Eight-piece camera lens
Through the specific refractive power configuration and surface design of the eight-piece camera lens, the optical lens design problems of large wide angles and high imaging quality are solved, achieving wide angle characteristics and optimized imaging effects.
Patent Information
- Application Number
- CN202421977292.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-15
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-08-15
AI Technical Summary
It is difficult for the prior art to design optical lenses that combine large wide angles and high imaging quality.
The eight-piece camera lens is adopted, and the specific refractive power configuration and surface design, including the combination of negative and positive refractive power lenses, meet specific relationships to optimize lens performance.
The wide-angle characteristics are achieved and the imaging quality is improved, astigmatism and chromatic aberration are corrected, the light input volume is increased, and the production yield is improved.
Smart Images
Figure CN223193191U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to an optical lens, and in particular to an eight-element camera lens. Background Art
[0002] Optical lenses are widely used by people, among which wide-angle lenses are applied in many occasions due to their wide viewing angle. However, how to achieve both wide angle and image quality is indeed worthy of consideration by people in this field. Utility Model Content
[0003] The technical problem to be solved by this application is to provide an eight-element camera lens that can achieve both wide angle and imaging quality.
[0004] In order to achieve the above and other purposes, the present invention provides an eight-lens camera lens, which includes, from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an aperture, a sixth lens, a seventh lens, and an eighth lens. The second lens has negative refractive power, and its object side and image side are both concave. The third lens has negative refractive power. The object side and image side of the fourth lens are both concave. The fifth lens has positive refractive power, and its object side is convex. The object side of the sixth lens is convex. The seventh lens has negative refractive power, and its image side is convex. The object side of the eighth lens is convex. Through the coordination of the aforementioned refractive power configuration and surface shape, the lens of the present invention can exert wide-angle characteristics and bring better imaging quality.
[0005] To achieve the above and other objectives, the present invention provides an eight-element camera lens comprising, in order from the object side to the image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, an aperture, a sixth lens element, a seventh lens element, and an eighth lens element. The second lens element has negative refractive power, and both its object-side and image-side surfaces are concave. The third lens element has negative refractive power. The fifth lens element has positive refractive power, and its object-side surface is convex. The seventh lens element has negative refractive power, and its image-side surface is convex. By combining the aforementioned refractive power configuration and surface shape, the present lens can achieve wide-angle characteristics and provide better imaging quality.
[0006] For example, in the aforementioned eight-element camera lens, the following relationship can also be satisfied:
[0007] -24.5<(TA1 / TTL)×((F1+F2) / EFL)<-21.0; where TA1 is the distance between the object side of the first lens element and the aperture on an optical axis of the eight-element camera lens, TTL is the system length of the eight-element camera lens, EFL is the system focal length of the eight-element camera lens, F1 is the focal length of the first lens element, and F2 is the focal length of the second lens element; this provides the lens with wide-angle characteristics.
[0008] In the eight-piece imaging lens as described above, the following relationship can also be satisfied: 18 < TTL / EFL < 19.5; to make the lens have wide-angle characteristics.
[0009] In the eight-piece imaging lens as described above, the following relationship can also be satisfied:
[0010] -2.5 mm < (R13 + R14 + R15 + R16) ≦ -2.0 mm; where R13 is the curvature radius of the object side of the seventh lens, R14 is the curvature radius of the image side of the seventh lens, R15 is the curvature radius of the object side of the eighth lens, and R16 is the curvature radius of the image side of the eighth lens; by the combination of the curvature radii of the object sides and image sides of the seventh and eighth lenses, the effect of correcting astigmatism can be achieved.
[0011] In the eight-piece imaging lens as described above, the following relationship can also be satisfied: 1.04 < (V4 + V5) / (V6 + V7) ≦ 1.07; where V4 is the dispersion coefficient of the fourth lens, V5 is the dispersion coefficient of the fifth lens, V6 is the dispersion coefficient of the sixth lens, and V7 is the dispersion coefficient of the seventh lens; the chromatic aberration of the lens can be optimized.
[0012] In the eight-piece imaging lens as described above, the following relationship can also be satisfied:
[0013] 1.80 ≦ (EFL / EPD) ≦ 1.81; where EFL is the system focal length of the eight-piece imaging lens, and EPD is the entrance pupil diameter of the eight-piece imaging lens; the light input of the lens can be increased, and the brightness of the imaging picture can be improved.
