Ocular Lens Layout for Wide-Angle HMDs Without Flange Growth
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Solution Overview
Problem
Existing ocular optical systems in HMDs face challenges in achieving a wide angle of view while maintaining a lightweight and compact design, as they often increase in size due to the inclusion of ejector pin flange portions outside the optical effective diameter.
Innovation Solution
The lens design includes ejector pin marks outside the optical effective diameter on one side and inside on the other, reducing the non-optical effective diameter and preventing the flange portion from increasing the size, while using polarization to fold the optical path and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ejector pins are installed outside the optical effective diameter on the first surface, then the lens has high surface accuracy in the optical area, but the lens size increases due to the flange portion
Solution Approach 1:
The patent moves the ejector pin marks from the first surface to the second surface of the lens, utilizing the third dimension (depth/thickness) to resolve the contradiction. By positioning at least one ejector pin mark inside the optical effective diameter on the second surface, the flange portion is eliminated, reducing lens size while maintaining manufacturing capability.
Solution Approach 2:
Instead of placing ejector pin marks outside the optical effective diameter on the first surface as in conventional designs, the patent inverts this approach by placing marks on the second surface, with at least one mark inside the optical effective diameter. This inversion eliminates the need for a flange portion while ensuring high surface accuracy in the optical area.
2Adaptability or versatility
If the ocular optical system is increased in size to provide a wide angle of view, then the angle of view widens, but the device becomes heavier and larger
Solution Approach 1:
The patent changes the geometric parameters of the lens by eliminating the flange portion through strategic placement of ejector pin marks on the second surface. This parameter change allows the optical effective diameter to be maximized relative to the total lens size, enabling a wide angle of view without increasing overall device dimensions or weight.
Data Source
AI summary
A lens including ejector pin marks formed at contacting portions with ejector pins used in molding, with a first side including the ejector pin marks and a second side not including the ejector pin marks. The ejector pin marks are located outside of an optical effective diameter on the first side, and at least one of the ejector pin marks on the first side is located inside an optical effective diameter on the second side.