Optical lens

Abstract

The invention provides an optical lens which comprises a front lens group, a rear lens group and an aperture. The front lens group comprises a plurality of front lens pieces which are sequentially arranged from the object side to the image side, and a second lens and a third lens in the plurality of front lens pieces are non-rotational symmetric lenses. The rear lens group comprises at least one rear lens piece, and the at least one rear lens piece is a glued lens. The aperture is located between the front lens group and the rear lens group. The half field angles of the optical lens in the horizontal direction and the vertical direction are both larger than 90 degrees, and the following relational expression is met: EFLX / EFLY is larger than 1.1; eFLY / F2Y-EFLX / F2X is less than-5%; and EFLY / F3Y-EFLX / F3X > 5%. Therefore, the optical lens provided by the invention can improve the pixel utilization rate.

Description

Technical Field

[0001] This application relates to an optical lens, and particularly to an optical lens that uses a non-rotationally symmetric lens to improve pixel utilization rate. Background Art

[0002] Press, wide-angle lenses have a short focal length (less than 35 mm), so the shooting range can be very wide. Also, because the range is very large, they can be used to magnify a narrow space and present a distorted view. The ultra-wide angle, also known as the fish-eye lens, is characterized by being able to capture a wider range than the wide-angle lens.

[0003] However, existing fish-eye lenses use circular lenses. Therefore, the image circle presented is circular, and the pixel utilization rate cannot be fully utilized.

[0004] Therefore, how to overcome the above-mentioned defects through the improvement of structural design has become one of the important issues to be solved in this field. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide an optical lens in view of the deficiencies of the prior art.

[0006] To solve the above technical problem, one of the technical solutions adopted by this application is to provide an optical lens, including a front lens group, a rear lens group, and an aperture. The front lens group includes a plurality of front lens elements arranged in sequence from the object side to the image side. The second lens and the third lens among the plurality of front lens elements are non-rotationally symmetric lenses. The rear lens group includes at least one rear lens element, and at least one of the rear lens elements is a cemented lens. The aperture is located between the front lens group and the rear lens group. Among them, the half field of view angle of the optical lens in the horizontal direction and the vertical direction is greater than 90°, and the following relationships are satisfied: EFLX / EFLY > 1.1; EFLY / F2Y - EFLX / F2X < -5%; and EFLY / F3Y - EFLX / F3X > 5%; where EFLX is the effective focal length of the optical lens in the horizontal direction, EFLY is the effective focal length of the optical lens in the vertical direction, F2X is the effective focal length of the second lens in the horizontal direction, F2Y is the effective focal length of the second lens in the vertical direction, F3X is the effective focal length of the third lens in the horizontal direction, and F3Y is the effective focal length of the third lens in the vertical direction.

[0007] In one possible or preferred embodiment, the plurality of front lens elements include a first front lens, a second front lens, a third front lens, a fourth front lens, and a fifth front lens arranged in sequence from the object side to the image side. The second front lens and the third front lens are the non-rotationally symmetric lenses. The third front lens has a convex surface facing the object side, and the fourth front lens has a convex surface facing the image side.

[0008] In one possible or preferred embodiment, the first front lens and the fifth front lens are made of glass.

[0009] In one possible or preferred embodiment, the fourth front lens is an aspherical lens.

[0010] In one possible or preferred embodiment, the rear lens group includes a plurality of rear lens elements. The plurality of rear lens elements include a first rear lens and a second rear lens arranged in sequence from the object side to the image side. The first rear lens is the cemented lens.

[0011] In one possible or preferred embodiment, the first rear lens includes a front lens, an intermediate lens, and a rear lens. The front lens is connected to one side of the intermediate lens, and the rear lens is connected to the other side of the intermediate lens.

[0012] In one possible or preferred embodiment, the second rear lens is an aspherical lens.

[0013] In one possible or preferred embodiment, the optical lens satisfies the following relationship: H90 / H10 > 1.3; where H90 is the imaging width at a horizontal half-angle of 80° to 90°, and H10 is the imaging width at a horizontal half-angle of 0° to 10°.

