Camera lens

Abstract

This invention relates to the field of optical lenses and discloses a camera optical lens. The camera optical lens includes a lens group and a prism group. The lens group comprises four 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 positive refractive power, a third lens with negative refractive power, and a fourth lens with negative refractive power. The prism group is disposed between the lens group and the image sensor in the light propagation path. The thickness of the camera optical lens is TZ, and the total optical length of the camera optical lens is TTL, satisfying the following relationship: 0.25≤TZ / TTL≤0.40.

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, also meets the design requirements of a large aperture and ultra-thin design.

[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 arranged sequentially from the object side to the image side as follows: a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a fourth lens with negative refractive power. The prism group is disposed between the lens group and the image plane in the light propagation path. The prism group has an incident surface, multiple reflecting surfaces, and an exit surface sequentially along the light path. Light rays emitted from the lens group pass through the incident surface and enter the prism group. After undergoing multiple reflections within the prism group through the multiple reflecting surfaces, the light rays exit from the exit surface and are projected onto the image plane to form an image. Wherein, the thickness of the camera optical lens is TZ, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.25≤TZ / TTL≤0.40.

[0005] Preferably, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and they satisfy the following relationship: 0.70≤f3 / f4≤1.30.

[0006] Preferably, the elevation at the maximum effective optical diameter of the first lens object side is SAG11, the central radius of curvature of the first lens object side is R1, and the following relationship is satisfied: 0.18≤SAG11 / R1≤0.30.

[0007] Preferably, the plurality of reflecting surfaces along the optical path include, in sequence, a first reflecting surface, a second reflecting surface, a third reflecting surface, a fourth reflecting surface, and a fifth reflecting surface; After passing through the lens group, the light rays enter the prism group through the incident surface along the first optical axis. At least a portion of the light rays passing through the incident surface are reflected at the first reflecting surface and propagate along the second optical axis. At least a portion of the light rays reflected from the first reflecting surface are incident on the second reflecting surface, and after being reflected at the second reflecting surface, they propagate along the third optical axis. At least a portion of the light rays reflected from the second reflecting surface are incident on the third reflecting surface, and after being reflected at the third reflecting surface, they propagate along the fourth optical axis. At least a portion of the light rays reflected from the third reflecting surface are incident on the fourth reflecting surface, and after being reflected at the fourth reflecting surface, they propagate along the fifth optical axis. At least a portion of the light rays reflected from the fourth reflecting surface are incident on the fifth reflecting surface, and after being reflected at the fifth reflecting surface, they exit the prism assembly along the sixth optical axis through the exiting surface. The incident surface, the second reflecting surface, the fourth reflecting surface, and the exiting surface are located on the same plane, and the incident surface, the second reflecting surface, the fourth reflecting surface, and the exiting surface are all arranged parallel to the third reflecting surface. The angle between the first reflecting surface and the incident surface is equal to the angle between the fourth reflecting surface and the exiting surface. Wherein, the angle between the incident surface and the first reflecting surface is θ, and satisfies the following relationship: 25.00≤θ≤35.00.

[0008] Preferably, the object-side surface of the first lens is convex at the paraxial position; The focal length of the camera optical lens is f, 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 they satisfy the following relationship: 0.33≤f1 / f≤0.38; -1.26≤(R1+R2) / (R1-R2)≤-0.92; 0.058≤d1 / TTL≤0.065.

[0009] 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 camera optical lens is f, 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 on-axis thickness of the second lens is d3, and they satisfy the following relationship: 1.03≤f² / f≤1.17; -1.18≤(R3+R4) / (R3-R4)≤-1.02; 0.020≤d3 / TTL≤0.026.

[0010] 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 camera optical lens is f, 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: -0.58≤f3 / f≤-0.47; 1.64≤(R5+R6) / (R5-R6)≤2.33; 0.013≤d5 / TTL≤0.017.

