Camera optical lens

Abstract

This invention relates to the field of optical lenses and discloses a camera optical lens, comprising a lens group, a prism, and an image plane. The lens group comprises five lenses, which are arranged sequentially 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, a fourth lens with positive refractive power, and a fifth lens with negative refractive power. The prism is disposed between the fourth and fifth lenses in the light propagation path. The fifth lens and the image plane can move towards or away from the prism, allowing the camera optical lens to switch between a first focusing state and a second focusing state; and satisfying the following relationships: 1.40≤TTLa / fa≤1.56; -1.10≤f3 / f4≤-0.80; 4.00≤(R14+R15) / (R14-R15)≤25.00.

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 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 long focal length and miniaturization.

[0004] To achieve the above objectives, the present invention provides a camera optical lens, comprising a lens group, a prism, and an image plane. The lens group comprises five lenses, which are arranged sequentially 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, a fourth lens with positive refractive power, and a fifth lens with negative refractive power. The prism is disposed between the fourth lens and the fifth lens in the light propagation path. The prism has an incident surface, at least one reflecting surface, and an exit surface along the light path. Light rays emitted from the fourth lens pass through the incident surface and enter the prism. After undergoing at least one reflection within the prism through the at least one reflecting surface, the light rays exit from the exit surface and enter the fifth lens, and then exit from the fifth lens to the image plane to form an image. The fifth lens and the image plane can be moved towards or away from the prism, allowing the camera optical lens to switch between a first focusing state and a second focusing state. Wherein, the total optical length of the camera optical lens in the first focusing state is TTLa, the focal length of the camera optical lens in the first focusing state is fa, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the fifth lens is R14, and the central radius of curvature of the image side of the fifth lens is R15, and the following relationship is satisfied: 1.40≤TTLa / fa≤1.56; -1.10≤f3 / f4≤-0.80; 4.00≤(R14+R15) / (R14-R15)≤25.00.

[0005] Preferably, the axial distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, the axial thickness of the third lens is d5, and the following relationship is satisfied: 2.50≤d4 / d5≤7.50.

[0006] 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: 0.76≤f1 / fa≤1.02; 0.28≤(R1+R2) / (R1-R2)≤0.88; 0.035≤d1 / TTLa≤0.049.

[0007] Preferably, the object-side surface of the second lens is convex 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: -6.75≤f² / fa≤-5.02; 14.19≤(R3+R4) / (R3-R4)≤16.74; 0.025≤d3 / TTLa≤0.031.

[0008] Preferably, the object-side surface of the third lens is concave near the axis, and the image-side surface of the third lens is convex near the axis. The central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, and the axial thickness of the third lens is d5, and the following relationship is satisfied: -0.81≤f3 / fa≤-0.72; -5.16≤(R5+R6) / (R5-R6)≤-4.52; 0.010≤d5 / TTLa≤0.024.

[0009] Preferably, the object-side surface of the fourth lens is concave near the axis, and the image-side surface of the fourth lens is convex near the axis. 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 the following relationship is satisfied: 0.73≤f4 / fa≤0.92; 1.56≤(R7+R8) / (R7-R8)≤1.68; 0.025≤d7 / TTLa≤0.037.

[0010] Preferably, the object-side surface of the fifth lens is convex at the paraxial position, and the image-side surface of the fifth lens is concave at the paraxial position. The fifth lens has a focal length of f6 and an on-axis thickness of d14, and satisfies the following relationship: -12.37≤f6 / fa≤-0.54; 0.016≤d14 / TTLa≤0.020.

[0011] Preferably, the reflecting surface includes a first reflecting surface, a second reflecting surface, and a third reflecting surface in sequence along the optical path, and the incident surface, the second reflecting surface, and the exiting surface are on the same plane.

[0012] Preferably, the image height of the 1.0 field of view of the camera optical lens is IH, and satisfies the following relationship: 5.501≤TTLa / IH≤5.583.

