.

Fig. 8 shows an on-axis chromatic aberration curve of the lens group 10 of embodiment 3, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 9 shows a distortion curve of the lens group 10 of embodiment 3, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 8 and 9, the lens group 10 according to embodiment 3 can achieve good imaging quality.

Example IV

A lens group 10 according to embodiment 1 of the present application is described below with reference to fig. 10. Fig. 10 shows a schematic structural diagram of a lens group 10 according to embodiment 1 of the present application. Table four shows a basic parameter table of the optical imaging lens of the fourth embodiment.

As shown in fig. 10, the lens assembly 10 sequentially includes, from an object side to an image side: stop STO, first lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, sixth lens 16, seventh lens 17, eighth lens 18, filter 19, and imaging plane.

The first lens 11 has positive power, and the object-side surface 111 is convex, and the image-side surface 112 is concave, so that the space of the imaging optical system can be further effectively utilized to shorten the back focal length of the imaging optical system. The second lens element 12 has a negative refractive power, wherein an object-side surface 121 thereof is convex, and an image-side surface 122 thereof is concave. The third lens element 13 has positive refractive power, wherein an object-side surface 131 thereof is concave, and an image-side surface 132 thereof is convex. The fourth lens element 14 has a negative refractive power, wherein an object-side surface 141 thereof is concave, and an image-side surface 142 thereof is concave. The fifth lens element 15 has a negative refractive power, wherein an object-side surface 151 thereof is concave and an image-side surface 152 thereof is convex. The sixth lens element 16 has positive refractive power, and the object-side surface 161 thereof is concave, and the image-side surface 162 thereof is convex, so that the refractive power distribution of the imaging optical system can be appropriately arranged, thereby contributing to correction of aberrations and expansion of the angle of view. The seventh lens 17 has negative power, the object-side surface 171 is concave, and the image-side surface 172 is concave, so that the principal point of the imaging optical system can be far away from the image-side end of the imaging optical system, and the back focal length of the imaging optical system can be shortened, thereby avoiding the overlarge volume of the imaging optical system. The eighth lens element 18 has a negative refractive power, and the object-side surface 181 and the image-side surface 182 thereof are concave, so as to shorten the total length and correct the aberration, and simultaneously suppress the angle of incidence of the light rays with off-axis field on the photosensitive element, thereby increasing the receiving efficiency of the image photosensitive element and further correcting the aberration with off-axis field. The filter 19 has an object side 191 and an image side 192. Light from the object passes sequentially through each of the surfaces 111 to 192 and is finally imaged on the imaging surface.

In an exemplary embodiment, the lens group 10 according to the present application may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on an imaging plane.

In this example, the total effective focal length f of the lens group 10 is 7.9mm, the total length TTL of the lens group 10 (i.e., the distance on the optical axis from the object side surface S1 of the first lens 11E1 to the imaging surface of the lens group 10) is 9.4mm, half of the diagonal length ImgH of the effective pixel area on the imaging surface S19 of the lens group 10 is 8.165mm, the FOV of the maximum field angle of the lens group 10 is 90.1 °, and the aperture value Fno of the lens group 10 is 2.4.

In this example, the optical power of the upper group lens group of the lens group 10 is 1/fg1=0.11; the focal power of the middle group lens group is 1/fg 2=0.14; the focal power of the lower group lens group is 1/fg 3= -0.27.

The distance ttl=9.4 between the surface of the first lens 11 of the lens assembly 10 near the light incident end and the imaging surface of the imaging lens on the optical axis. Half of the diagonal length of the effective pixel area on the imaging surface of the lens group 10 imgh= 8.165. TTL/imgh=1.15. The focal length fg2=7.15 of the middle group lens group 102 composed of the fifth lens 15 and the sixth lens 16. The ratio r 7/r8=4.13 of the front and rear radii of curvature r7, r8 of the fourth lens 14. The ratio f/f1=0.86 of the focal length of the first lens 11 to the total effective focal length of the lens assembly 10. The ratio f8/r16= -1.63 of the focal length of the eighth lens element 18 to the curvature radius of the image-side surface of the eighth lens element 18. The ratio f2/f6= -10.41 of the focal length of the second lens element 12 to the focal length of the sixth lens element 16. The ratio bfl/imgh=0.078 of the optical back focal length of the lens group 10 to half the diagonal length of the effective pixel area on the imaging surface of the lens group 10. ImgH/f=1.03.

