JPH03115947U - - Google Patents

Info

Publication number
JPH03115947U
JPH03115947U JP2534090U JP2534090U JPH03115947U JP H03115947 U JPH03115947 U JP H03115947U JP 2534090 U JP2534090 U JP 2534090U JP 2534090 U JP2534090 U JP 2534090U JP H03115947 U JPH03115947 U JP H03115947U
Authority
JP
Japan
Prior art keywords
disc
fixing
turntable
detects
magnetic field
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2534090U
Other languages
Japanese (ja)
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed filed Critical
Priority to JP2534090U priority Critical patent/JPH03115947U/ja
Publication of JPH03115947U publication Critical patent/JPH03115947U/ja
Pending legal-status Critical Current

Links

Description

【図面の簡単な説明】[Brief explanation of drawings]

第１図は、一実施例の制御回路の要部の構成を
示すブロツク図、第２図は、デイスク固定用マグ
ネツトの磁化状態を示す図、第３図は、従来例の
制御回路の要部の構成を示すブロツク図、第４図
は、その回転検出用円板を示す図である。 １……ターンテーブル、２……光デイスク、３
……デイスク固定用マグネツト、４……光ピツク
アツプ、５……信号処理回路、６……スピンモー
タ駆動回路、７……スピンモータ、１１……磁気
検出器。 FIG. 1 is a block diagram showing the configuration of the main part of the control circuit of one embodiment, FIG. 2 is a diagram showing the magnetization state of the disk fixing magnet, and FIG. 3 is the main part of the control circuit of the conventional example. FIG. 4 is a block diagram illustrating the configuration of the rotation detecting disk. 1... Turntable, 2... Optical disk, 3
... Disc fixing magnet, 4... Optical pickup, 5... Signal processing circuit, 6... Spin motor drive circuit, 7... Spin motor, 11... Magnetic detector.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] ターンテーブルにデイスクを固定するためのデ
イスク固定用マグネツトの磁界を検出し、この検
出結果からデイスクの回転制御用の回転情報を得
ることを特徴とする光デイスク再生装置。 1. An optical disc playback device that detects the magnetic field of a disc fixing magnet for fixing the disc to a turntable, and obtains rotation information for disc rotation control from the detection result.
JP2534090U 1990-03-12 1990-03-12 Pending JPH03115947U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2534090U JPH03115947U (en) 1990-03-12 1990-03-12

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2534090U JPH03115947U (en) 1990-03-12 1990-03-12

Publications (1)

Publication Number Publication Date
JPH03115947U true JPH03115947U (en) 1991-12-02

Family

ID=31528274

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2534090U Pending JPH03115947U (en) 1990-03-12 1990-03-12

Country Status (1)

Country Link
JP (1) JPH03115947U (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6222751B2 (en) * 1977-02-02 1987-05-19 Pilgrim Eng Dev
JPS6464165A (en) * 1987-09-04 1989-03-10 Fuji Electric Co Ltd Disk driving use spindle motor
JPS6480869A (en) * 1987-09-24 1989-03-27 Hitachi Ltd Detecting mechanism for rotating speed of disk

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6222751B2 (en) * 1977-02-02 1987-05-19 Pilgrim Eng Dev
JPS6464165A (en) * 1987-09-04 1989-03-10 Fuji Electric Co Ltd Disk driving use spindle motor
JPS6480869A (en) * 1987-09-24 1989-03-27 Hitachi Ltd Detecting mechanism for rotating speed of disk

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