Image forming apparatus
US8055145B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 2008 |
| Grant date | Nov 8, 2011 |
| Priority date | — |
| Expiry date | Feb 12, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/00059
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes a controller for detecting the opening and closing of a shutter from the output from an optical sensor and controlling the opening and closing operation of the shutter based on the detected result. The controller determines that if the optical sensor is turned “ON” within a predetermined period of time from when the shutter begins opening, the operation of the shutter from the closed state to the open state is correctly detected. When no reflected light is detected by the optical sensor even after a predetermined time has elapsed, the controller determines that an anomaly has occurred and closes the shutter and repeat another detecting process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.