Optical lens, camera module and electronic device

Abstract

An optical lens, an imaging module, and an electronic device are provided. A first lens group of the optical lens includes a first lens with positive refractive power, and an object side surface and an image side surface of the first lens at a paraxial region are respectively a convex surface and a flat surface. A second lens group of the optical lens includes a second lens, a third lens, a fourth lens, and a fifth lens sequentially arranged from an object side to an image side along an optical axis. The second lens has negative refractive power, and an object side surface and an image side surface of the second lens at a paraxial region are respectively a convex surface and a concave surface. The third lens has positive refractive power, and an object side surface and an image side surface of the third lens at a paraxial region are respectively a convex surface and a concave surface. The fourth lens has refractive power, and the fifth lens has refractive power. The second lens group moves along the optical axis direction between the first lens group and an imaging surface of the optical lens. The optical lens satisfies the following relational expressions: 18deg<FOV<28deg, and 2.1<FNO<2.8. The optical lens, the imaging module, and the electronic device disclosed in the present application can reduce the impact on focusing speed on the basis of taking into account the miniaturization design.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical imaging, and in particular, to an optical lens, an imaging module, and an electronic device. BACKGROUND ART

[0002] As the demand for miniaturization of intelligent terminals such as mobile phones and tablet computers is increasing, new challenges are imposed on the design of optical lenses disposed in the mobile phones and the tablet computers. In the related art, the focusing manner of an optical lens is generally implemented by moving the entire lens through a focusing motor to make an imaging plane of the lens coincide with a photosensitive surface of a photosensitive chip. Therefore, a relatively large space (mechanical back focal length) needs to be reserved between the lens and the photosensitive chip. In this case, not only the requirement on the power of the focusing motor for moving the entire lens is relatively high, resulting in a relatively large size of the focusing motor and a significant decrease in focusing speed, but also due to the miniaturization requirement of the intelligent terminals, the manner of moving the entire lens leads to high difficulty in design and manufacture of the optical lens, making mass production difficult to achieve. SUMMARY OF THE INVENTION

[0003] Embodiments of the present application disclose an optical lens, an imaging module, and an electronic device, which can reduce the impact on the focusing speed on the basis of giving consideration to the miniaturization design, and are easy to design and manufacture, thus facilitating mass production.

[0004] To achieve the above objective, in a first aspect, the present application discloses an optical lens, comprising, sequentially disposed from an object side to an image side along an optical axis:

[0005] a first lens group, wherein the first lens group comprises a first lens, the first lens has positive refractive power, and an object side surface of the first lens is a convex surface at a position near the optical axis;

[0006] a second lens group, wherein the second lens group comprises a second lens, a third lens, a fourth lens and a fifth lens which are sequentially disposed from the object side to the image side along the optical axis, the second lens has negative refractive power, an object side surface of the second lens is a convex surface at a position near the optical axis, an image side surface of the second lens is a concave surface at a position near the optical axis, the third lens has positive refractive power, an object side surface of the third lens is a convex surface at a position near the optical axis, the fourth lens has refractive power, and the fifth lens has refractive power;

[0007] wherein the first lens group is fixed relative to an imaging plane of the optical lens, and the second lens group moves along the optical axis direction between the first lens group and the imaging plane of the optical lens, so that the optical lens switches between a near focus state and a far focus state;

[0008] the optical lens satisfies the following relational expressions: 18deg<FOV<28deg, and 2.1<FNO<2.8;

[0009] FOV is the maximum field of view of the optical lens, and FNO is the aperture number of the optical lens.

[0010] Secondly, this application discloses a camera module, which includes an image sensor and an optical lens as described in the first aspect above, wherein the image sensor is disposed on the image side of the optical lens. The camera module with the aforementioned optical lens can reduce the impact on focusing speed while maintaining a miniaturized design, and is also easy to design and manufacture, facilitating mass production.

[0011] Thirdly, this application discloses an electronic device comprising a housing and a camera module as described in the second aspect above, the camera module being disposed within the housing. An electronic device having the aforementioned camera module can reduce the impact on focusing speed while maintaining a miniaturized design, and is also easy to design and manufacture, facilitating mass production.

[0012] Compared with the prior art, the beneficial effects of this application are as follows:

[0013] In the optical lens provided in this application, to achieve miniaturization while reducing the impact on focusing speed, five lenses are divided into a first lens group and a second lens group. The first lens group is fixed relative to the imaging plane of the optical lens, while the second lens group can move along the optical axis between the first lens group and the imaging plane of the optical lens. This enables the optical lens to have continuous internal focusing functionality. Furthermore, by utilizing only the movement of the second lens group, the load on the motor is further reduced, achieving fast internal focusing with a lower-power motor. In addition, using five refractive lenses evenly distributes the pressure of light refraction across each lens, reducing the workload of individual lens refraction and preventing excessive lens bending that could increase tolerance sensitivity.

[0014] Specifically, the first lens has positive refractive power, and in combination with the design that its object side surface is convex at the paraxial region, it can facilitate better entry of light into the first lens. The second lens has negative refractive power, and its object side surface and image side surface are respectively convex and concave at the paraxial region, which can help correct the aberration generated by the first lens and improve the imaging effect of the optical lens. The third lens has positive refractive power, and its object side surface is convex at the paraxial region, which can help reduce the incident angle of light entering the optical lens, so that as much light as possible enters the optical lens. The fourth lens has refractive power, which is beneficial for correcting spherical aberration, coma and distortion generated by the first lens group, further improving the imaging quality of the optical lens. The fifth lens has refractive power, which can shorten the total length of the optical lens and correct aberrations, and at the same time can reduce the exit angle of light, facilitating the imaging of large-angle light incident on the imaging surface of the optical lens, and helping to improve the imaging quality.

[0015] In addition, the optical lens satisfies the relational expressions: 18deg<FOV<28deg, and 2.1<FNO<2.8, which can have the characteristics of a large aperture, a small field of view, and telephoto imaging. Brief Description of the Drawings

[0016] In order to more clearly describe the technical solutions in the embodiments of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without any creative effort.

[0017] Figure 1A is a schematic structural diagram of the optical lens disclosed in the first embodiment of the present application in the far-focus state;

[0018] Figure 1B is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present application in the far-focus state;

[0019] Figure 1C is a schematic optical path diagram of the optical lens disclosed in the first embodiment of the present application in the far-focus state;

[0020] Figure 2A is a schematic structural diagram of the optical lens disclosed in the first embodiment of the present application in the near-focus state;

[0021] Figure 2B is a longitudinal spherical aberration diagram (mm), an astigmatism curve diagram (mm) and a distortion curve diagram (%) of the optical lens disclosed in the first embodiment of the present application in the near-focus state;

[0022] Figure 2CThis is a schematic diagram of the optical path of the optical lens in a near-focus state as disclosed in the first embodiment of this application;

[0023] Figure 3A This is a schematic diagram of the optical lens in telephoto mode disclosed in the second embodiment of this application;

[0024] Figure 3B The diagrams shown in the second embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in the telephoto state.

