Optical lens, camera module and electronic device

Abstract

The invention discloses an optical lens, a camera module and an electronic device, and the optical lens comprises four lenses with refractive power, and comprises a first lens, a second lens, a third lens and a fourth lens which are sequentially arranged from an object side to an image side along an optical axis; the first lens and the second lens form a first lens group, the third lens and the fourth lens form a second lens group, the first lens group is fixed relative to an imaging surface of the optical lens, and the second lens group moves between the first lens group and the imaging surface of the optical lens along the optical axis direction; the first lens element with positive refractive power has an object-side surface and an image-side surface being convex in a paraxial region. The second lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof. The third lens element with refractive power has an object-side surface being concave in a paraxial region and an image-side surface being convex in a paraxial region. The fourth lens element has negative refractive power. According to the optical lens, the focusing function of the optical lens can be realized while the miniaturization design of the optical lens is met, and the imaging quality can be ensured.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and particularly to an optical lens, a camera module, and an electronic device. Background Art

[0002] With the development of optical imaging technology, optical lenses are widely used in mobile electronic devices. At the same time, as mobile electronic devices show a trend of miniaturization and thinness, people's requirements for the miniaturized design of optical lenses are also getting higher and higher. However, when the size of the electronic device becomes smaller, the imaging quality of the optical lens cannot be guaranteed. Summary of the Invention

[0003] In view of the above, it is necessary to provide an optical lens, a camera module, and an electronic device to ensure the imaging quality while meeting the miniaturized design.

[0004] In the first aspect of the embodiments of this application, an optical lens is provided, which has a total of four lenses with refractive power, including a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side along the optical axis; the first lens and the second lens form a first lens group, the third lens and the fourth lens form a second lens group, the first lens group is fixed relative to the imaging surface of the optical lens, and the second lens group moves along the optical axis direction between the first lens group and the imaging surface of the optical lens; the first lens has a positive refractive power, and its object side and image side are convex surfaces near the optical axis; the second lens has a negative refractive power, and its object side is a concave surface near the optical axis; the third lens has a refractive power, its object side is a concave surface near the optical axis, and its image side is a convex surface near the optical axis; the fourth lens has a negative refractive power; the optical lens satisfies the following relational expressions: 17° < FOV < 24°; 2.5 < FNO < 3.2; where, FOV is the maximum field of view angle of the optical lens, and FNO is the f-number of the optical lens.

[0005] For the above optical lens, by setting the first lens to have a positive refractive power, and its object side and image side are convex surfaces near the optical axis, it is beneficial to the incidence and convergence of light rays in a large field of view range; the second lens has a negative refractive power, and its object side is a concave surface near the optical axis, which helps to correct the aberration generated by the front lens; the third lens has a refractive power, its object side is a concave surface near the optical axis, and its image side is a convex surface near the optical axis, which is beneficial to delaying the light rays incident from the front-end lens into the lens and reducing the deflection angle of the light rays incident from the front-end lens; the fourth lens has a negative refractive power, which is beneficial to correcting the spherical aberration, coma, and distortion generated by the front lens group. By setting the second lens group that can move along the optical axis direction between the first lens group and the imaging surface of the optical lens, the focusing clarity of the optical lens can be adjusted, so that the total length of the optical lens remains unchanged during the focusing process, thereby realizing the focusing function of the optical lens while meeting the miniaturized design of the optical lens.

[0006] Further, by making the optical lens satisfy 17° < FOV < 24°, the optical lens can have a telephoto characteristic, so that the optical lens has the characteristics of high pixels and high definition, ensuring the imaging quality. By making the optical lens satisfy 2.5 < FNO < 3.2, it can ensure that the optical lens has the characteristic of a large aperture, allowing the optical lens to have sufficient light input, making the captured image clearer, and realizing the capture of object space scenes with low light brightness such as high-quality night scenes and starry skies.

[0007] The second aspect of the embodiment of the present application provides an imaging module, including: the optical lens as described above; and an image sensor disposed on the image side of the optical lens.

[0008] The above-mentioned imaging module includes the above-mentioned optical lens, which can realize the focusing function of the optical lens while meeting the miniaturization design of the optical lens, and the imaging quality can be guaranteed.

[0009] The third aspect of the embodiment of the present application provides an electronic device, including: a housing; and the above-mentioned imaging module, and the imaging module is installed on the housing.

[0010] The above-mentioned electronic device includes the above-mentioned optical lens, which can realize the focusing function of the optical lens while meeting the miniaturization design of the optical lens, and the imaging quality can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 is a schematic structural diagram of the optical lens in the telephoto state of the first embodiment of the present application.

[0012] Figure 2 is the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical lens in the telephoto state of the first embodiment of the present application.

[0013] Figure 3 is a schematic structural diagram of the optical lens in the near-focus state of the first embodiment of the present application.

[0014] Figure 4 is the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical lens in the near-focus state of the first embodiment of the present application.

[0015] Figure 5 is a schematic structural diagram of the optical lens in the telephoto state of the second embodiment of the present application.

[0016] Figure 6 is the longitudinal spherical aberration curve graph, astigmatism curve graph and distortion curve graph of the optical lens in the telephoto state of the second embodiment of the present application.

[0017] Figure 72 is a schematic structural diagram of the optical lens in the third embodiment of the present application in a far-focus state.

[0018] Figure 8 1 is a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the optical lens of the third embodiment of the present application in the far focus state.

[0019] Figure 9 2 is a schematic structural diagram of the optical lens in the fourth embodiment of the present application in a far-focus state.

[0020] Figure 10 1 and 2 are longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical lens of the fourth embodiment of the present application in the far focus state.

[0021] Figure 11 2 is a schematic structural diagram of the optical lens in the fifth embodiment of the present application in a far-focus state.

[0022] Figure 12 1 and 2 are longitudinal spherical aberration curves, astigmatism curves, and distortion curves of the optical lens of the fifth embodiment of the present application in the far focus state.

[0023] Figure 13 It is a structural diagram of the camera module of an embodiment of the present application.

[0024] Figure 14 Schematic diagram of the structure of the electronic device according to an embodiment of the present application.

[0025] Description of the main component symbols: optical lens 100, first lens L1, second lens L2, third lens L3, fourth lens L4, object-side surfaces S1, S3, S5, S7, image-side surfaces S2, S4, S6, S8, first lens group G1, second lens group G2, aperture STO, filter IR, imaging surface IMG, camera module 200, image sensor 201, electronic device 300, housing 301. DETAILED DESCRIPTION

[0026] The embodiments of the present application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0027] See also Figure 1 In a first aspect of an embodiment of the present application, an optical lens 100 is provided, which has a total of four lenses with refractive power, including a first lens L1, a second lens L2, a third lens L3 and a fourth lens L4 arranged in sequence from the object side to the image side along the optical axis.

