Ceramic heater/fuser roller with internal heater
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 4, 2001
Grant Date -
N/A
app pub date -
Jul 12, 2000
filing date -
Jul 12, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thermal conduction roller (10) has a tubular roller core (11) with an inside surface; and an electrical insulator coat (16) primarily of zirconia on the inside surface, a heater coat (18) of titania or a titania blend is disposed over the insulator coat (16), and at least two electrical contact assemblies that are disposed inside the roller and electrically connect to the heater coat (18) as the roller (10) is being rotated. One embodiment utilizes an electrical insulator coat (16) in a range of thickness from about ten mils to about twenty mils. A thinner coat may not have sufficient dielectric strength, while a thicker coat decreases thermal conduction. A release material (12) is applied to the outside of the roller (10). Various contact structures according to the present invention are also described in detail, including one especially adapted to connect to a three-phase power supply.
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