Camera lens

Abstract

The application relates to the field of optical lenses and discloses a camera optical lens which comprises a lens group, a prism group and an image plane in sequence from an object side to an image side, the lens group comprises four lenses in total, the four lenses are in sequence from the object side to the image side as follows: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power and a fourth lens with positive refractive power; the prism group is used for guiding light from the lens group to pass through the prism group and then to the image plane; wherein the total optical length of the camera optical lens is TTL, the focal length of the camera optical lens is f, the image height of a 1.0 field of view of the camera optical lens is IH, and the following relationships are met: 1.30 <= TTL / f <= 1.40; 70.00 <= 43.25f / (2IH) <= 90.00.

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. 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 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, while possessing excellent optical performance, meets the design requirements of large aperture, ultra-thin design, and miniaturization.

[0004] To achieve the above objectives, the present invention provides a camera optical lens, which comprises a lens group, a prism group, and an image plane sequentially from the object side to the image side. The lens group comprises four lenses, which are, in order 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 fourth lens with positive refractive power. The prism group is used to guide light propagating from the lens group through the prism group and guide it to the image plane. Wherein, the total optical length of the camera optical lens is TTL, the focal length of the camera optical lens is f, the image height of the camera optical lens in a 1.0 field of view is IH, and the following relationship is satisfied: 1.30≤TTL / f≤1.40; 70.00≤43.25 f / (2 IH)≤90.00.

[0005] Preferably, 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, and the axial thickness of the first lens is d1, satisfying the following relationship: 8.90≤(R1-R2) / d1≤12.50.

[0006] Preferably, the prism assembly includes a first prism and a second prism, wherein the first prism has positive refractive power and the second prism has negative refractive power; The first prism has a first incident surface, a first reflecting surface and a first exit surface in sequence along the optical path. After passing through the lens group, the light rays enter the first prism through the first incident surface along the first optical axis. At least a portion of the light rays passing through the first incident surface are reflected at the first reflecting surface and exit the first prism through the first exit surface along the second optical axis. The second prism has a second incident surface, a second reflecting surface and a second exiting surface in sequence along the optical path. After passing through the first prism, the light rays enter the second prism through the second incident surface along the second optical axis. At least a portion of the light rays passing through the second incident surface are reflected at the second reflecting surface and exit the second prism through the second exiting surface along the third optical axis to form an image on the image plane. The extension direction of the first optical axis and the extension direction of the third optical axis are both perpendicular to the extension direction of the second optical axis.

[0007] Preferably, 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 focal length of the first lens is f1, the central radius of curvature of the object side of the first lens is R1, the central radius of curvature of the image side of the first lens is R2, and the axial thickness of the first lens is d1, and the following relationship is satisfied: 0.25≤f1 / f≤0.30; 0.52≤(R1+R2) / (R1-R2)≤0.54; 0.056≤d1 / TTL≤0.083.

[0008] Preferably, the object-side surface of the second lens is concave at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position. 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: -0.38≤f² / f≤-0.33; 0.38≤(R3+R4) / (R3-R4)≤0.40; 0.017≤d3 / TTL≤0.020.

[0009] Preferably, the object-side surface of the third lens is convex at the paraxial position, and the image-side surface of the third lens is concave at the paraxial position. The focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, the central radius of curvature of the image side of the third lens is R6, and the axial thickness of the third lens is d5, and the following relationship is satisfied: -0.34≤f3 / f≤-0.29; 1.47≤(R5+R6) / (R5-R6)≤1.50; 0.017≤d5 / TTL≤0.021.

[0010] Preferably, the image-side surface of the fourth lens is convex at the paraxial position. The fourth lens has a focal length of f4, a central radius of curvature of the object side of the fourth lens of R7, a central radius of curvature of the image side of the fourth lens of R8, and an axial thickness of d7, and satisfies the following relationship: 0.35≤f4 / f≤0.40; -0.16≤(R7+R8) / (R7-R8)≤-0.10; 0.034≤d7 / TTL≤0.050.

