Disc cartridge having a shutter

A shutter for covering a head insertion opening of a disc cartridge, the shutter comprising:

• a closure section that covers the head insertion opening on the disc cartridge when the shutter is in a closed position;
• a frictional contacting section that frictionally contacts a portion of the disc cartridge;
• and
• a connecting section having a locking lug and interconnecting the closure section and the frictional contacting section, the locking lug engaging a locking recess of a shutter locking member when the closure section is in the closed position,
• wherein the closure section, the frictional contacting section, and the connecting section are formed as one piece.

A disc cartridge for accommodating a disc-shaped optical recording medium having a hub, the disc cartridge comprising:

• a cartridge main body having a centering opening that exposes the hub of the optical recording medium to the outside, a head insertion opening that radially exposes a portion of the optical recording medium to the outside, and a longitudinal groove with a lock opening that guides an external shutter-opening member, the longitudinal groove having an opening end on a side of the cartridge main body normal to a sliding direction of the shutter and being formed on a front side of the cartridge main body extending parallel to the sliding direction of the shutter;
• a shutter having a locking lug and being slidably mounted on the cartridge main body between an open position and a closed position, the shutter exposing the head insertion opening and a portion of the longitudinal groove to the outside when in the open position, the shutter covering the head insertion opening and the portion of the longitudinal groove when in the closed position;
• a resilient flexible shutter locking member movable between a locked position and an unlocked position having a locking projection and a locking recess and being connected to the cartridge main body, the locking projection extending into the lock opening, the locking recess engaging the locking lug and locking the shutter in the closed position when in the locked position, the locking recess disengaging the locking lug and unlocking the shutter in the unlocked position;
• and
• mistaken recording inhibiting means for indicating whether information can be recorded on the disc cartridge provided at a corner on a major surface of the cartridge main body on a side parallel to the front surface of the cartridge main body provided with the longitudinal groove.

A disc cartridge for accommodating a disc-shaped optical recording medium having a hub, the disc cartridge comprising:

• a cartridge main body having a centering opening that exposes the hub of the optical recording medium to the outside, a head insertion opening that radially exposes a portion of the optical recording medium to the outside, and a longitudinal groove with a lock opening that guides an external shutter-opening member;
• a shutter having a locking lug and being slidably mounted on the cartridge main body between an open position and a closed position, the shutter exposing the head insertion opening and a portion of the longitudinal groove to the outside when in the open position, the shutter covering the head insertion opening and the portion of the longitudinal groove when in the closed position;
• a resilient flexible shutter locking member movable between a locked position and an unlocked position having a locking projection and a locking recess and being connected to the cartridge main body, the locking projection extending into the lock opening, the locking recess engaging the locking lug and locking the shutter in the closed position when in the locked position, the locking recess disengaging the locking lug and unlocking the shutter in the unlocked position;
• and
• a mistaken recording inhibiting member mounted on the cartridge main body for movement in a direction normal to the direction of thickness of the recording medium, the mistaken recording inhibiting member including:
• a main body for opening or closing a detecting hole that indicates the recordability or non-recordability of information signals on the recording medium,
• an operating lug formed integrally with the main body so that a part of the operating lug is exposed to the outside via an operating window provided in a side of the cartridge main body,
• a controlling section for controlling the movement of the main body between an open position and a closed position, the open position corresponding to an open detecting hole, the closed corresponding to a closed detecting hole.

A disc cartridge for accommodating a disc-shaped optical recording medium having a hub, the disc cartridge comprising:

• a cartridge main body having a centering opening that exposes the hub of the optical recording medium to the outside, a head insertion opening that radially exposes a portion of the optical recording medium to the outside, and a longitudinal groove with a lock opening that guides an external shutter-opening member;
• a shutter having a locking lug and being slidably mounted on the cartridge main body between an open position and a closed position, the shutter exposing the head insertion opening and a portion of the longitudinal groove to the outside when in the open position, the shutter covering the head insertion opening and the portion of the longitudinal groove when in the closed position;
• a resilient flexible shutter locking member movable between a locked position and an unlocked position having a locking projection and a locking recess and being connected to the cartridge main body, the locking projection extending into the lock opening, the locking recess engaging the locking lug and locking the shutter in the closed position when in the locked position, the locking recess disengaging the locking lug and unlocking the shutter in the unlocked position;
• discriminating means provided in a major surface of the cartridge main body for discriminating the type of optical recording medium;
• and
• a mistaken recording inhibiting member provided in the major surface of the cartridge main body for indicating recordability or non-recordability of information signals on the optical recording medium.