[0014] In the eight-piece imaging lens as described above, the following relationship can also be satisfied: 0.095 mm^-2 < (F2 + F3 + F4) / (F2 × F3 × F4) < 0.107 mm^-2; where F2 is the focal length of the second lens, F3 is the focal length of the third lens, and F4 is the focal length of the fourth lens; the production yield can be improved.
[0015] In the eight-piece imaging lens as described above, the following relationship can also be satisfied: 2.3 ≦ MAXIH / EFL ≦ 2.7; where MAXIH is the maximum imaging height of the eight-piece imaging lens, and EFL is the system focal length of the eight-piece imaging lens; to make the lens have wide-angle characteristics.
[0016] Regarding other effects of this application and the detailed content of the embodiments, it will be described below in conjunction with the drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 is a schematic diagram of the first embodiment of the present application;
[0019] Figure 2 is a schematic diagram of the second embodiment of the present application;
[0020] Figure 3 is a schematic diagram of the third embodiment of the present application;
[0021] Figure 4 is a schematic diagram of a fourth embodiment of the present application;
[0022] Figure 5 It is a schematic diagram of the fifth embodiment of the present application.
[0023] Explanation of symbols
[0024] 10: First lens 20: Second lens
[0025] 30: Third lens 40: Fourth lens
[0026] 50: Fifth lens 60: Sixth lens
[0027] 70: Seventh lens 80: Eighth lens
[0028] 90: Flat lens A: Object side
[0029] B: Image side ST: Aperture
[0030] L: Optical axis DETAILED DESCRIPTION
[0031] The positional relationships described in the following embodiments include up, down, left, and right. Unless otherwise specified, they are based on the directions of the components shown in the drawings.
[0032] Please refer to Figure 1, shown is a first embodiment of the present invention. The eight-element camera lens includes, in order from the object side A to the image side B on the optical axis L, a first lens element 10, a second lens element 20, a third lens element 30, a fourth lens element 40, a fifth lens element 50, an aperture ST, a sixth lens element 60, a seventh lens element 70, and an eighth lens element 80. A CCD, CMOS, or other photosensitive element (not shown) is provided on the image side B. A flat lens element 90, such as a filter or protective glass, may be provided between the photosensitive element and the eighth lens element 80. The number of flat lens elements 90 may be increased or decreased, or omitted, as needed.
[0033] First, it should be noted that, in this document, when the center of a surface is closer to the image side than the surface itself, the radius of curvature of the surface is positive. Conversely, when the center of a surface is closer to the object side than the surface itself, the radius of curvature of the surface is negative. Unless otherwise specified, the concave and convex surface shapes and curvature radii of the "object-side" and "image-side" surfaces refer to the surface shapes and curvature radii at the optical axis L.
[0034] In the first embodiment of the present invention, the first lens 10 has negative refractive power, and its object-side surface is convex and its image-side surface is concave.
[0035] The second lens 20 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave.
[0036] The third lens 30 has negative refractive power, and its object-side surface is convex and its image-side surface is concave.
[0037] The fourth lens element 40 has negative refractive power, and both the object-side surface and the image-side surface thereof are concave.
[0038] The fifth lens 50 has positive refractive power, and its object-side surface is convex and its image-side surface is concave.
[0039] The sixth lens element 60 has positive refractive power, and both the object-side surface and the image-side surface thereof are convex.
[0040] The seventh lens element 70 has negative refractive power, and its object-side surface is concave and its image-side surface is convex.
[0041] The eighth lens element 80 has positive refractive power, and both the object-side surface and the image-side surface thereof are convex.
[0042] In this embodiment, the first and fifth lenses 10 and 50 are made of glass, and both the object-side and image-side surfaces of the first and fifth lenses 10 and 50 are spherical. The second, third, fourth, sixth, seventh, and eighth lenses 20, 30, 40, 60, 70, and 80 are made of plastic, and both the object-side and image-side surfaces of the second, third, fourth, sixth, seventh, and eighth lenses 20, 30, 40, 60, 70, and 80 are aspherical. This embodiment achieves a wide-angle effect by matching the focal lengths of the first, second, and third lenses, and can also correct chromatic aberration by matching the lens materials.