[0025] Figure 4A This is a schematic diagram of the optical lens in a near-focus state as disclosed in the second embodiment of this application;

[0026] Figure 4B The diagrams shown in the second embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in near-focus state.

[0027] Figure 5A This is a schematic diagram of the optical lens in telephoto mode disclosed in the third embodiment of this application;

[0028] Figure 5B The diagrams shown in the third embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in the telephoto state.

[0029] Figure 6A This is a schematic diagram of the optical lens disclosed in the third embodiment of this application in a near-focus state;

[0030] Figure 6B The diagrams shown in the third embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in a near-focus state.

[0031] Figure 7A This is a schematic diagram of the optical lens in telephoto mode disclosed in the fourth embodiment of this application;

[0032] Figure 7B The diagrams shown in the fourth embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in the telephoto state.

[0033] Figure 8A This is a schematic diagram of the optical lens disclosed in the fourth embodiment of this application in a near-focus state;

[0034] Figure 8B The diagrams shown in the fourth embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in a near-focus state.

[0035] Figure 9A This is a schematic diagram of the optical lens in telephoto mode disclosed in the fifth embodiment of this application;

[0036] Figure 9B The diagrams shown in the fifth embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in the telephoto state.

[0037] Figure 10A This is a schematic diagram of the optical lens disclosed in Embodiment 5 of this application in a near-focus state;

[0038] Figure 10B The diagrams shown in the fifth embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in a near-focus state.

[0039] Figure 11A This is a schematic diagram of the optical lens in telephoto mode disclosed in the sixth embodiment of this application;

[0040] Figure 11B The diagrams shown in the sixth embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in the telephoto state.

[0041] Figure 12A This is a schematic diagram of the optical lens disclosed in Embodiment 6 of this application in a near-focus state;

[0042] Figure 12B The diagrams shown in the sixth embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in a near-focus state.

[0043] Figure 13A This is a schematic diagram of the optical lens in telephoto mode disclosed in the 7th embodiment of this application;

[0044] Figure 13B The diagrams shown in the seventh embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in the telephoto state.

[0045] Figure 14A This is a schematic diagram of the optical lens disclosed in Embodiment 7 of this application in a near-focus state;

[0046] Figure 14B The diagrams shown in the seventh embodiment of this application are the longitudinal spherical aberration diagram (mm), astigmatism curve diagram (mm), and distortion curve diagram (%) of the optical lens in a near-focus state.

[0047] Figure 15 This is a schematic diagram of the camera module disclosed in this application;

[0048] Figure 16 This is a schematic diagram of the structure of the electronic device disclosed in this application. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0050] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0051] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0052] Please see Figure 1A , Figure 1C , Figure 2A and Figure 2C According to a first aspect of this application, an optical lens 100 is disclosed. The optical lens 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, and the second lens group G2 includes a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 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 surface IMG of the optical lens 100. The second lens group G2 moves along the optical axis between the first lens group G1 and the imaging surface IMG of the optical lens 100, allowing the optical lens 100 to switch between a near-focus state and a far-focus state, thereby enabling the optical lens 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 lens 100 can be further reduced, achieving a fast internal focusing effect for the optical lens 100 using a lower-power motor.

[0053] It is understandable that "close focus" refers to the object distance of the optical lens 100 being 300mm. "Telefocus" refers to the object distance of the optical lens 100 being infinity.

[0054] Optionally, 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 either negative or positive refractive power, and the fifth lens L5 has either positive or negative refractive power. During imaging, light rays enter the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 sequentially from the object side of the first lens L1, and are finally imaged onto the imaging plane IMG of the optical lens 100.

[0055] 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 flat, convex, or concave 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 of the third lens L3 is convex near the optical axis, and the image-side surface S6 of the third lens L3 can be concave or convex near the optical axis; the object-side surface S7 of the fourth lens L4 can be concave or convex near the optical axis, and the image-side surface S8 of the fourth lens L4 can be concave or convex near the optical axis; the object-side surface S9 of the fifth lens L5 can be convex or concave near the optical axis, and the image-side surface S10 of the fifth lens L5 can be concave or convex near the optical axis.

[0056] By designing the refractive power and surface shape of the five lenses, specifically, the first lens L1 has positive refractive power, and its object-side surface is convex near the optical axis, which facilitates the convergence of incident light within the field of view; the second lens L2 has negative refractive power, and the object-side surface S3 and image-side surface of the second lens L2 are convex and concave near the optical axis, respectively, which helps to correct the aberrations generated by the first lens L1; the third lens L3 has positive refractive power, and its object-side surface is convex near the optical axis, which helps to reduce the amount of light entering the optical lens 100 from the front lens, thereby reducing the incident angle of light; the fourth lens L4 has refractive power, which helps to correct spherical aberration, coma, and distortion generated by the first lens group; the fifth lens L5 has refractive power, which can effectively control the overall length of the optical lens 100, which helps to correct distortion and astigmatism, and can also control the exit angle of light, which is conducive to large-angle light entering the imaging plane IMG of the optical lens 100, further improving the imaging quality of the optical lens 100.

[0057] In some embodiments, the optical lens 100 can be applied to electronic devices such as smartphones and tablets. Therefore, the materials of the first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5 can be plastic, so as to achieve a lightweight optical lens 100 while making it easier to process complex lens surfaces. Of course, the above is only an example. In other examples, the materials of the first lens L1 to the fifth lens L5 can also be, for example, glass, or some lenses can be made of glass and some lenses can be made of plastic. That is, the optical lens 100 can also be a glass-plastic hybrid lens. This application does not make specific limitations in this regard.

[0058] In some embodiments, the optical lens 100 may also include a reflector LP, which may be a prism or a mirror, thereby enabling the optical lens 100 to be configured as a periscope lens, that is, the optical lens 100 to have a telephoto function.

[0059] Optionally, the reflector LP may be disposed between the first lens group G1 and the second lens group G2. Specifically, the reflector LP has an incident surface LP1, a reflecting surface RF, and an emitting surface LP2. The first lens group G1 is located on the side where the incident surface LP1 of the reflector LP is located, and the second lens group G2 is located on the side where the emitting surface LP2 of the reflector LP is located. The reflector LP is fixed relative to the imaging surface IMG of the optical lens 100. Imaging light sequentially passes through the first lens group G1 and is transmitted through the incident surface LP1 into the reflector LP, reflected by the first reflecting surface RF to the emitting surface LP2, and then transmitted through the emitting surface LP2 to the second lens group G2.

