JPS573231A - Optical reproducer - Google Patents

Optical reproducer

Info

Publication number
JPS573231A
JPS573231A JP7609380A JP7609380A JPS573231A JP S573231 A JPS573231 A JP S573231A JP 7609380 A JP7609380 A JP 7609380A JP 7609380 A JP7609380 A JP 7609380A JP S573231 A JPS573231 A JP S573231A
Authority
JP
Japan
Prior art keywords
circuit
output
reference voltage
oscillator
inputted
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
JP7609380A
Other languages
Japanese (ja)
Other versions
JPS6152533B2 (en
Inventor
Tadao Nagai
Masao Uehara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Teac Corp
Original Assignee
Teac Corp
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 Teac Corp filed Critical Teac Corp
Priority to JP7609380A priority Critical patent/JPS573231A/en
Publication of JPS573231A publication Critical patent/JPS573231A/en
Publication of JPS6152533B2 publication Critical patent/JPS6152533B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To exercise highly precise control by canceling a change in oscillation due to fluctuations of temperature, etc., by providing a servocontrol circuit which holds constant a component with a frequency twice the oscillation frequency of a signal obtained by a beam detector. CONSTITUTION:The reflected beam 18 of a beam 2 incident to a track on a disk 1 is detected by photodetector 19 and inputted to an amplifier 22. Its output is inputted to a correcting circuit 33 via a BPF32 for a frequency 2fomega twice that of the output signal. The output of the amplifier 22, on the other hand, is inputted to a comparator 39 via an envelope detecting circuit 37 and an LPF38 and compared with a reference voltage from a reference voltage circuit 40, thereby controlling the correcting circuit 33 by the difference output. The output of the circuit is passed through the envelope detecting circuit 34 and an LPF35 and compared by a level comparing circuit 36 with a reference voltage from a reference voltage circuit 41 to correct the output of an oscillator 30 by inputting the output of the comparator to a level adjusting circuit 31a, thereby supplying the output of the oscillator to a beam spot oscillator. Thus influences of fluctuations of temperature, etc., are canceled easily to exercise highly precise control.
JP7609380A 1980-06-06 1980-06-06 Optical reproducer Granted JPS573231A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7609380A JPS573231A (en) 1980-06-06 1980-06-06 Optical reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7609380A JPS573231A (en) 1980-06-06 1980-06-06 Optical reproducer

Publications (2)

Publication Number Publication Date
JPS573231A true JPS573231A (en) 1982-01-08
JPS6152533B2 JPS6152533B2 (en) 1986-11-13

Family

ID=13595225

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7609380A Granted JPS573231A (en) 1980-06-06 1980-06-06 Optical reproducer

Country Status (1)

Country Link
JP (1) JPS573231A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007537556A (en) * 2004-05-12 2007-12-20 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Improved servo system, record carrier and playback device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007537556A (en) * 2004-05-12 2007-12-20 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Improved servo system, record carrier and playback device

Also Published As

Publication number Publication date
JPS6152533B2 (en) 1986-11-13

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