[0014] In one possible or preferred embodiment, the optical lens satisfies the following relationship: V90 / V10 > 1.05; where V90 is the imaging width at a vertical half-angle of 80° to 90°, and V10 is the imaging width at a vertical half-angle of 0° to 10°.

[0015] In one possible or preferred embodiment, each of the non-rotationally symmetric lenses satisfies the following relationship:

[0016]

[0017] where c is the vertex curvature, K is the conic constant, and cj is the coefficient.

[0018] One of the beneficial effects of the present application is that the optical lens provided by the present application can improve the pixel utilization rate through the technical solution of "the front lens group includes a plurality of front lens elements arranged in sequence from the object side to the image side, and the second lens and the third lens among the plurality of front lens elements are non-rotationally symmetric lenses. The rear lens group includes at least one rear lens element, and at least one of the rear lens elements is a cemented lens. The aperture is located between the front lens group and the rear lens group. Wherein, the half field of view angle of the optical lens in the horizontal direction and the vertical direction is greater than 90°, and the following relational expressions are satisfied: EFLX / EFLY>1.1; EFLY / F2Y - EFLX / F2X<-5%; EFLY / F3Y - EFLX / F3X>5%; where, EFLX is the effective focal length of the optical lens in the horizontal direction, EFLY is the effective focal length of the optical lens in the vertical direction, F2X is the effective focal length of the second lens in the horizontal direction, F2Y is the effective focal length of the second lens in the vertical direction, F3X is the effective focal length of the third lens in the horizontal direction, and F3Y is the effective focal length of the third lens in the vertical direction".

[0019] To further understand the features and technical content of the present application, please refer to the following detailed description and drawings of the present application. However, the provided drawings are only for reference and illustration, and are not used to limit the present application.

[0020] The other effects and detailed content of the embodiments of the present application are described below in conjunction with the drawings. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 Schematic diagram of the structural configuration of one perspective of the optical lens according to the first embodiment of the present application;

[0023] [[ID=It is 18]] Figure 2 Schematic diagram of the structural configuration of another perspective of the optical lens according to the first embodiment of the present application;

[0024] Figure 3 Longitudinal aberration diagram of the optical lens according to the first embodiment of the present application;

[0025] Figure 4 Astigmatism field curvature diagram and distortion diagram of the optical lens according to the first embodiment of the present application;

[0026] Figure 5 Schematic diagram of the relationship between the field of view angle and the image point of the optical lens of the present application;

[0027] Figure 6 Schematic diagram of the structural configuration of one perspective of the optical lens of the second embodiment of the present application;

[0028] Figure 7 Schematic diagram of the structural configuration of another perspective of the optical lens of the second embodiment of the present application;

[0029] Figure 8 Longitudinal aberration diagram of the optical lens of the second embodiment of the present application;

[0030] Figure 9 Astigmatism field curvature diagram and distortion diagram of the optical lens of the second embodiment of the present application.

[0031] Symbol description

[0032] Z1, Z2: Optical lens; G1: Front lens group;

[0033] L1: First front lens; L2: Second front lens;

[0034] L3: Third front lens; L4: Fourth front lens;

[0035] L5: Fifth front lens; G2: Rear lens group;

[0036] L6: First rear lens; L61: Front lens;

[0037] L62: Intermediate lens; L63: Rear lens;

[0038] L7: Second rear lens; A: Aperture;

[0039] F1: Object side; F2: Image side;

[0040] M: Imaging component;

[0041] P: Optical axis; S10, S11, S20, S21, S30, S31, S40, S41, S50, S51, S60, S61, S62, S63, S70, S71;

[0042] SM: Surface. Detailed implementation manners

[0043] The following are specific embodiments to illustrate the embodiments of the "optical lens" disclosed in the present application. Those skilled in the art can understand the advantages and effects of the present application from the content disclosed in this specification. The present application can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present application. In addition, the drawings of the present application are only simple schematic illustrations and are not drawn according to actual sizes, which is stated in advance. The following embodiments will further detail the related technical content of the present application, but the disclosed content is not used to limit the protection scope of the present application.