[0060] Optionally, the reflector LP can be connected to the image-side surface of the first lens L1, thereby fixing the reflector LP relative to the imaging surface of the optical lens 100. For example, the light-incident surface LP1 of the reflector LP can be planar near the optical axis. When the image-side surface of the first lens L1 is planar, the light-incident surface LP1 of the reflector LP can be attached to the image-side surface of the first lens L1. Of course, the reflector LP can also be spaced apart from the image-side surface of the first lens L1 along the optical axis; this embodiment does not specifically limit this.

[0061] Understandably, the reflector LP is fixed relative to the imaging surface of the optical lens 100. When the second lens group G2 switches between near-focus and telephoto states, what changes is the distance on the optical axis from the light-emitting surface LP2 of the reflector LP to the object-side surface of the second lens L2. In other words, in the telephoto state, the second lens group G2 moves away from the reflector LP, meaning the second lens L2 is furthest from the light-emitting surface of the reflector LP. Conversely, in the near-focus state, the second lens group G2 moves closer to the reflector LP, meaning the second lens L2 is closest to the light-emitting surface of the reflector LP.

[0062] For example, such as Figure 1C and Figure 2C As shown, light is transmitted through the first lens L1 from the incident surface LP1 to the reflector LP, reflected by the reflector RF to the exit surface LP2, and then exited through the exit surface LP2 to the second lens L2. The light is then transmitted through the second lens L2 to the third lens L3, the fourth lens L4 and the fifth lens L5 in sequence, and finally formed on the imaging surface of the optical lens 100.

[0063] In some embodiments, the optical lens 100 further includes an aperture stop STO, which can be an aperture stop and / or a field stop, and can be disposed on the object side of the first lens L1. It is understood that in other embodiments, the aperture stop STO can also be disposed between two other lenses, for example, between the second lens L2 and the third lens L3, or between the fourth lens L4 and the fifth lens L5. The specific placement can be adjusted according to actual conditions, and this embodiment does not impose specific limitations.

[0064] In some embodiments, the optical lens 100 further includes a filter IR, which is disposed in the second lens group G2 and located between the fifth lens L5 and the imaging surface IMG of the optical lens 100. The filter IR can move along the optical axis between the fifth lens L5 and the imaging surface IMG of the optical lens 100 under the influence of the second lens group. That is, when the second lens group G2 moves relative to the first lens group G1 along the optical axis, the filter IR can move with the second lens group G2. Therefore, when the optical lens 100 is applied to a camera module, compared to the related technology that places the filter IR on the image sensor, it can effectively simplify the packaging of the image sensor and also facilitate the thinner and lighter design of the image sensor. Optionally, the filter IR can be an infrared cut-off filter. Using an infrared cut-off filter can filter out infrared light, improve image quality, and make the image more consistent with the visual experience of the human eye. It is 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. In this embodiment, no specific limitation is made.

[0065] Understandably, since the filter IR moves with the second lens group G2, the distance between the filter IR and the imaging plane IMG of the optical lens changes when the optical lens 100 switches between near-focus and far-focus states.

[0066] In some embodiments, the optical lens 100 satisfies the following relational expression: 18deg<FOV<28deg; where FOV is the maximum field of view of the optical lens 100. When the optical lens 100 satisfies the relational expression 5deg<FOV<20deg, the optical lens 100 can achieve the effects of a small field of view and telephoto performance.

[0067] In some embodiments, the optical lens 100 satisfies the relational expression: 2.1<FNO<2.8. In this way, the optical lens 100 can have the characteristic of a large aperture.

[0068] In some embodiments, the optical lens 100 satisfies the relational expression: 6.1<TTL / ImgH<7.2, where TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging plane IMG of the optical lens 100 (i.e., the total length of the optical lens 100), and ImgH is half of the image height corresponding to the maximum field of view of the optical lens 100. By limiting the ratio of the total length of the optical lens 100 to half of the image height corresponding to the maximum field of view of the optical lens 100, it is possible to make the optical lens 100 have good imaging performance while realizing a miniaturized design.

[0069] In some embodiments, the optical lens 100 satisfies the relational expression: 3.85<43.27*fi / (2*ImgH*23)<4.7, where fi is the focal length of the optical lens 100 in the telephoto state. When this relational expression is satisfied, the focal length of the optical lens 100 in the telephoto state can be utilized, so that the optical lens 100 has a larger zoom ratio, which is beneficial to improving the telephoto capability of the optical lens.

[0070] In some embodiments, the optical lens 100 satisfies the relational expression: 3.5<fi / BFL1<4.1, where BFL1 is the distance on the optical axis from the image-side surface of the fifth lens L5 to the imaging plane IMG of the optical lens 100 when the optical lens 100 is in the telephoto state (that is, the back focal length of the optical lens 100). When this relational expression is satisfied, on the basis of meeting the miniaturized design of the optical lens 100, it is ensured that the fifth lens L5 has a sufficient moving distance, which is beneficial to the switching between the near focus and the telephoto focus of the optical lens 100.

[0071] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.6 < SD3 / SD1 < 1, where SD1 is the maximum effective half-aperture of the object-side surface S1 of the first lens L1, and SD3 is the maximum effective half-aperture of the object-side surface S3 of the second lens L2. By limiting the ratio of the maximum effective half-aperture of the object-side surface S3 of the second lens L2 to the maximum effective half-aperture of the object-side surface S1 of the first lens L1, the aperture of the object-side surface S1 of the first lens L1 can be made appropriate, and the difference between the apertures of the object-side surfaces of the first lens L1 and the second lens L2 will not be too large, avoiding a large step difference formed therebetween, which facilitates the light to be better reflected by the reflecting element from the first lens L1 and then exit into the second lens L2. Meanwhile, the height of the second lens L2 can also be reduced, thereby realizing the miniaturized design of the optical lens.

[0072] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.8 < CT2 / SAG21 < 2.7, where CT2 is the thickness of the second lens L2 on the optical axis, and SAG21 is the distance in the optical axis direction from the position of the maximum effective half-aperture of the object-side surface of the second lens L2 to the intersection point of the object-side surface of the second lens and the optical axis. When this relational expression is satisfied, it is beneficial to the convergence of incident light, and also conducive to correcting the distortion and field curvature generated by the first lens, improving the resolving power of the optical lens 100. In addition, satisfying the above formula can also reasonably control the refractive power and thickness of the second lens L2 in the vertical axis direction (the direction perpendicular to the optical axis), avoid the lens being too thin or too thick, reduce the incident angle of light on the imaging surface of the optical lens 100, and lower the sensitivity of the optical lens 100.

