Projection optical module, projection optical apparatus, and near-eye display apparatus

CN224861843UActive Publication Date: 2026-10-16GOERTEK OPTICAL TECH CO LTD
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Patent Information

Application Number
CN202522092293.7
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-09-28
Publication Date
2026-10-16
Estimated Expiration
2035-09-28

AI Technical Summary

Technical Problem

[0003]然而，尽管μLED技术具有诸多优势，但在实际应用中，要实现基于μLED技术的AR光机的小型化和轻量化，仍然面临着诸多技术挑战

Benefits of technology

[0020]This application provides a projection optical module. The structure of the color-combining curved prism in the projection optical module is specially designed. The light-emitting surface of the color-combining curved prism forms a curved lens, and the curved lens has positive optical power. While meeting the requirements of the projection optical module for light propagation and imaging, the miniaturization of the projection optical module is achieved by reducing the air gap between the color-combining curved prism and the lens group. Furthermore, the projection optical module satisfies 0.7 < (L+H)/TTL < 0.8, making the color-combining curved prism compact in the image source corresponding to the image height, further realizing the miniaturization of the optomechanical system.

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Abstract

Embodiments of the present application provide a projection optical module, a projection optical device and a near-eye display device. The projection optical module comprises, in order along an optical axis from a magnifying end to a reducing end: a lens group, a color-combining curved prism and an image source; the overall optical power of the lens group is positive, the lens group comprises, from the magnifying end to the reducing end: a first lens with positive optical power, a second lens with positive or negative optical power and a third lens with negative optical power; the color-combining curved prism comprises an exit surface arranged towards the lens group, the exit surface is a curved lens, and the curved lens has positive optical power; wherein the total optical length of the projection optical module is TTL, the thickness dimension of the color-combining curved prism along the optical axis direction is L, the image height parameter of the image source is H, and the projection optical module satisfies: 0.7 < (L+H) / TTL < 0.8.
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