Optical lens

Abstract

The present invention discloses an optical lens, which is composed of five lenses and sequentially includes, along the optical axis from the object side to the imaging surface: a diaphragm; a first lens with a positive optical power, whose object side is convex and whose image side is concave; a second lens with a negative optical power, whose object side and image side are both concave; a third lens with a negative optical power, whose object side is convex and whose image side is concave; a fourth lens with a positive optical power, whose object side and image side are both convex; a fifth lens with a negative optical power, whose object side is concave and whose image side is convex. The optical lens provided by the present invention has a long focal length and high pixels by reasonably setting the focal lengths and surface types of the respective lenses, can achieve the effects of background blurring and high-definition imaging at a long distance, and can well meet the requirements of telephoto shooting.

Description

Technical Field

[0001] The present invention relates to the technical field of imaging lenses, and in particular to an optical lens. Background Art

[0002] At present, with the popularization of portable electronic devices and the popularity of social, video, and live streaming software, people's love for photography is increasing. Camera lenses have become a standard configuration of electronic devices, and even the primary consideration when consumers purchase electronic devices.

[0003] With the continuous development of mobile information technology and the rapid development of electronic devices such as smart phones, tablet computers, and e-readers, the industry's requirements for the camera functions of electronic devices are also getting higher and higher. Camera lenses with various different characteristics can adapt to different application scenarios and meet different shooting needs. In recent years, as consumers' requirements for the photo-taking effect of mobile phones during outings have been continuously increasing, in addition to the need for high pixels, they are more pursuing a sense of space during photo-taking, being able to highlight the subject. At this time, the advantages of telephoto lenses are revealed. Camera lenses with telephoto characteristics can capture distant scenes, effectively blur the background to highlight the subject, improve the imaging quality of distant scenes, and meet the telephoto shooting needs.

[0004] However, although common five-element optical lenses already have good optical performance, they cannot well meet the design requirements of long focal length and high pixel, which affects the shooting experience of users. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide an optical lens, which has at least the advantages of long focal length, high pixel, and small total length.

[0006] The present invention realizes the above-mentioned invention purpose through the following technical solutions.

[0007] The present invention provides an optical lens, which is composed of five lenses and sequentially includes, along the optical axis from the object side to the imaging surface: a diaphragm; a first lens with a positive optical power, the object side surface of the first lens is convex, and the image side surface of the first lens is concave; a second lens with a negative optical power, both the object side surface and the image side surface of the second lens are concave; a third lens with a negative optical power, the object side surface of the third lens is convex, and the image side surface of the third lens is concave; a fourth lens with a positive optical power, both the object side surface and the image side surface of the fourth lens are convex; a fifth lens with a negative optical power, the object side surface of the fifth lens is concave, and the image side surface of the fifth lens is convex; the optical lens satisfies the following conditional formula: 0.12 < CT12 / DT < 0.2, where CT12 represents the air spacing between the first lens and the second lens on the optical axis, and DT represents the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens.

[0008] Compared with the prior art, the optical lens provided by the present invention uses five lenses with specific optical powers and a specific combination of surface shapes, which enables the lens to have a longer focal length while meeting the requirements of high pixels; at the same time, by reasonably controlling the lens thickness and the distance between lenses, the structure of the lens is relatively compact and has a smaller overall length; due to the lens having a longer focal length and higher pixels, it can achieve the effects of background blurring and long-distance high-definition imaging, and can well meet the needs of telephoto shooting. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of embodiments in conjunction with the accompanying drawings, where:

[0010] Figure 1 is a schematic structural diagram of the optical lens provided in the first embodiment of the present invention;

[0011] Figure 2 is a field curvature curve graph of the optical lens in the first embodiment of the present invention;

[0012] Figure 3 is an optical distortion curve graph of the optical lens in the first embodiment of the present invention;

[0013] Figure 4 is a lateral chromatic aberration curve graph of the optical lens in the first embodiment of the present invention;

[0014] Figure 5 is a schematic structural diagram of the optical lens provided in the second embodiment of the present invention;

[0015] Figure 6 is a field curvature curve graph of the optical lens in the second embodiment of the present invention;

[0016] Figure 7It is the optical distortion curve graph of the optical lens in the second embodiment of the present invention;

[0017] Figure 8 It is the vertical chromatic aberration curve graph of the optical lens in the second embodiment of the present invention;