[0013] The beneficial effects of the present invention are as follows: The camera optical lens according to the present invention has excellent optical characteristics. The overall lens module structure maintains a constant length during focusing, thus being more compact and stable. It can achieve faster and more accurate focusing. Furthermore, by rationally allocating the optical focal length of the system, the system has better imaging quality and lower sensitivity. It can reduce thickness and maintain performance while compressing the overall length of the system. It has the characteristics of long focal length and miniaturization. It 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

[0014] 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 in the first focusing state 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 camera optical lens in the second focusing state according to the first 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 camera optical lens in the first focusing state according to the second 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 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 13 This is a schematic diagram of the structure of the camera optical lens in the second focusing state according to the second embodiment of the present invention; Figure 14 yes Figure 13 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 15 yes Figure 13 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 16 yes Figure 13 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 17 This is a schematic diagram of the camera optical lens in the first focusing state according to the third embodiment of the present invention; Figure 18 yes Figure 17 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 19 yes Figure 17 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 20 yes Figure 17 A schematic diagram of field curvature and distortion of the camera optical lens shown; Figure 21 This is a schematic diagram of the camera optical lens in the second focusing state according to the third embodiment of the present invention; Figure 22 yes Figure 21 A schematic diagram of axial aberrations of the camera optical lens shown; Figure 23 yes Figure 21 A schematic diagram of chromatic aberration at magnification for a camera lens; Figure 24 yes Figure 21 The diagram shows the field curvature and distortion of the camera lens. Detailed Implementation

[0015] 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.

[0016] Referring to the accompanying drawings, the technical solution of the present invention provides a camera optical lens 10, 20, 30. Figure 1 , 5 Figures 9, 13, 17, and 21 show the camera optical lenses 10, 20, and 30 of the present invention. These lenses include a lens group, a prism L5, and an image plane Si. The lens group comprises five lenses. Specifically, the five lenses, from the object side to the image side, are as follows: a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with negative refractive power, an aperture S1, a fourth lens L4 with positive refractive power, and a fifth lens L6 with negative refractive power. An optical filter GF or other optical element may be disposed between the fifth lens L6 and the image plane Si.

[0017] Prism L5 is positioned between the fourth lens L4 and the fifth lens L6 along the light propagation path. Prism L5 sequentially has an incident surface T1, at least one reflecting surface, and an exit surface T2 along the light path. Light rays exiting from the fourth lens L4 pass through the incident surface T1 and enter prism L5. After undergoing at least one reflection within the prism via at least one reflecting surface, they exit from the exit surface T2 and reach the fifth lens L6, then exit from the fifth lens L6 to the image plane Si for imaging. The fifth lens L6 and the image plane Si can move towards or away from prism L5, allowing the camera lenses 10, 20, and 30 to switch between a first focusing state and a second focusing state. This ensures that the overall lens module structure maintains a constant length during focusing, making the camera lenses 10, 20, and 30 more compact and stable, enabling faster and more accurate focusing.

[0018] Define the total optical length of the camera lenses 10, 20, and 30 in the first focusing state as TTLa, the focal length of the camera lenses 10, 20, and 30 in the first focusing state as fa, the focal length of the third lens L3 as f3, the focal length of the fourth lens L4 as f4, the central radius of curvature of the object side of the fifth lens L6 as R14, and the central radius of curvature of the image side of the fifth lens L6 as R15, and satisfy the following relationship: 1.40≤TTLa / fa≤1.56; This constrains the ratio of the total optical length to the focal length, defining the telephoto ratio. By limiting the value to the upper limit of the condition, the total optical length can be controlled to be shorter, facilitating miniaturization. On the other hand, by limiting the value to the lower limit of the condition, distortion and on-axis chromatic aberration can be easily corrected, maintaining good optical performance.

[0019] -1.10≤f3 / f4≤-0.80; This constrains the ratio of the focal length of the third lens L3 to the focal length of the fourth lens L4, resulting in better imaging quality and lower sensitivity for the system.

