Camera lens

Abstract

This invention relates to the field of optical lenses and discloses a camera optical lens comprising four lenses, 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 positive refractive power, and a fourth lens with negative refractive power. The focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the third lens is f3. The central radius of curvature of the object side of the first lens is R1, and the central radius of curvature of the image side of the first lens is R2, satisfying the following relationships: 0.24 ≤ f1 / f ≤ 0.79; -1.74 ≤ f2 / f ≤ -0.42; 0.53 ≤ f3 / f ≤ 2.13; -1.85 ≤ (R1 + R2) / (R1 - R2) ≤ -0.33. This camera optical lens exhibits excellent optical performance and meets the design requirements of wide-angle and ultra-thin designs.

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, four-element lens structures have emerged in lens designs. There is an urgent need for wide-angle camera lenses with excellent optical characteristics, large apertures, and adequate aberration correction. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a camera optical lens that possesses excellent optical performance while meeting the design requirements of wide-angle and ultra-thin design.

[0004] To solve the above-mentioned technical problems, embodiments of the present invention provide a camera optical lens, which comprises four lenses in total. The four lenses, from the object side to the image side, are in the following order: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power. The focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the third lens is f3. The central radius of curvature of the object side of the first lens is R1, and the central radius of curvature of the image side of the first lens is R2, satisfying the following relationships: 0.24≤f1 / f≤0.79; -1.74≤f2 / f≤-0.42; 0.53≤f3 / f≤2.13; -1.85≤(R1+R2) / (R1-R2)≤-0.33.

[0005] Optionally, the on-axis thickness of the first lens is d1, the total optical length of the camera lens is TTL, and the following relationship is satisfied: 0.04≤d1 / TTL≤0.13.

[0006] Optionally, the center radius of curvature of the object side of the second lens is R3, the center radius of curvature of the image side of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the camera lens is TTL, and satisfies the following relationships: 1.55≤(R3+R4) / (R3-R4)≤4.98; 0.01≤d3 / TTL≤0.05.

[0007] Optionally, the camera optical lens satisfies the following relationship: 2.48≤(R3+R4) / (R3-R4)≤3.98; 0.02≤d3 / TTL≤0.04.

[0008] Optionally, 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, the axial thickness of the third lens is d5, and the total optical length of the camera lens is TTL, and satisfies the following relationships: -8.26≤(R5+R6) / (R5-R6)≤-1.86; 0.03≤d5 / TTL≤0.08.

[0009] Optionally, the camera optical lens satisfies the following relationship: -5.17≤(R5+R6) / (R5-R6)≤-2.32; 0.04≤d5 / TTL≤0.07.

[0010] Optionally, the focal length of the fourth lens is f4, the central radius of curvature of the object side of the fourth lens is R7, the central radius of curvature of the image side of the third lens is R8, the on-axis thickness of the fourth lens is d7, and the total optical length of the camera lens is TTL, and satisfies the following relationships: -1.48≤f4 / f≤-0.32; -6.19≤(R7+R8) / (R7-R8)≤-1.44; 0.02≤d7 / TTL≤0.06.

[0011] Optionally, the camera optical lens satisfies the following relationships: -0.93≤f4 / f≤-0.40; -3.87≤(R7+R8) / (R7-R8)≤-1.80; 0.03≤d7 / TTL≤0.05.

[0012] Optionally, the field of view of the camera optical lens is FOV, and satisfies the following relationship: FOV≥48.00°.

[0013] Optionally, the aperture value of the camera optical lens is FNO, and satisfies the following relationship: FNO≤12.36.

[0014] The beneficial effects of the present invention are as follows: the camera optical lens according to the present invention has excellent optical characteristics, and has the characteristics of wide-angle and ultra-thin, 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:

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

[0017] Figure 2 yes Figure 1 A schematic diagram of axial aberrations of the camera optical lens shown;

[0018] Figure 3 yes Figure 1 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0019] Figure 4 yes Figure 1 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0020] Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;

[0021] Figure 6 yes Figure 5 A schematic diagram of axial aberrations of the camera optical lens shown.