[0018] Figure 9 It is the structural schematic diagram of the optical lens provided by the third embodiment of the present invention;

[0019] Figure 10 It is the field curvature curve graph of the optical lens in the third embodiment of the present invention:

[0020] Figure 11 It is the optical distortion curve graph of the optical lens in the third embodiment of the present invention;

[0021] Figure 12 It is the vertical chromatic aberration curve graph of the optical lens in the third embodiment of the present invention. Detailed embodiments

[0022] To make the objectives, features, and advantages of the present invention more obvious and understandable, the following will provide a detailed description of the specific embodiments of the present invention with reference to the accompanying drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. Throughout the specification, the same reference numerals refer to the same elements. <*

[0024] In this document, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0025] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will refer to the accompanying drawings and combine the embodiments to detail this application.

[0026] The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a filter.

[0027] The first lens may have a positive optical power, with its object side being convex and its image side being concave; the second lens may have a negative optical power, with both its object side and image side being concave; the third lens may have a negative optical power, with its object side being convex and its image side being concave; the fourth lens may have a positive optical power, with both its object side and image side being convex; the fifth lens may have a negative optical power, with its object side being concave and its image side being convex; by reasonably allocating the focal lengths and surface profiles of the first to fifth lenses, the deflection angle of light can be effectively reduced, the optical aberration sensitivity of each lens can be decreased, and the imaging quality of the optical system can be improved.

[0028] The optical lens provided by the present invention uses five lenses with specific optical powers and specific surface shape combinations, enabling the lens to have a long focal length while meeting high pixel requirements; at the same time, by reasonably controlling the lens thickness and the distance between lenses, the structure of the lens is relatively compact, better meeting the usage requirements of portable electronic devices.

[0029] In some embodiments, the optical lens satisfies the following conditional expressions:

[0030] 0.12 < CT12 / DT < 0.2;

[0031] Wherein, CT12 represents the air spacing between the first lens and the second lens on the optical axis, and DT represents the distance on the optical axis from the object side of the first lens to the image side of the fifth lens. Meeting the above range can slow down the deflection trend of light between the first and second lenses, facilitating the balance of the long focal length and high pixels of the lens, and at the same time being able to shorten the total length of the optical lens to achieve the miniaturization of the lens.

[0032] In some embodiments, the optical lens satisfies the following conditional expressions:

[0033] 0 < R1 / R2 < 0.2;

[0034] Wherein, R1 represents the curvature radius of the object side of the first lens, and R2 represents the curvature radius of the image side of the first lens. Meeting the above range can reduce the axial aberration of the system, facilitating the achievement of high-definition effects in long-distance shooting of the lens and better realizing the telephoto characteristics.

[0035] In some embodiments, the optical lens satisfies the following conditional expressions:

[0036] -5 < f / f2 < -2;

[0037] -6 < R3 / R4 < -1;

[0038] Wherein, f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R3 represents the curvature radius of the object side of the second lens, and R4 represents the curvature radius of the image side of the second lens. Meeting the above ranges, making the second lens a double concave negative lens, can slow down the bending degree of the light entering the second lens, which is beneficial to correcting the optical distortion of the optical lens and improving the overall imaging quality.

[0039] In some embodiments, the optical lens satisfies the following conditional expressions:

[0040] -0.2 < f / f3 < 0;

[0041] 1 < R5 / R6 < 2;

[0042] Wherein, f3 represents the focal length of the third lens, f represents the effective focal length of the optical lens, R5 represents the curvature radius of the object side of the third lens, and R6 represents the curvature radius of the image side of the third lens. Meeting the above ranges, making the third lens have appropriate optical power and surface shape, is beneficial to correcting field curvature and improving the resolution quality of the optical lens.

[0043] In some embodiments, the optical lens satisfies the following conditional expressions:

[0044] 1.5 < f / f4 < 5;

[0045] Wherein, f4 represents the focal length of the fourth lens, and f represents the effective focal length of the optical lens. Meeting the above ranges is beneficial to slowing down the deflection degree of the light in the fourth lens, reducing the sensitivity of this lens, enabling the lens to have a good correction ability for high-order aberrations, and thus better achieving the balance of long focal length and high pixel of the lens.

