Optical system, camera module and electronic equipment

Abstract

The invention discloses an optical system, a camera module and electronic equipment. The optical system comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged, the first lens to the third lens form a first lens group, the fourth lens to the sixth lens form a second lens group, the first lens group is fixed relative to an imaging surface of the optical system, and the second lens group moves between the first lens group and the imaging surface of the optical system in the optical axis direction; the optical system meets the relational expression that FOV is larger than 5 deg and smaller than 20 deg, and FNO is larger than 1.7 and smaller than 3. According to the optical system, the camera module and the electronic equipment disclosed by the invention, the influence on the focusing speed can be reduced on the basis of considering the miniaturization design.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, and in particular to an optical system, a camera module and an electronic device. BACKGROUND

[0002] With the miniaturization requirement of smart terminals such as mobile phones and tablet computers being higher and higher, the design requirement of the optical system arranged in the mobile phone and the tablet computer also brings new challenges. In the related technology, the focusing mode of the optical system is generally realized by moving the entire lens through the focusing motor to make the imaging surface coincide with the photosensitive surface of the photosensitive chip, so a larger space (mechanical back focus) needs to be reserved between the lens and the photosensitive chip. Thus, not only is the miniaturization design of the lens module not conducive, but also the moving of the entire lens requires a higher power of the focusing motor, resulting in a larger size of the focusing motor and a significant decrease in the focusing speed. SUMMARY

[0003] Embodiments of the present application disclose an optical system, a camera module and an electronic device, which can reduce the influence on the focusing speed while taking into account the miniaturization design.

[0004] To achieve the above-mentioned purpose, in a first aspect, the present application discloses an optical system, comprising, in order from the object side to the image side along the optical axis:

[0005] a first lens group, the first lens group comprising, in order from the object side to the image side along the optical axis, a first lens, a second lens and a third lens, the first lens having positive refractive power, the object side surface of the first lens being convex at the near optical axis, the second lens having negative refractive power, the object side surface of the second lens being convex at the near optical axis, the image side surface of the second lens being concave at the near optical axis, the third lens having positive refractive power, the object side surface and the image side surface of the third lens being convex at the near optical axis; and

[0006] a second lens group, the second lens group comprising, in order from the object side to the image side along the optical axis, a fourth lens, a fifth lens and a sixth lens, the fourth lens having negative refractive power, the image side surface of the fourth lens being concave at the near optical axis, the fifth lens having positive refractive power, the object side surface of the fifth lens being convex at the near optical axis, the image side surface of the fifth lens being concave at the near optical axis, the sixth lens having negative refractive power, the object side surface of the sixth lens being concave at the near optical axis;

[0007] wherein the first lens group is fixed relative to the imaging surface of the optical system, and the second lens group is movable along the optical axis direction between the first lens group and the imaging surface of the optical system;

[0008] The optical system satisfies the following relationship: 5deg < FOV < 20deg, and 1.5 < FNO < 3.2;

[0009] FOV is the maximum field of view angle of the optical system, and FNO is the F-number of the optical system.

[0010] In a second aspect, the present application discloses a camera module, which comprises an image sensor and the optical system as described in the first aspect above, and the image sensor is arranged on the image side of the optical system. The camera module with the optical system described above can reduce the influence on the focusing speed on the basis of considering the miniaturized design.

[0011] In a third aspect, the present application discloses an electronic device, which comprises a housing and the camera module as described in the second aspect above, and the camera module is arranged on the housing. The electronic device with the camera module described above can reduce the influence on the focusing speed on the basis of considering the miniaturized design.

[0012] Compared with the prior art, the present application has the beneficial effects that:

[0013] In the optical system provided in the application, in order to reduce the influence on focusing speed on the basis of realizing miniaturization design, six lenses are divided into a first lens group and a second lens group, the first lens group is fixed relative to the imaging surface of the optical system, and the second lens group can move along the optical axis direction between the first lens group and the imaging surface of the optical system, so that the optical system can have a continuous internal focusing function, and at the same time, only by moving the second lens group, the burden of the motor of the optical system can be further reduced, and the effect of fast internal focusing of the optical system can be achieved by using a motor with lower power. In addition, by using six lenses with refractive power, the pressure of light refraction can be evenly distributed to each lens, so as to reduce the task of single lens refraction, and avoid that the lens is too curved to increase the tolerance sensitivity. Specifically, the first lens has positive refractive power, and the object side surface thereof is designed as a convex surface near the optical axis, which can help the light to enter the first lens better. The second lens has negative refractive power, and the object side surface and the image side surface of the second lens are respectively designed as a convex surface and a concave surface near the optical axis, which can help to correct the aberration generated by the first lens and improve the imaging effect of the optical system. The third lens has positive refractive power, and the object side surface and the image side surface thereof are both designed as convex surfaces near the optical axis, which can help to reduce the light incidence angle of the light entering the optical system, so that as much light as possible enters the optical system. The fourth lens has negative refractive power, and the image side surface thereof is designed as a concave surface near the optical axis, which can help to correct the spherical aberration, coma and distortion generated by the first lens group, and further improve the imaging quality of the optical system. The fifth lens has positive refractive power, and the object side surface and the image side surface thereof are respectively designed as a convex surface and a concave surface near the optical axis, which can help to correct the distortion and astigmatism. The sixth lens has negative refractive power, and the object side surface thereof is designed as a concave surface near the optical axis, which can help to correct the chromatic aberration, so as to improve the imaging quality of the optical system.

[0014] In addition, the optical system satisfies the relationship: 5deg < FOV < 20deg, and 1.5 < FNO < 3.2, which can realize large aperture imaging. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1A is a structural schematic diagram of the optical system disclosed in the first embodiment of the application in a telephoto state;

[0017] Figure 1Bis a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system disclosed by the first embodiment of the present application in a far focus state;

[0018] Figure 2A is a structural schematic diagram of the optical system disclosed by the first embodiment of the present application in a near focus state;

[0019] Figure 2B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system disclosed by the first embodiment of the present application in a near focus state;

[0020] Figure 3A is a structural schematic diagram of the optical system disclosed by the second embodiment of the present application in a far focus state;

[0021] Figure 3B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system disclosed by the second embodiment of the present application in a far focus state;

[0022] Figure 4A is a structural schematic diagram of the optical system disclosed by the second embodiment of the present application in a near focus state;

[0023] Figure 4B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system disclosed by the second embodiment of the present application in a near focus state;

[0024] Figure 5A is a structural schematic diagram of the optical system disclosed by the third embodiment of the present application in a far focus state;

[0025] Figure 5B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system disclosed by the third embodiment of the present application in a far focus state;

[0026] Figure 6A is a structural schematic diagram of the optical system disclosed by the third embodiment of the present application in a near focus state;

[0027] Figure 6B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system disclosed by the third embodiment of the present application in a near focus state;

[0028] Figure 7A is a structural schematic diagram of the optical system disclosed by the fourth embodiment of the present application in a far focus state;

[0029] Figure 7Bis a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system in the far focus state disclosed by the fourth embodiment of the present application;

[0030] Figure 8A is a structural schematic diagram of the optical system in the near focus state disclosed by the fourth embodiment of the present application;

[0031] Figure 8B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system in the near focus state disclosed by the fourth embodiment of the present application;

[0032] Figure 9A is a structural schematic diagram of the optical system in the far focus state disclosed by the fifth embodiment of the present application;

[0033] Figure 9B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system in the far focus state disclosed by the fifth embodiment of the present application;

[0034] Figure 10A is a structural schematic diagram of the optical system in the near focus state disclosed by the fifth embodiment of the present application;

[0035] Figure 10B is a longitudinal spherical aberration graph (mm), a coma curve graph (mm) and a distortion curve graph (%) of the optical system in the near focus state disclosed by the fifth embodiment of the present application;

[0036] Figure 11 is a structural schematic diagram of the camera module disclosed by the present application;

[0037] Figure 12 is a structural schematic diagram of the electronic device disclosed by the present application. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0039] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0040] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0041] Please refer to the following: Figure 1A as well as Figure 2A According to a first aspect of this application, an optical system 100 is disclosed. The optical system 100 includes a first lens group G1 and a second lens group G2 arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 includes a first lens L1, a second lens L2, and a third lens L3 arranged sequentially along the optical axis from the object side to the image side. The second lens group G2 includes a fourth lens L4, a fifth lens L5, and a sixth lens L6 arranged sequentially along the optical axis from the object side to the image side. The first lens group G1 is fixed relative to the imaging plane IMG of the optical system 100. The second lens group G2 moves along the optical axis between the first lens group G1 and the imaging plane IMG of the optical system 100, thereby enabling the optical system 100 to have continuous internal focusing functionality. Furthermore, by using only the second lens group G2 for movement, the load on the motor of the optical system 100 can be further reduced, achieving rapid internal focusing of the optical system 100 with a lower-power motor.

