JPH0580055B2 - - Google Patents

Info

Publication number
JPH0580055B2
JPH0580055B2 JP57056581A JP5658182A JPH0580055B2 JP H0580055 B2 JPH0580055 B2 JP H0580055B2 JP 57056581 A JP57056581 A JP 57056581A JP 5658182 A JP5658182 A JP 5658182A JP H0580055 B2 JPH0580055 B2 JP H0580055B2
Authority
JP
Japan
Prior art keywords
light
disk
amount
semiconductor laser
laser
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 - Lifetime
Application number
JP57056581A
Other languages
English (en)
Japanese (ja)
Other versions
JPS58175149A (ja
Inventor
Toshio Sugyama
Hideo Suenaga
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 JP57056581A priority Critical patent/JPS58175149A/ja
Priority to DE8383100531T priority patent/DE3376172D1/de
Priority to US06/460,015 priority patent/US4532619A/en
Priority to EP83100531A priority patent/EP0084871B1/de
Publication of JPS58175149A publication Critical patent/JPS58175149A/ja
Publication of JPH0580055B2 publication Critical patent/JPH0580055B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/005—Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Head (AREA)
  • Semiconductor Lasers (AREA)
JP57056581A 1982-01-22 1982-04-07 光ピツクアツプ装置 Granted JPS58175149A (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP57056581A JPS58175149A (ja) 1982-04-07 1982-04-07 光ピツクアツプ装置
DE8383100531T DE3376172D1 (en) 1982-01-22 1983-01-21 Method and apparatus for reducing semiconductor laser optical noise
US06/460,015 US4532619A (en) 1982-01-22 1983-01-21 Method and apparatus for reducing semiconductor laser optical noise
EP83100531A EP0084871B1 (de) 1982-01-22 1983-01-21 Verfahren und Vorrichtung zur Reduzierung von optischen Rauschen in Halbleiterlasern

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP57056581A JPS58175149A (ja) 1982-04-07 1982-04-07 光ピツクアツプ装置

Publications (2)

Publication Number Publication Date
JPS58175149A JPS58175149A (ja) 1983-10-14
JPH0580055B2 true JPH0580055B2 (de) 1993-11-05

Family

ID=13031127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP57056581A Granted JPS58175149A (ja) 1982-01-22 1982-04-07 光ピツクアツプ装置

Country Status (1)

Country Link
JP (1) JPS58175149A (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60169601U (ja) * 1984-04-18 1985-11-11 フオスタ−電機株式会社 ハ−フプリズム
JPS619845A (ja) * 1984-06-22 1986-01-17 Sanyo Electric Co Ltd 光学式ピツクアツプ装置
JPS61292231A (ja) * 1985-06-19 1986-12-23 Akai Electric Co Ltd 光ピツクアツプ装置
JPS62137734A (ja) * 1985-11-20 1987-06-20 Mitsubishi Electric Corp 光学ヘツド装置
JP2575133B2 (ja) * 1987-04-07 1997-01-22 キヤノン株式会社 光カ−ド記録及び／又は再生装置用光学ピツクアツプ

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5310407A (en) * 1976-07-16 1978-01-30 Mansei Kogyo Kk Optical information reader
JPS5637834A (en) * 1980-08-20 1981-04-11 Hitachi Ltd Optical pickup
JPS5680193A (en) * 1979-12-06 1981-07-01 Nippon Telegr & Teleph Corp <Ntt> Semiconductor laser device
JPS56145534A (en) * 1980-04-11 1981-11-12 Mitsubishi Electric Corp Semiconductor laser
JPS5744241A (en) * 1980-08-27 1982-03-12 Matsushita Electric Ind Co Ltd Magnetooptic reproducer

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5310407A (en) * 1976-07-16 1978-01-30 Mansei Kogyo Kk Optical information reader
JPS5680193A (en) * 1979-12-06 1981-07-01 Nippon Telegr & Teleph Corp <Ntt> Semiconductor laser device
JPS56145534A (en) * 1980-04-11 1981-11-12 Mitsubishi Electric Corp Semiconductor laser
JPS5637834A (en) * 1980-08-20 1981-04-11 Hitachi Ltd Optical pickup
JPS5744241A (en) * 1980-08-27 1982-03-12 Matsushita Electric Ind Co Ltd Magnetooptic reproducer

Also Published As

Publication number Publication date
JPS58175149A (ja) 1983-10-14

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