Desktop ultra-short-focus optical module

Abstract

The invention discloses a desktop ultra-short-focus optical module, which belongs to the field of optical systems. The desktop ultra-short-focus optical module is used for imaging a first image projected and displayed by a projector ray machine into an amplified second image, and comprises the projector ray machine, a condensing lens, an aspherical lens, a free curved-surface lens and a free curved-surface reflector which are arranged along an optical path in a tandem manner, wherein the free curved-surface lens is composed of a convex lens and a concavo-vonvex lens. The desktop ultra-short-focus optical module provided by the invention corrects spherical aberration in a collimation and focusing system caused by the condensing lens through the aspherical lens, increases the optical path through the free curved-surface reflector and achieves short-focus projection. Moreover, the desktop ultra-short-focus optical module greatly shortens the projection distance through the ultra-short-focus technology, the projection ratio of the desktop ultra-short-focus optical module ranges from 0.1 to 0.18, and the offset of the first image relative to a main optical axis is greater than 120%.

Description

technical field [0001] The invention belongs to the field of optical systems, in particular to a desktop ultra-short-focus optical module. Background technique [0002] The ultra-short-focus optical module can effectively shorten the projection distance of the projector, and it is an important solution for projecting large-size images at short distances on the market. [0003] There are three ways to shorten the focal length of the projection lens: refraction, reflection and hybrid. Refractive design lenses are all composed of lenses, including spherical lenses or aspheric lenses. Because the lens of this design has a large number of lens lenses and various types, the structure is often complicated, which is not conducive to manufacturing. Reflective lenses are all composed of reflectors, including spherical or aspheric reflectors. The reflectors can be convex, concave or plane reflectors, but the processing and detection of aspheric reflectors are more difficult. The mirr...

AI Technical Summary

Problems solved by technology

A lens or system based on the hybrid design principle of first refraction and then reflection, but due to the need to project a large-scale picture within a short distance, a low projection ratio is required, so that the projected image will have spherical aberration, etc., depth of field and the brightness of the image plane are difficult to control, and the resulting image quality is not high

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