Optical lens

Abstract

The application provides an optical lens which is composed of six lenses and sequentially comprises, along an optical axis from an object side to an imaging surface, a first lens with negative optical power, the object side of which is a convex surface and the image side of which is a concave surface; a second lens with negative optical power, the object side of which is a concave surface and the image side of which is a convex surface; a third lens with positive optical power, the object side of which is a convex surface and the image side of which is a convex surface; a fourth lens with positive optical power, the object side of which is a convex surface and the image side of which is a convex surface; a fifth lens with negative optical power, the object side of which is a concave surface and the image side of which is a concave surface; and a sixth lens with positive optical power, the object side of which is a convex surface and the image side of which is a concave surface. The optical lens provided by the application can improve the imaging quality of the optical lens, reduce aberration and improve the imaging quality of the optical lens through specific surface shape matching and reasonable optical power distribution.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of imaging lenses, in particular to an optical lens. BACKGROUND

[0002] With the gradual improvement of intelligent driving, the vehicle-mounted camera as the "eyes of automatic driving" is the core sensor equipment. The development of vehicle-mounted camera gradually extends from the early use for driving record, reversing image, parking surround view to behavior recognition in the intelligent cabin and ADAS auxiliary driving.

[0003] As an extension of the driver monitoring system DMS, the cabin personnel monitoring system OMS can not only monitor the state of the driver, remind the dangerous behaviors of the driver such as fatigue driving, smoking and making a phone call, but also monitor the behaviors of other passengers in the vehicle, including whether the children are left in the vehicle, and the left-over objects in the vehicle. However, the existing OMS lens has the problems of small field of view angle and low imaging quality, and cannot well complete the monitoring of the state of the driver and the passengers. SUMMARY

[0004] In view of the above problems, the present application aims to provide an optical lens, which has the advantages of excellent imaging quality.

[0005] The technical scheme adopted by the present application is as follows:

[0006] An optical lens composed of six lenses, including, along the optical axis from the object side to the imaging surface:

[0007] A first lens with negative focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface;

[0008] A second lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a convex surface;

[0009] A third lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface;

[0010] A fourth lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a convex surface;

[0011] A fifth lens with negative focal power, the object side surface of which is a concave surface, and the image side surface of which is a concave surface;

[0012] A sixth lens with positive focal power, the object side surface of which is a convex surface, and the image side surface of which is a concave surface;

[0013] Wherein, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: -2.3 < f12 / f < -1.4.

[0014] It is further preferred that a combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens and an effective focal length f of the optical lens satisfy: 1.3 < f3456 / f < 1.6.

[0015] It is further preferred that a maximum field angle of the optical lens corresponds to a real image height IH and the effective focal length f of the optical lens satisfy: 2 < IH / f < 2.2.

[0016] It is further preferred that an optical total track length TTL of the optical lens and an aperture value Fno of the optical lens satisfy: 9.2 mm < TTL / Fno < 9.6 mm.

[0017] It is further preferred that the effective focal length f of the optical lens and a focal length f1 of the first lens satisfy: -2.7 < f1 / f < -2; a radius of curvature R1 of the object side of the first lens, a radius of curvature R2 of the image side of the first lens and the focal length f1 of the first lens satisfy: -0.9 < f1 / (R1+R2) < -0.5.

[0018] It is further preferred that a focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -12 < f2 / f < -5.

[0019] It is further preferred that a focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.7 < f3 / f < 2; a radius of curvature R5 of the object side of the third lens and a radius of curvature R6 of the image side of the third lens satisfy: 0.2 < (R5+R6) / (R5-R6) < 0.45.

[0020] It is further preferred that a focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2 < f4 / f < 2.3; a radius of curvature R7 of the object side of the fourth lens and a radius of curvature R8 of the image side of the fourth lens satisfy: 0.05 < (R7+R8) / (R7-R8) < 0.35.

[0021] It is further preferred that a focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.5 < f5 / f < -1.1.

[0022] It is further preferred that a focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 2.2 < f6 / f < 3; a radius of curvature R11 of the object side of the sixth lens and a radius of curvature R12 of the image side of the sixth lens satisfy: -1.7 < (R11+R12) / (R11-R12) < -1.1.

