Zigzag heating device with downward directed connecting portions
AssigneeToshiba Machine Co., Ltd.
InventorsTakaaki Honda, Shinichi Mitani
Life of this patent
Estimating the term…
Abstract
A heating device has a plurality of strip heating portions separated by a plurality of slits. The strip heating portions are connected to one another by connecting portions, thereby forming a heating surface in which a zigzag current path extends. The connecting portions in which uneven-temperature regions exist are bent so as not to be positioned in the same plane as the heating surface, thereby making the heating surface, to be opposed to an object to be heated, to have a uniform temperature.
Claims5
A heating device incorporating a disk-shaped heater having a heating surface substantially parallel to a surface of an object to be heated, and a ring-shaped heater surrounding the disk-shaped heater, the disk-shaped heater comprising:
- opposite end portions;
- a plurality of strip heating portions of a predetermined width placed between the opposite end portions, separated by a plurality of slits and extending substantially parallel to one another;
- and
- connecting portions connecting the bent portions of each adjacent pair of the strip heating portions and the opposite end portions, thereby forming a heating surface in which a current path has bent portions thereof connected to terminals, the connecting portions extending so that they are not positioned in the same plane as the heating surface;
- the ring-shaped heater comprising:
- a plurality of short strip heating portions separated by a plurality of slits extending radially;
- and
- connecting portions alternately connecting inner circumferential ends and outer circumferential ends of the strip heating portions, thereby forming a current path having opposite ends connected to terminals, the connecting portions extending so that they are not positioned in the same plane as the heating surface of the disk-shaped heater.
Dependencies are inferred from the claim text.