The first lens element 11, the second lens element 12, the third lens element 13 and the fourth lens element 14 form a ratio fg 1/f=1.16 of the focal length of the upper lens group 101 to the total effective focal length of the lens assembly 10. The ratio fg 2/f=0.9 of the focal length of the middle lens group 102 composed of the fifth lens element 15 and the sixth lens element 16 to the total effective focal length of the lens assembly 10. The seventh lens 17 and the eighth lens 18 are formed by a ratio fg 3/f= -0.47 of a focal length fg3 of the lower lens group 103 to a total effective focal length fg 10 of the lens group.

Ratio ctg 1/ctg2=0.83 of spacing ctg1 between the upper group lens group 101 and the middle group lens group 102 to spacing ctg2 between the middle group lens group 102 and the lower group lens group 103. The ratio ctg 2/ctg3=0.86 between the interval ctg2 between the middle group lens group 102 and the lower group lens group 103 and the optical back focus, that is, the interval ctg3 between the lower group lens group 103 and the chip. The ratio Σct/Σct56=4.13 of the sum Σct of the center thicknesses of all lenses to the sum Σct56 of the center thicknesses of the two lenses (i.e., the fifth lens 15 and the sixth lens 16) of the middle group lens 102.

The ratio R5/f=5.21 of the radius of curvature of the object side surface of the third lens element 13 to the total effective focal length of the lens assembly 10. The ratio CT 1/t12=0.44 of the separation distance of the first lens 11 and the second lens 12 on the optical axis to the center thickness of the first lens 11 on the optical axis. (r2+r3)/(r2—r3) = -245.32. Where R2 is the radius of curvature of the image side of the first lens element 11 and R3 is the radius of curvature of the object side of the second lens element 12.

Fig. 11 shows an on-axis chromatic aberration curve of the lens group 10 of embodiment 4, which indicates the convergent focus deviation of light rays of different wavelengths after passing through the lens. Fig. 12 shows a distortion curve of the lens group 10 of embodiment 4, which represents distortion magnitude values corresponding to different image heights. As can be seen from fig. 11 and 12, the lens group 10 according to embodiment 4 can achieve good imaging quality.

The present application also provides an optical assembly 100, wherein the optical assembly 100 includes the lens assembly 10 and the driving assembly 20. Wherein, a part of the lens group 10 is disposed inside the driving assembly 20, and is held and driven by the driving assembly 20. In an alternative embodiment of the present application, the lens assembly 10 may include eight lenses having optical power, namely, a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a fifth lens 15, a sixth lens 16, a seventh lens 17 and an eighth lens 18, which are sequentially arranged from an object side to an image side along an optical axis. In some alternative embodiments, the upper lens group 101 of the lens group 10 includes the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14, the middle lens group 102 includes the fifth lens 15 and the sixth lens 16, and the lower lens group 103 includes the seventh lens 17 and the eighth lens 18. The upper group lens group 101 is disposed on the upper side of the driving component 20, the middle group lens group 102 is disposed in the driving component 20 or on the upper side, and the lower group lens group 103 is disposed in the driving component 20 to allow light to sequentially pass through the upper group lens group 101, the middle group lens group 102 and the lower group lens group 103 of the optical lens, and meanwhile, the position ratio of the lens groups to the driving component can realize the advantage of low shoulder height of the module.

Specifically, as shown in fig. 13, in an exemplary embodiment, the driving assembly 20 includes a housing, a focusing portion, an optical anti-shake portion, and a base, wherein the middle group lens group 102 is disposed inside the driving assembly 20, the focusing portion is configured to drive the middle group lens group 102 to move along a direction of an optical axis to achieve optical focusing, and the optical anti-shake portion is configured to drive at least a portion of the lens group 10 to move along a direction perpendicular to the optical axis to achieve optical anti-shake.

It should be noted that the positional relationship between the focusing portion and the optical anti-shake portion is not limited in the optical assembly 100 of the present invention. In other embodiments, the optical anti-shake portion may be located inside the focusing portion, and when the focusing portion drives the group lens assembly 102 to move along the direction of the optical axis, the optical anti-shake portion is simultaneously driven to move along the direction of the optical axis, so as to achieve the focusing effect in the shooting process.

In an exemplary embodiment, the middle group lens group 102 is disposed at the driving assembly 20, and the middle group lens group 102 can move along the optical axis to achieve focusing under the driving force of the driving assembly 20. In some exemplary embodiments, the middle group lens group 102 may also be driven by the driving assembly 20 to move in a plane perpendicular to the optical axis, thereby achieving optical anti-shake.

