Title:
DEMAGNETIZING UNIT
Document Type and Number:
Japanese Patent JPS60163410
Kind Code:
A
Abstract:
Auto transformer supplying current to the object to be demagnetized (chuck), this current controlled by an ON set of transformers, and a DEMAG set of transformers. Each set includes a pair of secondaries providing pulsating current for respective half cycles of AC, of opposite polarity. The opposite polarity of pulsating current is produced in intervals of decreasing time and voltage, until the magnetism in the object is at or near zero. The control transformer sets are controlled by a unit establishing selected values of voltage, that voltage controlling a cross-over unit which includes transistors, which in turn control the intervals of the control transformers. A CMOS oscillator circuit, with an oscillator chip, including NAND gates, effects alternate energization of the control transformers.
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Inventors:
JIYOSEFU EI AAMONDO
Application Number:
JP562485A
Publication Date:
August 26, 1985
Filing Date:
January 16, 1985
Export Citation:
Assignee:
EREKUTOROMACHITSUKU PURODAKUTS
International Classes:
H01F13/00; (IPC1-7): H01F13/00
Attorney, Agent or Firm:
Kyozo Yuasa