[0011] Preferably, the image-side surface of the fourth lens is concave at the paraxial position; The focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the fourth lens is R7, and the central radius of curvature of the image side of the fourth lens is R8, and the following relationship is satisfied: -0.68≤f4 / f≤-0.44; 0.85≤(R7+R8) / (R7-R8)≤1.23; 0.005≤d7 / TTL≤0.016.

[0012] Preferably, the aperture value of the camera optical lens is Fno, and satisfies the following relationship: 3.25≤Fno≤3.27.

[0013] Preferably, the first lens 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, and has the characteristics of large aperture and ultra-thinness, 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

[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 , 5 Figures 1 and 9 show the camera optical lenses 10, 20, and 30 of the present invention, which together comprise four lenses. Specifically, the camera optical lenses include a lens group, a prism group L5, and an image plane Si. The lens group, from the object side to the image side, consists of: a first lens L1, an aperture S1, a second lens L2, a third lens L3, and a fourth lens L4. The prism group L5 may include one or more prisms. An optical filter GF or other optical elements may be disposed between the prism group L5 and the image plane Si of the image sensor.

[0018] Prism group L5 is positioned between the lens group and the image plane Si along the light propagation path. Prism group L5 has an incident surface B1, multiple reflecting surfaces, and an exit surface B7 along the light path. Light rays exiting the lens group pass through the incident surface B1 and enter prism group L5. After multiple reflections within prism group L5, they exit through the exit surface B7 and are projected onto the image plane Si. By changing the direction of light propagation through multiple reflections, the light rays are folded back multiple times within prism group L5, achieving optical path folding and thus shortening the thickness of the camera optical lenses 10, 20, and 30.

[0019] The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, and the prism assembly L5 is made of glass. Other materials may also be used for the individual lenses or prisms.

[0020] The thickness of the camera optical lenses 10, 20, and 30 is defined as TZ. To better define the thickness direction and light propagation direction of the camera optical lenses 10, 20, and 30, refer to... Figure 1 , Figure 5 as well as Figure 9As shown, this application defines a rectangular coordinate system, which includes a Z-axis extending horizontally as shown in the figure and a Y-axis extending vertically as shown in the figure. The thickness direction of the camera optical lenses 10, 20, and 30 is the Z-axis direction of the coordinate system shown in the figure. The total optical length of the camera optical lenses 10, 20, and 30 is TTL, satisfying the following relationship: 0.25≤TZ / TTL≤0.40. The specified thickness-to-total-length ratio of the camera optical lenses 10, 20, and 30 can reduce their thickness, making their structure more compact and facilitating ultra-thin designs. When the lower limit is exceeded, the layout space of the prism group L5 and the lens group is insufficient, easily leading to structural interference. When the upper limit is exceeded, the overall space occupied by the camera optical lenses 10, 20, and 30 increases, and the structural compactness decreases.

[0021] The focal length of the third lens L3 is defined as f3, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 0.70 ≤ f3 / f4 ≤ 1.30. The ratio of the focal length f3 of the third lens L3 to the focal length f4 of the fourth lens L4 is specified. Through the reasonable allocation of focal lengths, the system achieves better imaging quality and lower sensitivity.

[0022] The sagitta of the object-side surface of the first lens L1 is defined as SAG11, which is the displacement parallel to the optical axis from the intersection of the object-side surface of the first lens L1 with the optical axis to the maximum effective radius of the object-side surface of the first lens L1. The central radius of curvature of the object-side surface of the first lens L1 is R1, satisfying the following relationship: 0.18≤SAG11 / R1≤0.30. This is beneficial for collecting light rays from a large field of view, achieving high angular resolution at the center of the optical lens, and thus improving the imaging quality of the central region.

[0023] In the embodiments provided in this application, reference is made to Figure 1 As shown, multiple reflecting surfaces along the optical path include a first reflecting surface B2, a second reflecting surface B3, a third reflecting surface B4, a fourth reflecting surface B5, and a fifth reflecting surface B6, thus forming optical path nodes for successive reflections.

