Optical lens device for a head-mounted display, and method and mold for producing the same
US11719862B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 28, 2020 |
| Grant date | Aug 8, 2023 |
| Priority date | — |
| Expiry date | Nov 30, 2041 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2033/12
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An optical lens device for a head-mounted display includes a transparent support substrate and a Fresnel lens disposed thereon. The Fresnel lens includes a central lens element and a plurality of prismatic elements arranged relative to the central lens element in a proximal-to-distal manner. Each of the prismatic elements has a base facing toward the support substrate, and a draft facet and a sloped facet extending from the base away from the support substrate to intersect with each other to form an apex. Each of the prismatic elements has a height measured from the base to the apex and not greater than 75 μm. The base has a width not greater than 250 μm. A method and a mold for producing the optical lens device are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.