[0042] In this system, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 sequentially from the object side of the first lens L1, and finally form an image on the imaging plane IMG of the optical system 100.

[0043] Furthermore, the object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 of the first lens L1 can be either concave or convex near the optical axis. The object-side surface S3 of the second lens L2 is convex near the optical axis, and the image-side surface S4 of the second lens L2 is concave near the optical axis; the object-side surface S5 and the image-side surface S6 of the third lens L3 are both convex near the optical axis; the object-side surface S7 of the fourth lens L4 is either concave or convex near the optical axis, and the image-side surface S8 of the fourth lens L4 is concave near the optical axis; the object-side surface S9 of the fifth lens L5 is either convex or concave near the optical axis, and the image-side surface S10 of the fifth lens L5 is concave near the optical axis; the object-side surface S11 of the sixth lens L6 is concave near the optical axis, and the image-side surface S12 of the sixth lens L6 is either concave or convex near the optical axis.

[0044] By designing the refractive power and surface shape of the six lenses, specifically, the first lens L1 has positive refractive power, and the object side surface thereof is convex near the optical axis, which is beneficial to the incidence and collection of light in the field of view; the second lens L2 has negative refractive power, and the object side surface S3 and the image side surface of the second lens L2 are convex and concave near the optical axis, respectively, which is helpful to correct the aberration generated by the first lens L1; the third lens L3 has positive refractive power, and the object side surface and the image side surface thereof are both convex near the optical axis, which is beneficial to reduce the light incident into the optical system 100 from the front lens, thereby reducing the incidence angle of the light; the fourth lens L4 has negative refractive power, and the image object side surface thereof is concave near the optical axis, which is beneficial to correct the spherical aberration, coma and distortion generated by the first lens group; the fifth lens L5 has positive refractive power, and the object side surface and the image side surface thereof are convex and concave near the optical axis, respectively, which is beneficial to correct the distortion and astigmatism; the sixth lens L6 has negative refractive power, and the object side surface thereof is concave near the optical axis, which can effectively correct the aberration and also control the exit angle of the light. In addition, among the six lenses of the optical system 100, multiple lenses adopt the design of concave-convex lenses, which can effectively reduce the total length of the optical system 100 and is beneficial to the miniaturization design of the optical system 100. It can be understood that the application only provides a preferred scheme for the refractive power and surface shape design of the lenses of the optical system 100, and in other embodiments, the surface shape design of the optical system 100 can also adopt other schemes, which are not all listed here due to the length of the article, and other arbitrary combinations are also feasible.

[0045] In some embodiments, the optical system 100 can be applied to electronic devices such as smart phones and smart tablets, and therefore the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be plastic, so as to realize the lightweight of the optical system 100 and facilitate the processing of complex lens surface shape. It can be understood that in other embodiments, when the optical system 100 is applied to electronic devices such as vehicle-mounted devices and driving recorders, or is applied to a car and used as a camera on the car body, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can also be glass lenses, so as to have good optical effect and also reduce the temperature sensitivity of the optical system 100.

[0046] In some embodiments, the optical system 100 can further include a prism P1, which can be arranged on the object side of the first lens L1, so that the optical system 100 can be formed into a periscopic optical system.

[0047] In some embodiments, the optical system 100 further comprises a stop STO, which can be an aperture stop and / or a field stop, and which can be arranged between the prism P1 and the object side S1 of the first lens L1. It can be understood that in other embodiments, the stop STO can also be arranged between other two lenses, for example, the stop STO can also be arranged between the fourth lens L4 and the fifth lens L5, and the arrangement can be adjusted according to actual conditions, and the embodiments are not limited specifically.

[0048] In some embodiments, the optical system 100 further comprises a filter IR, which is arranged in the second lens group G2 and between the sixth lens L6 and the imaging surface IMG of the optical system 100. The filter IR can be moved along the optical axis direction between the sixth lens L6 and the imaging surface IMG of the optical system 100 under the driving of the second lens group G2. Therefore, the filter IR can move with the second lens group G2. When the optical system 100 is applied to a camera module, compared with the scheme in the related art in which the filter IR is arranged on the image sensor, the packaging of the image sensor can be effectively simplified, and the thin design of the image sensor is also beneficial. Optionally, the filter IR can be an infrared cut-off filter. The infrared cut-off filter can filter out infrared light, improve the imaging quality, and make the imaging more consistent with the visual experience of the human eye. It can be understood that the filter IR can be made of optical glass coating, colored glass, or other materials, and can be selected according to actual needs, and the embodiments are not limited specifically.

[0049] In some embodiments, the optical system 100 satisfies the following relationship: 5 deg < FOV < 20 deg, where FOV is the maximum field of view of the optical system 100. When the optical system 100 satisfies the relationship 5 deg < FOV < 20 deg, the optical system 100 can achieve the functions of small field of view and telephoto. Optionally, the relationship can further satisfy 10 deg < FOV < 16 deg. Therefore, the functions of small field of view and telephoto of the optical system 100 are more prominent.

[0050] In some embodiments, the optical system 100 satisfies the relationship: 1.5 < FNO < 3.2. In this way, the optical system 100 can have the characteristic of large aperture. Optionally, the relationship can further satisfy 1.7 < FNO < 3. In this way, the large aperture characteristic of the optical system 100 is more prominent.

[0051] In some embodiments, the optical system 100 satisfies a relationship: 1.1 < FNOz1 / FNOz2 < 1.7, where FNOz1 is the F-number of the optical system 100 in the close focus state, and FNOz2 is the F-number of the optical system 100 in the far focus state. When the optical system 100 satisfies the relationship, the F-number of the optical system 100 is close in the close focus state and the far focus state, so that the optical system 100 can maintain the large aperture characteristic in the far focus state and the close focus state. Optionally, the relationship can further satisfy 1.2 < FNOz1 / FNOz2 < 1.5, so as to facilitate the realization of the large aperture characteristic of the optical system 100 in different states.

[0052] In some embodiments, the optical system 100 further satisfies a relationship: 2.0 < Bz2 / Bz1, where Bz1 is the distance on the optical axis from the image side surface S6 of the third lens L3 to the object side surface S7 of the fourth lens L4 when the optical system 100 is in the close focus state, and Bz2 is the distance on the optical axis from the image side surface S6 of the third lens L3 to the object side surface S7 of the fourth lens L4 when the optical system 100 is in the far focus state. Through the movement of the second lens group G2, the internal focusing imaging can be realized while correcting the image quality performance of different object distances, and when the optical system 100 satisfies the relationship 2.5 < Bz2 / Bz1, the movement amount of the second lens group G2 from the far focus to the close focus can be effectively controlled, so as to reduce the movement stroke of the second lens group G2, effectively ensure the movement amount of the motor, and reduce the influence on the focusing speed. Optionally, the relationship can further satisfy 3 < Bz2 / Bz1 < 13, so that the movement stroke of the second lens group G2 is reasonable, and the influence on the focusing speed can be further reduced.

[0053] In some embodiments, the optical system 100 further satisfies a relationship: 1.35 < fz1 / fz2 < 2, where fz1 is the focal length of the optical system 100 in the close focus state, and fz2 is the focal length of the optical system 100 in the far focus state. When the optical system 100 satisfies the relationship, the refractive power of the optical system 100 in the close focus state and the far focus state can be reasonably distributed, so that the refractive power of the optical system 100 is reasonable. Optionally, the optical system 100 can further satisfy 1.4 < fz1 / fz2 < 1.7, so that the refractive power distribution is more appropriate.

[0054] In some embodiments, the optical system 100 satisfies the following relationship: 0.7 < DLmax / TTL < 1. Wherein DLmax is the maximum distance on the optical axis between the object side S1 of the first lens L1 and the image side S12 of the sixth lens L6, and TTL is the distance on the optical axis from the object side S1 of the first lens L1 to the imaging surface IMG of the optical system 100 (i.e. the total length of the optical system 100). When the optical system 100 satisfies the relationship 0.7 < DLmax / TTL < 1, the space of the lens part of the optical system 100 can be reduced on the basis of realizing the miniaturization design of the optical system 100, and sufficient space is left for the second lens group G2 to focus under different working object distance conditions (i.e. far focus and near focus), so that the optical system 100 can be realized under the condition of realizing internal focusing, saving cost and realizing compact arrangement. Alternatively, the relationship can be further 0.8 < DLmax / TTL < 1, so as to further leave sufficient space for the second lens group to focus under different working object distance conditions, and further facilitate the flexible layout of the first lens group and the second lens group of the optical system 100.

