Imaging apparatus
US8052340B2 · kind B2 · utility
0Cited by
2References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 14, 2009 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Dec 14, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B9/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light quantity adjuster includes: a blade member forming an aperture; a stepping motor that moves the blade member to open/close the aperture; and a control section that controls driving of the stepping motor, and increases a rotational speed of the stepping motor after a resistance acting on the stepping motor changes from static friction to dynamical friction in case of closing the aperture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.