Optical lens

Abstract

The application discloses an optical lens, which comprises, along an optical axis from an object side to an imaging surface, a first lens with negative focal length, the object side of which is a convex surface and the image side is a concave surface; a diaphragm; a second lens with positive focal length, the object side and the image side of which are both convex surfaces; a third lens with negative focal length, the object side of which is a concave surface near the optical axis and the image side is a concave surface; a fourth lens with positive focal length, the object side and the image side of which are both convex surfaces; and a fifth lens with negative focal length, the object side of which is a concave surface and the image side is a convex surface; wherein the optical lens comprises at least one glass lens. The optical lens provided by the application adopts a mixed combination of glass lenses and plastic lenses, and through reasonable distribution of the surface shape and the focal length of each lens, the optical lens has the advantages of wide field of view, short total length, small head outer diameter and high pixels.

Description

Technical Field

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

[0002] In recent years, with the rapid development of science and technology, the demand for optical lenses in all walks of life has been increasing day by day. In particular, with the rapid development of emerging optical industries such as the VR / AR industry, users have put forward higher requirements for imaging devices in the VR / AR field, and the requirements for the imaging quality of the lenses paired with them are also getting higher and higher.

[0003] Since VR / AR imaging devices are more commonly used in head-mounted products and portable electronic products, it is required that the lens has a small volume and a large field angle to capture some information in a large range. In order to more accurately restore this information through the VR / AR imaging device, the lens is required to have a small distortion. However, the optical lenses used in the prior art generally have disadvantages such as a small field angle, low pixels, and a large volume, and cannot meet the requirements of large wide-angle, high pixels, and miniaturization at the same time. Summary of the Invention

[0004] Based on this, the object of the present invention is to provide an optical lens, which at least has the advantages of a small outer diameter of the head, a short total length, a large field angle, and high pixels.

[0005] The present invention realizes the above object of the invention through the following technical solutions.

[0006] The present invention provides an optical lens, which sequentially includes, along the optical axis from the object side to the imaging surface: a first lens with a negative optical power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; an aperture stop; a second lens with a positive optical power, the object side surface and the image side surface of the second lens are both convex surfaces; a third lens with a negative optical power, the object side surface of the third lens is a concave surface at the axis, and the image side surface of the third lens is a concave surface; a fourth lens with a positive optical power, the object side surface and the image side surface of the fourth lens are both convex surfaces; a fifth lens with a negative optical power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; wherein, at least one glass lens is included in the optical lens; the optical lens satisfies the following conditional expressions: 2.5mm < TTL < 3mm; 1.2 < IH / f < 1.6; where, TTL represents the overall optical length of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual semi-image height of the optical lens on the imaging surface.

[0007] Compared to existing technologies, the optical lens provided by this invention employs a hybrid combination of glass and plastic lenses. By designing the surface shape of each lens and rationally allocating their optical power, the lens achieves advantages such as a wide field of view, short overall length, small head diameter, and high pixel count. Simultaneously, by rationally controlling the lens thickness and inter-lens distance, spacers are eliminated from the need for support between lenses, reducing the use of individual components, saving costs, avoiding stray light interference from spacers, improving image quality, and reducing processing sensitivity. Attached Figure Description

[0008] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0009] Figure 1 This is a schematic diagram of the structure of an optical lens provided in the first embodiment of the present invention;

[0010] Figure 2 This is a field curvature curve diagram of the optical lens in the first embodiment of the present invention;

[0011] Figure 3 This is an f-θ distortion curve of the optical lens in the first embodiment of the present invention;

[0012] Figure 4 This is a chromatic aberration curve of the optical lens in the first embodiment of the present invention;

[0013] Figure 5 This is a field curvature curve diagram of the optical lens in the second embodiment of the present invention;

[0014] Figure 6 This is an f-θ distortion curve of the optical lens in the second embodiment of the present invention;

[0015] Figure 7 This is a diagram showing the chromatic aberration curve of the optical lens in the second embodiment of the present invention.

