Image space telecentric projection camera lens

Abstract

The invention discloses an image space telecentric projection camera lens, which comprises an optical system lens group, wherein the optical system lens group consists of a diverging lens [L1], a converging lens [L2] and an aberration correction group [U] which are arrayed in sequence from a screen side to an image plane side along an optical axis; and the aberration correction group [U] consistsof a first plus lens [L3], a first minus lens [L4], a second plus lens [L5], a second minus lens [L6], a third plus lens [L73] and a fourth plus lens [L8]. Compared with the prior art, the image space telecentric projection camera lens has the characteristic of realizing satisfactory image quality on an image surface with a relatively long post-working distance and is applied to a liquid crystal display (LCD), a liquid crystal on silicon (LCOS), a digital light processor and the like with an image space telecentric optical path system; and the lenses of the whole system are spherical glass lenses, and the image space telecentric projection camera lens has high process performance, low material cost and a simple structure and meets requirements for mass production.

Description

technical field [0001] The invention belongs to the technical field of digital projectors, and in particular relates to a digital projector with telecentric optical path system such as LCD, LCOS and DLP, etc. Heart fixed focus projection lens. Background technique [0002] With the development and deepening of semiconductor technology, digital projection display technology has been developed, and the projection display industry based on DLP, LCOS, LCD and other technologies has developed rapidly. In recent years, especially DLP projection display technology has developed rapidly with its rich colors, high-definition images, high-brightness images and high-contrast displays. It can achieve smaller and lighter product features, especially In the field of digital projection in cinemas, its advantages are unparalleled. The core component of DLP technology mainly adopts DMD digital image chip. DMD is a digital image chip exclusively mastered and developed by Texas Instruments. ...

AI Technical Summary

Problems solved by technology

[0004] In addition, since DLP, LCOS or LCD systems all use TIR or PBS prisms to achieve effective illumination, the projection lens needs to retain a long rear working distance when matching it, which greatly increases the length of the lens and the off-axis image. poor control difficulty

In some existing disclosed projection lens technologies, a part of the application of aspheric technology, that is, by adding an aspheric lens to the optical system of the projection lens to improve the imaging quality of the system or simplify the system structure, but the application of the aspheric lens has no The processing and assembly requirements are strict, which is not conducive to the improvement of production efficiency and the reduction of cost. In the technology that does not use aspheric lenses, in order to achieve better optical performance, the technical measure is generally to increase the number of lenses, generally 10 pieces The above, or high-grade optical materials with high refractive index imported from abroad, such as FCD1, which can significantly improve the aberration, are expensive, poor in workmanship, and low in processing efficiency and yield.

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