[0023] Compared with the prior art, the optical lens provided by the application adopts six lenses with specific optical powers, and through specific surface shape matching and reasonable optical power distribution, the imaging quality of the optical lens is improved, the aberration is reduced, and the imaging quality of the optical lens is improved, so that the lens has one or more advantages of super wide angle, large aperture, large image surface, miniaturization, high imaging quality and the like. BRIEF DESCRIPTION OF DRAWINGS

[0024] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0025] Figure 1 FIG. 1 is a structural schematic diagram of an optical lens in Embodiment 1 of the present application.

[0026] Figure 2 FIG. 2 is a field curvature curve diagram of the optical lens in Embodiment 1 of the present application.

[0027] Figure 3 FIG. 3 is a distortion curve diagram of the optical lens in Embodiment 1 of the present application.

[0028] Figure 4 FIG. 4 is a longitudinal chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present application.

[0029] Figure 5 FIG. 5 is a transverse chromatic aberration curve diagram of the optical lens in Embodiment 1 of the present application.

[0030] Figure 6 FIG. 6 is a structural schematic diagram of an optical lens in Embodiment 2 of the present application.

[0031] Figure 7 FIG. 7 is a field curvature curve diagram of the optical lens in Embodiment 2 of the present application.

[0032] Figure 8 FIG. 8 is a distortion curve diagram of the optical lens in Embodiment 2 of the present application.

[0033] Figure 9 FIG. 9 is a longitudinal chromatic aberration curve diagram of the optical lens in Embodiment 2 of the present application.

[0034] Figure 10 FIG. 10 is a transverse chromatic aberration curve diagram of the optical lens in Embodiment 2 of the present application.

[0035] Figure 11 FIG. 11 is a structural schematic diagram of an optical lens in Embodiment 3 of the present application.

[0036] Figure 12 FIG. 12 is a field curvature curve diagram of the optical lens in Embodiment 3 of the present application.

[0037] Figure 13 FIG. 13 is a distortion curve diagram of the optical lens in Embodiment 3 of the present application.

[0038] Figure 14 A longitudinal chromatic aberration curve of the optical lens in Embodiment 3 of the present application.

[0039] Figure 15 A transverse chromatic aberration curve of the optical lens in Embodiment 3 of the present application.

[0040] Figure 16 A structure diagram of the optical lens in Embodiment 4 of the present application.

[0041] Figure 17 A field curvature curve of the optical lens in Embodiment 4 of the present application.

[0042] Figure 18 A distortion curve of the optical lens in Embodiment 4 of the present application.

[0043] Figure 19 A longitudinal chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0044] Figure 20 A transverse chromatic aberration curve of the optical lens in Embodiment 4 of the present application.

[0045] The following detailed description will further describe the present application with reference to the above-mentioned drawings. DETAILED DESCRIPTION

[0046] For a better understanding of the present application, various aspects of the present application will be described in more detail below with reference to the accompanying drawings. It is to be noted that these detailed descriptions are only descriptions of embodiments of the present application and are not intended in any way to limit the scope of the present application. Throughout the specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0047] It is to be noted that, in the present specification, the expressions first, second, third and the like are used only to distinguish one feature from another feature, and do not indicate any limitation on the features. Thus, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0048] In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shape of the spherical surface or the aspherical surface shown in the drawings is shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The drawings are merely examples and are not drawn to scale.

[0049] In the present disclosure, the paraxial region refers to a region near the optical axis. If a lens surface is convex and the position of the convex surface is not specified, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the position of the concave surface is not specified, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface of the lens, and the surface of each lens closest to the image plane is referred to as the image side surface of the lens.

[0050] It should also be understood that the use of the terms "including", "including", "having", "containing", and / or "containing", when used in this specification, means that the presence of the stated features, elements and / or components, but does not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of" appear after a list of listed features, they modify the entire list of features, not individual elements of the list. In addition, when describing embodiments of the present application, "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0051] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0052] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0053] The optical lens provided by the embodiments of the present application is composed of six lenses, which are sequentially arranged along the optical axis from the object side to the image plane as the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens.

