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Optical imaging system and projection system

An optical imaging system and light valve technology, applied in the field of projection display, can solve the problems of reducing the production efficiency of ultra-short-focus projection lenses, difficult to reach a very good level of image quality, and increasing costs.

Active Publication Date: 2019-01-04
QINGDAO HISENSE LASER DISPLAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These measures not only reduce the production efficiency of the ultra-short-throw projection lens and increase the cost, but also the image quality on the final screen is difficult to reach a very good level

Method used

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  • Optical imaging system and projection system
  • Optical imaging system and projection system
  • Optical imaging system and projection system

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Embodiment Construction

[0012] Typical embodiments that embody the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention is capable of various changes in different embodiments without departing from the scope of the present invention, and that the description and illustrations therein are illustrative in nature and not limiting. this invention.

[0013] The invention provides an optical imaging system and a projection system. Specifically, in this application, the projection system is described by taking an ultra-short-focus projection system as an example, and the optical imaging system is described by taking an optical imaging system of an ultra-short-focus projection system as an example.

[0014] see figure 1 , the ultra-short-focus projection system 1 includes an optical imaging system and a light source, and the light source is used to emit an illumination beam.

[0015] The optical imagin...

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Abstract

The invention provides an optical imaging system and a projection system. The optical imaging system comprises a lighting mirror set, a DMD light valve and a projection lens. The lighting mirror set is used to compress the divergence angle of a lighting light beam, so that the lighting light beam is projected onto the target surface of the DMD light valve. The divergence angle of the lighting light beam is less than or equal to 20 degrees. The projection lens receives the light beam reflected by the DMD light valve, and shoots the imaged light beam. According to the optical imaging system and the projection system, the F number of the projection lens can be increased; the design complexity of the projection lens can be reduced; the manufacture difficulty of the projection lens can be reduced; and the image quality on a screen can be improved.

Description

technical field [0001] The invention relates to the field of projection display, in particular to an optical imaging system and a projection system. Background technique [0002] Projection display technology has been widely used in many fields such as home, business, education, and engineering. In order to shorten the distance between the projector and the screen, ultra-short throw projectors have appeared on the market. The feature of the ultra-short-throw projector is that it adopts an optical projection lens with a very short focal length to achieve a small throw ratio. In order to achieve a smaller projection ratio, the general practice is to add a reflector between the projection lens and the screen to compress the length of the optical path so that the lens can be closer to the screen. [0003] However, as the projection ratio of ultra-short-throw projectors decreases, the field of view angle of the optical projection lens group continues to increase. When the dive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B21/20
CPCG03B21/2066G03B21/208
Inventor 朱瑞
Owner QINGDAO HISENSE LASER DISPLAY CO LTD