[0055] In some embodiments, the optical system 100 satisfies the following relationship: 0.8 < TTL / fmax < 1.3. Wherein fmax is the maximum focal length of the optical system 100. In this way, the optical system 100 can provide a lower lens height in the FOV < 20 deg range, further realizing miniaturization design while also realizing better telephoto effect. Alternatively, the relationship can be further 0.95 < TTL / fmax < 1.2, and the telephoto effect is better.

[0056] In some embodiments, the optical system 100 satisfies the relationship: 3.3 < TTL / ImgH < 6. Wherein ImgH is half of the image height corresponding to the maximum field of view angle of the optical system 100. By limiting the ratio of the total length of the optical system 100 and half of the image height corresponding to the maximum field of view angle of the optical system 100, the optical system 100 can have good imaging effect while realizing miniaturization design. In addition, the optical system 100 can also be close to long focal characteristics and have sufficient structural layout space. Alternatively, the relationship can be further 3.8 < TTL / ImgH < 5.5, so that the optical system 100 is closer to long focal characteristics and facilitates structural layout.

[0057] In some embodiments, the optical system 100 satisfies the following relationship: 0.8 < TD123 / TD456 < 1.5, where TD123 is the distance on the optical axis from the object side S1 of the first lens L1 to the image side S6 of the third lens L3, and TD456 is the distance on the optical axis from the object side S7 of the fourth lens L4 to the image side S12 of the sixth lens L6. When the optical system 100 satisfies the relationship, the overall thickness of the first lens group and the second lens group can be effectively controlled, thereby facilitating the control of the total length of the optical system 100, and thereby facilitating the miniaturization design of the optical system 100. Optionally, the relationship can further satisfy 0.95 < TD123 / TD456 < 1.3, thereby further facilitating the miniaturization design of the optical system 100.

[0058] In some embodiments, the optical system 100 satisfies the following relationship: 1.1 < TTL / (TD123+TD456) < 1.7. In this way, when the optical system 100 switches between the near focus state and the far focus state, the total length of the optical system 100 can be switched within a range, and the difference in the total length of the optical system 100 is not large, thereby effectively controlling the movement distance of the second lens group, and realizing internal focusing. Optionally, the relationship can further satisfy 1.3 < TTL / (TD123+TD456) < 1.5, thereby further controlling the movement distance of the second lens group G2.

[0059] In some embodiments, the optical system 100 satisfies the following relationship: 0.55 < SD11 / ImgH < 1.1, where SD11 is the maximum effective half aperture of the object side S1 of the first lens L1. When the optical system 100 satisfies the relationship, the ratio of the head aperture of the optical system 100 and the imaging surface IMG can be reasonably controlled, the light rays in the field of view range can be converged, and at the same time, the maximum effective half aperture of the object side of the first lens L1 and the size of the imaging surface of the optical system 100 can be matched, thereby facilitating the improvement of the space utilization of the optical system 100. Optionally, the relationship can further satisfy 0.65 < SD11 / ImgH < 0.9, thereby making the aperture of the object side of the first lens L1 and the size of the imaging surface IMG closer, and thereby more facilitating the improvement of the space utilization of the optical system 100.

[0060] In some embodiments, the optical system 100 satisfies the following relationship: 0.7 < SD62 / ImgH < 1.2. Wherein, SD62 is the maximum effective half aperture of the image side S12 of the sixth lens L6. When the optical system 100 satisfies the relationship, the ratio of the maximum effective half aperture of the sixth lens L6 to the imaging surface IMG of the optical system 100 can be reasonable, so that the light passing through the sixth lens L6 can smoothly enter the imaging surface IMG, which is beneficial to improve the imaging effect of the optical system 100, and in addition, the maximum effective half aperture of the image side S12 of the sixth lens L6 and the size of the imaging surface of the optical system 100 can be matched, which is more conducive to the entry of light. Optionally, the relationship can further satisfy: 0.8 < SD62 / ImgH < 1, so that the maximum effective half aperture of the image side S12 of the sixth lens L6 and the size of the imaging surface of the optical system 100 are more adaptive.

[0061] In some embodiments, the optical system 100 satisfies the following relationship: 0.8 < SD32 / SD41 < 1.2. Wherein, SD32 is the maximum effective half aperture of the image side of the third lens L3, and SD41 is the maximum effective half aperture of the object side S7 of the fourth lens L4. When the optical system 100 satisfies the relationship 1.2 < SD32 / SD41 < 1.5, that is, the maximum effective half aperture of the image side S6 of the third lens L3 is greater than the maximum effective half aperture of the object side S7 of the fourth lens L4, on the one hand, the difference between the maximum effective half apertures of the image side S6 of the third lens L3 and the object side S7 of the fourth lens L4 can be not large, so that the step formed between them can be controlled, and the transition of light between the third lens L3 and the fourth lens L4 is more gentle. On the other hand, it is also beneficial to reduce the movement stroke of the second lens group, while reducing the spherical aberration and coma introduced by the first lens group, which is beneficial to improve the imaging quality of the optical system 100. Optionally, the relationship can further satisfy 0.9 < SD32 / SD41 < 1.1, so that the step between the third lens L3 and the fourth lens L4 is smaller, and the transition between them is more gentle.

[0062] In some embodiments, the optical system 100 satisfies the following relationship: 0.7 < SD11 / CT1 < 1.5, where SD11 is the maximum effective half aperture of the object side S1 of the first lens L1, and CT1 is the thickness of the first lens L1 on the optical axis. By limiting the ratio of the maximum effective half aperture of the object side S1 of the first lens L1 to the central thickness of the first lens L1, the face shape of the first lens L1 can be effectively controlled, while the central thickness of the first lens L1 is reasonable, which is conducive to the incidence and convergence of light in the field of view range, and also conducive to the processing and forming of the first lens L1, so that the thickness design of the first lens L1 is reasonable, and the processing difficulty of the first lens L1 is reduced. Optionally, the relationship can further satisfy 0.9 < SD11 / CT1 < 1.3, which is more conducive to the processing and forming of the first lens L1.

[0063] In some embodiments, the optical system 100 satisfies the following relationship: 0.4 < CT123 / ∑CT < 0.7, where CT123 is the sum of the thicknesses of the first lens L1, the second lens L2, and the third lens L3 on the optical axis (i.e., the overall thickness of the first lens group), and ∑CT is the sum of the thicknesses of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 on the optical axis. By limiting the ratio of the overall thickness of the first lens group to the overall thickness of the first lens group and the second lens group, the overall thickness of the first lens group can be reasonably controlled, so that the overall thickness of the first lens group and the second lens group is not too different, thereby facilitating the processing and assembly of the first lens group and the second lens group while achieving miniaturization of the optical system 100. Optionally, the relationship can further satisfy 0.45 < CT123 / ∑CT < 0.65, which can better control the overall thickness of the first lens group G1 and is conducive to the miniaturization design of the optical system 100.

[0064] In some embodiments, the optical system 100 satisfies the following relationship: 0.3 < CT456 / ∑CT < 0.6, where CT456 is the sum of the thicknesses of the fourth lens L4, the fifth lens L5, and the sixth lens L6 on the optical axis (i.e., the overall thickness of the second lens group). In this way, the overall thickness of the second lens group is controlled to be about half of the sum of the overall thicknesses of the first lens group and the second lens group, thereby reasonably controlling the overall thickness of the second lens group, so that the overall thicknesses of the first lens group and the second lens group are not too different, thereby facilitating the processing and assembly of the first lens group and the second lens group while achieving miniaturization of the optical system 100. Optionally, the relationship can further satisfy 0.37 < CT456 / ∑CT < 0.53, which can better control the overall thickness of the second lens group and is conducive to the miniaturization design of the optical system 100.

[0065] In some embodiments, the optical system 100 satisfies the following relationship: 1.4 < CT1 / CT2 < 3.5. Wherein CT2 is the thickness of the second lens L2 on the optical axis. By limiting the ratio of the thickness of the first lens L1 on the optical axis to the thickness of the second lens L2 on the optical axis, the thicknesses of the first lens L1 and the second lens L2 can be reasonably controlled, the miniaturization design of the optical system 100 is realized, and the sensitivity of the optical system 100 is reduced. Alternatively, the relationship can further satisfy 0.7 < CT1 / CT2 < 3, so that the first lens thickness is larger, and the sensitivity of the optical system 100 is lower.