[0011] Preferably, the ratio of the effective focal length to the entrance pupil diameter of the camera optical lens is FNO, and satisfies the following relationship: 2.84≤FNO≤2.86.

[0012] Preferably, 4.52≤TTL / IH≤5.39.

[0013] Preferably, the first lens, the second lens, the third lens, and the fourth lens are all made of plastic, and the prism assembly is 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, can reduce thickness, has the characteristics of large aperture, ultra-thin and miniaturized, and is easy to correct distortion and on-axis chromatic aberration. It 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

[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: Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention; Figure 2 yes Figure 1 A schematic diagram of axial aberrations of the camera optical lens shown. Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 4 yes Figure 1 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention; Figure 6 yes Figure 5 A schematic diagram of axial aberrations of the camera optical lens shown. Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 8 yes Figure 5 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention; Figure 10 yes Figure 9 A schematic diagram of axial aberrations of the camera optical lens shown. Figure 11 yes Figure 9 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 12 yes Figure 9 The diagram shows the field curvature and distortion of the camera lens. Detailed Implementation

[0016] 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.

[0017] Referring to the accompanying drawings, the technical solution of the present invention provides a camera optical lens 10, 20, 30. Figure 1 , 5Figures 10, 20, and 30 show the camera optical lenses of the present invention. Each camera optical lens includes a lens group, a prism group, and an image plane Si. Specifically, the lens group, from the object side to the image side, consists of: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and an aperture S1. The prism group guides the light propagating from the lens group through the prism group and onto the image plane Si. Optical elements such as an optical filter GF can be disposed between the prism group and the image plane Si of the image sensor.

[0018] In this invention, the prism assembly consists of two independent right-angle prisms. Utilizing the total internal reflection characteristic of the right-angle prisms, the direction of light propagation is altered, transforming the originally horizontally extending telephoto optical path into a vertically extending one, thereby significantly reducing the horizontal space occupied by the lens. Through the optical path reversal of the prism assembly, the thickness of the camera optical lenses 10, 20, and 30 can be reduced, making their structure more compact and facilitating ultra-thin design.

[0019] The first lens L1, the second lens L2, the third lens L3, and the fourth lens L4 are all made of plastic. The prism assembly is made of glass. Other materials may also be used for the individual lenses or prism assemblies.

[0020] Let the total optical length of camera lenses 10, 20, and 30 be TTL, the focal length of camera lenses 10, 20, and 30 be f, and the image height of the 1.0 field of view of camera lenses 10, 20, and 30 be IH, satisfying the following relationship: 1.30≤TTL / f≤1.40; this specifies the telephoto ratios for 10, 20, and 30mm lenses. By limiting the value to the upper limit of the conditional expression, the overall lens length can be controlled, facilitating miniaturization. On the other hand, by exceeding the lower limit of the conditional expression, distortion and on-axis chromatic aberration can be easily corrected, maintaining good optical performance.

[0021] 70.00≤43.25 f / (2 IH)≤90.00; specifies that the equivalent focal length of the camera optical lens 10, 20, and 30 to the full-frame sensor, with a magnification of about 3 times, can meet the golden focal length for shooting portraits.

[0022] The central radius of curvature of the object-side surface of the first lens L1 is defined as R1, the central radius of curvature of the image-side surface of the first lens L1 is defined as R2, and the on-axis thickness of the first lens is defined as d1, satisfying the following relationship: 8.90 ≤ (R1-R2) / d1 ≤ 12.50. Defining the surface shape of the first lens L1 helps reduce system sensitivity and also reduces stray light generated by the lens, thus improving the lens's image quality.

[0023] In this invention, the prism assembly includes a first prism L5 and a second prism L6. The first prism L5 has positive refractive power, and the second prism L6 has negative refractive power. The first prism L5 is disposed on the light-emitting side of the lens assembly. The first prism L5 guides the light propagating from the lens assembly through itself and then to the second prism L6, causing a first 90° bend in the light emitted from the lens assembly. The second prism L6 is disposed on the light-emitting side of the first prism L5. The second prism L6 guides the light propagating from the first prism L5 through itself and then to the image plane Si, causing a second 90° bend in the light emitted from the first prism L5. This achieves two 90° bends in the light, folding the optical path of the telephoto lens and enabling lens miniaturization.