[0020] 4.00≤(R14+R15) / (R14-R15)≤25.00; The shape of the fifth lens L6 is specified, which is beneficial to correct the astigmatism and distortion of the camera optical lenses 10, 20, and 30, so that the distortion|Distortion|≤5% and the possibility of vignetting is reduced.

[0021] Under the above conditions, the camera optical lenses 10, 20, and 30 have good optical performance, while the overall lens module structure maintains the same length during focusing, thus becoming more compact and stable. This allows for faster and more accurate focusing, better image quality, and lower sensitivity. The thickness can be reduced, and performance can be guaranteed while compressing the overall system length. They have the characteristics of long focal length and miniaturization, and are easy to correct for distortion and on-axis chromatic aberration. They are especially suitable for mobile phone camera lens assemblies and web camera lenses composed of high-pixel CCD, CMOS, and other camera elements.

[0022] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0023] The axial distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3 is d4, and the axial thickness of the third lens L3 is d5, satisfying the following relationship: 2.50 ≤ d4 / d5 ≤ 7.50. Within this condition range, it helps to compress the overall length of the optical system.

[0024] 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 object-side surface and image-side surface of the first lens L1 can also be configured with other concave and convex distributions.

[0025] The focal length of the first lens L1 is f1, satisfying 0.76 ≤ f1 / fa ≤ 1.02. The ratio of the positive refractive power of the first lens L1 to the overall focal length is specified. Within this specified range, the first lens possesses appropriate positive refractive power, which is beneficial for reducing system aberrations and also facilitates the miniaturization and telephoto extension of lenses.

[0026] The center radius of curvature of the object side of the first lens L1 is R1, and the center radius of curvature of the image side of the first lens L1 is R2. The value is limited to 0.28≤(R1+R2) / (R1-R2)≤0.88. The shape of the first lens L1 is reasonably controlled so that the first lens L1 can effectively correct the spherical aberration of the system.

[0027] The on-axis thickness of the first lens L1 is d1, which satisfies the following relationship: 0.035≤d1 / TTLa≤0.049. Within the range of the condition, it is beneficial to achieve miniaturization.

[0028] The object-side surface of the second lens L2 is convex near the axis, and the image-side surface is concave near the axis. The object-side and image-side surfaces of the second lens L2 can also be configured with other concave and convex distributions.

[0029] The focal length of the second lens L2 is f2, and the limit is -6.75≤f2 / fa≤-5.02. 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.

[0030] 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: 14.19≤(R3+R4) / (R3-R4)≤16.74, which defines the shape of the second lens L2. When within this range, as lenses develop towards smaller and longer focal lengths, it is beneficial for correcting on-axis chromatic aberration.

[0031] The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.025≤d3 / TTLa≤0.031. Within the range of the condition, it is beneficial to achieve miniaturization.

[0032] The object-side surface of the third lens L3 is concave near the axis, and the image-side surface is convex 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.

[0033] By limiting -0.81 ≤ f3 / fa ≤ -0.72 and rationally allocating the optical power, the system achieves better imaging quality and lower sensitivity.

[0034] 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: -5.16≤(R5+R6) / (R5-R6)≤-4.52, which 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.

[0035] The constraint 0.010≤d5 / TTLa≤0.024, within the conditional range, is beneficial for miniaturization.

[0036] The object-side surface of the fourth lens L4 is concave near the axis, while the image-side surface is convex near the axis. The object-side and image-side surfaces of the fourth lens L4 can also be configured with other concave / convex distributions.

[0037] By limiting the optical power to 0.73≤f4 / fa≤0.92 and rationally allocating the optical power, the system achieves better imaging quality and lower sensitivity.

[0038] 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. The shape of the fourth lens L4 is defined by the condition 1.56≤(R7+R8) / (R7-R8)≤1.68. Within this range, with the development of miniaturization and long focal lengths, it is beneficial to correct aberrations and other problems at off-axis drawing angles.

