Imaging optical lens

Abstract

An imaging optical lens (10), which relates to the field of optical lenses and is composed of a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4) and a prism (P1), which are arranged in sequence from an object side to an image side, wherein the focal length and the total optical length of the imaging optical lens (10) are respectively defined as f and TTL, the focal length of the first lens (L1) is defined as f1, the combined focal length of the first two lenses (L1, L2) is defined as f12, the combined focal length of the last three lenses (L2, L3, L4) is defined as f234, the central radii of curvature of an object-side surface and an image-side surface of the first lens (L1) are respectively defined as R1 and R2, the axial thicknesses of the first lens (L1) and the third lens (L3) are respectively defined as d1 and d5, and the axial distance from the object-side surface of the first lens (L1) to the image-side surface of the fourth lens (L4) is defined as Td, satisfying the following relational expressions: 0.30≤f1 / f≤0.70; -1.40≤f12 / f234≤-0.04; -3.00≤R1 / R2≤-1.00; 0.16≤Td / TTL≤0.21; and 0.05≤d5 / ET3≤0.66.

Description

Camera optical lens Technical Field

[0001] This invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for handheld terminal devices such as smartphones and digital cameras, as well as camera devices such as monitors and PC lenses. Background Technology

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized camera lenses has been increasing. Due to the shrinking pixel size of image sensors and the current trend in electronic products towards high functionality and lightweight portability, miniaturized camera lenses with good image quality have become mainstream in the market. To achieve better image quality, multi-element lens structures are often used. Furthermore, with technological advancements and increasingly diverse user needs, as the pixel area of ​​image sensors continues to shrink and system requirements for image quality continue to rise, structures combining lenses and prisms are gradually appearing in lens designs. There is an urgent need for periscope telephoto camera lenses with excellent optical characteristics, small size, and fully corrected aberrations. Summary of the Invention

[0003] To address the aforementioned problems, the main objective of this invention is to provide a camera optical lens that possesses excellent optical performance while meeting the design requirements of telephoto and miniaturization.

[0004] To achieve the above objectives, the present invention provides a camera optical lens, comprising a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a prism with reflective power, arranged sequentially from the object side to the image side; wherein, the prism along the optical axis includes: a first penetrating surface, a first reflecting surface, a second reflecting surface, a third reflecting surface, and a second penetrating surface, the first penetrating surface, the second reflecting surface, and the second penetrating surface are parallel to each other; wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the combined focal length of the first lens and the second lens is f12, and the combined focal length of the second lens, the third lens, and the fourth lens is f12. The first lens has a central radius of curvature of f234, an object-side radius of curvature of R1, an image-side radius of curvature of R2, an axial thickness of d5, a distance ET3 between the maximum effective aperture of the object-side and image-side of the third lens in a direction parallel to the optical axis, an axial distance Td between the object-side and image-side of the fourth lens, and a total optical length TTL, satisfying the following relationships: 0.30≤f1 / f≤0.70; -1.40≤f12 / f234≤-0.04; -3.00≤R1 / R2≤-1.00; 0.16≤Td / TTL≤0.21; 0.05≤d5 / ET3≤0.66.

[0005] Preferably, the on-axis thickness of the third lens is d5, the on-axis thickness of the fourth lens is d7, and the following relationship is satisfied: 0.70≤d5 / d7≤0.80.

[0006] Preferably, the camera optical lens satisfies the following relationship: 2.7≤(R1-R2) / f1≤3.2.

[0007] Preferably, the object-side surface of the first lens is convex near the axis, and the image-side surface of the first lens is convex near the axis; the axial thickness of the first lens is d1, and satisfies the following relationship: 0.046≤d1 / TTL≤0.051.

[0008] Preferably, the image-side surface of the second lens is concave near the axis; the focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, and the on-axis thickness of the second lens is d3, and the following relationships are satisfied: -1.94≤f2 / f≤-0.58; -0.68≤(R3+R4) / (R3-R4)≤8.29; 0.016≤d3 / TTL≤0.034.

