Patent ID: 7236450
Filing Date: 2007-06-26
Classification: G11B

Abstract:
1. A recording medium comprising: a resin substrate having a first thermal expansion coefficient, a center hole, a first surface, and a second surface opposite to said first surface; a recording layer formed on said first surface of said resin substrate, said recording layer having a recording region, an inner nonrecording region formed inside the inner periphery of said recording region, and an outer nonrecording region formed outside the outer periphery of said recording region; a protective layer formed on said first surface of said resin substrate so as to cover said recording layer; and a thermal deformation suppressing layer formed on said second surface of said resin substrate except in an inner peripheral region having a predetermined range from said center hole, a region corresponding to said recording region, and a region corresponding to said outer nonrecording region, said thermal deformation suppressing layer having a second thermal expansion coefficient smaller than said first thermal expansion coefficient.