Production method for a magnetostrictive torque sensor

Details Production method for a magnetostrictive torque sensor Production method for a magnetostrictive torque sensor

2008-01-09

2010-06-08

Kim, Paul D (Department: 3729)

Metal working

Method of mechanical manufacture

Electrical device making

C029S592100, C073S862331, C073S865500

Reexamination Certificate

active

07730602

ABSTRACT:
A method for producing a magnetostrictive torque sensor which detects steering torque applied to a steering shaft. A magnetostrictive film is formed on the steering shaft and then subjected to heat treatment, which decreases a weight ratio of hydrogen included in the magnetostrictive film. Thermal desorption gas analysis is performed on at least a portion of the magnetostrictive film undergoing the heat treatment step. A portion of the magnetostrictive film having a thickness of 40 μm or less is heated at a temperature rise rate of 5° C. per minute. A weight ratio of a total amount of hydrogen desorbed from the portion of the magnetostrictive film due to the heat treatment to a weight before the heat treatment is no more than 3 ppm up to 150° C., wherein the weight ratio is no more than 10 ppm up to 300° C., and no more than 15 ppm up to 400° C.

REFERENCES:
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patent: 7310870 (2007-12-01), Shimizu et al.
patent: 2007/0068726 (2007-03-01), Shimizu
patent: 2002-082000 (2002-03-01), None
patent: 2002-250662 (2002-09-01), None
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patent: 2004-333449 (2004-11-01), None
patent: 2006-322952 (2006-11-01), None

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