[0016] Figure 8 Here is a field curvature curve of the optical lens in the third embodiment of the present invention:

[0017] Figure 9 This is an f-θ distortion curve of the optical lens in the third embodiment of the present invention;

[0018] Figure 10 This is a diagram showing the transverse chromatic aberration curve of the optical lens in the third embodiment of the present invention;

[0019] Figure 11 Here is a field curvature curve of the optical lens in the fourth embodiment of the present invention:

[0020] Figure 12This is an f-θ distortion curve of the optical lens in the fourth embodiment of the present invention;

[0021] Figure 13 This is a chromatic aberration curve of the optical lens in the fourth embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Throughout this specification, the same reference numerals refer to the same elements.

[0024] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] The present invention proposes an optical lens, which includes, in sequence along the optical axis from the object side to the imaging plane: a first lens, an aperture stop, a second lens, a third lens, a fourth lens, a fifth lens, and a filter.

[0027] The first lens has negative optical power, its object side is convex, and its image side is concave. The first lens adopts a negative meniscus lens, which is conducive to obtaining a larger field of view, increasing the amount of light entering the optical system, and realizing wide-angle imaging of the lens.

[0028] The second lens has positive optical power, and both its object side and image side are convex. The second lens is a biconvex positive optical power lens, which helps to balance the off-axis aberrations brought by the first lens, reduce the difficulty of aberration correction, and at the same time can better converge the edge field of view light, so that the light enters the subsequent system more smoothly.

[0029] The third lens has negative optical power, and its object side is concave near the optical axis, while its image side is also concave.

[0030] The fourth lens has positive optical power, and both its object side and image side are convex. The fourth lens is a biconvex lens, which helps to increase the imaging area of ​​the lens, balance various aberrations of the lens, and improve the overall imaging quality.

[0031] The fifth lens has negative optical power, with a concave object side and a convex image side. The concave-convex shape of the fifth lens is beneficial for converging light rays from the edge of the field of view and increasing the imaging area of ​​the lens.

[0032] All five lenses mentioned above can be made of glass or plastic. In order to achieve a balance between high-quality imaging and miniaturization, a combination of glass and plastic lenses can also be used. Since glass lenses have better light transmission, less dispersion, and higher refractive index, they can effectively correct chromatic aberration and shorten the overall system length. Therefore, a glass-plastic hybrid lens that combines glass and plastic lenses can better improve the lens's resolution, reduce the overall system length, and also improve the lens's thermal stability.

[0033] In one embodiment of the invention, the first lens is a glass lens, which effectively corrects the geometric chromatic aberration of the optical system by utilizing the low dispersion characteristic of glass. The second, third, fourth, and fifth lenses are all plastic lenses, which can effectively reduce costs, correct aberrations, and provide optical performance products with higher cost-effectiveness. This invention achieves a compact structure by reasonably constraining the surface shape and optical power of each lens, resulting in a large field of view, small head outer diameter, small overall length, and high pixel count.

[0034] In some embodiments, the optical lens satisfies the following condition:

[0035] 2.5mm <TTL<3mm;

[0036] 1.2 <IH / f<1.6;

[0037] Wherein, TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual half-image height of the optical lens on the imaging plane. Satisfying the above ranges is beneficial for achieving a balance between the wide-angle capability and miniaturization of the optical lens.

[0038] In some embodiments, the optical lens satisfies the following condition:

[0039] FOV > 150°;

[0040] 50° < (f × FOV) / IH < 65°;

[0041] Wherein, FOV represents the maximum field of view of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual half-image height of the optical lens on the imaging plane. Meeting the above ranges enables the optical lens to have a large field of view while maintaining low distortion, allowing for the capture of large scenes with good edge imaging effects, thus well meeting the photography requirements of VR / AR imaging devices.

[0042] In some embodiments, the optical lens satisfies the following condition:

[0043] -0.1 < (f1 + f2) / f < 0.5;

[0044] Where f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f represents the effective focal length of the optical lens. Meeting the above range allows the first and second lenses to jointly achieve a convergence effect on large-angle light, expanding the lens's field of view. Simultaneously, it better converges edge-field light, allowing light to enter the subsequent system more smoothly, reducing the deflection angle borne by the rear lens, and facilitating a balance between ultra-wide-angle and high-pixel count.

