Curved Transmissive Reflective Surfaces for Wide Field Angle Imaging
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Solution Overview
Problem
Conventional optical systems for head mount displays face challenges in achieving high-definition imaging performance due to limitations in optical design freedom, particularly when one transmissive reflective surface is flat, which restricts the ability to improve imaging performance and achieve wide field angles.
Innovation Solution
The optical system incorporates a configuration with two transmissive reflective surfaces, both of which are curved, allowing for better cancellation of reflective and refractive powers, thereby enhancing imaging performance and enabling high-definition image display. This configuration includes a first and second transmissive reflective member sandwiched between refractive optical elements, reducing the refractive power of the transmissive reflective surfaces and improving optical design freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If one transmissive reflective surface is made flat to simplify manufacturing, then manufacturing precision is improved, but imaging performance deteriorates due to limited optical design freedom
Solution Approach 1:
The patent applies curvature to both transmissive reflective surfaces, transforming them from flat to curved surfaces. This enables the surfaces to function as both reflective and refractive elements, providing optical power in both directions and achieving high-definition imaging performance while maintaining manufacturing feasibility through standardized curved surface techniques.
2Measurement precision
If curved surfaces are used for both transmissive reflective surfaces to improve imaging performance, then measurement precision is improved, but device complexity increases due to additional optical design parameters
Solution Approach 1:
The patent makes both transmissive reflective surfaces serve multiple functions: they act as reflective surfaces for light direction control and as refractive surfaces for focusing power. This multi-functionality reduces the need for separate optical elements, thereby managing complexity while achieving high-definition imaging through optimized curved surface designs.
3Measurement precision
If curved surfaces are used for both transmissive reflective surfaces to achieve high-definition imaging, then measurement precision is improved, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent employs curved surfaces with optimized radius of curvature values that balance imaging performance requirements with manufacturing capabilities. By carefully selecting curvature parameters, the design achieves high-definition imaging while maintaining feasibility for precision manufacturing through established curved surface fabrication techniques.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves excellent imaging performance by optimizing the shape of the transmissive reflective surfaces, allowing for high-definition image display with a wide field angle and reduced chromatic aberration, while also simplifying the optical design and manufacturing process.
Implementation Method 1
a first transmissive reflective member having a first transmissive reflective surface that is a curved surface, a second transmissive reflective member having a second transmissive reflective surface that is a curved surface
Implementation Method 2
lens disposed closest to the display surface in the first optical system and lens disposed closest to the pupil surface in the second optical system are cemented with each other via the first transmissive reflective member
Implementation Method 3
Japanese Patent No. 6984261 discloses an optical system that reduces chromatic aberration by using a cemented lens
Data Source
AI summary
An optical system through which light from a display surface is guided to a pupil surface includes, in order from a pupil surface side to a display surface side, a first optical system, a first transmissive reflective member having a first transmissive reflective surface that is a curved surface, a second optical system, a second transmissive reflective member having a second transmissive reflective surface that is a curved surface, and a third optical system. A lens closest to the display surface in the first optical system and a lens disposed closest to the pupil surface in the second optical system are cemented with each other via the first transmissive reflective member. A lens closest to the display surface in the second optical system and a lens disposed closest to the pupil surface in the third optical system are cemented with each other via the second transmissive reflective member.