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    • 6. 发明专利
    • JPH05235127A
    • 1993-09-10
    • JP7354492
    • 1992-02-24
    • NIPPON DENSO CO
    • HASEBE YUJISAKAKIBARA NOBUYOSHI
    • H01L21/66H01L27/12
    • PURPOSE:To enhance the reliability of a device by a method wherein the temperature of the device during its operation is controlled accurately to a designed operating temperature. CONSTITUTION:A current control circuit 31 is controlled by using a microcomputer 50. An SOI device 9, a first thin film 1, a second thin film 2, a third thin film 3, a first bonding layer 11, a second bonding layer 12, an electromotive- force detection circuit 30 and the microcomputer 50 are formed on a board 40. An operating program is stored in advance in the microcomputer 50 so as to control an electric current by judging an electromotive force between the second thin film and the third thin film and by judging whether the SOI device 9 exists within a proper temperature range or not. Thereby, the temperature of the SOI device 9 can be controlled in such a way that it always exists within a designed operating temperature region.