[0045] In some embodiments, the optical lens satisfies the following condition:

[0046] 5 <R1 / R2<30;

[0047] Where 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. Satisfying the above range is beneficial for achieving ultra-wide-angle characteristics, thereby enabling the acquisition of more scene information and meeting the needs of the lens for wide-range imaging.

[0048] In some embodiments, the optical lens satisfies the following condition:

[0049] -1 <R9 / f<-0.1;

[0050] -2 <R10 / f<-0.5;

[0051] Wherein, 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. By satisfying the above ranges and setting the fifth lens as a negative meniscus lens, it is beneficial to balance astigmatism and field curvature of the optical lens, thereby improving the imaging quality of the optical lens.

[0052] In some embodiments, the optical lens satisfies the following condition:

[0053] -2.5 <f3 / f<-0.5;

[0054] -5 <R5 / R6<-0.5;

[0055] Where f3 represents the focal length of the third 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. Meeting these ranges allows the third lens to have suitable optical power and surface shape, which is beneficial for correcting field curvature and improving the resolving quality of the optical lens.

[0056] In some embodiments, the optical lens satisfies the following condition:

[0057] 1.1 <BFL / f<1.3;

[0058] Wherein, BFL represents the air gap on the optical axis between the image-side surface of the fifth lens and the imaging surface, and f represents the effective focal length of the optical lens. Meeting the above range is beneficial for rationally controlling the back focal length of the lens. On the one hand, it improves the matching degree between the lens and the imaging chip, reduces interference between the lens and the module, and improves the assembly yield. On the other hand, it helps to reduce the length of the optical system and achieve lens miniaturization.

[0059] In some embodiments, the optical lens satisfies the following condition:

[0060] 0.8 <D11 / D52<0.9;

[0061] 0.60 <D11 / IH<0.65;

[0062] Wherein, D11 represents the effective aperture of the object-side surface of the first lens, and D52 represents the effective aperture of the image-side surface of the fifth lens. Meeting the above range, by reasonably setting the effective apertures of the first and last lenses, facilitates minimizing the outer diameter of the lens head, enabling a minimum head size of 2.5mm, which is beneficial for lens structural design and miniaturization.

[0063] In some embodiments, the optical lens satisfies the following condition:

[0064] -1 <f1 / f<-0.5;

[0065] 0.5 <f2 / f<1.5;

[0066] Where f1 represents the focal length of the first lens, f2 represents the focal length of the second lens, and f represents the effective focal length of the optical lens. By satisfying the above range and reasonably allocating the optical power of the first and second lenses, the angle of incident light from the lens is made larger, which is beneficial for achieving ultra-wide-angle shooting.

[0067] In some embodiments, the optical lens satisfies the following condition:

[0068] -3 <f3 / f4<-0.5;

[0069] -0.8 <f4 / f5<-0.1;

[0070] Where f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens. Meeting the above ranges and rationally setting and allocating the optical power of the third, fourth, and fifth lenses helps to enhance coma correction in the off-axis field of view, while also effectively reducing field curvature and aberrations, giving the lens higher resolving power.

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

[0072] 0.07 <CT1 / TTL<0.085;

[0073] 0.07 <CT3 / TTL<0.08;

[0074] 0.07 <CT5 / TTL<0.08;

[0075] Wherein, CT1 represents the center thickness of the first lens, CT3 represents the center thickness of the third lens, CT5 represents the center thickness of the fifth lens, and TTL represents the total optical length of the optical lens. By satisfying the above range and appropriately setting the center thickness ratio of the three negative lenses, the thickness tolerance of the lens can be reduced, which is beneficial for lens manufacturing.

[0076] In some embodiments, the optical lens satisfies the following condition:

[0077] 0.04 < ET23 / TTL < 0.07;

[0078] 0.04 < ET34 / TTL < 0.07;

[0079] 0.01 < ET45 / TTL < 0.025;

[0080] Wherein, ET23 represents the air gap between the second and third lenses in the direction parallel to the optical axis at the effective aperture; ET34 represents the air gap between the third and fourth lenses in the direction parallel to the optical axis at the effective aperture; ET45 represents the air gap between the fourth and fifth lenses in the direction parallel to the optical axis at the effective aperture; and TTL represents the total optical length of the optical lens. Meeting the above ranges allows for reasonable control of the air gaps between the lenses at the edge of the effective aperture, eliminating the need for spacers between the lenses, thus saving costs and avoiding stray light introduced by spacers, thereby improving the image quality of the lens.

