Patent ID: 7103902
Filing Date: 2006-09-05
Classification: G11B

Abstract:
1. A recording medium cartridge comprising: a cartridge casing composed of upper and lower shells having an information recording medium, an inner rotor and a shutter accommodated therein and operably connected to the inner rotor, the shutter having a pair of movable shutter members contacting each other in a closed position and disposed apart from one another in an opened position, a recording/reproducing opening part for allowing one part of the information recording medium to diametrically face at least one shell of the upper and lower shells of the cartridge casing; and a central opening part for driving the information recording medium, the inner rotor being rotated in one direction to drive the shutter and open the recording/reproducing opening part and the central opening part, wherein the shutter is driven from a position where the recording/reproducing opening part and the central opening part are opened and the pair of shutter members are in the opened position to a position where the recording/reproducing opening part and the central opening part are closed and the pair of shutter members are in a closed position by returning and rotating the inner rotor to the other direction by an extension coil spring or a compression coil spring.