Wide-angle telecentric digital projector lens with small projection ratio

Abstract

The invention discloses a wide-angle telecentric digital projector lens with the small projection ratio. The lens comprises successively arranged ten lens groups including ten lenses in all from a left end display chip. The first lens is a double-convex spherical lens. The second lens is a double-convex spherical lens. The third lens is a double-concave lens. The fourth lens is a double-convex lens. The fifth lens is a double-convex lens. The sixth lens is a concave-convex lens. The seventh lens is a double-convex lens. The eighth lens is a concave-convex spherical lens. The ninth lens is a crescent-shaped non-spherical lens. The tenth lens is a concave-convex spherical lens. The lens is advantaged by simple structure, low cost, favorable technique and quite excellent tolerance performance.

Description

technical field [0001] The invention relates to a digital projector lens structure, in particular to a telecentric digital projector lens with wide angle and small projection ratio applied to large screens. Background technique [0002] The throw ratio of ordinary digital projectors is usually between 1.5 and 1.9, and when the throw ratio reaches below 1, we usually call it a short-focus lens. Because for a room that does not change in size, the shorter the focal length, the larger the image that can be projected. [0003] With the increasing application of high-brightness engineering projectors, the requirements for performance changes with the temperature of the projection lens are getting higher and higher. In the current technology, the temperature of many lenses increases with the increase of the internal temperature of the projector. Projection performance degradation is severe. [0004] In the process of projection lens design, relevant parameters such as image heig...

AI Technical Summary

Problems solved by technology

[0004] In the process of projection lens design, relevant parameters such as image height, field of view, focal length, and relative aperture are mutually restricted, which have a great impact on the final imaging quality. In particular, the amount of distortion is difficult to control, so it is difficult to design a projection ratio less than 1. A lens with high transmittance and distortion that meets the requirements of use

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