Camera lens

Abstract

The application relates to the field of optical lenses and discloses a camera optical lens, which is sequentially arranged from the object side to the image side and comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power and a triangular prism with negative refractive power; wherein the on-axis distance from the object side of the first lens to the image side of the third lens is D, the total optical length of the camera optical lens is TTL, the Abbe number of the glass lens of the camera optical lens is vdi, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the on-axis thickness of the second lens is d3, the on-axis thickness of the third lens is d5, the on-axis distance from the image side of the second lens to the object side of the third lens is d4, the combined focal length of the second lens and the third lens is f23, the curvature radius of the object side of the third lens is R5, the curvature radius of the image side of the third lens is R6, and the following relationships are met: 0.14 <= D / TTL <= 0.46; 40.00 <= vdi <= 82.00; 0.30 <= f1 / f <= 0.70; -32.08 <= f23 / (D3+D4+D5) <= -3.00; and 1.40 <= (R5+R6) / (R5-R6) <= 20.00.

Description

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. Furthermore, due to the shrinking pixel size of image sensors and the current trend of electronic products prioritizing high functionality and lightweight portability, miniaturized camera lenses with good image quality have become mainstream in the market. Telephoto camera lenses can meet consumers' needs for shooting specific targets. Traditional telephoto camera lenses have an excessively large optical length, failing to meet the design requirements of slim and lightweight smartphones. Periscope telephoto camera lens designs can significantly shorten the overall optical length of the camera lens while still meeting telephoto design requirements. However, the optical performance of existing periscope telephoto camera lenses still cannot meet the demands. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a camera optical lens that can achieve high imaging performance while satisfying the requirements of a large aperture periscope design.

[0004] To address the aforementioned technical problems, embodiments of the present invention provide a camera optical lens, comprising, 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, and a prism with negative refractive power; at least one of the first lens, the second lens, and the third lens is a glass lens; the prism is made of plastic; wherein, the total length of the lens group of the camera optical lens along the axis from the object side of the first lens to the image side of the third lens is D, the total optical length of the camera optical lens is TTL, the Abbe number of the glass lens of the camera optical lens is vdi, and the focal length of the camera optical lens is... Let f be the focal length of the first lens, f1 be the focal length of the second lens, d3 be the axial thickness of the third lens, d5 be the axial thickness of the third lens, d4 be the axial distance from the image side of the second lens to the object side of the third lens, f23 be the combined focal length of the second and third lenses, R5 be the radius of curvature of the object side of the third lens, and R6 be the radius of curvature of the image side of the third lens, satisfying the following relationships: 0.14≤D / TTL≤0.46; 40.00≤vdi≤82.00; 0.30≤f1 / f≤0.70; -32.08≤f23 / (d3+d4+d5)≤-3.00; 1.40≤(R5+R6) / (R5-R6)≤20.00.

[0005] Preferably, the image height of the 1.0 field of view of the camera optical lens is IH, the field of view angle of the 1.0 field of view of the camera optical lens is FOV, and the following relationship is satisfied: 2.10≤IH*f / FOV≤6.10.

[0006] Preferably, the axial thickness of the first lens is d1, and satisfies the following relationship: 3.10≤f1 / d1≤5.60.

[0007] Preferably, the object-side surface of the first lens is convex near the axis; the radius of curvature of the object-side surface of the first lens is R1, the radius of curvature of the image-side surface of the first lens is R2, and the axial thickness of the first lens is d1, and they satisfy the following relationships: -3.03≤(R1+R2) / (R1-R2)≤-0.16; 0.065≤d1 / TTL≤0.132.

[0008] Preferably, the focal length of the second lens is f2, the radius of curvature of the object side of the second lens is R3, and the radius of curvature of the image side of the second lens is R4, and the following relationships are satisfied: -13.36≤f2 / f≤-0.55; -21.64≤(R3+R4) / (R3-R4)≤5.92; 0.018≤d3 / TTL≤0.066.

[0009] Preferably, the object-side surface of the third lens is convex at the paraxial position, and the image-side surface is concave at the paraxial position; the focal length of the third lens is f3, and satisfies the following relationships: -4.76≤f3 / f≤-0.33; 0.013≤d5 / TTL≤0.082.

[0010] Preferably, the aperture F-number of the camera optical lens is Fno, and satisfies the following relationship: Fno≤3.09.

[0011] Preferably, the total optical length TTL of the camera optical lens, the image height IH of the 1.0 field of view of the camera optical lens, and the following relationship are satisfied: TTL / IH≤7.22.