[0073] In some embodiments, the optical lens 100 satisfies the relational expression: 0.5 < CT2 / SAG22 < 1.3, where SAG22 is the distance in the optical axis direction from the position of the maximum effective half-aperture of the image-side surface of the second lens L2 to the intersection point of the image-side surface of the second lens and the optical axis. When this relational expression is satisfied, it is beneficial to the convergence of incident light, and also conducive to correcting the distortion and field curvature generated by the first lens L1, improving the resolving power of the optical lens 100. In addition, satisfying the above formula can also reasonably control the refractive power and thickness of the second lens L2 in the vertical axis direction (the direction perpendicular to the optical axis), avoid the lens being too thin or too thick, reduce the incident angle of light on the imaging surface of the optical lens 100, and lower the sensitivity of the optical lens 100.

[0074] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.1 < CT3 / CT2 < 8, where CT3 is the thickness of the third lens L3 on the optical axis. When this relational expression is satisfied, the thicknesses of the third lens L3 and the second lens L2 can be effectively controlled, the miniaturized design of the optical lens 100 can be realized, and at the same time, it is beneficial to reduce the sensitivity of the optical lens 100.

[0075] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.9<CT4 / CT5<3.7, where 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 this relational expression is satisfied, the thicknesses of the fifth lens L5 and the fourth lens L4 can be effectively controlled, the miniaturization design of the optical lens 100 is realized, and at the same time, it is beneficial to reduce the sensitivity of the optical lens 100.

[0076] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.5<ΣCT / CT23<3, where CT23 is the sum of the thicknesses of the second lens L2 and the third lens L3 on the optical axis, and ΣCT is the sum of the thicknesses of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 on the optical axis. By limiting the ratio of the total thickness of all lenses of the optical lens 100 to the sum of the thicknesses of the second lens L2 and the third lens L3, the overall thickness of the second lens and the third lens can be reasonably controlled, and the sum of the thicknesses of the second lens L2 and the third lens L3 accounts for a relatively high proportion of the total thickness of all lenses of the optical lens 100, which can not only realize the miniaturization of the optical lens 100, but also facilitate the processing and assembly of the second lens L2 and the third lens L3.

[0077] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.8<ΣCT / CT45<4.5, where CT45 is the sum of the thicknesses of the fourth lens L4 and the fifth lens L5 on the optical axis. In this way, by controlling the ratio of the total thickness of all lenses of the optical lens to the sum of the thicknesses of the fourth lens and the fifth lens, the thicknesses of the fourth lens and the fifth lens can be reasonably controlled, which is beneficial to the processing and assembly of the fourth lens and the fifth lens while realizing the miniaturization design of the optical lens 100.

[0078] In some embodiments, the optical lens 100 satisfies the following relational expression: 1<CT1 / CT2<2.6, where 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 lens 100 is realized, and at the same time, it is beneficial to reduce the sensitivity of the optical lens 100. In addition, satisfying this relationship can also enhance the environmental resistance of the first lens L1.

[0079] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.4<CT3 / CT4<4.5. When this relational expression is satisfied, the ratio of the thicknesses of the third lens and the fourth lens L4 can be effectively controlled, the miniaturization design of the optical lens 100 is realized, and at the same time, it is beneficial to reduce the sensitivity of the optical lens 100.

[0080] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.2<CT3 / (CT1+CT2+CT4+CT5)<1.1. When this relational expression is satisfied, the thickness of each lens can be reasonably configured, preventing the optical lens from having compromised structural strength due to excessively thin lenses, and meanwhile avoiding adverse effects on the processing yield of each lens.

[0081] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.2<f1 / fi<2, where f1 is the focal length of the first lens L1, and fi is the focal length of the optical lens 100 in the telefocus state. By controlling the ratio of the focal length of the first lens L1 to the maximum focal length of the optical lens 100 in the telefocus state, reasonable refractive power distribution can be achieved for the first lens L1, which helps to reduce the total spherical aberration, chromatic aberration and distortion of the first lens group to a reasonable level, lowers the design difficulty of the subsequent lenses, improves the overall resolving power of the optical lens 100, and enhances the peripheral aberration correction of the optical lens 100. In addition, it is beneficial to the size reduction of the first lens group, thus contributing to the formation of the compact-sized optical lens 100.

[0082] In some embodiments, the optical lens 100 satisfies the following relational expression: -1.1<f2 / fi<-0.5, 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 lens 100 in the telefocus state, the second lens L2 can be provided with reasonable refractive power, which helps to reduce the total spherical aberration, chromatic aberration and distortion of the second lens L2 to a reasonable level, lowers the design difficulty of the subsequent lenses, improves the overall resolving power of the optical lens 100, and enhances the peripheral aberration correction of the optical lens 100. In addition, it is beneficial to the size reduction of the second lens L2, thus contributing to the formation of the compact-sized optical lens 100.

[0083] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.3<f3 / fi<0.7, 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 lens 100 in the telefocus state, the third lens L3 can be provided with reasonable refractive power, which helps to reduce the total spherical aberration, chromatic aberration and distortion of the third lens L3 to a reasonable level, lowers the design difficulty of the subsequent lenses, improves the overall resolving power of the optical lens 100, and enhances the peripheral aberration correction of the optical lens 100. In addition, it is beneficial to the size reduction of the third lens L3, thus contributing to the formation of the compact-sized optical lens 100.

[0084] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.75<|f4| / fi, 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 lens 100 in the telephoto state, the fourth lens L4 can have reasonable refractive power, which helps to reduce the combined spherical aberration, chromatic aberration and distortion of the second lens group G2 to a reasonable level, reduces the design difficulty of the subsequent lenses, meanwhile improves the overall resolving power of the optical lens 100, and enhances the peripheral aberration correction of the optical lens 100. In addition, it is beneficial to the size compression of the second lens group G2, thereby contributing to the formation of the optical lens 100 with a small size.

[0085] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.7<f5 / fi, 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 lens 100 in the telephoto state, the fifth lens L5 can have reasonable refractive power, which helps to reduce the combined spherical aberration, chromatic aberration and distortion of the second lens group to a reasonable level, reduces the design difficulty of the subsequent lenses, meanwhile improves the overall resolving power of the optical lens 100, and enhances the peripheral aberration correction of the optical lens 100. In addition, it is beneficial to the size compression of the second lens group, thereby contributing to the formation of the optical lens 100 with a small size.

