Ultra-short-focal projection objective lens

Abstract

The invention relates to an ultra-short-focal projection objective lens. The ultra-short-focal projection objective lens includes a lens group with positive focal power, a reflector with negative focal power, and a display chip; the lens group includes a first sub lens group, a diaphragm and a second sub lens group; and light reflected by the display chip passes through the lens group, and is reflected to a specified screen through the reflector, and therefore, a clear image can be formed. The ultra-short-focal projection objective lens of the invention has the advantages of fewer adopted lenses, simple structure, ultra low projection ratio, ultra low distortion, moderate size, moderate tolerance, excellent techniques and the like.

Description

technical field [0001] The invention relates to a projection objective lens applied in the field of projection display, in particular to an ultra-short-focus projection objective lens. Background technique [0002] With the rapid development of key technologies such as high-brightness light sources, precision optical processing, high-resolution display chips, and polarized 3D, projection display equipment occupies an important share in the display field. Although projection display equipment is playing an increasingly important role in modern culture, commerce, and entertainment activities, it cannot really enter the large-screen consumer fields such as the public and families. The main reason is that it is limited by the technology of projection objective lens in projection display equipment. Consumers generally hope that projection equipment can project large-scale, high-quality, low-distortion and high-brightness images in a limited space. Therefore, as the core componen...

AI Technical Summary

Problems solved by technology

The ultra-short-focus lens is characterized by a large field of view. The ultra-short-focus lens manufactured by traditional technology will be accompanied by problems such as large distortion, large number of lenses, complex structure, strict tolerance, poor process adaptability, and excessive lens size.

For example, the ultra-short-focus lens described in Chinese Patent No. 200410045523.4 uses a total of 17 lenses, including 3 aspherical lenses. The display chip ratio reaches 7, reflecting that the lens is too large, and this patented technology does not have the potential to promote the ultra-short-focus lens to industrialization

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