[0012] The beneficial effects of the present invention are as follows: the camera optical lens according to the present invention has excellent optical characteristics, meets the design requirements of large aperture, periscope telephoto and miniaturization, and is especially suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements. Attached Figure Description

[0013] 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:

[0014] Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention;

[0015] Figure 2 yes Figure 1 A schematic diagram of axial aberrations of the camera optical lens shown;

[0016] Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0017] Figure 4 yes Figure 1 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0018] Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;

[0019] Figure 6 yes Figure 5 A schematic diagram of axial aberrations of the camera optical lens shown;

[0020] Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0021] Figure 8 yes Figure 5 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0022] Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;

[0023] Figure 10 yes Figure 9 A schematic diagram of axial aberrations of the camera optical lens shown;

[0024] Figure 11 yes Figure 9 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0025] Figure 12 yes Figure 9 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0026] Figure 13This is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of the present invention;

[0027] Figure 14 yes Figure 13 A schematic diagram of axial aberrations of the camera optical lens shown;

[0028] Figure 15 yes Figure 13 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0029] Figure 16 yes Figure 13 The diagram shows the field curvature and distortion of the camera lens. Detailed Implementation

[0030] 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.

[0031] Referring to the accompanying drawings, the technical solution of the present invention provides a camera optical lens 10, 20, 30, 40. Figure 1 , 5 Figures 9 and 13 show the camera optical lenses 10, 20, 30, and 40 of the present invention. The camera optical lenses 10, 20, 30, and 40 are composed of a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, and a prism TP arranged sequentially from the object side to the image side.

[0032] The TP prism is made of plastic, which helps reduce costs.

[0033] The axial distance from the object side of the first lens of the camera optical lenses 10, 20, 30, and 40 to the image side of the third lens is defined as D. The total optical length of the camera optical lenses 10, 20, 30, and 40 is defined as TTL, satisfying the following relationship: 0.14≤D / TTL≤0.46. This specifies the ratio of the total length of the lens group to the total optical length of the system. Within the range of the condition, this helps to control the front end length of the periscope lens.

[0034] At least one of the first lens L1, the second lens L2, and the third lens L3 is a glass lens.

[0035] The Abbe number of the glass lens of the camera optical lens 10, 20, 30, and 40 is defined as vdi, which satisfies the following relationship: 40.00≤vdi≤82.00. At least one glass lens is used for the first three lenses. The Abbe number of the glass lens used is specified. Within this range, the material properties can be effectively allocated, the chromatic aberration can be effectively corrected, and the chromatic aberration |LC|≤2.0μm.

[0036] The focal lengths of the camera optical lenses 10, 20, 30, and 40 are defined as f, and the focal length of the first lens is defined as f1, satisfying the following relationship: 0.30 ≤ f1 / f ≤ 0.70, which specifies the ratio of the first lens to the total focal length of the system. By rationally allocating the optical focal length of the system, the system achieves better imaging quality and lower sensitivity.

[0037] The on-axis thickness of the second lens is defined as d3, the on-axis thickness of the third lens is defined as d5, the on-axis distance from the image side of the second lens to the object side of the third lens is defined as d4, and the combined focal length of the second and third lenses is defined as f23, satisfying the following relationship: -32.08≤f23 / (d3+d4+d5)≤-3.00. When the above conditions are met, it helps the rear lens maintain a sufficiently strong negative refractive force to correct the off-axis aberration at the image side, and at the same time, it can effectively shorten the total optical length to achieve miniaturization, thereby expanding the application range of the product.

[0038] The radius of curvature of the object side of the third lens is defined as R5, and the radius of curvature of the image side of the third lens is defined as R6, satisfying the following relationship: 1.40≤(R5+R6) / (R5-R6)≤20.00. This defines the shape of the third lens. Within the range of the condition, it is beneficial to mitigate the degree of light deflection after passing through the lens and can effectively reduce aberrations.

[0039] Under the above conditions, the camera optical lenses 10, 20, 30, and 40 have good optical performance while meeting the design requirements of large aperture, 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 lens assemblies and web camera lenses composed of high-pixel CCD, CMOS, and other camera elements.

[0040] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0041] The image height of a 1.0 field of view camera optical lens is defined as IH, and the field of view angle of a 1.0 field of view camera optical lens is defined as FOV. The following relationship is satisfied: 2.10≤IH*f / FOV≤6.10, which is conducive to miniaturization and wide-angle while ensuring imaging quality.

[0042] The on-axis thickness of the first lens L1 is defined as d1, which satisfies the following relationship: 3.10≤f1 / d1≤5.60. When f1 / d1 satisfies the above relationship, it helps to buffer the change of the incident angle of light, so that it can propagate smoothly in the camera optical lenses 10, 20, 30, and 40, while maintaining the refractive power of the first lens L1 to improve chromatic aberration and enhance image quality.