[0009] Preferably, the focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, and the central radius of curvature of the image side of the third lens is R6, and the following relationships are satisfied: -0.90≤f3 / f≤-0.41; -5.51≤(R5+R6) / (R5-R6)≤1.34; 0.018≤d5 / TTL≤0.024.

[0010] Preferably, the image-side surface of the fourth lens is convex near the axis; the focal length of the fourth lens is f4, the central radius of curvature of the object-side surface of the fourth lens is R7, the central radius of curvature of the image-side surface of the fourth lens is R8, and the axial thickness of the fourth lens is d7, and satisfies the following relationships: 0.72≤f4 / f≤1.02; 0.97≤(R7+R8) / (R7-R8)≤2.39; 0.024≤d7 / TTL≤0.030.

[0011] Preferably, the ratio of the focal length of the camera optical lens to the diameter of the incident pupil is FNO, and satisfies the following condition: FNO≤2.90.

[0012] Preferably, the image height of the camera optical lens is IH, and satisfies the following condition: TTL / IH≤5.26.

[0013] Preferably, the prism and / or the first lens are made of glass.

[0014] The beneficial effects of the present invention are as follows: the camera optical lens according to the present invention has excellent optical characteristics, and has the characteristics of long focal length and miniaturization, and is especially suitable for mobile phone camera optical lens assemblies and WEB camera optical lenses composed of high-pixel CCD, CMOS and other camera elements. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0016] Figure 1 is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention;

[0017] Figure 2 is a schematic diagram of the propagation of multiple light beams in the camera optical lens shown in Figure 1;

[0018] Figure 3 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 1;

[0019] Figure 4 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 1;

[0020] Figure 5 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 1;

[0021] Figure 6 is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;

[0022] Figure 7 is a schematic diagram of the propagation of multiple light beams in the camera optical lens shown in Figure 6;

[0023] Figure 8 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 6;

[0024] Figure 9 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 6;

[0025] Figure 10 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 6;

[0026] Figure 11 is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;

[0027] Figure 12 is a schematic diagram of the propagation of multiple light beams in the camera optical lens shown in Figure 11;

[0028] Figure 13 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 11;

[0029] Figure 14 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 11;

[0030] Figure 15 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 11;

[0031] Figure 16 is a schematic diagram of the structure of the camera optical lens in the fourth embodiment;

[0032] Figure 17 is a schematic diagram of the propagation of multiple light beams in the camera optical lens shown in Figure 16;

[0033] Figure 18 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 16;

[0034] Figure 19 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 16;

[0035] Figure 20 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 16;

[0036] Figure 21 is a schematic diagram of the structure of the camera optical lens in the comparative embodiment;

[0037] Figure 22 is a schematic diagram of the propagation of multiple light beams in the camera optical lens shown in Figure 21;

[0038] Figure 23 is a schematic diagram of the axial aberration of the camera optical lens shown in Figure 21;

[0039] Figure 24 is a schematic diagram of the magnification chromatic aberration of the camera optical lens shown in Figure 21;

[0040] Figure 25 is a schematic diagram of the field curvature and distortion of the camera optical lens shown in Figure 21. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0042] Referring to Figures 1, 6, 11, and 16, the technical solution of the present invention provides a camera optical lens 10, 20, 30, and 40. The camera optical lens 10, 20, 30, and 40 comprises, in sequence from the object side to the image side, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a prism with reflective power.

[0043] The focal lengths of the imaging optical lenses 10, 20, 30, and 40 are defined as f, and the focal length of the first lens L1 is defined as f1, satisfying the following relationship 0.30 ≤ f1 / f ≤ 0.70, which specifies the ratio of the focal length of the first lens L1 to the focal lengths of the imaging optical lenses 10, 20, 30, and 40. By rationally allocating the optical focal lengths of the system, the imaging optical lenses 10, 20, 30, and 40 achieve better imaging quality and lower sensitivity.

