Optical projector with off-axis diffractive element and conjugate images
US10545457B2 · kind B2 · utility
1Cited by
2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 8, 2019 |
| Grant date | Jan 28, 2020 |
| Priority date | — |
| Expiry date | Mar 8, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2001/2207
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an embodiment, an off-axis hologram is provided. The off-axis hologram creates two, conjugate images which are on either side (off-axis) of the 0-order beam. A Multiple Beam Grating (MBG) is used to both duplicate the conjugate images and to redirect the images along the axis. The 0-order beam is blocked before or at the MBG. The MBG projects the images onto a 3D surface, such as a person's face.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.