Patent ID: 6657818
Filing Date: 2003-12-02
Classification: G11B

Abstract:
A shutter supported by a case body containing a recording medium so as to be slidable for opening and closing an opening formed in said case body, said shutter comprising:a base layer; and first and second covering layers formed to cover said base layer, wherein each said covering layer contains a different pigment; each said covering layer is made of one of a polyester and an epoxy resin based resin; a thickness of said first covering layer is in a range of 4 um to 6 um; a thickness of said second covering layer is in a range of 8 um to 10 um; a difference in hue between an uppermost layer and an underlying layer thereof is in a range of at least two in a hue cycle of a predetermined practical color co-ordinate system; and markings formed in a surface portion of said shutter by cutting away regions corresponding to said markings of said surface portion of said shutter to a depth extending to one of a bottom of said uppermost layer and to a part of said underlying layer through said uppermost layer.