Drive device and projection-type image display device
US10965920B2 · kind B2 · utility
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6Claims
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Key dates
| Filing date | Jun 24, 2019 |
| Grant date | Mar 30, 2021 |
| Priority date | — |
| Expiry date | Jun 28, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/1466
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A drive device includes a housing in which a gas is sealed, wherein density of the gas is lower than density of air, a driven object housed inside the housing, a driver configured to drive the driven object, a current detector configured to detect a value of a current flowing into the driver, and a determinator configured to determine a concentration of the gas inside the housing based on the value of the current detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.