Diffractive optical element and optical imaging device

By reverse-engineering diffractive optical elements, reducing etching depth and size, the problem of stray light spots on the camera was solved, achieving a high-definition imaging effect where the pattern blends naturally with the background, and simplifying the image editing process.

WO2026026943A1PCT designated stage Publication Date: 2026-02-05ZHANGZHOU QIXIANG INTELLIGENT TECHNOLOGY CO LTD
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Patent Information

Application Number
PCT/CN2025/112089
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-08-02
Filing Date
2025-08-01
Publication Date
2026-02-05

AI Technical Summary

Technical Problem

When existing diffractive optical elements are used in cameras, the high diffraction efficiency leads to stray light spots, which affects image quality and requires complex image editing, and existing technologies have not been able to effectively solve this problem.

Method used

The diffractive optical element, which adopts a reverse design, reduces diffraction efficiency and increases light transmittance by reducing the etching depth and size of the patterned area, and reduces stray light spots. It also increases the amount of light entering the camera and the shutter response speed by increasing the size of the light-transmitting area.

Benefits of technology

It achieves natural blending of patterns and backgrounds without affecting the image quality, simplifies the image editing process, and improves imaging effect and convenience.

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Abstract

A diffractive optical element (10) and an optical imaging device (20). A diffractive optical element (10) can be arranged on a camera of an optical imaging device (20) for assisting the camera (20) in imaging. The diffractive optical element (10) is obtained by means of reverse design. The reversely designed diffractive optical element (10) aims to solve the problem of stray light spots occurring in the diffractive optical element (10) during photographing and imaging, and enables the diffractive optical element (10) to have a better light transmission capability. The reverse design comprises reducing the etching depth of a pattern region (11) in the diffractive optical element (10), so as to reduce the primary diffraction efficiency and the secondary diffraction efficiency of the diffractive optical element (10), thereby enhancing light transmission capability and reducing stray light spots on a captured image. The reverse design further comprises reducing the size of the pattern region (11) in the diffractive optical element (10), which reduces diffraction efficiency and increases the amount of light entering a light-transmitting region, enabling the aperture (21) of the camera (20) to receive more light, thereby increasing the amount of light entering the background and improving shutter response speed, and enhancing overall background quality in photographs.
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Citation Information

Patent Citations

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