[0024] The first prism L5 is a right-angle prism. Along the direction of the light path, the first prism L5 has a first incident surface Z1, a first reflecting surface Z2, and a first exit surface Z3. The first incident surface Z1 is used to receive light from the lens group, and the first reflecting surface Z2 is used to reflect light, realizing a 90° turn in the light path. The first exit surface Z3 is used to transmit the light reflected by the first reflecting surface Z2 out of the first prism L5 and guide it to the second prism L6.

[0025] After passing through the lens group, the light rays enter the first prism L5 through the first incident surface Z1 along the first optical axis T1. At least a portion of the light rays passing through the first incident surface Z1 are reflected at the first reflecting surface Z2 and exit the first prism L5 through the first exit surface Z3 along the second optical axis T2.

[0026] The second prism L6 is a right-angle prism. Along the direction of the light path, the second prism L6 has a second incident surface Z4, a second reflecting surface Z5, and a second exit surface Z6. The second incident surface Z4 is used to receive the light rays emitted from the first prism L5. The light rays are transmitted through the second incident surface Z4 into the interior of the second prism L6. The second reflecting surface Z5 is used to reflect the light rays, realizing a 90° turn in the light path. The second exit surface Z6 is used to transmit the light rays reflected by the second reflecting surface Z5 out of the second prism L6 and guide them to the image plane Si.

[0027] After passing through the first prism L5, the light rays are incident on the second prism L6 through the second incident surface Z4 along the second optical axis T2. At least a portion of the light rays passing through the second incident surface Z4 are reflected at the second reflecting surface Z5 and exit the second prism L6 through the second exit surface Z6 along the third optical axis T3 to form an image on the image plane Si.

[0028] In this invention, the extension directions of the first optical axis T1 and the third optical axis T3 are both perpendicular to the extension direction of the second optical axis T2. By folding the optical path twice at 90° angles, the horizontal space occupied by the camera optical lenses 10, 20, and 30 is significantly reduced, achieving miniaturization.

[0029] Under the above conditions, camera optical lenses 10, 20, and 30 have good optical performance while reducing thickness, and have the characteristics of large aperture, ultra-thinness, and miniaturization. They are easy to correct distortion and on-axis chromatic aberration, and are especially suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0030] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0031] The object-side surface of the first lens L1 is convex near the axis, and the image-side surface is also convex near the axis. The first lens L1 has positive refractive power. The object-side surface and image-side surface of the first lens L1 can also be configured with other concave and convex distributions.

[0032] The focal length of the first lens L1 is defined as f1, which satisfies the following relationship: 0.25≤f1 / f≤0.30. By controlling the positive optical power of the first lens L1 within a reasonable range, it is beneficial to correct the aberrations of the camera optical lenses 10, 20, and 30.

[0033] The central radius of curvature of the image side of the first lens L1 is R2, which satisfies the following relationship: 0.52≤(R1+R2) / (R1-R2)≤0.54. By reasonably controlling the shape of the first lens L1, the first lens L1 can effectively correct the spherical aberration of the system.

[0034] The on-axis thickness of the first lens L1 is d1, which satisfies the following relationship: 0.056≤d1 / TTL≤0.083. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0035] The object-side surface of the second lens L2 is concave near the axis, and the image-side surface is also concave near the axis. The second lens L2 has negative refractive power. The object-side and image-side surfaces of the second lens L2 can also be configured with other concave or convex distributions.

[0036] The focal length of the second lens L2 is defined as f2, which satisfies the following relationship: -0.38≤f2 / f≤-0.33. By controlling the negative optical power of the second lens L2 within a reasonable range, it is beneficial to correct the aberrations of the camera optical lenses 10, 20, and 30.

