Projector

A projection device and projection lens technology, applied in optical components, optics, instruments, etc., can solve problems such as high cost, improve imaging quality, reduce the number of lenses, and meet the advantages of price and mass production.

Active Publication Date: 2014-10-01
QISDA OPTRONICS (SUZHOU) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional projection lenses use secondary imaging technology to achieve short-focus effects, but they are expensive. Therefore, how to design a low-cost short-focus projection lens with mass production advantages is one of the development goals of the related optical lens industry.

Method used

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Embodiment Construction

[0028] In order to have a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed descriptions are provided in conjunction with the embodiments.

[0029] see figure 1 , figure 1 is a schematic diagram of a projection device 10 according to an embodiment of the present invention. The projection device 10 is used for projecting images onto a screen 12 . The projection device 10 includes a light source 14 , an imaging unit 16 , a projection lens 18 , a filter unit 20 and a reflective element 22 . The light source 14 outputs light, the filter unit 20 receives the light and filters the light into multiple colored lights, and the light processed by the filter unit 20 is reflected by the reflective element 22 and received by the imaging unit 16 . The imaging unit 16 receives multiple colored lights from the reflective element 22 and transmits them to the projection lens 18 . The projection lens 18 is disposed betwe...

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Abstract

The invention provides a projector which is used for projecting an image onto a screen. The projector comprises a light source used for providing light, an imaging unit used for receiving the light, and a projection lens arranged between the imaging unit and the screen to project the light onto the screen, wherein the projection lens comprises a first lens assembly and a second lens assembly, the first lens assembly is close to the screen and comprises a first lens, a second lens and a third lens, the first lens, the second lens and the third lens all have negative diopters, the first lens is an aspherical lens close to the screen, the second lens is located between the first lens and the third lens, the second lens assembly has a positive diopter and is close to the imaging unit, the effective focal distance of the projection lens is f, the focal distance of the first lens assembly is f[G1], the focal distance of the first lens is f[L1], the focal distance of the second lens is f[L2], the focal distance of the third lens is f[L3], 0.75<= / f[G1] / / f<=1.28, and the relationship between f[L1], f[L2] and f[L3] meets the inequation as described in the specification.

Description

technical field [0001] The invention provides a projection device, especially a projection device with a short-focus projection lens. Background technique [0002] With the advancement of technology, projectors are often used to display video data in conference presentations. In order to match the size of the meeting room, the ultra-short-throw projection lens has gradually become the mainstream of the market due to its advantages of portability and convenient focusing. Traditional projection lenses use secondary imaging technology to achieve short-focus effects, but they are expensive. Therefore, how to design a low-cost short-focus projection lens with mass production advantages is one of the development goals of the related optical lens industry. . Contents of the invention [0003] The present invention provides a projection device with a short-focus projection lens to solve the above problems. [0004] In one aspect, the present invention provides a projection devi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/18G02B13/00
CPCG02B13/0045G02B13/18
Inventor 林明坤
Owner QISDA OPTRONICS (SUZHOU) CO LTD
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