Miniature large-target-surface imaging lens

Abstract

The utility model discloses a miniature large-target-surface imaging lens, comprising a main lens barrel, a first lens, a second lens, a third lens, a fourth lens and a fifth lens are sequentially arranged in the main lens barrel along the light incident direction, the outer diameters of the lenses are sequentially decreased, the third lens and the fourth lens are glued lenses, and all the lenses are made into glass spherical surfaces. According to the utility model, through reasonable focal power distribution and material selection, the miniature large-target-surface imaging lens is clear in imaging effect, the cost and weight of the lens are greatly reduced, and clear and bright images can be shot when the lens is installed on a primary imaging camera.

Description

Technical Field

[0001] The utility model relates to the technical field of lenses, in particular to a micro large-format imaging lens. Background Art

[0002] In recent years, with the improvement of the living standards of the public, the younger generation has shown great interest in instant imaging cameras that can take and develop photos immediately. Instant imaging cameras have the flexibility to frame in horizontal and vertical directions, and the picture can be automatically focused and exposed according to the target distance and brightness, which is very convenient. However, while pursuing miniaturization, there are further requirements for imaging quality and product yield. In view of the above requirements, it is of certain significance to research and develop a micro large-format imaging lens with the above advantages. Content of the Utility Model

[0003] Aiming at the deficiencies and defects of the prior art, a micro large-format imaging lens is provided. With this micro large-format imaging lens, high optical imaging quality can still be maintained while ensuring the small size of the lens and the product yield.

[0004] To achieve the above technical objectives, the technical solution adopted by the utility model is as follows:

[0005] A micro large-format imaging lens includes a main lens barrel. Along the direction of light incidence in the main lens barrel, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens are sequentially arranged, and the outer diameters of the lenses decrease in sequence. Among them, the third lens and the fourth lens are cemented lenses.

[0006] The outer surface of the first lens is an arc convex surface with a curvature radius of 13 mm, and the inner surface of the first lens is an arc concave surface with a curvature radius of 23.56 mm; the outer surface of the second lens is an arc concave surface with a curvature radius of -41.02 mm, and the inner surface of the second lens is an arc concave surface with a curvature radius of 76.14 mm; the outer surface of the third lens is an arc convex surface with a curvature radius of 157.54 mm, and the inner surface of the third lens is an arc concave surface with a curvature radius of 7.6 mm; the outer surface of the fourth lens is an arc convex surface with a curvature radius of 7.6 mm, and the inner surface of the fourth lens is an arc concave surface with a curvature radius of 9.51 mm; the outer surface of the fifth lens is an arc convex surface with a curvature radius of 14.87 mm, and the inner surface of the fifth lens is an arc convex surface with a curvature radius of -30.64 mm;

[0007] The air gap between the first lens and the second lens is 1.35 mm, the air gap between the second lens and the third lens is 0.21 mm, the air gap between the third lens and the fourth lens is 0 mm, and the air gap between the fourth lens and the fifth lens is 0.55 mm.

[0008] 1. Further, the outer diameter of the first lens is 15 mm, the outer diameter of the second lens is 14 mm, the outer diameter of the third lens is 13 mm, the outer diameter of the fourth lens is 10.5 mm, and the outer diameter of the fifth lens is 12 mm.

[0009] 2. Further, the central thickness of the first lens is 2.71 mm, the central thickness of the second lens is 0.69 mm, the central thickness of the third lens is 0.65 mm, the central thickness of the fourth lens is 2.08 mm, and the central thickness of the fifth lens is 3.8 mm.

[0010] 3. Further, the refractive index of the first lens is 1.8348, the refractive index of the second lens is 1.7847, the refractive index of the third lens is 1.6200, the refractive index of the fourth lens is 1.9108, and the refractive index of the fifth lens is 1.8040.

[0011] Further, the material of the first lens is H-ZLAF55D, the material of the second lens is H-ZF13, the material of the third lens is H-F4, the material of the fourth lens is H-ZLAF4LB, and the material of the fifth lens is H-ZLAF50E. All lenses are spherical glass lenses.