[0046] In some embodiments, the optical lens satisfies the following conditional expressions:

[0047] -2 < R7 / R8 < -0.1;

[0048] 0.2 < R7 / f < 0.8;

[0049] Wherein, f represents the effective focal length of the optical lens, R7 represents the curvature radius of the object side of the fourth lens, and R8 represents the curvature radius of the image side of the fourth lens. Meeting the above ranges can control the deflection angle of the edge field of view in the fourth lens. On the one hand, it can reduce the sensitivity of the system, and on the other hand, it can reduce the inclination angle of the edge of the object side of the fourth lens, eliminating the risk of ghosting generated here.

[0050] In some embodiments, the optical lens satisfies the following conditional expressions:

[0051] -1.1 < f / f5 < -0.5;

[0052] 0.1 < R9 / R10 < 0.8;

[0053] Among them, f5 represents the focal length of the fifth lens, f represents the effective focal length of the optical lens, R9 represents the curvature radius of the object side of the fifth lens, and R10 represents the curvature radius of the image side of the fifth lens. Meeting the above range can make the fifth lens have appropriate negative refractive power, which is beneficial to increasing the incident angle of light on the imaging surface and better realizing the large image surface imaging effect of the lens.

[0054] In some embodiments, the optical lens satisfies the following conditional formula:

[0055] 0 < f2 / f3 < 0.1;

[0056] Among them, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens. Meeting the above range can balance the aberration of the system by reasonably distributing the focal length ratio of the second and third lenses, enabling the optical system to have an imaging quality with high pixels.

[0057] In some embodiments, the optical lens satisfies the following conditional formula:

[0058] -0.8 < f4 / f5 < -0.3;

[0059] Among them, f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens. Meeting the above range is beneficial to correcting the high-order aberration of the optical lens by reasonably matching the focal lengths of the fourth and fifth lenses, and realizing high-pixel imaging of the lens.

[0060] In some embodiments, the optical lens satisfies the following conditional formula:

[0061] 3.5 < f / IH < 4.0;

[0062] 14mm < f < 18mm;

[0063] FOV < 30°;

[0064] Among them, f represents the effective focal length of the optical lens, IH represents the image height corresponding to the half field of view angle of the optical lens, and FOV represents the maximum half field of view angle of the optical lens. Meeting the above range can better realize the balance between the telephoto and large image surface of the lens by reasonably controlling the relationship between the effective focal length and the image height of the lens. Therefore, when shooting with the lens, while achieving the effects of background blurring and long-distance imaging, it can also ensure the high-definition quality of the picture.

[0065] In some embodiments, the optical lens satisfies the following conditional formula:

[0066] 0.4 < BFL / TTL < 0.5;

[0067] Wherein, BFL represents the air spacing on the optical axis from the image side of the fifth lens to the imaging surface, and TTL represents the overall optical length of the optical lens. Meeting the above range, by reasonably distributing the back focal length of the optical system, it is beneficial to reduce the length of the optical system, while reducing the installation interference between the lens and the chip and improving the assembly yield.

[0068] In some embodiments, the optical lens satisfies the following conditional formula:

[0069] 9mm < (f × IH) / f1 < 11mm;

[0070] Wherein, f represents the effective focal length of the optical lens, IH represents the image height corresponding to the half field of view angle of the optical lens, and f1 represents the focal length of the first lens. Meeting the above range, by reasonably controlling the value of (f × IH) / f1, it is beneficial to obtain a larger system focal length, while being beneficial to obtaining a larger imaging surface. A larger imaging surface means that higher image resolution may be provided, enabling the lens to match a higher pixel chip and achieving a high pixel imaging effect.

[0071] In some embodiments, the optical lens satisfies the following conditional formula:

[0072] 0.08 < (CT23 + CT34 + CT45) / TTL < 0.1;

[0073] Wherein, CT23 represents the air spacing on the optical axis between the second lens and the third lens, CT34 represents the air spacing on the optical axis between the third lens and the fourth lens, CT45 represents the air spacing on the optical axis between the fourth lens and the fifth lens, and TTL represents the overall optical length of the optical lens. Meeting the above range, by reasonably distributing the air gaps between the lenses, the distance between the lenses is neither too close nor too far, which is beneficial to reducing the sensitivity of the air gaps and reducing the lens processing tolerance.

