HMD Optical Imaging Spacer Structure for Stray Light and Assembly
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Solution Overview
Problem
Existing optical imaging systems for head-mounted display devices face challenges in assembly precision and stray light issues due to the design of lenses with convex surfaces, which complicate adherence and affect user visual experience.
Innovation Solution
An optical imaging system with a spacer that supports a display screen and lens, featuring a main support surface and an avoidance surface to facilitate assembly and prevent stray light, using convex portions and step surfaces to manage light reflection effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a lens with convex surfaces is used to correct field curvature, then optical imaging quality is improved, but assembly difficulty increases and adherence becomes inconvenient
Solution Approach 1:
A spacer component is introduced as an intermediary between the lens and the display screen assembly. The spacer includes a support surface that contacts the lens and a positioning structure that interfaces with the display screen, thereby mediating the assembly process and simplifying the adherence of convex-lensed components.
Solution Approach 2:
The optical imaging system is segmented into distinct functional modules: the display screen, the spacer (with support surface and positioning structure), and the lens. This segmentation allows each component to be optimized independently and simplifies the overall assembly process by breaking down the complex integration of convex-lensed components.
2Manufacturing precision
If a lens with convex surfaces is used to correct field curvature, then optical imaging quality is improved, but stray light increases and visual experience deteriorates
Solution Approach 1:
The spacer structure, which was initially introduced to solve assembly difficulties, is designed to also address stray light issues. The positioning structure and support surface configuration inadvertently create light-blocking features that prevent stray light from reaching the user's eye, converting an assembly solution into a dual-purpose component that also eliminates harmful optical interference.
3Manufacturing precision
If upper and lower surfaces of lenses are both convex surfaces, then field curvature is corrected, but adherence becomes inconvenient and assembly accuracy decreases
Solution Approach 1:
The spacer acts as a mediator that provides a stable reference surface for the convex lens while maintaining precise positioning relative to the display screen. This intermediary structure enables accurate assembly by decoupling the lens positioning function from the display screen interface, thereby improving assembly accuracy despite the complex convex lens geometry.
Data Source
AI summary
Embodiments of the present disclosure disclose an optical imaging system. A specific implementation is: an optical imaging system including: a spacer, a display screen, and a lens. The spacer has a central through hole. The spacer is provided with a first side and a second side on two sides in a thickness direction thereof. The second side has a main support surface and an avoidance surface extending from the main support surface to an edge defining the central through hole. The display screen is arranged on the first side. The lens has a main lens body and an outer edge portion connected to the main lens body. The main lens body is provided with outer convex portions on both sides in a thickness direction thereof, and an outer surface of each outer convex portion is at least partially higher than an outer surface of the outer edge portion on a corresponding side.