[0024] After passing through the lens group, the light rays enter the prism group L5 through the incident surface B1 along the first optical axis G1. The extension direction of the first optical axis G1 is the Z-axis direction shown in the figure. At least a portion of the light rays passing through the incident surface B1 are reflected at the first reflecting surface B2 and propagate along the second optical axis G2. The extension direction of the second optical axis G2 is inclined to the Y-axis and Z-axis directions shown in the figure.

[0025] At least a portion of the light rays reflected from the first reflecting surface B2 are incident on the second reflecting surface B3, and after being reflected at the second reflecting surface B3, they propagate along the direction of the third optical axis G3, the extension direction of the third optical axis G3 being inclined to the Y-axis and Z-axis directions in the figure.

[0026] At least a portion of the light rays reflected from the second reflecting surface B3 are incident on the third reflecting surface B4, and after being reflected at the third reflecting surface B4, they propagate along the fourth optical axis G4. The extension direction of the fourth optical axis G4 is inclined to the Y-axis and Z-axis directions shown in the figure. Preferably, the extension direction of the center line of the angle between the third optical axis G3 and the fourth optical axis G4 is parallel to the Z-axis direction.

[0027] At least a portion of the light rays reflected from the third reflecting surface B4 are incident on the fourth reflecting surface B5, and after being reflected at the fourth reflecting surface B5, they propagate along the fifth optical axis G5. The extension direction of the fifth optical axis G5 is inclined to the Y-axis and Z-axis directions shown in the figure. Preferably, the extension direction of the center line of the angle between the second optical axis G2 and the fifth optical axis G5 is parallel to the Z-axis direction.

[0028] At least a portion of the light rays reflected from the fourth reflecting surface B5 are incident on the fifth reflecting surface B6, and after being reflected at the fifth reflecting surface B6, they exit the prism along the sixth optical axis G6 through the exiting surface B7. The extension direction of the sixth optical axis G6 is the Z-axis direction shown in the figure.

[0029] The incident surface B1, the second reflecting surface B3, the fourth reflecting surface B5, and the exiting surface B7 are all located in the same plane and are all parallel to the third reflecting surface B4, extending along the Y-axis direction shown in the figure. The first reflecting surface B2 and the fifth reflecting surface B6 are symmetrically arranged, and the angle between the first reflecting surface B2 and the incident surface B1 is equal to the angle between the fourth reflecting surface B5 and the exiting surface B7, thus constructing a symmetrical and regular optical path framework and improving the overall symmetry of the optical path.

[0030] The angle θ between the incident surface B1 and the first reflecting surface B2 determines the deflection angle of the light after entering the prism group L5. This constrains the refracting span and propagation direction of the light in each segment of the light path within the prism group L5, ensuring that the light undergoes multiple reflections along a preset path within the prism group L5, thus achieving light path folding. The angle θ is limited to satisfy the following relationship: 25.00≤θ≤35.00. Within this preset value range, this angle θ constrains the deflection amplitude of the light in each reflection, controlling the thickness of the camera optical lenses 10, 20, and 30 in the Z-axis direction and the length in the Y-axis direction, so that the dimensions of the lenses in both the thickness and length dimensions are matched, balancing the volume of the camera optical lenses 10, 20, and 30.

[0031] Under the above conditions, the camera optical lenses 10, 20, and 30 have good optical performance while meeting the design requirements of large aperture and ultra-thin design. Based on the characteristics of the camera optical lenses 10, 20, and 30, they are particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0032] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0033] The object-side surface of the first lens L1 is convex near the axis, and the image-side surface is either concave or 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 or convex distributions.

[0034] The focal lengths of the camera optical lenses 10, 20, and 30 are defined as f, and the focal length of the first lens L1 is defined as f1, satisfying the following relationship: 0.33≤f1 / f≤0.38. By controlling the positive optical power of the first lens L1 within a reasonable range, it is beneficial to correct the system aberrations of the camera optical lenses 10, 20, and 30.

[0035] The central radius of curvature of the image side of the first lens L1 is R2, which satisfies the following relationship: -1.26≤(R1+R2) / (R1-R2)≤-0.92. By reasonably controlling the shape of the first lens L1, the first lens L1 can effectively correct the spherical aberration of the system.

