WO2022133651A1 - Optical system, photographing module, and electronic device - Google Patents

Abstract

An optical system, a lens module, and an electronic device. The optical system sequentially comprises, from an object side to an image side in an optical axis direction: a right-angle prism (E), the right-angle prism (E) comprising a light incident surface (A1), a reflecting surface (A2), and a light emitting surface (A3), and light vertically entering the light incident surface (A1), and being totally reflected by the reflecting surface (A2) and then emitted from the light emitting surface (A3); and a first lens (L1) to an eighth lens (L8), in which at least one plastic aspheric lens is comprised. The first lens (L1) and a second lens (L2) constitute a first lens group having negative refractive power; a third lens (L3) to a fifth lens (L5) constitute a second lens group having positive refractive power; and a sixth lens (L6) to the eighth lens (L8) constitute a third lens group having positive refractive power. The right-angle prism (E) is provided to deflect the light to form a folded periscopic structure, and the refractive power of the first lens (L1) to the eighth lens (L8) is reasonably set, such that a transverse distance is shortened, a space occupied by the optical system is reduced, and enough length is provided for the optical system to realize large-scale zoom.

Description

Optical systems, camera modules and electronic equipment technical field

The present application belongs to the technical field of optical imaging, and in particular relates to an optical system, a camera module and an electronic device.

Background technique

In recent years, there have been many mobile phones equipped with 3-camera and 4-camera lenses on the market. Such mobile phones can achieve ultra-clear shooting, wide-angle shooting and telephoto shooting by switching different lenses. On the one hand, this lens configuration meets the needs of users for taking pictures in different scenarios, but on the other hand, there are some disadvantages. For example, in order to obtain high zoom ratio characteristics, the total length of the optical system will be correspondingly longer, but it is limited by limited mobile phones. Therefore, how to further shorten the total length of the optical system and achieve a large-scale zoom while miniaturizing it has become one of the problems to be solved by the industry at present.

SUMMARY OF THE INVENTION

The purpose of the present application is to provide an optical system, a lens module and an electronic device, which can meet the requirements of large-scale zoom and miniaturization at the same time.

To achieve the purpose of the application, the application provides the following technical solutions:

In a first aspect, the present application provides and provides an optical system, comprising in sequence along the optical axis from the object side to the image side: a right angle prism, the right angle prism includes a light incident surface, a reflection surface and a light exit surface, the light incident surface It is vertically connected to the light-emitting surface, the reflective surface is connected to the light-incident surface and the light-emitting surface, the light enters the light-incident surface vertically, and is totally reflected by the reflective surface and exits from the light-emitting surface; a lens group, opposite to the light-emitting surface, and having negative refractive power, including a first lens and a second lens arranged in sequence along the optical axis; the second lens group, having positive refractive power, including a lens along the optical axis The third lens, the fourth lens and the fifth lens are arranged in sequence; the third lens group has positive refractive power, and includes the sixth lens, the seventh lens and the eighth lens which are arranged in sequence along the optical axis; the first lens The lenses to the eighth lens include at least one aspherical plastic lens.

By arranging the right-angle prism to deflect the light to form a folded periscope structure, and reasonably set by the refractive power of the first lens to the eighth lens, on the one hand, the lateral distance is shortened and the optical system is reduced. occupied space; on the other hand, sufficient length is provided for the optical system to achieve a wide range of zoom.

In one embodiment, the optical system is a zoom optical system, and the zoom optical system is provided with a long focal end and a short focal end. By making the optical system in two states of the long focal end and the short focal end, the relevant parameters of the optical system can be designed and adjusted to achieve the purpose of improving the imaging quality of the optical system.

In an embodiment, the optical system satisfies the conditional formula: Fc/Fd≥2.2; wherein, Fc is the effective focal length of the optical system at the long focal end, and Fd is the effective focal length of the optical system at the short focal end focal length. Satisfying the above relationship, it is possible to reasonably configure the ratio of the effective focal length at the telephoto end to the effective focal length at the short focal end, so that the optical system can obtain a higher zoom ratio, so as to achieve a wide range of shooting magnification, and achieve continuous zooming of the zoom lens group. characteristics, so that the zoom lens group can obtain good image quality. When Fc/Fd<2.2, the continuous zoom range is not enough to meet the user's higher requirements for shooting experience.

In one embodiment, the optical system satisfies the conditional formula: FOVc/ImgH<3.9; wherein, FOVc is the full field angle of the optical system at the telephoto end, and ImgH is the diagonal line of the effective photosensitive area on the imaging plane Half the length, the half-image height. Satisfying the above relationship, by configuring the ratio of the full field of view at the telephoto end to the half-image height within a reasonable range, it is beneficial to realize the telephoto characteristic of the telephoto end of the optical system, and at the same time, it can be matched with a higher pixel chip. Shot in HD.

In an embodiment, the optical system satisfies the conditional formula: 5.5<D2c/D2d<14; wherein, D2c is the image side surface of the fifth lens and the sixth lens when the optical system is at the telephoto end. The distance of the object side of the lens on the optical axis; D2d is the distance on the optical axis of the image side of the fifth lens and the image side of the sixth lens when the optical system is at the short focal end. Satisfying the above relational expression, by controlling the ratio of the distance on the optical axis between the image side of the fifth lens and the object side of the sixth lens and the image side on the optical axis when the optical system is at the long focal end and the short focal end, it is beneficial to make The optical system obtains a larger zoom range and achieves a shooting effect with a larger magnification. In addition, the reasonable distance control of the image side of the fifth lens and the image side of the sixth lens on the optical axis can also reduce the required distance. The processing and assembly difficulty of the optical system is further improved, and the processing performance is further improved. When D2c/D2d≤5.5, it is unfavorable to widen the zoom range of the optical system; when D2c/D2d≥14, the distance between the second lens group and the third lens group is too small in the short focus state, It will increase the difficulty of assembly, and it is also prone to the phenomenon of unsmoothness or lens collision when implementing continuous zooming.

In one embodiment, the optical system satisfies the conditional formula: 2.5<et12/ct12<7.5; wherein et12 is the horizontal distance from the image side of the second lens to the object side of the third lens at the effective diameter , ct12 is the distance on the optical axis from the image side of the second lens to the object side of the third lens. Satisfying the above relationship, by keeping the ratio between the distance between the first lens group and the second lens group and the distance between the edges within a reasonable range, it is beneficial for the marginal light to transition from the first lens group to the other at a relatively small and reasonable angle. The second lens group is beneficial to the second lens group to correct the aberration of the first lens group, and is also beneficial to molding, manufacturing, processing and assembly. When et12/ct12≤2.5, the distance between the effective diameter of the first lens group and the second lens group is too large, which will cause the deflection angle of the light entering the second lens group to be too large; et12/ When ct12≥7.5, the distance between the effective diameter of the first lens group and the second lens group is too small, which is not conducive to processing and assembly, and increases the difficulty of assembly.