[0022] Figure 7 yes Figure 5 A schematic diagram of chromatic aberration at magnification for a camera lens;

[0023] Figure 8 yes Figure 5 A schematic diagram of field curvature and distortion of the camera optical lens shown;

[0024] Figure 9 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;

[0025] Figure 10 yes Figure 9 A schematic diagram of axial aberrations of the camera optical lens shown;

[0026] Figure 11 yes Figure 9A schematic diagram of chromatic aberration at magnification for a camera lens;

[0027] Figure 12 yes Figure 9 The diagram shows the field curvature and distortion of the camera lens. Detailed Implementation

[0028] 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.

[0029] (First Implementation)

[0030] Reference Appendix Figure 1 The present invention provides a camera optical lens 10. Figure 1 The image shown is a camera optical lens 10 according to a first embodiment of the present invention. The camera optical lens 10 includes four lenses. Specifically, the camera optical lens 10, from the object side to the image side, consists of: an aperture S1, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. An optical element such as an optical filter GF may be disposed between the fourth lens L4 and the image plane S1.

[0031] In this embodiment, the first lens L1 is made of glass with grade H-LAF53, the second lens L2 is made of glass with grade H-ZF52A, the third lens L3 is made of glass with grade H-F4, and the fourth lens L4 is made of glass with grade H-ZF5. In other optional embodiments, the lenses may be made of other materials.

[0032] In this embodiment, the focal length of the camera optical lens 10 is defined as f, and the focal length of the first lens L1 is defined as f1, satisfying the following relationship: 0.24≤f1 / f≤0.79. This specifies the ratio of the focal length f1 of the first lens L1 to the focal length f of the camera optical lens 10, which can effectively balance the field curvature of the camera optical lens 10.

[0033] The focal length of the camera optical lens 10 is f, and the focal length of the second lens L2 is defined as f2, satisfying the following relationship: -1.74≤f2 / f≤-0.42. This specifies the ratio of the focal length f2 of the second lens L2 to the focal length f of the camera optical lens 10. Through the reasonable allocation of focal lengths, the camera optical lens 10 has better imaging quality and lower sensitivity.

[0034] The focal length of the camera optical lens 10 is f, and the focal length of the third lens L3 is defined as f3, satisfying the following relationship: 0.53≤f3 / f≤2.13. This specifies the ratio of the focal length f3 of the third lens L3 to the focal length f of the camera optical lens 10. Through the reasonable allocation of focal lengths, the camera optical lens 10 has better imaging quality and lower sensitivity.

[0035] The center radius of curvature of the object side of the first lens L1 is defined as R1, and the center radius of curvature of the image side of the first lens L1 is defined as R2, satisfying the following relationship: -1.85≤(R1+R2) / (R1-R2)≤-0.33. By reasonably controlling the shape of the first lens L1, the first lens L1 can effectively correct the spherical aberration of the system.

[0036] In this embodiment, the first lens L1 has positive refractive power, and its object-side surface is convex near the axis, as is its image-side surface. In other optional embodiments, the object-side and image-side surfaces of the first lens L1 may also be configured with other concave and convex distributions.

[0037] The total optical length of the camera lens 10 is defined as TTL, and the on-axis thickness of the first lens L1 is defined as d1, satisfying the following relationship: 0.04≤d1 / TTL≤0.13. Within the range of the condition, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.06≤d1 / TTL≤0.10.

[0038] In this embodiment, the second lens L2 has negative refractive power, its object-side surface is convex near the axis, and its image-side surface is concave near the axis. In other optional embodiments, the object-side and image-side surfaces of the second lens L2 may also be configured with other concave and convex distributions.

