Augmented-reality optical system having short focus and large exit pupil

By designing an optical system including first, second and third imaging units and utilizing total reflection and semi-reflection optical paths, the problems of limited field of view angle and exit pupil diameter of existing augmented reality optical systems are solved, and a large exit pupil range and short focus effect are achieved, which is suitable for people with different pupil distances and refractive powers.

WO2025200152A1 Publication Date: 2025-10-02CETHIK GRP
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Patent Information

Application Number
PCT/CN2024/101150
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-03-29
Filing Date
2024-06-25
Publication Date
2025-10-02

AI Technical Summary

Technical Problem

Existing augmented reality optical systems are limited in field of view angle and exit pupil diameter, and cannot meet the needs of people with different pupil distances and refractive powers. They are also unable to achieve short focus and large field of view, resulting in limited applications.

Method used

An optical system consisting of a first imaging unit, a second imaging unit, and a third imaging unit is adopted. Through a total reflection and semi-reflection optical path design, and using a combination of curved surfaces and prisms, multiple reflections of light in the second imaging unit are achieved, and the light reaches the exit pupil position through reflection and transmission through the third imaging unit, optimizing aberration compensation to achieve a large exit pupil range.

Benefits of technology

An augmented reality optical system with a large exit pupil range is realized to meet the viewing needs of people with different pupil distances and refractive powers, providing a better viewing experience.

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Abstract

An augmented-reality optical system (100) having a short focus and a large exit pupil. The optical system (100) comprises: a first imaging unit (1), a second imaging unit (2) and a third imaging unit (3), wherein incident light transmits through a first cambered surface (111) of the first imaging unit (1) to a second cambered surface (211) of the second imaging unit (2), and the incident light undergoes total reflection and partial reflection in the second imaging unit (2), and then reaches an inner cambered surface (31) of the third imaging unit (3), and the incident light is reflected by the inner cambered surface (31) and transmits through the second imaging unit (2) to reach an exit pupil position. The cambered surface in the second imaging unit (2) of the optical system (100) can make more light undergo total reflection, such that more light is reflected via a shorter light path to reach an exit pupil position. In addition, the inner cambered surface (31) of the third imaging unit (3) compensates for and optimizes aberrations between the other surfaces, and thus a larger exit pupil range can be obtained while ensuring the imaging quality, thereby satisfying watching requirements of people with different pupillary distances and different diopters, and achieving a better watching experience.
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