[0081] In some embodiments, the optical lens satisfies the following condition:

[0082] 0.8 <D22 / D31<1.0;

[0083] 0.5 <D31 / D52<0.65;

[0084] Where D22 represents the effective aperture of the image-side of the second lens, D31 represents the effective aperture of the object-side of the third lens, and D52 represents the effective aperture of the image-side of the fifth lens. Meeting these ranges allows for adjustment of the incident light angle in each field of view, effectively avoiding total internal reflection and further improving the lens's image quality.

[0085] In some embodiments, the optical lens satisfies the following condition:

[0086] 0.55 < ∑CT / TTL < 0.65;

[0087] Wherein, ∑CT represents the total thickness of the first to fifth lenses along the optical axis, and TTL represents the total optical length of the optical lens. Satisfying the above range allows for a more compact lens structure, better enabling lens miniaturization.

[0088] In some embodiments, the first lens is an aspherical lens. In other embodiments, the first lens can be a spherical lens. Different combinations of surface shapes for the first lens can all enable the system to achieve good imaging results.

[0089] In some implementations, the first lens is made of glass, while the second, third, fourth, and fifth lenses are all made of aspherical plastic lenses. Using a hybrid of glass and plastic lenses can effectively correct aberrations, improve image quality, and provide optical performance products with higher cost-effectiveness.

[0090] In various embodiments of the present invention, when the lens in the optical lens is an aspherical lens, the surface shape of the aspherical lens satisfies the following equation:

[0091]

[0092] Where z is the sag of the aspherical surface at a height of h along the optical axis from the vertex of the aspherical surface, c is the paraxial curvature of the surface, k is the conic coefficient, and A 2i For the aspherical surface shape coefficient of the 2ith order.

[0093] The present invention will be further described below with reference to several embodiments. In each embodiment, the thickness, radius of curvature, and material selection of each lens in the optical lens are different; for specific differences, please refer to the parameter tables of each embodiment. The following embodiments are merely preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following embodiments. Any changes, substitutions, combinations, or simplifications made without departing from the innovative points of the present invention should be considered equivalent substitutions and are included within the protection scope of the present invention.

[0094] First Embodiment

[0095] Please see Figure 1 The figure shown is a schematic diagram of the structure of the optical lens 100 provided in the first embodiment of the present invention. The optical lens 100 includes, along the optical axis from the object side to the imaging plane S13, the following components in sequence: a first lens L1, an aperture ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a filter G1.

[0096] The first lens L1 has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens L2 has positive optical power, with both its object-side surface S3 and image-side surface S4 being convex. The third lens L3 has negative optical power, with its object-side surface S5 being concave near the optical axis and its image-side surface S6 being concave. The fourth lens L4 has positive optical power, with both its object-side surface S7 and image-side surface S8 being convex. The fifth lens L5 has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The filter has an object-side surface S11 and an image-side surface S12. The first lens L1 is a glass aspherical lens, while the second, third, fourth, and fifth lenses L2, L3, L4, and L5 are all plastic aspherical lenses.

[0097] The relevant parameters of each lens element in the optical lens 100 provided in the first embodiment of the present invention are shown in Table 1.

[0098] Table 1

[0099]

[0100]

[0101] The surface shape coefficients of each aspherical surface of the optical lens 100 in this embodiment are shown in Table 2.