[0039] The central radius of curvature of the object-side surface of the second lens L2 is defined as R3, and the central radius of curvature of the image-side surface of the second lens L2 is defined as R4, satisfying the following relationship: 1.55≤(R3+R4) / (R3-R4)≤4.98. This defines the shape of the second lens L2. Within this range, as lenses develop towards ultra-thinness and wide-angle capabilities, it is beneficial for correcting on-axis chromatic aberration. Preferably, it satisfies 2.48≤(R3+R4) / (R3-R4)≤3.98.

[0040] The second lens L2 has an on-axis thickness of d3, and the total optical length of the imaging optical lens 10 is TTL, satisfying the following relationship: 0.01≤d3 / TTL≤0.05. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.02≤d3 / TTL≤0.04.

[0041] In this embodiment, the third lens L3 has positive refractive power, its object-side surface is convex near the axis, and its image-side surface is concave near the axis. In other optional embodiments, the object-side surface and image-side surface may also be configured with other concave and convex distributions.

[0042] The central radius of curvature of the object-side surface of the third lens L3 is defined as R5, and the central radius of curvature of the image-side surface of the third lens L3 is defined as R6, satisfying the following relationship: -8.26≤(R5+R6) / (R5-R6)≤-1.86. This defines the shape of the third lens L3, which is beneficial for its formation. Within the range specified by the condition, it can mitigate the degree of light refraction after passing through the lens and effectively reduce aberrations. Preferably, it satisfies -5.17≤(R5+R6) / (R5-R6)≤-2.32.

[0043] The total optical length of the camera lens 10 is TTL, and the on-axis thickness of the third lens L3 is d5, satisfying the following relationship: 0.03≤d5 / TTL≤0.08. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.04≤d5 / TTL≤0.07.

[0044] In this embodiment, the fourth lens L4 has negative refractive power, its object-side surface is concave near the axis, and its image-side surface is convex near the axis. In other optional embodiments, the object-side surface and image-side surface can also be configured with other concave and convex distributions.

[0045] The focal length of the imaging optical lens 10 is defined as f, and the focal length of the fourth lens is defined as f4, satisfying the following relationship: -1.48 ≤ f4 / f ≤ -0.32. This relationship specifies the ratio of the focal length f4 of the fourth lens L4 to the overall focal length f of the imaging optical lens 10. Through reasonable allocation of optical power, the system has better imaging quality and lower sensitivity. Preferably, -0.93 ≤ f4 / f ≤ -0.40 is satisfied.

[0046] The central radius of curvature of the object-side surface of the fourth lens L4 is R7, and the central radius of curvature of the image-side surface of the fourth lens L4 is R8, satisfying the following relationship: -6.19≤(R7+R8) / (R7-R8)≤-1.44. This defines the shape of the fourth lens L4. Within the specified range of the relationship, the degree of refraction of light passing through the lens can be mitigated, effectively reducing aberrations. Preferably, it satisfies -3.87≤(R7+R8) / (R7-R8)≤-1.80.

[0047] The total optical length of the camera lens 10 is TTL, and the on-axis thickness of the third lens L3 is d5, satisfying the following relationship: 0.02≤d7 / TTL≤0.06. Within this range, it is beneficial to achieve ultra-thinness. Preferably, it satisfies 0.03≤d7 / TTL≤0.05.

[0048] In this embodiment, the aperture value of the camera optical lens 10 is defined as FNO, satisfying the following relationship: FNO≤12.36, thereby achieving a large aperture and good imaging performance of the camera optical lens 10. Preferably, FNO≤12.12 is satisfied.

[0049] In this embodiment, the field of view of the camera optical lens 10 is defined as FOV, which satisfies the following relationship: FOV≥48.00°, thereby achieving wide-angle viewing.

[0050] The camera optical lens 10 has good optical performance while meeting the design requirements of wide-angle and ultra-thin design. Based on the characteristics of the camera optical lens 10, it is particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0051] The camera optical lens 10 of the present invention will be described below with examples. The symbols described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, and on-axis thickness are mm.