[0086] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.6<fG2 / fi<5.4, where fG2 is the combined focal length of the second lens group G2, and fi is the focal length of the optical lens 100 in the telephoto state. When this relational expression is satisfied, the relationship between the combined focal length of the second lens group G2 and the maximum focal length of the optical lens in the telephoto state can be reasonably balanced, the total optical length of the optical lens can be effectively shortened, and excessive increase of high-order spherical aberration can be avoided at the same time, so as to achieve the improvement of imaging quality.

[0087] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.9<fi / R1<1.5; where R1 is the radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the first lens L1 can be reduced, so as to effectively suppress the increase of field curvature and distortion, and reduce the molding difficulty of the first lens L1 at the same time.

[0088] In some embodiments, the optical lens 100 satisfies the following relational expression: 3.3<fi / R3<4.9, where R3 is the radius of curvature of the object-side surface S3 of the second lens L2 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the second lens L2 can be reduced, so as to effectively suppress the increase of field curvature and distortion, and reduce the molding difficulty of the second lens L2 at the same time.

[0089] In some embodiments, the optical lens 100 satisfies the following relational expression: 5.1<fi / R4<8, where R4 is the radius of curvature of the image side surface S4 of the second lens L2 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the second lens L2 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and simultaneously lowering the molding difficulty of the second lens L2.

[0090] In some embodiments, the optical lens 100 satisfies the following relational expression: 3.1<fi / R5<5.8, where R5 is the radius of curvature of the object side surface of the third lens L3 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the third lens L3 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and simultaneously lowering the molding difficulty of the third lens L3.

[0091] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.9<fi / |R6|<3.2, where R6 is the radius of curvature of the image side surface of the third lens L3 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the third lens L3 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and simultaneously lowering the molding difficulty of the third lens L3.

[0092] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.9<fi / |R7|<5, where R7 is the radius of curvature of the object side surface S7 of the fourth lens L4 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the fourth lens L4 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and simultaneously lowering the molding difficulty of the fourth lens L4.

[0093] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.6<fi / |R8|<5.9, where R8 is the radius of curvature of the image side surface S8 of the fourth lens L4 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the fourth lens L4 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and simultaneously lowering the molding difficulty of the fourth lens L4.

[0094] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.6<fi / |R9|<4.9, where R9 is the radius of curvature of the object side surface S9 of the fifth lens L5 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface profile complexity of the fifth lens L5 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and simultaneously lowering the molding difficulty of the fifth lens L5.

[0095] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.3<fi / |R10|<5.3, where R10 is the radius of curvature of the image side S10 of the fifth lens L5 at the optical axis. When the optical lens 100 satisfies this relational expression, the surface shape complexity of the fifth lens L5 can be reduced, thereby effectively suppressing the increase of field curvature and distortion, and reducing the molding difficulty of the fifth lens L5 at the same time.

[0096] In some embodiments, the optical lens 100 satisfies the relational expression: 1.1mm<Bz1-Bz2<3.8mm. Wherein, Bz1 is the distance on the optical axis from the light exit surface of the reflecting element LP to the object side of the second lens L2 when the optical lens 100 is in the far focus state, and Bz2 is the distance on the optical axis from the light exit surface of the reflecting element LP to the object side of the second lens L2 when the optical lens 100 is in the near focus state. When the optical lens 100 satisfies this relational expression, considering the assembly of the reflecting element LP and the temperature drift of the optical lens 100, the distance between the light exit surface of the reflecting element LP and the second lens group G2 under different object distances is reasonably configured, which can ensure a safe distance between the reflecting element LP and the second lens group G2 and avoid interference. Through the movement of the second lens group G2, under the condition of correcting the image quality performance of different object distances, the overall height of the optical lens 100 is kept unchanged, so as to realize the inner focusing function. At the same time, the movement amount of the second lens group G2 from far focus to near focus reduces the movement stroke and ensures the driving capacity of the motor movement.

[0097] In some embodiments, the optical lens 100 satisfies the relational expression: 2.7mm<Bz1<5mm. When the optical lens 100 satisfies this relational expression, there is sufficient moving space between the reflecting element LP and the object side of the second lens L2, so that interference between the two can be avoided.

[0098] In some embodiments, the optical lens 100 satisfies the relational expression: 0.8mm<Bz2<1.8mm. When the optical lens 100 satisfies this relational expression, there is sufficient moving space between the reflecting element LP and the object side of the second lens L2, so that interference between the two can be avoided.

[0099] In some embodiments, the optical lens 100 satisfies the relational expression: 1.7<CT_P / CT3<5.3. Wherein, CT_P is the length of the reflecting element LP in the optical axis direction, and CT3 is the thickness of the third lens L3 on the optical axis. When this relational expression is satisfied, the ratio of the length of the reflecting element LP to the thickness of the third lens L3 is appropriate, which not only meets the miniaturization design of the optical lens 100, but also ensures that the light has a sufficient reflection path in the reflecting element LP.

[0100] The optical lens 100 of this embodiment will be described in detail below with reference to specific parameters.

[0101] Embodiment 1

[0102] A schematic diagram of the structure of the optical lens 100 disclosed in the first embodiment of this application is shown below. Figure 1A , Figure 1C , Figure 2A , Figure 2C As shown, the optical lens 100 includes an aperture stop STO, a first lens L1, a reflector LP, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter IR, arranged sequentially along the optical axis from the object side to the image side. The first lens L1 forms a first lens group G1, and the second lens L2, third lens L3, fourth lens L4, and fifth lens L5 form a second lens group G2.

[0103] It is understood that in the first embodiment Figure 1C , Figure 2C The optical path diagram of the optical lens 100 is shown. The optical path diagrams of other embodiments can be referred to the first embodiment, so the optical path diagrams of other embodiments are not shown for the time being.

[0104] It is understood that the reflector LP can be a prism or a mirror. This embodiment and the following embodiments will be described using a prism as an example.

[0105] In this embodiment, the object-side surface S1 and image-side surface S2 of the first lens L1 are convex and flat near the optical axis, respectively; the object-side surface S3 and image-side surface S4 of the second lens L2 are convex and concave near the optical axis, respectively; the object-side surface S5 and image-side surface S6 of the third lens L3 are convex and concave near the optical axis, respectively; the object-side surface S7 and image-side surface S8 of the fourth lens L4 are concave and convex near the optical axis, respectively; and the object-side surface S9 and image-side surface S10 of the fifth lens L5 are convex and concave near the optical axis, respectively.

