Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Takemi Kawazoe0
Ko Yoshimura0
Tadahito Kanaizuka0
Date of Patent
May 1, 2007
0Patent Application Number
104989740
Date Filed
February 19, 2003
0Patent Primary Examiner
Patent abstract
A method for manufacturing a semiconductor module incorporated with an optical isolator making use of a Faraday rotator formed of a magnetic garnet film in which a magnetically saturated condition is maintained even without any external magnetic field, in which, at the time the magnetic garnet film is exposed to a temperature of 100° C. or more in a step during manufacture, an external magnetic field is applied in the same direction as the direction of magnetization of this magnetic garnet film. This manufacturing method has an advantage that the high-coercivity film magnetic garnet film is not removed from its magnetically saturated condition even when heating steps are present in the course of manufacture.
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