Wide-angle mobile phone lens

Abstract

The application discloses a wide-angle mobile phone lens, which is developed from a flat optical plastic without a curvature radius through hammer type optimization and boundary parameter guidance limitation of a target mobile phone lens, and the wide-angle mobile phone lens has high image quality and is composed of a double-convex positive lens, a first double-concave negative lens, a first concave-convex positive lens, a second concave-convex positive lens, a third concave-convex positive lens, a second double-concave negative lens and a near-infrared filter which are sequentially arranged from front to back. Under the premise that a large number of asymmetric aberrations are generated in front of the diaphragm of the mobile phone lens, the application realizes 84-degree wide-angle imaging breakthrough design, and only through even aspheric surfaces, excellent image quality is realized, through reservation of trace aberrations of edge field points, increase of an edge beam aperture angle, improvement of edge beam relative luminance, and change of the fact that relative luminance is reduced with the increase of a field of view.

Description

Technical Field

[0001] The present invention relates to the technical field of mobile phone lenses, and in particular to a wide-angle mobile phone lens. Background Art

[0002] With the improvement of the design capabilities of mobile phone lens optical systems and the rapid development of the computer industry, the functions of mobile phone lenses tend to be diversified - photography modes with large functional differences such as wide angle, macro, portrait, zoom, etc. can also be integrated into one mobile phone lens to meet the photography needs of different scenes. The increasing power of mobile phone lens functions is conducive to improving the overall performance of smartphones, which is of great significance to the development of the industry and the enhancement of the core competitiveness of enterprises. At present, the mobile phone lenses on the market, such as the large relative aperture high-resolution mobile phone lens designed by Li Shenghui and others, use this system. E 48 R and LEXAN H Two aspherical plastic lens designs, including 5 plastic lenses, a near-infrared filter and a protective window glass. The mobile phone lens adopts a positive-negative-positive-negative structure design, and the lens focal length is 3.85 mm , relative aperture is 1 / 2.2, working band is 486~656 nm , with a field of view of 52°. While this mobile phone lens achieves excellent image quality within a 52° field of view, its maximum imaging field of 52° cannot meet the wide-angle and even ultra-wide-angle needs of the majority of consumers. In summary, there is still significant room for improvement in existing mobile phone lenses. Summary of the Invention

[0003] The present invention aims to solve the problem that the existing mobile phone lens has a small field of view, and provides a wide-angle mobile phone lens.

[0004] To solve the above problems, the present invention is achieved through the following technical solutions:

[0005] The wide-angle mobile phone lens is composed of a biconvex positive lens, a first biconcave negative lens, a first concave-convex positive lens, a second concave-convex positive lens, a third concave-convex positive lens, a second biconcave negative lens and a near-infrared filter. The biconvex positive lens is a single lens with a front surface curvature radius of r 1 is 3.7 mm ≤ r 1≤4.5 mm , the curvature radius of the rear surface r 2 is -6.7 mm ≤ r 2≤-5.8 mm , the center thickness of the front and rear surfaces d 1 is 0.35 mm ≤ d 1≤0.55 mm ,D Refractive index under light n d1 is 1.4 ≤ n d1 ≤ 1.6, D Abbe number under light v d1 is 54 ≤ v d1 ≤ 58. The first biconcave negative lens is a single lens, the radius of curvature of the front surface r 3 is -12 mm ≤ r 3 ≤ -10 mm , the radius of curvature of the back surface r 4 is 6 mm ≤ r 4 ≤ 8 mm , the central thickness of the front and back surfaces d 2 is 0.25 mm ≤ d 2 ≤ 0.6 mm , D Refractive index under light n d2 is 1.5 ≤ n d2 ≤ 1.7, D Abbe number under light v d2 is 21 ≤ v d2 ≤ 25. The first concave-convex positive lens is a single lens, the radius of curvature of the front surface r 5 is -24 mm ≤ r 5 ≤ -20 mm , the radius of curvature of the back surface r 6 is -7 mm ≤ r 6 ≤ -4 mm , the central thickness of the front and back surfaces d 3 is 0.45 mm ≤ d 3 ≤ 0.8 mm , D Refractive index under light n d3 is 1.4 ≤ n d3 ≤ 1.6, D Abbe number under light v d3 is 54 ≤ v d3 ≤ 58. The second concave-convex positive lens is a single lens, the radius of curvature of the front surface r 7 is -6.5 mm ≤ r 7 ≤ -3.5mm , the curvature radius of the rear surface r 8 is -2 mm ≤ r 8≤-1 mm , the center thickness of the front and rear surfaces d 4 is 0.65 mm ≤ d 4≤0.9 mm , D Refractive index under light n d4 1.4≤ n d4 ≤1.6, D Abbe number under light v d4 54≤ v d4 ≤58. The third concave-convex positive lens is a single lens, and the curvature radius of the front surface is r 9 to 2 mm ≤ r 9≤3 mm , the curvature radius of the rear surface r 10 is 10 mm ≤ r 10 ≤11 mm , the center thickness of the front and rear surfaces d 5 is 0.35 mm ≤ d 5≤0.55 mm , D Refractive index under light n d5 1.4≤ n d5 ≤1.6, D Abbe number under light v d5 28≤ v d5 ≤32. The second biconcave negative lens is a single lens with a front surface curvature radius of r 11 -9 mm ≤ r 11 ≤-6 mm , the curvature radius of the rear surface r 12 1.0 mm ≤ r 12 ≤1.1 mm , the center thickness of the front and rear surfaces d 6 is 0.35 mm ≤ d 6≤0.55 mm ,D Refractive index under light n d6 1.4≤ n d6 1.6, D Abbe number under light v d6 29≤ v d6 33.

