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a wide-angle lens

A wide-angle lens and lens technology, applied in the field of optical lenses, can solve the problems of not being able to meet the strict requirements of CRA, high cost, complex structure, etc., and achieve the effects of good chromatic aberration, field curvature correction, and small lateral chromatic aberration

Active Publication Date: 2018-12-11
GOERTEK OPTICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a wide-angle lens to solve the problem of complex structure and high cost caused by all adopting aspherical lenses, and solve the problem that the overall shape of the system is large due to the use of all spherical lenses, and it is impossible to strictly require the CRA of each field of view

Method used

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Examples

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Effect test

Embodiment 1

[0023] figure 1 It is a structural principle diagram of a wide-angle lens according to an embodiment of the present invention, figure 2 It is a structural schematic diagram of a wide-angle lens according to an embodiment of the present invention, see figure 1 with figure 2 , the wide-angle lens includes: the first lens L1, the second lens L2, the third lens L3, the diaphragm L0, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 arranged in sequence along the light incident direction ;

[0024] The first lens L1 is a spherical negative lens with both surfaces convex toward the object side;

[0025] The second lens L2 is a spherical positive lens with both surfaces convex toward the object side;

[0026] The third lens L3 is a spherical positive lens with both surfaces convex toward the object side;

[0027] The fourth lens L4 is a spherical positive lens with both surfaces convex toward the image side;

[0028] The fifth lens L5 and the si...

Embodiment 2

[0032] In this embodiment, the explanation is focused on the relational expressions satisfied by the refractive index Nd and the Abbe number Vd of each lens of the wide-angle lens. For other contents, refer to other embodiments of the present invention. In the wide-angle lens of the present invention, the refractive index Nd and the Abbe number Vd of each lens respectively satisfy the following relational expressions.

[0033] The refractive index Nd1 and the Abbe number Vd1 of the first lens L1 satisfy the following relational expressions respectively:

[0034] 1.5

[0035] The refractive index Nd2 and the Abbe number Vd2 of the second lens L2 satisfy the following relational expressions respectively:

[0036] 1.64

[0037] The refractive index Nd3 and the Abbe number Vd3 of the third lens L3 satisfy the following relational expressions respectively:

[0038] 1.6

[0039] The refractive index Nd4 and the Abbe nu...

Embodiment 3

[0050] In this embodiment, the description focuses on the surface shapes of the two surfaces of the sixth lens L6 of the wide-angle lens. For other content, refer to other embodiments of the present invention. In the wide-angle lens of the present invention, the surface of the sixth lens L6 close to the seventh lens L7 is spherical.

[0051]In this way, in the wide-angle lens system of the present invention, only the two surfaces of the seventh lens L7 are aspherical, and the CRA of any field of view can be strictly controlled within a certain range, and the tolerance range is ±0.2°, for example, θ is the maximum For the CRA of the field of view, when the full field of view is 29.8°, through the last aspherical surface, that is, the surface of the seventh lens L7 close to the image side, the CRA can be precisely controlled within the range of 29.8±3° without affecting the MTF (modulation transfer function), and it can also increase the MTF value by controlling field curvature....

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Abstract

The present invention discloses a wide-angle camera lens. The camera lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged in a light incoming direction; the first lens is a spherical negative lens of which the two surfaces both protrude towards an object side; the second lens and the third lens are both a spherical positive lens of which the two surfaces protrude both towards the object side; the fourth lens is a spherical positive lens of which the two surfaces both protrude towards an image side; the fifth lens and the sixth lens form a cemented positive lens; the fifth lens is a spherical mirror; a surface of the sixth lens, which is adjacent to the fifth lens, is a spherical surface; and the seventh lens is an aspherical lens. With the wide-angle camera lens provided by the technical schemes of the present invention adopted, the complexity of a camera lens which is composed of pure aspherical lens structures can be avoided, a CRA (chief ray angle) can be strictly controlled, and off-axis aberration and field aberration can be effectively corrected. The wide-angle camera lens has the advantages of compact structure, low cost and clear imaging, and is suitable for imaging and projection.

Description

technical field [0001] The invention relates to the technical field of optical lenses, in particular to a wide-angle lens. Background technique [0002] At present, micro wide-angle lenses are widely used to take photos of larger scenes, such as buildings and landscapes, because of their wide viewing angles and deep depth of field. [0003] Existing miniature wide-angle lenses generally use aspheric lenses or all spherical lenses. The problem of using all aspheric lenses is that the structure is complex and the cost is high. The CRA (Chief Ray Angle, main light angle) has strict requirements, which leads to the relaxation of the CRA requirements. Contents of the invention [0004] The invention provides a wide-angle lens to solve the problem of complex structure and high cost caused by all adopting aspheric lenses, and solves the problem that the overall shape of the system is large due to adopting all spherical lenses, and the CRA of each field of view cannot be strictly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/06G02B13/18G02B13/00
CPCG02B13/0045G02B13/06G02B13/18
Inventor 张国军杨春
Owner GOERTEK OPTICAL TECH CO LTD
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