In an embodiment, the optical system satisfies the conditional formula: 4<fg3/g3<7.5; wherein, fg3 is the effective focal length of the third lens group, and g3 is the distance from the object side of the sixth lens to the The distance of the image side of the eight lenses on the optical axis. Satisfying the above relationship, the third lens group bears part of the positive refractive power, and controlling the proportion of the positive refractive power contributed by the third lens group to the optical system is conducive to correcting the negative refractive power of the The aberration generated by the first lens group further improves the imaging quality of the optical system; in addition, controlling the total length of the third lens group is beneficial to shorten the total length of the optical system and realize the miniaturization of the optical system. When fg3/g3≥7.5, the third lens group does not provide sufficient positive refractive power, which is not conducive to correcting the aberration generated by the front lens group and affects the image quality; when fg3/g3≤4, the third lens group The total length of the group is too long, which is not conducive to shortening the total length of the optical system.

In an embodiment, the optical system satisfies the conditional formula: 1<Fc/(f3+fjh2)<1.3; wherein, Fc is the effective focal length of the optical system at the telephoto end, and f3 is the third lens effective focal length; fjh2 is the effective focal length of the fourth lens and the fifth lens, and the fourth lens and the fifth lens are cemented to form a cemented lens. When the above relationship is satisfied, the ratio of the effective focal length at the telephoto end to the sum of the effective focal lengths of the third lens and the cemented lens is reasonably configured, which is conducive to achieving telephoto characteristics and also helps to expand the zoom ratio of the optical system. In addition, the second lens group bears the positive refractive power required by the optical system, can effectively correct the spherical aberration generated by the front lens group, and is beneficial to improve the resolution of the optical system.

In an embodiment, the optical system satisfies the conditional formula: 1.2<|R71|/R82<5.2; wherein, R71 is the curvature radius of the object side of the seventh lens on the optical axis, and R82 is the curvature radius of the seventh lens. The value of the radius of curvature of the eight-lens image side on the optical axis. Satisfying the above relational formula, controlling the ratio of the radius of curvature of the object side of the seventh lens on the optical axis to the value of the radius of curvature of the image side of the eighth lens on the optical axis is within a reasonable range. The effective constraints on the shapes of the seventh lens and the eighth lens enable the seventh lens and the eighth lens to cooperate with each other to jointly contribute to aberrations, thereby improving the imaging quality of the optical system. When |R71|/R82≤1.2 or |R71|/R82≥5.2, the aberration provided by the combination of the shapes of the seventh lens and the eighth lens cannot make the overall aberration of the optical system reach a reasonable level Balanced state.

In one embodiment, the optical system satisfies the conditional formula: 5<f8/ct8<50; where f8 is the effective focal length of the eighth lens, and ct8 is the thickness of the eighth lens on the optical axis, that is, Medium thickness. Satisfying the above relationship, by reasonably configuring the ratio between the effective focal length of the eighth lens and the thickness of the eighth lens, on the one hand, the aberration allocated to the eighth lens by the entire optical system can be controlled, so that the optical system can be controlled. The aberration is at a reasonable level to obtain good imaging quality. On the other hand, it can help to further shorten the total length of the optical system, constrain the shape of the eighth lens, and make the optical system have good processing performance.

In a second aspect, the present application also provides a camera module, the camera module includes a lens barrel, an electronic photosensitive element, and the optical system described in the above-mentioned embodiments, wherein the first lens of the optical system reaches the The eighth lens is all installed in the lens barrel, and the electronic photosensitive element is arranged on the image side of the optical system, and is used to pass through the right-angle prism to the eighth lens and enter the electronic photosensitive element. The light on the object is converted into the electrical signal of the image. In the present invention, the right-angle prism to the eighth lens of the optical system are installed in the camera module, and the surface shape and refractive power of each lens of the first lens to the eighth lens are reasonably arranged, so that the camera module can meet the requirements of large-scale zoom and requirements for miniaturization.

In a third aspect, the present application further provides an electronic device, the electronic device includes a casing and the camera module described in the second aspect, wherein the camera module is arranged in the casing. By adding the camera module provided by the present invention to the electronic device, the electronic device can meet the requirements of large-scale zoom and miniaturization at the same time.

To sum up, the present invention can reduce the lateral length and overall height of the camera module by setting a right-angle prism that can change the direction of the light path, and when installing, the camera module can be placed horizontally in the housing of the electronic equipment, and the number of pixels can be gradually increased. Increasing, the zoom range is gradually expanding and the requirements for the miniaturization of the optical image taking lens, and then the miniaturization requirements of the electronic equipment are realized.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings that are used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

1a is a schematic structural diagram of the optical system of the first embodiment at a short focal end;

Fig. 1b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment at the short focal end;

1c is a schematic structural diagram of the optical system in the first embodiment at the mid-focus end;

Fig. 1d is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment at the middle focal end;

1e is a schematic structural diagram of the optical system of the first embodiment at the telephoto end;

Fig. 1f is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment at the telephoto end;

2a is a schematic structural diagram of the optical system of the second embodiment at the short focal end;

Fig. 2b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment at the short focal end;

2c is a schematic structural diagram of the optical system in the second embodiment at the mid-focus end;

Fig. 2d is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment at the middle focal end;

2e is a schematic structural diagram of the optical system of the second embodiment at the telephoto end;

Fig. 2f is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment at the telephoto end;

3a is a schematic structural diagram of the optical system of the third embodiment at the short focal end;

Fig. 3b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment at the short focal end;

3c is a schematic structural diagram of the optical system in the third embodiment at the mid-focus end;

Fig. 3d is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment at the middle focal end;

3e is a schematic structural diagram of the optical system of the third embodiment at the telephoto end;

Fig. 3f is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment at the telephoto end;

4a is a schematic structural diagram of the optical system of the fourth embodiment at the short focal end;

Fig. 4b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system at the short focal end of the fourth embodiment;

FIG. 4c is a schematic structural diagram of the optical system at the middle focal end of the fourth embodiment;

Fig. 4d is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system at the middle focal end of the fourth embodiment;

4e is a schematic structural diagram of the optical system of the fourth embodiment at the telephoto end;

4f is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system at the telephoto end of the fourth embodiment;

5a is a schematic structural diagram of the optical system of the fifth embodiment at the short focal end;

Fig. 5b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment at the short focal end;

5c is a schematic structural diagram of the optical system of the fifth embodiment at the mid-focus end;

Fig. 5d is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system at the middle focal end of the fifth embodiment;

5e is a schematic structural diagram of the optical system of the fifth embodiment at the telephoto end;

Fig. 5f is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system at the telephoto end of the fifth embodiment;

6a is a schematic structural diagram of the optical system of the sixth embodiment at the short focal end;

Fig. 6b is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment at the short focal end;

6c is a schematic structural diagram of the optical system of the sixth embodiment at the mid-focus end;

Fig. 6d is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment at the middle focal end;

6e is a schematic structural diagram of the optical system of the sixth embodiment at the telephoto end;

FIG. 6f is the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment at the telephoto end.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

The optical system provided by the embodiment of the present application includes, from the object side to the image side along the optical axis: a right angle prism, the right angle prism includes a light incident surface, a reflection surface and a light exit surface, the light entrance surface and the light exit surface are vertically connected, and the reflection surface is connected to the The light surface and the light-emitting surface, the light enters the light-incident surface vertically, and exits from the light-emitting surface after being totally reflected by the reflective surface; the first lens group is opposite to the light-emitting surface and has a negative refractive power, including the first lens group arranged in sequence along the optical axis. A lens and a second lens; a second lens group with positive refractive power, including a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis; the third lens group with positive refractive power, including sequentially along the optical axis The sixth lens, the seventh lens and the eighth lens are arranged; the first lens to the eighth lens comprise at least one aspherical plastic lens.