[0028] The first lens L1 and the second lens L2 form the first lens group G1, the third lens L3 and the fourth lens L4 form the second lens group G2. The first lens group G1 is fixed relative to the imaging surface IMG of the optical lens 100, and the second lens group G2 moves along the optical axis direction between the first lens group G1 and the imaging surface IMG of the optical lens 100;

[0029] The first lens L1 has a positive refractive power, and its object side surface S1 and image side surface S2 are both convex surfaces near the optical axis. The second lens L2 has a negative refractive power, and its object side surface S3 is a concave surface near the optical axis. The third lens L3 has a refractive power, its object side surface S5 is a concave surface near the optical axis, and its image side surface S6 is a convex surface near the optical axis. The fourth lens L4 has a negative refractive power.

[0030] By setting the first lens L1 to have a positive refractive power, with its object side surface S1 and image side surface S2 both being convex surfaces near the paraxial region, it is beneficial for the incidence and convergence of light rays within a large field of view; the second lens L2 has a negative refractive power, with its object side surface S3 being a concave surface near the paraxial region and its image side surface S4 being a convex surface near the paraxial region, which helps to correct the aberration generated by the front lens; the third lens L3 has a refractive power, with its object side surface S5 being a concave surface near the paraxial region and its image side surface S6 being a convex surface near the paraxial region, which is beneficial for delaying the light rays incident from the front-end lens into the lens and can reduce the deflection angle of the light rays incident from the front-end lens; the fourth lens L4 has a negative refractive power, which is beneficial for correcting the spherical aberration, coma, and distortion generated by the front lens group. By setting the second lens group G2 that can move along the optical axis direction between the first lens group G1 and the imaging surface IMG of the optical lens 100, the focusing clarity of the optical lens 100 can be adjusted, such that the total length of the optical lens 100 remains unchanged during the focusing process, thereby achieving the focusing function of the optical lens 100 while meeting the miniaturization design of the optical lens 100.

[0031] Furthermore, the optical lens 100 satisfies the following relationship: 17° < FOV < 24°; for example, FOV is 17.1°, 17.8°, 18°, 18.5°, 19°, 21°, 23.9°, etc. Here, FOV is the maximum field of view angle of the optical lens 100. By making the optical lens 100 satisfy the above relationship, the optical lens 100 can have a telephoto characteristic, thereby enabling the optical lens 100 to have the characteristics of high pixels and high clarity, ensuring the imaging quality.

[0032] Meanwhile, the optical lens 100 satisfies the following relationship: 2.5 < FNO < 3.2; for example, FNO is 2.51, 2.6, 2.7, 2.8, 2.9, 3, 3.15, 3.19, etc. Here, FNO is the aperture number of the optical lens 100. By making the optical lens 100 satisfy the above relationship, it can be ensured that the optical lens 100 has the characteristic of a large aperture, allowing the optical lens 100 to have sufficient light input, making the captured image clearer, and realizing the shooting of object space scenes with low light brightness such as high-quality night scenes and starry skies.

[0033] In some embodiments, the optical lens 100 satisfies the following relationship: 2.4 < fz1 / f1 < 2.9; for example, fz1 / f1 is 2.41, 2.5, 2.55, 2.6, 2.65, 2.7, 2.8, 2.89, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and f1 is the effective focal length of the first lens L1. By making the optical lens 100 satisfy the above relationship, the ratio of the focal length of the first lens L1 to the focal length of the optical lens 100 can be reasonably configured. For the entire optical lens 100, the refractive power of the first lens L1 will not be too strong, avoiding introducing too much spherical aberration, and enabling the optical lens 100 to have good imaging quality.

[0034] In some embodiments, the optical lens 100 satisfies the following relationship: -1.8 < fz1 / f2 < -1.2; for example, fz1 / f2 is -1.79, -1.7, -1.6, -1.5, -1.4, -1.3, -1.21, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and f2 is the effective focal length of the second lens L2. By making the optical lens 100 satisfy the above relationship, it is beneficial to reduce the deflection angle of light in the second lens L2, and at the same time, the negative refractive power provided by the second lens L2 can effectively balance the spherical aberration of the optical lens 100, effectively correcting the aberration, thereby achieving good imaging quality. At the same time, it is also beneficial to reasonably configure the central thickness of the second lens L2, thereby shortening the total length of the optical lens 100. In addition, it is beneficial to expand the field angle of the optical lens 100.

[0035] In some embodiments, the optical lens 100 satisfies the following relationship: 0 < fz1 / |f3| < 1.4; for example, fz1 / |f*3| is 0.001, 0.1, 0.3, 0.5, 0.7, 0.9, 1.2, 1.39, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and f3 is the effective focal length of the third lens L3. By making the optical lens 100 satisfy the above relationship, it is beneficial to balance the spherical aberration generated by the second lens L2 and can effectively correct the off-axis aberration of the optical lens 100, thereby improving the imaging quality.

[0036] In some embodiments, the optical lens 100 satisfies the following relational expression: -2.2 < fz1 / f4 < -0.8; for example, fz1 / f4 is -2.19, -2, -1.6, -2.45, -1.4, -1.1, -0.9, -0.81, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and f4 is the effective focal length of the fourth lens L4. By making the optical lens 100 satisfy the above relational expression, it can be used to adjust the overall refractive power of the optical lens 100, balance the distortion generated by the first lens L1, the second lens L2, and the third lens L3, avoid excessive refractive index and cause high-order aberrations, thereby improving the imaging quality of the optical lens 100.

[0037] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.5 < fz1 / f12 < 1.6; for example, fz1 / f12 is 1.51, 1.53, 1.55, 1.56, 1.57, 1.58, 1.59, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and f12 is the combined effective focal length of the first lens L1 and the second lens L2. By making the optical lens 100 satisfy the above relational expression, it is beneficial for the first lens L1 and the second lens L2 to mutually regulate to control aberrations, facilitate receiving large-angle incident light, and control the incident light to enter the optical lens 100 gently, thereby reducing the tolerance sensitivity of the optical lens 100.

[0038] In some embodiments, the optical lens 100 satisfies the following relational expression: -1.1 < fz1 / f34 < -0.8; for example, fz1 / f34 is -1.09, -1.05, -1, -0.95, -0.9, -0.87, -0.84, -0.81, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and f34 is the combined effective focal length of the third lens L3 and the fourth lens L4. By making the optical lens 100 satisfy the above relational expression, it is beneficial for the third lens L3 to the fourth lens L4 to cooperate synergistically to gradually eliminate chromatic aberration, thereby improving the imaging quality.

[0039] In some embodiments, the optical lens 100 satisfies the following relational expression: -1.8 < f34 / f12 < -1.5; for example, f34 / f12 is -1.79, -1.75, -1.71, -1.68, -1.64, -1.6, -1.56, -1.51, etc. Here, f34 is the combined effective focal length of the third lens L3 and the fourth lens L4, and f12 is the combined effective focal length of the first lens L1 and the second lens L2. By making the optical lens 100 satisfy the above relational expression, it is beneficial to control the refractive power of the third lens L3 and the fourth lens L4 within a suitable range, control the coma and field curvature of the optical lens 100, and reduce the manufacturing sensitivity of the optical lens 100.

