Non-defocused optical wide-angle lens for projection display

Abstract

The invention provides a non-defocused optical wide-angle lens for projection display. The wide-angle lens can realize non-defocus in a wider temperature range, and meanwhile, projection images are clear and fine. The lens mainly comprises a first lens set, a second lens set and a TIR (total internal reflection) prism which are sequentially arranged from the position of a projection screen to the position of a display chip, wherein an aperture diaphragm is arranged between the first lens set and the second lens set; all lens pieces of the first lens set and the second lens set are made of colorless optical glass or colorless optical plastic; the overall focal power of the first three lens pieces in the first lens set is negative, and at least one of the first three lens pieces in the first lens set is a plastic non-spherical lens; at least one of first four lens pieces of the second lens set is a plastic non-spherical lens, at least part of other lens pieces in the first four lens pieces constitute a balsaming lens part, and the optical power of the balsaming lens part is negative; the refractive index n1 of the colorless optical glass is larger than 1.4 and smaller than 1.95, and the refractive index n2 of the colorless optical plastic is larger than 1.5 and smaller than 1.6.

Description

technical field [0001] The invention relates to an optical lens structure for projection display. Background technique [0002] Under normal circumstances, when projecting a display screen, with the accumulation of internal heat, it will cause thermal defocusing, which is manifested as image blurring. Surface and display devices (such as LCD, LCOS, DMD) will no longer coincide. [0003] There are three common ways to solve this problem: [0004] 1. Manually adjust the lens to visually judge whether it is clear or not; [0005] 2. Send a drive command to the built-in motor of the projector through the remote control to adjust the lens to visually judge whether it is clear or not; [0006] 3. Install a camera on the projector to monitor the clarity of the projection screen in real time. If the image becomes blurred, the software will calculate the amount of lens movement that needs to be adjusted, and then send instructions to drive the motor. The software processes the ca...

AI Technical Summary

Problems solved by technology

[0009] The first solution: manual adjustment, lower customer experience satisfaction

[0010] Scenario 2: The remote control and motor may fail, resulting in a less satisfied customer experience

[0011] The third solution: Compared with the second solution, the reliability is lower, and the camera, software and motor may fail, resulting in lower customer experience satisfaction

However, this solution still has shortcomings, such as a large number of lenses, a large volume of the optical system, high production costs, high installation and maintenance costs, so the market response is not very satisfactory

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