[0066] In some embodiments, the optical system 100 satisfies the following relationship: 0.7 < CT3 / CT2 < 3. Wherein CT3 is the thickness of the third lens L3 on the optical axis. When the relationship is satisfied, the thicknesses of the third lens L3 and the second lens L2 can be effectively controlled, the miniaturization design of the optical system 100 is realized, and the sensitivity of the optical system 100 is reduced. Alternatively, the relationship can further satisfy 0.9 < CT3 / CT2 < 2.5, so that the thickness difference between the two is not too large, and the sensitivity of the optical system 100 is further reduced.

[0067] In some embodiments, the optical system 100 satisfies the following relationship: 2 < CT5 / CT4 < 5. Wherein CT4 is the thickness of the fourth lens L4 on the optical axis, and CT5 is the thickness of the fifth lens L5 on the optical axis. When the relationship is satisfied, the thicknesses of the fifth lens L5 and the fourth lens L4 can be effectively controlled, the miniaturization design of the optical system 100 is realized, and the sensitivity of the optical system 100 is reduced. Alternatively, the relationship can further satisfy 2.4 < CT5 / CT4 < 4, so that the thickness of the fifth lens L5 is larger, and the sensitivity of the optical system 100 is lower.

[0068] In some embodiments, the optical system 100 satisfies the following relationship: 0.5 < CT4 / CT6 < 1.1. Wherein CT6 is the thickness of the sixth lens L6 on the optical axis. When the relationship is satisfied, the thicknesses of the fourth lens L4 and the sixth lens L6 can be effectively controlled, the miniaturization design of the optical system 100 is realized, and the sensitivity of the optical system 100 is reduced. Alternatively, the relationship can further satisfy 0.6 < CT4 / CT6 < 0.9, so that the thickness of the fourth lens L4 and the thickness of the sixth lens L6 are not too different, and the sensitivity of the optical system 100 is reduced.

[0069] In some embodiments, the optical system 100 satisfies the following relationship: 1.2 < CT5 / CT6 < 4. When the relationship is satisfied, the thickness of the fifth lens L5 and the sixth lens L6 can be effectively controlled, the miniaturization design of the optical system 100 can be achieved, and the sensitivity of the optical system 100 can be reduced. Alternatively, the relationship can further satisfy 1.6 < CT5 / CT6 < 3.3, so that the thickness of the fifth lens L5 is greater, and the sensitivity of the optical system 100 is lower.

[0070] In some embodiments, the optical system 100 satisfies the following relationship: 0.15 < CT5 / ∑CT < 0.35. When the relationship is satisfied, the thickness of the fifth lens L5 can be effectively distributed, the miniaturization design of the optical system 100 can be achieved, and the sensitivity of the optical system 100 can be reduced. Alternatively, the relationship can further satisfy 0.2 < CT5 / ∑CT < 0.3, so that the thickness ratio of the fifth lens L5 can be further controlled, and the sensitivity of the optical system 100 can be reduced.

[0071] In some embodiments, the optical system 100 satisfies the following relationship: 0.4 < f1 / fmax < 1.5, where f1 is the focal length of the first lens L1, and fmax is the maximum focal length of the optical system 100. By controlling the ratio of the focal length of the first lens L1 to the maximum focal length of the optical system 100, the first lens L1 can have a reasonable refractive power distribution, which helps to reduce the comprehensive spherical aberration, chromatic aberration, and distortion of the first lens group to a reasonable position, reduces the design difficulty of the rear lens, improves the overall resolving power of the optical system 100, and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the first lens group, thereby helping to form a small size optical system 100. Alternatively, the relationship further satisfies 0.5 < f1 / fmax < 1.3. Thus, the size of the first lens group G1 can be further compressed, and the miniaturization design of the optical system 100 can be achieved.

[0072] In some embodiments, the optical system 100 satisfies the following relationship: -0.9 < f2 / fmax < -0.3, where f2 is the focal length of the second lens L2. By controlling the ratio of the focal length of the second lens L2 to the maximum focal length of the optical system 100, the second lens L2 can have a reasonable refractive power, which helps to reduce the comprehensive spherical aberration, chromatic aberration, and distortion of the first lens group to a reasonable position, reduces the design difficulty of the rear lens, improves the overall resolving power of the optical system 100, and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the first lens group, thereby helping to form a small size optical system 100. Alternatively, the relationship further satisfies -0.7 < f2 / fmax < -0.4, so that the size of the first lens group G1 can be further compressed, and the miniaturization design of the optical system 100 can be achieved.

[0073] In some embodiments, the optical system 100 satisfies the following relationship: 0.25 < f3 / fmax < 0.6, where f3 is the focal length of the third lens L3. By controlling the ratio of the focal length of the third lens L3 to the maximum focal length of the optical system 100, the third lens L3 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration and distortion of the first lens group to a reasonable level, reduces the design difficulty of the subsequent lenses, improves the overall resolving power of the optical system 100, and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the first lens group, thereby helping to form a small size optical system 100. Optionally, the relationship further satisfies 0.3 < f3 / fmax < 0.45, which can achieve the miniaturization design of the optical system 100 while improving the imaging quality of the optical system 100.

[0074] In some embodiments, the optical system 100 satisfies the following relationship: -1.2 < f4 / fmax < -0.25, where f4 is the focal length of the fourth lens L4. By controlling the ratio of the focal length of the fourth lens L4 to the maximum focal length of the optical system 100, the fourth lens L4 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration and distortion of the second lens group to a reasonable level, reduces the design difficulty of the subsequent lenses, improves the overall resolving power of the optical system 100, and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the second lens group, thereby helping to form a small size optical system 100. Optionally, the relationship further satisfies -1 < f4 / fmax < -0.3, which can achieve the miniaturization design of the optical system 100 while improving the imaging quality of the optical system 100.

[0075] In some embodiments, the optical system 100 satisfies the following relationship: 0.5 < f5 / fmax < 3.2, where f5 is the focal length of the fifth lens L5. By controlling the ratio of the focal length of the fifth lens L5 to the maximum focal length of the optical system 100, the fifth lens L5 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration and distortion of the second lens group to a reasonable level, reduces the design difficulty of the subsequent lenses, improves the overall resolving power of the optical system 100, and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the second lens group, thereby helping to form a small size optical system 100. Optionally, the relationship further satisfies 0.5 < f5 / fmax < 3.2, which can achieve the miniaturization design of the optical system 100 while improving the imaging quality of the optical system 100.

[0076] In some embodiments, the optical system 100 satisfies the following relationship: -3 < f6 / fmax < -0.9, where f6 is the focal length of the sixth lens L6. By controlling the ratio of the focal length of the sixth lens L6 to the maximum focal length of the optical system 100, the sixth lens L6 can have a reasonable refractive power, which helps to reduce the overall spherical aberration, chromatic aberration, and distortion of the second lens group to a reasonable level, reduces the design difficulty of the rear lens, improves the overall resolving power of the optical system 100, and strengthens the peripheral aberration correction of the optical system 100. In addition, it is also beneficial to the size compression of the second lens group, thereby helping to form a small-size optical system 100. Optionally, the relationship further satisfies -2.3 < f6 / fmax < -1, which can achieve the miniaturization design of the optical system 100 while improving the imaging quality of the optical system 100.

[0077] In some embodiments, the optical system 100 satisfies the following relationship: 0.4 < f123 / fmax < 0.8; where f123 is the combined focal length of the first lens L1, the second lens L2, and the third lens L3. When the optical system 100 satisfies the relationship 0.4 < f123 / fmax < 0.8, the refractive power of the first lens group can be reasonably configured to avoid generating a large spherical aberration, thereby improving the overall resolving power of the optical system 100, and also being beneficial to the distance size compression between the first lens group and the second lens group, achieving a small stroke inner focusing mode. Optionally, the relationship can further satisfy 0.5 < f123 / fmax < 0.7, thereby reasonably distributing the refractive power of the first lens group G1, which is beneficial to improving the imaging quality of the optical system 100.

[0078] In some embodiments, the optical system 100 satisfies the following relationship: -0.9 < f456 / fmax < -0.4; where f456 is the combined focal length of the fourth lens L4, the fifth lens L5, and the sixth lens L6. When the optical system 100 satisfies the relationship -0.9 < f456 / fmax < -0.4, the absolute value of the refractive power of the second lens group is small, which is beneficial to compressing the movement stroke of the second lens group, thereby being beneficial to achieving continuous change from telephoto to close-up by moving the second lens group. Optionally, the relationship can further satisfy -0.8 < f456 / fmax < -0.5, thereby being able to further compress the movement stroke of the second lens group G2 to achieve continuous inner focusing.