[0040] In some embodiments, the optical lens 100 satisfies the following relationship: 3.6 < fz1 / R11 < 4; for example, fz1 / R11 is 3.61, 3.65, 3.7, 3.75, 3.8, 3.85, 3.87, 3.9, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and R11 is the curvature radius of the object side surface S1 of the first lens L1 at the optical axis. In some embodiments, the optical lens 100 satisfies the following relationship: -1.6 < R12 / fz1 < -0.6; for example, R12 / fz1 is -1.59, -1.4, -1.3, -1.1, -0.9, -0.8, -0.7, -0.61, etc. Here, R12 is the curvature radius of the image side surface S2 of the first lens L1 at the optical axis. By making the optical lens 100 satisfy at least one of the above relationships, it is beneficial to maintain the astigmatism of the first lens L1 within a reasonable range, so that the optical lens 100 has good imaging quality.

[0041] In some embodiments, the optical lens 100 satisfies the following relationship: -2.4 < R21 / fz1 < -1.4; for example, R21 / fz1 is -2.39, -2.2, -2, -1.8, -1.7, -1.6, -1.5, -1.41, etc. Here, R21 is the curvature radius of the object side surface S3 of the second lens L2 at the optical axis, and fz1 is the effective focal length of the optical lens 100 in the telephoto state. In some embodiments, the optical lens 100 satisfies the following relationship: 1.3 < |R22| / fz1; for example, |R22| / fz1 is 1.31, 5, 10, 15, 20, 24, 26, 30, etc. Here, R22 is the curvature radius of the image side surface S4 of the second lens L2 at the optical axis. By making the optical lens 100 satisfy at least one of the above relationships, it is beneficial to maintain the astigmatism of the second lens L2 within a reasonable range and effectively balance the astigmatism generated by the first lens L1, so that the optical lens 100 has good imaging quality.

[0042] In some embodiments, the optical lens 100 satisfies the following relationship: -4.1 < R31 / fz1 < -3; for example, R31 / fz1 is -4.09, -3.8, -3.5, -3.4, -3.3, -3.2, -3.15, -3.1, etc. Here, R31 is the curvature radius of the object side surface S5 of the third lens L3 at the optical axis, and fz1 is the effective focal length of the optical lens 100 in the telephoto state. In some embodiments, the optical lens 100 satisfies the following relationship: -5.6 < R32 / fz1 < -3.1; for example, R32 / fz1 is -5.5, -5, -4.5, -4, -3.6, -3.4, -3.3, -3.2, etc. Here, R32 is the curvature radius of the image side surface S6 of the third lens L3 at the optical axis. By making the optical lens 100 satisfy at least one of the above relationships, it is beneficial to maintain the surface shape of the third lens L3 within a reasonable range and effectively balance the aberration generated by the first lens L1 and the second lens L2, so that the optical lens 100 has good imaging quality.

[0043] In some embodiments, the optical lens 100 satisfies the following relationship: 2.1 < |R41| / fz1 < 5; for example, |R41| / fz1 is 2.11, 2.5, 2.8, 3.2, 3.8, 4.1, 4.5, 4.99, etc. Here, R41 is the curvature radius of the object side surface S7 of the fourth lens L4 at the optical axis, and fz1 is the effective focal length of the optical lens 100 in the telephoto state. In some embodiments, the optical lens 100 satisfies the following relationship: -1.9 < R42 / fz1 < 4.2; for example, R42 / fz1 is -1.89, -1, 1, 1.5, 2, 2.5, 3, 4.1, etc. Here, R42 is the curvature radius of the image side surface S8 of the fourth lens L4 at the optical axis. By making the optical lens 100 satisfy at least one of the above relationships, it is beneficial to maintain the surface shape of the fourth lens L4 within a reasonable range and balance the distortion generated by the first lens L1, the second lens L2, and the third lens L3, so that the optical lens 100 has good imaging quality.

[0044] In some embodiments, the optical lens 100 satisfies the following relational expression: 4.4 < TTL / ImgH < 5.5; for example, TTL / ImgH is 4.41, 4.5, 4.6, 4.8, 5, 5.1, 5.3, 5.49, etc. Here, TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100, and ImgH is half of the image height corresponding to the maximum field angle of the optical lens 100. By making the optical lens 100 satisfy the above relational expression, it is beneficial to improve the resolution of the optical lens 100 in the full field of view and enhance the imaging quality of the edge field of view; at the same time, the optical lens 100 can have an ultra-thin characteristic, which is beneficial for the optical lens 100 to have a smaller overall optical length, and has more advantages in shooting medium focal length object distance scenes and miniaturizing the camera lens.

[0045] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.9 < TTL / fz1 < 1; for example, TTL / fz1 is 0.91, 0.92, 0.93, 0.94, 0.95, 0.96, 0.97, 0.99, etc. Here, TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100, and fz1 is the effective focal length of the optical lens 100 in the telephoto state. By making the optical lens 100 satisfy the above relational expression, it is beneficial to reasonably configure the ratio of the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100 to the effective focal length of the optical lens 100, so that the optical lens 100 has a smaller overall optical length, realizes the miniaturization characteristic, and also enables the optical lens 100 to have a better telephoto effect.

[0046] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.5 < SD1 / SD5 < 1.7; for example, SD1 / SD5 is 1.51, 1.54, 1.55, 1.57, 1.6, 1.63, 1.65, 1.69, etc. Here, SD1 is half of the maximum effective aperture of the object side surface S1 of the first lens L1, and SD5 is half of the maximum effective aperture of the object side surface S3 of the third lens L3. By making the optical lens 100 satisfy the above relational expression, it is beneficial to control the ratio of half of the maximum effective aperture of the object side surface S1 of the first lens L1 to half of the maximum effective aperture of the object side surface S3 of the third lens L3 within a reasonable range, increase the field angle of the optical lens 100, and thus reduce the volume of the optical lens 100. Below the lower limit of the relational expression, the maximum effective aperture of the object side surface S1 of the first lens L1 is too small, which is not conducive to large-angle light entering the optical lens 100 and reduces the imaging range of the optical lens 100; exceeding the upper limit of the relational expression, the step difference in the direction perpendicular to the optical axis from the first lens L1 to the third lens L3 is too large, which is likely to increase the sensitivity of the optical lens 100 and reduce the stability of the optical lens 100.

[0047] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.4 < SD1 / SD8 < 1.6; for example, SD1 / SD8 is 1.41, 1.45, 1.49, 1.5, 1.52, 1.54, 1.56, 1.59, etc. Here, SD1 is half of the maximum effective aperture of the object side S1 of the first lens L1, and SD8 is half of the maximum effective aperture of the image side S8 of the fourth lens L4. By making the optical lens 100 satisfy the above relational expression, it can be ensured that the apertures of the object side S1 of the first lens L1 and the image side S8 of the fourth lens L4 are within a suitable range, thereby controlling the aperture of the first lens L1. While the optical lens 100 has a large viewing angle, the viewpoint depth of the entire optical lens 100 can be effectively reduced.