[0043] The design parameters of the eight-element camera lens of this embodiment are shown in Table 1 below. It should be noted that the distance values corresponding to the object side represent the thickness of the lens on the optical axis L (on-axis thickness), and the distance values corresponding to the image side represent the spacing between the lens and the next lens element or the next aperture ST on the optical axis L (on-axis spacing):
[0044] Table 1
[0045]
[0046]
[0047] Among them, the surface shape of the aspheric surface satisfies the following aspheric surface formula:
[0048]
[0049] Where c = 1 / r, r is the surface curvature radius, h is the height of the light on this surface, k is the cone coefficient, B is the fourth-order coefficient, C is the sixth-order coefficient, D is the eighth-order coefficient, E is the tenth-order coefficient, F is the twelfth-order coefficient, G is the fourteenth-order coefficient, and H is the sixteenth-order coefficient. The parameters of each aspheric surface in this embodiment are shown in Table 2 below:
[0050] Table 2
[0051]
[0052]
[0053] According to Table 1 and Table 2, we can get the following relationship values in Table 3: Table 3
[0054]
[0055]
[0056] In this way, through the combination of the lenses, the eight-element camera lens of this embodiment can exhibit good imaging quality.
[0057] Please refer to Figure 2 The second embodiment of the present application is shown, and its lens configuration is substantially the same as that of the first embodiment. The design parameters of the eight-element camera lens of this embodiment are shown in Table 4 below:
[0058] Table 4
[0059]
[0060]
[0061] The parameters of each aspheric surface in this embodiment are shown in Table 5 below: Table 5
[0062]
[0063]
[0064] Based on Table 4 and Table 5, we can get the following relationship values in Table 6:
[0065] Table 6
[0066] Relational Numerical (TA1 / TTL)×((F1+F2) / EFL) -22.5 TTL / EFL 18.7 (R13+R14+R15+R16) -2.3mm (V4+V5) / (V6+V7) 1.05 (EFL / EPD) 1.80 (F2+F3+F4) / (F2×F3×F4) 0.097mm^-2 MAXIH / EFL 2.3
[0067] In this way, through the combination of the lenses, the eight-element camera lens of this embodiment can exhibit good imaging quality.
[0068] Please refer to Figure 3 The third embodiment of the present application is shown, and its lens configuration is substantially the same as that of the first embodiment. The design parameters of the eight-element camera lens of this embodiment are shown in Table 7 below:
[0069] Table 7
[0070]
[0071]
[0072] The parameters of each aspheric surface in this embodiment are shown in Table 8 below: Table 8
[0073]
[0074]
[0075] According to Table 7 and Table 8, the following relational values can be obtained in Table 9:
[0076]
[0077]
[0078] In this way, through the combination of the lenses, the eight-element camera lens of this embodiment can exhibit good imaging quality.
[0079] Please refer to Figure 4 , which is the fourth embodiment of the present application, and its lens configuration is substantially the same as that of the first embodiment. The design parameters of the eight-element camera lens of this embodiment are shown in Table 10 below:
[0080] Table 10
[0081]
[0082]
[0083] The parameters of each aspheric surface in this embodiment are shown in Table 11 below: Table 11
[0084]
[0085]
[0086] According to Table 10 and Table 11, the numerical values of the relationship in Table 12 can be obtained:
[0087] Table 12
[0088] Relational Numerical (TA1 / TTL)×((F1+F2) / EFL) -23.0 TTL / EFL 18.3 (R13+R14+R15+R16) -2.0mm (V4+V5) / (V6+V7) 1.05 (EFL / EPD) 1.80 (F2+F3+F4) / (F2×F3×F4) 0.097mm^-2 MAXIH / EFL 2.5
[0089] In this way, through the combination of the lenses, the eight-element camera lens of this embodiment can exhibit good imaging quality.
[0090] Please refer to Figure 5 The fifth embodiment of the present application is shown, and its lens configuration is substantially the same as that of the first embodiment. The design parameters of the eight-element camera lens of this embodiment are shown in Table 13 below:
[0091] Table 13
[0092]
[0093]
[0094] The parameters of each aspheric surface in this embodiment are shown in Table 14 below: Table 14
[0095]
[0096]
[0097] According to Table 13 and Table 14, the numerical values of the relationship in Table 15 can be obtained: Table 15
[0098]
[0099]
[0100] In this way, through the combination of the lenses, the eight-element camera lens of this embodiment can exhibit good imaging quality.
[0101] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the present application, and do not impose any form of limitation on the implementation methods of the technology of the present application. Any person skilled in the art may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the present application, but they should still be regarded as technologies or embodiments that are essentially the same as those of the present application.
