Patent ID: 7417206
Filing Date: 2008-08-26
Classification: H01L,H05B

Abstract:
1. A heater comprising a plate-shaped member having a first principal surface which is a mount surface whereon an object to be heated is placed, a second principal surface, a plurality of resistive heating members provided therein or on the second principal surface and a plurality of resistive heating member zones each having one of the resistive heating members, the resistive heating member zones further comprising a circular central resistive heating member zone, first resistive heating member zones in which a first ring-shaped resistive heating member zone positioned outermost and concentric with the circular central resistive heating member zone is divided equally by a plurality of first boundaries in the radial direction, and second resistive heating member zones in which a second ring-shaped resistive heating member zone positioned inside of the first ring-shaved resistive heating member zone is divided equally by a plurality of second boundaries in the radial direction, wherein, the first boundaries and the second boundaries are not aligned on one line; wherein one of the resistive heating members is formed in a continuous band having at least two arc bands located on one of two concentric circles of different radii, at least one arc band located on the other circle, and linkage arc bands each of which connects the arc band located on the one circle and the arc band located on the other circle, said linkage arc bands being located adjacent to each other; and wherein the distance between the adjacent linkage arc bands is smaller than the distance between the arc band located on the one circle described above and the arc band located on the other circle.