[0043] The object-side surface of the first lens L1 is convex at the paraxial position, and the image-side surface is either convex or concave at the paraxial position. The object-side surface of the first lens L1 can also be set to be concave.

[0044] The radius of curvature R1 of the object side of the first lens L1 and the radius of curvature R2 of the image side of the first lens L1 satisfy the following relationship: -3.03≤(R1+R2) / (R1-R2)≤-0.16. By reasonably controlling the shape of the first lens, the first lens can effectively correct the spherical aberration of the system.

[0045] The on-axis thickness of the first lens L1 is d1, and the total optical length of the overall imaging optical lenses 10, 20, 30, and 40 is TTL, satisfying the following relationship: 0.065≤d1 / TTL≤0.132, which is beneficial for achieving ultra-thinness.

[0046] The object side of the second lens L2 is either convex or concave near the axis, and the image side is either convex or concave near the axis.

[0047] The focal length of the second lens L2 is f2, and the focal lengths of the overall imaging optical lenses 10, 20, 30, and 40 are f, satisfying the following relationship: -13.36≤f2 / f≤-0.55. By controlling the negative optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the optical system.

[0048] The radius of curvature R3 of the object side of the second lens L2 and the radius of curvature R4 of the image side of the second lens L2 satisfy the following relationship: -21.64≤(R3+R4) / (R3-R4)≤5.92, which defines the shape of the second lens L2. When within this range, as lenses develop towards ultra-thin and wide-angle lenses, it is beneficial to correct on-axis chromatic aberration.

[0049] The total optical length of the overall camera optical lenses 10, 20, 30, and 40 is TTL, which satisfies the following relationship: 0.018≤d3 / TTL≤0.066, which is beneficial for achieving ultra-thin design.

[0050] The object-side surface of the third lens L3 is convex near the axis, and the image-side surface is concave near the axis. The object-side and image-side surfaces of the third lens L3 can also be configured with other concave and convex distributions.

[0051] The focal length of the third lens L3 is f3, and the focal lengths of the overall imaging optical lenses 10, 20, 30, and 40 are f, satisfying the following relationship: -4.76≤f3 / f≤-0.33. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0052] The total optical length of the overall camera optical lenses 10, 20, 30, and 40 is TTL, which satisfies the following relationship: 0.013≤d5 / TTL≤0.082, which is beneficial for achieving ultra-thin design.

[0053] By adding a prism (TP), the optical path can be redirected, thereby reducing the length of the entire optical system to adapt to the development trend of miniaturized and micro-miniaturized electronic devices.

[0054] The image height of the 1.0 field of view of the camera optical lenses 10, 20, 30, and 40 is IH, and the total optical length of the camera optical lenses 10, 20, 30, and 40 is TTL. The following relationship is satisfied: TTL / IH≤7.22, which is beneficial for miniaturization.

[0055] Camera optical lenses with apertures of 10, 20, 30, and 40mm have an aperture of F-number less than or equal to 3.09, providing large aperture and good imaging performance.

[0056] In this invention, an aperture S1 is provided on the object side and in front of the first lens L1. The aperture S1 can also be provided in other positions.

[0057] In this invention, an optical element such as an optical filter GF is disposed between the prism TP and the imaging surface Si. The optical filter GF can be a glass cover or an optical filter. The optical filter GF can also be disposed in other locations.

[0058] The camera optical lens 10 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, radius of curvature, and on-axis thickness are mm.

[0059] TTL: Optical Length (the axial distance from the object surface of the first lens L1 to the imaging surface Si), in mm.

[0060] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens.

[0061] 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);

[0062] 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor;

[0063] Image height IHm of MIC field of view: The field of view height extended beyond 1.0 to prevent assembly deviation;

[0064] FOVm: The field of view angle corresponding to the image height of the MIC field of view.

[0065] The technical solution of the present invention will be described in detail below with four implementation methods.

[0066] (First Implementation)

[0067] The first lens L1 has positive refractive power and is made of glass. Its object side is convex at the paraxial position, and its image side is convex at the paraxial position.

[0068] 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.

[0069] The third lens L3 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.

[0070] Tables 1, 2 and 3 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0071] Table 1

[0072]

[0073] The meanings of each symbol are as follows.

[0074] S1: Aperture;

[0075] R: Radius of curvature of the optical surface; for lenses, it is the central radius of curvature.

