JPS6136296B2 - - Google Patents

Info

Publication number
JPS6136296B2
JPS6136296B2 JP14238878A JP14238878A JPS6136296B2 JP S6136296 B2 JPS6136296 B2 JP S6136296B2 JP 14238878 A JP14238878 A JP 14238878A JP 14238878 A JP14238878 A JP 14238878A JP S6136296 B2 JPS6136296 B2 JP S6136296B2
Authority
JP
Japan
Prior art keywords
semiconductor laser
laser light
light source
tracking error
error detection
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.)
Expired
Application number
JP14238878A
Other languages
English (en)
Japanese (ja)
Other versions
JPS5570942A (en
Inventor
Tooru Fujishima
Masanori Ogino
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 JP14238878A priority Critical patent/JPS5570942A/ja
Publication of JPS5570942A publication Critical patent/JPS5570942A/ja
Publication of JPS6136296B2 publication Critical patent/JPS6136296B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
JP14238878A 1978-11-20 1978-11-20 Tracking error detector Granted JPS5570942A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14238878A JPS5570942A (en) 1978-11-20 1978-11-20 Tracking error detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14238878A JPS5570942A (en) 1978-11-20 1978-11-20 Tracking error detector

Publications (2)

Publication Number Publication Date
JPS5570942A JPS5570942A (en) 1980-05-28
JPS6136296B2 true JPS6136296B2 (cs) 1986-08-18

Family

ID=15314195

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14238878A Granted JPS5570942A (en) 1978-11-20 1978-11-20 Tracking error detector

Country Status (1)

Country Link
JP (1) JPS5570942A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6445859A (en) * 1987-08-10 1989-02-20 Hirano Kinzoku Co Ltd Tenter type hot air treatment apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4759007A (en) * 1981-12-10 1988-07-19 Discovision Associates Storage medium track pitch detector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6445859A (en) * 1987-08-10 1989-02-20 Hirano Kinzoku Co Ltd Tenter type hot air treatment apparatus

Also Published As

Publication number Publication date
JPS5570942A (en) 1980-05-28

Similar Documents

Publication Publication Date Title
US4423496A (en) Apparatus for reading and/or writing an optically readable information structure
US4357533A (en) Focus detector for an optical disc playback system
US4498159A (en) Track deviation detecting apparatus
US5029261A (en) Apparatus for detecting position of light beam on object surface by comparing detection beams split near focal point
US5231621A (en) Focus detector which serves to split off a portion of a detected light beam only when the detected light beam is not refocused at an expected refocus point
JPH0198131A (ja) 光学型情報再生装置
JPS6136296B2 (cs)
JPH07107742B2 (ja) 光デイスクヘツドのフオーカスずれ検出装置
JPH0827961B2 (ja) ホログラム式光ヘッドの光検出器
JPS6155047B2 (cs)
JPH0734264B2 (ja) 光学式情報記録再生装置
JPH0447532A (ja) 光学式ヘッド
US5557597A (en) Focus error detector
GB2137744A (en) Optical information pickup apparatus
JPH056564A (ja) 光デイスク読取り装置におけるトラツキング誤差検出方式
JPS6232528B2 (cs)
JPS6136295B2 (cs)
JP3006987B2 (ja) 光ピックアップ
US4590594A (en) Side-spot focus apparatus for optical disc recording and/or playback system
JP2629456B2 (ja) 対物レンズ位置検出装置
JP2812764B2 (ja) 光ディスク装置用光学ヘッド
JPS58158048A (ja) トラックずれ検出装置
JPH01146138A (ja) 光学的情報記録再生装置
JPH0758551B2 (ja) 光学的情報再生装置
JPS6025033A (ja) 光学ヘツド