[0006] In the above scheme, the biconvex positive lens, the first biconcave negative lens, the first concave-convex positive lens, the second concave-convex positive lens, the third concave-convex positive lens and the second biconcave negative lens are plastic lenses.

[0007] In the above scheme, the near-infrared filter is formed by glass coating.

[0008] Compared with the prior art, the present application has the following characteristics:

[0009] (1) The present application provides a method for designing a wide-angle mobile phone lens with zero starting point. Starting from a flat optical plastic without a curvature radius, a wide-angle, high-image-quality mobile phone lens is developed through hammer-type optimization and boundary parameter guidance limitation of the target mobile phone lens.

[0010] (2) Under the premise of generating a large number of asymmetric aberrations in front of the mobile phone lens aperture, a 84° wide-angle imaging breakthrough design is achieved, and excellent image quality is achieved only through even aspheric surfaces.

[0011] (3) By retaining a small amount of aberration of the edge field point, increasing the edge beam aperture angle, and improving the relative luminance of the edge beam, the fact that the relative luminance decreases with the increase of the field of view is changed. BRIEF DESCRIPTION OF DRAWINGS

[0012] mm is a structural schematic diagram of the wide-angle mobile phone lens of the present application.

[0013] mm is a wide-angle mobile phone lens of the present application mm graph.

[0014] mm is a point diagram of the wide-angle mobile phone lens of the present application under different fields of view.

[0015] mm is the field curvature and distortion diagram of the wide-angle mobile phone lens of the present application, (a) field curvature, (b) distortion.

[0016] mm is the relative luminance diagram of the wide-angle mobile phone lens of the present application.

[0017] Markings in the figure: 1-biconvex positive lens, 2-first biconcave negative lens, 3-first concave-convex positive lens, 4-second concave-convex positive lens, 5-third concave-convex positive lens, 6-second biconcave negative lens, 7-near-infrared filter. DETAILED DESCRIPTION

[0018] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific examples.

[0019] In order to increase the imaging field of view of the main camera lens of the mobile phone, reduce the weight of the mobile phone lens itself, provide a lens module that is easy to install, and meet the application requirements of wide-angle high-definition photography, the wide-angle mobile phone lens of the present invention uses flat optical plastic as the starting point, sets the system initial structure full field of view 90°, the aperture stop is on the front surface of the first lens (due to the structural requirements of the mobile phone lens, the system aperture stop is in front), the initial image space F The number is 3.0, limiting the system focal length to 3.1~3.5 mm The thickness of the glass center is 0.35~0.9 mm , minimum glass edge thickness 0.3 mm , minimum air edge thickness 0.1 mm , all plastic lenses use even aspheric surfaces, limiting the cone coefficient mm Based on the above initial structure, the wide-angle mobile phone lens designed by the present invention is as follows: mm As shown, it mainly consists of 6 plastic lenses in front and 1 near-infrared filter 7 in the back. The 6 plastic lenses are, from front to back, a biconvex positive lens 1, a first biconcave negative lens 2, a first concave-convex positive lens 3, a second concave-convex positive lens 4, a third concave-convex positive lens 5, and a second biconcave negative lens 6.