[0076] R1: Radius of curvature of the object side surface of the first lens L1;

[0077] R2: Radius of curvature of the image side of the first lens L1;

[0078] R3: Radius of curvature of the object side surface of the second lens L2;

[0079] R4: Radius of curvature of the image side of the second lens L2;

[0080] R5: Radius of curvature of the object side surface of the third lens L3;

[0081] R6: Radius of curvature of the image side of the third lens L3;

[0082] R7: Radius of curvature of the side surface of the prism TP;

[0083] R8: Radius of curvature of the side of the prism TP image;

[0084] R9: Radius of curvature of the object-side surface of the optical filter GF;

[0085] R10: Radius of curvature of the image-side surface of the optical filter GF;

[0086] d: The axial thickness of the lens and the axial distance between lenses;

[0087] d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1;

[0088] d1: On-axis thickness of the first lens L1;

[0089] 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;

[0090] d3: On-axis thickness of the second lens L2;

[0091] d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0092] d5: On-axis thickness of the third lens L3;

[0093] d6: The axial distance from the image-side surface of the third lens L3 to the object-side surface of the prism TP;

[0094] d7: On-axis thickness of prism TP;

[0095] d8: The axial distance from the image-side surface of the prism TP to the object-side surface of the optical filter GF;

[0096] d9: On-axis thickness of the optical filter GF;

[0097] d10: The axial distance from the image-side surface of the optical filter GF to the image plane;

[0098] nd: Refractive index of the d-line;

[0099] nd1: The refractive index of the d-line of the first lens L1;

[0100] nd2: The refractive index of the d-line of the second lens L2;

[0101] nd3: The refractive index of the d-line of the third lens L3;

[0102] nd4: The refractive index of the d-line of the prism TP;

[0103] ndg: The refractive index of the d-line of the optical filter GF;

[0104] vd: Abbe number;

[0105] vd1: Abbe number of the first lens L1;

[0106] vd2: Abbe number of the second lens L2;

[0107] vd3: Abbe number of the third lens L3;

[0108] vd4: Abbe number of prism TP;

[0109] vdg: Abbe number of the GF of the optical filter.

[0110] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0111] Table 2

[0112]

[0113]

[0114] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0115] 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

[0116] +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0117] 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).

[0118] Figure 2 , Figure 3 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 656nm, 588nm, 546nm, 486nm and 436nm passes through the camera optical lens 10 of the first embodiment. Figure 4 This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0119] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 6.363mm, the image height IH of the 1.0 field of view is 3.575mm, the field of view FOV of the 1.0 field of view is 21.79°, the image height IHm of the MIC field of view is 3.695mm, and the field of view FOVm of the MIC field of view is 22.48°. The camera optical lens 10 meets the design requirements of large aperture, long focal length, and miniaturization. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0120] (Second Implementation)

[0121] The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0122] Unlike the first embodiment, the image-side surface of the first lens L1 is concave near the axis.

[0123] Figure 5 The image shows the camera optical lens 20 according to the second embodiment of the present invention.

[0124] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0125] Table 3

[0126]

[0127]

[0128] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0129] Table 4

[0130]

[0131] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (2). However, the present invention is not limited to the aspherical polynomial form represented by formula (2).

[0132] 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

[0133] +A18r 18 +A20r 20 (2)

[0134] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 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).

[0135] Figure 6 , Figure 7 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 656nm, 588nm, 546nm, 486nm and 436nm passes through the camera optical lens 20 of the second embodiment. Figure 8 This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the camera optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0136] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 5.815mm, the image height IH of the 1.0 field of view is 3.575mm, the field of view FOV of the 1.0 field of view is 23.68°, the image height IHm of the MIC field of view is 3.695mm, and the field of view FOVm of the MIC field of view is 24.42°. The camera optical lens 20 meets the design requirements of large aperture, long focal length, and miniaturization. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0137] (Third Implementation)

[0138] The symbols in the third embodiment have the same meanings as those in the first embodiment.

[0139] Unlike the first embodiment, the object side of the second lens L2 is concave near the axis, and the image side is convex near the axis.

[0140] Figure 9The image shown is the camera optical lens 30 according to the third embodiment of the present invention.

[0141] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0142] Table 5

[0143]

[0144]

[0145] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0146] Table 6

[0147]

[0148] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (2). However, the present invention is not limited to the aspherical polynomial form represented by formula (2).

[0149] 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

[0150] +A18r 18 +A20r 20 (2)

[0151] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 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).