[0036] The on-axis thickness of the first lens L1 is d1, which satisfies the following relationship: 0.058≤d1 / TTL≤0.065. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0037] 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 second lens L2 has positive refractive power. The object-side and image-side surfaces of the second lens L2 can also be configured with other concave and convex distributions.

[0038] The focal lengths of the camera optical lenses 10, 20, and 30 are defined as f, and the focal length of the second lens L2 is defined as f2, satisfying the following relationship: 1.03≤f2 / f≤1.17. By controlling the positive 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.

[0039] 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: -1.18≤(R3+R4) / (R3-R4)≤-1.02, 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 problems.

[0040] The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.020≤d3 / TTL≤0.026. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0041] 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.

[0042] The focal lengths of the camera optical lenses 10, 20, and 30 are defined as f, satisfying the following relationship: -0.58 ≤ f3 / f ≤ -0.47. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0043] 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: 1.64≤(R5+R6) / (R5-R6)≤2.33. This defines 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.

[0044] The on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.013≤d5 / TTL≤0.017. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0045] The object-side surface of the fourth lens L4 is either convex or concave near the axis, while the image-side surface is concave near the axis. The fourth lens L4 has negative refractive power. The object-side and image-side surfaces of the fourth lens L4 can also be configured with other concave or convex distributions.

[0046] The focal lengths of the camera optical lenses 10, 20, and 30 are defined as f, satisfying the following relationship: -0.68≤f4 / f≤-0.44. Through the reasonable allocation of optical power, the system has better imaging quality and lower sensitivity.

[0047] The center radius of curvature of the object side of the fourth lens L4 is R7, and the center radius of curvature of the image side of the fourth lens L4 is R8, and the following relationship is satisfied: 0.85≤(R7+R8) / (R7-R8)≤1.23, which defines the shape of the fourth lens L4. When within the range, with the development of ultra-thin wide-angle lenses, it is beneficial to correct aberrations and other problems in off-axis drawing angles.

[0048] The on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.005≤d7 / TTL≤0.016. Within the range of the condition, it is beneficial to achieve ultra-thinness.

[0049] The aperture values ​​(Fno) of the 10, 20, and 30mm camera lenses satisfy the following relationship: 3.25 ≤ Fno ≤ 3.27. This achieves a large aperture, resulting in good imaging performance for the 10, 20, and 30mm camera lenses.

[0050] Reference Figure 1 , Figure 5 as well as Figure 9 As shown, light passing through the lens group is transmitted through the incident surface B1 into the prism group L5; after traveling a distance T51 along the optical axis, it reaches the first reflecting surface B2; at least some of the light passing through the incident surface B1 is reflected at the first reflecting surface B2; it travels a distance T52 along the Z-axis to reach the second reflecting surface B3; at the second reflecting surface B3, at least some of the light reflected from the first reflecting surface is reflected; it travels a distance T53 along the Z-axis to reach the third reflecting surface B4; at the third reflecting surface B4, at least some of the light reflected from the second reflecting surface B3 is reflected; it travels a distance T54 along the Z-axis to reach the fourth reflecting surface B5; at the fourth reflecting surface B5, at least some of the light reflected from the third reflecting surface B4 is reflected; it travels a distance T55 along the Z-axis to reach the fifth reflecting surface B6; at the fifth reflecting surface B6, at least some of the light reflected from the fourth reflecting surface B5 is reflected; it travels a distance T56 along the Z-axis to reach the exit surface B7; at least some of the light passes through the exit surface B7, leaves the prism group L5, and reaches the image sensor. The following relationships must be satisfied: 2.09≤T51≤2.44; 4.16≤T52≤4.95; 8.33≤T53≤9.90; 8.33≤T54≤9.90; 4.16≤T55≤4.95; 2.09≤T56≤2.44. By setting the propagation distance on each segment of the reflection path, the direction of the light rays exiting the final prism group L5 can be stabilized, accurately converging onto the image plane Si of the image sensor, thus improving imaging reliability.