[0039] The on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.025≤d7 / TTLa≤0.037. Within the range of the condition, it is beneficial to achieve miniaturization.

[0040] The object-side surface of the fifth lens L6 is convex near the axis, while the image-side surface is concave near the axis. The object-side and image-side surfaces of the fifth lens L6 can also be configured with other concave / convex distributions.

[0041] The focal length of the fifth lens L6 is f6, which satisfies the following relationship: -12.37≤f6 / fa≤-0.54. The limitation of the fifth lens L6 can effectively make the light angles of the camera optical lenses 10, 20, and 30 smoother and reduce tolerance sensitivity.

[0042] The on-axis thickness of the fifth lens L6 is d14, which satisfies the following relationship: 0.016≤d14 / TTLa≤0.020. Within the range of the condition, it is beneficial to achieve miniaturization.

[0043] Prism L5 has reflective properties, as shown in the reference. Figure 1 As shown, along the optical axis, prism L5 sequentially includes: an incident surface T1, a first reflecting surface B1, a second reflecting surface B2, a third reflecting surface B3, and an exit surface T2, wherein the incident surface T1, the second reflecting surface B2, and the exit surface T2 are essentially the same plane. 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. The first optical axis I1 intersects with the second optical axis I2 at the first reflecting surface B1, the second optical axis I2 intersects with the third optical axis I3 at the second reflecting surface B2, and the third optical axis I3 intersects with the fourth optical axis I4 at the third reflecting surface B3; wherein the first optical axis I1 and the fourth optical axis I4 are parallel, and the directions of the first optical axis I1 and the fourth optical axis I4 are opposite.

[0044] When the principal ray of the 0 field of view enters the camera optical lenses 10, 20, and 30 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 enters the prism L5 through the incident surface T1. After being reflected by the first reflecting surface B1, the ray travels along the second optical axis I2. After being reflected by the second reflecting surface B2, the ray travels along the third optical axis I3. After being reflected by the third reflecting surface B3, the ray travels along the fourth optical axis I4. During its journey along the fourth optical axis I4, the ray exits from the exit surface T2 to the fifth lens L6, and passes through the fifth lens L6 and the optical filter GF in sequence to reach the image plane Si.

[0045] 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 fifth lens L6 is made of plastic, and the prism L5 is made of glass. Other materials may also be used for the lenses.

[0046] The image height of the 1.0 field of view of the camera optical lenses 10, 20, and 30 is IH, and satisfies the following relationship: 5.501≤TTLa / IH≤5.583, which is beneficial for miniaturization.

[0047] In this invention, the camera optical lenses 10, 20, and 30 can form a first focusing state and a second focusing state, enabling the subject to be successfully focused and imaged with good image quality when it is moved from infinity to within 200mm in front of the camera optical lenses 10, 20, and 30. The first focusing state is when the object distance is infinity, and the second focusing state is when the object distance is 200mm.

[0048] 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.

[0049] TTLa: Total optical length of camera lenses 10, 20, and 30 in the first focusing state (axial distance from the object side surface of the first lens L1 to the image plane Si), in mm; TTLb: Total optical length of camera lenses 10, 20, and 30 in the second focusing state (axial distance from the object side surface of the first lens L1 to the image surface Si), in mm; Aperture value FNOa: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens in its first focusing state for apertures of 10, 20, and 30mm.

[0050] Aperture value FNOb: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens in the second focusing state for apertures of 10, 20, and 30mm.

[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).

[0052] 1.0 Field of view (FOVa): The field of view corresponding to the effective pixels of the sensor in the first focusing state of the camera optical lens 10, 20, 30.

[0053] 1.0 Field of view (FOVb): The field of view corresponding to the effective pixels of the sensor in the second focusing state of the camera optical lenses 10, 20, and 30.

[0054] Image height IHm of MIC field of view: The field of view height extended beyond 1.0 to prevent assembly deviations.