[0152] Figure 10 , Figure 11 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 656nm, 588nm, 546nm, 486nm and 436nm passes through the camera optical lens 30 of the third embodiment. Figure 12This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the camera optical lens 30 of the third embodiment. Figure 12 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 30 is 8.680mm, the image height IH of the 1.0 field of view is 3.575mm, the field of view FOV of the 1.0 field of view is 15.49°, the image height IHm of the MIC field of view is 3.695mm, and the field of view FOVm of the MIC field of view is 16.00°. The camera optical lens 30 meets the design requirements of large aperture, long focal length, and miniaturization. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0154] (Fourth Implementation)

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

[0156] Unlike the first embodiment, the object side of the second lens L2 is concave near the axis, and the image side is convex near the axis.

[0157] Figure 13 The image shown is the camera optical lens 40 according to the fourth embodiment of the present invention.

[0158] Tables 7 and 8 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0159] Table 7

[0160]

[0161]

[0162] Table 8 shows the aspherical data of each lens in the camera optical lens 40 of the fourth embodiment of the present invention.

[0163] Table 8

[0164]

[0165] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (2). However, the present invention is not limited to the aspherical polynomial form represented by formula (2).

[0166] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r8 +A10r 10 +A12r 12 +A14r 14 +A16r 16

[0167] +A18r 18 +A20r 20 (2)

[0168] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 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).

[0169] Figure 14 , Figure 15 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 656nm, 588nm, 546nm, 486nm and 436nm passes through the camera optical lens 40 of the fourth embodiment. Figure 16 This illustrates the field curvature and distortion of light with a wavelength of 546 nm after passing through the camera optical lens 40 of the fourth embodiment. Figure 16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0170] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 5.425mm, the image height IH of the 1.0 field of view is 3.575mm, the field of view FOV of the 1.0 field of view is 25.50°, the image height IHm of the MIC field of view is 3.695mm, and the field of view FOVm of the MIC field of view is 26.31°. The camera optical lens 40 meets the design requirements of large aperture, long focal length, and miniaturization. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0171] Table 9, which appears later, shows the values ​​corresponding to the various numerical values ​​and parameters specified in the conditional expressions in each of the first, second, third, and fourth implementation methods.

[0172] Table 9

[0173]

[0174]

[0175] 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 is composed of a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a triangular prism arranged in sequence from the object side to the image side; at least one of the first lens, the second lens, and the third lens is a glass lens; and the triangular prism is made of plastic; Wherein, the on-axis distance from the object side of the first lens to the image side of the third lens is D, the total optical length of the camera optical lens is TTL, the Abbe number of the glass lens of the camera optical lens is vdi, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the on-axis thickness of the second lens is d3, the on-axis thickness of the third lens is d5, the on-axis distance from the image side of the second lens to the object side of the third lens is d4, the combined focal length of the second lens and the third lens is f23, the curvature radius of the object side of the third lens is R5, the curvature radius of the image side of the third lens is R6, the image height of the camera optical lens at a 1.0 field of view is IH, the field of view angle of the camera optical lens at a 1.0 field of view is FOV, the on-axis thickness of the first lens is d1, and the following relationships are satisfied: 0.14≤D / TTL≤0.46; 40.00≤vdi≤82.00; 0.30≤f1 / f≤0.70; -32.08≤f23 / (d3+d4+d5)≤-3.00; 1.40≤(R5+R6) / (R5-R6)≤20.00; 2.10≤IH*f / FOV≤6.10; 3.10≤f1 / d1≤5.

60.

2. The camera optical lens according to claim 1, characterized in that, The object side of the first lens is convex at the near axis, the curvature radius of the object side of the first lens is R1, the curvature radius of the image side of the first lens is R2, and the following relationships are satisfied: -3.03≤(R1+R2) / (R1-R2)≤-0.16; 0.065≤d1 / TTL≤0.

132.

3. The camera optical lens according to claim 1, wherein, The focal length of the second lens is f2, the curvature radius of the object side of the second lens is R3, the curvature radius of the image side of the second lens is R4, and the following relationships are satisfied: -13.36≤f2 / f≤-0.55; -21.64≤(R3+R4) / (R3-R4)≤5.92; 0.018≤d3 / TTL≤0.

066.

4. The camera optical lens according to claim 1, characterized in that, The object side of the third lens is convex at the near axis, the image side of the third lens is concave at the near axis, the focal length of the third lens is f3, and the following relationships are satisfied: -4.76≤f3 / f≤-0.33; 0.013≤d5 / TTL≤0.

082.

5. The camera optical lens according to claim 1, characterized in that, The F number of the camera optical lens is Fno, and the following relationship is satisfied: Fno≤3.

09.

6. The camera optical lens according to claim 1, characterized in that, The total optical length TTL of the camera optical lens satisfies the following relationship: TTL / IH≤7.22.

Images