[0044] It should be understood that although terms such as "first", "second", "third", etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are mainly used to distinguish one component from another. In addition, the term "or" used herein should, depending on the actual situation, may include any one or a combination of more of the associated listed items.

[0045] First Embodiment

[0046] Please refer to Figure 1 and Figure 2 , which are respectively the schematic structural configuration diagrams of one perspective and another perspective of the optical lens of the first embodiment of the present application. As Figure 1 and Figure 2 shown, the present application provides an optical lens Z1, which can be an imaging lens and can be applicable to fields such as security monitoring, vehicle-mounted or mobile imaging, etc., but the present application is not limited thereto; among them, the optical lens Z1 of the present application can be a fish-eye lens.

[0047] Cooperating with Figure 1 and Figure 2 shown, the optical lens Z1 of the present application can have an optical axis P. The optical lens Z1 can include a front lens group G1, a rear lens group G2, and an aperture A. The front lens group G1, the aperture A, and the rear lens group G2 are arranged in sequence from the object side F1 to the image side F2. The object side F1 can be the side where light enters the optical lens Z1, and the image side F2 can be the side where light exits the optical lens Z1, and the light entering the optical lens Z1 can be transmitted from the object side F1 towards the image side F2 and form an image on the imaging component M (such as a Charge-coupled Device (CCD), but not limited thereto). Among them, Figure 1 represents the schematic cross-sectional view of the optical lens Z1 in the Y-Z direction, and Figure 2It shows a schematic cross-sectional view of the optical lens Z1 in the X-Z direction; further, the X direction is the direction parallel to one side of the imaging component M, the Y direction is the direction parallel to the other side of the imaging component M, the Z direction is the direction parallel to the optical axis P, and the X direction, Y direction, and Z direction are perpendicular to each other. It should be noted that in this embodiment, the imaging component M can be rectangular (such as rectangular or square, but not limited thereto); however, it is not limited thereto; the imaging component M can also be circular. When the imaging component M is circular, the X direction and the Y direction can correspond to two mutually perpendicular diameters of the imaging component M; and, Figure 1 It can also be represented as a plane containing the optical axis and parallel to the Y direction and the Z direction, Figure 2 It can also be represented as a plane containing the optical axis and parallel to the X direction and the Z direction.

[0048] The front lens group G1 can include a plurality of front lens elements, and the plurality of front lens elements can include at least two non-rotationally symmetric lenses. In this embodiment, the plurality of front lens elements can include a first front lens L1, a second front lens L2, a third front lens L3, a fourth front lens L4, and a fifth front lens L5 arranged in sequence from the object side F1 to the image side F2. The second front lens L2 and the third front lens L3 can be non-rotationally symmetric lenses. The second front lens L2 and the third front lens L3 can be XY polynomial free-form surface (XYPolynomial) lenses, or the second front lens L2 can be a cylindrical lens (Cylinder Lens). The fourth front lens can be an aspherical lens. The third front lens L3 can have a convex surface facing the object side F1, and the fourth front lens L4 can have a convex surface facing the image side F2. Among them, the first front lens L1 and the fifth front lens L5 can be made of glass, and the second front lens L2, the third front lens L3, and the fourth front lens L4 can be made of plastic, but not limited thereto.

[0049] Among them, all the free-form surfaces of the second front lens L2 and the third front lens L3 of the present application have shapes that are symmetric with respect to the X-Z plane and the Y-Z plane respectively (as Figure 1 and Figure 2 shown), and the center of the free-form surface can be identified. Therefore, the second front lens L2 and the third front lens L3 of the present application have the advantage that the shape can be easily managed during manufacturing.