In the exemplary embodiment, the optical assembly 100 is moved by driving the middle group lens group 102 of the lens group 10 to solve the contradiction between the insufficient driving force of the driving assembly 20 and the increased size of the motor, so that the internal space of the driving assembly 20 can be effectively utilized, and the overall size space of the optical assembly 100 can be effectively utilized.

In the embodiment of the application, the middle group lens group 102 is configured such that the relative positions of the middle group lens group 102 with respect to the upper group lens group 101 and the lower group lens group 103 can be adjusted, wherein the upper group lens group 101 and the lower group lens group 103 are respectively fixed with the fixed part of the driving assembly 20, so that the middle group lens group 102 is arranged at the movable part of the driving assembly 20 during shooting, and the middle group lens group 102 is adjusted to a predetermined position to form a clear image, thereby meeting the design requirement of miniaturization of the optical assembly 100 while solving the problem that the driving force is insufficient when the driving assembly 20 drives the whole optical lens.

The middle group lens group 102 is arranged on the driving component 20 and connected with the movable part of the driving component 20, and the middle group lens group 102 can be driven by the focusing part to move along the direction of the optical axis, so that the focusing effect in the shooting process is realized; the lens group 10 or the middle group lens group 102 can be driven by the optical anti-shake part to move along the direction perpendicular to the optical axis, thereby realizing the anti-shake effect in the shooting process.

The application also provides a camera module, the optical assembly 100 is combined with a photosensitive assembly 200 to form the camera module, the photosensitive assembly 200 comprises at least one circuit board, at least one photosensitive chip and a filter element, the photosensitive chip is mounted on and electrically connected with the circuit board, and the filter element is kept on a photosensitive path of the photosensitive chip. The optical assembly 100 is held on the photosensitive path of the photosensitive assembly 200, so that the light entering the optical assembly 100 reaches the photosensitive chip of the photosensitive assembly 200 after passing through the optical assembly 100, thereby realizing imaging.

The foregoing has outlined the basic principles, features, and advantages of the present application. It will be understood by those skilled in the art that the present application is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present application, and various changes and modifications may be made therein without departing from the spirit and scope of the application, which is defined by the appended claims. The scope of the application is defined by the appended claims and equivalents thereof.

Claims (10)

1. The utility model provides a lens group, its characterized in that includes in order from the light incident end to the light outgoing end of lens group: a first lens 11; a second lens 12; a third lens 13; a fourth lens 14; a fifth lens 15; a sixth lens 16; a seventh lens 17; an eighth lens 18; wherein the first lens 11, the second lens 12, the third lens 13 and the fourth lens 14 form an upper group lens group, the fifth lens and the sixth lens form a middle group lens group, the seventh lens and the eighth lens form a lower group lens group, and the focal power of the upper group lens group is as follows: 0.094 < 1/fg1 < 0.12; the focal power of the middle group lens group is as follows: 0.14 < 1/fg2 < 0.16; the focal power of the lower group lens group is as follows: -0.266 < 1/fg3 < -0.25.

2. The lens assembly of claim 1, wherein the fifth lens and the sixth lens are configured to have a middle group lens group focal length fg2 that satisfies: 6.06 < fg2 < 7.21.

3. The lens group according to claim 1, wherein the TTL of the lens group and half of the diagonal length ImgH of the effective pixel region on the imaging surface of the lens group satisfy: 1.12 < TTL/ImgH < 1.36.

4. The lens group of claim 1, wherein the first lens focal length f1 and the total effective focal length f of the lens group satisfy: 10.51< f/f1<0.86.

5. The lens group of claim 1, wherein a radius of curvature r7 of the fourth lens object-side surface and a radius of curvature r8 of the fourth lens image-side surface satisfy: -0.38< r7/r8<4.134.

6. The lens group of claim 1, wherein a distance between the eighth lens focal length f8 and the eighth lens image side radius of curvature r16 is as follows: -1.63 < f8/r16 < -0.96.

7. The lens group of claim 1, wherein the second lens focal length f2 and the sixth lens image focal length f6 satisfy: -10.4 < f2/f6 < 18.4.

8. The lens group according to claim 1, wherein between an optical back focus bfl of the lens group and a half imgh of a diagonal length of an effective pixel region on an imaging surface of the lens group satisfies: 0.078 < bfl/imgh < 0.083.

9. An optical assembly, comprising:

a drive assembly; and

the lens group of any of claims 1 to 9, wherein a portion of the lens group is disposed inside the driving assembly.

10. A camera module, comprising:

a photosensitive assembly; and

the optical assembly of claim 9, wherein the optical assembly is mounted above the photosensitive assembly and remains in the optical path of the photosensitive assembly.