[0044] The combined focal length of the first lens L1 and the second lens L2 is defined as f12, and the combined focal length of the second lens L2, the third lens L3, and the fourth lens L4 is defined as f234, satisfying the following relationship: -1.40≤f12 / f234≤-0.04. This defines the ratio of the combined focal length f12 of the first lens L1 and the second lens L2 to the combined focal length f234 of the second lens L2, the third lens L3, and the fourth lens L4. By reasonably allocating the optical focal length of the system, the system can achieve better imaging quality and lower sensitivity.

[0045] The central radius of curvature of the object side of the first lens L1 is defined as R1, and the central radius of curvature of the image side of the first lens L1 is defined as R2, satisfying the following relationship: -3.00≤R1 / R2≤-1.00. This specifies the ratio of the central radius of curvature of the object side to the central radius of curvature of the image side of the first lens L1, thus defining the shape of the first lens L1. This is beneficial for correcting astigmatism and distortion of the camera lens, ensuring that the distortion |Distortion|≤0.8%, and reducing the possibility of vignetting.

[0046] The axial distance from the object side of the first lens L1 to the image side of the fourth lens L4 is defined as Td, and the total optical length of the imaging optical lenses 10, 20, 30, and 40 is defined as TTL, satisfying the following relationship: 0.16≤Td / TTL≤0.21. This specifies the ratio of the axial distance from the object side of the first lens L1 to the image side of the fourth lens L4 to the total optical length of the imaging optical lens 10. Within the range specified by the condition, the front end length of the periscope lens can be controlled to be shorter, which helps to reduce the thickness of the lens module.

[0047] The axial thickness of the third lens L3 is defined as d5, and the distance from the maximum effective aperture on the object side to the maximum effective aperture on the image side of the third lens L3 in the direction parallel to the optical axis is ET3, satisfying the following relationship: 0.05≤d5 / ET3≤0.66. This specifies the ratio of the axial thickness of the third lens L3 to the distance from the maximum effective aperture on the object side to the maximum effective aperture on the image side of the third lens L3 in the direction parallel to the optical axis, which is helpful for the processing of the third lens L3 and beneficial for lens assembly.

[0048] Under the above conditions, the camera optical lenses 10, 20, 30, and 40 have good optical performance while meeting the design requirements of telephoto and miniaturization. Based on the characteristics of the camera optical lenses 10, 20, 30, and 40, they are particularly suitable for mobile phone camera optical lens assemblies and WEB camera optical lenses composed of high-pixel CCD, CMOS, and other camera elements.

[0049] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0050] The on-axis thickness of the third lens L3 is defined as d5, and the on-axis thickness of the fourth lens L4 is defined as d7, satisfying the following relationship: 0.70≤d5 / d7≤0.80. This specifies the ratio of the on-axis thickness of the third lens L3 to the on-axis thickness of the fourth lens L4. By reasonably allocating the thicknesses of the third lens L3 and the fourth lens L4, the molding difficulty in the lens production process is reduced, and the lens yield is improved.

[0051] The focal length of the first lens L1 is defined as f1, the central radius of curvature of the object side of the first lens L1 is R1, and the central radius of curvature of the image side of the first lens L1 is R2, satisfying the following relationship: 2.7≤(R1-R2) / f1≤3.2. This specifies the ratio of the central radius of curvature of the object side to the central radius of curvature of the image side of the first lens L1, thus defining the surface shape of the first lens L1. This can effectively reduce the sensitivity of the system, reduce the generation of stray light, thereby improving the overall imaging quality of the lens, and at the same time, it can also improve the manufacturing yield.

[0052] The object-side surface of the first lens L1 is convex near the axis, and the image-side surface of the first lens L1 is also convex near the axis. The object-side surface and image-side surface of the first lens L1 can also be configured with other concave and convex distributions.

[0053] The on-axis thickness of the first lens L1 is defined as d1, and the total optical length of the imaging optical lenses 10, 20, 30, and 40 is TTL, satisfying the following relationship: 0.046≤d1 / TTL≤0.051. Within the range of the condition, it is beneficial to achieve miniaturization.

