Clamping plate, cartridge case, information medium, mold, and method of manufacturing clamping plate
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United States of America Patent
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Oct 27, 2009
Grant Date -
Feb 15, 2007
app pub date -
Aug 7, 2006
filing date -
Aug 9, 2005
priority date (Note) -
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Abstract
A clamping plate capable of reliably clamping a disk-shaped medium. In the clamping plate, at an imaginary intersecting portion between an imaginary extended surface of a rear surface of an outer peripheral portion of a main body and an imaginary extended surface of a rear surface of an inner peripheral wall of the main body, an annular groove recessed from the imaginary extended surfaces in the directions of the thicknesses of the outer peripheral portion and the inner peripheral wall is formed along an imaginary cross line of the imaginary extended surfaces.
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