JPS643828A - Optical information reproducing device - Google Patents

Optical information reproducing device

Info

Publication number
JPS643828A
JPS643828A JP15658887A JP15658887A JPS643828A JP S643828 A JPS643828 A JP S643828A JP 15658887 A JP15658887 A JP 15658887A JP 15658887 A JP15658887 A JP 15658887A JP S643828 A JPS643828 A JP S643828A
Authority
JP
Japan
Prior art keywords
signal
phase difference
pulses
width corresponding
pulse
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
JP15658887A
Other languages
Japanese (ja)
Inventor
Tomoyuki Hiroki
Hideki Tanaka
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP15658887A priority Critical patent/JPS643828A/en
Publication of JPS643828A publication Critical patent/JPS643828A/en
Pending legal-status Critical Current

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  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To perform high-accuracy, stable tracking by simple constitution by limiting pulses with width corresponding to the phase difference between reflected light detection signals from a recording medium by plural photoelectric converting elements to constant width and generating a tracking error signal. CONSTITUTION:Photodetection parts 1 and 2 detect the light intensity distribution of divided far-field patterns on an optical recording medium photoelectrically and binary detection signals S1 and S2 are outputted through waveform shaping circuits 5 and 6, etc. The signal S1 passed through an inverter 7 and the signal S2 are supplied, a D type FF 9 outputs a pulse D1 with width corresponding to the phase difference of the signal S1 from the signal S2, and a D type FF 10 outputs a pulse D2 with width corresponding to the phase difference of the signal S2 from the signal S1. Then the pulses D1 and D2 are limited to constant width values so that no excessive force is applied to monostable multivibrators 11 and 12. Those pulses M1 and M2 are processed by a differential amplifier 13 to remove offsets, and an LPF 14 generates the tracking error signal, thereby performing the high-accuracy, stable tracking by the simple constitution.
JP15658887A 1987-06-25 1987-06-25 Optical information reproducing device Pending JPS643828A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15658887A JPS643828A (en) 1987-06-25 1987-06-25 Optical information reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15658887A JPS643828A (en) 1987-06-25 1987-06-25 Optical information reproducing device

Publications (1)

Publication Number Publication Date
JPS643828A true JPS643828A (en) 1989-01-09

Family

ID=15631048

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15658887A Pending JPS643828A (en) 1987-06-25 1987-06-25 Optical information reproducing device

Country Status (1)

Country Link
JP (1) JPS643828A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008257867A (en) * 1997-02-06 2008-10-23 Matsushita Electric Ind Co Ltd Optical head device and optical information processor
US8164994B2 (en) 2005-06-27 2012-04-24 Samsung Electonics Co., Ltd. Apparatus for generating tracking signal

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008257867A (en) * 1997-02-06 2008-10-23 Matsushita Electric Ind Co Ltd Optical head device and optical information processor
US8164994B2 (en) 2005-06-27 2012-04-24 Samsung Electonics Co., Ltd. Apparatus for generating tracking signal

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