[0012] The beneficial effect of the present utility model is that, while ensuring a small lens size and a high product yield, high optical imaging quality can still be maintained. Description of the Drawings

[0013] Figure 1 is a schematic diagram of the optical path structure of the present utility model;

[0014] Figure 2 is a schematic cross-sectional view of the overall structure of the present utility model;

[0015] Figure 3 is a schematic diagram of the MTF performance of the present utility model;

[0016] Figure 4 is a schematic diagram of the OTF performance of the present utility model;

[0017] Figure 5 is a schematic diagram of the relative illumination performance of the present utility model;

[0018] Figure 6 It is a schematic diagram of the distortion performance of the present utility model;

[0019] Figure 7 It is a dot array schematic diagram of the present utility model;

[0020] Figure 8 It is a schematic diagram of the CRA curve of the present utility model.

[0021] In the figure: 1. The first lens; 2. The second lens; 3. The third lens; 4. The fourth lens; 5. The fifth lens; 6. The main barrel lens; 7. The light incident path; 8. The photosensitive element. Specific embodiments

[0022] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", "socketed", etc. should be understood in a broad sense. For example, it can be a connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0024] The following further describes the present utility model with reference to the drawings.

[0025] A micro large target surface imaging lens includes a main barrel. Inside the main barrel, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5 are sequentially arranged along the light incident direction, and the outer diameters of the lenses decrease in sequence.

[0026] The outer surface of the first lens 1 is a convex arc surface with a curvature radius of 13 mm, and the inner surface of the first lens 1 is a concave arc surface with a curvature radius of 23.56 mm; the outer surface of the second lens 2 is a concave arc surface with a curvature radius of -41.02 mm, and the inner surface of the second lens 2 is a concave arc surface with a curvature radius of 76.14 mm; the outer surface of the third lens 3 is a convex arc surface with a curvature radius of 157.54 mm, and the inner surface of the third lens 3 is a concave arc surface with a curvature radius of 7.6 mm; the outer surface of the fourth lens 4 is a convex arc surface with a curvature radius of 7.6 mm, and the inner surface of the fourth lens 4 is a concave arc surface with a curvature radius of 9.51 mm; the outer surface of the fifth lens 5 is a convex arc surface with a curvature radius of 14.87 mm, and the inner surface of the fifth lens 5 is a convex arc surface with a curvature radius of -30.64 mm;

[0027] The air gap between the first lens 1 and the second lens 2 is 1.35 mm, the air gap between the second lens 2 and the third lens 3 is 0.21 mm, the air gap between the third lens 3 and the fourth lens 4 is 0 mm, and the air gap between the fourth lens 4 and the fifth lens 5 is 0.55 mm.

[0028] 4. In this specific embodiment, the outer diameter of the first lens 1 is 15 mm, the outer diameter of the second lens 2 is 14 mm, the outer diameter of the third lens 3 is 13 mm, the outer diameter of the fourth lens 4 is 10.5 mm, and the outer diameter of the fifth lens 5 is 12 mm.

[0029] In this specific embodiment, the central thickness of the first lens 1 is 2.71 mm, the central thickness of the second lens 2 is 0.69 mm, the central thickness of the third lens 3 is 0.65 mm, the central thickness of the fourth lens 4 is 2.08 mm, and the central thickness of the fifth lens 5 is 3.8 mm.

[0030] 5. In this specific embodiment, the refractive index of the first lens 1 is 1.8348, the refractive index of the second lens 2 is 1.7847, the refractive index of the third lens 3 is 1.6200, the refractive index of the fourth lens 4 is 1.9108, and the refractive index of the fifth lens 5 is 1.8040.

[0031] In this specific embodiment, the material of the first lens 1 is H-ZLAF55D, the material of the second lens 2 is H-ZF13, the material of the third lens 3 is H-F4, the material of the fourth lens 4 is H-ZLAF4LB, and the material of the fifth lens 5 is H-ZLAF50E. All lenses are glass spherical surfaces.

