Ultra-short-focus object lens for table top projection

Abstract

The invention discloses an ultra-short-focus object lens for table top projection. The ultra-short-focus object lens comprises a display chip used for displaying a to-be-projected object plane, a refraction lens group and a reflecting mirror group; the refraction lens group is arranged on an imaging optical path of a display chip, comprises multiple spherical lenses and aspherical lenses which arelocated on the same primary optical axis, and is used for balancing an aberration formed by projection object plane light rays passing through the refraction lens group; the refraction lens group isused for reducing the field curvature and distortion which are caused by the refraction lens group, imaging beams emitted by the refraction lens group are reflected, and an image is imaged on a tabletop. Accordingly, by means of cooperation of the multiple spherical lenses and the two aspherical lenses, the aberration formed by the projection object plane light rays passing through the refractionlens group is balanced; the field curvature and distortion are reduced through the refraction lens group, the light rays are reflected, and short-distance and high-quality large image projection is achieved.

Description

technical field [0001] The invention relates to projection technology in the photoelectric display industry, in particular to an ultra-short-focus projection lens system for imaging display. Background technique [0002] With the rapid development of semiconductor technology, digital light processing (DLP) projectors, liquid crystal display (LCD) projectors, silicon crystal (LCoS) projectors and other projection instruments are developing in the direction of miniaturization while improving pixels. To meet consumers' requirements for projection picture quality and portability. Ultra-short-throw projection technology has attracted widespread attention in the short-throw projection market due to its advantages of being able to project large images within a short distance and improving space utilization. [0003] Ultra-short-throw projection lenses currently on the market include three types: reflection, refraction, and hybrid. Since the projection lens mainly uses a refractiv...

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Problems solved by technology

[0004] Some ultra-short-throw projection lenses currently on the market have given up the aspheric lens and doublet lens structure in order to reduce production costs and assembly difficulties, but this has also caused some defects. On the one hand, the number of spherical lenses used has increased. It reduces the convenience of the system; on the other hand, it also increases the aberration of the system, and the imaging quality is relatively poor

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