Magnetic scale manufacturing method and magnetic scale

Details Magnetic scale manufacturing method and magnetic scale Magnetic scale manufacturing method and magnetic scale

2007-03-23

2009-11-17

Johnson, Amy Cohen (Department: 2841)

Geometrical instruments

Distance measuring

Scale reading position sensor

C033S706000, C033SDIG010, C324S207240

Reexamination Certificate

active

07617614

ABSTRACT:
First, an inner tube member is accommodated in an outer tube member. Then, rigid powder, having high rigidity and a hard-to-magnetize characteristic, into the inner tube member. Next, magnetic powder is filled into a recessed portion of the inner tube member. Then, the inner tube member is drawn out of the outer tube member. Then, a composite filler composed of the rigid powder, magnetic powder and outer tube member is subjected to a cold hydrostatic pressure pressing process as pre-processing. Next, the composite filler is heated and solidified into a billet. Then, the billet is subjected to a hot extrusion process so that it is formed into a bar-shaped workpiece. The bar-shaped workpiece is rolled onto a roller, and then the outer tube member is peeled off. Next, the bar-shaped workpiece is subjected to a cutting process so that it is formed into an elongated bar. Then, a magnetic section of the elongated bar is magnetized into a scale structure.

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patent: 2006-049302 (2006-02-01), None
First Office Action for Chinese Patent Application No. 200710091809X, issued Nov. 7, 2008 (10 pages).
Kato Kojiro, specification for U.S. Appl. No. 11/333,816, filed on Jan. 17, 2006.

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