[0079] In some embodiments, the optical system 100 satisfies the following relationship: -1.4 < f123 / f456 < -0.6. When the optical system 100 satisfies the relationship -1.4 < f123 / f456 < -0.6, the refractive power of the first lens group and the second lens group can be reasonably configured, the large spherical aberration generated by the first lens group can be avoided, and the overall resolving power of the optical system 100 can be improved. At the same time, the distance size between the first lens group and the second lens group at different object distances is compressed, which is helpful to form a small stroke focusing mode. In addition, the refractive power of the first lens group is greater than the refractive power of the second lens group, which can strengthen the light collecting ability of the optical system 100, and is also conducive to compressing the movement stroke of the second lens group, thereby realizing the miniaturization design of the optical system 100. Optionally, the relationship can further satisfy -1.2 < f123 / f456 < -0.8, so as to further compress the movement stroke of the second lens group G2, thereby realizing continuous internal focusing.

[0080] In some embodiments, the optical system 100 satisfies the following relationship: 2 < fmax / R11 < 3.5; wherein R11 is the curvature radius of the object side surface S1 of the first lens L1 at the optical axis. When the optical system 100 satisfies the relationship 2 < fmax / R11 < 3.5, the surface complexity of the first lens L1 can be reduced, thereby effectively inhibiting the increase of field curvature and distortion, and reducing the molding difficulty of the first lens L1. Optionally, the relationship can further satisfy 2.3 < fmax / R11 < 3.2, thereby being conducive to the molding of the first lens L1.

[0081] In some embodiments, the optical system 100 satisfies the following relationship: 0 < fmax / |R12| < 1.4; wherein R12 is the curvature radius of the image side surface S2 of the first lens L1 at the optical axis. When the optical system 100 satisfies the relationship 0 < fmax / |R12| < 1.4, the surface complexity of the first lens L1 can be reduced, thereby effectively inhibiting the increase of field curvature and distortion, and reducing the molding difficulty of the first lens L1.

[0082] In some embodiments, the optical system 100 satisfies the following relationship: 0.9 < fmax / R21 < 2.5, wherein R21 is the curvature radius of the object side surface S3 of the second lens L2 at the optical axis. When the optical system 100 satisfies the relationship, the surface complexity of the second lens L2 can be reduced, thereby effectively inhibiting the increase of field curvature and distortion, and reducing the molding difficulty of the second lens L2. Optionally, the relationship can further satisfy 1.1 < fmax / R21 < 2.5, thereby being conducive to the molding of the second lens L2.

[0083] In some embodiments, the optical system 100 satisfies the following relationship: 3 < fmax / R22 < 7, where R22 is the radius of curvature of the image-side surface S4 of the second lens L2 at the optical axis. When the optical system 100 satisfies this relationship, the surface complexity of the second lens L2 can be reduced, thereby effectively suppressing the increase in field curvature and distortion, while reducing the molding difficulty of the second lens L2. Alternatively, the relationship can further satisfy 4 < fmax / R22 < 6, thereby being able to facilitate the molding of the second lens L2.

[0084] In some embodiments, the optical system 100 satisfies the following relationship: 2 < fmax / R31 < 4, where R31 is the radius of curvature of the object-side surface of the third lens L3 at the optical axis. When the optical system 100 satisfies this relationship, the surface complexity of the third lens L3 can be reduced, thereby effectively suppressing the increase in field curvature and distortion, while reducing the molding difficulty of the third lens L3. Alternatively, the relationship can further satisfy 2.3 < fmax / R31 < 3.5, thereby being able to facilitate the molding of the third lens L3.

[0085] In some embodiments, the optical system 100 satisfies the following relationship: -2.7 < fmax / R32 < -1.6, where R32 is the radius of curvature of the image-side surface of the third lens L3 at the optical axis. When the optical system 100 satisfies this relationship, the surface complexity of the third lens L3 can be reduced, thereby effectively suppressing the increase in field curvature and distortion, while reducing the molding difficulty of the third lens L3. Alternatively, the relationship can further satisfy -2.5 < fmax / R32 < -1.8, thereby being able to facilitate the molding of the third lens L3.

[0086] In some embodiments, the optical system 100 satisfies the following relationship: 0 < fmax / |R41| < 2, where R41 is the radius of curvature of the object-side surface S7 of the fourth lens L4 at the optical axis. When the optical system 100 satisfies this relationship, the surface complexity of the fourth lens L4 can be reduced, thereby effectively suppressing the increase in field curvature and distortion, while reducing the molding difficulty of the fourth lens L4.

[0087] In some embodiments, the optical system 100 satisfies the following relationship: 1.3 < fmax / R42 < 3.5, where R42 is the radius of curvature of the image-side surface S8 of the fourth lens L4 at the optical axis. When the optical system 100 satisfies this relationship, the surface complexity of the fourth lens L4 can be reduced, thereby effectively suppressing the increase in field curvature and distortion, while reducing the molding difficulty of the fourth lens L4. Alternatively, the relationship can further satisfy 1.6 < fmax / R42 < 3.2, thereby being able to facilitate the molding of the fourth lens L4.

[0088] In some embodiments, the optical system 100 satisfies the following relationship: 1.8 < fmax / R51 < 4, where R51 is the radius of curvature of the object side surface S9 of the fifth lens L5 at the optical axis. When the optical system 100 satisfies the relationship, the surface complexity of the fifth lens L5 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, while reducing the difficulty of forming the fourth lens L4. Optionally, the relationship can further satisfy 2 < fmax / R51 < 3.7, thereby facilitating the forming of the fifth lens L5.

[0089] In some embodiments, the optical system 100 satisfies the following relationship: 0.4 < fmax / R52 < 2.4, where R52 is the radius of curvature of the image side surface S10 of the fifth lens L5 at the optical axis. When the optical system 100 satisfies the relationship, the surface complexity of the fifth lens L5 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, while reducing the difficulty of forming the fourth lens L4. Optionally, the relationship can further satisfy 0.5 < fmax / R52 < 2.1, thereby facilitating the forming of the fifth lens L5.

[0090] In some embodiments, the optical system 100 satisfies the following relationship: -2.3 < fmax / R61 < -0.8, where R61 is the radius of curvature of the object side surface S11 of the sixth lens L6 at the optical axis. When the optical system 100 satisfies the relationship, the surface complexity of the sixth lens L6 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, while reducing the difficulty of forming the sixth lens L6. In addition, the back focus of the optical system 100 can be effectively controlled, avoiding the total length of the optical system 100 being too long, thereby facilitating the miniaturization design of the optical system 100. Optionally, the relationship can further satisfy -1.9 < fmax / R61 < -1, thereby facilitating the forming of the sixth lens L6.

[0091] In some embodiments, the optical system 100 satisfies the following relationship: 2 < |R62| / fmax < 5, where R62 is the radius of curvature of the image side surface S12 of the sixth lens L6 at the optical axis. When the optical system 100 satisfies the relationship, the surface complexity of the sixth lens L6 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, while reducing the difficulty of forming the sixth lens L6. In addition, the back focus of the optical system 100 can be effectively controlled, avoiding the total length of the optical system 100 being too long, thereby facilitating the miniaturization design of the optical system 100.

[0092] In some embodiments, the optical system 100 satisfies the following relationship: 0 < R11 / |R12| < 0.5. By limiting the ratio of the curvature radius of the object side S1 of the first lens L1 and the curvature radius of the image side S2 of the first lens L1 at the near optical axis, the surface shape bending of the first lens L1 can be reasonably controlled, thereby facilitating the processing of the first lens L1, being conducive to improving the processing yield of the optical system 100, and effectively controlling the surface shape of the first lens L1, reducing the processing difficulty of the first lens L1.

[0093] In some embodiments, the optical system 100 satisfies the following relationship: 1.6 < R21 / R22 < 5. By limiting the ratio of the curvature radius of the object side S3 of the second lens L2 and the curvature radius of the image side S4 of the second lens L2 at the near optical axis, the surface shape bending of the second lens L2 can be reasonably controlled, thereby facilitating the processing of the second lens L2, being conducive to improving the processing yield of the optical system 100. Alternatively, the relationship can further satisfy 2.1 < R21 / R22 < 4.3, which can effectively control the surface shape of the second lens L2, reducing the processing difficulty of the second lens L2.

[0094] In some embodiments, the optical system 100 satisfies the following relationship: -0.9 < R31 / R32 < -0.5. By limiting the ratio of the curvature radius of the object side of the third lens L3 and the curvature radius of the image side of the third lens L3 at the near optical axis, the surface shape bending of the third lens L3 can be reasonably controlled, thereby facilitating the processing of the third lens L3, being conducive to improving the processing yield of the optical system 100. Alternatively, the relationship can further satisfy -0.8 < R31 / R32 < -0.6, which can effectively control the surface shape of the third lens L3, reducing the processing difficulty of the third lens L3.

