JPS5619176A - Optical information reader - Google Patents

Optical information reader

Info

Publication number
JPS5619176A
JPS5619176A JP9627379A JP9627379A JPS5619176A JP S5619176 A JPS5619176 A JP S5619176A JP 9627379 A JP9627379 A JP 9627379A JP 9627379 A JP9627379 A JP 9627379A JP S5619176 A JPS5619176 A JP S5619176A
Authority
JP
Japan
Prior art keywords
polarization
read
reflected
polarized
splitter
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
JP9627379A
Other languages
Japanese (ja)
Other versions
JPS6215936B2 (en
Inventor
Noriaki Tsukada
Ikuyuki Miyazawa
Kazuo Okada
Hiroshi Sugawara
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP9627379A priority Critical patent/JPS5619176A/en
Publication of JPS5619176A publication Critical patent/JPS5619176A/en
Publication of JPS6215936B2 publication Critical patent/JPS6215936B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To enable the read-in of high sensitivity with low output laser, by enabling the read-in of stright line polarization and realizing the input and refrected light separation, in the optical information reader using semiconductor laser.
CONSTITUTION: The output beam from the semiconductor laser 1 is made parallel at the lens 3 and it is fed to the Farady element 10 through the polarization splitter 8. Further, the beam polarized by 45° at the element 10 is fed to the information recording carrier 15 and further reflected with fine rotation toward polarization corresponding to the recorded information. This reflected light is again subject to the 45° polarized rotation at the element 10, and is advances toward the polarization orthogonal to the polarization of laser radiated light and fully reflected at the splitter 8. After the polarization characteristics of the reflected beam is differentially detected at the polarized beam splitter 11, it is differentially amplified 14 via the photo detectors 12, 13. Thus, the change in fine rotation toward polarization of readout beam is read in as the information of the carrier 15 and the incoming and reflection split is realized, allowing to perform the read-in of high sensitivity with low output laser.
COPYRIGHT: (C)1981,JPO&Japio
JP9627379A 1979-07-25 1979-07-25 Optical information reader Granted JPS5619176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9627379A JPS5619176A (en) 1979-07-25 1979-07-25 Optical information reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9627379A JPS5619176A (en) 1979-07-25 1979-07-25 Optical information reader

Publications (2)

Publication Number Publication Date
JPS5619176A true JPS5619176A (en) 1981-02-23
JPS6215936B2 JPS6215936B2 (en) 1987-04-09

Family

ID=14160528

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9627379A Granted JPS5619176A (en) 1979-07-25 1979-07-25 Optical information reader

Country Status (1)

Country Link
JP (1) JPS5619176A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5755547A (en) * 1980-09-22 1982-04-02 Olympus Optical Co Ltd Information reader of photomagnetic recording medium
JPS57133537A (en) * 1981-02-06 1982-08-18 Sharp Corp Magnetic and optical recording and reproducing head
JPS57169947A (en) * 1981-04-14 1982-10-19 Sharp Corp Magnetic optical head
JPS59119730U (en) * 1983-01-29 1984-08-13 三菱重工業株式会社 Intermediate joint for oil-immersed wiring
JPS59168951A (en) * 1983-03-16 1984-09-22 Sanyo Electric Co Ltd Optical magnetic disc device
JPS6064424U (en) * 1983-10-05 1985-05-07 三洋電機株式会社 magneto-optical disk device
JPS6122449A (en) * 1984-07-10 1986-01-31 Matsushita Electric Ind Co Ltd Optical pickup
US4964110A (en) * 1987-05-28 1990-10-16 Sony Corporation Apparatus for reproducing a magneto-optical disk using a shot noise reduction circuit
JPH0316500A (en) * 1989-06-14 1991-01-24 Hitachi Ltd Voice output volume interlocking with headphone output
JPH08212615A (en) * 1995-12-13 1996-08-20 Sharp Corp Optical device of magneto-optical storage device
US6049518A (en) * 1995-08-31 2000-04-11 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0642151U (en) * 1992-11-26 1994-06-03 株式会社タナカヤ Partially stuck cardboard sheet