[0102] Table 2

[0103] Face number k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1 101.4376 9.800E-01 -4.758E+00 1.496E+01 -3.692E+01 -1.475E+01 3.608E+02 -6.235E+02 S2 -9.5577 2.627E+01 -2.892E+02 2.814E+03 1.796E+04 -8.810E+05 1.156E+07 -5.972E+07 S3 13.9098 5.834E-01 -4.268E+01 9.882E+02 -2.128E+04 1.491E+05 6.742E+05 -1.289E+07 S4 -7.2497 7.809E-01 -2.361E+01 -3.196E+02 1.972E+03 5.469E+04 -6.782E+05 2.292E+06 S5 -70.3545 1.340E+01 -2.004E+02 1.547E+03 -2.867E+03 -6.003E+04 4.759E+05 -1.139E+06 S6 2.0176 -2.927E+00 3.160E+01 -2.035E+02 2.413E+02 2.021E+03 -8.415E+03 7.518E+03 S7 -7.2738 -3.529E-01 3.599E+00 -3.358E+01 1.048E+02 4.733E+01 -1.849E+02 -8.702E+02 S8 -3.4316 2.743E+00 -4.002E+01 1.157E+02 8.714E+01 -4.668E+02 -1.191E+03 3.508E+03 S9 -0.6388 8.167E+00 -6.321E+01 1.996E+02 1.895E+02 -1.425E+03 -4.203E+02 4.711E+03 S10 -0.8336 1.401E+00 -8.854E+00 3.790E+01 -5.774E+01 5.754E+01 -1.974E+02 2.641E+02

[0104] In this embodiment, the field curvature curve, f-θ distortion diagram, and transverse chromatic aberration diagram of the optical lens 100 are respectively as follows: Figure 2 , Figure 3 and Figure 4 As shown.

[0105] Figure 2 The field curvature curve of the optical lens 100 in this embodiment is shown, which represents the curvature of the meridional image plane and the sagittal image plane. It can be seen from the figure that the field curvature of the image plane in both directions is controlled within ±0.10mm, indicating that the field curvature correction of the optical lens 100 is good.

[0106] Figure 3 The optical f-θ distortion curve of the optical lens 100 in this embodiment is shown, which represents the distortion at different image heights on the imaging plane. It can be seen from the figure that the f-θ distortion is controlled within ±4%, indicating that the distortion of the optical lens 100 is well corrected.

[0107] Figure 4 The transverse chromatic aberration curve of the optical lens 100 of this embodiment is shown, which represents the transverse chromatic aberration value between light of different wavelengths and the main wavelength. It can be seen from the figure that the transverse chromatic aberration value of each wavelength is within ±3.0μm, indicating that the transverse chromatic aberration of the optical lens 100 is well corrected.

[0108] Second Embodiment

[0109] The second embodiment of the present invention provides an optical lens 200. The optical lens 200 of this embodiment is generally the same as that of the first embodiment described above. The main difference is that the curvature radius, lens thickness, and spacing of each lens surface are different.

[0110] Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in Table 3.

[0111] Table 3

[0112]

[0113]

[0114] The surface coefficients of each aspherical surface of the optical lens 200 in this embodiment are shown in Table 4.

[0115] Table 4

[0116] Face number k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S1 87.8247 8.961E-01 -4.616E+00 1.540E+01 -3.636E+01 -1.643E+01 3.525E+02 -6.081E+02 S2 -9.4952 2.461E+01 -2.839E+02 2.777E+03 1.707E+04 -8.806E+05 1.173E+07 -5.826E+07 S3 13.5880 4.820E-01 -4.342E+01 9.862E+02 -2.125E+04 1.497E+05 6.810E+05 -1.296E+07 S4 -9.0842 7.420E-01 -2.515E+01 -3.295E+02 1.931E+03 5.471E+04 -6.755E+05 2.327E+06 S5 -108.7744 1.318E+01 -2.017E+02 1.544E+03 -2.872E+03 -5.998E+04 4.768E+05 -1.130E+06 S6 2.1241 -3.088E+00 3.204E+01 -2.021E+02 2.433E+02 2.019E+03 -8.448E+03 7.445E+03 S7 -6.4616 -1.979E-01 3.577E+00 -3.472E+01 1.010E+02 4.144E+01 -1.678E+02 -6.503E+02 S8 -3.4133 2.808E+00 -4.000E+01 1.152E+02 8.532E+01 -4.702E+02 -1.191E+03 3.535E+03 S9 -0.6334 8.174E+00 -6.324E+01 1.995E+02 1.894E+02 -1.425E+03 -4.175E+02 4.708E+03 S10 -1.0939 1.438E+00 -8.743E+00 3.799E+01 -5.796E+01 5.641E+01 -1.995E+02 2.675E+02

[0117] In this embodiment, the field curvature curve, f-θ distortion diagram, and transverse chromatic aberration diagram of the optical lens 200 are respectively as follows: Figure 5 , Figure 6 and Figure 7 As shown.