[0020] The biconvex positive lens 1 is a single lens with a front surface curvature radius of r 1 is 3.7 mm ≤ r 1≤4.5 mm , the radius of curvature of the rear surface r 2 is -6.7 mm ≤ r 2≤-5.8 mm , the center thickness of the front and rear surfaces d 1 is 0.35 mm ≤ d 1≤0.55 mm , D Refractive index under light n d1 1.4≤ n d1 ≤1.6, D Abbe number under light v d1 54≤v d1 ≤58;

[0021] The first biconcave negative lens 2 is a single lens, the radius of curvature of the front surface r 3 is -12 mm ≤ r 3 ≤ -10 mm , the radius of curvature of the back surface r 4 is 6 mm ≤ r 4 ≤ 8 mm , the central thickness of the front and back surfaces d 2 is 0.25 mm ≤ d 2 ≤ 0.6 mm , D The refractive index under light n d2 is 1.5 ≤ n d2 ≤ 1.7, D The Abbe number under light v d2 is 21 ≤ v d2 ≤ 25;

[0022] The first concave-convex positive lens 3 is a single lens, the radius of curvature of the front surface r 5 is -24 mm ≤ r 5 ≤ -20 mm , the radius of curvature of the back surface r 6 is -7 mm ≤ r 6 ≤ -4 mm , the central thickness of the front and back surfaces d 3 is 0.45 mm ≤ d 3 ≤ 0.8 mm , D The refractive index under light n d3 is 1.4 ≤ n d3 ≤ 1.6, D The Abbe number under light v d3 is 54 ≤ v d3 ≤ 58;

[0023] The second concave-convex positive lens 4 is a single lens, the radius of curvature of the front surface r 7 is -6.5 mm ≤ r 7 ≤ -3.5 mm , the radius of curvature of the back surface r 8 is -2 mm≤ r 8≤-1 mm , central thickness of front and rear surfaces d 4 is 0.65 mm ≤ d 4≤0.9 mm , D refractive index under light n d4 is 1.4≤ n d4 ≤1.6, D Abbe number under light v d4 is 54≤ v d4 ≤58;

[0024] The third convex positive lens 5 is a single lens, and the radius of curvature of the front surface r 9 is 2 mm ≤ r 9≤3 mm , the radius of curvature of the rear surface r 10 is 10 mm ≤ r 10 ≤11 mm , central thickness of front and rear surfaces d 5 is 0.35 mm ≤ d 5≤0.55 mm , D refractive index under light n d5 is 1.4≤ n d5 ≤1.6, D Abbe number under light v d5 is 28≤ v d5 ≤32;

[0025] The second biconcave negative lens 6 is a single lens, and the radius of curvature of the front surface r 11 is -9 mm ≤ r 11 ≤-6 mm , the radius of curvature of the rear surface r 12 is 1.0 mm ≤ r 12 ≤1.1 mm , central thickness of front and rear surfaces d 6 is 0.35 mm ≤ d 6≤0.55 mm ,D Refractive index under light n d6 1.4≤ n d6 ≤1.6, D Abbe number under light v d6 29≤ v d6 ≤33;

[0026] Near infrared filter 7, made of H - K 9. Glass coating formation, used for cutting off 750~1100 mm Near-infrared light.

[0027] Matches mm The company's image sensors mm 13 B 10, pixel size is 1.12μ m ×1.12μ m , resolution is 4208 mm ×3120 mm The 13-megapixel wide-angle mobile phone lens is composed of 6 plastic lenses and a rear near-infrared filter 7. The final design achieves a system focal length of 3.364 mm ,system F The number is 2.6, the full field of view angle is 84°, and the full image height is 5.860 mm , the maximum incident angle of the main ray on the image plane is 33.25°, and the total length of the system is 5.414 mm , lens back focus distance 1.217 mm , all plastic even-order aspheric design, strong processability. Mobile phone lens data table is shown in Table 1. Aspheric coefficient is shown in Table 2, k is the cone coefficient, A 4~ A 16 is the coefficient of each high-order term of the even-order aspheric surface.