[0074] In some embodiments, the optical lens satisfies the following conditional formula:

[0075] -0.4 < (R7 + R8) / f < 0.1;

[0076] Wherein, R7 represents the curvature radius of the object side of the fourth lens, R8 represents the curvature radius of the image side of the fourth lens, and f represents the effective focal length of the optical lens. Meeting the above range, by reasonably controlling the biconvex shape of the fourth lens, it is beneficial to converge the light, reduce the incident angle of the chief ray, and is beneficial to achieving the effect of a long focal length.

[0077] In some embodiments, the optical lens satisfies the following conditional formula:

[0078] 0.3 < (SAG31 + SAG32) / CT3 < 0.6;

[0079] Wherein, SAG31 represents the sagittal height of the object side of the third lens at the effective aperture, SAG32 represents the sagittal height of the image side of the third lens at the effective aperture, and CT3 represents the central thickness of the third lens. Meeting the above range, by reasonably controlling the surface profiles of both sides of the third lens, the lens will not be overly curved, which is beneficial to the processing and forming of the lens.

[0080] In some embodiments, the optical lens satisfies the following conditional formula:

[0081] 0.09 < SAG52 / DM52 < 0.13;

[0082] Wherein, SAG52 represents the marginal sagittal height of the image side of the fifth lens, and DM52 represents the effective aperture of the image side of the fifth lens. Meeting the above range can reasonably control the surface profile of the image side of the fifth lens, which is beneficial to reducing the generation of ghost images or reducing the ghost image energy, and at the same time is beneficial to achieving the large image plane and long focal length performance of the lens.

[0083] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens all adopt aspherical lenses. Adopting aspherical lenses can effectively correct aberrations, improve imaging quality, and provide optical performance products with higher cost performance.

[0084] In each embodiment of the present invention, when the lenses in the optical lens adopt aspherical lenses, the surface shapes of the aspherical lenses all satisfy the following equation:

[0085]

[0086] Wherein, z is the sagittal height from the vertex of the aspherical surface at the position with a height of h along the optical axis direction, c is the paraxial curvature of the surface, k is the conic coefficient conic, A 2i is the aspherical surface coefficient of the 2i-th order.

[0087] The present invention will be further described below with multiple embodiments. In each embodiment, the thicknesses, curvature radii, and material selections of the respective lenses in the optical lens are somewhat different. For specific differences, please refer to the parameter tables of the respective embodiments. The following embodiments are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following embodiments. Any other changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be regarded as equivalent replacement methods and are all included in the protection scope of the present invention.

[0088] First Embodiment

[0089] Please refer to Figure 1, which shows a schematic structural diagram of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 sequentially includes, along the optical axis from the object side to the imaging surface S13: a diaphragm ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.

[0090] The first lens L1 has a positive focal power. The object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface; the second lens L2 has a negative focal power. The object side surface S3 of the second lens is a concave surface, and the image side surface S4 of the second lens is a concave surface; the third lens L3 has a negative focal power. The object side surface S5 of the third lens is a convex surface, and the image side surface S6 of the third lens is a concave surface; the fourth lens L4 has a positive focal power. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface; the fifth lens L5 has a negative focal power. The object side surface S9 of the fifth lens is a concave surface, and the image side surface S10 of the fifth lens is a convex surface; the object side surface of the filter G1 is S11 and the image side surface is S12. Among them, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 are all plastic aspherical lenses.

[0091] The relevant parameters of each lens in the optical lens 100 provided in the first embodiment of the present invention are shown in Table 1.

[0092] Table 1

[0093]

[0094]

[0095] The aspherical surface coefficients of each aspherical surface of the optical lens 100 in this embodiment are shown in Table 2.

[0096] Table 2

[0097]

[0098] Figure 2 Shows the field curvature curve of the optical lens 100 in this embodiment, which represents the bending degree of the meridional image plane and the sagittal image plane. It can be seen from the figure that the field curvature of the two-direction image planes is controlled within ±0.1 mm, indicating that the field curvature correction of the optical lens 100 is good.

[0099] Figure 3 Shows the F-Tan(θ) distortion curve of the optical lens 100 in this embodiment, which represents the distortion at different image heights on the imaging surface. It can be seen from the figure that the optical distortion is controlled within ±1.2%, indicating that the distortion of the optical lens 100 is well corrected.

[0100] Figure 4The vertical chromatic aberration curve of the optical lens 100 in this embodiment is shown, which represents the vertical chromatic aberration values between lights of different wavelengths and the principal wavelength. It can be seen from the figure that the vertical chromatic aberration values of each wavelength are within ±1.0 μm, indicating that the vertical chromatic aberration of the optical lens 100 is well corrected.

