Projection lens

By rationally planning the lens combination and adopting the design of aspherical lenses and cemented lenses, the contradiction between high image quality and miniaturization of projection lenses has been resolved, achieving both miniaturization and high image quality, making it suitable for diverse projection needs.

CN122284052APending Publication Date: 2026-06-26CHENGDU XGIMI TECH CO LTD
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Patent Information

Application Number
CN202411944148.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing projection lenses struggle to simultaneously achieve high image quality and miniaturization, resulting in projection distortion and limited field of view.

Method used

The design employs a combination of at least eight lenses, including aspherical lenses and cemented lenses. By rationally planning the number of lenses, optical power, and refractive index, and combining the position of the aperture stop, the light path and thermal compensation are optimized, thereby reducing the number of lenses and shortening the overall length.

Benefits of technology

It achieves high image quality while miniaturizing, reducing manufacturing difficulty, making it suitable for mass production. It has sufficiently low distortion and stable imaging effect, adapts to different environmental conditions, and supports the projection requirements of high-resolution chips.

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Abstract

The invention provides a projection lens. The projection lens comprises a lens group which comprises at least eight lenses. The eight lenses are sequentially a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power, a sixth lens with focal power and a seventh lens with focal power from the first side to the second side; the eighth lens has focal power; at least one group of lenses from the fourth lens to the eighth lens is glued to form a doublet lens or a triplet lens; the ratio of the combined focal length of the doublet lens to the focal length value of the second lens group is greater than or equal to 1 and less than or equal to 8; or the ratio of the focal length value of the triplet lens to the focal length value of the second lens group is greater than or equal to 0 and less than or equal to 14. According to the invention, the problem that the projection lens in the prior art is difficult to give consideration to the projection picture quality and miniaturization at the same time is solved.
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