Projection system

A projection system and image technology, applied in the field of projection systems, can solve the problems of small field of view, large field of view, inability to guarantee the quality of projection imaging, and achieve the effect of taking into account the quality of projection imaging
CN110737069AActive Publication Date: 2020-01-31SUN YANG OPTICS DEV CO LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SUN YANG OPTICS DEV CO LTD
Publication Date
2020-01-31

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Abstract

A projection system comprises the following parts of a telephoto lens capable of independent imaging with a focal length of 70mm to 300mm; a short focus lens capable of independent imaging with a focal length of 3mm to 8mm, wherein the short focus lens is provided with an optical axis with the telephoto lens; and at least one reflective element that changes the direction of the optical axis; thereby, when the telephoto lens forms an image, the short focus lens forms an image to a predetermined position.
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Description

technical field

[0001] The present invention relates to a projection system, especially a kind of cooperation between a short-focus lens and a long-focus lens, so that the projection system can perform ultra-short-focus projection to a screen. Background technique

[0002] Projectors are constantly innovating with the advancement of technology. From general focal length projectors to short focal length projectors, it also shows the value of projectors in the market. Its applications are extensive, including multimedia information presentation systems, projection TVs, and home theaters. However, in recent years, the short-throw projector market has been used in the education market and the promotion of modern small-sized families.

[0003] Second, in order to project the imaging quality of the projection lens, the longer the focal length of the projection lens is, the smaller the angle of view will be. On the contrary, the shorter the focal length of the projection lens will ...

Claims

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