[0054] In some embodiments, the first lens can have a negative focal power, the object side surface of which is convex, and the image side surface of which is concave. The second lens can have a negative focal power, the object side surface of which is concave, and the image side surface of which is convex. The third lens can have a positive focal power, the object side surface of which is convex, and the image side surface of which is convex. The fourth lens can have a positive focal power, the object side surface of which is convex, and the image side surface of which is convex. The fifth lens can have a negative focal power, the object side surface of which is concave, and the image side surface of which is concave. The sixth lens can have a positive focal power, the object side surface of which is convex, and the image side surface of which is concave.

[0055] In some embodiments, the optical lens can further comprise a diaphragm, which can be located between the second lens and the third lens. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. It can be understood that the diaphragm is used to limit the amount of light to change the brightness of the imaging. When the diaphragm is located between the second lens and the third lens, the correction of the diaphragm aberration is facilitated.

[0056] In some embodiments, the optical lens can further comprise a filter and a protective glass, which can be sequentially arranged along the optical axis between the sixth lens and the imaging surface. The filter is used to filter out interference light to prevent the interference light from reaching the imaging surface of the optical lens and affecting normal imaging. The protective glass plays a role in protecting the optical lens to prevent the photosensitive chip from being damaged and affecting the imaging effect of the lens.

[0057] In some embodiments, the combined focal length f12 of the first lens and the second lens and the effective focal length f of the optical lens satisfy: -2.3 < f12 / f < -1.4. Satisfying the above condition, the front lens group composed of the first lens and the second lens provides negative optical power for the optical lens, which is beneficial to the large-angle light beam to pass through and enter the diaphragm of the optical lens, so as to realize that the optical lens satisfies the large wide angle, while improving the image surface brightness of the large-angle field of view of the optical lens, and improving the imaging quality of the optical lens.

[0058] In some embodiments, the combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens and the effective focal length f of the optical lens satisfy: 1.3 < f3456 / f < 1.6. Satisfying the above condition, the rear lens group composed of the third lens, the fourth lens, the fifth lens and the sixth lens provides positive optical power for the optical lens, which is beneficial to correct the chromatic aberration and field curvature of the optical lens, and slow down the light deflection angle, reduce the sensitivity, reduce the difficulty of lens forming, and can realize the balance of the overall spherical aberration, and obtain good imaging quality of the on-axis field of view.

[0059] In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the effective focal length f of the optical lens satisfy: 2 < IH / f < 2.2. Satisfying the above condition, the ratio of the effective focal length and the image height of the optical lens is controlled. Shortening the effective focal length can expand the field angle, so that the optical lens can shoot a wider object space, can increase the width of the light beam entering the optical lens, so that the brightness of the optical lens at the image surface is improved to avoid dark corners; At the same time, the optical lens has the characteristics of large image surface, which matches the chip with large image surface to improve the resolution, and ensures the imaging quality of the optical lens.

[0060] In some embodiments, the optical total length TTL of the optical lens and the aperture value Fno of the optical lens satisfy: 9.2mm < TTL / Fno < 9.6mm. By satisfying the above condition, the relationship between the total length and the aperture value of the optical lens is controlled, so that the optical lens can meet the design requirements of large aperture and miniaturization, and sufficient light quantity can be obtained in a dim environment, so that high-quality and high-definition shooting needs can be met.

[0061] In some embodiments, the effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 < f1 / f < -2. Satisfying the above condition formula makes the first lens have a negative refractive power, which can have a diverging effect on the light passing through it, expand the field of view angle of the optical lens, and simplify the balance of aberration correction and imaging quality of the whole optical lens.

[0062] In some embodiments, the object side surface radius of curvature R1 of the first lens, the image side surface radius of curvature R2 of the first lens, and the focal length f1 of the first lens satisfy: -0.9 < f1 / (R1+R2) < -0.5. Satisfying the above condition formula can constrain the surface shape of the object side and the image side of the first lens, which is conducive to reducing the bending degree of the light at the image side of the first lens, reducing the astigmatism of the optical lens, balancing the astigmatism problem brought by the large field of view angle of the optical lens, so that the optical lens has a large field of view while the astigmatism is not too large, and the optical lens has excellent imaging quality.