[0048] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.05 < FOVz1 / FOVz2 < 1.2; for example, FOVz1 / FOVz2 is 1.06, 1.08, 1.10, 1.12, 1.14, 1.16, 1.18, 1.19, etc. Here, FOVz1 is the maximum viewing angle of the optical lens 100 in the telephoto state, and FOVz2 is the maximum viewing angle of the optical lens 100 in the close-focus state. By making the optical lens 100 satisfy the above relational expression, the telephoto end can provide a sufficiently wide field of view for shooting large scenes, while the close-focus end can naturally narrow the viewing angle to highlight the main body details, avoiding the compositional discomfort caused by sudden changes in the viewing angle. At the same time, this ratio range ensures that various aberrations of the optical lens 100 are effectively controlled during the zooming process, enabling excellent imaging sharpness and low distortion to be maintained throughout the focal length range. It not only meets the diverse shooting needs of users from long-distance views to close-ups but also ensures the miniaturization and lightweight design of the optical lens 100.

[0049] In some embodiments, the optical lens 100 satisfies the following relational expression: 1.2 < fz1 / fz2 < 1.3; for example, fz1 / fz2 is 1.21, 1.22, 1.23, 1.24, 1.25, 1.26, 1.27, 1.29, etc. Here, fz1 is the effective focal length of the optical lens 100 in the telephoto state, and fz2 is the effective focal length of the optical lens 100 in the close-focus state. By making the optical lens 100 satisfy the above relational expression, the effective focal length of the optical lens 100 in the long focal length state and the effective focal length of the optical lens 100 in the short focal length state are reasonably limited, ensuring that the optical lens 100 obtains a large zoom ratio, enabling the electronic device equipped with the optical lens 100 to have a large zoom range, and effectively improving the user experience.

[0050] In some embodiments, the optical lens 100 satisfies the following relationship: 1.8 < CT1 / CT2 ≤ 2.4; for example, CT1 / CT2 is 1.81, 1.9, 2, 2.1, 2.2, 2.3, 2.35, 2.39, etc. Here, CT1 is the thickness of the first lens L1 on the optical axis, and CT2 is the thickness of the second lens L2 on the optical axis. By making the optical lens 100 satisfy the above relationship, 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 is controlled within a reasonable range, which is beneficial to effectively balance the optical path difference of the optical lens 100, reduce the size of the optical lens 100, maintain the ultra-thin characteristic of the second lens L2, and is beneficial to the second lens L2 becoming the key lens for correcting the peripheral field distortion and improving the imaging performance.

[0051] In some embodiments, the optical lens 100 satisfies the following relationship: 1.1 < CT3 / CT4 < 2.1; for example, CT3 / CT4 is 1.11, 1.3, 1.5, 1.7, 1.9, 2, 2.05, 2.09, etc. Here, CT3 is the thickness of the third lens L3 on the optical axis, and CT4 is the thickness of the fourth lens L4 on the optical axis. By making the optical lens 100 satisfy the above relationship, the ratio of the thickness of the third lens L3 on the optical axis to the thickness of the fourth lens L4 on the optical axis can be controlled within a reasonable range, which is beneficial to effectively balance the optical path difference of the optical lens 100, reduce the size of the optical lens 100, and maintain the ultra-thin characteristic of the fourth lens L4.

[0052] In some embodiments, the optical lens 100 satisfies the following relationship: 2 < CT1 / CT3 < 2.3; for example, CT1 / CT3 is 2.01, 2.05, 2.1, 2.15, 2.2, 2.23, 2.26, 2.29, etc. CT1 is the thickness of the first lens L1 on the optical axis, and CT3 is the thickness of the third lens L3 on the optical axis. By making the optical lens 100 satisfy the above relationship, the ratio of the central thickness of the third lens L3 to the central thickness of the first lens L1 can be within a certain range, which is beneficial to ensuring that the optical lens 100 has better uniformity, while reducing the sensitivity of the thickness of the optical lens 100, and further beneficial to balancing the field curvature of the optical lens 100, so that the field curvature balance ability of the optical lens 100 is better.

[0053] In some embodiments, the optical lens 100 satisfies the following relationship: 2.5 < CT1 / CT4 < 4.1; for example, CT1 / CT4 is 2.51, 2.8, 3.2, 3.6, 3.8, 3.9, 4, 4.09, etc. CT1 is the thickness of the first lens L1 on the optical axis, and CT4 is the thickness of the fourth lens L4 on the optical axis. By making the optical lens 100 satisfy the above relationship, the thicknesses of the first lens L1 and the fourth lens L4 will be reasonably configured, so that the refractive power of the lenses in the optical lens 100 can be reasonably distributed, thereby effectively correcting the spherical aberration of the optical lens 100. At the same time, the thicknesses of the first lens L1 and the fourth lens L4 are relatively uniform, meeting the processing technology requirements.

[0054] In some embodiments, the optical lens 100 satisfies the following relationship: 1.2 < TDz2 / TDz1 < 1.4; for example, TDz2 / TDz1 is 1.21, 1.25, 1.75, 1.2, 1.25, 1.3, 1.35, 1.39, etc. Here, TDz2 is the distance on the optical axis from the object side surface S1 of the first lens L1 in the near-focus state to the image side surface S8 of the fourth lens L4, and TDz1 is the distance on the optical axis from the object side surface S1 of the first lens L1 in the far-focus state to the image side surface S8 of the fourth lens L4. By making the optical lens 100 satisfy the above relationship, it means that the overall optical length of the lens group in the near-focus state is slightly greater than that of the lens group in the far-focus state, ensuring that the optical lens 100 can provide sufficient focus adjustment space in the near-focus state, while avoiding structural complexity or volume expansion caused by excessive changes in the optical length. In addition, this ratio range helps to balance aberration correction, ensuring high imaging quality throughout the entire zoom range from far focus to near focus.

[0055] In some embodiments, the optical lens 100 satisfies the following relational expression: 4.2 < TDz1 / Bz1 < 5.4; for example, TDz1 / Bz1 is 4.21, 4.3, 4.4, 4.5, 4.7, 4.9, 5, 5.39, etc. Here, TDz1 is the distance on the optical axis from the object side surface S1 of the first lens L1 to the image side surface S8 of the fourth lens L4 in the telephoto state, and Bz1 is the minimum distance from the fourth lens L4 to the imaging surface IMG of the optical lens 100 in the telephoto state. By making the optical lens 100 satisfy the above relational expression, it is beneficial to ensure that there is a sufficient focusing range for the assembly of the image side surface S8 of the fourth lens L4 and the image sensor while maintaining the miniaturization of the optical lens 100. When exceeding the upper limit of the relational expression, the back focal length of the optical lens 100 is too large, and it is difficult to shorten the total length of the optical lens 100, which is not conducive to maintaining miniaturization; when lower than the lower limit of the relational expression, the distance on the optical axis from the image side surface S8 of the fourth lens L4 to the imaging surface IMG of the optical lens 100 (i.e., the back focal length of the optical lens 100) is too short, which easily causes the incident angle of light reaching the imaging surface IMG to be too large, affecting the efficiency of the image sensor to receive light and reducing the imaging quality.

