Foreign substance removing apparatus
US8075143B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 6, 2007 |
| Grant date | Dec 13, 2011 |
| Priority date | — |
| Expiry date | Jun 19, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/811
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A foreign substance removing apparatus that can provide the desired vibration amplitude to a light transmitting member, without using a large driving voltage. The foreign substance removing apparatus removes foreign substances adhered to a surface of an optical member disposed in a light ray incident path and includes a piezoelectric element fixed to a first plane of the optical member, a circular disk fixed to a second plane, opposite from the first plane, of the optical member so as to face the piezoelectric element, and a driving unit for applying an AC voltage to the piezoelectric element to cause the optical member to elastically vibrate in a direction perpendicular to the planes thereof, thereby removing the foreign substances adhered to the surface of the optical member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.