[0037] The center radius of curvature of the object side of the second lens L2 is R3, and the center radius of curvature of the image side of the second lens L2 is R4, satisfying the following relationship: 0.38≤(R3+R4) / (R3-R4)≤0.40, which defines the shape of the second lens L2. When within this range, as lenses develop towards ultra-thinness, it is beneficial to correct on-axis chromatic aberration.

[0038] The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.017≤d3 / TTL≤0.020. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0039] 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 third lens L3 has negative refractive power. The object-side and image-side surfaces of the third lens L3 can also be configured with other concave and convex distributions.

[0040] The focal length of the third lens L3 is defined as f3, which satisfies the following relationship: -0.34≤f3 / f≤-0.29. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0041] 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: 1.47≤(R5+R6) / (R5-R6)≤1.50. This specifies the shape of the third lens L3, which is beneficial to the shaping of the third lens L3. Within the range specified by the condition, it can mitigate the degree of light deflection after passing through the lens and effectively reduce aberrations.

[0042] The on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.017≤d5 / TTL≤0.021. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0043] The object-side surface of the fourth lens L4 is convex near the axis, and the image-side surface is also convex near the axis. The fourth lens L4 has positive refractive power. The object-side and image-side surfaces of the fourth lens L4 can also be configured with other concave and convex distributions.

[0044] The focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 0.35≤f4 / f≤0.40. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0045] The central radius of curvature of the object side of the fourth lens L4 is defined as R7, and the central radius of curvature of the image side of the fourth lens L4 is defined as R8, satisfying the following relationship: -0.16≤(R7+R8) / (R7-R8)≤-0.10. This defines the shape of the fourth lens L4. Within this range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0046] The on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.034≤d7 / TTL≤0.050. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0047] The ratio of the effective focal length to the entrance pupil diameter of the 10, 20, and 30mm camera optical lenses is FNO, which satisfies the following relationship: 2.84 ≤ FNO ≤ 2.86. This achieves a large aperture, resulting in good imaging performance for the 10, 20, and 30mm camera optical lenses.

[0048] The camera optical lenses 10, 20, and 30 satisfy the following relationship: 4.52≤TTL / IH≤5.39, which is beneficial for achieving ultra-thin design.

[0049] The following examples illustrate the camera optical lenses 10, 20, and 30 of the present invention. The symbols used in each example are shown below. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0050] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image plane Si), in mm; Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens at f / 10, f / 20, and f / 30.

[0051] 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). 1.0 Field of View (FOV): The field of view angle corresponding to the effective pixel of the sensor; Image height IHm of MIC field of view: The field of view height extended beyond 1.0 to prevent assembly deviation; FOVm: The field of view angle corresponding to the image height of the MIC field of view.

[0052] The technical solution of the present invention will be described in detail below with three embodiments.

[0053] (First Implementation) In this embodiment, the first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the first prism L5 is made of glass, and the second prism L6 is made of glass.

[0054] The object-side surface of the first lens L1 is convex at the paraxial direction, and the image-side surface is also convex at the paraxial direction; the object-side surface of the second lens L2 is concave at the paraxial direction, and the image-side surface is also concave at the paraxial direction; the object-side surface of the third lens L3 is convex at the paraxial direction, and the image-side surface is also concave at the paraxial direction; the object-side surface of the fourth lens L4 is convex at the paraxial direction, and the image-side surface is also convex at the paraxial direction.

[0055] The first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, the first prism L5 has positive refractive power, and the second prism L6 has negative refractive power.

[0056] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0057] Table 1

[0058] The meanings of each symbol are as follows.

