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Zooming projection lens

A projection lens and projection display technology, applied in the field of zoom projection lenses, can solve problems such as relationship revealing, and achieve the effects of improving projection quality, reducing costs, and high yield.

Inactive Publication Date: 2009-02-18
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this patent only provides the conditional relationship between the first lens group and some lenses in the second lens group, and does not disclose the relationship between the movable third lens group and other lens groups. The movement of the three lens groups will directly affect the projection quality of the zoom projection lens

Method used

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Experimental program
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Embodiment Construction

[0022] Please refer to Figure 1A and Figure 1B , which respectively show the schematic diagram of the positional relationship of each lens group when the zoom projection lens 1 of the present invention is located at the zoom end (wide) and the zoom end (tele). The zoom projection lens 1 of the present invention can be applied to the front projection type A projection display device, such as a DLP (Digital Light Processing) projector, is used to project the original image on the DMD imager to the screen to form a projected image, wherein the DMD imager is used as the image source side of the zoom projection lens 1 (ie, the object face), such as Figure 1A The right side shown in , and the screen is used as the imaging side (i.e. image plane) of the zoom projection lens 1, as Figure 1A shown on the left.

[0023] The zoom projection lens 1 of the present invention is used to project an original image on the image source side to the imaging side to form a projected image. Coun...

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Abstract

The invention discloses a zoom projection lens, which is used to make original image which is at image source side project on image side to form projective image, a projective system of the zoom projection lens sequentially comprises a first lens group with negative diopter, a second lens group with positive diopter, a third lens group with positive diopter and a fourth lens group with negative diopter and a fifth lens group with positive diopter from the imaging side. When the zoom projection lens changes from the amplifying end to the shrinking end, the first lens group and the fifth lens group are firmly fixed, and the second lens group, the third lens group and the fourth lens group all move towards the imaging side; the zoom projection lens can meet special condition so as to improve the projection quality. The zoom projection lens also comprises an automatic light ring which can move along with the fourth lens group together.

Description

【Technical field】 [0001] The invention relates to a zoom projection lens, in particular to a zoom projection lens applicable to the projection display optical system of a projection device and the image capture optical system of an image capture device. 【Background technique】 [0002] In recent years, projectors have been widely used in daily life, especially recently, they have been further used in small video devices, such as laptop computers, desktop computers, etc., to meet the usage requirements in specific environments. A common projector uses a DMD (Digital Micro-mirror Device) as a light valve imager. The imaging principle is to control the reflection direction of light by the rotation (±10°) of the DMD micro-mirror device. In this way, the point can be controlled. The signal is turned on and off, and then the image on the DMD micromirror device is projected onto the screen through the optical lens. [0003] The type of projection lens will determine the quality of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177G02B15/16G02B9/60G02B1/02
Inventor 郭仲渊
Owner ASIA OPTICAL CO INC
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