[0063] In some embodiments, the focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -12 < f2 / f < -5. Satisfying the above condition formula sets the second lens to have a negative refractive power, which can further control the incident angle of the light, expand the field of view angle of the optical lens, increase the back focal length of the optical lens, avoid interference between the lens and the photosensitive chip, and facilitate aberration correction, thereby further improving the imaging quality of the optical lens.

[0064] In some embodiments, the focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.7 < f3 / f < 2. Satisfying the above condition formula makes the third lens have a converging effect on the light, which is matched with the negative refractive power of the first lens and the second lens, can further converge the light passing through the second lens, and reduce the height of the peripheral light, which is conducive to reducing the aperture of the rear-end lens and balancing the aberration and improving the resolution.

[0065] In some embodiments, the object side surface radius of curvature R5 of the third lens and the image side surface radius of curvature R6 of the third lens satisfy: 0.2 < (R5+R6) / (R5-R6) < 0.45. Satisfying the above condition formula designs the third lens as a double-convex surface, which can reasonably increase the incident angle to meet the image height requirement of the optical lens, reduce the sensitivity of the optical lens, and improve the assembly stability.

[0066] In some embodiments, the focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2 < f4 / f < 2.3. By satisfying the above condition, the light rays from the first three lenses can be further converged by setting the fourth lens with a large positive focal power, and the aberration problems caused by the first three lenses can be corrected, and the aberration of the edge field of view can be effectively improved, and the overall imaging quality of the optical lens is improved.

[0067] In some embodiments, the radius of curvature R7 of the object side surface of the fourth lens and the radius of curvature R8 of the image side surface of the fourth lens satisfy: 0.05 < (R7+R8) / (R7-R8) < 0.35. By satisfying the above condition, the fourth lens is designed as a double convex surface, which is convenient for converging light rays from the third lens, reduces the aberration caused by the front lens group, and makes the fourth lens structure compact and improves the assembly stability.

[0068] In some embodiments, the focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy: -1.5 < f5 / f < -1.1. By satisfying the above condition, the fifth lens is set to have a negative focal power, which makes the large field of view light rays slowly rise, changes the parallel light trend of the light beam to a divergent trend, which is beneficial to control the back focus of the lens and is beneficial to realize a large target surface.

[0069] In some embodiments, the focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 2.2 < f6 / f < 3. By satisfying the above condition, the sixth lens is limited to have a positive focal power, which is beneficial to light convergence, so as to effectively correct chromatic aberration. At the same time, as the last lens, the sixth lens can correct the aberration caused by the eccentricity of each lens on the object side, that is, the eccentricity sensitivity of the optical lens can be reduced, the astigmatism caused by the eccentricity of each lens on the object side can be suppressed, so as to correct the aberration of the optical lens and improve the imaging resolution.

[0070] In some embodiments, the radius of curvature R11 of the object side surface of the sixth lens and the radius of curvature R12 of the image side surface of the sixth lens satisfy: -1.7 < (R11+R12) / (R11-R12) < -1.1. By satisfying the above condition, the surface type of the image side surface of the seventh lens is controlled, which effectively corrects the spherical aberration of the optical lens and reduces the influence of astigmatism on the imaging of the optical lens. In addition, the trend of the light rays can be adjusted, so that the optical lens has a large field of view angle and is super-thin.

[0071] In some embodiments, the focal length f2 of the second lens and the central thickness CT2 of the second lens satisfy: -9.7 < f2 / CT2 < -5.9. Satisfying the above condition formula, the effective focal length and the thickness of the second lens can be reasonably configured, so that the light entering the optical lens is more gentle, the sensitivity of the optical lens is reduced, the aberration generated by the optical lens is corrected, and then the imaging quality of the optical lens is improved.

[0072] In some embodiments, the half light entrance radius CSD11 of the object side surface of the first lens and the distance CT12 of the first lens and the second lens on the optical axis satisfy: 1.5 < CSD11 / CT12 < 1.7. Satisfying the above condition formula, by controlling the half light entrance radius of the object side surface of the first lens and reducing the air gap between the first lens and the second lens, the total length of the optical lens is reduced, the arrangement of the optical lens is more compact, and the risk of ghost image generation is reduced. Furthermore, it is also beneficial to reduce the difficulty of the optical lens structure arrangement and improve the assembly yield of the optical lens.