[0106] Specifically, the parameters of the optical lens 100 are given in Table 1 below. The elements along the optical axis of the optical lens 100, from the object side to the image side, are arranged sequentially from top to bottom according to Table 1. In the same lens, the surface with the smaller surface number is the object-side surface of the lens, and the surface with the larger surface number is the image-side surface of the lens. For example, surface numbers 1 and 2 correspond to the object-side surface S1 and the image-side surface of the first lens L1, respectively. The Y-radius in Table 1 is the radius of curvature of the corresponding object-side or image-side surface at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens along the optical axis, and the second value is the distance from the image-side surface of the lens to the next surface along the optical axis. The value of the aperture stop STO in the "Thickness" parameter column represents the distance on the optical axis from the aperture stop STO to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis). By default, the direction from the object side of the first lens L1 to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture stop STO is set on the image side of the vertex of the next surface. If the thickness of the aperture stop STO is positive, the aperture stop STO is on the object side of the vertex of the next surface. It can be understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. Moreover, the refractive index, Abbe number, etc. in Table 1 are all 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 lens 100 of this application can achieve internal focusing, it has a telephoto state and a near-focus state. Therefore, the object distance A is different in the telephoto state and the near-focus state. At the same time, the air gap (i.e., B in Table 1 below) between the reflector LP and the second lens L2 in the optical axis direction is different in the telephoto state and the near-focus state. As mentioned above, the filter IR can move along the optical axis following the second lens group G2. Based on this, the distance between the filter IR and the imaging surface IMG of the optical lens 100 (i.e., C in Table 1 below) is different in the telephoto and near-focus states.

[0107] Based on this, Table 2 was compiled. Table 2 gives the values ​​of A, B, C, f, FNO, FOV, TTL, and ImgH in both telephoto and telephoto states. Except for FOV, which is in deg and FNO, which has no unit, the units of the other parameters in Table 2 are mm.

[0108] In addition, in Tables 1 and 3 below, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively; surface numbers 3 and 4 correspond to the object side S3 and image side S4 of the second lens L2, respectively; and so on. Surface numbers 9 and 10 correspond to the object side S9 and image side S10 of the fifth lens L5, respectively.

[0109] In the first embodiment, the object-side surface of the first lens L1 is aspherical, and the image-side surface of the first lens L1 can be spherical. The object-side surface and image-side surface of any one of the first lens L1 to the fifth lens L5 are both aspherical. The surface shape x of each aspherical lens can be limited by, but is not limited to, the following aspherical formula:

[0110]

[0111] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the curvature of the aspherical surface at the optical axis, c = 1 / Y (i.e., the paraxial curvature c is the reciprocal of the radius of curvature Y in Table 1 below); K is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 3 below gives the higher-order coefficients A4, A6, A8, A10, and A12 that can be used for surfaces 5-16 in the first embodiment.

[0112] Of course, as another example, the image-side surface of the first lens can also be aspherical. The light-incident surface and light-exit surface of the reflector LP can be spherical or aspherical. This embodiment is illustrated by taking the image-side surface of the first lens as spherical and the light-incident surface and light-exit surface of the reflector LP as spherical.

[0113] It is understood that the material of the first lens can be either plastic or glass. Of course, the material of the reflector can also be either glass or plastic. This embodiment does not specifically limit the specific materials.

[0114] Table 1

[0115]

[0116] Table 2

[0117] parameter A B C FNO FOV f TTL ImgH telephoto mode unlimited 4.516 4.665 2.52 22.6 21.57 30 4.36 Close-focus state 300.00 1.430 7.752 2.47 21.1 21.13 30 4.36

[0118] Table 3

[0119]

[0120]

[0121] Please see Figure 1B , Figure 2B (A) in the middle Figure 1B , Figure 2B (A) shows the longitudinal spherical aberration curves of the optical lens 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), the horizontal coordinate along the X-axis represents the focus shift, and the vertical coordinate along the Y-axis represents the normalized field of view. Figure 1B , Figure 2B As can be seen from (A) in the first embodiment, the spherical aberration value of the optical lens 100 is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0122] Please see Figure 1B , Figure 2B (B) in the middle Figure 1B , Figure 2B (B) in the figure shows the light astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 555 nm. The horizontal axis along the X-axis represents the focus shift, and the vertical axis along the Y-axis represents the image height, 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 lens 100 is well compensated at this wavelength.

[0123] 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 lens 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 1B , Figure 2B As can be seen from (C), the distortion of the optical lens 100 is well corrected at this wavelength.

[0124] Example 2

[0125] like Figure 3A , Figure 4A As shown, in this embodiment, the refractive power of the first lens L1 to the fifth lens L5 is the same as that of the first embodiment. In the surface design of the first lens L1 to the fifth lens L5, except that the image side of the third lens L3 is convex, the surface design of the other lenses is also the same as that of the first embodiment, which will not be described in detail here.

[0126] Specifically, the parameters of the optical lens 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 lens in both telephoto and near-photo states. Table 6 below gives the higher-order coefficients that can be used for each aspherical lens in the second embodiment.

[0127] Table 4

[0128]

[0129]

[0130] Table 5

[0131] parameter A B C FNO FOV f TTL ImgH telephoto mode unlimited 4.423 5.095 2.52 22.5 21.57 30.4 4.36 Close-focus state 300.00 0.900 8.618 2.47 21.3 20.94 30.4 4.36

[0132] Table 6

[0133]

[0134] 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 lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 3B , Figure 4B (A) Figure 3B , Figure 4B (B) and Figure 3B , Figure 4B 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 1B , Figure 2B The content described in (C) will not be repeated here.

[0135] 3rd Embodiment

[0136] like Figure 5A , Figure 6A As shown, in this embodiment, the refractive power of the first lens L1 to the fifth lens L5 is the same as that of the first embodiment, and the surface design of the first lens L1 to the fifth lens L5 is the same as that of the first embodiment, which will not be described in detail here.

[0137] Specifically, the parameters of the optical lens 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 lens 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.

[0138] Table 7

[0139]

[0140]

[0141] Table 8

[0142] parameter A B C FNO FOV f TTL ImgH telephoto mode unlimited 4.800 4.858 2.52 22.5 21.57 30.4 4.36 Close-focus state 300.00 1.679 7.979 2.45 21.3 21 30.4 4.36

[0143] Table 9

[0144]

[0145] Please see Figure 5B , Figure 6B , Figure 5B , Figure 6B 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 lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 5B , Figure 6B (A) Figure 5B , Figure 6B (B) and Figure 5B , Figure 6B 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 1B , Figure 2B The content described in (C) will not be repeated here.

[0146] Example 4

[0147] like Figure 7A , Figure 8A As shown, in this embodiment, the refractive power of the first lens L1 to the fifth lens L5 is the same as that of the first embodiment. In the surface design of the first lens L1 to the fifth lens L5, except that the image side of the first lens is concave, the surface design of the other lenses is also the same as that of the first embodiment, which will not be described in detail here.

