Devices and methods for lens position adjustment based on diffraction in a fresnel lens
US10620432B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 25, 2017 |
| Grant date | Apr 14, 2020 |
| Priority date | — |
| Expiry date | Apr 29, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0134
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method includes displaying a high contrast image on a display screen; and projecting the high contrast image through a Fresnel lens to provide a cue for adjusting a position of the Fresnel lens. Also disclosed is a device for determining and/or adjusting an offset of a Fresnel lens. The device includes a Fresnel lens and a display screen configured to project a high contrast image through the Fresnel lens. Further disclosed is a method for adjusting a position of a Fresnel lens. The method includes receiving a projection of a high contrast image transmitted through a Fresnel lens; and adjusting a position of the Fresnel lens based on the projection of the high contrast image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.