High-resolution large-fov (field of view) zoom projection lens

Abstract

The invention relates to a high-resolution large-fov (field of view) zoom projection lens. An optical system lens group comprises a front compensation lens group, a variable-magnification lens group, a rear compensation lens group and a rear fixed lens group which are arrayed in sequence along the optical axis from a screen to an image plane DMD (digital micro-mirror device) chip; the variable-magnification lens group is the positive focal-length group component; the front compensation lens group and the rear compensation lens group are the negative focal-length group components; the rear fixed lens group is the positive focal-length group component; the front compensation lens group comprises three lenses; the variable-magnification lens group comprises two lenses; the rear compensation lens group comprises two lenses; the rear fixed lens group comprises six lenses; and the rear fixed lens group is provided with a diaphragm. The focal power of each lens group is distributed reasonably, and the high-resolution large-fov zoom projection lens has a compact structure, a large fov, a high resolution and a good image forming effect, can achieve a significant effect when being used for projecting images on a 2-4k DMD chip based large screen, adopts the materials being easy to process and is suitable for bath production.

Description

technical field [0001] The invention relates to a high-resolution large-field-of-view zoom projection lens, which is a large-field-of-view zoom projection lens suitable for use on a DLP projector with a high-resolution DMD chip, and is particularly suitable for use on a 4K high-resolution DMD chip. Large field of view zoom projection lens used on DLP projectors. Background technique [0002] In recent years, digital film is a technological revolution in the field of film technology. It is a brand-new model different from film films, and it presents the highest-quality images to the audience. With its strong advantages in production, distribution, and projection, it has developed rapidly in the industry. Therefore, there is a strong demand in the market for digital cinema projector systems and their supporting projection lenses. [0003] The digital cinema projector of prior art has mainly adopted two kinds of technical approaches: DLP ((Digital Light Processing, digital li...

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Problems solved by technology

[0005] In addition, in the existing disclosed projection lens technology, it is difficult to have a high image quality at 72lp / mm, and it cannot be better applied to the digital movie projection system based on the 4k DMD chip; spherical, but the image quality is still not good enough to guarantee a good projection effect in the digital cinema projection system based on 4k DMD chips; The shortcomings of the system materials are limited by the supply and demand of materials and the price of materials are high

High-resolution projection lenses require high image quality, uniform illumination, a certain zoom ratio, and long rear working distances, which bring difficulties to the design of projection lenses.

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