[0050] The rear lens group may include at least one rear lens element G2, and at least one rear lens element may be a cemented lens. In this embodiment, the rear lens group G2 may include a plurality of rear lens elements, and the plurality of rear lens elements may include a first rear lens L6 and a second rear lens L7 arranged in sequence from an object side to an image side. The first rear lens L6 may be a triple cemented lens, that is, the first rear lens L6 may include a front lens L61, an intermediate lens L62, and a rear lens L63. The front lens L61 is connected to one side of the intermediate lens L62, and the rear lens L63 is connected to the other side of the intermediate lens L62. The second rear lens L7 may be an aspherical lens. Among them, the first rear lens L6 and the second rear lens L7 may be made of plastic, but not limited thereto. In actual implementation of the present application, at least one of the first rear lens L6 and the second rear lens L7 may also be made of glass.

[0051] Furthermore, in this embodiment, the total number of lens elements of the optical lens Z1 may be between six and eight, which has the best and preferred cost-effectiveness, and preferably may be seven, but not limited thereto. The number of free-form surface lenses of the optical lens Z1 of the present application may be two, the number of aspherical lenses may be two, and the number of cemented lenses may be one, but not limited thereto. Moreover, the optical lens Z1 of the present application has at least three or more lens components that are rotationally symmetric with respect to the optical axis P. By reducing the number of free-form surface lenses, the performance bias caused by the direction can be reduced.

[0052] Therefore, in this embodiment, the optical lens Z1 may be a fish-eye lens with a semi-field angle of more than 80°, and thus can cover a wide field of view. Compared with the existing fish-eye lenses, the optical lens Z1 of the present application can perform imaging near the diagonal of the imaging component M by providing non-rotationally symmetric lenses (i.e., free-form surface lenses).

[0053] Furthermore, the semi-field angles of the optical lens Z1 of the present application in the horizontal direction and the vertical direction are both greater than 90°, so it can cover a wide field of view, and the optical lens Z1 of the present application satisfies the following relationship:

[0054] EFLX / EFLY>1.1 (1);

[0055] EFLY / F2Y-EFLX / F2X<-5% (2);

[0056] EFLY / F3Y-EFLX / F3X>5% (3).

[0057] Among them, in the above relationships (1), (2), and (3), EFLX can be the effective focal length in the horizontal direction of the lens, EFLY can be the effective focal length in the vertical direction of the lens, F2X can be the effective focal length in the horizontal direction of the second lens (i.e., the second front lens L2) of the front lens group, F2Y can be the effective focal length in the vertical direction of the second lens of the front lens group, F3X can be the effective focal length in the horizontal direction of the third lens (i.e., the third front lens L3) of the front lens group, and F3Y can be the effective focal length in the vertical direction of the third lens of the front lens group. Further, in this embodiment, the parameters of the optical lens Z1 are preferably as shown in Table 1 below, but not limited thereto. Therefore, the value obtained by the optical lens Z1 of the present application according to relationship (1) is 1.13, the value obtained according to relationship (2) is -8.1%, and the value obtained according to relationship (3) is 9.2%.

[0058] Table 1

[0059]

[0060] Furthermore, the optical lens Z1 of the present application can also satisfy the following relationship:

[0061] H90 / H10 > 1.3 (4).

[0062] Among them, in the above relationship (4), H90 can be the imaging width at a horizontal half-angle of 80° to 90°, and H10 can be the imaging width at a horizontal half-angle of 0° to 10°.

[0063] Also, the optical lens Z1 of the present application can also satisfy the following relationship:

[0064] V90 / V10 > 1.05 (5).

[0065] Among them, in the above relationship (5), V90 can be the imaging width at a vertical half-angle of 80° to 90°, and V10 can be the imaging width at a vertical half-angle of 0° to 10°.

[0066] According to the above content, the actual design of the surfaces of the lenses of the optical lens Z1 of the present application can be seen in Table 2 below.