[0095] In some embodiments, the optical system 100 satisfies the following relationship: 1.5 < |R41 / R42|. By limiting the ratio of the curvature radius of the object side S7 of the fourth lens L4 and the curvature radius of the image side S8 of the fourth lens L4 at the near optical axis, the surface shape bending of the fourth lens L4 can be reasonably controlled, thereby facilitating the processing of the fourth lens L4, being conducive to improving the processing yield of the optical system 100.

[0096] In some embodiments, the optical system 100 satisfies the following relationship: 0.1 < R51 / R52 < 1. By limiting the ratio of the curvature radius of the object side S9 of the fifth lens L5 and the curvature radius of the image side S10 of the fifth lens L5 at the near optical axis, the surface shape bending of the fifth lens L5 can be reasonably controlled, thereby facilitating the processing of the fifth lens L5, being conducive to improving the processing yield of the optical system 100. Alternatively, the relationship can further satisfy 0.15 < R51 / R52 < 0.9, which can effectively control the surface shape of the fifth lens L5, reducing the processing difficulty of the fifth lens L5.

[0097] In some embodiments, the optical system 100 satisfies the following relationship: 2.5<|R62 / R61|<5.5. When the relationship is satisfied, the surface curvature of the sixth lens L6 can be reasonably controlled, thereby facilitating the processing of the sixth lens L6 and improving the processing yield of the optical system 100.

[0098] In some embodiments, the optical system 100 satisfies the following relationship: -1<R11 / R32<-0.4. When the relationship is satisfied, the surface shapes of the first lens L1 and the third lens L3 are similar, thereby avoiding the problem of affecting the assembly of the first lens group due to excessive deviation between the first lens L1 and the third lens L3. Optionally, the relationship can further satisfy 0.9<R11 / R32<-0.6, thereby further facilitating the assembly of the first lens L1 and the third lens L3.

[0099] The optical system 100 of the present embodiment will be described in detail below in combination with specific parameters.

[0100] First embodiment

[0101] The structural schematic diagram of the optical system 100 disclosed by the first embodiment of the present application is shown in FIG. 1, which comprises, in order from the object side to the image side along the optical axis, a prism P1, a diaphragm STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter IR. Among them, the first lens L1, the second lens L2, and the third lens L3 constitute a first lens group, and the fourth lens L4, the fifth lens L5, and the sixth lens L6 constitute a second lens group. Figure 1A Figure 2A In the present embodiment, the object side surface S1 and the image side surface S2 of the first lens L1 are convex and concave respectively at the vicinity of the optical axis; the object side surface S3 and the image side surface S2 of the second lens L2 are convex and concave respectively at the vicinity of the optical axis; the object side surface S5 and the image side surface S6 of the third lens L3 are both convex at the vicinity of the optical axis; the object side surface S7 and the image side surface S8 of the fourth lens L4 are both concave at the vicinity of the optical axis; the object side surface S9 and the image side surface S10 of the fifth lens L5 are convex and concave respectively at the vicinity of the optical axis; and the object side surface S11 and the image side surface S12 of the sixth lens L6 are both concave at the vicinity of the optical axis.

[0102] In the present embodiment, the object side surface S1 and the image side surface 12 of the first lens L1 are convex and concave respectively at the vicinity of the optical axis; the object side surface S3 and the image side surface 22 of the second lens L2 are convex and concave respectively at the vicinity of the optical axis; the object side surface S5 and the image side surface S6 of the third lens L3 are both convex at the vicinity of the optical axis; the object side surface S7 and the image side surface S8 of the fourth lens L4 are both concave at the vicinity of the optical axis; the object side surface S9 and the image side surface S10 of the fifth lens L5 are convex and concave respectively at the vicinity of the optical axis; and the object side surface S11 and the image side surface S12 of the sixth lens L6 are both concave at the vicinity of the optical axis.

[0103] ​​Specifically, the parameters of the optical system 100 are given in the following Table 1. In Table 1, the elements along the optical axis of the optical system 100 are arranged in the order of the elements from top to bottom in Table 1 from the object side to the image side. In the same lens, the surface with a smaller surface serial number is the object side surface of the lens, and the surface with a larger surface serial number is the image side surface of the lens, for example, the surface serial numbers 1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radius in Table 1 is the radius of curvature of the object side surface or the image side surface with the corresponding surface serial number at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens at the optical axis, and the second value is the distance from the image side surface of the lens to the vertex of the next surface at the optical axis. The value in the "thickness" parameter column of the stop STO is the distance from the vertex of the stop STO to the vertex of the next surface at the optical axis, and the positive direction of the optical axis is the direction from the object side surface of the first lens L1 to the image side surface of the last lens. When the value is negative, it indicates that the stop STO is arranged on the image side of the vertex of the next surface. If the thickness of the stop STO is positive, the stop STO is on the object side of the vertex of the next surface. It can be understood that the units of the Y radius, thickness, and focal length in Table 1 are mm. The refractive index and Abbe number in Table 1 are obtained at a reference wavelength of 587.56 nm, and the focal length is obtained at a reference wavelength of 555 nm. Considering that the optical system 100 of the present application can realize internal focusing, it has a far focus state and a near focus state, and therefore has different object distances A in the far focus state and the near focus state. Meanwhile, the air gap T34 (i.e., B in Table 1) between the third lens L3 and the fourth lens L4 in the direction of the optical axis is different in the far focus state and the near focus state. As known from the foregoing, the filter IR can move along the optical axis with the second lens group. Based on this, the distance (i.e., C in Table 1 below) between the filter IR and the imaging surface IMG of the optical system 100 is also different in the far focus state and the near focus state.

[0104] Based on this, Table 2 is arranged, which gives the values of A, B, C, f, TTL, FNO, and FOV in the far focus state and the near focus state, respectively. In Table 2, the unit of FOV is deg, and the units of the other parameters are mm except that FNO has no unit.

[0105] In addition, the surface serial numbers 5 and 6 in Table 1 below and Table 3 below correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively, the surface serial numbers 3 and 4 correspond to the object side surface S3 and the image side surface S4 of the second lens L2, respectively, and so on. The surface serial numbers 13 and 14 correspond to the object side surface S11 and the image side surface S12 of the sixth lens L6, respectively.

[0106] In the first embodiment, the object side surface and the image side surface of any one of the first lens L1 to the sixth lens are aspherical surfaces, and the surface type x of each aspherical surface can be defined by, but not limited to, the following aspherical surface formula:

[0107]

[0108] wherein x is the sag of the aspherical surface at a position along the optical axis at a height h from the vertex of the aspherical surface; c is the curvature of the aspherical surface at the optical axis, c = 1 / Y (i.e., the paraxial curvature c is the inverse of the radius of curvature Y in Table 1 below); K is the conic constant; and Ai is the correction coefficient of the aspherical surface of the i-th order. Table 3 below gives the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 which can be used for the surface Nos. 5-16 in the first embodiment, wherein for the surface Nos. 13, 14, 15, and 16, the high-order term coefficients A22, A24, A26, A28, and A30 are also given.

[0109] Table 1

[0110]

[0111] Table 2

[0112] Variable distance A B C f FOV TTL FNO Tele state Infinity 0.48 6.25 26.5 12.32 28.3 2.7 Macro state 100 5.47 1.26 17.26 12 28.3 1.89

[0113] Table 3

[0114]

[0115]

[0116] Please refer to (A) in Figure 1B , Figure 2B (A) shows the longitudinal spherical aberration curves of the optical system 100 in the first embodiment at wavelengths of 435 nm, 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. Figure 1B , Figure 2B In (A) of Figure 1B , Figure 2B , the abscissa along the X-axis represents the focus shift, and the ordinate along the Y-axis represents the normalized field of view. It can be seen from (A) of Figure 1B , Figure 2B that the spherical aberration values of the optical system 100 in the first embodiment are better, indicating that the imaging quality of the optical system 100 in the embodiment is better.

[0117] Please refer to (B) in Figure 1B , Figure 2B (B) shows the lateral chromatic aberration curves of the optical system 100 in the first embodiment at wavelengths of 435 nm, 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm. Figure 1B , Figure 2B(B) in the figure shows the light astigmatism diagram of the optical system 100 in the first embodiment at a wavelength of 555 nm. The horizontal axis along the X-axis represents the focal shift, and the vertical axis along the Y-axis represents the image height, both in mm. In the astigmatism curve diagram, T represents the curvature of the imaging surface 101 in the meridional direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 1B , Figure 2B As can be seen from (B) in the figure, the astigmatism of the optical system 100 is well compensated at this wavelength.