[0051] 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: 12.331≤TTL / IH≤13.125, which is beneficial to achieving ultra-thinness.

[0052] 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.

[0053] 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.

[0054] 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; The technical solution of the present invention will be described in detail below with three embodiments. At the same time, a comparative embodiment is provided for reference. The technical effects of the present invention cannot be achieved when the above-described conditions are not met.

[0055] (First Implementation) In this embodiment, the first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, and the prism group L5 is made of glass.

[0056] The object-side surface of the first lens L1 is convex at the paraxial direction, and the image-side surface is concave 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 convex at the paraxial direction, and the image-side surface is 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 concave at the paraxial direction.

[0057] The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, and the fourth lens L4 has negative refractive power.

[0058] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0059] Table 1

[0060] The meanings of each symbol are as follows.

[0061] 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 incident surface B1 of prism group L5; R10: The central radius of curvature of the exit surface B7 of prism group L5; 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 incident surface B1 of the prism group L5; d9: The on-axis distance from the incident surface B1 to the exit surface B7 of prism group L5; d10: The on-axis distance from the exit surface B7 of prism group L5 to the object side surface of optical filter GF; d11: On-axis thickness of the optical filter GF; d12: 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 group L5; 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 group L5; vg: Abbe number of the optical filter GF.

[0062] Table 2 shows the aspherical data of each lens in the camera optical lens 10 of the first embodiment of the present invention.

[0063] Table 2

[0064] 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).

[0065] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r 14 +A16r 16 +A18r 18 +A20r 20 (1) 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).

[0066] Figure 2 , Figure 3 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 550nm, 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 550nm 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.

[0067] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 10.647 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 10.75°, the image height IHm of the MIC field of view is 4.130 mm, and the field of view FOVm of the MIC field of view is 13.50°. The camera optical lens 10 meets the design requirements of large aperture and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0068] (Second Implementation) The symbols in the second embodiment have the same meaning as those in the first embodiment. The difference is that in the first embodiment, the object-side surface of the fourth lens L4 is convex near the axis, while in the second embodiment, the object-side surface of the fourth lens L4 is concave near the axis.

[0069] Figure 5 The image shows the camera optical lens 20 according to the second embodiment of the present invention.

[0070] Tables 3 and 4 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0071] Table 3

[0072] Table 4 shows the aspherical data of each lens in the camera optical lens 20 of the second embodiment of the present invention.

[0073] Table 4

[0074] Figure 6 , Figure 7 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 550nm, 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 550nm 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.

[0075] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 11.268 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 10.17°, the image height IHm of the MIC field of view is 4.120 mm, and the field of view FOVm of the MIC field of view is 12.75°. The camera optical lens 20 meets the design requirements of large aperture and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0076] (Third implementation method) The symbols in the third embodiment have the same meaning as those in the first embodiment. The difference is that in the first embodiment, the image-side surface of the first lens L1 is concave near the axis, while in the third embodiment, the object-side surface of the first lens L1 is convex near the axis.

[0077] Figure 9 The image shown is the camera optical lens 30 according to the third embodiment of the present invention.

[0078] Tables 5 and 6 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0079] Table 5

[0080] Table 6 shows the aspherical data of each lens in the camera optical lens 30 of the third embodiment of the present invention.

[0081] Table 6

[0082] Figure 10 , Figure 11 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 650nm, 610nm, 550nm, 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 550nm 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.

[0083] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 11.590 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 9.89°, the image height IHm of the MIC field of view is 4.120 mm, and the field of view FOVm of the MIC field of view is 12.40°. The camera optical lens 30 meets the design requirements of large aperture and ultra-thin design, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0084] Table 7 shows the values ​​corresponding to various numerical values ​​and parameters specified in the conditional expressions for each of the three implementation methods.