[0059] S1: Aperture; R: Radius of curvature at the center of the optical surface; R1: The central radius of curvature of the object-side surface of the first lens L1; R2: The central radius of curvature of the image-side surface of the first lens L1; R3: The central radius of curvature of the object-side surface of the second lens L2; R4: The central radius of curvature of the image-side surface of the second lens L2; R5: The central radius of curvature of the object-side surface of the third lens L3; R6: The central radius of curvature of the image-side surface of the third lens L3; R7: The central radius of curvature of the object side surface of the fourth lens L4; R8: The central radius of curvature of the image-side surface of the fourth lens L4; R9: The central radius of curvature of the object-side surface of the first prism L5; R10: The central radius of curvature of the image side surface of the first prism L5; R11: The central radius of curvature of the object-side surface of the second prism L6; R12: The central radius of curvature of the image side surface of the second prism L6; R13: The center radius of curvature of the object side surface of the optical filter GF; R14: Radius of curvature of the center of the image side of the optical filter GF; d: Axial thickness of the lens, axial distance between lenses; d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1; d1: On-axis thickness of the first lens L1; 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; d3: On-axis thickness of the second lens L2; d4: The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3; d5: On-axis thickness of the third lens L3; 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; d7: On-axis thickness of the fourth lens L4; d8: The on-axis distance from the image-side surface of the fourth lens L4 to the object-side surface of the first prism L5; d9: On-axis thickness of the first prism L5; d10: The on-axis distance from the image-side surface of the first prism L5 to the object-side surface of the second prism L6; d11: On-axis thickness of the second prism L6; d12: The on-axis distance from the image-side surface of the second prism L6 to the object-side surface of the optical filter GF; d13: On-axis thickness of the optical filter GF; d14: The axial distance from the image-side surface of the optical filter GF to the image plane Si; nd: Refractive index of the d-line (wavelength of the d-line is 587.56 nm); nd1: The refractive index of the d-line of the first lens L1; nd2: The refractive index of the d-line of the second lens L2; nd3: The refractive index of the d-line of the third lens L3; nd4: The refractive index of the d-line of the fourth lens L4; nd5: The refractive index of the d-line of the first prism L5; nd6: The refractive index of the d-line of the second prism L6; ndg: The refractive index of the d-line of the optical filter GF; vd: Abbe number; v1: Abbe number of the first lens L1; v2: Abbe number of the second lens L2; v3: Abbe number of the third lens L3; v4: Abbe number of the fourth lens L4; v5: Abbe number of the first prism L5; v6: Abbe number of the second prism L6; vg: Abbe number of the optical filter GF.

[0060] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0061] Table 2

[0062] 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).

[0063] z=(cr 2 ) / {1+[1-(k+1)(c 2 r2 )] 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) 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).

[0064] Figure 2 , Figure 3 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm passes through the camera optical lens 10 of the first embodiment. Figure 4 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 555nm passes 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.

[0065] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 4.294 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 29.90°, the image height IHm of the MIC field of view is 3.537 mm, and the field of view FOVm of the MIC field of view is 32.15°. The camera optical lens 10 meets the design requirements of large aperture, miniaturization, and ultra-thinness. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0066] (Second Implementation) The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0067] Figure 5 The image shown is the camera optical lens 20 according to the second embodiment of the present invention.

[0068] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0069] Table 3

[0070] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0071] Table 4

[0072] Figure 6 , Figure 7 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm passes through the camera optical lens 20 of the second embodiment. Figure 8 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 555nm passes 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.

[0073] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 3.892mm, the image height IH of the 1.0 field of view is 3.420mm, the field of view FOV of the 1.0 field of view is 34.48°, the image height IHm of the MIC field of view is 3.500mm, and the field of view FOVm of the MIC field of view is 35.27°. The camera optical lens 20 meets the design requirements of large aperture, miniaturization, and ultra-thinness. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0074] (Third implementation method) The symbols in the third embodiment have the same meanings as those in the first embodiment.

[0075] Figure 9 The image shown is the camera optical lens 30 according to the third embodiment of the present invention.

[0076] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0077] Table 5

[0078] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0079] Table 6

[0080] Figure 10 , Figure 11 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 555nm, 510nm and 470nm passes through the camera optical lens 30 of the third embodiment. Figure 12 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 555nm passes 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.

[0081] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 4.381 mm, the image height IH of the 1.0 field of view is 3.020 mm, the field of view FOV of the 1.0 field of view is 27.42°, the image height IHm of the MIC field of view is 3.120 mm, and the field of view FOVm of the MIC field of view is 28.31°. The camera optical lens 30 meets the design requirements of large aperture, miniaturization, and ultra-thinness. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0082] Table 7 shows the values ​​corresponding to various numerical values ​​and parameters specified in the conditional expressions for each of the three implementation methods.