[0073] In some embodiments, the half light entrance radius sag11 of the object side surface of the first lens and the central thickness CT1 of the first lens satisfy: 1 < SAG11 / CT1 < 1.5. Satisfying the above condition formula, controlling the ratio of the sag of the object side surface of the first lens and the central thickness of the first lens on the optical axis can make the surface type of the object side surface deviate from the curvature. At the same time, the larger sag is beneficial to the first lens to collect large field of view light, realize high angular resolution in the center of the optical lens, and then improve the imaging quality in the central region.

[0074] In some embodiments, the half light entrance radius CSD11 of the object side surface of the first lens and the half light entrance radius CSD61 of the object side surface of the sixth lens satisfy: 1.5 < CSD11 / CSD61 < 1.8. Satisfying the above condition formula, by controlling the ratio of the half light entrance radius of the object side end of the first lens and the half light entrance radius of the object side end of the sixth lens, the optical lens has a smaller aperture size, which is convenient for being mounted on a vehicle-mounted device. At the same time, it ensures that the optical lens can collect large-angle light and realize large field of view angle imaging of the optical lens, increases the imaging area of the optical lens, and improves the imaging quality.

[0075] In some embodiments, the half light entrance radius CSD51 of the object side surface of the fifth lens and the half light entrance radius sag51 of the object side surface of the fifth lens satisfy: -4.6 < CSD51 / SAG51 < -3.8. Satisfying the above condition formula, by adjusting the edge region surface type of the object side surface of the fifth lens, the ghost reflection energy can be reduced and the field curvature can be optimized, and the imaging quality of the optical lens is improved.

[0076] In some embodiments, the optical lens satisfies the condition formula: 2.8mm < f < 3mm; 115° < FOV < 120°; 1.4mm < EPD < 1.5mm; 18mm < TTL < 20mm; 2 ≤ Fno ≤ 2.04; 5.9mm < IH < 6.1mm; wherein f represents an effective focal length of the optical lens, FOV represents a maximum field of view angle of the optical lens, EPD represents an entrance pupil diameter of the optical lens, TTL represents an optical total length of the optical lens, Fno represents an aperture value of the optical lens, and IH represents a real image height corresponding to the maximum field of view angle of the optical lens. The optical lens satisfies the above condition formula, and has at least one or more advantages of a short focal length, a super-large field of view angle, a large entrance pupil diameter, a short total length, a large aperture, a large image surface, low distortion, and low sensitivity.

[0077] In some embodiments, the lens material in the optical lens provided by the present application can be glass or plastic. When the lens material is plastic, the production cost can be effectively reduced. When the lens material is glass, the geometric chromatic aberration of the optical system can be effectively corrected by the low dispersion characteristic of the glass itself. The first lens and the third lens in the optical lens provided by the present application are glass lenses, and the second lens, the fourth lens, the fifth lens, and the sixth lens are plastic lenses. The optical lens of the present application adopts a glass-plastic hybrid structure to improve the thermal stability.

[0078] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens can adopt a spherical lens or an aspherical lens. Compared with a spherical structure, an aspherical structure can effectively reduce the aberration of the optical system, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization. More specifically, the first lens and the third lens of the present application adopt a spherical lens, and the second lens, the fourth lens, the fifth lens, and the sixth lens all adopt an aspherical lens, which can effectively reduce the aberration of the optical lens, thereby reducing the number of lenses and the size of the lenses, and better achieving lens miniaturization.

[0079] In various embodiments of the present application, when the lens adopts an aspherical lens, each aspherical surface shape of the optical lens satisfies the following equation:

[0080] ;

[0081] wherein z is the distance of the curved surface from the vertex of the curved surface in the direction of the optical axis, h is the distance from the optical axis to the curved surface, c is the curvature of the vertex of the curved surface, K is the quadratic surface coefficient, and B, C, D, E, F, and G are the fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, and fourteenth-order surface coefficients, respectively.

