Short-focus projection lens structure with throw ratio of 1.05

Abstract

The invention discloses a short-focus projection lens structure with a throw ratio of 1.05. The short-focus projection lens structure with the throw ratio of 1.05 is characterized by comprising eight lenses which are arranged orderly. Among the eight lenses, a first lens of a front group is a negative meniscus spherical lens, a second lens of the front group is the negative meniscus spherical lens, a third and fourth lenses of the front group are balsaming lenses, a first lens of a back group is a plano-concave singlet lens, a second lensof the back group is a plano-convex singlet lenses, a third lens of the back group is an aspheric hard resin lens, and a fourth lens of the back group is a positive meniscus lens. The short-focus projection lens structure with the throw ratio of 1.05 is super-short in distance and small in brightness loss, is mainly applied to ultra-thin large screen back projection ( thickness of the large screen back projection with 100 inches is only 2.1 meters or so), and is also can be used for occasions such as window display, public display space, electric art exhibition, games, display and demonstration and top grade commercial institution foreground.

Description

technical field [0001] The invention relates to a short-focus projection lens structure, in particular to a short-focus projection lens structure applied to large-screen rear projection, large-screen or large-scale spherical screen splicing projection. Background technique [0002] Generally, the focal length of the lens used in rear projection products is relatively long, so when realizing large-screen rear projection, the thickness of 100-inch rear projection is often more than 2.1 meters, and the same problem of large distance also exists in large-screen splicing. Fisheye lenses are basically used in spherical screen projection, but the brightness and image quality of fisheye lenses are far inferior to those of short-focus lenses in terms of splicing and fusion in large-scale spherical screens. [0003] Digital projectors are mainly based on three core technologies, namely DLP (Digital Light Prosesing, with DMD as the target surface, reflective lighting), LCD (Liquid Crys...

AI Technical Summary

Problems solved by technology

Therefore, the design of ordinary short-focus projection lenses is very different, which is manifested in different rear working distances, different working wavelengths, and different handling methods for aberrations.

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