Image forming apparatus with heat fixing device powered by bidirectional thyristor
US11782364B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 18, 2021 |
| Grant date | Oct 10, 2023 |
| Priority date | — |
| Expiry date | Aug 18, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/5045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image forming apparatus includes a fixing unit including a heater; a bidirectional thyristor for supplying electric power form an AC power source to the heater in a conduction state and for cutting off supply of the electric power from the AC power source to the heater in a non-conduction state; a control unit for outputting a control signal for controlling the conductive state or the non-conduction state of the bidirectional thyristor; and a DC voltage source for supplying electric power for conduction of the bidirectional thyristor by the control signal outputted from the control unit. The control unit controls the heater in a predetermined control cycle on a one half-wave unit basis of an AC voltage of the AC power source. The control unit outputs a plurality of control signals in one half-wave of the AC voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.