[0082] The application will be further described in the following embodiments. In each embodiment, the thickness, radius of curvature, material selection of each lens in the optical lens are different, and the specific differences can be referred to the parameter table of each embodiment. The following embodiments are only the preferred embodiments of the application, but the embodiments of the application are not limited to the following embodiments only, any changes, substitutions, combinations or simplifications made without departing from the innovative points of the application should be regarded as equivalent replacement, and are included in the protection scope of the application.

[0083] Embodiment 1

[0084] Please refer to Figure 1 , which is a structural schematic diagram of the optical lens 100 provided in the embodiment 1 of the application, which includes, along the optical axis from the object side to the imaging surface, a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a filter G1 and a protective glass G2.

[0085] The first lens L1 has negative optical power, the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface.

[0086] The second lens L2 has negative optical power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface.

[0087] The third lens L3 has positive optical power, the object side surface S5 is a convex surface, and the image side surface S6 is a convex surface.

[0088] The fourth lens L4 has positive optical power, the object side surface S7 is a convex surface, and the image side surface S8 is a convex surface.

[0089] The fifth lens L5 has negative optical power, the object side surface S9 is a concave surface, and the image side surface S10 is a concave surface.

[0090] The sixth lens L6 has positive optical power, the object side surface S11 is a convex surface, and the image side surface S12 is a concave surface.

[0091] The object side surface S13 and the image side surface S14 of the filter G1 are both flat surfaces.

[0092] The object side surface S15 and the image side surface S16 of the protective glass G2 are both flat surfaces.

[0093] The imaging surface S17 is a flat surface.

[0094] The first lens L1 and the third lens L3 are glass spherical lenses, and the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are plastic aspherical lenses.

[0095] The related parameters of each lens in the optical lens 100 in the embodiment 1 are shown in Table 1-1.

[0096] Table 1-1

[0097]

[0098] The surface parameters of the aspherical lens of the optical lens 100 in Embodiment 1 are shown in Table 1-2.

[0099] Table 1-2

[0100]

[0101] Figure 2 A field curvature curve of the optical lens 100 in the embodiment is shown, which represents the bending degree of the light rays on the meridional image surface and the sagittal image surface, the horizontal axis represents the offset (unit: mm), and the vertical axis represents the field of view angle (unit: °). As can be seen from the figure, the field curvature of the meridional image surface and the sagittal image surface is controlled within ±0.05 mm, which shows that the optical lens 100 can better correct the field curvature.

[0102] Figure 3 A distortion curve of the optical lens 100 in the embodiment is shown, which represents the distortion of different field angles on the imaging surface, the horizontal axis represents the distortion value (unit: %), and the vertical axis represents the field of view angle (unit: °). As can be seen from the figure, the distortion value is controlled within -40%~0, which shows that the optical lens 100 can better correct the distortion.

[0103] Figure 4 A longitudinal chromatic aberration curve of the optical lens 100 in the embodiment is shown, which represents the chromatic aberration of each wavelength on the optical axis at the imaging surface, the horizontal axis represents the longitudinal chromatic aberration value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from the figure, the offset of the longitudinal chromatic aberration is controlled within -0.02 mm~0.01 mm, which shows that the optical lens 100 can better correct the longitudinal chromatic aberration.

[0104] Figure 5 A transverse chromatic aberration curve of the optical lens 100 in the embodiment is shown, which represents the chromatic aberration of each wavelength relative to the central wavelength (0.94 μm) at different image heights on the imaging surface, the horizontal axis represents the transverse chromatic aberration value of each wavelength relative to the central wavelength (unit: μm), and the vertical axis represents the normalized field of view angle. As can be seen from the figure, the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ±1.5 μm, which shows that the optical lens 100 can better correct the chromatic aberration.

[0105] Embodiment 2

[0106] Please refer to Figure 6 , which is a structural schematic diagram of the optical lens 200 provided in Embodiment 2 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0107] The related parameters of each lens in the optical lens 200 in Embodiment 2 are shown in Table 2-1.

[0108] Table 2-1

[0109]

[0110] The surface type parameters of the aspherical lenses of the optical lens 200 in Embodiment 2 are shown in Table 2-2.

