Abstract: A method for establishing a code on a time card includes the step of selecting that day, among numerical figures representing dates printed in a date column on the time card, which is equal to an ID code number of a card user, and the step of applying a code read mark in the day indication column, thereby forming the ID code of the card user on the time card. A time recorder equipped with a code judgment function is also disclosed.

Abstract: A magneto-optical recording and reproducing device in which recording is carried out by applying a modulated laser beam and a bias magnetic field to a recording point of a magneto-optical recording disc and erasing is carried out by reversing a direction of the bias magnetic field and continuously applying a laser beam to the recording point. The device includes an electromagnet (2) for applying the bias magnetic field, a carriage (3) on which a laser for irradiating the laser beam is mounted, an actuator including magnets (4) and coils (5) for controlling the focal point of the laser beam, a linear motor including magnets (7), yokes (8) and coils (6) for linearly moving the carriage (3). In one embodiment, the polarities of the magnets (4, 7) of the actuator and linear motor, respectively, are arranged such that a direction of the magnetic field of the actuator is opposite to that of the linear motor so as to minimize the resulting magnetic flux.

Abstract: A playback/recording apparatus for a cartridge-contained disk includes a casing having a slot, a cartridge holder having an opening aligned with the slot, a conveyance mechanism for moving the cartridge holder and cartridge therein between a fully inserted position of the cartridge and a playback/recording position, and a playback/recording mechanism for recording on or reproducing from the disk. The apparatus has resilient members, mounted on the holder, for engaging with the cartridge after insertion. The resilient members are capable of being reciprocated in the directions of insertion and discharge of the cartridge. Stoppers limit the ranges of the reciprocation of the resilient members. During insertion of the cartridge, the resilient members engage with the cartridge and come into contact with recesses in the cartridge. An urging mechanism urges the cartridge toward the outside of a slot.

Abstract: An apparatus for playing a disc rotatably stored in a flat protective cartridge has guide pins slidably fitted in guide holes for guiding a holding member that holds the cartridge loaded in a housing toward a turntable. The cartridge can be transferred from a loading/unloading slot toward the turntable with high accuracy. With the arrangement in which the holding member is guided by the guide pins and the guide holes, the apparatus is small in size and the holding member is moved smoothly with a high accuracy thereby to perform smooth loading the cartridge-stored disc while keeping accurate alignment of the disc against the spindle of the turn-table.