Aspheric ultra-short throwing projection lens

Abstract

The invention provides an aspheric ultra-short throwing projection lens. The aspheric ultra-short throwing projection lens comprises a plurality of coaxial lenses positioned between a projection surface and a DMD chip, a front lens group for deflecting wide-angle light into a paraxial light beam, and a rear lens group for telecentric imaging of the paraxial light beam on the DMD chip.

Description

technical field [0001] The invention relates to the field of photoelectric display, in particular to the field of projection equipment, in particular to an aspheric ultra-short-focus projection lens. Background technique [0002] At present, ordinary projectors are only equipped with standard lenses. If such a projector wants to project a picture of 152.4cm, the projector needs to be placed at a distance of 2.2m, and for 203.2cm, it must be at a distance of 2.6m. The picture should reach 3m to 4m away. If the space for projection is not large, but a larger image needs to be displayed, especially in a small conference room, this lens cannot meet the demand. Moreover, if the speaker inadvertently blocks the light from time to time, the audience watching will be greatly affected. Considering these factors, in recent years, some people have invented short-focus lenses, which have improved the high requirements for projection distance, but the image quality cannot be guaranteed...

AI Technical Summary

Problems solved by technology

Traditional projection lenses with long focal lengths and narrow viewing angles are difficult to meet the needs in terms of size and projection picture quality

At the same time, because the generally designed lens does not achieve strict image telecentricity, it causes a relatively serious phenomenon of uneven illumination on the projection surface

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