By arranging right-angle prisms to deflect the light to form a folded periscope structure, and by rationally setting the refractive power of the first lens to the eighth lens, on the one hand, the lateral distance is shortened and the space occupied by the optical system is reduced. ; On the other hand, it provides enough length to the optical system to achieve a wide range of zoom.

In one embodiment, the optical system is a zoom optical system, and the zoom optical system is provided with a long focal end and a short focal end. The telephoto end is the state when the focal length of the optical system is the largest, and the short focal end is the state when the focal length of the optical system is the smallest. By making the optical system in two states of the long focal end and the short focal end, the relevant parameters of the optical system can be designed and adjusted to achieve the purpose of improving the imaging quality of the optical system.

In one embodiment, the optical system satisfies the conditional formula: Fc/Fd≥2.2; wherein, Fc is the effective focal length of the optical system at the long focal end, and Fd is the effective focal length of the optical system at the short focal end. If the above relationship is satisfied, the ratio of the effective focal length at the telephoto end to the effective focal length at the short focal end can be reasonably configured, so that the optical system can obtain a higher zoom ratio, so as to achieve a wide range of shooting magnification, so as to achieve the characteristics of continuous zooming of the zoom lens group. Make the zoom lens group obtain good image quality. When Fc/Fd<2.2, the continuous zoom range is not enough to meet the user's higher requirements for shooting experience.

In one embodiment, the optical system satisfies the conditional formula: FOVc/ImgH<3.9; wherein, FOVc is the full field angle of the optical system at the telephoto end, and ImgH is half of the diagonal length of the effective photosensitive area on the imaging plane, That is, half image height. Satisfying the above relationship, by configuring the ratio of the full field of view at the telephoto end to the half-image height within a reasonable range, it is beneficial to realize the telephoto characteristics of the optical system at the telephoto end, and at the same time, it can match the chip with higher pixel, Realize high-definition shooting.

In one embodiment, the optical system satisfies the conditional formula: 5.5<D2c/D2d<14; wherein, D2c is the image side of the fifth lens and the object side of the sixth lens on the optical axis when the optical system is at the telephoto end D2d is the distance between the image side of the fifth lens and the image side of the sixth lens on the optical axis when the optical system is at the short focal end. Satisfying the above relational expression, by controlling the ratio of the distance on the optical axis between the image side of the fifth lens and the object side of the sixth lens and the image side when the optical system is at the long focal end and the short focal end, it is beneficial to make the optical system obtain more The large zoom range can realize the shooting effect of larger magnification. In addition, the reasonable distance control of the image side of the fifth lens and the image side of the sixth lens on the optical axis can also reduce the difficulty of processing and assembling the optical system and further improve the processing performance. . When D2c/D2d≤5.5, it is not conducive to widening the zoom range of the optical system; when D2c/D2d≥14, the distance between the second lens group and the third lens group is too small in the short focus state, which will increase the difficulty of assembly and also It is easy to appear unsmooth or lens collision during continuous zooming.

In one embodiment, the optical system satisfies the conditional formula: 2.5<et12/ct12<7.5; wherein et12 is the horizontal distance from the image side of the second lens to the object side of the third lens at the effective diameter, and ct12 is the second lens The distance from the image side to the object side of the third lens on the optical axis. Satisfying the above relationship, by keeping the ratio between the distance between the first lens group and the second lens group and the edge distance within a reasonable range, it is beneficial for the marginal light to transition from the first lens group to the second lens at a smaller and reasonable angle At the same time, it is beneficial for the second lens group to correct the aberration of the first lens group, and it is also beneficial for molding, manufacturing, processing and assembling. When et12/ct12≤2.5, the distance between the effective diameter of the first lens group and the second lens group is too large, which will cause the deflection angle of the light entering the second lens group to be too large; when et12/ct12≥7.5, The distance between the effective diameter of the first lens group and the second lens group is too small, which is not conducive to processing and assembly, and increases the difficulty of assembly. The distance between the effective diameter of the first lens group and the second lens group is the distance from the effective diameter of the image side of the second lens to the effective diameter of the object side of the third lens in the direction of the optical axis.

In one embodiment, the optical system satisfies the conditional formula: 4<fg3/g3<7.5; wherein, fg3 is the effective focal length of the third lens group, and g3 is the optical axis from the object side of the sixth lens to the image side of the eighth lens. on the distance. Satisfying the above relationship, the third lens group bears part of the positive refractive power, and the proportion of the positive refractive power contributed by the third lens group to the optical system is controlled, which is beneficial to correct the aberration generated by the first lens group with negative refractive power , thereby improving the imaging quality of the optical system; in addition, controlling the total length of the third lens group is beneficial to shorten the total length of the optical system and realize the miniaturization of the optical system. When fg3/g3 ≥ 7.5, the third lens group does not provide enough positive refractive power, which is not conducive to correcting the aberrations generated by the front lens group and affects the image quality; when fg3/g3 ≤ 4, the total length of the third lens group is too long , which is not conducive to shortening the overall length of the optical system.

In an embodiment, the optical system satisfies the conditional formula: 1<Fc/(f3+fjh2)<1.3; wherein, Fc is the effective focal length of the optical system at the telephoto end, f3 is the effective focal length of the third lens; fjh2 is The effective focal length of the fourth lens and the fifth lens, the fourth lens and the fifth lens are cemented to form a cemented lens. When the above relationship is satisfied, the ratio of the effective focal length of the telephoto end to the sum of the effective focal length of the third lens and the cemented lens is reasonably configured, which is conducive to realizing the telephoto characteristic and also helping to expand the zoom ratio of the optical system; in addition, the second lens group It bears the positive refractive power required by the optical system, can effectively correct the spherical aberration generated by the front lens group, and is conducive to improving the resolution of the optical system.

