Recording medium cartridge with a twin-coiled torsional spring-biased shutter

A cartridge for accommodating a recording medium, which cartridge comprises:

• a housing having a medium chamber defined therein for accommodating the recording medium, said housing having at least one access opening defined therein;
• a slide shutter slidably mounted on the housing for movement between an opened position in which the access opening is opened and a closed position in which the access opening is closed;
• and
• a biasing member for biasing the slide shutter towards the closed position, said biasing member comprising a twin-coiled torsional spring including first and second coils connected together by a bridge and first and second spring arms extending outwardly from the first and second coils, respectively, said first spring arm having a free end engaged to the slide shutter and said second spring arm having a free end engaged to a portion of the housing,
• wherein the recording medium is a length of magnetic recording tape, and further comprising a single reel around which the length of magnetic recording tape is wound with one of opposite ends thereof anchored to the reel, said reel being housed rotatably within the medium chamber;
• a generally elongated retainer member to which the other of the opposite ends of the magnetic recording tape is anchored;
• and a holder for holding the retainer member at a retracted position inside the housing adjacent the access opening when the slide shutter is in the closed position.