[0056] In some embodiments, the optical lens 100 satisfies the following relational expression: 0.7 < TDz2 / Bz2 < 1.5; for example, TDz2 / Bz2 is 0.71, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.49, etc. Here, TDz2 is the distance on the optical axis from the object side surface S1 of the first lens L1 to the image side surface S8 of the fourth lens L4 in the near - focus state, and Bz2 is the minimum distance from the fourth lens L4 to the imaging surface IMG of the optical lens 100 in the near - focus state. By making the optical lens 100 satisfy the above relational expression, it can ensure that the optical lens 100 can maintain a short back working distance at near - focus to adapt to a compact structure, and can correct aberrations through a reasonable optical layout, so as to provide high - resolution and low - distortion clear imaging during macro shooting while maintaining the portability of the overall design.

[0057] In some embodiments, the optical lens 100 satisfies the following relational expression: 2.4 < TTL / ΣCT < 2.7; for example, TTL / ΣCT is 2.41, 2.5, 2.53, 2.56, 2.59, 2.61, 2.65, 2.69, etc. Here, TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface IMG of the optical lens 100, and ΣCT is the sum of the thicknesses of all lenses from the first lens L1 to the fourth lens L4 on the optical axis. By making the optical lens 100 satisfy the above relational expression, it can effectively shorten the total length of the optical lens 100 while meeting high pixel and high imaging quality, and further compress the overall length of the optical lens 100, making the overall structure of the optical lens 100 more compact and achieving the miniaturization and thin - and - light design of the optical lens 100.

[0058] In some embodiments, the optical lens 100 satisfies the following relational expression: 30 < (CT1 + CT2) / AT12 < 39; for example, (CT1 + CT2) / AT12 is 30.1, 31, 32, 33, 34, 35, 36.5, 38.9, etc. Here, CT1 is the thickness of the first lens L1 on the optical axis, CT2 is the thickness of the second lens L2 on the optical axis, and AT12 is the distance on the optical axis from the image side surface S2 of the first lens L1 to the object side surface S3 of the second lens L2. By making the optical lens 100 satisfy the above relational expression, the thicknesses of the first lens L1 and the second lens L2 can be maintained appropriately, and at the same time, the distance between the first lens L1 and the second lens L2 is also reasonable, thereby effectively improving the structural compactness of the optical lens 100, and further facilitating the molding and assembly of the first lens L1 and the second lens L2.

[0059] In some embodiments, the optical lens 100 satisfies the following relational expression: 3 < (CT3 + CT4) / AT34 < 41; for example, (CT3 + CT4) / AT34 is 3.01, 10, 15, 20, 25, 30, 35, 40.9, etc. Here, CT3 is the thickness of the third lens L3 on the optical axis, CT4 is the thickness of the fourth lens L4 on the optical axis, and AT34 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. By making the optical lens 100 satisfy the above relational expression, the thicknesses of the third lens L3 and the fourth lens L4 can be maintained appropriately, and at the same time, the distance between the third lens L3 and the fourth lens L4 is also reasonable, which is beneficial for the optical lens 100 to meet the characteristics of miniaturization, and at the same time can reduce the risk of ghost image generation and improve the imaging quality.​​​​​In some embodiments, the optical lens 100 satisfies the following relationship: 2.2 < Bz2 / Bz1 < 2.8; for example, Bz2 / Bz1 is 2.21, 2.3, 2.35, 2.45, 2.54, 2.65, 2.75, 2.79, etc. Here, Bz2 is the minimum distance from the fourth lens L4 to the imaging surface IMG of the optical lens 100 in the near-focus state, and Bz1 is the minimum distance from the fourth lens L4 to the imaging surface IMG of the optical lens 100 in the far-focus state. By making the optical lens 100 satisfy the above relationship, the optical lens 100 can maintain a smooth movement of the image plane during the switching from far focus to near focus, reduce aberration fluctuations, and at the same time take into account the compactness of the mechanical structure, ultimately achieving high-resolution imaging in the entire focal length range.

[0062] In some embodiments, the materials of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can all be glass, so that while the optical lens 100 has good optical effects, it can also reduce the influence of temperature on the above lenses. In some embodiments, among the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4, some can use glass materials and the other part can use plastic materials, so that while ensuring the reduction of the influence of temperature on the lenses to achieve better imaging effects, it can also reduce the processing cost of the lenses and reduce the weight of the lenses, thereby reducing the processing cost of the optical lens 100 and reducing the overall weight of the optical lens 100. In some embodiments, the materials of the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 can all be plastic to reduce the weight of the optical lens 100 and lower the cost.

[0063] In some embodiments, in order to increase the freedom of surface shape design, the surfaces of the above first lens L1, second lens L2, third lens L3, and fourth lens L4 can all adopt an aspherical design, so that the imaging quality can be guaranteed. It can be understood that in some other embodiments, the surfaces of the first lens L1, second lens L2, third lens L3, and fourth lens L4 in the optical lens 100 can also adopt a spherical design.

[0064] In some embodiments, the optical lens 100 further includes an aperture stop STO, and the aperture stop STO can be an aperture stop and / or a field stop. For example, the aperture stop STO can be an aperture stop, or the aperture stop STO can be a field stop, or the aperture stop STO can be an aperture stop and a field stop. In this embodiment, the aperture stop STO is disposed on the object side surface S1 of the first lens L1. It can be understood that in other embodiments, the aperture stop STO can also be disposed between other lenses and adjusted according to actual situations, and this embodiment does not make specific limitations in this regard.

[0065] In some embodiments, the optical lens 100 further includes an IR filter disposed between the fourth lens element L4 and the imaging surface IMG of the optical lens 100. In this embodiment, the IR filter can be an infrared cutoff filter, thereby filtering out light of other wavelengths, such as infrared light, while allowing only visible light to pass through, making the image more consistent with the visual experience of the human eye.

[0066] Of course, the filter IR can also be an infrared bandpass filter, which can filter out light in other bands such as visible light and only allow infrared light to pass through. By filtering out light in other bands such as visible light, the imaging quality is improved.

[0067] It is understandable that the filter IR can be made of glass, optical glass coating, or other materials. It can be selected according to actual needs and is not specifically limited in this embodiment.

[0068] The distance from the object-side surface S1 of the first lens L1 to the object end is defined as the object distance of the optical lens 100. By adjusting the object distance of the optical lens 100, the optical lens 100 can capture different shooting ranges. The state of the optical lens 100 with an infinite object distance is defined as the telefocus state of the optical lens 100, and the state of the optical lens 100 with a small object distance (for example, an object distance less than or equal to 100 mm) is defined as the near-focus state of the optical lens 100.

[0069] First embodiment

[0070] See Figure 1 and Figure 3 The optical lens 100 in this embodiment has a total of four lenses with refractive power, including an aperture STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a filter IR, which are arranged in sequence from the object side to the image side along the optical axis.