In one embodiment, the optical system satisfies the conditional formula: 1.2<|R71|/R82<5.2; wherein, R71 is the curvature radius value of the object side of the seventh lens on the optical axis, and R82 is the image side of the eighth lens at The value of the radius of curvature on the optical axis. Satisfying the above relational formula, controlling the ratio of the radius of curvature of the object side of the seventh lens on the optical axis to the value of the radius of curvature of the image side of the eighth lens on the optical axis is within a reasonable range. The effective constraint of the shape of the eighth lens enables the seventh lens and the eighth lens to cooperate with each other to contribute to aberrations, thereby improving the imaging quality of the optical system. When |R71|/R82≤1.2 or |R71|/R82≥5.2, the aberration provided by the combination of the shapes of the seventh lens and the eighth lens cannot make the overall aberration of the optical system reach a reasonable balance.

In one embodiment, the optical system satisfies the conditional formula: 5<f8/ct8<50; where f8 is the effective focal length of the eighth lens, and ct8 is the thickness of the eighth lens on the optical axis, that is, the medium thickness. Satisfying the above relationship, by reasonably configuring the ratio between the effective focal length of the eighth lens and the thickness of the eighth lens, on the one hand, the aberration allocated to the eighth lens of the entire optical system can be controlled, so that the aberration of the optical system is at a reasonable level and then To obtain good imaging quality, on the other hand, it can help to further shorten the total length of the optical system, constrain the shape of the eighth lens, and make the optical system have good processing performance.

An embodiment of the present application provides a camera module. The camera module includes a lens barrel, an electronic photosensitive element, and the optical system provided by the embodiment of the present invention. The first lens to the eighth lens are all installed in the lens barrel, and the electronic photosensitive element is installed in the lens barrel. It is arranged on the image side of the optical system, and is used to convert the light of the object incident on the electronic photosensitive element through the right angle prism to the eighth lens into the electrical signal of the image. The electronic photosensitive element may be a complementary metal oxide semiconductor (Complementary Metal Oxide Semiconductor, CMOS) or a charge-coupled device (Charge-coupled Device, CCD). The camera module can be an independent lens of a digital camera, or an imaging module integrated on an electronic device such as a smart phone. In the present invention, the right-angle prism to the eighth lens of the optical system are installed in the camera module, and the surface shape and refractive power of each lens of the first lens to the eighth lens are reasonably arranged, so that the camera module can meet the requirements of large-scale zoom and requirements for miniaturization.

The embodiment of the present application provides an electronic device, and the electronic device includes a casing and the camera module provided by the embodiment of the present invention. The camera module and the electronic photosensitive element are arranged in the casing. The electronic device may be a smart phone, a personal digital assistant (PDA), a tablet computer, a smart watch, a drone, an electronic book reader, a driving recorder, a wearable device, and the like. By adding the camera module provided by the present invention to the electronic device, the electronic device can meet the requirements of large-scale zoom and miniaturization at the same time.

first embodiment

Referring to FIGS. 1a to 1f, the optical system of this embodiment sequentially includes:

Right angle prism E, prism E has an incident surface A1, a reflection surface A2 and an exit surface A3. It can be understood that when the light from the subject enters the prism E vertically through the incident surface A1, it can be totally reflected by the reflective surface A2 and turned to the exit surface A3 to exit along the direction of the optical axis, and enter the lens part;

The first lens L1 and the first lens L1 have negative refractive power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces at the near optical axis; the object side S1 and the image side S2 of the first lens L1 are near the optical axis. The circumference is convex.

The second lens L2 has a positive refractive power, and the second lens L2 is cemented with the first lens L1. Since the second lens L2 is cemented with the first lens L1, the object side of the second lens L2 coincides with the image side S2 of the first lens L1. In this embodiment and other embodiments, the object side of the second lens L2 still uses S2 express. The object side S2 and the image side S3 of the second lens L2 are convex at the near optical axis; the object side S2 of the second lens L2 is concave near the circumference, and the image side S3 is convex near the circumference.

The third lens L3 has a positive refractive power, and the object side S4 and the image side S5 of the third lens L3 are convex at the near optical axis; the object side S4 of the third lens L3 is convex at the near circumference, and the image side S5 is at Near the circumference is concave.

The fourth lens L4 has a positive refractive power, and the object side S6 and the image side S7 of the fourth lens are convex at the near optical axis; the object side S6 and the image side S7 of the fourth lens L4 are both concave at the near circumference.

The fifth lens L5 has a negative refractive power. Since the fifth lens L5 is cemented with the fourth lens L4, the object side surface of the fifth lens L5 coincides with the image side S7 of the fourth lens L4. In this embodiment and other embodiments, The object side of the fifth lens L5 is still denoted by S7. The object side S7 and the image side S8 of the fifth lens L5 are both concave at the near optical axis; the object side S7 and the image side S8 of the fifth lens L5 are both convex near the circumference.

The sixth lens L6 has a negative refractive power, and the object side S9 and the image side S10 of the sixth lens are concave at the near optical axis; the object side S9 and the image side S10 of the sixth lens L6 are both concave near the circumference.

The seventh lens L7 has negative refractive power, the object side S11 of the seventh lens L7 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 of the seventh lens L7 is near the circumference. Concave, like side S12 is convex near the circumference.

The eighth lens L8 has a positive refractive power, and the object side S13 and the image side S14 of the eighth lens L8 are convex surfaces at the near optical axis; the object side S13 of the eighth lens L8 is a convex surface near the circumference, and the image side S14 is at Near the circumference is concave.

The material of the first lens L1 to the eighth lens L8 is plastic or glass. At least one lens among the first lens L1 to the eighth lens L8 is an aspherical plastic lens.

In addition, the optical system also includes a diaphragm STO, an infrared cut filter IR, and an imaging surface IMG. In this embodiment, the diaphragm STO is arranged between the second lens L2 and the third lens L3 to control the amount of incoming light. In other embodiments, the stop STO may also be disposed between two other adjacent lenses, or on other lenses. The infrared cut filter IR is arranged between the image side S14 of the eighth lens L8 and the imaging surface IMG, which includes the object side S15 and the image side S16, and the infrared cut filter IR is used to filter out infrared rays, so that the incident imaging The light of the surface IMG is visible light, and the wavelength of visible light is 380nm-780nm. The IR cut filter is made of glass (GLASS) and can be coated on glass. The effective pixel area of the electronic photosensitive element is located on the imaging plane IMG.

Table 1a(1)-Table 1a(2) are tables showing the characteristics of the optical system of this embodiment, wherein the focal length, material refractive index and Abbe number are all obtained from visible light with a reference wavelength of 587.6 nm, Y radius, The units of thickness and effective focal length are both millimeters (mm).

Table 1a(1)

Table 1a(2)

variable distance	D1	D2	D3	EFL(mm)	FNO	FOV(°)	TTL(mm)
short focus position	9.7871	1.3209	5.5264	13.00	2.80	26.47	33.20
Mid focus position	5.5359	5.4542	4.3427	17.82	3.43	19.21	31.90
telephoto position	0.1000	12.9164	3.0176	29.75	4.83	11.55	32.60

Among them, D1, D2, and D3 are the on-axis distances from the current surface to the next surface, EFL is the effective focal length of the optical system, FNO is the aperture number of the optical system, FOV is the maximum field of view of the optical system, and TTL is the first The distance on the optical axis from the object side S1 of the lens L1 to the imaging surface IMG.