[0101] Second Embodiment

[0102] Please refer to Figure 5 , which shows the structural schematic diagram of the optical lens 200 provided in the first embodiment of the present invention. The optical lens 200 in this embodiment is substantially the same as the above-mentioned first embodiment, and the main differences lie in the curvature radii of each lens surface type, lens thickness, spacing, etc.

[0103] Specifically, the relevant parameters of each lens in the optical lens 200 of this embodiment are shown in Table 3.

[0104] Table 3

[0105]

[0106] The surface type coefficients of each aspherical surface of the optical lens 200 in this embodiment are shown in Table 4.

[0107] Table 4

[0108]

[0109] In this embodiment, the field curvature graph, optical distortion graph, and vertical chromatic aberration graph of the optical lens 200 are respectively as shown in Figure 6 , Figure 7 and Figure 8 . It can be seen from Figure 6 that the field curvature of the image planes in two directions is controlled within ±0.1 mm, indicating that the field curvature of the optical lens 200 is well corrected. It can be seen from Figure 7 that the optical distortion is controlled within ±1.0%, indicating that the distortion of the optical lens 200 is well corrected. It can be seen from Figure 8 that the vertical chromatic aberration values of each wavelength are within ±1.2 μm, indicating that the vertical chromatic aberration of the optical lens 200 is well corrected.

[0110] Third Embodiment

[0111] Please refer to Figure 9 , which shows the structural schematic diagram of the optical lens 300 provided in the first embodiment of the present invention. The optical lens 300 in this embodiment is substantially the same as the above-mentioned first embodiment, and the main differences lie in the curvature radii of each lens surface type, lens thickness, spacing, etc.

[0112] Specifically, the relevant parameters of each lens in the optical lens 300 of this embodiment are shown in Table 5

[0113] Table 5

[0114]

[0115]

[0116] The surface shape coefficients of the aspherical surfaces of the optical lens 300 in this embodiment are shown in Table 6.

[0117] Table 6

[0118]

[0119] In this embodiment, the field curvature graph, optical distortion graph, and lateral chromatic aberration graph of the optical lens 300 are respectively as Figure 10 , Figure 11 and Figure 12 shown. It can be seen from Figure 10 that the field curvature of the image planes in two directions is controlled within ±0.07 mm, indicating that the field curvature correction of the optical lens 300 is good. It can be seen from Figure 11 that the optical distortion is controlled within ±0.7%, indicating that the distortion of the optical lens 300 is well corrected. It can be seen from Figure 12 that the lateral chromatic aberration values of each wavelength are within ±1.0 μm, indicating that the lateral chromatic aberration of the optical lens 300 is well corrected.

[0120] Table 7 shows the optical characteristics corresponding to the above three embodiments, mainly including the effective focal length f of the system, the f-number F#, the total optical length TTL, the maximum field of view angle FOV, and the image height IH corresponding to the half field of view angle, as well as the values corresponding to each of the above conditional expressions.

[0121] Table 7

[0122] Example 1 Example 2 Example 3 f (mm) 15.98 15.98 15.993 F# 3.35 3.35 3.35 TTL (mm) 15.16 14.86 15.35 FOV (°) 28.2 28.2 28.2 IH (mm) 4.365 4.363 4.355 CT12 / DT 0.149 0.150 0.131 R1 / R2 0.094 0.087 0.128 f / f2 -2.789 -2.833 -2.766 R3 / R4 -2.073 -2.092 -4.004 f / f3 -0.077 0.000 -0.117 R5 / R6 1.177 1.147 1.164 f / f4 2.324 2.089 2.287 R7 / R8 -1.054 -0.577 -0.620 R7 / f 0.558 0.478 0.448 f / f5 -0.983 -0.813 -1.060 R9 / R10 0.559 0.544 0.542 f2 / f3 0.028 0.000 0.042 f4 / f5 -0.423 -0.389 -0.464 BFL / TTL 0.482 0.464 0.492 (f × IH) / f1 9.289 9.998 10.571 (CT23 + CT34 + CT45) / TTL 0.085 0.092 0.085 (R7 + R8) / f 0.029 -0.351 -0.274 (SAG31 + SAG32) / CT3 0.594 0.593 0.379 SAG52 / DM52 0.105 0.129 0.092