[0055] FOVm: The field of view angle corresponding to the image height of the MIC field of view.

[0056] ENPDa: The entrance pupil diameter of a camera lens in its first focusing state (10, 20, 30mm).

[0057] ENPDb: Entrance pupil diameter of camera optical lenses 10, 20, and 30 in the second focusing state.

[0058] The technical solution of the present invention will be described in detail below with three embodiments.

[0059] (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 fifth lens L6 is made of plastic, and the prism L5 is made of glass.

[0060] 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 convex at the paraxial direction, and the image-side surface is concave at the paraxial direction; the object-side surface of the third lens L3 is concave at the paraxial direction, and the image-side surface is convex at the paraxial direction; the object-side surface of the fourth lens L4 is concave at the paraxial direction, and the image-side surface is convex at the paraxial direction; the object-side surface of the fifth lens L6 is convex at the paraxial direction, and the image-side surface is concave at the paraxial direction.

[0061] 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, and the fifth lens L6 has negative refractive power.

[0062] Tables 1, 2, and 3 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0063] Table 1

[0064] Table 2 shows the relevant optical parameters of the camera lens 10 in the first focusing state and the second focusing state in Embodiment 1.

[0065] Table 2

[0066] The meanings of each symbol are as follows.

[0067] 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 radius of curvature of the center of the incident surface T1 of prism L5; R10: The radius of curvature of the center of the first reflecting surface B1 of prism L5; R11: The central radius of curvature of the second reflecting surface B2 of prism L5; R12: The central radius of curvature of the third reflecting surface B3 of prism L5; R13: The central radius of curvature of the exit surface T2 of prism L5; R14: The central radius of curvature of the object-side surface of the fifth lens L6; R15: The central radius of curvature of the image-side surface of the fifth lens L6; R16: The center radius of curvature of the object side surface of the optical filter GF; R17: 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 incident surface T1 of the prism L5; d9: The on-axis distance of the principal ray of the field of view from the incident surface T1 of prism L5 to the first reflecting surface B1 of prism L5. d10: The on-axis distance of the principal ray of the field of view from the first reflecting surface B1 of prism L5 to the second reflecting surface B2 of prism L5; d11: The on-axis distance of the principal ray of the field of view from the second reflecting surface B2 of prism L5 to the third reflecting surface B3 of prism L5; d12: The on-axis distance of the principal ray of the field of view from the third reflecting surface B3 of prism L5 to the exiting surface T2 of prism L5. d13: The on-axis distance from the exit surface T2 of prism L5 to the fifth lens L6; d14: On-axis thickness of the fifth lens L6; d15: The on-axis distance from the image-side surface of the fifth lens L6 to the object-side surface of the optical filter GF; d16: On-axis thickness of the optical filter GF; d17: 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 prism L5; nd6: The refractive index of the d-line of the fifth lens 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 prism L5; v6: Abbe number of the fifth lens L6; vg: Abbe number of the optical filter GF.

[0068] Table 3 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0069] Table 3

[0070] 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).

[0071] 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 +A18r18 +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).

[0072] Figure 1 This is a schematic diagram of the camera optical lens 10 in the first focusing state according to the first embodiment of the present invention. Figure 5 This is a schematic diagram of the camera optical lens 10 in the second focusing state according to the first embodiment of the present invention. Figure 2 , Figure 3 The diagrams show axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 435nm after passing through the camera lens 10 of the first embodiment in the first focusing state. Figure 6 , Figure 7 The diagrams show axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm and 435nm after passing through the camera optical lens 10 of the first embodiment in the second focusing state. Figure 4 This shows a schematic diagram of field curvature and distortion of light with a wavelength of 546nm after passing through the camera optical lens 10 of the first embodiment in the first focusing state. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. Figure 8 This shows a schematic diagram of field curvature and distortion of light with a wavelength of 546nm after passing through the camera optical lens 10 of the first embodiment in the second focusing state. 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, in the first focusing state, i.e., at infinity object distance, the entrance pupil diameter ENPDa of the imaging optical lens 10 is 3.898mm, the image height IH of the 1.0 field of view is 3.277mm, the field of view FOVa of the 1.0 field of view is 29.69°, the image height IHm of the MIC field of view is 3.575mm, and the field of view FOVm of the MIC field of view is 32.21°. The imaging optical lens 10 meets the design requirements of miniaturization and long focal length, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0074] (Second Implementation) The symbols in the second embodiment have the same meanings as those in the first embodiment.