[0054] The object-side surface of the second lens L2 is either convex or concave near the axis, and the image-side surface of the second lens L2 is concave near the axis. The image-side surface of the second lens L2 can also be configured as convex.

[0055] The focal lengths of the camera optical lenses 10, 20, 30, and 40 are defined as f, and the focal length of the second lens L2 is defined as f2, satisfying the following relationship: -1.94≤f2 / f≤-0.58. This specifies the ratio of the focal length f2 of the second lens L2 to the system focal length f. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0056] The central radius of curvature of the object side of the second lens L2 is R3, and the central radius of curvature of the image side of the second lens L2 is R4, satisfying the following relationship: -0.68≤(R3+R4) / (R3-R4)≤8.29. This defines the ratio of the sum of the central radius of curvature R3 of the object side and the central radius of curvature R4 of the image side of the second lens L2 to the difference between the central radius of curvature R3 of the object side and the central radius of curvature R4 of the image side of the second lens L2. This defines the shape of the second lens L2. Within the range specified by the condition, it is beneficial to correct on-axis chromatic aberration and improve the image quality of the system.

[0057] The on-axis thickness of the second lens L2 is d3, and the total optical length of the imaging optical lenses 10, 20, 30, and 40 is TTL, satisfying the following relationship: 0.016≤d3 / TTL≤0.034. Within the range of the condition, it is beneficial to achieve miniaturization.

[0058] The object side of the third lens L3 is either convex or concave near the axis, and the image side of the third lens L3 is either concave or convex near the axis.

[0059] The focal lengths of the camera optical lenses 10, 20, 30, and 40 are defined as f, and the focal length of the third lens L3 is defined as f3, satisfying the following relationship: -0.90≤f3 / f≤-0.41. This specifies the ratio of the focal length f3 of the third lens L3 to the system focal length f. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0060] The central radius of curvature of the object side of the third lens L3 is R5, and the central radius of curvature of the image side of the third lens L3 is R6, satisfying the following relationship: -5.51≤(R5+R6) / (R5-R6)≤1.34. This defines the shape of the third lens L3 and specifies the ratio of the sum of the central radii of curvature R5 and R6 of the object side of the third lens L3 to the difference between the central radii of curvature R5 and R6 of the image side of the third lens L3. This defines the shape of the third lens L3. Within the range specified by the condition, it is beneficial to the shaping of the third lens L3, which can mitigate the degree of light deflection after passing through the lens and effectively reduce aberrations.

[0061] The on-axis thickness of the third lens L3 is d5, and the total optical length of the camera optical lenses 10, 20, 30, and 40 is TTL, satisfying the following relationship: 0.018≤d5 / TTL≤0.024. Within the range of the condition, it is beneficial to achieve miniaturization.

[0062] The object-side surface of the fourth lens L4 is either convex or concave near the axis, and the image-side surface of the fourth lens L4 is convex near the axis. The image-side surface of the fourth lens L4 can also be set to be concave.

[0063] The focal lengths of the camera optical lenses 10, 20, 30, and 40 are defined as f, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 0.72≤f4 / f≤1.02. This specifies the ratio of the focal length f4 of the fourth lens L4 to the system focal length f. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0064] The central radius of curvature of the object side of the fourth lens L4 is R7, and the central radius of curvature of the image side of the fourth lens L4 is R8, satisfying the following relationship: 0.97≤(R7+R8) / (R7-R8)≤2.39. This specifies the ratio of the sum of the central radius of curvature R7 of the object side and the central radius of curvature R8 of the image side of the fourth lens L4 to the difference between the central radius of curvature R7 of the object side and the central radius of curvature R8 of the image side of the fourth lens L4. This defines the shape of the fourth lens L4, and within the range specified by the condition, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0065] The on-axis thickness of the fourth lens L4 is d7, and the total optical length of the camera optical lenses 10, 20, 30, and 40 is TTL, satisfying the following relationship: 0.024≤d7 / TTL≤0.030. Within the range of the condition, it is beneficial to achieve miniaturization.