[0067] Table 2

[0068]

[0069]

[0070] Please refer back to Figure 1 、 Figure 2and Table 2. In this embodiment, the first front lens L1 of the optical lens Z1 has surfaces S10 and S11 in sequence from the object side F1 to the image side F2, and the third front lens L3 has surfaces S30 and S31 in sequence from the object side F1 to the image side F2, and the surfaces S30 and S31 are free-form surfaces of XY polynomials. By analogy, the surfaces corresponding to each component will not be repeated here.

[0071] It should be noted that the intervals in Table 2 are the distances between the next surfaces of the surfaces from the object side F1 to the image side F2. That is to say, the thickness of the first front lens L1 is 0.6 mm, the thickness of the second front lens L2 is 0.55 mm, and the distance between the adjacent surfaces of the first front lens L1 and the second front lens L2 is 7.32 mm. By analogy, it will not be repeated here.

[0072] Moreover, the radius of curvature in Table 2 is the radius of curvature of the surface, and its positive and negative values represent the bending directions. For example, the radius of curvature of the surface S10 of the first front lens L1 is positive, and the radius of curvature of the surface S11 of the first front lens L1 is positive; therefore, the first front lens L1 is a convex-concave lens. Another example is that the radius of curvature of the surface S70 of the second rear lens L7 is positive, while the radius of curvature of the surface S71 is negative; therefore, the second rear lens L7 is a biconvex lens. By analogy, it will not be repeated here.

[0073] Furthermore, Table 3 below lists the quadratic surface coefficient value K and the aspherical coefficients A to F of the aspherical surfaces of the fourth front lens L4 and the second rear lens L7. The aspherical polynomial can be expressed by the following relational formula (6):

[0074]

[0075]

[0076] Among them, in the above relational formulas (6) and (7), X can be the offset (sag) in the direction of the optical axis P; C can be the reciprocal of the radius of the osculating sphere, that is, the reciprocal of the radius of curvature near the optical axis T; K can be the quadratic surface coefficient; Y can be the aspherical height, that is, the height from the center of the lens to the edge of the lens; A to H respectively represent the aspherical coefficients of each order of the aspherical polynomial.

[0077] Table 3

[0078]

[0079] Furthermore, the depression amount Z of the surface parallel to the Z axis of each non-rotationally symmetric lens (i.e., XY polynomial free surface (XY Polynomial)) of the optical lens Z1 of the present application satisfies the following relational formula:

[0080]

[0081]

[0082] Among them, in the above relationship formula (8), c can be the vertex curvature; K can be the conic constant; cj can be the coefficient; r can be the radial distance of the lens; p and q can be the coefficients.

[0083] According to the above content, the data of the XY polynomial free-form surface of the third front lens L3 of the optical lens Z1 of the present application can be seen in Table IV below; among them, C1 to C66 in Table IV can be the coefficients.

[0084] Table IV

[0085]

[0086]

[0087]

[0088]

[0089] Next, please refer to Figure 5 . Figure 5 A graph showing the relationship between the field of view (FOV) and the image point (Imageheight) of the optical lens Z1 of the present application. Figure 5 Taking the optical axis P as the origin (0, 0), in the four quadrants of the image plane, image points are plotted at intervals of 10° of the viewing angle; among them, in Figure 5 , a represents a half viewing angle of 10 degrees, b represents a half viewing angle of 20 degrees, and so on, and i represents a half viewing angle of 90 degrees. Compared with the usual rotationally symmetric lens, it can be seen that the optical lens Z1 of the present application can magnify the shape of the image plane, can effectively utilize the photosensitive surface area of the rectangular imaging component M, and further can make the image of the peripheral part far from the optical axis P be magnified more than the image of the central part near the optical axis P. According to the above content, the imaging data of each half viewing angle of the optical lens Z1 of the present application in the vertical and horizontal directions can be seen in Table V below. Therefore, the value obtained by the optical lens Z1 of the present application according to the relationship formula (4) is 1.11, and the value obtained according to the relationship formula (5) is 1.64.