[0075] Figure 9 This is a schematic diagram of the camera optical lens 20 in the first focusing state according to the second embodiment of the present invention. Figure 13 This is a schematic diagram of the structure of the camera optical lens 20 in the second focusing state according to the second embodiment of the present invention.

[0076] Tables 4, 5, and 6 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0077] Table 4

[0078] Table 5 shows the relevant optical parameters of the camera lens 20 in the first focusing state and the second focusing state in Embodiment 2.

[0079] Table 5

[0080] Table 6 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0081] Table 6

[0082] Figure 10 , Figure 11 The diagrams show the axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 435nm after passing through the camera lens 20 of the second embodiment in the first focusing state. Figure 14 , Figure 15 The diagrams show the axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm and 435nm after passing through the camera optical lens 20 of the second embodiment in the second focusing state. Figure 12This shows a schematic diagram of field curvature and distortion of light with a wavelength of 546nm after passing through the camera optical lens 20 of the second embodiment in the first focusing state. Figure 12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. Figure 16 This shows a schematic diagram of field curvature and distortion of light with a wavelength of 546nm after passing through the camera optical lens 20 of the second embodiment in the second focusing state. Figure 16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0083] In this embodiment, in the first focusing state, i.e., at infinity object distance, the entrance pupil diameter ENPDa of the imaging optical lens 20 is 4.064 mm, the image height IH of the 1.0 field of view is 3.277 mm, the field of view FOVa of the 1.0 field of view is 29.68°, the image height IHm of the MIC field of view is 3.420 mm, and the field of view FOVm of the MIC field of view is 30.86°. The imaging optical lens 20 meets the design requirements of miniaturization and long focal length, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0084] (Third implementation method) The symbols in the third embodiment have the same meanings as those in the first embodiment.

[0085] Figure 17 This is a schematic diagram of the camera optical lens 30 in the first focusing state according to the third embodiment of the present invention. Figure 21 This is a schematic diagram of the camera optical lens 30 in the second focusing state according to the third embodiment of the present invention.

[0086] Tables 7, 8, and 9 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0087] Table 7

[0088] Table 8 shows the relevant optical parameters of the camera lens 30 in the first focusing state and the second focusing state in Embodiment 3.

[0089] Table 8

[0090] Table 9 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0091] Table 9

[0092] Figure 18 , Figure 19The diagrams show the axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm, and 435nm after passing through the camera lens 30 of the third embodiment in the first focusing state. Figure 22 , Figure 23 The diagrams show the axial aberration and magnification chromatic aberration of light with wavelengths of 656nm, 587nm, 546nm, 486nm and 435nm after passing through the camera optical lens 30 of the third embodiment in the second focusing state. Figure 20 This shows a schematic diagram of field curvature and distortion of light with a wavelength of 546nm after passing through the camera optical lens 30 of the third embodiment in the first focusing state. Figure 20 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. Figure 24 This shows a schematic diagram of field curvature and distortion of light with a wavelength of 546nm after passing through the camera optical lens 30 of the third embodiment in the second focusing state. Figure 24 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0093] In this embodiment, in the first focusing state, i.e., at infinity object distance, the entrance pupil diameter ENPDa of the imaging optical lens 30 is 3.747mm, the image height IH of the 1.0 field of view is 3.277mm, the field of view FOVa of the 1.0 field of view is 30.02°, the image height IHm of the MIC field of view is 3.575mm, and the field of view FOVm of the MIC field of view is 32.41°. The imaging optical lens 30 meets the design requirements of miniaturization and long focal length, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0094] Table 10 shows the values ​​corresponding to various numerical values ​​and parameters specified in the conditional expressions in each of the three implementation methods.