[0066] In this invention, the first lens L1 is made of glass or plastic, the second lens L2, the third lens L3, and the fourth lens L4 are all made of plastic, and the prism P1 is made of glass. The lenses and prism P1 can also be made of other materials.

[0067] In this invention, an optical element such as an optical filter GF is disposed before the prism P1 and the image plane Si. The optical filter GF can be a glass cover or an optical filter. The optical filter GF can also be disposed in other positions.

[0068] In this invention, an aperture S1 is also provided, which is located between the third lens L3 and the fourth lens L4, or between the first lens L1 and the second lens L2. The aperture S1 can also be located in other positions.

[0069] Prism P1 has reflective power. Along the optical axis, prism P1 sequentially includes: a first penetrating surface T1, a first reflecting surface B1, a second reflecting surface B2, a third reflecting surface B3, and a second penetrating surface T2, wherein the first penetrating surface T1, the second reflecting surface B2, and the second penetrating surface T2 are arranged in parallel pairs. The optical axis includes a first optical axis I1, a second optical axis I2, a third optical axis I3, and a fourth optical axis I4. Optical axis I1 and optical axis I2 intersect at the first reflecting surface B1, the second optical axis I2 and the third optical axis I3 intersect at the second reflecting surface B2, and the third optical axis I3 and the fourth optical axis I4 intersect at the third reflecting surface B3; wherein the first optical axis I1 and the fourth optical axis I4 are parallel, and their directions are opposite. When the principal ray of the 0 field of view enters the camera optical lens 10 along the first optical axis I1, the ray will pass through the first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 in sequence. Then the ray is incident on the prism P1 through the first penetration surface T1. After being reflected by the first reflection surface B1, the ray travels along the second optical axis I2. After being reflected by the second reflection surface B2, the ray travels along the third optical axis I3. After being reflected by the third reflection surface RB3, the ray travels along the fourth optical axis I4. During its travel along the fourth optical axis I4, the ray exits from the second penetration surface T2 and passes through the optical filter GF to reach the image plane Si.

[0070] The image height of the camera optical lens 10 is IH, and the total optical length of the camera optical lens 10 is TTL, and satisfies the following relationship: TTL / IH≤5.26, which is beneficial for miniaturization.

[0071] The camera optical lens 10 has an aperture value FNO less than or equal to 2.90, thereby achieving a large aperture and good imaging performance.

[0072] The focal length of the camera optical lens is f, and the total optical length of the camera optical lens is TTL, satisfying the following relationship: f / TTL < 1.12, which is beneficial for the miniaturization of the telephoto system. Preferably, f / TTL < 0.75.

[0073] The camera optical lens of the present invention will be described below with examples. The symbols described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0074] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image surface Si), in mm;

[0075] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens;

[0076] Image height IH of 1.0 field of view: The field of view height corresponding to the effective pixel of the sensor (i.e., half the diagonal length of the effective pixel area of ​​the sensor);

[0077] 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor;

[0078] Image height IHm of MIC field of view: The field of view height extended beyond 1.0 to prevent assembly deviation;

[0079] FOVm: The field of view angle corresponding to the image height of the MIC field of view.

[0080] The technical solution of the present invention will be described in detail below with four embodiments. At the same time, a comparative embodiment is provided for reference. The technical effects of the present invention cannot be achieved when the above-described conditions are not met.

[0081] (First Implementation)

[0082] The first lens L1 has positive refractive power and is made of plastic. Its object side is convex near the axis, and its image side is convex near the axis.

[0083] The second lens L2 has negative refractive power and is made of plastic. Its object side is convex near the axis, and its image side is concave near the axis.

[0084] The third lens L3 has negative refractive power and is made of plastic. Its object side is concave near the axis, and its image side is convex near the axis.

[0085] The fourth lens L4 has positive refractive power and is made of plastic. Its object side is concave near the axis, and its image side is convex near the axis.

[0086] The aperture S1 is positioned between the third lens L3 and the fourth lens L4.

[0087] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0088] Table 1

[0089] The meanings of each symbol are as follows.

