Patent ID: 6628590
Filing Date: 2003-09-30
Classification: G11B

Abstract:
An information recording-reproducing apparatus for carrying and installing a large diameter disc-type recording medium and a small diameter disc-type recording medium, including a carriage path, and carrier means for carrying said recording medium along said carriage path,said information recording-reproducing apparatus comprising: optical detecting means arranged in said carriage path at one location close to said carrier means, for optically detecting said recording medium when said recording medium passes through said location; mechanical detecting means arranged in said carriage path at another location close to said carrier means and outside said optical detecting means with respect to a center of said carriage path, for mechanically contacting with and detecting said recording medium when said recording medium passes through said another location; and determining means for determining whether an inserted object is said large diameter disc-type recording medium, a small diameter disc-type recording medium, or an object not to be installed, based on detection signals output from said optical detecting means and said mechanical detecting means.