Heater unit for tray
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Nov 5, 2002
Grant Date -
Jun 6, 2002
app pub date -
Nov 30, 2001
filing date -
Dec 5, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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