[0118] from Figure 5 It can be seen that the field curvature of the image plane in both directions is controlled within ±0.15mm, indicating that the field curvature correction of the optical lens 200 is good.

[0119] from Figure 6 As can be seen, the f-θ distortion is controlled within ±4%, indicating that the distortion of the optical lens 200 has been well corrected.

[0120] from Figure 7It can be seen that the transverse chromatic difference values ​​of each wavelength are within ±3.0μm, indicating that the transverse chromatic difference of the optical lens 200 is well corrected.

[0121] Third Embodiment

[0122] The third embodiment of the present invention provides an optical lens 300. The optical lens 300 of this embodiment is generally the same as that of the first embodiment described above. The main difference is that the first lens L1 is a glass spherical lens, and the curvature radius, lens thickness, spacing, etc. of each lens surface are different.

[0123] Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in Table 5.

[0124] Table 5

[0125]

[0126] The surface coefficients of each aspherical surface of the optical lens 300 in this embodiment are shown in Table 6.

[0127] Table 6

[0128]

[0129]

[0130] In this embodiment, the field curvature curve, f-θ distortion diagram, and transverse chromatic aberration diagram of the optical lens 300 are respectively as follows: Figure 8 , Figure 9 , Figure 10 As shown.

[0131] from Figure 8 It can be seen that the field curvature of the image plane in both directions is controlled within ±0.15mm, indicating that the field curvature correction of the optical lens 300 is good.

[0132] from Figure 9 As can be seen, the f-θ distortion is controlled within ±4%, indicating that the distortion of the 300 optical lens has been well corrected.

[0133] from Figure 10 It can be seen that the transverse chromatic difference values ​​of each wavelength are within ±2.0μm, indicating that the transverse chromatic difference of the optical lens 300 is well corrected.

[0134] Fourth embodiment

[0135] The fourth embodiment of the present invention provides an optical lens 400. The optical lens 400 of this embodiment is generally the same as that of the first embodiment described above. The main difference is that the first lens L1 is a glass spherical lens, and the curvature radius, lens thickness, spacing, etc. of each lens surface are different.

[0136] Specifically, the design parameters of the optical lens 400 provided in this embodiment are shown in Table 7.

[0137] Table 7

[0138]

[0139]

[0140] The surface coefficients of each aspherical surface of the optical lens 400 in this embodiment are shown in Table 8.

[0141] Table 8

[0142] Face number k <![CDATA[A4]]> <![CDATA[A6]]> <![CDATA[A8]]> <![CDATA[A 10 ]]> <![CDATA[A 12 ]]> <![CDATA[A 14 ]]> <![CDATA[A 16 ]]> S3 2.1170 1.544E+00 -1.267E+02 3.482E+03 -5.478E+04 1.540E+05 5.590E+06 -4.296E+07 S4 -6.8182 2.551E-01 -1.276E+02 6.808E+02 1.261E+03 1.286E+05 -2.459E+06 1.118E+07 S5 28.3186 1.407E+01 -3.390E+02 3.150E+03 -1.706E+03 -2.388E+05 1.824E+06 -4.083E+06 S6 2.2153 -1.538E+00 -1.805E+01 1.352E+01 3.323E+02 1.159E+03 -1.266E+04 6.745E+03 S7 -6.2857 1.003E+00 -5.754E+00 -2.727E+01 2.536E+02 -9.753E+02 4.642E+03 -1.001E+04 S8 -2.0130 3.743E+00 -4.770E+01 1.634E+02 5.362E+01 -1.043E+03 2.054E+02 3.572E+03 S9 -0.6272 1.065E+01 -7.323E+01 2.165E+02 6.629E+02 -4.026E+03 2.625E+03 9.140E+03 S10 -1.0579 4.480E+00 -2.451E+01 1.107E+02 -2.637E+02 4.442E+02 -8.746E+02 9.045E+02

[0143] In this embodiment, the field curvature curve, f-θ distortion diagram, and transverse chromatic aberration diagram of the optical lens 400 are respectively as follows: Figure 11 , Figure 12 , Figure 13 As shown.