[0083] Table 7

[0084] 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, From the object side to the image side, the system comprises a lens group, a prism group, and an image plane. The lens group consists of four lenses, which, from the object side to the image side, are in the following order: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, and a fourth lens with positive refractive power. The prism group is used to guide light propagating from the lens group through the prism group and onto the image plane. Wherein, the total optical length of the camera optical lens is TTL, the focal length of the camera optical lens is f, the image height of the camera optical lens in a 1.0 field of view is IH, and the following relationship is satisfied: 1.30≤TTL / f≤1.40; 70.00≤43.25 f / (2 IH)≤90.00。 2. The camera optical lens according to claim 1, characterized in that, 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, and the axial thickness of the first lens is d1, satisfying the following relationship: 8.90≤(R1-R2) / d1≤12.

50.

3. The camera optical lens according to claim 1, characterized in that, The prism assembly includes a first prism and a second prism, wherein the first prism has a positive refractive force and the second prism has a negative refractive force. The first prism has a first incident surface, a first reflecting surface and a first exit surface in sequence along the optical path. After passing through the lens group, the light rays enter the first prism through the first incident surface along the first optical axis. At least a portion of the light rays passing through the first incident surface are reflected at the first reflecting surface and exit the first prism through the first exit surface along the second optical axis. The second prism has a second incident surface, a second reflecting surface and a second exiting surface in sequence along the optical path. After passing through the first prism, the light rays enter the second prism through the second incident surface along the second optical axis. At least a portion of the light rays passing through the second incident surface are reflected at the second reflecting surface and exit the second prism through the second exiting surface along the third optical axis to form an image on the image plane. The extension direction of the first optical axis and the extension direction of the third optical axis are both perpendicular to the extension direction of the second optical axis.

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 focal length of the first lens is f1, the central radius of curvature of the object side of the first lens is R1, the central radius of curvature of the image side of the first lens is R2, and the axial thickness of the first lens is d1, and the following relationship is satisfied: 0.25≤f1 / f≤0.30; 0.52≤(R1+R2) / (R1-R2)≤0.54; 0.056≤d1 / TTL≤0.

083.

5. The camera optical lens according to claim 1, characterized in that, The object-side surface of the second lens is concave at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position. 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: -0.38≤f² / f≤-0.33; 0.38≤(R3+R4) / (R3-R4)≤0.40; 0.017≤d3 / TTL≤0.

020.

6. The camera optical lens according to claim 1, characterized in that, The object-side surface of the third lens is convex at the paraxial position, and the image-side surface of the third lens is concave at the paraxial position. The focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, the central radius of curvature of the image side of the third lens is R6, and the axial thickness of the third lens is d5, and the following relationship is satisfied: -0.34≤f3 / f≤-0.29; 1.47≤(R5+R6) / (R5-R6)≤1.50; 0.017≤d5 / TTL≤0.

021.

7. The camera optical lens according to claim 1, characterized in that, The image-side surface of the fourth lens is convex at the paraxial position. The fourth lens has a focal length of f4, a central radius of curvature of the object side of the fourth lens of R7, a central radius of curvature of the image side of the fourth lens of R8, and an axial thickness of d7, and satisfies the following relationship: 0.35≤f4 / f≤0.40; -0.16≤(R7+R8) / (R7-R8)≤-0.10; 0.034≤d7 / TTL≤0.

050.

8. The camera optical lens according to claim 1, characterized in that, The ratio of the effective focal length to the entrance pupil diameter of the camera optical lens is FNO, and satisfies the following relationship: 2.84≤FNO≤2.

86.

9. The camera optical lens according to claim 1, characterized in that, 4.52≤TTL / IH≤5.

39.

10. The camera optical lens according to claim 1, characterized in that, The first lens, the second lens, the third lens, and the fourth lens are all made of plastic, and the prism assembly is made of glass.

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