JPH0371411U

JPH0371411U -

Info

Publication number: JPH0371411U
Application number: JP12939289U
Authority: JP
Priority date: 1989-11-06
Filing date: 1989-11-06
Publication date: 1991-07-19

Description

[Brief explanation of drawings]

第１図は本考案の光学式デイスクプレーヤの要
部の概略回路構成図である。第２図は従来のプレ
ーヤのターンテーブルとデイスクの関係を示す構
成図であり、第３図はこのターンテーブルを回転
させるモータとそのモータを回転制御する回路の
回路図である。第４図は従来回路の動作説明のた
めの波形図である。第５図は本考案のプレーヤの
部分構成図である。第６図は第１図の回路の動作
を説明するための波形図である。１……ターンテーブル、２……モータ、３……
ピツクアツプ手段、４……装填認識手段、５……
モータ制御手段、６……テーブル部、７……貫通
孔、８……係合凸部、９……自動調芯、１０……
マイコン、１１……フオーカス信号形成回路、１
２……スピンドル信号形成回路、１３……モータ
駆動回路、１４……電源、１５……第１トランジ
スタ、１６……時定数回路、１７……ボリウム、
１８……第２トランジスタ、３０……デイスクで
ある。 FIG. 1 is a schematic circuit diagram of the main parts of the optical disc player of the present invention. FIG. 2 is a block diagram showing the relationship between a turntable and a disk in a conventional player, and FIG. 3 is a circuit diagram of a motor that rotates the turntable and a circuit that controls the rotation of the motor. FIG. 4 is a waveform diagram for explaining the operation of the conventional circuit. FIG. 5 is a partial configuration diagram of the player of the present invention. FIG. 6 is a waveform diagram for explaining the operation of the circuit of FIG. 1. 1... Turntable, 2... Motor, 3...
Pick-up means, 4... Loading recognition means, 5...
Motor control means, 6...Table portion, 7...Through hole, 8...Engagement convex portion, 9...Automatic alignment, 10...
Microcomputer, 11... Focus signal forming circuit, 1
2... Spindle signal forming circuit, 13... Motor drive circuit, 14... Power supply, 15... First transistor, 16... Time constant circuit, 17... Volume,
18... second transistor, 30... disk.

Claims

[Scope of utility model registration request]

A turntable having a table portion on which a disk having a through hole in the center is placed, an engaging convex portion that engages with the through hole, a motor that rotationally drives the turntable, and an optical device that optically reads information on the disk. a pickup means having a focus control mechanism; a loading recognition means for recognizing whether or not a disc is loaded on the turntable and outputting a recognition signal when the disc is loaded; An optical disc player comprising a circuit for forming a focus signal and a spindle signal that operates based on the focus signal, and a motor control means for forming a control signal for controlling the motor,
The motor control means rotates the motor a little based on the recognition signal before the spindle signal forming circuit forms the spindle signal, and causes the engagement protrusion of the turntable to engage with the through hole of the disk. An optical disc player characterized by comprising means for ensuring that.