[0111] Table 2-2

[0112]

[0113] In this embodiment, the field curvature curve, the distortion curve, the longitudinal chromatic aberration curve and the transverse chromatic aberration curve of the optical lens 200 are shown in Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 respectively.

[0114] As can be seen from Figure 7 , the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.1mm~0.05mm, which shows that the optical lens 200 can correct the field curvature well.

[0115] As can be seen from Figure 8 , the distortion value is controlled within-40%~0, which shows that the optical lens 200 can correct the distortion well.

[0116] As can be seen from Figure 9 , the offset of the longitudinal chromatic aberration is controlled within-0.04mm~0.03mm, which shows that the optical lens 200 can correct the longitudinal chromatic aberration well.

[0117] As can be seen from Figure 10 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within±1μm, which shows that the optical lens 200 can correct the chromatic aberration well.

[0118] Embodiment 3

[0119] Please refer to Figure 11 , which is a structural schematic diagram of the optical lens 300 provided in Embodiment 3 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0120] The related parameters of each lens in the optical lens 300 in Embodiment 3 are shown in Table 3-1.

[0121] Table 3-1

[0122]

[0123] The surface profile parameters of the aspherical lens of the optical lens 300 in Embodiment 3 are shown in Table 3-2.

[0124] Table 3-2

[0125]

[0126] In the present embodiment, the field curvature curve, the distortion curve, the longitudinal chromatic aberration curve and the transverse chromatic aberration curve of the optical lens 300 are shown in Figure 12 、 Figure 13 、 Figure 14 、 Figure 15 respectively.

[0127] As can be seen from Figure 12 , the field curvature of the meridional image surface and the sagittal image surface is controlled within-0.05mm~0.1mm, which indicates that the optical lens 300 can better correct the field curvature.

[0128] As can be seen from Figure 13 , the distortion value is controlled within-40%~0, which indicates that the optical lens 300 can better correct the distortion.

[0129] As can be seen from Figure 14 , the offset of the longitudinal chromatic aberration is controlled within-0.02mm~0.01mm, which indicates that the optical lens 300 can better correct the longitudinal chromatic aberration.

[0130] As can be seen from Figure 15 , the transverse chromatic aberration of the longest wavelength and the shortest wavelength is controlled within±1.5μm, which indicates that the optical lens 300 can better correct the chromatic aberration.

[0131] Embodiment 4

[0132] Please refer to Figure 16 , which is a structural schematic diagram of the optical lens 400 provided in Embodiment 4 of the present application. Compared with Embodiment 1, the main difference is that the optical parameters such as the radius of curvature of each lens surface and the lens thickness are different.

[0133] The related parameters of each lens in the optical lens 400 in Embodiment 4 are shown in Table 4-1.

[0134] Table 4-1

[0135]

[0136] The surface profile parameters of the aspherical lens of the optical lens 400 in Embodiment 4 are shown in Table 4-2.

[0137] Table 4-2

[0138]

[0139] In this embodiment, the field curvature curve, distortion curve, longitudinal chromatic aberration curve, and transverse chromatic aberration curve of the optical lens 400 are respectively as follows: Figure 17 , Figure 18 , Figure 19 , Figure 20 As shown.

[0140] from Figure 17 As can be seen, the field curvature of the meridional and sagittal image planes is controlled within ±0.05mm, indicating that the optical lens 400 can correct the field curvature well.

[0141] from Figure 18 As can be seen, the distortion value is controlled within -40% to 0, indicating that the optical lens 400 can correct distortion well.

[0142] from Figure 19 As can be seen, the offset of the longitudinal chromatic difference is controlled within -0.05mm to 0.01mm, indicating that the optical lens 400 can correct the longitudinal chromatic difference well.

[0143] from Figure 20 As can be seen, the transverse chromatic aberration of the longest and shortest wavelengths is controlled within ±1μm, indicating that the optical lens 400 can correct chromatic aberration well.

[0144] Please refer to Table 5 for the optical characteristics corresponding to each of the above embodiments, including the effective focal length f, total optical length TTL, aperture value Fno, true image height IH corresponding to the maximum field of view, principal ray incident angle CRA at the maximum image height, maximum field of view FOV, and the values ​​corresponding to each conditional expression in each embodiment.