In this embodiment, the object side surface and the image side surface of the first lens L1 to the eighth lens L8 are all aspherical surfaces, and the surface type x of the aspherical surface can be defined by but not limited to the following aspherical surface formula:

Among them, x is the distance vector height of the aspheric surface from the vertex of the aspheric surface when the height is h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1/R (that is, the paraxial curvature c is the above table In 1a(1), the reciprocal of the Y radius R); k is the conic coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 1b gives higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for the aspheric mirror surfaces S1 to S14 in the first embodiment.

Table 1b

Fig. 1a shows a schematic structural diagram of the optical system of the first embodiment at the short focal end. Fig. 1b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment at the short focal end. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatic curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of distortion corresponding to different field angles . It can be seen from FIG. 1 b that the optical system provided in the first embodiment can achieve good imaging quality.

FIG. 1c shows a schematic structural diagram of the optical system of the first embodiment at the mid-focal end. Fig. 1d shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the first embodiment at the mid-focal end. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatic curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of distortion corresponding to different field angles . It can be seen from FIG. 1d that the optical system provided in the first embodiment can achieve good imaging quality.

FIG. 1e shows a schematic structural diagram of the optical system of the first embodiment at the telephoto end. Fig. 1f shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the first embodiment at the telephoto end. Among them, the longitudinal spherical aberration curve represents the deviation of the focal point of light of different wavelengths after passing through each lens of the optical system; the astigmatic curve represents the curvature of the meridional image plane and the curvature of the sagittal image plane; the distortion curve represents the magnitude of distortion corresponding to different field angles . It can be seen from FIG. 1f that the optical system provided in the first embodiment can achieve good imaging quality.

Second Embodiment

Please refer to FIG. 2a to FIG. 2f. The optical system of this embodiment includes sequentially from the object side to the image side along the optical axis direction:

Right angle prism E, prism E has an incident surface A1, a reflection surface A2 and an exit surface A3. It can be understood that when the light from the subject enters the prism E vertically through the incident surface A1, it can be totally reflected by the reflective surface A2 and turned to the exit surface A3 to exit along the direction of the optical axis, and enter the lens part;

The first lens L1 and the first lens L1 have negative refractive power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces at the near optical axis; the object side S1 and the image side S2 of the first lens L1 are near the optical axis. The circumference is convex.

The second lens L2 has a positive refractive power, and the second lens L2 is cemented with the first lens L1. The object side S2 and the image side S3 of the second lens L2 are convex at the near optical axis; the object side S2 of the second lens L2 is concave near the circumference, and the image side S3 is convex near the circumference.

The third lens L3 has a positive refractive power, and the object side S4 and the image side S5 of the third lens L3 are convex at the near optical axis; the object side S4 of the third lens L3 is convex at the near circumference, and the image side S5 is at Near the circumference is concave.

The 4th lens L4 has positive refractive power, and the object side S6 and the image side S7 of the 4th lens are convex surfaces at the near optical axis; The object side S6 and the image side S7 of the 4th lens L4 are concave surfaces at the near circumference.

The fifth lens L5 has negative refractive power, and the object side S7 and the image side S8 of the fifth lens L5 are concave surfaces at the near optical axis; the object side S7 and the image side S8 of the fifth lens L5 are convex surfaces at the near circumference .

The sixth lens L6 has a negative refractive power, and the object side S9 and the image side S10 of the sixth lens are concave at the near optical axis; the object side S9 and the image side S10 of the sixth lens L6 are both concave near the circumference.

The seventh lens L7 has a negative refractive power, and the object side S11 and the image side S12 of the seventh lens L7 are convex surfaces at the near optical axis; the object side S11 of the seventh lens L7 is a convex surface near the circumference, and the image side S12 is at Near the circumference is concave.

The eighth lens L8 has positive refractive power, the object side S13 of the eighth lens L8 is concave at the near optical axis, and the image side S14 is convex at the near optical axis; the object side S13 of the eighth lens L8 is near the circumference. It is a convex surface, and the image side S14 is a concave surface near the circumference.

Other structures of the second embodiment are the same as those of the first embodiment, which can be referred to.

Table 2a(1)-Table 2a(2) are tables showing the characteristics of the optical system of this embodiment, wherein the focal length, material refractive index and Abbe number are all obtained from visible light with a reference wavelength of 587.6 nm, Y radius, The units of thickness and effective focal length are both millimeters (mm).

Table 2a(1)

Table 2a(2)

variable distance	D1	D2	D3	EFL(mm)	FNO	FOV(°)	TTL(mm)
short focus position	9.6326	1.9173	5.6317	13.51	2.91	25.37	33.20
Mid focus position	5.7509	5.6390	4.4897	17.82	3.45	19.13	31.90
telephoto position	0.1000	13.3843	2.8640	30.00	4.89	11.42	32.37

Wherein, the meanings of the parameters in Table 2a(2) are the same as the meanings of the parameters in the first embodiment.

Table 2b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 2b

Fig. 2a shows a schematic structural diagram of the optical system of the second embodiment at the short focal end. FIG. 2b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment at the short focal end. It can be seen from FIG. 2b that the optical system provided in the second embodiment can achieve good imaging quality.

FIG. 2c shows a schematic structural diagram of the optical system of the second embodiment at the middle focal end. FIG. 2d shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment at the mid-focal end. It can be seen from FIG. 2d that the optical system provided in the second embodiment can achieve good imaging quality.

FIG. 2e shows a schematic structural diagram of the optical system of the second embodiment at the telephoto end. FIG. 2f shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the second embodiment at the telephoto end. It can be seen from FIG. 2f that the optical system provided in the second embodiment can achieve good imaging quality.

Third Embodiment

Please refer to FIG. 3a to FIG. 3f. The optical system of this embodiment, from the object side to the image side along the optical axis direction, sequentially includes:

Right angle prism E, prism E has an incident surface A1, a reflection surface A2 and an exit surface A3. It can be understood that when the light from the subject enters the prism E vertically through the incident surface A1, it can be totally reflected by the reflective surface A2 and turned to the exit surface A3 to exit along the direction of the optical axis, and enter the lens part;

The first lens L1 and the first lens L1 have negative refractive power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces at the near optical axis; the object side S1 and the image side S2 of the first lens L1 are near the optical axis. The circumference is convex.

The second lens L2 has a positive refractive power, and the second lens L2 is cemented with the first lens L1. The object side S2 of the second lens L2 and the image side S3 are convex surfaces at the near optical axis; the object side S2 of the second lens L2 is a concave surface at the near circumference, and the image side S3 is a convex surface at the near circumference.

The third lens L3 has a positive refractive power, and the object side S4 and the image side S5 of the third lens L3 are convex at the near optical axis; the object side S4 of the third lens L3 is convex at the near circumference, and the image side S5 is at Near the circumference is concave.

