Tilt sensor using diffraction grating
US7577076B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2004 |
| Grant date | Aug 18, 2009 |
| Priority date | — |
| Expiry date | Jan 17, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/13925
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tilt sensor for detecting information related to a tilt of an object to a reference plane is disclosed. The tilt sensor includes a diffraction element disposed that diffracts an incident light at diffraction efficiency depending on the incident angle, and a photo detector that detects a diffraction light diffracted by said diffraction element and outputs an photoelectric signal. Since the diffraction efficiency of the diffraction element changes as the incident angle changes, the intensity of the diffraction light from the diffraction element changes. As a result, the photoelectric signal output from the photo detector contains the information related to the tilt of the object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.