Optical apparatus having dust off function
US7486326B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2004 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Jan 15, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/811
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical apparatus having dust-off function comprises a dust-off filter located in the vicinity of an optical electronic device such as an image-pickup element, an image display element, or the like. An optical apparatus includes a mechanism that controls vibrating operation so that the frequency of vibration waves generated in the filter changes with the passage of time. An optical apparatus includes first vibrator for successive vibration with frequencies, a circuit monitoring the state of vibration of the optical element during vibrating operation of the first vibrator, thereby detecting the resonance frequency of the element, and second vibrator for vibration with the detected resonance frequency or a frequency approximate to it. An optical apparatus includes monitor for monitoring the state of vibration of the filter and a circuit for detecting abnormal states in accordance with output signals from the electrode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.