[0071] The first lens L1 and the second lens L2 constitute a first lens group G1, and the third lens L3 and the fourth lens L4 constitute a second lens group G2. The first lens group G1 is fixed relative to the imaging surface IMG of the optical lens 100, and 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.

[0072] The first lens L1 has positive refractive power, with its object-side surface S1 and image-side surface S2 both convex at the near optical axis. The second lens L2 has negative refractive power, with its object-side surface S3 and image-side surface S4 both concave at the near optical axis. The third lens L3 has positive refractive power, with its object-side surface S5 concave at the near optical axis, and its image-side surface S6 convex at the near optical axis. The fourth lens L4 has negative refractive power, with its object-side surface S7 and image-side surface S8 both concave at the near optical axis.

[0073] Specifically, the parameters of optical lens 100 are provided by the following table 1. Wherein, along the optical axis of optical lens 100, each element from the object side to the image side is arranged in the order of each element from top to bottom according to table 1. In the same lens, the surface with smaller face serial number is the object side of this lens, and the surface with larger face serial number is the image side of this lens, such as face serial numbers 1 and 2 corresponding to the object side S1 and image side S2 of the first lens L1 respectively. The Y radius in table 1 is the radius of curvature of the object side or image side of the corresponding face serial number at the optical axis. The first numerical value in the "thickness" parameter row of lens is the thickness of this lens on the optical axis, and the second numerical value is the distance from the image side of this lens to the back surface on the optical axis. The value for Stop STO in the "Thickness" column is the distance from Stop STO to the vertex of the next lens surface (the vertex refers to the intersection of the surface with the optical axis) on the optical axis. By default, the direction from the object side of the first lens L1 to the image side of the last lens element is considered the positive direction of the optical axis. A negative value indicates that Stop STO is located on the image side of the next lens surface vertex. A positive value indicates that Stop STO is located on the object side of the next lens surface vertex. It should be understood that the units of the Y radius, thickness, and focal length in Table 1 are all in mm, and that the refractive index, Abbe number, and focal length in Table 1 are all obtained at a reference wavelength of 555 nm. Considering that the optical lens 100 of the present application can achieve internal focus, it has a far-focus state and a near-focus state. Therefore, it has different object distances A in the far-focus state and the near-focus state, respectively. At the same time, when in the far-focus state and the near-focus state, the air spacing T23 (i.e., B in Table 1) from the image side surface S4 of the second lens L2 to the object side surface S5 of the third lens L3 in the optical axis direction is different, and the air spacing (i.e., C in Table 1) from the image side surface S8 of the fourth lens L4 to the filter IR in the optical axis direction is also different.

[0074] Based on this, we compiled Table 2, which shows the values ​​of A, B, C, FNO, TTL, FOV, ImgH, and f in the far and near focus states. In Table 2, FOV is in degrees, FNO has no unit, and all other parameters are in millimeters.

[0075] In addition, surface numbers 1 and 2 in Tables 1 and 3 below correspond to the object-side surface S1 and image-side surface S2 of the first lens element L1, respectively. Surface numbers 3 and 4 correspond to the object-side surface S3 and image-side surface S4 of the second lens element L2, respectively. Similarly, surface numbers 7 and 8 correspond to the object-side surface S7 and image-side surface S8 of the fourth lens element L4, respectively.

[0076] In the first embodiment, the object-side surface and the inverted image surface of any of the first lens L1 to the fourth lens L4 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0077]

[0078] Where x is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, h is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula. Table 3 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces S1, S2, S3, S4, S5, S6, S7, and S8 that can be used in the first embodiment.

[0079] Table 1

[0080]

[0081]

[0082] Table 2

[0083] parameter A B C FNO TTL FOV IhD f Far Focus unlimited 2.000 4.608 2.850 16.22 21.221° 3.28 17.27 Close focus 100.00 4.715 1.893 2.953 16.22 19.51° 3.28 13.91

[0084] Table 3

[0085]

[0086]

[0087] See also Figure 2 、 Figure 4 (A) in Figure 2 、 Figure 4 (A) in the figure shows the longitudinal spherical aberration diagrams of the optical lens 100 in the first embodiment at wavelengths of 650.00nm, 610.00nm, 555.00nm, 510.00nm, 470.00nm and 435.00nm in the far focus state and the near focus state, respectively. The horizontal axis along the X-axis represents the focus offset in mm, and the vertical axis along the Y-axis represents the normalized field of view. Figure 2 、 Figure 4 As can be seen from (A) in the far focus state (such as Figure 2 ) and near focus state (such as Figure 4 ), the spherical aberration value of the optical lens 100 in the first embodiment is better, indicating that the imaging quality of the optical lens 100 in this embodiment is better.

[0088] See also Figure 2 、 Figure 4 (B) in Figure 2 、 Figure 4(B) in FIG. 1 shows the astigmatism diagram of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm in the far focus state and the near focus state, respectively. The horizontal axis along the X-axis represents the focus offset, and the vertical axis along the Y-axis represents the image height, both in mm. In the astigmatism diagram, T represents the curvature of the imaging surface IMG in the meridional direction, and S represents the curvature of the imaging surface IMG in the sagittal direction. Figure 2 、 Figure 4 As can be seen from (B) in the figure, at this wavelength, the far-focus state (such as Figure 2 ) and near focus state (such as Figure 4 )'s astigmatism of the optical lens 100 is well compensated.

[0089] See also Figure 2 、 Figure 4 (C) in Figure 2 、 Figure 4 (C) in FIG. 1 shows the distortion curves of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm in the far focus state and the near focus state, respectively. The horizontal axis along the X-axis represents the distortion, and the vertical axis along the Y-axis represents the image height, both in mm. Figure 2 、 Figure 4 As can be seen from (C) in the figure, at this wavelength, the far-focus state (such as Figure 2 ) and near focus state (such as Figure 4 )'s optical lens 100 has been well corrected for distortion.

[0090] Second embodiment

[0091] See Figure 5 The optical lens 100 in this embodiment has a total of four lenses with refractive power, including an aperture STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a filter IR, which are arranged in sequence from the object side to the image side along the optical axis.

[0092] The first lens L1 and the second lens L2 constitute a first lens group G1, and the third lens L3 and the fourth lens L4 constitute a second lens group G2. The first lens group G1 is fixed relative to the imaging surface IMG of the optical lens 100, and 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.

[0093] The first lens element L1 has positive refractive power, with its object-side surface S1 and image-side surface S2 both convex at the near optical axis. The second lens element L2 has negative refractive power, with its object-side surface S3 and image-side surface S4 both concave at the near optical axis. The third lens element L3 has positive refractive power, with its object-side surface S5 concave at the near optical axis, and its image-side surface S6 convex at the near optical axis. The fourth lens element L4 has negative refractive power, with its object-side surface S7 concave at the near optical axis, and its image-side surface S8 convex at the near optical axis.

[0094] Table 4 shows the various parameters of the optical lens 10 of this embodiment, where the focal length, material refractive index, and Abbe number are all obtained using visible light with a reference wavelength of 555 nm. The units of the Y radius, thickness, focal length, and effective semi-aperture are all in millimeters (mm). The meanings of the other parameters are the same as those of the first embodiment.