[0090] Table V

[0091]

[0092]

[0093] Please refer to again Figure 5and Table 5. In this embodiment, when the half-angle of the optical lens Z1 is 10 degrees, the imaging width in the vertical direction can be 0.273 mm, and the imaging width in the horizontal direction can be 0.308 mm. By analogy, the imaging widths in the vertical and horizontal directions for other half-angles will not be repeated here.

[0094] Thus, through the above technical solution, the optical lens Z1 of this application introduces a non-rotationally symmetric lens (i.e., a free-form lens asymmetric with respect to the optical axis P), making the EFL (effective focal length of the optical lens Z1) different in the horizontal / vertical directions, and thus realizing an elliptical image circle. Moreover, when the imaging component M (such as a sensor) is rectangular, the elliptical image circle can achieve better pixel utilization compared to the traditional circular image circle.

[0095] Second Embodiment

[0096] Please refer to Figure 6 and Figure 7 , which are respectively the schematic structural configuration diagrams of one perspective and another perspective of the optical lens of the second embodiment of this application. The optical lens Z2 in this embodiment is substantially similar to the optical lens Z1 in the above first embodiment. Therefore, the settings or operations of the same components will not be repeated here. The difference between this embodiment and the above first embodiment is that in this embodiment, the third front lens L3 can be an anamorphic aspheric surface lens.

[0097] In this embodiment, the actual design of each lens component of the optical lens Z2 can be seen in Table 6 below. The interpretation method of Table 5 is the same as that of Table 2, so it will not be elaborated here.

[0098] Table 6

[0099]

[0100]

[0101] Furthermore, Table 7 below lists the conic coefficient value K and the aspheric coefficients A to F of the aspheric surfaces of the fourth front lens L4 and the second rear lens L7.

[0102] Table 7

[0103]

[0104] Furthermore, the third front lens L3 (i.e., the anamorphic aspheric lens) of the optical lens Z2 in this embodiment satisfies the following relationship:

[0105]

[0106] Among them, in the above relationship formula (9), Cx can be the curvature in the X direction; Cy can be the curvature in the Y direction; Kx can be the conic coefficient in the X direction; Ky can be the conic coefficient in the Y direction; X can be the distance of the lens in the X direction; Y can be the distance of the lens in the Y direction.

[0107] According to the above content, the aspheric data of the third front lens L3 of the optical lens Z2 of the present application can be seen in Table VIII below.

[0108] Table VIII

[0109]

[0110] In the above Table VIII, AR, BR, CR, DR, AP, BP, CP, DP can be coefficients.

[0111] According to the above content, the imaging data of each half-angle of the optical lens Z2 of the present application in the vertical direction and the horizontal direction can be seen in Table IX below. Therefore, the value obtained by the optical lens Z2 of the present application according to the relationship formula (4) is 1.01, and the value obtained according to the relationship formula (5) is 1.59.

[0112] Table IX

[0113]

[0114] Please refer back to Figure 3 and Table IX. In this embodiment, when the half-angle of the optical lens Z2 is 10 degrees, the imaging width in the vertical direction can be 0.282 mm, and the imaging width in the horizontal direction can be 0.313 mm. By analogy, the imaging widths of other half-angles in the vertical direction and the horizontal direction will not be repeated here.

[0115] It should be noted that the optical lens Z2 of this embodiment can also have half-field angles in both the horizontal direction and the vertical direction greater than 90°, can cover a wide viewing angle, and satisfy the foregoing relationship formulas (1), (2), and (3). In this embodiment, the parameters of the optical lens Z2 are preferably as shown in Table X below, but not limited thereto. Therefore, the value obtained by the optical lens Z2 of the present application according to the relationship formula (1) is 1.11, the value obtained according to the relationship formula (2) is -7.3%, and the value obtained according to the relationship formula (3) is 8.4%.

