Short-focus high-definition projection lens structure

Abstract

The invention discloses a short-focus high-definition projection lens structure which is characterized by comprising thirteen lenses which are arranged in sequence and are divided into front and rear two groups, wherein for the front group, a first meniscus-shaped lens, a second meniscus-shaped lens, a third single concave lens, a fourth biconcave spherical lens, a fifth biconvex lens, and sixth and seventh bonding lenses; and for the rear group, a first biconvex lens, a second meniscus-shaped lens, third and fourth bonding lenses, a fifth planoconvex lens, and a sixth biconvex lens. The short-focus high-definition projection lens structure is formed by combining spherical lenses, is low in machining cost and is applicable to batch production, the glass grinding machining is convenient, aluminum-made structure pieces are adopted in the structure, and the focusing mode refers to that the lenses in the front group are adjusted, so that the problem of movement difficulty caused by the large whole lens weight in whole group focusing (both the front and rear groups) is avoided.

Description

technical field [0001] The invention relates to a projection objective lens for a front projection projector. Background technique [0002] According to the classification of image display devices, the current image display technology of front projection projectors is mainly divided into three technical fields: 3LCD, DLP, and LCOS. 3LCD projector lenses generally adopt telecentric optical design, which can be realized in two ways: the first one is composed of about ten pieces of various spherical lenses. The characteristics are: the projection distance is long, and the projection is about 70 inches at about 3M; due to the use of spherical lenses, it can be processed by ordinary glass grinding. The second is to change at least 2~3 spherical lenses into plastic aspheric lenses on the basis of the first one; the feature is that the projection distance can be shortened, so that the same projection distance can be projected when the projection distance is about 1M. 70-inch scre...

AI Technical Summary

Problems solved by technology

Since the second type of lens adopts plastic molding method, the control of the aspheric surface becomes a difficult point, so the processing of a higher resolution lens is difficult, the development cycle is long, and the cost is extremely high

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