[0145] Table 5

[0146]

[0147] In summary, the optical lens provided by the present invention employs six lenses with specific optical power. Through specific surface shape matching and reasonable optical power distribution, it can improve the imaging quality of the optical lens, reduce aberrations, and enhance the imaging quality of the optical lens, giving the lens one or more advantages such as ultra-wide angle, large aperture, large image plane, miniaturization, and high imaging quality.

[0148] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like 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 application. In the present 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 can be combined in any one or more embodiments or examples in a suitable manner.

[0149] The above-described embodiments only express several implementation manners of the present application, which are described in a more specific and detailed manner, but cannot be understood as a limitation on the patent scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which are all within the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. An optical lens, comprising six lenses, characterized in that, Along the optical axis from the object side to the imaging plane, the following are included in sequence: The first lens with negative optical power has a convex object side and a concave image side. A second lens with negative optical power has a concave object side and a convex image side. A third lens with positive optical power has a convex object-side surface and a convex image-side surface. The fourth lens with positive optical power has a convex object-side surface and a convex image-side surface. The fifth lens with negative optical power has a concave object side and a concave image side. The sixth lens with positive optical power has a convex object-side surface and a concave image-side surface. Wherein, the true image height IH corresponding to the maximum field of view of the optical lens and the effective focal length f of the optical lens satisfy: 2 < IH / f < 2.2; The combined focal length f12 of the first lens and the second lens satisfies the following condition with respect to the effective focal length f of the optical lens: -2.3 < f12 / f < -1.4; The combined focal length f3456 of the third lens, the fourth lens, the fifth lens and the sixth lens satisfies the following condition with respect to the effective focal length f of the optical lens: 1.3 < f3456 / f < 1.

6.

2. The optical lens according to claim 1, characterized in that, The half-aperture height SAG11 of the object side of the first lens and the center thickness CT1 of the first lens satisfy the following condition: 1 < SAG11 / CT1 < 1.

5.

3. The optical lens according to claim 1, characterized in that, The half-aperture CSD11 of the object-side surface of the first lens and the half-aperture CSD61 of the object-side surface of the sixth lens satisfy the following: 1.5 < CSD11 / CSD61 < 1.

8.

4. The optical lens according to claim 1, characterized in that, The total optical length TTL of the optical lens and the aperture value Fno of the optical lens satisfy the following condition: 9.2mm < TTL / Fno < 9.6mm.

5. The optical lens according to claim 1, characterized in that, The effective focal length f of the optical lens and the focal length f1 of the first lens satisfy: -2.7 < f1 / f < -2; the object side radius of curvature R1 and the image side radius of curvature R2 of the first lens and the focal length f1 of the first lens satisfy: -0.9 < f1 / (R1+R2) < -0.

5.

6. The optical lens according to claim 1, characterized in that, The focal length f2 of the second lens and the effective focal length f of the optical lens satisfy: -12 < f2 / f < -5.

7. The optical lens according to claim 1, characterized in that, The focal length f3 of the third lens and the effective focal length f of the optical lens satisfy: 1.7 < f3 / f < 2; the object side curvature radius R5 of the third lens and the image side curvature radius R6 of the third lens satisfy: 0.2 < (R5 + R6) / (R5 - R6) < 0.

45.

8. The optical lens according to claim 1, characterized in that, The focal length f4 of the fourth lens and the effective focal length f of the optical lens satisfy: 2 < f4 / f < 2.3; the object side curvature radius R7 of the fourth lens and the image side curvature radius R8 of the fourth lens satisfy: 0.05 < (R7 + R8) / (R7 - R8) < 0.

35.

9. The optical lens according to claim 1, characterized in that, The focal length f5 of the fifth lens and the effective focal length f of the optical lens satisfy the condition: -1.5 < f5 / f < -1.

1.

10. The optical lens according to claim 1, characterized in that, The focal length f6 of the sixth lens and the effective focal length f of the optical lens satisfy: 2.2 < f6 / f < 3; the object side radius of curvature R11 of the sixth lens and the image side radius of curvature R12 of the sixth lens satisfy: -1.7 < (R11 + R12) / (R11 - R12) < -1.1.

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