[0148] Specifically, the parameters of the optical lens 100 are given in Table 10 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Correspondingly, Table 11 gives the values ​​of each parameter of the optical lens in both telephoto and near-focus states. Table 12 gives the higher-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical lenses in the fourth embodiment.

[0149] Table 10

[0150]

[0151]

[0152] Table 11

[0153] parameter A B C FNO FOV f TTL ImgH telephoto mode unlimited 4.828 5.380 2.52 22.4 21.71 29.964 4.36 Close-focus state 300.00 1.428 8.780 2.63 21.2 21.14 29.964 4.36

[0154] Table 12

[0155]

[0156] Please see Figure 7B , Figure 8B ,Depend on Figure 7B , Figure 8B 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 lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 7B , Figure 8B (A) Figure 7B , Figure 8B (B) and Figure 7B , Figure 8B 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 1B , Figure 2B The content described in (C) will not be repeated here.

[0157] Example 5

[0158] like Figure 9A , Figure 10A As shown, in this embodiment, the refractive power of the first lens L1 to the third lens L3 is the same as in the first embodiment, but the fourth lens L4 has negative refractive power and the fifth lens L5 has positive refractive power. The surface design of the first lens L1 to the third lens L3 is also the same as in the first embodiment. However, the object side and image side of the fourth lens L4 are convex and concave near the optical axis, respectively, and the object side and image side of the fifth lens L5 are concave and convex near the optical axis, respectively.

[0159] Specifically, the parameters of the optical lens 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 lens in both telephoto and near-photo states. Table 15 gives the higher-order coefficients K, A4, A6, A8, A10, and A12 that can be used for each aspherical lens in the fifth embodiment.

[0160] Table 13

[0161]

[0162] Table 14

[0163] parameter A B C FNO FOV f TTL ImgH telephoto mode unlimited 4.196 4.290 2.3 24.2 20 28 4.36 Close-focus state 300.00 1.430 7.056 2.27 23 19.38 28 4.36

[0164] Table 15

[0165]

[0166] Please see Figure 9B , Figure 10B ,Depend on Figure 9B , Figure 10B 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 lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 9B , Figure 10B (A) Figure 9B , Figure 10B (B) and Figure 9B , Figure 10B 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 1B , Figure 2B The content described in (C) will not be repeated here.

[0167] Example 6

[0168] like Figure 11A , Figure 12A As shown, in this embodiment, the refractive power of the first lens L1 to the fifth lens L5 is the same as that of the fifth embodiment, and the surface design of the first lens L1 to the fifth lens L5 is also the same as that of the fifth embodiment, which will not be described in detail here.

[0169] Specifically, the parameters of the optical lens 100 are given in Table 16 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Correspondingly, Table 17 gives the values ​​of each parameter of the optical lens in both telephoto and near-photo states. Table 18 gives the higher-order coefficients K, A4, A6, A8, A10, and A12 that can be used for each aspherical lens in the sixth embodiment.

[0170] Table 16

[0171]

[0172] Table 17

[0173] parameter A B C FNO FOV f TTL ImgH telephoto mode unlimited 4.204 4.615 2.57 22.5 21.57 29.2 4.36 Close-focus state 300.00 1.430 7.389 2.27 20.9 21.23 29.2 4.36

[0174] Table 18

[0175]

[0176]

[0177] Please see Figure 11B , Figure 12B ,Depend on Figure 11B , Figure 12B 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 lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 11B , Figure 12B (A) Figure 11B , Figure 12B (B) and Figure 11B , Figure 12B 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 1B , Figure 2B The content described in (C) will not be repeated here.

[0178] Example 7

[0179] like Figure 13A , Figure 14A As shown, in this embodiment, the refractive power of the first lens L1 to the fifth lens L5 is the same as that of the fifth embodiment, and the surface design of the first lens L1 to the fifth lens L5 is also the same as that of the fifth embodiment, which will not be described in detail here.

[0180] Specifically, the parameters of the optical lens 100 are given in Table 19 below. The definitions of each parameter can be derived from the description of the foregoing embodiments and will not be repeated here. Correspondingly, Table 20 gives the values ​​of each parameter of the optical lens in both telephoto and near-photo states. Table 21 gives the higher-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical lenses in the 7th embodiment.

[0181] Table 19

[0182]

[0183] Table 20

[0184] parameter A B C FNO FOV f TTL ImgH telephoto mode unlimited 2.862 4.300 2.3 26.7 18 28.78 4.36 Close-focus state 300.00 1.430 5.732 2.3 25.7 17.57 28.78 4.36

[0185] Table 21

[0186]

[0187]

[0188] Please see Figure 13B , Figure 14B ,Depend on Figure 13B , Figure 14B 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 lens 100 are all well controlled, thus the optical lens 100 of this embodiment has good imaging quality. Furthermore, regarding... Figure 13B , Figure 14B (A) Figure 13B , Figure 14B (B) and Figure 13B , Figure 14B 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 1B , Figure 2B The content described in (C) will not be repeated here.

[0189] Refer to Table 22, which summarizes the ratios of the relationships in embodiments 1 to 7 of this application.

[0190] Table 22

[0191]

[0192]

[0193] Please see Figure 15 This application also discloses a camera module 200, which includes an image sensor 201 and an optical lens 100 as described in any of the embodiments of the first aspect to the eighth embodiment above. The image sensor 201 is disposed on the image side of the optical lens 100. The optical lens 100 is used to receive the light signal of the subject and project it onto the image sensor 201. The image sensor 201 is used to convert the light signal corresponding to the subject into an image signal, which will not be elaborated here. It can be understood that the camera module 200 with the above-described optical lens 100 has all the technical effects of the above-described optical lens 100, and can achieve miniaturization and thinness while having the characteristics of a large image area. Since the above-described technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0194] Please see Figure 16This application also discloses an electronic device 300, which includes a housing 301 and the aforementioned camera module 200, with the camera module 200 disposed within the housing. Specifically, the camera module 200 can be disposed inside the housing 301 or on the housing 301. The electronic device 300 can be, but is not limited to, a mobile phone, tablet computer, laptop computer, smartwatch, monitor, etc. It is understood that the electronic device 300 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical lens 100. That is, it can achieve miniaturization and thinness while having a large image area, which is beneficial for improving image quality. Since the aforementioned technical effects have been described in detail in the embodiments of the optical lens 100, they will not be repeated here.

