Abstract: Proposed is a disc recording and/or reproducing apparatus into which, of an optical disc cartridge having a cartridge main body housing an optical disc, which cartridge main body includes at least a guide section on at least one of its lateral sides along the direction of insertion into the apparatus, and a magnetic disc cartridge housing a magnetic disc of the same radius as the optical disc and having a thickness lesser than the thickness of the optical disc cartridge, only the optical disc cartridge may be loaded. The apparatus includes a loading unit for loading the optical disc cartridge onto a disc loading section, and a mistaken insertion inhibiting unit having a width broader than the thickness of the guide section of the optical disc cartridge and narrower than the thickness of the magnetic disc cartridge.

Abstract: A magneto-optical disc recording and/or reproducing apparatus has a disc cartridge loading portion on which a disc cartridge housing a magneto-optical disc is loaded. A disc rotary drive device rotates the magneto-optical disc. A disc loading mechanism loads the magneto-optic disc onto the disc rotary drive device. An optical pickup and a magnetic field generator are synchronously moveable radially with respect to the disc.

Abstract: A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing.

Abstract: A disc recording and/or reproducing apparatus includes a holding device for holding a disc cartridge which is a cartridge main body and a disc housed in the cartridge main body, a rotating and driving device for rotationally driving the disc housed within the holding device, and a positioning device provided within the rotating and driving device for positioning the disc cartridge housed within the holding device. The recording disc may be positioned highly accurately within the disc cartridge in such a manner that resonant vibrations may be prevented from being produced on the chassis.

Abstract: A disc recording and/or reproducing apparatus including a signal recording/reproducing section for recording and/or reproducing information signals on a disc 86 mm in diameter housed in a cartridge main body to form a disc cartridge, a loading mechanism for loading or unloading the disc cartridge on or from the signal recording/reproducing section and a control circuit controlling the recording/reproducing operation of the recording/reproducing section. The disc has a signal recording part divided into plural signal recording zones of substantially equal line recording density ac ross the inner and the outer peripheries of the disc. The signal recording/reproducing section, the loading mechanism and the control circuit are housed in a casing which is 101.6 mm or less in width, 150 mm or less in length and 25.4 mm or less in height and which is provided with a disc inserting opening. The apparatus may be reduced in size without decreasing the recording capacity.

Abstract: A magneto-optical disc recording and/or reproducing apparatus comprises a disc cartridge loading portion on which a disc cartridge to housing an magneto-optical disc is loaded; a disc rotary drive means for rotating the magneto-optical disc; an optical pickup which is moved in a radial direction of the magneto-optical disc for recording and/or reproducing information signals on and from the magneto-optical disc; magnetic field generating means which is disposed in a position opposite to the optical pickup with respect to the magneto-optical disc and is moved in a radial direction of the magneto-optical disc in synchronization with the movement of the optical pickup in a radial direction of the magneto-optical disc for recording informational signals on the magneto-optical disc together with the optical pickup; lifting means for moving the magnet field generating means perpendicularly toward and away from the surface of the magneto-optical disc; loading means for loading the disc cartridge upon the cartridge l

Abstract: A magneto-optical disc recording/reproducing apparatus in which a magneto-optical disc, a disc rotating and driving unit, an optical head device, an external magnetic field generating unit and a controlling device are contained as one in an outer casing.

Abstract: A disk drive apparatus includes a shutter operating pin engageable with a pin receptacle on the shutter of a disk cartridge. The shutter operating pin is carried by a shutter operating arm which is pivotable for causing a transverse shift of the shutter operating pin for shifting the shutter from a closed position, at which a disk is inaccessible, to an open position, at which the disk is accessible. An arm lock mechanism is provided for locking the shutter operating arm at the shutter fully opened position. The arm lock mechanism is provided in the cartridge holder. The cartridge holder is also provided with a cartridge lock mechanism which includes a cartridge lock pin engageable with a lock pin receptacle on the disk cartridge. The cartridge lock mechanism is actuated by means of the shutter operating arm at the shutter fully opened position, to establish locking engagement of the cartridge lock pin with the lock pin receptacle of the disk cartridge.

Abstract: A recording and/or reproducing apparatus into which a disc cartridge accommodating a disc is loaded and in which information signals are adapted to be recorded on or reproduced from the disc. A temperature sensor is provided within the apparatus for contacting with and sensing the temperature of the disc cartridge. By this temperature sensor, the temperature of the loaded disc cartridge is sensed and an output of a light source of an optical head is controlled on the basis of the sensor output to effect recording and/or reproduction of the information signals under an optimum operating state.

Abstract: A disc cartridge made up of a cartridge housing and a disc-shaped recording medium, such as an optical disc or a magneto-optical disc, accommodated in the cartridge housing, is disclosed. The cartridge housing of the disc cartridge is provided with a recording/reproducing aperture for exposing a part of the disc-shaped recording medium to the outside along the radius of the disc, and with a shutter member for opening or closing the aperture. Within a shutter opening actuating recess formed in the cartridge housing, a discriminating member associated with the type of the disc-shaped recording medium accommodated in the cartridge housing is provided for closing at least a part of the recess to prevent insertion of the disc cartridge into a recording and/or reproducing apparatus which is not suited to the type of the disc-shaped recording medium of the disc cartridge.

Abstract: A disc cartridge including a shell, a disc within the shell, a disc restraint for selectively restraining the drive may be inserted to move the restraint is provided with a cover attached to the restraint for engaging the release pin, moving the restraint in response to movement of the release pin and closing the opening to prevent the entrance of contaminants into the shell.