[0052] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image plane Si), in mm;

[0053] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens.

[0054] Tables 1 and 2 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0055] Table 1

[0056]

[0057]

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

[0059] S1: Aperture;

[0060] R: Radius of curvature at the center of the optical surface;

[0061] R1: The central radius of curvature of the object-side surface of the first lens L1;

[0062] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0063] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0064] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0065] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0066] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0067] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0068] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0069] d: Axial thickness of the lens, axial distance between lenses;

[0070] d0: The on-axis distance from aperture S1 to the object-side surface of the first lens L1;

[0071] d1: On-axis thickness of the first lens L1;

[0072] d2: 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;

[0073] d4: On-axis 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;

[0074] d6: On-axis distance from the image side of the third lens L3 to the object side of the fourth lens L4; d7: On-axis thickness of the fourth lens L4;

[0075] d8: The axial distance from the image-side surface of the fourth lens L4 to the image plane Si;

[0076] Figure 2 , Figure 3 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 486nm, 588nm, and 656nm 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 588nm 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.

[0077] (Second Implementation)

[0078] Figure 5The image shown is a camera optical lens 20 according to the second embodiment of the present invention. The second embodiment is basically the same as the first embodiment, and the symbols have the same meaning as the first embodiment. Only the differences are listed below.

[0079] Table 2 shows the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0080] Table 2

[0081]

[0082] Figure 6 , Figure 7 The diagrams show axial aberration and magnification chromatic aberration of light with wavelengths of 486nm, 588nm, and 656nm after passing 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 588nm 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.

[0083] (Third Implementation)

[0084] Figure 9 The image shown is the camera optical lens 30 of the third embodiment of the present invention. The third embodiment is basically the same as the first embodiment, and the symbols have the same meaning as the first embodiment. Only the differences are listed below.

[0085] Table 3 shows the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0086] Table 3

[0087]

[0088] Figure 10 , Figure 11 Axial aberration and magnification chromatic aberration are shown respectively after light with wavelengths of 486nm, 588nm, and 656nm passes through the camera optical lens 30 of the third embodiment.

[0089] Figure 12 This shows a schematic diagram of field curvature and distortion after light with a wavelength of 588nm 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.

[0090] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens, characterized in that, The camera optical lens 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 negative refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power. Wherein, the focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, the central radius of curvature of the object-side surface of the first lens is R1, the central radius of curvature of the image-side surface of the first lens is R2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the camera optical lens is TTL, and satisfies the following relationship: 0.24≤f1 / f≤0.79; -1.74≤f² / f≤-0.42; 0.53 ≤ f3 / f ≤ 2.13; -1.85≤(R1+R2) / (R1-R2)≤-0.33; 2.48≤(R3+R4) / (R3-R4)≤3.98; 0.02≤d3 / TTL≤0.

04.

2. The camera optical lens according to claim 1, characterized in that, The first lens has an axial thickness of d1 and satisfies the following relationship: 0.04≤d1 / TTL≤0.

13.

3. The camera optical lens according to claim 1, characterized in that, 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, the axial thickness of the third lens is d5, and the imaging optical lens satisfies the following relationship: -5.17≤(R5+R6) / (R5-R6)≤-2.32; 0.04≤d5 / TTL≤0.

07.

4. The camera optical lens according to claim 1, characterized in that, The fourth lens has a focal length of f4, a central radius of curvature of the object-side surface of the fourth lens of R7, a central radius of curvature of the image-side surface of the third lens of R8, and an on-axis thickness of d7. The imaging optical lens satisfies the following relationship: -0.93≤f4 / f≤-0.40; -3.87≤(R7+R8) / (R7-R8)≤-1.80; 0.03≤d7 / TTL≤0.

05.

5. The camera optical lens according to claim 1, characterized in that, The field of view (FOV) of the camera optical lens is given, and satisfies the following relationship: FOV ≥ 48.00°.

6. 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: FNO≤12.36.

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