[0195] The optical lens, camera module, and electronic device disclosed in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the optical lens, camera module, and electronic device of this application and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An optical lens, characterized in that, There are five lenses with refractive power, which are sequentially arranged from the object side to the image side along the optical axis, including: a first lens group, wherein the first lens group comprises a first lens; the first lens has positive refractive power, and the object side surface of the first lens is a convex surface at a position near the optical axis; a second lens group, wherein the second lens group comprises a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from the object side to the image side along the optical axis; the second lens has negative refractive power, the object side surface of the second lens is a convex surface at a position near the optical axis, and the image side surface of the second lens is a concave surface at a position near the optical axis; the third lens has positive refractive power, and the object side surface of the third lens is a convex surface at a position near the optical axis; the fourth lens has refractive power; the fifth lens has refractive power; wherein the first lens group is fixed relative to the image plane of the optical lens, and the second lens group moves along the optical axis direction between the first lens group and the image plane of the optical lens, so that the optical lens switches between a near-focus state and a far-focus state; the optical lens satisfies the following relational expressions: 18deg<FOV<28deg, and, 2.1<FNO<2.8; FOV is the maximum field angle of the optical lens, and FNO is the f-number of the optical lens.

2. The optical lens according to claim 1, characterized in that, the optical lens satisfies the following relational expressions: 1.2<f1 / fi<2, and / or, -1.1<f2 / fi<-0.5, and / or, 0.3<f3 / fi<0.7, and / or, 0.75<|f4| / fi, and / or, 0.7<f5 / fi, and / or, 1.6<fG2 / fi<5.4; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, fi is the focal length of the optical lens in the far-focus state, and fG2 is the combined focal length of the second lens group, fi is the focal length of the optical lens in the far-focus state.

3. The optical lens according to claim 1, characterized in that, the optical lens satisfies the following relational expressions: 0.9<fi / R1<1.5, and / or, 3.3<fi / R3<4.9, and / or, 5.1<fi / R4<8, and / or, 3.1<fi / R5<5.8, and / or, 0.9<fi / |R6|<3.2, and / or, 0.9<fi / |R7|<5, and / or, 0.6<fi / |R8|<5.9, and / or, 0.6<fi / |R9|<4.9, and / or, 1.3<fi / |R10|<5.3; wherein R1 is a curvature radius of an object-side surface of the first lens at an optical axis, R3 is a curvature radius of an object-side surface of the second lens at the optical axis, R4 is a curvature radius of an image-side surface of the second lens at the optical axis, R5 is a curvature radius of an object-side surface of the third lens at the optical axis, R6 is a curvature radius of an image-side surface of the third lens at the optical axis, R7 is a curvature radius of an object-side surface of the fourth lens at the optical axis, R8 is a curvature radius of an image-side surface of the fourth lens at the optical axis, R9 is a curvature radius of an object-side surface of the fifth lens at the optical axis, R10 is a curvature radius of an image-side surface of the fifth lens at the optical axis, and fi is a focal length of the optical lens assembly at a far-focus state.

4. The optical lens according to claim 1, characterized in that, The optical lens assembly satisfies the following relational expression: 6.1<TTL / ImgH<7.2, and / or, 3.85<43.27*fi / (2*ImgH*23)<4.7, and / or, 3.5<fi / BFL1<4.1; wherein TTL is a distance on the optical axis from the object-side surface of the first lens to an image plane of the optical lens assembly, ImgH is a half of an image height corresponding to a maximum field of view of the optical lens assembly, fi is the focal length of the optical lens assembly at the far-focus state, and BFL1 is a distance on the optical axis from the image-side surface of the fifth lens to the image plane of the optical lens assembly when the optical lens assembly is at the far-focus state.

5. The optical lens according to claim 1, characterized in that, The optical lens assembly further comprises a reflecting element, the reflecting element has a light incident surface, a reflecting surface and a light exit surface, the first lens group is located on a side where the light incident surface of the reflecting element is disposed, the second lens group is located on a side where the light exit surface of the reflecting element is disposed, the reflecting element is fixed relative to the image plane of the optical lens assembly, imaging light sequentially passes through the first lens group, transmits through the light incident surface into the reflecting element, is reflected by the first reflecting surface to the light exit surface, and transmits through the light exit surface to the second lens group; The optical lens assembly satisfies the following relational expression: 1.1mm<Bz1-Bz2<3.8mm, and / or, 2.7mm<Bz1<5mm, and / or, 0.8mm<Bz2<1.8mm, and / or, 1.7<CT_P / CT3<5.3; wherein Bz1 is a distance on the optical axis from the light exit surface of the reflecting element to the object-side surface of the second lens when the optical lens assembly is at the far-focus state, Bz2 is a distance on the optical axis from the light exit surface of the reflecting element to the object-side surface of the second lens when the optical lens assembly is at a near-focus state, CT_P is a length of the reflecting element in an optical axis direction, and CT3 is a thickness of the third lens on the optical axis.

6. The optical lens according to claim 1, characterized in that, The optical lens assembly satisfies the following relational expression: 0.6<SD3 / SD1<1, and / or, 0.8<CT2 / SAG21<2.7, and / or, 0.5<CT2 / SAG22<1.3; wherein SD1 is the maximum effective half-aperture of the object-side surface of the first lens, SD3 is the maximum effective half-aperture of the object-side surface of the second lens, CT2 is the thickness of the second lens on the optical axis, SAG21 is the distance in the optical axis direction from the maximum effective half-aperture of the object-side surface of the second lens to the intersection point of the object-side surface of the second lens and the optical axis, and SAG22 is the distance in the optical axis direction from the maximum effective half-aperture of the image-side surface of the second lens to the intersection point of the image-side surface of the second lens and the optical axis.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following relational expressions: 1.1<CT3 / CT2<8, and / or, 0.9<CT4 / CT5<3.7, and / or, 1.5<ΣCT / CT23<3, and / or, 1.8<ΣCT / CT45<4.5, and / or, 1<CT1 / CT2<2.6, and / or, 0.4<CT3 / CT4<4.5, and / or, 0.2<CT3 / (CT1+CT2+CT4+CT5)<1.1; wherein CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fifth lens on the optical axis, ΣCT is the sum of the thicknesses of the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis, CT1 is the thickness of the first lens on the optical axis, CT23 is the sum of the thicknesses of the second lens and the third lens on the optical axis, and CT45 is the sum of the thicknesses of the fourth lens and the fifth lens on the optical axis.

8. The optical lens according to claim 1, characterized in that, The optical lens further comprises a filter, the filter is located between the image-side surface of the fifth lens and the imaging surface of the optical lens in the optical axis direction, and when the second lens group moves relative to the first lens group along the optical axis direction, the filter moves relative to the first lens group following the second lens group.

9. A camera module, characterized in that, The camera module comprises an image sensor and the optical lens as described in any one of claims 1 to 8, and the image sensor is arranged on the image side of the optical lens.

10. An electronic device, characterized in that, The electronic device comprises a housing and the camera module as described in claim 9, and the camera module is arranged on the housing.

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