[0095] Table 4

[0096]

[0097]

[0098] Table 5

[0099] parameter A B C FNO TTL FOV IhD f Far Focus unlimited 1.990 5.017 2.850 17.85 19.299° 3.28 19 Close focus 100.00 5.457 1.550 2.963 17.85 17.52° 3.28 15.04

[0100] Table 6

[0101]

[0102]

[0103] See also Figure 6 ,Depend on Figure 6 As can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B), and distortion curve diagram (C), in the telephoto state, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 6 The wavelengths corresponding to the curves (A), (B) and (C) can be referred to in the first embodiment. Figure 2 and Figure 4 The contents described in (A), (B) and (C) will not be repeated here.

[0104] Third embodiment

[0105] See also Figure 7 The optical lens 100 in this embodiment has a total of four lenses with refractive power, including an aperture STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a filter IR, which are arranged in sequence from the object side to the image side along the optical axis.

[0106] The first lens L1 and the second lens L2 constitute a first lens group G1, and the third lens L3 and the fourth lens L4 constitute a second lens group G2. The first lens group G1 is fixed relative to the imaging surface IMG of the optical lens 100, and 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.

[0107] The first lens L1 has positive refractive power, with its object-side surface S1 and image-side surface S2 both convex at the near optical axis. The second lens L2 has negative refractive power, with its object-side surface S3 and image-side surface S4 both concave at the near optical axis. The third lens L3 has negative refractive power, with its object-side surface S5 concave at the near optical axis, and its image-side surface S6 convex at the near optical axis. The fourth lens L4 has negative refractive power, with its object-side surface S7 convex at the near optical axis, and its image-side surface S8 concave at the near optical axis.

[0108] Table 7 shows the parameters of the optical lens 10 of this embodiment, where the focal length, material refractive index, and Abbe number are all obtained using visible light with a reference wavelength of 555 nm. The units of the Y radius, thickness, focal length, and effective semi-aperture are all in millimeters (mm). The meanings of the other parameters are the same as those of the first embodiment.

[0109] Table 7

[0110]

[0111] Table 8

[0112] parameter A B C FNO TTL FOV IhD f Far Focus unlimited 1.302 4.743 2.849 14.5 23.522° 3.28 15.5 Close focus 100.00 3.549 2.497 2.963 14.5 21.73° 3.28 12.89

[0113] Table 9

[0114]

[0115] See also Figure 8 ,Depend on Figure 8 As can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B), and distortion curve diagram (C), in the telephoto state, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 8 The wavelengths corresponding to the curves (A), (B) and (C) can be referred to in the first embodiment. Figure 2 and Figure 4 The contents described in (A), (B) and (C) will not be repeated here.

[0116] Fourth embodiment

[0117] See also Figure 9The optical lens 100 in this embodiment has a total of four lenses with refractive power, including an aperture STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a filter IR, which are arranged in sequence from the object side to the image side along the optical axis.

[0118] The first lens L1 and the second lens L2 constitute a first lens group G1, and the third lens L3 and the fourth lens L4 constitute a second lens group G2. The first lens group G1 is fixed relative to the imaging surface IMG of the optical lens 100, and 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.

[0119] The first lens element L1 has positive refractive power, with both its object-side surface S1 and image-side surface S2 being convex at the near optical axis. The second lens element L2 has negative refractive power, with its object-side surface S3 being concave at the near optical axis, and its image-side surface S4 being convex at the near optical axis. The third lens element L3 has positive refractive power, with its object-side surface S5 being concave at the near optical axis, and its image-side surface S6 being convex at the near optical axis. The fourth lens element L4 has negative refractive power, with its object-side surface S7 being concave at the near optical axis, and its image-side surface S8 being convex at the near optical axis.

[0120] Table 10 shows the parameters of the optical lens 10 of this embodiment, where the focal length, material refractive index, and Abbe number are all obtained using visible light with a reference wavelength of 555 nm. The units of the Y radius, thickness, focal length, and effective semi-aperture are all in millimeters (mm). The meanings of the other parameters are the same as those of the first embodiment.

[0121] Table 10

[0122]

[0123] Table 11

[0124] parameter A B C FNO TTL FOV IhD f Far Focus unlimited 2.006 4.768 2.599 16.62 21.229° 3.28 17.26 Close focus 100.00 4.997 1.777 2.719 16.62 19.21° 3.28 14.16

[0125] Table 12

[0126]

[0127]

[0128] See also Figure 10 ,Depend on Figure 10 As can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B), and distortion curve diagram (C), in the telephoto state, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 10 The wavelengths corresponding to the curves (A), (B) and (C) can be referred to in the first embodiment. Figure 2 and Figure 4 The contents described in (A), (B) and (C) will not be repeated here.

[0129] Fifth embodiment

[0130] See also Figure 11 The optical lens 100 in this embodiment has a total of four lenses with refractive power, including an aperture STO, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a filter IR, which are arranged in sequence from the object side to the image side along the optical axis.

[0131] The first lens L1 and the second lens L2 constitute a first lens group G1, and the third lens L3 and the fourth lens L4 constitute a second lens group G2. The first lens group G1 is fixed relative to the imaging surface IMG of the optical lens 100, and 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.

[0132] The first lens L1 has positive refractive power, with its object-side surface S1 and image-side surface S2 both convex at the near optical axis. The second lens L2 has negative refractive power, with its object-side surface S3 and image-side surface S4 both concave at the near optical axis. The third lens L3 has positive refractive power, with its object-side surface S5 concave at the near optical axis, and its image-side surface S6 convex at the near optical axis. The fourth lens L4 has negative refractive power, with its object-side surface S7 and image-side surface S8 both concave at the near optical axis.

[0133] Table 13 shows the parameters of the optical lens 10 of this embodiment, where the focal length, material refractive index, and Abbe number are all obtained using visible light with a reference wavelength of 555 nm. The units of the Y radius, thickness, focal length, and effective semi-aperture are all millimeters (mm). The meanings of the other parameters are the same as those of the first embodiment.

[0134] Table 13

[0135]

[0136] Table 14

[0137] parameter A B C FNO TTL FOV IhD f Far Focus unlimited 1.998 4.560 3.100 15.9 21.253° 3.28 17.270 Close focus 100.00 4.565 1.994 3.232 15.9 19.39° 3.28 13.932

[0138] Table 15

[0139]

[0140]

[0141] See also Figure 12 ,Depend on Figure 12As can be seen from the longitudinal spherical aberration diagram (A), astigmatism diagram (B), and distortion curve diagram (C), in the telephoto state, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of this embodiment has good imaging quality. Figure 12 The wavelengths corresponding to the curves (A), (B) and (C) can be referred to in the first embodiment. Figure 2 and Figure 4 The contents described in (A), (B) and (C) will not be repeated here.

[0142] Please refer to Table 16, which is a summary of the ratios of various relationship equations in the first to fifth embodiments of the present application.