[0028] Table 1 Structural parameters of wide-angle mobile phone lenses

[0029] mm mm mm mm mm mm mm mm mm mm mm mm mm 4.150 0.438 5014 1.542 56.833 2 mm -6.348 0.565 3 mm -10.141 0.351 -4 1.631 23.415 4 mm 7.489 0.117 5 mm -23.303 0.689 5014 1.542 56.833 6 mm -5.427 0.203 7 mm -4.854 0.794 _4531 1.514 57.200 8 mm -1.249 0.120 9 mm 2.124 0.437 1.590 30.867 10 mm 10.863 0.119 11 mm -7.848 0.355 1.590 30.867 12 mm 1.089 0.809 13 mm mm 0.2 -9 1.516 64.146 14 mm mm 0.208 mm mm mm

[0030] Table 2 Aspheric coefficients of wide-angle mobile phone lenses

[0031] mm 4 6 8 10 12 14 16 1 23.031 -9.532-002 -7.239-002 -4.518-002 -4.361-002 -3.591-001 1.121+000 -1.282+000 2 53.920 -5.381-002 -6.702-002 7.898-002 3.117-002 -4.625-001 8.326-001 -3.884-001 3 95.585 -1.179-001 4.701-003 -5.357-002 1.336-002 1.545-002 3.693-002 -1.931-002 4 -58.792 -2.591-002 -5.768-003 -1.039-002 2.330-003 4.816-003 -8.631-004 -8.240-004 5 98.849 1.106-002 1.310-003 2.357-004 1.056-004 4.676-004 1.388-004 -1.131-004 6 6.888 -4.292-002 -7.552-003 -5.251-004 1.234-003 4.980-004 1.741-004 3.298-005 7 -92.088 -5.285-002 6.191-003 9.445-004 -4.281-004 -2.159-004 -9.208-006 5.462-005 8 -0.857 3.493-002 4.538-003 2.112-004 -2.599-005 3.421-005 -1.595-006 6.364-007 9 -13.188 -2.282-002 -8.409-003 -1.146-003 8.223-005 5.894-005 1.177-005 -6.699-007 10 15.738 -2.306-002 -8.098-003 1.174-003 2.952-005 2.801-006 -1.961-006 5.781-007 11 8.587 1.074-002 1.523-003 -3.696-005 3.585-006 -3.044-006 -1.058-006 1.997-007 12 -5.531 -4.519-003 -1.447-003 2.905-004 -7.601-006 -1.131-006 1.626-007 -2.254-008

[0032] mm The wide-angle mobile phone lens of the present invention mm Curve graph, as can be seen from the figure, the central field of view mm At Nyquist frequency 223 lp / mmThe center field of view modulation transfer function is higher than 49%, the field of view modulation transfer function within 0.7 is higher than 33%, and the full field of view modulation transfer function is higher than 13%.446 lp / mm At 0.7, the field of view modulation transfer function in the sagittal direction mm is higher than 14%, and the meridional direction mm is higher than 3.5%.

[0033] mm The point diagram of the wide-angle mobile phone lens of the application at different fields of view is shown in the figure. mm The maximum radius is 3.192 mu m at 1 field of view, and the minimum mm radius is 0.779 mu m at 0 field of view, meeting the radius requirement. mm

[0034] mm The field curvature and distortion diagram of the wide-angle mobile phone lens of the application is shown in the figure. mm The maximum field curvature is less than 0.160 in the full field of view, the maximum distortion is -3.948%, meeting the design requirement, and the optical system has strong aberration correction ability.

[0035] mm The relative illumination diagram of the wide-angle mobile phone lens of the application is shown in the figure.

[0036] The application is based on the mature optical plastic aspheric lens processing and manufacturing technology, and a 1300 million pixel 6 P main camera lens is designed from 6 flat plastic plates. mm The design realizes a full field of view wide-angle of 84 degrees, a system focal length of 3.36 mm , and a total system length of 5.4 mm . The rear near-infrared filter 7 is used to cut off 750~1100 lp near-infrared light. At 1 / 2 cutoff frequency, the center field of view modulation transfer function is higher than 49%, the field of view modulation transfer function within 0.7 is higher than 33%, and the full field of view modulation transfer function is higher than 13%.446 mm / mm At 0.7, the field of view modulation transfer function in the sagittal direction mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm mm is greater than 14%, and the meridional direction is greater than 3.5%.