[0095] Table 10

[0096] 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 system includes a lens group, a prism, and an image plane. The lens group comprises five lenses, which are arranged sequentially 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, a fourth lens with positive refractive power, and a fifth lens with negative refractive power. The prism is positioned between the fourth lens and the fifth lens along the light propagation path. The prism has an incident surface, at least one reflecting surface, and an exit surface along the light path. Light rays emitted from the fourth lens pass through the incident surface and enter the prism. After undergoing at least one reflection within the prism via the at least one reflecting surface, the light rays exit from the exit surface and reach the fifth lens, and then exit from the fifth lens to the image plane to form an image. The fifth lens and the image plane can be moved towards or away from the prism, allowing the camera optical lens to switch between a first focusing state and a second focusing state. Wherein, the total optical length of the camera optical lens in the first focusing state is TTLa, the focal length of the camera optical lens in the first focusing state is fa, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the fifth lens is R14, and the central radius of curvature of the image side of the fifth lens is R15, and the following relationship is satisfied: 1.40≤TTLa / fa≤1.56; -1.10≤f3 / f4≤-0.80; 4.00≤(R14+R15) / (R14-R15)≤25.

00.

2. The camera optical lens according to claim 1, characterized in that, The axial distance from the image-side surface of the second lens to the object-side surface of the third lens is d4, and the axial thickness of the third lens is d5, satisfying the following relationship: 2.50≤d4 / d5≤7.

50.

3. 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: 0.76≤f1 / fa≤1.02; 0.28≤(R1+R2) / (R1-R2)≤0.88; 0.035≤d1 / TTLa≤0.

049.

4. The camera optical lens according to claim 1, characterized in that, The object-side surface of the second lens is convex 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: -6.75≤f² / fa≤-5.02; 14.19≤(R3+R4) / (R3-R4)≤16.74; 0.025≤d3 / TTLa≤0.

031.

5. The camera optical lens according to claim 1, characterized in that, The object-side surface of the third lens is concave near the axis, and the image-side surface of the third lens is convex near the axis. The central radius of curvature of the object-side surface of the third lens is R5, the central radius of curvature of the image-side surface of the third lens is R6, and the axial thickness of the third lens is d5, and the following relationship is satisfied: -0.81≤f3 / fa≤-0.72; -5.16≤(R5+R6) / (R5-R6)≤-4.52; 0.010≤d5 / TTLa≤0.

024.

6. The camera optical lens according to claim 1, characterized in that, The object-side surface of the fourth lens is concave near the axis, and the image-side surface of the fourth lens is convex near the axis. 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 the following relationship is satisfied: 0.73≤f4 / fa≤0.92; 1.56≤(R7+R8) / (R7-R8)≤1.68; 0.025≤d7 / TTLa≤0.

037.

7. The camera optical lens according to claim 1, characterized in that, The object-side surface of the fifth lens is convex at the paraxial position, and the image-side surface of the fifth lens is concave at the paraxial position. The fifth lens has a focal length of f6 and an on-axis thickness of d14, and satisfies the following relationship: -12.37≤f6 / fa≤-0.54; 0.016≤d14 / TTLa≤0.

020.

8. The camera optical lens according to claim 1, characterized in that, The reflective surface includes a first reflective surface, a second reflective surface, and a third reflective surface in sequence along the optical path, and the incident surface, the second reflective surface, and the exit surface are on the same plane.

9. The camera optical lens according to claim 1, characterized in that, The image height of the 1.0 field of view of the camera optical lens is IH, and satisfies the following relationship: 5.501≤TTLa / IH≤5.583.

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