Claims
1. An eight-element camera lens, characterized in that: The eight-piece imaging lens sequentially includes, from the object side to the image side: A first lens; A second lens, having a negative refractive power, with both its object side and its image side being concave; A third lens, having a negative refractive power; A fourth lens, with both its object side and its image side being concave; A fifth lens, having a positive refractive power, with its object side being convex; An aperture; A sixth lens, with its object side being convex; A seventh lens, having a negative refractive power, with its image side being convex; and An eighth lens, with its object side being convex.
2. An eight-element camera lens, characterized in that: The eight-piece imaging lens sequentially includes, from the object side to the image side: A first lens; A second lens, having a negative refractive power, with both its object side and its image side being concave; A third lens, having a negative refractive power; A fourth lens; A fifth lens, having a positive refractive power, with its object side being convex; An aperture; A sixth lens; A seventh lens, having a negative refractive power, with its image side being convex; and An eighth lens.
3. The eight-element camera lens according to claim 1 or 2, wherein: It further satisfies the following relationship: -24.5 < (TA1 / TTL)×((F1+F2) / EFL) < -21.0; where TA1 is the distance on the optical axis of the eight-piece imaging lens between the object side of the first lens and the aperture, TTL is the system length of the eight-piece imaging lens, EFL is the system focal length of the eight-piece imaging lens, F1 is the focal length of the first lens, and F2 is the focal length of the second lens.
4. The eight-element camera lens according to claim 1 or 2, wherein: It further satisfies the following relationship: 18 < TTL / EFL < 19.5; where TTL is the system length of the eight-piece imaging lens and EFL is the system focal length of the eight-piece imaging lens.
5. The eight-element camera lens according to claim 1 or 2, wherein: It further satisfies the following relationship: -2.5mm < (R13+R14+R15+R16) ≦ -2.0mm; where R13 is the radius of curvature of the object side of the seventh lens, R14 is the radius of curvature of the image side of the seventh lens, R15 is the radius of curvature of the object side of the eighth lens, and R16 is the radius of curvature of the image side of the eighth lens.
6. The eight-element camera lens according to claim 1 or 2, wherein: It further satisfies the following relationship: 1.04 < (V4+V5) / (V6+V7) ≦ 1.07; where V4 is the dispersion coefficient of the fourth lens, V5 is the dispersion coefficient of the fifth lens, V6 is the dispersion coefficient of the sixth lens, and V7 is the dispersion coefficient of the seventh lens.
7. The eight-element camera lens according to claim 1 or 2, wherein: It further satisfies the following relationship: 1.80 ≦ (EFL / EPD) ≦ 1.81; where EFL is the system focal length of the eight-piece imaging lens and EPD is the entrance pupil diameter of the eight-piece imaging lens.
8. The eight-element camera lens according to claim 1 or 2, wherein: It further satisfies the following relationship: 0.095mm^-2 < (F2+F3+F4) / (F2×F3×F4) < 0.107mm^-2; where F2 is the focal length of the second lens, F3 is the focal length of the third lens, and F4 is the focal length of the fourth lens.
9. The eight-element camera lens according to claim 1 or 2, wherein: It further satisfies the following relationship: 2.3 ≦ MAXIH / EFL ≦ 2.7; where MAXIH is the maximum imaging height of the eight-piece imaging lens and EFL is the system focal length of the eight-piece imaging lens.
10. The eight-element camera lens according to claim 1 or 2, wherein: Both the first lens and the fifth lens are made of glass, and both the object side and the image side of the first and fifth lenses are spherical surfaces.
11. The eight-element camera lens according to claim 1 or 2, wherein: The second, third, fourth, sixth, seventh and eighth lenses are all made of plastic, and the object side surfaces and image side surfaces of the second, third, fourth, sixth, seventh and eighth lenses are all aspherical.
12. The eight-element camera lens according to claim 1 or 2, wherein: The object side surfaces of the first and third lenses are both convex.
13. The eight-element camera lens according to claim 1 or 2, wherein: The image side surfaces of the first and third lenses are both concave.
14. The eight-element camera lens according to claim 1 or 2, wherein: The image-side surface of the fifth lens element and the object-side surface of the seventh lens element are both concave surfaces.
15. The eight-element camera lens according to claim 1 or 2, wherein: The image side surfaces of the sixth and eighth lenses are both convex.