JPS55157135A - Information reader - Google Patents

Information reader

Info

Publication number
JPS55157135A
JPS55157135A JP6144379A JP6144379A JPS55157135A JP S55157135 A JPS55157135 A JP S55157135A JP 6144379 A JP6144379 A JP 6144379A JP 6144379 A JP6144379 A JP 6144379A JP S55157135 A JPS55157135 A JP S55157135A
Authority
JP
Japan
Prior art keywords
signal
recording medium
light beam
splitter
separated
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
JP6144379A
Other languages
English (en)
Japanese (ja)
Other versions
JPS6223378B2 (enrdf_load_stackoverflow
Inventor
Kazuo Shigematsu
Manabu Yamamoto
Masahiro Oshima
Kiichi Kamiyanagi
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 JP6144379A priority Critical patent/JPS55157135A/ja
Publication of JPS55157135A publication Critical patent/JPS55157135A/ja
Publication of JPS6223378B2 publication Critical patent/JPS6223378B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)
JP6144379A 1979-05-21 1979-05-21 Information reader Granted JPS55157135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6144379A JPS55157135A (en) 1979-05-21 1979-05-21 Information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6144379A JPS55157135A (en) 1979-05-21 1979-05-21 Information reader

Publications (2)

Publication Number Publication Date
JPS55157135A true JPS55157135A (en) 1980-12-06
JPS6223378B2 JPS6223378B2 (enrdf_load_stackoverflow) 1987-05-22

Family

ID=13171204

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6144379A Granted JPS55157135A (en) 1979-05-21 1979-05-21 Information reader

Country Status (1)

Country Link
JP (1) JPS55157135A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59127243A (ja) * 1983-01-11 1984-07-23 Matsushita Electric Ind Co Ltd 光学的記録再生装置
JPH02192042A (ja) * 1989-01-19 1990-07-27 Nec Corp 光ディスク装置
JPH0426940A (ja) * 1990-05-21 1992-01-30 Matsushita Electric Ind Co Ltd 光ディスク原盤作製装置
JPH06203398A (ja) * 1981-03-31 1994-07-22 Discovision Assoc トラッキング装置
JP2019523403A (ja) * 2016-07-29 2019-08-22 シャンハイ マイクロ エレクトロニクス イクイプメント（グループ）カンパニー リミティド 回折格子測定装置

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295203A (en) * 1976-02-05 1977-08-10 Mitsubishi Electric Corp Information reproduction apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5295203A (en) * 1976-02-05 1977-08-10 Mitsubishi Electric Corp Information reproduction apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06203398A (ja) * 1981-03-31 1994-07-22 Discovision Assoc トラッキング装置
JPS59127243A (ja) * 1983-01-11 1984-07-23 Matsushita Electric Ind Co Ltd 光学的記録再生装置
JPH02192042A (ja) * 1989-01-19 1990-07-27 Nec Corp 光ディスク装置
JPH0426940A (ja) * 1990-05-21 1992-01-30 Matsushita Electric Ind Co Ltd 光ディスク原盤作製装置
JP2019523403A (ja) * 2016-07-29 2019-08-22 シャンハイ マイクロ エレクトロニクス イクイプメント（グループ）カンパニー リミティド 回折格子測定装置

Also Published As

Publication number Publication date
JPS6223378B2 (enrdf_load_stackoverflow) 1987-05-22

Similar Documents

Publication Publication Date Title
CA2007619A1 (en) Optical pickup apparatus utilizing a diffraction device
EP0283002A3 (en) Optical head
JPS57208642A (en) Focus controller
JPS54128303A (en) Optical reproducing device of information recording medium disc
EP0392775A3 (en) A detrack detecting system in an optical recording/reproducing apparatus
JPS55157135A (en) Information reader
EP0348221A3 (en) An optical pickup apparatus
AU572750B2 (en) Reading an optical disk
EP0391691A3 (en) Optical recording and reproducing appparatus
MY106732A (en) Optical recording and/or reproducing apparatus.
JPS5534340A (en) Recording reproducing system by light beam
JPS55125417A (en) Photodetector
EP0347081A3 (en) Optical head devices for use in recording and/or reproduction of information
JPS54125005A (en) Optical reading method
JPS5647931A (en) Optical recording and reproducing device
JPS5555445A (en) Optical recording information reproducing device
JPS6462838A (en) Optical pick-up
JPS56145532A (en) Optical information recording and reproducing device
JPS5439103A (en) Medium locator for fucus servo
JPS5532245A (en) Optical recorder and reproducing device
JPS5764336A (en) Track signal recording system of optical disk device
SU1203583A1 (ru) Устройство дл позиционировани пучка излучени при оптическом воспроизведении информации
JPS57200961A (en) Reader in optical magnetic disk recording and reproducing system
CA2014163A1 (en) Optical recording and reproducing apparatus
JPS5771531A (en) Track signal recording system of optical disc device