Patent ID: 8010975

Claim:
A disc cartridge accommodating a photon mode optical information recording medium, comprising: a housing having an opening section; and a shutter disposed so as to be movable between a closing position to close said opening section and an opening position to open said opening section, wherein said housing includes a light path bending portion that bends a clearance between said shutter at the closing position and said housing at least at two points, said light path bending portion being formed by a housing-side recess formed in an edge portion of said opening section in said housing such that said shutter at the closing position is located therein, wherein an end portion of said shutter is substantially parallel to a moving direction thereof, and wherein said housing-side recess is tapered such that a width of said housing-side recess in a thickness direction of said shutter narrows toward a deep end of said housing-side recess from said edge portion of said opening section.