[0085] Table 7

[0086] 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 image consists of a lens group, a prism group, and an image plane, arranged sequentially from the object side to the image side. The lens group comprises four lenses, which are arranged in the following order from the object side to the image side: a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, and a fourth lens with negative refractive power. The prism group is positioned between the lens group and the image plane along the light propagation path. The prism group has an incident surface, multiple reflecting surfaces, and an exit surface along the light path. Light rays emitted from the lens group pass through the incident surface and enter the prism group. After undergoing multiple reflections within the prism group through the multiple reflecting surfaces, the light rays exit from the exit surface and are projected onto the image plane to form an image. Wherein, the thickness of the camera optical lens is TZ, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.25≤TZ / TTL≤0.

40.

2. The camera optical lens according to claim 1, characterized in that, The third lens has a focal length of f3, and the fourth lens has a focal length of f4, satisfying the following relationship: 0.70≤f3 / f4≤1.

30.

3. The camera optical lens according to claim 1, characterized in that, The elevation at the maximum effective optical diameter of the first lens object side is SAG11, the central radius of curvature of the first lens object side is R1, and the following relationship is satisfied: 0.18≤SAG11 / R1≤0.

30.

4. The camera optical lens according to claim 1, characterized in that, The plurality of reflecting surfaces, along the direction of the optical path, include, in sequence, a first reflecting surface, a second reflecting surface, a third reflecting surface, a fourth reflecting surface, and a fifth reflecting surface; After passing through the lens group, the light rays enter the prism group through the incident surface along the first optical axis. At least a portion of the light rays passing through the incident surface are reflected at the first reflecting surface and propagate along the second optical axis. At least a portion of the light rays reflected from the first reflecting surface are incident on the second reflecting surface, and after being reflected at the second reflecting surface, they propagate along the third optical axis. At least a portion of the light rays reflected from the second reflecting surface are incident on the third reflecting surface, and after being reflected at the third reflecting surface, they propagate along the fourth optical axis. At least a portion of the light rays reflected from the third reflecting surface are incident on the fourth reflecting surface, and after being reflected at the fourth reflecting surface, they propagate along the fifth optical axis. At least a portion of the light rays reflected from the fourth reflecting surface are incident on the fifth reflecting surface, and after being reflected at the fifth reflecting surface, they exit the prism assembly along the sixth optical axis through the exiting surface. The incident surface, the second reflecting surface, the fourth reflecting surface, and the exiting surface are located in the same plane and are all parallel to the third reflecting surface. The angle between the first reflecting surface and the incident surface is equal to the angle between the fourth reflecting surface and the exiting surface. Wherein, the angle between the incident surface and the first reflecting surface is θ, and satisfies the following relationship: 25.00≤θ≤35.

00.

5. The camera optical lens according to claim 1, characterized in that, The object-side surface of the first lens is convex near the axis; The focal length of the camera optical lens is f, 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 they satisfy the following relationship: 0.33≤f1 / f≤0.38; -1.26≤(R1+R2) / (R1-R2)≤-0.92; 0.058≤d1 / TTL≤0.

065.

6. 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 camera optical lens is f, 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 on-axis thickness of the second lens is d3, and they satisfy the following relationship: 1.03≤f² / f≤1.17; -1.18≤(R3+R4) / (R3-R4)≤-1.02; 0.020≤d3 / TTL≤0.

026.

7. 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 camera optical lens is f, 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: -0.58≤f3 / f≤-0.47; 1.64≤(R5+R6) / (R5-R6)≤2.33; 0.013≤d5 / TTL≤0.

017.

8. The camera optical lens according to claim 1, characterized in that, The image-side surface of the fourth lens is concave at the paraxial position; The focal length of the camera optical lens is f, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the fourth lens is R7, and the central radius of curvature of the image side of the fourth lens is R8, and the following relationship is satisfied: -0.68≤f4 / f≤-0.44; 0.85≤(R7+R8) / (R7-R8)≤1.23; 0.005≤d7 / TTL≤0.

016.

9. The camera optical lens according to claim 1, characterized in that, The aperture value of the camera optical lens is Fno, and it satisfies the following relationship: 3.25≤Fno≤3.

27.

10. The camera optical lens according to claim 1, characterized in that, The first lens is made of glass.

Images