[0090] S1: Aperture;

[0091] R: Radius of curvature at the center of the optical surface;

[0092] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0093] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0094] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0095] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0096] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0097] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0098] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0099] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0100] R9: The radius of curvature of the center of the first penetrating surface of prism P1;

[0101] R10: The radius of curvature of the center of the first reflecting surface of prism P1;

[0102] R11: The central radius of curvature of the second reflecting surface of prism P1;

[0103] R12: The central radius of curvature of the third reflecting surface of prism P1;

[0104] R13: The central radius of curvature of the second penetrating surface of prism P1;

[0105] R14: The center radius of curvature of the object side surface of the optical filter GF;

[0106] R15: Radius of curvature of the center of the image side of the optical filter GF;

[0107] d: Axial thickness of the lens, axial distance between lenses;

[0108] d0: The axial distance from aperture S1 to the object-side surface of the first lens L1;

[0109] d1: On-axis thickness of the first lens L1;

[0110] d2: The on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

[0111] d3: On-axis thickness of the second lens L2;

[0112] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0113] d5: On-axis thickness of the third lens L3;

[0114] d6: The on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

[0115] d7: On-axis thickness of the fourth lens L4;

[0116] d8: The on-axis distance from the image-side surface of the fourth lens L4 to the first penetrating surface of the prism P1;

[0117] d9: The on-axis distance of the principal ray of the field of view from the first penetrating surface of prism P1 to the first reflecting surface of prism P1;

[0118] d10: The on-axis distance of the principal ray of the field of view from the first reflecting surface of prism P1 to the second reflecting surface of prism P1;

[0119] d11: The on-axis distance of the principal ray of the field of view from the second reflecting surface of prism P1 to the third reflecting surface of prism P1.

[0120] d12: The on-axis distance of the principal ray of the 0 field of view from the third reflecting surface of prism P1 to the second penetrating surface of prism P1;

[0121] d13: The on-axis distance from the second penetrating surface of prism P1 to the object-side surface of optical filter GF;

[0122] d14: On-axis thickness of the optical filter GF;

[0123] d15: The axial distance from the image-side surface of the optical filter GF to the image plane Si;

[0124] nd: Refractive index of the d-line (the d-line represents green light with a wavelength of 550 nm);

[0125] nd1: The refractive index of the d-line of the first lens L1;

[0126] nd2: The refractive index of the d-line of the second lens L2;

[0127] nd3: The refractive index of the d-line of the third lens L3;

[0128] nd4: The refractive index of the d-line of the fourth lens L4;

[0129] nd5: The refractive index of the d-line of prism P1;

[0130] ndg: The refractive index of the d-line of the optical filter GF;

[0131] vd: Abbe number;

[0132] vd1: Abbe number of the first lens L1;

[0133] vd2: Abbe number of the second lens L2;

[0134] vd3: Abbe number of the third lens L3;

[0135] vd4: Abbe number of the fourth lens L4;

[0136] vd5: Abbe number of prism P1;

[0137] vdg: Abbe number of the GF of the optical filter.

[0138] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0139] Table 2

[0140] For convenience, the aspherical surfaces of each lens surface are those shown in formula (1) below. However, the present invention is not limited to the aspherical polynomial form represented by formula (1). z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0141] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and a tangent plane at the vertex of the aspheric optical axis).

[0142] Figures 3 and 4 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650nm, 610nm, 555nm, 510nm, and 470nm passes through the camera optical lens 10 of the first embodiment, respectively. Figure 5 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555nm passes through the camera optical lens 10 of the first embodiment. In Figure 5, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0143] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 4.217 mm, the image height IH of the 1.0 field of view is 3.277 mm, the field of view FOV of the 1.0 field of view is 29.81°, the image height Ihm of the MIC field of view is 3.575 mm, and the field of view FOVm of the MIC field of view is 32.35°. The camera optical lens 10 meets the design requirements of telephoto and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0144] (Second Implementation)

[0145] The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0146] Unlike the first embodiment, in this embodiment, the object-side surface of the second lens L2 is concave near the axis; the object-side surface of the third lens L3 is convex near the axis, and its image-side surface is concave near the axis; the object-side surface of the fourth lens L4 is convex near the axis; the first lens L1 is made of glass; and the aperture S1 is located between the first lens L1 and the second lens L2.

