Disk cartidge, disk recording medium device and disk recording and/or reproducing apparatus technical field

Abstract

The present invention relates to a disk cartridge in which a disk-like recording medium such as an optical disk, a magneto-optical disk and a magnetic disk is accommodated within a disk compartment of a cartridge housing, a disk recording medium device in which the disk-like recording medium is accommodated in advance within the disk compartment so as to become freely rotatable and a disk recording and/or reproducing apparatus for recording and/or reproducing information by using this disk recording medium device. According to a disk cartridge of the present invention, there is provided a disk cartridge composed of a cartridge housing including an upper shell, a rotary member and a lower shell, a shutter member movable between the opening position and the closing position to open and close an opening portion of the cartridge housing and a shutter fixing means for holding the shutter member in the closed state at the closing position and in which the shutter member is held in the opened state at the opening position by the shutter fixing means. According to the present invention, there is no risk that vibrations generated from an external apparatus will be transmitted to the disk cartridge and the like through an open and hold mechanism. Thus, malfunctions caused by vibrations can be prevented or suppressed when information is written in and read out from the disk-like recording medium.

1 . In a disk cartridge comprising: 
 a cartridge housing in which a disk compartment is formed between an upper shell and a rotary member or between said rotary member and a lower shell by combining said upper shell, said rotary member and said lower shell, said rotary member is supported by at least one of said upper shell and said lower shell so as to become freely rotatable and in which an opening portion is provided on at least one of said upper shell and said lower shell or on at least one of said upper shell and said lower shell and said rotary member;    a shutter member provided on said cartridge housing so as to become movable between the opening position at which it opens said opening portion and the closing position at which it closes said opening portion in response to rotation of said rotary member; and    shutter fixing means for holding said shutter member in the closed state at said closing position, a disk cartridge characterized in that said shutter member is held in the opened state at said opening position by said shutter fixing means.