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Fixed focal lens

A fixed-focus lens and lens technology, applied in the field of projection lenses, can solve the problems of unsatisfactory compactness, adding optical systems, and difficult lens assembly, etc., and achieve the effect of high resolution, simple structure, and low cost

Inactive Publication Date: 2012-08-22
CORETRONIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the use of aspheric lenses may increase sensitivity to tolerances and make lens assembly difficult
Furthermore, increasing the number of lenses makes the entire optical system unable to meet the requirements of compactness.

Method used

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Embodiment Construction

[0011] The aforementioned and other technical content, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments in conjunction with the accompanying drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only referring to the directions of the drawings. Accordingly, the directional terms are used to illustrate and not to limit the invention.

[0012] figure 1 It is a schematic structural diagram of a fixed-focus lens according to an embodiment of the present invention. Please refer to figure 1 The fixed-focus lens 100 of this embodiment includes a first lens 112 , a second lens 121 , a third lens 122 , a fourth lens 124 , a fifth lens 125 , and a sixth lens 127 arranged in sequence from the enlargement side to the reduction side. In this embodiment, the fixed-focus lens 100 is, for example, a projection lens, and a display e...

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Abstract

The invention relates to a fixed focal lens which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from the amplification side to the zoom out side, wherein the diopters of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are sequentially negative, negative, positive, negative, positive and positive; and the fixed focal lens is in accordance with the condition that the absolute value of f3 / TT is more than 0.2 and less than 0.6, wherein the f3 is the effective focal length of the third lens, and the TT is the total length of the fixed focal lens.

Description

technical field [0001] The invention relates to a projection lens, and in particular to a fixed-focus projection lens. Background technique [0002] With the advancement of optoelectronic technology, projection lenses with high brightness and low price have always been the market trend. A lens with high brightness means that it has a smaller f-number (f number), and the f-number of a high-brightness lens is usually 2.4. However, in order to obtain a higher luminous flux, in addition to using a high-power light source (such as a high-wattage light-emitting diode or a high-pressure mercury lamp), using a large aperture lens is another effective method. However, when the aperture becomes larger, it also means that the lens is relatively larger, and the subsequent aberrations will increase sharply, and the difficulty of optical design will also increase significantly. [0003] Therefore, many existing technologies either use aspheric lenses to correct aberrations, or increase ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B3/00
Inventor 廖陈成
Owner CORETRONIC
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