JPS5890536U - automatic focus adjustment device - Google Patents

automatic focus adjustment device

Info

Publication number
JPS5890536U
JPS5890536U JP18561781U JP18561781U JPS5890536U JP S5890536 U JPS5890536 U JP S5890536U JP 18561781 U JP18561781 U JP 18561781U JP 18561781 U JP18561781 U JP 18561781U JP S5890536 U JPS5890536 U JP S5890536U
Authority
JP
Japan
Prior art keywords
objective lens
optical recording
movable coil
adjustment device
focus adjustment
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.)
Granted
Application number
JP18561781U
Other languages
Japanese (ja)
Other versions
JPS6245297Y2 (en
Inventor
恵介 伊藤
菅野　隆文
宝来　慶一郎
Original Assignee
松下電器産業株式会社
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 by 松下電器産業株式会社 filed Critical 松下電器産業株式会社
Priority to JP18561781U priority Critical patent/JPS5890536U/en
Publication of JPS5890536U publication Critical patent/JPS5890536U/en
Application granted granted Critical
Publication of JPS6245297Y2 publication Critical patent/JPS6245297Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Manufacturing Optical Record Carriers (AREA)

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

第１図は従来例を示す構成図、第２図及び第３図は本考
案の第１及び第２実施例を示す構成図である。 １・・・可動コイル、２・・・対物レンズ、３・・・ガ
ラス記録原盤、４・・・レーザ光源、５・・・出射光、
７・・・フォトディテクター、８・・・フォーカスサー
ボ回路、１２・・・偏光ビームスプリッタ、１４・・・
グイクロックミラー、１７・・・フォトディテクター、
１８・・・モーター、１９・・・フォトディテクター。FIG. 1 is a block diagram showing a conventional example, and FIGS. 2 and 3 are block diagrams showing first and second embodiments of the present invention. DESCRIPTION OF SYMBOLS 1... Moving coil, 2... Objective lens, 3... Glass recording master, 4... Laser light source, 5... Outgoing light,
7... Photodetector, 8... Focus servo circuit, 12... Polarizing beam splitter, 14...
Guiclock Mirror, 17... Photodetector,
18...Motor, 19...Photodetector.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] レーザ光線と、光学記録原盤に対向配置された対物レン
ズを備えた可動コイルと、前記光学記録原盤と対物レン
ズの相対距離の焦点位置に対する変化分を前記レーザ光
源からのレーザを用いて検出しその検出信号に基づき前
記対物し１ズを備えた可動コイルを前記相対距離が焦点
位置に一致するように制御する手段と、前記可動コイル
を制御領域内へ電磁駆動するモーターと、前記レーザ光
源から前記光学記録原盤への入射光路に沿う少なくとも
一箇所において設けられ前記レーザ光源よりの出射光の
有無を検出し前記モータを制御する手段とを備えた自動
焦点調整装置。A movable coil equipped with a laser beam and an objective lens arranged opposite to the optical recording master disk, and a change in the relative distance between the optical recording master disk and the objective lens with respect to the focal position are detected using a laser beam from the laser light source. means for controlling the movable coil provided with the objective lens so that the relative distance coincides with the focal position based on the detection signal; a motor for electromagnetically driving the movable coil into a control area; An automatic focus adjustment device comprising means for detecting the presence or absence of light emitted from the laser light source and controlling the motor, the means being provided at at least one location along the optical path of incidence on the optical recording master.
JP18561781U 1981-12-11 1981-12-11 automatic focus adjustment device Granted JPS5890536U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP18561781U JPS5890536U (en) 1981-12-11 1981-12-11 automatic focus adjustment device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18561781U JPS5890536U (en) 1981-12-11 1981-12-11 automatic focus adjustment device

Publications (2)

Publication Number Publication Date
JPS5890536U true JPS5890536U (en) 1983-06-18
JPS6245297Y2 JPS6245297Y2 (en) 1987-12-03

Family

ID=29986831

Family Applications (1)

Application Number Title Priority Date Filing Date
JP18561781U Granted JPS5890536U (en) 1981-12-11 1981-12-11 automatic focus adjustment device

Country Status (1)

Country Link
JP (1) JPS5890536U (en)

Also Published As

Publication number Publication date
JPS6245297Y2 (en) 1987-12-03

Similar Documents

Publication Publication Date Title
JPS57130240A (en) Optical information recording and reproducing device and information recording medium for it
EP0260569A2 (en) Optical pick-up device
JPS61111036U (en)
JPS5890536U (en) automatic focus adjustment device
JPS6318354B2 (en)
JPS55101142A (en) Focus detection unit of optical reproducing device
JPS59125727U (en) Optical information pickup device
JPS621141A (en) Optical head
JPS567245A (en) Automatic focusing unit in optical information reproducing device
JPS6025033A (en) Optical head
JPS6055890B2 (en) Optical information recording and reproducing device
JP2558405Y2 (en) Objective lens drive
JPH01154527U (en)
JPH01155504A (en) Controller for external magnetic field of magneto-optical disk device
JPS59157224U (en) Irradiation beam control device
JPS60127630U (en) Recorded information reproducing device
JPH01154528U (en)
JPS60183918U (en) disk player
JPH02105337A (en) Focus position control method for objective lens
JPH02267745A (en) Optical head device
JPH03130018U (en)
JPS6432434A (en) Optical information recording and reproducing device
JPH0371417U (en)
JPS59157223U (en) Optical pickup device
JPH0296619U (en)