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Low-cost ultra-short-focus projection lens

A projection lens and ultra-short-focus technology, applied in the field of projection lenses, can solve the problems of high lens start-up cost, high project start-up risk, and decreased positioning accuracy, and achieve the effects of reduced design difficulty, long axial length, and stable focusing

Inactive Publication Date: 2021-08-27
黄国豹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common way to achieve short-distance and large-format projection effects is mainly to use a catadioptric lens combined with a refracting lens and a reflector. This catadioptric lens is easy to achieve a large format, but the disadvantage is that it contains more aspheric lenses. , high lens start-up cost, tolerance sensitive
[0003] Patent CN107490844A is a better lens structure, but it uses 3 aspheric lenses, the cost of mold opening is high, and the risk of project start-up is high
The focus group is close to the reflector group. In order to avoid blocking the light, edge trimming is required, resulting in a decrease in positioning accuracy during the focusing process.

Method used

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  • Low-cost ultra-short-focus projection lens
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  • Low-cost ultra-short-focus projection lens

Examples

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Embodiment Construction

[0030] Attached below Figure 1-4 The specific implementation manner of the present invention will be described in further detail.

[0031] The invention proposed by this application will be fully understood by the following specific examples, so that those skilled in the art can complete it. However, the embodiments of the application cannot be limited by the following examples. Those who are familiar with the art People can deduce other embodiments according to the spirit of the disclosed embodiments, and these embodiments should all belong to the scope of the present invention. For example, dismantling the cemented surface of a cemented lens and replacing it with a thin air gap, and keeping the outline and shape of the single lens similar, should be regarded as an appropriate extension of the patent of the present invention and within the scope of protection of this patent.

[0032] refer to figure 1 , which is a structural schematic diagram of the ultra-short-focus proje...

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Abstract

The invention provides a low-cost ultra-short-focus projection lens, which comprises a refractor group and a reflector group, wherein the refractor group comprises a first lens group and a second lens group which only comprise spherical lenses, and a third lens group which at least comprises an aspherical lens. The low-cost ultra-short-focus projection lens has the advantages of few aspherical lenses and low cost.

Description

technical field [0001] The invention relates to a projection lens, in particular to a low-cost ultra-short-focus projection lens. Background technique [0002] In recent years, with the rise of interactive entertainment and home theater, ultra-short-focus lenses with short projection distances are favored by the market. At present, the common way to achieve short-distance and large-format projection effects is mainly to use a catadioptric lens combined with a refracting lens and a reflector. This catadioptric lens is easy to achieve a large format, but the disadvantage is that it contains more aspheric lenses. , the lens has high start-up costs and is sensitive to tolerances. [0003] Patent CN107490844A is a better lens structure, but it uses 3 aspherical lenses, the cost of mold opening is high, and the risk of project start-up is high. The focusing group is close to the reflector group. In order to avoid blocking the light, edge trimming is required, resulting in a decr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B13/16G02B13/18G02B13/24G03B21/14
CPCG02B13/0045G02B13/006G02B13/0065G02B13/16G02B13/18G02B13/24G03B21/14
Inventor 黄国豹
Owner 黄国豹
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