[0118] Please see Figure 1B , Figure 2B (C) in the middle, Figure 1B , Figure 2B (C) in the figure is a distortion curve of the optical system 100 in the first embodiment at a wavelength of 555 nm. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height, in mm. Figure 3A , Figure 4A As can be seen from (C) in the figure, the distortion of the optical system 100 is well corrected at this wavelength.

[0119] Second Embodiment

[0120] like Variable distance , FOV As shown, in this embodiment, except that the image side of the sixth lens L6 is convex near the optical axis, the surface shape of the other lenses is the same as that in the first embodiment, and will not be described in detail here.

[0121] Specifically, the parameters of the optical system 100 are given in Table 4 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Correspondingly, Table 5 gives the values ​​of each parameter of the optical system in the telephoto and near-focus states, respectively. Table 6 below gives the higher-order coefficients that can be used for each aspherical lens in the second embodiment.

[0122] Table 4

[0123]

[0124] Table 5

[0125] TTL A B C f FNO Tele state Infinity Macro state Figure 3B 0.92 5.58 26.175 12.38 28.5 2.7 Figure 4B 100 5.47 1.03 17.285 12.3 28.5 1.91

[0126] Table 6

[0127]

[0128]

[0129] Please see Figure 3B , Figure 4B ,Depend on Figure 3B ,Figure 4B As can be seen from (A) the longitudinal spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment possesses good imaging quality. Furthermore, regarding... Figure 3B , Figure 4B (A) Figure 3B , Figure 4B (B) and Figure 1B , Figure 2B The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (A) Figure 1B , Figure 2B (B) Figure 5A , Figure 6A The content described in (C) will not be repeated here.

[0130] Third Embodiment

[0131] like Variable distance , FOV As shown, in this embodiment, among the object-side and image-side surfaces of the first lens L1 to the sixth lens L6 near the optical axis, only the object-side surface of the third lens L3 is convex near the optical axis, and the image-side surface of the sixth lens L6 is convex near the optical axis. The object-side and image-side surfaces of the other lenses are the same as those in the first embodiment.

[0132] Specifically, the parameters of the optical system 100 are given in Table 7 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Correspondingly, Table 8 gives the values ​​of each parameter of the optical system in the telephoto and near-focus states. Table 9 below gives the higher-order coefficients that can be used for each aspherical lens in the third embodiment.

[0133] Table 7

[0134]

[0135]

[0136] Table 8

[0137] TTL A B C f FNO Tele state Infinity Macro state Figure 5B 0.97 5.36 21.6 15.4 24 2.7 Figure 6B 100 5.47 0.86 15 14.8 24 2.07

[0138] Table 9

[0139]

[0140]

[0141] Please see Figure 5B , Figure 6BFrom the (A) longitudinal spherical aberration graph, (B) ray fan chart and (C) distortion graph in Figure 5B , Figure 6B , it can be seen that the longitudinal spherical aberration, the fan and the distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in (A) of Figure 5B , Figure 6B , (B) of Figure 5B , Figure 6B and (C) of Figure 1B , Figure 2B can refer to the descriptions of the wavelengths corresponding to the curves in (A) of Figure 1B , Figure 2B , (B) of Figure 1B , Figure 2B and (C) of Figure 7A , Figure 8A of the first embodiment, which will not be repeated here.

[0142] Fourth embodiment

[0143] As shown in Variable distance , FOV , in this embodiment, the surface type design of the first lens L1 to the sixth lens L6 is as follows: only the image side surface of the sixth lens L6 is convex at the near optical axis, and the surface types of the object side surface and the image side surface of the remaining lenses at the near optical axis are the same as those of the first embodiment.

[0144] Specifically, the parameters of the optical system 100 are given in Table 10 below. And the definitions of the parameters can be obtained from the descriptions of the previous embodiments, which will not be repeated here. Accordingly, Table 11 gives the values of the parameters of the optical system in the far focus state and the near focus state, respectively. Table 12 below gives the high-order term coefficients that can be used for the aspherical lenses in the fourth embodiment.

[0145] Table 10

[0146]

[0147] Table 11

[0148] TTL A B C f FNO Tele state Infinity Macro state Figure 7B 1.12 5.90 26.2 12.3 27.2 2.7 Figure 8B 100 5.47 1.55 17.4 12 27.2 1.89

[0149] Table 12

[0150]

[0151] Please refer to Figure 7B , Figure 8B , Figure 7B , Figure 8BAs can be seen from (A) the longitudinal spherical aberration curve, (B) the ray astigmatism curve, and (C) the distortion curve, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment possesses good imaging quality. Furthermore, regarding... Figure 7B , Figure 8B (A) Figure 7B , Figure 8B (B) and Figure 1B , Figure 2B The wavelengths corresponding to the curves in (C) can be referred to in the first embodiment regarding... Figure 1B , Figure 2B (A) Figure 1B , Figure 2B (B) Figure 9A , Figure 10A The content described in (C) will not be repeated here.

[0152] Fifth Embodiment

[0153] like Variable distance , FOV As shown, in this embodiment, among the object-side and image-side surfaces of the first lens L1 to the sixth lens L6 near the optical axis, only the image-side surface of the sixth lens L6 is convex, while the object-side and image-side surfaces of the other lenses are the same as those in the first embodiment.

[0154] Specifically, the parameters of the optical system 100 are given in Table 13 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Correspondingly, Table 14 gives the values ​​of each parameter of the optical system in the telephoto and near-focus states, respectively. Table 15 gives the higher-order coefficients that can be used for each aspherical lens in the fifth embodiment.

[0155] Table 13

[0156]

[0157] Table 14

[0158] TTL A B C f FNO Tele state Infinity Macro state Figure 9B 1.47 5.79 25.7 12.52 26.7 2.7 Figure 10B 100 5.47 1.79 17.5 12 26.7 1.91

[0159] Table 15

[0160]

[0161]

[0162] Please see Figure 9B , Figure 10B ,Depend on Figure 9B , Figure 10BFrom the (A) longitudinal spherical aberration graph, (B) ray fan graph, and (C) distortion graph in FIG. 16, it can be seen that the longitudinal spherical aberration, the fan, and the distortion of the optical system 100 are well controlled, so that the optical system 100 of this embodiment has good imaging quality. In addition, the wavelengths corresponding to the curves in (A) of FIG. 16, (B) of FIG. 17, and (C) of FIG. 18 can refer to the descriptions about the wavelengths corresponding to the curves in (A) of FIG. 5, (B) of FIG. 6, and (C) of FIG. 7 of the first embodiment, which will not be repeated here. Figure 9B 、 Figure 10B (A) of FIG. 16, Figure 9B 、 Figure 10B (B) of FIG. 17, and Figure 1B 、 Figure 2B (C) of FIG. 18, which will not be repeated here. Figure 1B 、 Figure 2B (A) of FIG. 16, Figure 1B 、 Figure 2B (B) of FIG. 17, Figure 11 、 Figure 12 (C) of FIG. 18, which will not be repeated here.

[0163] Referring to Table 16, Table 16 is a summary of the ratios of the various relationships in the first embodiment to the fifth embodiment of the present application.

[0164] Table 16

[0165]

[0166]

[0167] Table 17 is a summary of the values of other parameters of the optical system in the first embodiment to the fifth embodiment of the present application. Among them, f1, f2, f3, f4, f5, f6 are the focal lengths of the first lens L1 to the sixth lens L6, respectively. R1, R2 are the radii of curvature of the object side and the image side of the first lens L1 at the optical axis, respectively, R3, R4 are the radii of curvature of the object side and the image side of the second lens L2 at the optical axis, respectively, R5, R6 are the radii of curvature of the object side and the image side of the third lens L3 at the optical axis, respectively, R7, R8 are the radii of curvature of the object side and the image side of the fourth lens L4 at the optical axis, respectively, R9, R10 are the radii of curvature of the object side and the image side of the fifth lens L5 at the optical axis, respectively, R11, R12 are the radii of curvature of the object side and the image side of the sixth lens L6 at the optical axis, respectively.

[0168] Table 17

[0169]

[0170]

[0171] Please refer to ​The application further discloses a camera module 200, which comprises an image sensor 201 and the optical system 100 according to any one of the first aspect and the first to fifth embodiments.

[0172] Please refer to ​ The application further discloses an electronic device 300, which comprises a shell 301 and the camera module 200. The camera module 200 is arranged on the shell. Specifically, the camera module 200 can be arranged inside the shell 301 or on the shell 301. The electronic device 300 can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor and the like. It can be understood that the electronic device 300 with the camera module 200 also has all the technical effects of the optical system 100. That is, the electronic device 300 can be miniaturized and thinned while having a large image surface, thereby improving the imaging quality. Since the technical effects have been described in detail in the embodiments of the optical system 100, they will not be repeated here.

