Heater unit for tray
US6476361B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 2001 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Nov 30, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05B2203/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A heater unit mounted on a tray utilizes a PTC heater 100 having a positive temperature coefficient (PTC), and a sheet heater 200 superposed thereto. The PTC heater 100 includes PTC members 150 buried within an insulating substrate 130, and on both sides of the PTC members are placed copper foils 120, 122 functioning as electrodes. When the PTC heater 100 is heated up to a preset temperature, the electric resistance of the heater is increased greatly, and the heating is stopped, maintaining the preset temperature. The sheet heater 200 contributes to reduce the time the heater needs to rise to the preset temperature during initial startup.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.