The fourth lens L4 has a positive refractive power, and the object side S6 and the image side S7 of the fourth lens are convex at the near optical axis; the object side S6 and the image side S7 of the fourth lens L4 are both concave at the near circumference.

The fifth lens L5 has negative refractive power, and the object side S7 and the image side S8 of the fifth lens L5 are concave surfaces at the near optical axis; the object side S7 and the image side S8 of the fifth lens L5 are convex surfaces at the near circumference .

The sixth lens L6 has negative refractive power, and the object side S9 and the image side S10 of the sixth lens are concave at the near optical axis; the object side S9 of the sixth lens L6 is convex near the circumference, and the image side S10 is near the circumference. The circumference is concave.

The seventh lens L7 has negative refractive power, the object side S11 of the seventh lens L7 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 of the seventh lens L7 is near the circumference. Concave, like side S12 is convex near the circumference.

The eighth lens L8 has a positive refractive power, and the object side S13 and the image side S14 of the eighth lens L8 are convex surfaces at the near optical axis; the object side S13 of the eighth lens L8 is a convex surface near the circumference, and the image side S14 is at Near the circumference is concave.

Other structures of the third embodiment are the same as those of the first embodiment, which can be referred to.

Tables 3a(1) to 3a(2) are tables showing the characteristics of the optical system of this embodiment, in which the focal length, the material refractive index and the Abbe number are all obtained from visible light with a reference wavelength of 587.6 nm, the Y radius, The units of thickness and effective focal length are both millimeters (mm).

Table 3a(1)

Table 3a(2)

variable distance	D1	D2	D3	EFL(mm)	FNO	FOV(°)	TTL(mm)
short focus position	10.3179	0.9641	5.5421	12.51	2.77	27.54	33.20
Mid focus position	6.1787	4.9911	4.3433	17.00	3.32	20.13	31.89
telephoto position	0.0938	13.1015	2.9798	30.00	4.84	11.45	32.55

Wherein, the meanings of the parameters in Table 3a(2) are the same as the meanings of the parameters in the first embodiment.

Table 3b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 3b

Fig. 3a shows a schematic structural diagram of the optical system of the third embodiment at the short focal end. Fig. 3b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment at the short focal end. It can be seen from FIG. 3b that the optical system provided in the third embodiment can achieve good imaging quality.

FIG. 3c shows a schematic structural diagram of the optical system of the third embodiment at the middle focal end. FIG. 3d shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the third embodiment at the mid-focal end. It can be seen from FIG. 3d that the optical system provided in the third embodiment can achieve good imaging quality.

FIG. 3e shows a schematic structural diagram of the optical system of the third embodiment at the telephoto end. FIG. 3f shows longitudinal spherical aberration curves, astigmatism curves and distortion curves of the optical system of the third embodiment at the telephoto end. It can be seen from FIG. 3f that the optical system provided in the third embodiment can achieve good imaging quality.

Fourth Embodiment

Referring to FIGS. 4a to 4f , the optical system of this embodiment, from the object side to the image side along the optical axis direction, sequentially includes:

Right angle prism E, prism E has an incident surface A1, a reflection surface A2 and an exit surface A3. It can be understood that when the light from the subject enters the prism E vertically through the incident surface A1, it can be totally reflected by the reflective surface A2 and turned to the exit surface A3 to exit along the direction of the optical axis, and enter the lens part;

The first lens L1 and the first lens L1 have negative refractive power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces at the near optical axis; the object side S1 and the image side S2 of the first lens L1 are near the optical axis. The circumference is convex.

The second lens L2 has a positive refractive power, and the second lens L2 is cemented with the first lens L1. The object side S2 and the image side S3 of the second lens L2 are convex at the near optical axis; the object side S2 of the second lens L2 is concave near the circumference, and the image side S3 is convex near the circumference.

The third lens L3 has a positive refractive power, and the object side S4 and the image side S5 of the third lens L3 are convex at the near optical axis; the object side S4 of the third lens L3 is convex at the near circumference, and the image side S5 is at Near the circumference is concave.

The fourth lens L4 has a positive refractive power, and the object side S6 and the image side S7 of the fourth lens are convex at the near optical axis; the object side S6 and the image side S7 of the fourth lens L4 are both concave at the near circumference.

The fifth lens L5 has negative refractive power, and the object side S7 and the image side S8 of the fifth lens L5 are concave surfaces at the near optical axis; the object side S7 and the image side S8 of the fifth lens L5 are convex surfaces at the near circumference .

The sixth lens L6 has a negative refractive power, and the object side S9 and the image side S10 of the sixth lens are concave at the near optical axis; the object side S9 and the image side S10 of the sixth lens L6 are both concave near the circumference.

The seventh lens L7 has a negative refractive power, and the object side S11 of the seventh lens L7 is convex at the near optical axis, and the image side S12 and the near optical axis are concave; the object side S11 of the seventh lens L7 is near the circumference. Convex, like side S12 is concave near the circumference.

The eighth lens L8 has positive refractive power, the object side S13 of the eighth lens L8 is concave at the near optical axis, and the image side S14 is convex at the near optical axis; the object side S13 of the eighth lens L8 is near the circumference. Convex, like side S14 is concave near the circumference.

Other structures of the fourth embodiment are the same as those of the first embodiment, and can be referred to.

Table 4a(1)-Table 4a(2) are tables showing the characteristics of the optical system of this embodiment, in which the focal length, material refractive index and Abbe number are all obtained from visible light with a reference wavelength of 587.6 nm, Y radius, The units of thickness and effective focal length are both millimeters (mm).

Table 4a(1)

Table 4a(2)

variable distance	D1	D2	D3	EFL(mm)	FNO	FOV(°)	TTL(mm)
short focus position	8.4385	0.9456	5.9131	13.87	2.85	24.61	30.40

Mid focus position	5.4981	3.2466	5.4528	16.99	3.22	20.03	29.30
telephoto position	0.0800	12.7536	2.4637	30.49	4.85	11.24	30.40

Wherein, the meanings of the parameters in Table 4a(2) are the same as the meanings of the parameters in the first embodiment.

Table 4b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 4b

FIG. 4a shows a schematic structural diagram of the optical system of the fourth embodiment at the short focal end. FIG. 4b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fourth embodiment at the short focal end. It can be seen from FIG. 4b that the optical system provided in the fourth embodiment can achieve good imaging quality.

FIG. 4c shows a schematic structural diagram of the optical system of the fourth embodiment at the middle focal end. FIG. 4d shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fourth embodiment at the mid-focal end. It can be seen from FIG. 4d that the optical system provided in the fourth embodiment can achieve good imaging quality.

FIG. 4e shows a schematic structural diagram of the optical system of the fourth embodiment at the telephoto end. FIG. 4f shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fourth embodiment at the telephoto end. It can be seen from FIG. 4f that the optical system provided in the fourth embodiment can achieve good imaging quality.