[0116] Table X

[0117]

[0118]

[0119] In addition, please refer to Figure 3 , Figure 4 ,Figure 8 and Figure 9 are, respectively, the longitudinal aberration diagram of the optical lens Z1 of the first embodiment, the astigmatic field curvature and distortion diagrams of the optical lens Z1 of the first embodiment, the longitudinal aberration diagram of the optical lens Z1 of the second embodiment, and the astigmatic field curvature and distortion diagrams of the optical lens Z1 of the second embodiment.

[0120] Figure 3 and Figure 8 are, respectively, the longitudinal aberration diagrams of the optical lenses (Z1, Z2), which show the longitudinal aberration (longitudinal aberration, also known as axial aberration) of the light rays with different pupil heights intersecting the optical axis for each wavelength. The horizontal axis represents the distance (mm) from the image plane of different wavelengths to the intersection point of the light ray and the optical axis, and the vertical axis represents the normalized entrance pupil height. Different line styles represent the measurement situations at different wavelengths. And Figure 4 and Figure 9 are, respectively, the astigmatic field curvature and distortion diagrams of the optical lenses (Z1, Z2); among them, in Figure 4 , Figure 9 the left diagram is the astigmatic field curvature diagram of the optical lenses (Z1, Z2), where the horizontal axis represents the focus displacement amount (mm), the vertical axis represents the image height, T represents the curve in the meridian direction, and S represents the curve in the sagittal direction; and in Figure 4 , Figure 9 the right diagram is the distortion diagram of the optical lenses (Z1, Z2), where the horizontal axis represents the distortion percentage (%), the vertical axis represents the image height, and different line styles represent the measurement situations at different wavelengths. And, in Figure 3 , the line W1 represents a wavelength of 555 nm, the line W2 represents a wavelength of 610 nm, the line W3 represents a wavelength of 510 nm, the line W4 represents a wavelength of 650 nm, and the line W5 represents a wavelength of 470 nm; and in Figure 8 , the line W1 represents a wavelength of 610 nm, the line W2 represents a wavelength of 650 nm, the line W3 represents a wavelength of 555 nm, the line W4 represents a wavelength of 510 nm, and the line W5 represents a wavelength of 470 nm. Thus, Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 8 and Figure 9 show that the longitudinal aberration, astigmatic field curvature, and distortion of the optical lenses (Z1, Z2) of the present application are all within the standard range between wavelengths of 450 nanometers and 650 nanometers. Therefore, the optical lenses (Z1, Z2) of the present application have good optical imaging quality.

[0121] However, the examples given above are only one feasible embodiment and are not intended to limit this application.

[0122] Advantageous Effects of the Embodiment

[0123] One of the advantageous effects of this application is that the optical lenses (Z1, Z2) provided by this application can adopt the technical solution of "the front lens group G1 includes a plurality of front lens elements arranged in sequence from the object side F1 to the image side F2, and the second lens and the third lens among the plurality of front lens elements are non-rotationally symmetric lenses. The rear lens group G2 includes at least one rear lens element, and at least one rear lens element is a cemented lens. The aperture A is located between the front lens group G1 and the rear lens group G2. Among them, the half field of view angles of the optical lens Z1 in the horizontal direction and the vertical direction are both greater than 90°, and the following relational expressions are satisfied: EFLX / EFLY > 1.1; EFLY / F2Y - EFLX / F2X < -5%; and EFLY / F3Y - EFLX / F3X > 5%; where EFLX is the effective focal length of the optical lens (Z1, Z2) in the horizontal direction, EFLY is the effective focal length of the optical lens (Z1, Z2) in the vertical direction, F2X is the effective focal length of the second lens in the horizontal direction, F2Y is the effective focal length of the second lens in the vertical direction, F3X is the effective focal length of the third lens in the horizontal direction, and F3Y is the effective focal length of the third lens in the vertical direction" to improve the pixel utilization rate.

