Image fixing apparatus with safety relay and control thereof
US8139963B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2009 |
| Grant date | Mar 20, 2012 |
| Priority date | — |
| Expiry date | Jun 3, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2221/1639
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image fixing apparatus has an integration circuit which is provided in a signal path from a comparison circuit to a relay drive circuit and integrates a signal input to the integration circuit, wherein an integral value of the signal input to said integration circuit reaches a reference value; and a latch circuit having an input port connected to a signal path from said integration circuit to the relay drive circuit and an output port connected to a signal path from the comparison circuit to the integration circuit. The latch circuit continuously transmits a signal from said output port to the integration circuit, upon a change in a signal level of the input port so that the relay is switched to the open position, and latches the relay in the open position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.