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625617A (en) * 1970-07-15 1971-12-07 Honeywell Inc Kerr effect read-out system for an optical memory
US4101947A (en) * 1976-10-04 1978-07-18 Eastman Kodak Company Narrow track magnetic-head recorder
JPS53112039A (en) * 1977-03-09 1978-09-30 Philips Nv Optical memory for mechanically addressing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3625617A (en) * 1970-07-15 1971-12-07 Honeywell Inc Kerr effect read-out system for an optical memory
US4101947A (en) * 1976-10-04 1978-07-18 Eastman Kodak Company Narrow track magnetic-head recorder
JPS53112039A (en) * 1977-03-09 1978-09-30 Philips Nv Optical memory for mechanically addressing

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0115932B2 (en) * 1980-09-22 1989-03-22 Olympus Optical Co
JPS5755547A (en) * 1980-09-22 1982-04-02 Olympus Optical Co Ltd Information reader of photomagnetic recording medium
JPS57133537A (en) * 1981-02-06 1982-08-18 Sharp Corp Magnetic and optical recording and reproducing head
JPH034976B2 (en) * 1981-04-14 1991-01-24 Sharp Kk
JPS57169947A (en) * 1981-04-14 1982-10-19 Sharp Corp Magnetic optical head
JPS59119730U (en) * 1983-01-29 1984-08-13 三菱重工業株式会社 Intermediate joint for oil-immersed wiring
JPS59168951A (en) * 1983-03-16 1984-09-22 Sanyo Electric Co Ltd Optical magnetic disc device
JPS6064424U (en) * 1983-10-05 1985-05-07 三洋電機株式会社 magneto-optical disk device
JPS6122449A (en) * 1984-07-10 1986-01-31 Matsushita Electric Ind Co Ltd Optical pickup
US4964110A (en) * 1987-05-28 1990-10-16 Sony Corporation Apparatus for reproducing a magneto-optical disk using a shot noise reduction circuit
JPH0316500A (en) * 1989-06-14 1991-01-24 Hitachi Ltd Voice output volume interlocking with headphone output
US6049518A (en) * 1995-08-31 2000-04-11 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
US6122242A (en) * 1995-08-31 2000-09-19 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
US6137764A (en) * 1995-08-31 2000-10-24 Sanyo Electric Co., Ltd. Optical disc recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
US6167019A (en) * 1995-08-31 2000-12-26 Sanyo Electric Co., Ltd. Optical Disc cd recording/reproducing apparatus recording/reproducing information to/from optical discs according to different standards
JPH08212615A (en) * 1995-12-13 1996-08-20 Sharp Corp Optical device of magneto-optical storage device

Also Published As

Publication number Publication date
JPS6215936B2 (en) 1987-04-09

Similar Documents

Publication Publication Date Title
JPS5263614A (en) Information detector
JPS5619176A (en) Optical information reader
JPS57147148A (en) Information reproducer with magnetooptic system
JPS5753832A (en) Method and device for recording of optical information
JPS5558832A (en) Signal recording and reproducing unit of optical type
JPS5494007A (en) Pickup for disc recorder recorded optically with information
JPS5788540A (en) Method and apparatus for information read-in of optical magnetic recording medium
JPS52109954A (en) Optical signal reader
JPS57169947A (en) Magnetic optical head
JP3162842B2 (en) Optical information reproducing device
JPS57200953A (en) Optical record carrier reader
JPS5558834A (en) Optical readout method
JPS5661046A (en) Optical disc device
JPS5574403A (en) Light position detector
JPS5555445A (en) Optical recording information reproducing device
JPS53107865A (en) Detector of minute undulations
JPS57200961A (en) Reader in optical magnetic disk recording and reproducing system
JPS55140968A (en) Optical information reader
JPS5788535A (en) Pickup device
WO1998037604A3 (en) Optoelectronic device with a semiconductor diode laser amplifier
JPS57169935A (en) Photodetector using semiconductor laser
JPS5637839A (en) Magnetooptical reproducing device
YUJI Optical recording and reproducing device
JPS6095737A (en) Noise eliminating method
JPS54104302A (en) Focus position detecting system