Fifth Embodiment

5a to 5f, the optical system of this embodiment, from the object side to the image side along the optical axis direction, sequentially includes:

Right angle prism E, prism E has an incident surface A1, a reflection surface A2 and an exit surface A3. It can be understood that when the light from the subject enters the prism E vertically through the incident surface A1, it can be totally reflected by the reflective surface A2 and turned to the exit surface A3 to exit along the direction of the optical axis, and enter the lens part;

The first lens L1 and the first lens L1 have negative refractive power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces at the near optical axis; the object side S1 and the image side S2 of the first lens L1 are near the optical axis. The circumference is convex.

The second lens L2 has a positive refractive power, and the second lens L2 is cemented with the first lens L1. The object side S2 and the image side S3 of the second lens L2 are convex at the near optical axis; the object side S2 of the second lens L2 is concave near the circumference, and the image side S3 is convex near the circumference.

The third lens L3 has a positive refractive power, and the object side S4 and the image side S5 of the third lens L3 are convex at the near optical axis; the object side S4 of the third lens L3 is convex at the near circumference, and the image side S5 is at Near the circumference is concave.

The fourth lens L4 has a positive refractive power, and the object side S6 and the image side S7 of the fourth lens are convex at the near optical axis; the object side S6 and the image side S7 of the fourth lens L4 are both concave at the near circumference.

The fifth lens L5 has negative refractive power, and the object side S7 and the image side S8 of the fifth lens L5 are concave surfaces at the near optical axis; the object side S7 and the image side S8 of the fifth lens L5 are convex surfaces at the near circumference .

The sixth lens L6 has a negative refractive power, and the object side S9 and the image side S10 of the sixth lens are concave at the near optical axis; the object side S9 and the image side S10 of the sixth lens L6 are both concave near the circumference.

The seventh lens L7 has a negative refractive power, and the object side S11 and the image side S12 of the seventh lens L7 are concave surfaces at the near optical axis; the object side S11 of the seventh lens L7 is a convex surface near the circumference, and the image side S12 is at Near the circumference is concave.

The eighth lens L8 has a positive refractive power, the object side S13 of the eighth lens L8 is concave at the near optical axis, and the image side S14 is convex at the near optical axis; the object side S13 and the image side S14 of the eighth lens L8 are at Near the circumference are convex.

The other structures of the fifth embodiment are the same as those of the first embodiment, which can be referred to.

Table 5a(1)-Table 5a(2) are tables showing the characteristics of the optical system of the present embodiment, wherein the focal length, material refractive index and Abbe number are all obtained from visible light with a reference wavelength of 587.6 nm, Y radius, The units of thickness and effective focal length are both millimeters (mm).

Table 5a(1)

Table 5a(2)

variable distance	D1	D2	D3	EFL(mm)	FNO	FOV(°)	TTL(mm)
short focus position	9.8696	2.2813	5.1712	13.87	2.99	24.63	33.50
Mid focus position	6.3765	5.1016	4.5441	17.55	3.44	19.42	32.20
telephoto position	0.2054	13.4899	3.4080	31.01	5.00	11.09	33.28

Wherein, the meanings of the parameters in Table 5a(2) are the same as the meanings of the parameters in the first embodiment.

Table 5b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 5b

Fig. 5a shows a schematic structural diagram of the optical system of the fifth embodiment at the short focal end. FIG. 5b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment at the short focal end. It can be seen from FIG. 5b that the optical system provided in the fifth embodiment can achieve good imaging quality.

FIG. 5c shows a schematic structural diagram of the optical system of the fifth embodiment at the middle focal end. FIG. 5d shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment at the mid-focal end. It can be seen from FIG. 5d that the optical system provided in the fifth embodiment can achieve good imaging quality.

FIG. 5e shows a schematic structural diagram of the optical system of the fifth embodiment at the telephoto end. FIG. 5f shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the fifth embodiment at the telephoto end. It can be seen from FIG. 5f that the optical system provided in the fifth embodiment can achieve good imaging quality.

Sixth Embodiment

Referring to FIGS. 6a to 6f, the optical system of the present embodiment includes sequentially from the object side to the image side along the optical axis direction:

Right angle prism E, prism E has an incident surface A1, a reflection surface A2 and an exit surface A3. It can be understood that when the light from the subject enters the prism E vertically through the incident surface A1, it can be totally reflected by the reflective surface A2 and turned to the exit surface A3 to exit along the direction of the optical axis, and enter the lens part;

The first lens L1 and the first lens L1 have negative refractive power, and the object side S1 and the image side S2 of the first lens L1 are both concave surfaces at the near optical axis; the object side S1 and the image side S2 of the first lens L1 are near the optical axis. The circumference is convex.

The second lens L2 has a positive refractive power, and the second lens L2 is cemented with the first lens L1. The object side S2 and the image side S3 of the second lens L2 are convex at the near optical axis; the object side S2 of the second lens L2 is concave near the circumference, and the image side S3 is convex near the circumference.

The third lens L3 has a positive refractive power, and the object side S4 and the image side S5 of the third lens L3 are convex at the near optical axis; the object side S4 of the third lens L3 is convex at the near circumference, and the image side S5 is at Near the circumference is concave.

The fourth lens L4 has a positive refractive power, and the object side S6 and the image side S7 of the fourth lens are convex at the near optical axis; the object side S6 and the image side S7 of the fourth lens L4 are both concave at the near circumference.

The fifth lens L5 has negative refractive power, and the object side S7 and the image side S8 of the fifth lens L5 are concave surfaces at the near optical axis; the object side S7 and the image side S8 of the fifth lens L5 are convex surfaces at the near circumference .

The sixth lens L6 has negative refractive power, and the object side S9 and the image side S10 of the sixth lens are concave at the near optical axis; the object side S9 of the sixth lens L6 is convex near the circumference, and the image side S10 is near the circumference. The circumference is concave.

The seventh lens L7 has negative refractive power, the object side S11 of the seventh lens L7 is convex at the near optical axis, and the image side S12 is concave at the near optical axis; the object side S11 of the seventh lens L7 is near the circumference. Concave, like side S12 is convex near the circumference.

The eighth lens L8 has a positive refractive power, and the object side S13 and the image side S14 of the eighth lens L8 are convex surfaces at the near optical axis; the object side S13 of the eighth lens L8 is a convex surface near the circumference, and the image side S14 is at Near the circumference is concave.

The other structures of the sixth embodiment are the same as those of the first embodiment, which can be referred to.

Table 6a(1)-Table 6a(2) are tables showing the characteristics of the optical system of the present embodiment, wherein the focal length, material refractive index and Abbe number are all obtained from visible light with a reference wavelength of 587.6 nm, Y radius, The units of thickness and effective focal length are both millimeters (mm).