[0173] The optical system, the camera module and the electronic device disclosed in the embodiments of the application are described in detail above, and the principles and implementation manners of the application are described by applying specific examples. The above description of the embodiments is only used to help understand the optical system, the camera module and the electronic device and the core idea thereof; meanwhile, for those skilled in the art, the specific implementation manners and application ranges can be changed according to the idea of the application. In conclusion, the content of the specification should not be understood as a limitation of the application.

Claims

1. An optical system characterized by comprising: comprises, in order from the object side to the image side along the optical axis: a first lens group, the first lens group comprising, in order from the object side to the image side along the optical axis: a first lens having positive refractive power, an object side surface of the first lens being convex at a vicinity of the optical axis, a second lens having negative refractive power, an object side surface of the second lens being convex at a vicinity of the optical axis, an image side surface of the second lens being concave at a vicinity of the optical axis, and a third lens having positive refractive power, both an object side surface and an image side surface of the third lens being convex at a vicinity of the optical axis; and a second lens group, the second lens group comprising, in order from the object side to the image side along the optical axis: a fourth lens having negative refractive power, an image side surface of the fourth lens being concave at a vicinity of the optical axis, a fifth lens having positive refractive power, an object side surface of the fifth lens being convex at a vicinity of the optical axis, an image side surface of the fifth lens being concave at a vicinity of the optical axis, and a sixth lens having negative refractive power, an object side surface of the sixth lens being concave at a vicinity of the optical axis; wherein the first lens group is fixed relative to an imaging plane of the optical system, and the second lens group is movable along the optical axis between the first lens group and the imaging plane of the optical system; the optical system satisfies the following relationship: 5 deg < FOV < 20 deg, and 1.5 < FNO < 3.2; 2. The optical system of claim 1, wherein FOV is a maximum field angle of the optical system, and FNO is an F-number of the optical system. the optical system satisfies the following relationship: 0.4 < f1 / fmax < 1.5, and / or -0.9 < f2 / fmax < -0.3, and / or 0.25 < f3 / fmax < 0.6, and / or -1.2 < f4 / fmax < -0.25, and / or 0.5 < f5 / fmax < 3.2, and / or -3 < f6 / fmax < -0.9, and / or -1.4 < f123 / f456 < -0.6, and / or 0.4 < f123 / fmax < 0.8, and / or -0.9 < f456 / fmax < -0.4; 3. The optical system of claim 1, wherein wherein f1 is a focal length of the first lens, f2 is a focal length of the second lens, f3 is a focal length of the third lens, f4 is a focal length of the fourth lens, f5 is a focal length of the fifth lens, f6 is a focal length of the sixth lens, fmax is a maximum focal length of the optical system, f123 is a combined focal length of the first lens, the second lens, and the third lens, and f456 is a combined focal length of the fourth lens, the fifth lens, and the sixth lens. the optical system satisfies the following relationship: 2 < fmax / R11 < 3.5, and / or, 0.9 < fmax / R21 < 2.5, and / or, 3 < fmax / R22 < 7, and / or, 2 < fmax / R31 < 4, and / or, -2.7 < fmax / R32 < -1.6, and / or, 1.3 < fmax / R42 < 3.5, and / or, 1.8 < fmax / R51 < 4, and / or, 0.4 < fmax / R52 < 2.4, and / or, -2.3 < fmax / R61 < -0.8; wherein R11 is a radius of curvature of an object side surface of the first lens at the optical axis, R21 is a radius of curvature of an object side surface of the second lens at the optical axis, R22 is a radius of curvature of an image side surface of the second lens at the optical axis, R31 is a radius of curvature of an object side surface of the third lens at the optical axis, R32 is a radius of curvature of an image side surface of the third lens at the optical axis, R42 is a radius of curvature of an image side surface of the fourth lens at the optical axis, R51 is a radius of curvature of an object side surface of the fifth lens at the optical axis, R52 is a radius of curvature of an image side surface of the fifth lens at the optical axis, R61 is a radius of curvature of an object side surface of the sixth lens at the optical axis, and fmax is a maximum focal length of the optical system.

4. The optical system of claim 1, wherein The optical system satisfies the following relational expression: 1.6 < R21 / R22 < 5, and / or, -0.9 < R31 / R32 < -0.5, and / or, 0.1 < R51 / R52 < 1, and / or, -1 < R11 / R32 < -0.4; wherein R21 is a radius of curvature of an object side surface of the second lens at the optical axis, R22 is a radius of curvature of an image side surface of the second lens at the optical axis, R31 is a radius of curvature of an object side surface of the third lens at the optical axis, R32 is a radius of curvature of an image side surface of the third lens at the optical axis, R51 is a radius of curvature of an object side surface of the fifth lens at the optical axis, R52 is a radius of curvature of an image side surface of the fifth lens at the optical axis, and R11 is a radius of curvature of an object side surface of the first lens at the optical axis.

5. The optical system of claim 1, wherein The optical system satisfies the following relational expression: 0.7 < DLmax / TTL < 1, and / or, 0.8 < TTL / fmax < 1.3, and / or, 3.3 < TTL / ImgH < 6, and / or, 0.8 < TD123 / TD456 < 1.5, and / or, 1.1 < TTL / (TD123+TD456) < 1.7; wherein DLmax is a maximum distance on the optical axis from the object side surface of the first lens to the image side surface of the sixth lens, TTL is a distance on the optical axis from the object side surface of the first lens to an imaging surface of the optical system, ImgH is a half of an image height corresponding to a maximum field angle of view of the optical system, TD123 is a distance on the optical axis from the object side surface of the first lens to the image side surface of the third lens, TD456 is a distance on the optical axis from the object side surface of the fourth lens to the image side surface of the sixth lens, and fmax is a maximum focal length of the optical system.

6. The optical system of claim 1, wherein The optical system satisfies the following relational expression: 0.55 < SD11 / ImgH < 1.1, and / or, 0.7 < SD62 / ImgH < 1.2, and / or, 0.8 < SD32 / SD41 < 1.2, and / or, 0.7 < SD11 / CT1 < 1.5; wherein, SD11 is a maximum effective half aperture of an object side surface of the first lens, SD32 is a maximum effective half aperture of an image side surface of the third lens, SD41 is a maximum effective half aperture of an object side surface of the fourth lens, SD62 is a maximum effective half aperture of an image side surface of the sixth lens, ImgH is a half of an image height corresponding to a maximum field angle of the optical system, and CT1 is a thickness of the first lens on the optical axis.

7. The optical system of claim 1, wherein The optical system satisfies the following relationship: 0.4 < CT123 / ∑CT < 0.7, and / or, 0.3 < CT456 / ∑CT < 0.6, and / or, 0.15 < CT5 / ∑CT < 0.35, and / or, 1.2 < CT5 / CT6 < 4, and / or, 1.4 < CT1 / CT2 < 3.5, and / or, 0.7 < CT3 / CT2 < 3, and / or, 2 < CT5 / CT4 < 5, and / or, 0.5 < CT4 / CT6 < 1.1; wherein, CT123 is a sum of thicknesses of the first lens, the second lens and the third lens on the optical axis, CT456 is a sum of thicknesses of the fourth lens, the fifth lens and the sixth lens on the optical axis, ∑CT is a sum of thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens on the optical axis, CT1 is a thickness of the first lens on the optical axis, CT2 is a thickness of the second lens on the optical axis, CT3 is a thickness of the third lens on the optical axis, CT4 is a thickness of the fourth lens on the optical axis, CT5 is a thickness of the fifth lens on the optical axis, and CT6 is a thickness of the sixth lens on the optical axis.

8. The optical system of claim 1, wherein, The optical system satisfies the following relationship: 1.35 < fz1 / fz2 < 2, and / or, 1.1 < FNOz1 / FNOz2 < 1.7, and / or, 2 < Bz2 / Bz1; wherein, fz1 is a focal length of the optical system in a far focus state, fz2 is a focal length of the optical system in a near focus state, FNOz1 is an aperture number of the optical system in the far focus state, FNOz2 is an aperture number of the optical system in the near focus state, Bz2 is a distance from the image side surface of the third lens to the object side surface of the fourth lens on the optical axis when the optical system is in the far focus state, and Bz1 is a distance from the image side surface of the third lens to the object side surface of the fourth lens on the optical axis when the optical system is in the near focus state.

9. An image capture module, comprising: The camera module comprises an image sensor and the optical system according to any one of claims 1-8, wherein the image sensor is disposed on an image side of the optical system.

10. An electronic device, comprising: The electronic device comprises a housing and the camera module according to claim 9, wherein the camera module is disposed in the housing.

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