[0037] It should be noted that the above embodiments of the present application are illustrative, and not restrictive, of the present application, and therefore the present application is not limited to the above specific embodiments. Other embodiments of the present application, which are obtained by those skilled in the art under the teachings of the present application, without departing from the principles of the present application, are considered to be within the scope of the present application.

Claims

1. Wide-angle mobile phone lens, its characteristics are: The lens is composed of a biconvex positive lens (1), a first biconcave negative lens (2), a first concave-convex positive lens (3), a second concave-convex positive lens (4), a third concave-convex positive lens (5), a second biconcave negative lens (6) and a near-infrared filter (7) which are arranged in sequence from front to back; the biconvex positive lens (1), the first biconcave negative lens (2), the first concave-convex positive lens (3), the second concave-convex positive lens (4), the third concave-convex positive lens (5) and the second biconcave negative lens (6) are all plastic lenses; the near-infrared filter (7) is formed by glass coating; The biconvex positive lens (1) is a single lens with a front surface curvature radius of r 1 is 3.7 mm ≤ r 1≤4.5 mm , the radius of curvature of the rear surface r 2 is -6.7 mm ≤ r 2≤-5.8 mm , the center thickness of the front and rear surfaces d 1 is 0.35 mm ≤ d 1≤0.55 mm , D Refractive index under light n d1 1.4≤ n d1 ≤1.6, D Abbe number under light v d1 54≤ v d1 ≤58; The first biconcave negative lens (2) is a single lens, and the curvature radius of the front surface is r 3 is -12 mm ≤ r 3≤-10 mm , the radius of curvature of the rear surface r 4 for 6 mm ≤ r 4≤8 mm , the center thickness of the front and rear surfaces d 2 is 0.25 mm ≤ d 2≤0.6 mm , D Refractive index under light n d2 1.5≤ n d2 ≤1.7, D Abbe number under light v d2 21≤ v d2 ≤25; The first concave-convex positive lens (3) is a single lens, and the curvature radius of the front surface is r 5 is -24 mm ≤ r 5≤-20 mm , the radius of curvature of the rear surface r 6 is -7 mm ≤ r 6≤-4 mm , the center thickness of the front and rear surfaces d 3 is 0.45 mm ≤ d 3≤0.8 mm , D Refractive index under light n d3 1.4≤ n d3 ≤1.6, D Abbe number under light v d3 54≤ v d3 ≤58; The second concave-convex positive lens (4) is a single lens, and the curvature radius of the front surface is r 7 is -6.5 mm ≤ r 7≤-3.5 mm , the radius of curvature of the rear surface r 8 is -2 mm ≤ r 8≤-1 mm , the center thickness of the front and rear surfaces d 4 is 0.65 mm ≤ d 4≤0.9 mm , D Refractive index under light n d4 1.4≤ n d4 ≤1.6, D Abbe number under light v d4 54≤ v d4 ≤58; The third concave-convex positive lens (5) is a single lens, and the curvature radius of the front surface is r 9 to 2 mm ≤ r 9≤3 mm , the radius of curvature of the rear surface r 10 is 10 mm ≤ r 10 ≤11 mm , the center thickness of the front and rear surfaces d 5 is 0.35 mm ≤ d 5≤0.55 mm , D Refractive index under light n d5 1.4≤ n d5 ≤1.6, D Abbe number under light v d5 28≤ v d5 ≤32; The second biconcave negative lens (6) is a single lens with a front surface curvature radius of r 11 -9 mm ≤ r 11 ≤-6 mm , the radius of curvature of the rear surface r 12 1.0 mm ≤ r 12 ≤1.1 mm , the center thickness of the front and rear surfaces d 6 is 0.35 mm ≤ d 6≤0.55 mm , D Refractive index under light n d6 1.4≤ n d6 ≤1.6, D Abbe number under light v d6 29≤ v d6 ≤33.

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