[0144] from Figure 11 It can be seen that the field curvature of the image plane in both directions is controlled within ±0.2mm, indicating that the field curvature correction of the optical lens 400 is good.

[0145] from Figure 12 As can be seen, the f-θ distortion is controlled within ±3.0%, indicating that the distortion of the 400 optical lens has been well corrected.

[0146] from Figure 13 It can be seen that the transverse chromatic difference values ​​of each wavelength are within ±1.0μm, indicating that the transverse chromatic difference of the optical lens 400 is well corrected.

[0147] Table 9 shows the optical characteristics corresponding to the four embodiments above, mainly including the system's effective focal length f, aperture number F#, total optical length TTL, field of view FOV, and half-image height IH, as well as the values ​​corresponding to each of the above conditional expressions.

[0148] Table 9

[0149]

[0150]

[0151] In summary, the optical lens provided by this invention employs a hybrid combination of glass and plastic lenses. By designing the surface shape of each lens and rationally allocating their optical power, the lens achieves advantages such as a wide field of view, short overall length, small head size, and low distortion. Furthermore, by rationally controlling the lens thickness and inter-lens distance, spacers are not required between the lenses, reducing the use of individual components, saving costs, avoiding stray light interference from spacers, improving image quality, and reducing processing sensitivity.

[0152] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0153] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. An optical lens, characterized in that, Along the optical axis from the object side to the image side, the following are included in sequence: A first lens with negative optical power, wherein the object side of the first lens is convex and the image side of the first lens is concave. Aperture; A second lens with positive optical power, wherein both the object-side surface and the image-side surface of the second lens are convex. A third lens with negative optical power, wherein the object-side surface of the third lens is concave near the optical axis, and the image-side surface of the third lens is concave. A fourth lens with positive optical power, wherein both the object-side surface and the image-side surface of the fourth lens are convex. A fifth lens with negative optical power, wherein the object-side surface of the fifth lens is concave and the image-side surface of the fifth lens is convex; The optical lens includes at least one glass lens; The optical lens satisfies the following condition: 2.5mm <TTL<3mm; 1.2 <IH / f<1.6; Wherein, TTL represents the total optical length of the optical lens, f represents the effective focal length of the optical lens, and IH represents the actual half-image height of the optical lens on the imaging plane.

2. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: FOV > 150°; 50° < (f × FOV) / IH < 65°; Wherein, FOV represents the maximum field of view of the optical lens.

3. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -0.1 < (f1 + f2) / f < 0.5; Where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.

4. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 5 <R1 / R2<30; Wherein, R1 represents the radius of curvature of the object side of the first lens, and R2 represents the radius of curvature of the image side of the first lens.

5. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -1 <R9 / f<-0.1; -2 <R10 / f<-0.5; Wherein, R9 represents the radius of curvature of the object side of the fifth lens, and R10 represents the radius of curvature of the image side of the fifth lens.

6. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -2.5 <f3 / f<-0.5; -5 <R5 / R6<-0.5; Wherein, f3 represents the focal length of the third lens, R5 represents the radius of curvature of the object side of the third lens, and R6 represents the radius of curvature of the image side of the third lens.

7. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 1.1 <BFL / f<1.3; Wherein, BFL represents the air distance on the optical axis from the image side of the fifth lens to the imaging surface.

8. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.8 <D11 / D52<0.9; 0.60 <D11 / IH<0.65; Wherein, D11 represents the effective aperture of the object side of the first lens, and D52 represents the effective aperture of the image side of the fifth lens.

9. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -1 <f1 / f<-0.5; 0.5 <f2 / f<1.5; Where f1 represents the focal length of the first lens and f2 represents the focal length of the second lens.

10. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: -3 <f3 / f4<-0.5; -0.8 <f4 / f5<-0.1; Where f3 represents the focal length of the third lens, f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens.

11. The optical lens according to claim 1, characterized in that, The optical lens satisfies the following condition: 0.07 <CT1 / TTL<0.085; 0.07 <CT3 / TTL<0.08; 0.07 <CT5 / TTL<0.08; Wherein, CT1 represents the center thickness of the first lens, CT3 represents the center thickness of the third lens, and CT5 represents the center thickness of the fifth lens.

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