[0124] Furthermore, through the above technical solution, the optical lenses (Z1, Z2) of this application are provided with two non-rotationally symmetric lenses (i.e., the second front lens L2 and the third front lens L) to make the EFL (effective focal length of the optical lens (Z1, Z2)) in the horizontal direction / vertical direction different, thereby realizing an elliptical image circle. And when the imaging component M is rectangular, the optical lenses (Z1, Z2) of this application can achieve better pixel utilization rate compared with the traditional fish-eye lens with a circular image circle.

[0125] The content disclosed above is only the preferred feasible embodiment of this application, and does not limit the protection scope of the claims of this application. Therefore, all equivalent technical changes made by using the content of the specification and drawings of this application are included in the protection scope of the claims of this application.

[0126] The above-described embodiments and / or implementation manners are only used to illustrate the preferred embodiments and / or implementation manners for implementing the technology of this application, and do not impose any formal restrictions on the implementation manners of the technology of this application. Any person skilled in the art, without departing from the scope of the technical means disclosed in the content of this application, may make some changes or modifications to other equivalent embodiments, but should still be regarded as the same technology or embodiment as this application in essence.

Claims

1. An optical lens, characterized in that, Comprising: A front lens group, the front lens group including a plurality of front lens elements arranged in sequence from the object side to the image side, the second lens and the third lens among the plurality of front lens elements being non-rotationally symmetric lenses; A rear lens group, the rear lens group including at least one rear lens element, at least one of the rear lens elements being a cemented lens; And An aperture, the aperture being located between the front lens group and the rear lens group; Wherein, the half field angles of the optical lens in the horizontal direction and the vertical direction are both greater than 90°, and satisfy the following relational expressions: EFLX / EFLY > 1.1; EFLY / F2Y - EFLX / F2X < -5%; and EFLY / F3Y - EFLX / F3X > 5%; Wherein, EFLX is the effective focal length of the optical lens in the horizontal direction, EFLY is the effective focal length of the optical lens in the vertical direction, F2X is the effective focal length of the second lens in the horizontal direction, F2Y is the effective focal length of the second lens in the vertical direction, F3X is the effective focal length of the third lens in the horizontal direction, and F3Y is the effective focal length of the third lens in the vertical direction.

2. The optical lens according to claim 1, wherein The plurality of front lens elements include a first front lens, a second front lens, a third front lens, a fourth front lens, and a fifth front lens arranged in sequence from the object side to the image side, the second front lens and the third front lens being the non-rotationally symmetric lenses, the third front lens having a convex surface facing the object side, and the fourth front lens having a convex surface facing the image side.

3. The optical lens according to claim 2, characterized in that, The first front lens and the fifth front lens are made of glass.

4. The optical lens according to claim 2, characterized in that, The fourth front lens is an aspherical lens.

5. The optical lens according to claim 1, characterized in that, The rear lens group includes a plurality of the rear lens elements, the plurality of rear lens elements including a first rear lens and a second rear lens arranged in sequence from the object side to the image side, the first rear lens being the cemented lens.

6. The optical lens according to claim 5, characterized in that, The first rear lens includes a front lens, an intermediate lens, and a rear lens, the front lens being connected to one surface of the intermediate lens, and the rear lens being connected to the other surface of the intermediate lens.

7. The optical lens according to claim 5, characterized in that, The second rear lens is an aspherical lens.

8. The optical lens according to claim 1, wherein, The optical lens satisfies the following relational expression: H90 / H10 > 1.3; Wherein, H90 is the imaging width of the horizontal half field angle from 80° to 90°, and H10 is the imaging width of the horizontal half field angle from 0° to 10°.

9. The optical lens according to claim 1, wherein The optical lens satisfies the following relational expression: V90 / V10 > 1.05; Wherein, V90 is the imaging width of the vertical half field angle from 80° to 90°, and V10 is the imaging width of the vertical half field angle from 0° to 10°.

10. The optical lens according to claim 1, characterized in that, Each of the non-rotationally symmetric lenses satisfies the following relational expression: Wherein, c is the vertex curvature, K is the conic constant, and cj is the coefficient.

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