[0143] Table 16

[0144]

[0145]

[0146] See Figure 13 The present application also provides a camera module 200. The camera module 200 includes the optical lens 100 of any of the above embodiments and an image sensor 201. The image sensor 201 is disposed on the image side of the optical lens 100. The image sensor 201 can be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0147] See Figure 14 The embodiment of the present invention further provides an electronic device 300. The electronic device 300 includes a housing 301 and a camera module 200, wherein the camera module 200 is mounted on the housing 301. The electronic device 300 of the embodiment of the present application includes, but is not limited to, a driving recorder, a smart phone, a tablet computer, a laptop computer, an e-book reader, a portable multimedia player (PMP), a portable phone, a video phone, a mobile medical device, a wearable device, and other electronic devices that support imaging.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An optical lens, characterized in that: There are a total of four lenses with refractive power, including a first lens, a second lens, a third lens, and a fourth lens arranged in sequence from the object side to the image side along the optical axis; The first lens and the second lens form a first lens group, the third lens and the fourth lens form a second lens group, the first lens group is fixed relative to the imaging surface of the optical lens, and the second lens group moves along the optical axis direction between the first lens group and the imaging surface of the optical lens; The first lens has positive refractive power, and both its object side and image side are convex near the optical axis; the second lens has negative refractive power, and its object side is concave near the optical axis; the third lens has refractive power, its object side is concave near the optical axis, and its image side is convex near the optical axis; the fourth lens has negative refractive power; The optical lens satisfies the following relational expressions: 17° < FOV < 24°; 2.5 < FNO < 3.2; Where, 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, wherein: The optical lens satisfies the following relational expressions: 2.4 < fz1 / f1 < 2.9, and / or, -1.8 < fz1 / f2 < -1.2, and / or, 0 < fz1 / |f3| < 1.4, and / or, -2.2 < fz1 / f4 < -0.8, and / or, 1.5 < fz1 / f12 < 1.6, and / or, -1.1 < fz1 / f34 < -0.8, and / or, -1.8 < f34 / f12 < -1.5; Where, fz1 is the effective focal length of the optical lens in the telephoto state, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f3 is the effective focal length of the third lens, f4 is the effective focal length of the fourth lens, f12 is the combined effective focal length of the first lens and the second lens, and f34 is the combined effective focal length of the third lens and the fourth lens.

3. The optical lens according to claim 1, wherein: The optical lens satisfies the following relational expressions: 3.6 < fz1 / R11 < 4, and / or, -1.6 < R12 / fz1 < -0.6, and / or, -2.4 < R21 / fz1 < -1.4, and / or, 1.3 < |R22| / fz1, and / or, -4.1 < R31 / fz1 < -3, and / or, -5.6 < R32 / fz1 < -3.1, and / or, 2.1 < |R41| / fz1 < 5, and / or, -1.9 < R42 / fz1 < 4.2; Where, fz1 is the effective focal length of the optical lens in the telephoto state, R11 is the curvature radius of the object side surface of the first lens on the optical axis, R12 is the curvature radius of the image side surface of the first lens on the optical axis, R21 is the curvature radius of the object side surface of the second lens on the optical axis, R22 is the curvature radius of the image side surface of the second lens on the optical axis, R31 is the curvature radius of the object side surface of the third lens on the optical axis, R32 is the curvature radius of the image side surface of the third lens on the optical axis, R41 is the curvature radius of the object side surface of the fourth lens on the optical axis, and R42 is the curvature radius of the image side surface of the fourth lens on the optical axis.

4. The optical lens according to claim 1, wherein: The optical lens satisfies the following relational expressions: 4.4 < TTL / ImgH < 5.5, and / or, 0.9 < TTL / fz1 < 1, and / or, 1.5 < SD1 / SD5 < 1.7, and / or, 1.4 < SD1 / SD8 < 1.6, and / or, 1.05 < FOVz1 / FOVz2 < 1.2, and / or, 1.2 < fz1 / fz2 < 1.3; Where, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, ImgH is half of the image height corresponding to the maximum field angle of the optical lens, fz1 is the effective focal length of the optical lens in the telephoto state, SD1 is half of the maximum effective aperture of the object side surface of the first lens, SD5 is half of the maximum effective aperture of the object side surface of the third lens, SD8 is half of the maximum effective aperture of the image side surface of the fourth lens, FOVz1 is the maximum field angle of the optical lens in the telephoto state, FOVz2 is the maximum field angle of the optical lens in the near - focus state, and fz2 is the effective focal length of the optical lens in the near - focus state.

5. The optical lens according to claim 1, wherein: The optical lens satisfies the following relational expressions: 1.8 < CT1 / CT2 ≤ 2.4, and / or, 1.1 < CT3 / CT4 < 2.1, and / or, 2 < CT1 / CT3 < 2.3, and / or, 2.5 < CT1 / CT4 < 4.1; Where, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, CT3 is the thickness of the third lens on the optical axis, and CT4 is the thickness of the fourth lens on the optical axis.

6. The optical lens according to claim 1, wherein: The optical lens satisfies the following relational expressions: The optical lens satisfies the following relational expressions: 1.2 < TDz2 / TDz1 < 1.4, and / or, 4.2 < TDz1 / Bz1 < 5.4, and / or, 0.7 < TDz2 / Bz2 < 1.5; 7. The optical lens according to claim 1, wherein: Where, TDz2 is the distance from the object side surface of the first lens in the near - focus state to the image side surface of the fourth lens on the optical axis, TDz1 is the distance from the object side surface of the first lens in the telephoto state to the image side surface of the fourth lens on the optical axis, Bz1 is the minimum distance from the fourth lens in the telephoto state to the imaging surface of the optical lens, and Bz2 is the minimum distance from the fourth lens in the near - focus state to the imaging surface of the optical lens. The optical lens satisfies the following conditional expressions: 2.4 < TTL / ΣCT < 2.7, and / or, 30 < (CT1 + CT2) / AT12 < 39, and / or, 3 < (CT3 + CT4) / AT34 < 41; Wherein, TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical lens, ΣCT is the sum of the thicknesses of all lenses from the first lens to the fourth lens on the optical axis, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, AT12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens, and AT34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens.

8. The optical lens according to claim 1, wherein: The optical lens satisfies the following conditional formula: 1.2 < GL1 / GL2 < 2.1, and / or, 2.2 < Bz2 / Bz1 < 2.8; Wherein, GL1 is the distance on the optical axis from the object side of the first lens to the image side of the second lens, GL2 is the distance on the optical axis from the object side of the third lens to the image side of the fourth lens, Bz1 is the minimum distance from the fourth lens to the imaging surface of the optical lens in the telephoto state, and Bz2 is the minimum distance from the fourth lens to the imaging surface of the optical lens in the close-focus state.

9. A camera module, characterized in that: Comprising: The optical lens according to any one of claims 1 to 8; and An image sensor disposed on the image side of the optical lens.

10. An electronic device, characterized in that: Comprising: A housing; and The imaging module according to claim 9, and the imaging module is mounted on the housing.

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