[0032] In this specific embodiment, the specific parameters of the optical lens

[0033]

[0034] Among them, in this embodiment, the focal length f of the optical lens is 32 mm, and it can work at a working distance of more than 2 m; the aperture F / N0 is 2.8, the optical back focal length is 25.4 mm, and the distance from the outer surface of the first lens 1 to the central axis of the imaging surface is 37.6 mm.

[0035] The performance test curve of this specific embodiment is as Figures 4 - 6 , and it can be clearly seen from the data of multiple tests of this lens that the angle of the chief ray of the lens changes linearly, reaching a maximum of 35 degrees, the relative illumination is greater than 21%, the TV distortion is less than 2%, and it can provide images with high definition resolution. The working wavelength of the present invention is 420 - 680 nm.

[0036] While ensuring the small size of the lens and the product yield rate, it can still maintain high optical imaging quality.

[0037] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those of ordinary skill in the relevant technical field can also make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions also belong to the scope of the present invention, and the patent protection scope of the present invention should be defined by the claims.

Claims

1. A micro large target surface imaging lens, characterized in that, It includes a main lens barrel, and a first lens, a second lens, a third lens, a fourth lens and a fifth lens are sequentially arranged in the main lens barrel along the light incident direction, and the outer diameters of the lenses decrease in sequence; The outer surface of the first lens is an arc convex surface with a curvature radius of 13 mm, and the inner surface of the first lens is an arc concave surface with a curvature radius of 23.56 mm; the outer surface of the second lens is an arc concave surface with a curvature radius of -41.02 mm, and the inner surface of the second lens is an arc concave surface with a curvature radius of 76.14 mm; the outer surface of the third lens is an arc convex surface with a curvature radius of 157.54 mm, and the inner surface of the third lens is an arc concave surface with a curvature radius of 7.6 mm; the outer surface of the fourth lens is an arc convex surface with a curvature radius of 7.6 mm, and the inner surface of the fourth lens is an arc concave surface with a curvature radius of 9.51 mm; the outer surface of the fifth lens is an arc convex surface with a curvature radius of 14.87 mm, and the inner surface of the fifth lens is an arc convex surface with a curvature radius of -30.64 mm; The air gap between the first lens and the second lens is 1.35 mm, the air gap between the second lens and the third lens is 0.21 mm, the air gap between the third lens and the fourth lens is 0 mm, and the air gap between the fourth lens and the fifth lens is 0.55 mm; The main ray angle of the lens changes linearly, reaching a maximum of 35 degrees, the relative illumination is greater than 21%, and the TV distortion is less than 2%; The working wavelength is 420 - 680 nm.

2. The micro large target surface imaging lens according to claim 1, wherein The outer diameter of the first lens is 15 mm, the outer diameter of the second lens is 14 mm, the outer diameter of the third lens is 13 mm, the outer diameter of the fourth lens is 10.5 mm, and the outer diameter of the fifth lens is 12 mm.

3. The miniaturized large image plane imaging lens according to claim 2, wherein The central thickness of the first lens is 2.71 mm, the central thickness of the second lens is 0.69 mm, the central thickness of the third lens is 0.65 mm, the central thickness of the fourth lens is 2.08 mm, and the central thickness of the fifth lens is 3.8 mm.

4. The micro large-target imaging lens according to claim 2, wherein The refractive index of the first lens is 1.8348, the refractive index of the second lens is 1.7847, the refractive index of the third lens is 1.6200, the refractive index of the fourth lens is 1.9108, and the refractive index of the fifth lens is 1.8040.

5. A micro large-target imaging lens according to any one of claims 1-4, characterized in that, The material of the first lens is H-ZLAF55D, the material of the second lens is H-ZF13, the material of the third lens is H-F4, the material of the fourth lens is H-ZLAF4LB, and the material of the fifth lens is H-ZLAF50E. All lenses are spherical glass surfaces.

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