[0147] Figure 6 shows the camera optical lens 20 of the second embodiment of the present invention.

[0148] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0149] Table 3

[0150] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0151] Table 4

[0152] Figures 8 and 9 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the camera optical lens 20 of the second embodiment, respectively. Figure 10 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555 nm passes through the camera optical lens 20 of the second embodiment. In Figure 10, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0153] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 4.142 mm, the image height IH of the 1.0 field of view is 3.277 mm, the field of view FOV of the 1.0 field of view is 30.48°, the image height Ihm of the MIC field of view is 3.300 mm, and the field of view FOVm of the MIC field of view is 30.69°. The camera optical lens 20 meets the design requirements of telephoto and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0154] (Third Implementation)

[0155] The symbols in the third embodiment have the same meanings as those in the first embodiment.

[0156] Figure 11 shows the camera optical lens 30 of the third embodiment of the present invention.

[0157] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0158] Table 5

[0159] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0160] Table 6

[0161] Figures 13 and 14 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the camera optical lens 30 of the third embodiment, respectively. Figure 15 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555 nm passes through the camera optical lens 30 of the third embodiment. In Figure 15, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0162] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 4.167 mm, the image height IH of the 1.0 field of view is 3.277 mm, the field of view FOV of the 1.0 field of view is 30.15°, the image height Ihm of the MIC field of view is 3.300 mm, and the field of view FOVm of the MIC field of view is 30.35°. The camera optical lens 30 meets the design requirements of telephoto and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0163] (Fourth Implementation)

[0164] The symbols in the fourth embodiment have the same meanings as those in the first embodiment.

[0165] Unlike the first embodiment, in this embodiment, the object-side surface of the second lens L2 is concave near the axis; the object-side surface of the third lens L3 is convex near the axis, and its image-side surface is concave near the axis; the object-side surface of the fourth lens L4 is convex near the axis; and the aperture S1 is disposed between the first lens L1 and the second lens L2.

[0166] Figure 16 shows the camera optical lens 40 according to the fourth embodiment of the present invention.

[0167] Tables 7 and 8 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0168] Table 7

[0169] Table 8 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.

[0170] Table 8

[0171] Figures 18 and 19 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the camera optical lens 40 of the fourth embodiment, respectively. Figure 20 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555 nm passes through the camera optical lens 40 of the fourth embodiment. In Figure 20, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0172] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 4.282 mm, the image height IH of the 1.0 field of view is 3.277 mm, the field of view FOV of the 1.0 field of view is 29.50°, the image height Ihm of the MIC field of view is 3.300 mm, and the field of view FOVm of the MIC field of view is 29.69°. The camera optical lens 40 meets the design requirements of telephoto and miniaturization, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0173] Table 21, which appears later, shows the values ​​corresponding to various numerical values ​​and parameters specified in the conditional expressions in each of the three implementation methods.

[0174] (Comparative Implementation Methods)

[0175] The symbols in the comparative implementation method have the same meanings as those in the first implementation method.

[0176] Figure 21 shows the camera optical lens 50 of the comparative embodiment.

[0177] Tables 9 and 10 show the design data of the camera optical lens 50 of the comparative embodiment.

[0178] Table 9

[0179] Table 10 shows the aspherical data of each lens in the camera optical lens 50 of the comparative embodiment.

[0180] Table 10

[0181] Figures 23 and 24 show schematic diagrams of axial aberration and magnification chromatic aberration after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm passes through the imaging optical lens 50 of the comparative embodiment, respectively. Figure 25 shows schematic diagrams of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 50 of the comparative embodiment. In Figure 25, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0182] In the comparative embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 4.196 mm, the full field of view image height IH is 3.252 mm, and the diagonal field of view FOV is 29.96°.

