JPS61156061U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a circuit block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram of waveforms of the main parts thereof. 1... Video disc record, 4... Pickup, 8... Comparison circuit, 18... Playback signal detection circuit, 19... Disc identification circuit.

Claims (1)

[Claims for Utility Model Registration] A first video disc record in which a recording track with a constant angular velocity is formed in a spiral shape outward, and a recording track with a constant linear velocity from the inside compared to the first video disc record. In a video disc player that plays back a second video disc record in which tracks are recorded in a spiral manner outwards, a comparison circuit that compares the phase of synchronization information included in the playback signal and a reference signal; a disk motor drive circuit that controls the rotation of the disk motor based on a circuit output; a startup completion detection circuit that outputs a startup completion detection circuit output when the disk motor reaches a predetermined rotational speed; and a reproduction signal when a reproduction signal is generated. a reproduction signal detection circuit that generates a detection output; a disk identification circuit that detects that the reproduction signal detection output is not generated when the startup completion detection output is generated and generates a disk identification output;
A pick-up access circuit for a video disc player, comprising pick-up transfer means which are arranged opposite to the start end of a recording track of a disc record and forcibly transport the pick-up to the outside of the disc when the disc identification output is generated.