Projection lens

By designing a projection lens consisting of three lens groups, combined with reflective elements and lens power design, the problem of low brightness and contrast in long back focal length projection lenses was solved, achieving high brightness, low color difference and low distortion imaging effects.

CN121763545APending Publication Date: 2026-03-31YIBIN XGIMI OPTOELECTRONIC CO LTD
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Patent Information

Application Number
CN202411383150.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-09-30
Publication Date
2026-03-31

AI Technical Summary

Technical Problem

Existing long back focal length projection lenses with continuous zoom suffer from problems such as excessive lens length, low contrast, and low brightness.

Method used

The projection lens design consists of three lens groups: a first lens group for focusing, a second lens group for zooming, and a third lens group for fixing the lens group. By placing a reflective element between the third lens group and the second lens group, an L-shaped folding structure is formed. Combined with the optical power of the lens and the design of the cemented lens group, continuous zoom and high brightness are achieved.

Benefits of technology

It achieves high brightness, low chromatic aberration, low distortion and high image quality in long back focal length projection lenses, while reducing lens length and axial space occupation, and providing flexible projection direction selection.

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Abstract

The invention belongs to the technical field of projection optical lenses, and discloses a projection lens which can form a lens structure with a long back focal length through three lens groups which are respectively used for focusing, zooming and fixing, can obtain higher brightness and contrast through the lens structure with the long back focal length, and is more beneficial to heat dissipation. On the basis, continuous zooming can be achieved through the first zoom lens set, the second zoom lens set and the third zoom lens set which independently move along the optical axis, and meanwhile under the condition that the back focal length is long or the length of the lens is fixed, through the design in the aspects of back focal length control, lens materials and / or lens gluing and the like, continuous zooming can be achieved. The problems of chromatic aberration and difficult light correction caused by a long back focal length lens structure can be solved in the aspects of aberration, chromatic aberration and the like, the contrast ratio and the brightness are better improved, and the purposes of long back focal length, high brightness, low chromatic aberration, low distortion, large aperture and high imaging quality of the projection lens are finally achieved.
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