[0183] Table 11 below lists the values ​​of each conditional expression in the comparative embodiment according to the above-described conditional expressions. Clearly, the Td / TTL value of 0.213 for the camera optical lens 50 in the comparative embodiment does not satisfy the condition 0.16≤Td / TTL≤0.21. Therefore, the various aberrations of the camera optical lens 50 in the comparative embodiment are not adequately corrected, and it does not possess excellent optical characteristics.

[0184] Table 11

[0185] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens characterized in that, The camera optical lens consists of a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a prism with reflective power, arranged sequentially from the object side to the image side. The prism along the optical axis includes: a first penetrating surface, a first reflecting surface, a second reflecting surface, a third reflecting surface, and a second penetrating surface, wherein the first penetrating surface, the second reflecting surface, and the second penetrating surface are parallel to each other; Wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the combined focal length of the first lens and the second lens is f12, the combined focal length of the second lens, the third lens and the fourth lens is f234, the central radius of curvature of the object-side surface of the first lens is R1, the central radius of curvature of the image-side surface of the first lens is R2, the axial thickness of the third lens is d5, the distance from the maximum effective aperture of the object-side surface of the third lens to the maximum effective aperture of the image-side surface of the third lens in the direction parallel to the optical axis is ET3, the axial distance from the object-side surface of the first lens to the image-side surface of the fourth lens is Td, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.30≤f1 / f≤0.70; -1.40≤f12 / f234≤-0.04; -3.00≤R1 / R2≤-1.00; 0.16≤Td / TTL≤0.21; 0.05≤d5 / ET3≤0.

66.

2. The camera optical lens according to claim 1, wherein, The on-axis thickness of the third lens is d5, and the on-axis thickness of the fourth lens is d7, and they satisfy the following relationship: 0.70≤d5 / d7≤0.

80.

3. The camera optical lens according to claim 1, wherein, The camera optical lens satisfies the following relationship: 2.70≤(R1-R2) / f1≤3.

20.

4. The camera optical lens according to claim 1, characterized in that, The object-side surface of the first lens is convex at the paraxial position, and the image-side surface of the first lens is convex at the paraxial position. The first lens has an axial thickness of d1 and satisfies the following relationship: 0.046≤d1 / TTL≤0.

051.

5. The camera optical lens according to claim 1, wherein, The image-side surface of the second lens is concave near the axis; The focal length of the second lens is f2, the central radius of curvature of the object side of the second lens is R3, the central radius of curvature of the image side of the second lens is R4, and the axial thickness of the second lens is d3, satisfying the following relationship: -1.94≤f² / f≤-0.58; -0.68≤(R3+R4) / (R3-R4)≤8.29; 0.016≤d3 / TTL≤0.

034.

6. The camera optical lens according to claim 1, characterized in that, The third lens has a focal length of f3, a central radius of curvature of the object-side surface of the third lens of R5, and a central radius of curvature of the image-side surface of the third lens of R6, and satisfies the following relationship: -0.90≤f3 / f≤-0.41; -5.51≤(R5+R6) / (R5-R6)≤1.34; 0.018≤d5 / TTL≤0.

024.

7. The camera optical lens according to claim 1, wherein, The image-side surface of the fourth lens is convex at the paraxial position; A focal length of the fourth lens is f4, a central curvature radius of an object side surface of the fourth lens is R7, a central curvature radius of an image side surface of the fourth lens is R8, an on-axis thickness of the fourth lens is d7, and the following relational expressions are satisfied: 0.72 ≤ f4 / f ≤ 1.02; 0.97 ≤ (R7+R8) / (R7-R8) ≤ 2.39; 0.024 ≤ d7 / TTL ≤ 0.

030.

8. The camera optical lens according to claim 1, characterized in that, A ratio of a focal length and an entrance pupil diameter of the imaging optical lens is FNO, and the following conditional expression is satisfied: FNO ≤ 2.

90.

9. The camera optical lens according to claim 1, characterized in that, An image height of the imaging optical lens is IH, and the following condition is satisfied: TTL / IH ≤ 5.

26.

10. The camera optical lens according to claim 1, characterized in that, The prism and / or the first lens is made of glass.

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