Projector with image plane modal vibration for speckle reduction
US9778478B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 4, 2016 |
| Grant date | Oct 3, 2017 |
| Priority date | — |
| Expiry date | Oct 4, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/005
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A projector with image plane modal vibration for speckle reduction is provided. The projector includes: a laser light source; a light modulator; and optics that convey light from the laser to the modulator and project modulated light from the modulator, the optics comprising an image plane. The projector further includes: a surface comprising at least a first region located at the image plane, the first region being at least as large as an image formed at the image plane, the first region configured to one or more of transmit and reflect the image; and at least three actuators, positions of interaction of the actuators with the surface are asymmetric relative to the surface, the actuators configured to generate respective moving surface waves in the first region at respective frequencies, the respective frequencies comprising non-integer multiples of each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.