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fixed focus lens

A fixed-focus lens and lens technology, applied in the field of fixed-focus lenses, can solve problems such as rising lens costs, achieve high-quality resolution, reduce tolerance loss, and facilitate assembly

Active Publication Date: 2021-04-06
JIANGXI LIANCHUANG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Generally speaking, the better the imaging quality and the higher the resolution of the lens, the more lenses are used, because more lenses are conducive to correcting aberrations and improving resolution, but the cost of the lens also increases, so it is necessary to design a cost low shot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see figure 1, which shows a fixed-focus lens provided by the embodiment of the present application, the fixed-focus lens includes in order from the object side to the imaging surface: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, Fifth lens L5, sixth lens L6, and seventh lens L7.

[0048] The first lens L1 has a negative focal length and is a meniscus spherical lens whose concave surface faces the imaging surface. The second lens L2 has a negative focal length and is a biconcave spherical lens. The third lens L3 has a positive focal length and is a biconvex spherical lens. The fourth lens L4 has a positive focal length and is a biconvex spherical lens or a biconvex aspheric lens. The fifth lens L5 has a positive focal length and is a biconvex spherical lens. The sixth lens L6 has a negative focal length and is a biconcave spherical lens. The seventh lens L7 has a positive focal length and is a biconvex aspherical lens or a biconvex spherical...

Embodiment 2

[0090] see Figure 5 , is a schematic diagram of the cross-sectional structure of the fixed-focus lens in the second embodiment of the present invention. The fixed-focus lens in this embodiment is roughly the same as that in the first embodiment. The difference is that in this embodiment The fixed focal length lens stop 1 is disposed between the third lens L3 and the fourth lens L4 instead of between the fourth lens L4 and the fifth lens L5 in the first embodiment. Moreover, the fourth lens L4 is a biconvex spherical lens, and the seventh lens L7 is a biconvex aspheric lens.

[0091] At the same time, the relevant parameters of each lens of the fixed-focus lens in this implementation are different from the relevant parameters of each lens of the fixed-focus lens in the first embodiment.

[0092] Please refer to Table 3, which shows the relevant parameters of each lens of the fixed-focus lens in this embodiment.

[0093] table 3

[0094]

[0095] Please refer to Table 4, ...

Embodiment 3

[0100] see Figure 9 , which is a schematic cross-sectional view of the fixed-focus lens in the third embodiment of the present invention. The fixed-focus lens in this embodiment is roughly the same as that in the first embodiment, except that the position of the aspheric surface is different. Similarly, the fourth lens L4 of the fixed-focus lens in this embodiment is an aspheric lens, while the seventh lens L7 of the first embodiment is an aspheric lens, that is to say, the fourth lens L4 is a biconvex aspheric lens, The seventh lens L7 is a biconvex spherical lens, and the diaphragm 1 is disposed between the fourth lens L4 and the fifth lens L5.

[0101] At the same time, the relevant parameters of each lens of the fixed-focus lens in this implementation are different from the relevant parameters of each lens of the fixed-focus lens in the first embodiment.

[0102] Please refer to Table 5, which shows the relevant parameters of each lens of the fixed-focus lens in this emb...

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Abstract

The application discloses a fixed-focus lens, which relates to the lens field. From the object side to the imaging surface, the lens includes: a first lens with a negative focal length, the first lens is a meniscus spherical lens with a concave surface facing the imaging surface; a second lens with a negative focal length, and the second lens is a biconcave spherical surface Glasses; the third lens with positive focal length, the third lens is a biconvex spherical lens; the fourth lens with positive focal length, the fourth lens is a biconvex spherical lens; the fifth lens with positive focal length, the fifth lens is Bi-convex spherical lens; the sixth lens with negative focal length, the sixth lens is a bi-concave spherical lens; the seventh lens with positive focal length, the seventh lens is a bi-convex aspheric lens; the second lens and the third lens pass through Optical glue bonding, the fifth lens and the sixth lens are bonded through optical glue. Through two groups of cemented lenses, the fixed-focus lens is small in size, light in weight, requires very low processing accuracy, is easy to assemble, and can guarantee high-quality resolution.

Description

technical field [0001] The present application relates to the lens field, and more specifically, to a fixed-focus lens. Background technique [0002] Generally speaking, the better the imaging quality and the higher the resolution of the lens, the more lenses are used, because more lenses are conducive to correcting aberrations and improving resolution, but the cost of the lens also increases, so it is necessary to design a cost low shot. Contents of the invention [0003] The present application proposes a fixed-focus lens to improve the above defects. [0004] In the first aspect, the embodiment of the present application provides a fixed-focus lens, which sequentially includes from the object side to the imaging surface: a first lens with a negative focal length, and the first lens is a meniscus with a concave surface facing the imaging surface A spherical lens; a second lens with a negative focal length, the second lens is a biconcave spherical lens; a third lens wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/00G02B13/18G02B7/02G03B30/00
CPCG02B13/0045G02B7/025G02B9/64B60R11/04
Inventor 高博李伟娜黄健新韩建
Owner JIANGXI LIANCHUANG ELECTRONICS CO LTD
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