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Projection lens

A projection lens and lens technology, applied in the field of projection lenses, can solve the problem of inability to project a larger picture, and achieve the effects of fewer lenses, a large field of view, and good wide-angle characteristics.

Inactive Publication Date: 2010-06-09
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the miniaturized projection lens must have better wide-angle characteristics, otherwise it cannot project a larger picture in a short distance

Method used

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Experimental program
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Embodiment Construction

[0012] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0013] figure 1 Shown is the projection lens 100 provided by the embodiment of the present invention, which sequentially includes a first lens 10 with negative refractive power, a second lens 20 with positive refractive power, and a first lens 20 with negative refractive power from the magnification side to the reduction side. Three lens groups 30 and a fourth lens 40 with positive refractive power. The enlarged side refers to the side close to the projection screen (not shown), and the reduced side refers to the side close to the projection component 200 such as a digital micromirror device (Digital Micro mirror Device, DMD). The third lens group 30 further includes a positive lens 32 with positive refractive power and a negative lens 34 with negative refractive power from the magnification side to the reduction side. Preferably, the first lens 10 , the se...

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Abstract

The invention relates to a projection lens which sequentially comprises a first lens, a second lens, a third lens group and a fourth lens from an amplifying side to a shrinking side, wherein the first lens has negative focal power, the second lens has positive focal power, the third lens group has negative focal power, and the fourth lens has positive focal power. The projection lens meets the condition expression: 0.3 / f1 / f(2-4) / is more than 0.3 but less than 1.0, wherein f1 is the focal length of the first lens, and f(2-4) is the total focal length of lenses from the second lens to the fourth lens. The projection lens has less lens quantity and smaller total length of the lens. The projection lens has larger viewing angle, therefore, the projection lens has more favorable wide angle characteristics.

Description

technical field [0001] The invention relates to projection technology, in particular to a projection lens. Background technique [0002] In recent years, with the development of projection technology, projectors are gradually developing in the direction of miniaturization. Correspondingly, the projection lens also needs to be reduced in size. The total length of the projection lens generally depends on the number of optical lenses, so reducing the number of optical lenses is an important means to reduce the size of the projection lens. In addition, the miniaturized projection lens must have better wide-angle characteristics, otherwise it cannot project a larger picture in a short distance. Contents of the invention [0003] In view of this, it is necessary to provide a projection lens with small size and good wide-angle characteristics. [0004] A projection lens, which sequentially includes a first lens with a negative refractive power, a second lens with a positive re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B9/34G02B1/04G02B13/18
CPCG02B13/18G02B13/04
Inventor 王光儒黄俊翔
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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