JPS5769534A - Optical track tracing device - Google Patents

Optical track tracing device

Info

Publication number
JPS5769534A
JPS5769534A JP55142910A JP14291080A JPS5769534A JP S5769534 A JPS5769534 A JP S5769534A JP 55142910 A JP55142910 A JP 55142910A JP 14291080 A JP14291080 A JP 14291080A JP S5769534 A JPS5769534 A JP S5769534A
Authority
JP
Japan
Prior art keywords
diffracted light
tracks
parts
photodetector
light
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
JP55142910A
Other languages
Japanese (ja)
Other versions
JPH0210491B2 (en
Inventor
Toshimitsu Miyauchi
Seiji Yonezawa
Toshio Sugiyama
Masateru Watanabe
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP55142910A priority Critical patent/JPS5769534A/en
Publication of JPS5769534A publication Critical patent/JPS5769534A/en
Publication of JPH0210491B2 publication Critical patent/JPH0210491B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE:To reduce the deviation signal due to beam deflection to trace tracks accurately, by providing two photodetecting parts, at least, which detect only light components other than 0-order light components in the photodetector which receives the diffracted light from information tracks. CONSTITUTION:A photodetector 7 consists of photodetecting parts D1 and D2 and a dark part B and has symmetrical axis O arranged in parallel with tracks approximately. The O-order diffracted light of the diffracted light of tracks is irradiated to the dark part B. The primary diffracted light is detected but the 0-order diffracted light is not detected by photodetecting parts D1 and D2. The difference between output signals of parts D1 and D2 becomes a track control signal. Consequently, the deviation signal due to beam deflection is reduced to make an accurate track tracking possible.
JP55142910A 1980-10-15 1980-10-15 Optical track tracing device Granted JPS5769534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55142910A JPS5769534A (en) 1980-10-15 1980-10-15 Optical track tracing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55142910A JPS5769534A (en) 1980-10-15 1980-10-15 Optical track tracing device

Publications (2)

Publication Number Publication Date
JPS5769534A true JPS5769534A (en) 1982-04-28
JPH0210491B2 JPH0210491B2 (en) 1990-03-08

Family

ID=15326452

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55142910A Granted JPS5769534A (en) 1980-10-15 1980-10-15 Optical track tracing device

Country Status (1)

Country Link
JP (1) JPS5769534A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61216143A (en) * 1985-03-20 1986-09-25 Matsushita Electric Ind Co Ltd Optical head
US5617389A (en) * 1993-06-08 1997-04-01 Pioneer Electronic Corporation Method of reproducing information of optical disc, method of recording and reproducing the same, apparatus for reproducing the same, and light detecting apparatus used in the reproducing apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4960702A (en) * 1972-08-25 1974-06-12
JPS502569A (en) * 1973-03-02 1975-01-11
JPS51134018A (en) * 1975-05-16 1976-11-20 Hitachi Ltd Information regeneration method
JPS5465007A (en) * 1977-11-02 1979-05-25 Matsushita Electric Ind Co Ltd Disc form recording carrier reader

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4960702A (en) * 1972-08-25 1974-06-12
JPS502569A (en) * 1973-03-02 1975-01-11
JPS51134018A (en) * 1975-05-16 1976-11-20 Hitachi Ltd Information regeneration method
JPS5465007A (en) * 1977-11-02 1979-05-25 Matsushita Electric Ind Co Ltd Disc form recording carrier reader

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61216143A (en) * 1985-03-20 1986-09-25 Matsushita Electric Ind Co Ltd Optical head
US5617389A (en) * 1993-06-08 1997-04-01 Pioneer Electronic Corporation Method of reproducing information of optical disc, method of recording and reproducing the same, apparatus for reproducing the same, and light detecting apparatus used in the reproducing apparatus

Also Published As

Publication number Publication date
JPH0210491B2 (en) 1990-03-08

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