[0123] In summary, the optical lens provided by the present invention uses five aspherical lenses with specific optical powers. Through specific surface shape matching and reasonable optical power distribution, while meeting high pixels, the lens has a long focal length; at the same time, by reasonably controlling the lens thickness and the distance between lenses, the structure of the lens is relatively compact and has a small total length; due to the long focal length and high pixels of the lens, the effects of background blurring and long-distance high-definition imaging can be achieved, which can well meet the requirements of telephoto shooting; at the same time, by reasonably configuring the distance between lenses, no spacer rings are required between the lenses, reducing the use of single components, avoiding spacer ring stray light, saving costs, and improving the imaging quality.

[0124] In the description of this specification, the description referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0125] The above-described embodiments merely represent several implementation manners of the present invention. Their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An optical lens, which is composed of five lenses, is characterized in that It sequentially includes, from the object side to the imaging surface along the optical axis: A diaphragm; A first lens with a positive optical power, the object side surface of the first lens being convex and the image side surface of the first lens being concave; A second lens with a negative optical power, both the object side surface and the image side surface of the second lens being concave; A third lens with a negative optical power, the object side surface of the third lens being convex and the image side surface of the third lens being concave; A fourth lens with a positive optical power, both the object side surface and the image side surface of the fourth lens being convex; A fifth lens with a negative optical power, the object side surface of the fifth lens being concave and the image side surface of the fifth lens being convex; The optical lens satisfies the following conditional expressions: 0.12 < CT12 / DT < 0.2; Wherein, CT12 represents the air spacing between the first lens and the second lens on the optical axis, and DT represents the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 0 < R1 / R2 < 0.2; Wherein, R1 represents the radius of curvature of the object side surface of the first lens, and R2 represents the radius of curvature of the image side surface of the first lens.

3. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: -5 < f / f2 < -2; -6 < R3 / R4 < -1; Wherein, f2 represents the focal length of the second lens, f represents the effective focal length of the optical lens, R3 represents the radius of curvature of the object side surface of the second lens, and R4 represents the radius of curvature of the image side surface of the second lens.

4. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: -0.2 < f / f3 < 0; 1 < R5 / R6 < 2; Wherein, f3 represents the focal length of the third lens, f represents the effective focal length of the optical lens, R5 represents the radius of curvature of the object side surface of the third lens, and R6 represents the radius of curvature of the image side surface of the third lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 1.5 < f / f4 < 5; Wherein, f4 represents the focal length of the fourth lens, and f represents the effective focal length of the optical lens.

6. The optical lens according to claim 1, characterized in that The optical lens satisfies the following conditional expressions: -2 < R7 / R8 < -0.1; 0.2 < R7 / f < 0.8; Wherein, f represents the effective focal length of the optical lens, R7 represents the radius of curvature of the object side surface of the fourth lens, and R8 represents the radius of curvature of the image side surface of the fourth lens.

7. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: -1.1 < f / f5 < -0.5; 0.1 < R9 / R10 < 0.8; Wherein, f5 represents the focal length of the fifth lens, f represents the effective focal length of the optical lens, R9 represents the radius of curvature of the object side surface of the fifth lens, and R10 represents the radius of curvature of the image side surface of the fifth lens.

8. The optical lens according to claim 1, wherein The optical lens satisfies the following conditional expressions: 0 < f2 / f3 < 0.1; Wherein, f2 represents the focal length of the second lens, and f3 represents the focal length of the third lens.

9. The optical lens according to claim 1, wherein [[ID=?]]The optical lens satisfies the following conditional expressions: -0.8 < f4 / f5 < -0.3; Wherein, f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional expressions: 14mm < f < 18mm; FOV < 30°; Wherein, f represents the effective focal length of the optical lens, and FOV represents the maximum field of view angle of the optical lens.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following conditional formula: 0.4 < BFL / TTL < 0.5; Wherein, BFL represents the air spacing on the optical axis from the image side of the fifth lens to the imaging surface, and TTL represents the overall optical length of the optical lens.

12. The optical lens according to claim 1, wherein, The optical lens satisfies the following conditional formula: 9mm < (f × IH) / f1 < 11mm; Wherein, f represents the effective focal length of the optical lens, IH represents the image height corresponding to the half field of view angle of the optical lens, and f1 represents the focal length of the first lens.

Images