Table 6a(1)

Table 6a(2)

variable distance	D1	D2	D3	EFL(mm)	FNO	FOV(°)	TTL(mm)
short focus position	9.3622	1.1774	6.1297	14.51	3.11	23.59	33.50
Mid focus position	5.6181	5.2911	4.6349	19.18	3.70	17.78	32.37
telephoto position	0.0800	13.9728	2.6165	32.98	5.33	10.39	33.50

Wherein, the meanings of the parameters in Table 6a(2) are the same as the meanings of the parameters in the first embodiment.

Table 6b shows the coefficients of higher-order terms that can be used for each aspherical mirror surface in the sixth embodiment, wherein each aspherical surface type can be defined by the formula given in the first embodiment.

Table 6b

FIG. 6a shows a schematic structural diagram of the optical system of the sixth embodiment at the short focal end. Fig. 6b shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment at the short focal end. It can be seen from FIG. 6b that the optical system provided in the sixth embodiment can achieve good imaging quality.

FIG. 6c shows a schematic structural diagram of the optical system of the sixth embodiment at the middle focal end. FIG. 6d shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment at the mid-focal end. It can be seen from FIG. 6d that the optical system provided in the sixth embodiment can achieve good imaging quality.

FIG. 6e shows a schematic structural diagram of the optical system of the sixth embodiment at the telephoto end. FIG. 6f shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical system of the sixth embodiment at the telephoto end. It can be seen from FIG. 6f that the optical system provided in the sixth embodiment can achieve good imaging quality.

Table 7 shows Fc/Fd, FOVc/ImgH, D2c/D2d, et12/ct12, fg3/g3, Fc/(f3+fjh2), |R71|/ in the optical systems of the first to sixth embodiments The value of R82, f8/ct8.

Table 8

	Fc/Fd	FOVc/ImgH	D2c/D2d	et12/ct12
first embodiment	2.29	3.85	9.78	4.21
Second Embodiment	2.22	3.81	6.98	3.95
Third Embodiment	2.40	3.82	13.59	7.11
Fourth Embodiment	2.20	3.75	13.49	4.88
Fifth Embodiment	2.24	3.70	5.91	2.84
Sixth Embodiment	2.27	3.46	11.87	4.90
	fg3/g3	Fc/(f3+fjh2)	|R71|/R82	f8/ct8
first embodiment	4.21	1.09	1.52	8.14
Second Embodiment	5.87	1.09	2.01	48.87
Third Embodiment	4.09	1.10	1.76	7.51
Fourth Embodiment	6.64	1.15	5.05	24.43
Fifth Embodiment	5.10	1.16	1.86	5.19
Sixth Embodiment	7.01	1.25	1.34	11.61

It can be seen from Table 7 that the optical systems of the first to sixth embodiments all satisfy the following conditional formulas: Fc/Fd≥2.2, FOVc/ImgH<3.9, 5.5<D2c/D2d<14, 2.5<et12/ct12<7.5 , 4<fg3/g3<7.5, 1<Fc/(f3+fjh2)<1.3, 1.2<|R71|/R82<5.2, 5<f8/ct8<50.

What is disclosed above is only a preferred embodiment of the present application, and of course, it cannot limit the scope of the right of the present application. Those of ordinary skill in the art can understand all or part of the process of implementing the above-mentioned embodiment, and the rights of the present application are not limited by this. The equivalent changes required to be made still fall within the scope covered by this application.

Claims (12)

1. An optical system, characterized in that, along the optical axis from the object side to the image side, it comprises:

   Right-angle prism, the right-angle prism includes a light incident surface, a reflection surface and a light exit surface, the light entrance surface and the light exit surface are connected vertically, the reflection surface is connected with the light entrance surface and the light exit surface, and the light enters vertically the light incident surface is totally reflected by the reflective surface and then exits from the light emitting surface;

   a first lens group, opposite to the light emitting surface and having negative refractive power, including a first lens and a second lens arranged in sequence along the optical axis;

   The second lens group, with positive refractive power, includes a third lens, a fourth lens and a fifth lens arranged in sequence along the optical axis;

   The third lens group has a positive refractive power and includes a sixth lens, a seventh lens and an eighth lens arranged in sequence along the optical axis;

   The first to eighth lenses include at least one aspherical plastic lens.
2. The optical system according to claim 1, wherein the optical system is a zoom optical system, and the zoom optical system is provided with a telephoto end and a short focal end.
3. The optical system according to claim 2, wherein the optical system satisfies the conditional expression:

   Fc/Fd≥2.2;

   Wherein, Fc is the effective focal length of the optical system at the long focal end, and Fd is the effective focal length of the optical system at the short focal end.
4. The optical system according to claim 2, wherein the optical system satisfies the conditional expression:

   FOVc/ImgH<3.9;

   Wherein, FOVc is the maximum angle of view of the optical system at the telephoto end, and ImgH is half of the diagonal length of the effective photosensitive area on the imaging plane.
5. The optical system according to claim 2, wherein the optical system satisfies the conditional expression:

   5.5<D2c/D2d<14;

   Wherein, D2c is the distance between the image side of the fifth lens and the object side of the sixth lens on the optical axis when the optical system is at the telephoto end; D2d is the optical system at the short focus The distance between the image side surface of the fifth lens and the image side surface of the sixth lens on the optical axis at the end.
6. The optical system of claim 1, wherein the optical system satisfies the conditional expression:

   2.5<et12/ct12<7.5;

   Wherein, et12 is the horizontal distance from the image side of the second lens to the object side of the third lens at the effective diameter, and ct12 is the distance between the image side of the second lens and the object side of the third lens in the light distance on the axis.
7. The optical system of claim 1, wherein the optical system satisfies the conditional expression:

   4<fg3/g3<7.5;

   Wherein, fg3 is the effective focal length of the third lens group, and g3 is the distance on the optical axis from the object side of the sixth lens to the image side of the eighth lens.
8. The optical system according to claim 2, wherein the optical system satisfies the conditional expression:

   1<Fc/(f3+fjh2)<1.3;

   Wherein, Fc is the effective focal length of the optical system at the telephoto end, f3 is the effective focal length of the third lens; fjh2 is the combined effective focal length of the fourth lens and the fifth lens, and the fourth lens The lens and the fifth lens are cemented to form a cemented lens.
9. The optical system of claim 1, wherein the optical system satisfies the conditional expression:

   1.2<|R71|/R82<5.2;

   Wherein, R71 is the radius of curvature of the object side of the seventh lens on the optical axis, and R82 is the radius of curvature of the image side of the eighth lens on the optical axis.
10. The optical system of claim 1, wherein the optical system satisfies the conditional expression:

    5<f8/ct8<50;

    Wherein, f8 is the effective focal length of the eighth lens, and ct8 is the thickness of the eighth lens on the optical axis.
11. A camera module, characterized by comprising a lens barrel, an electronic photosensitive element and the optical system according to any one of claims 1 to 10, wherein the first lens to the eighth lens of the optical system are all Installed in the lens barrel, the electronic photosensitive element is arranged on the image side of the optical system.
12. An electronic device, comprising a casing and a camera module according to claim 11, wherein the camera module is arranged in the casing.

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