JPS6464141A - Optical information processor - Google Patents

Optical information processor

Info

Publication number
JPS6464141A
JPS6464141A JP62222458A JP22245887A JPS6464141A JP S6464141 A JPS6464141 A JP S6464141A JP 62222458 A JP62222458 A JP 62222458A JP 22245887 A JP22245887 A JP 22245887A JP S6464141 A JPS6464141 A JP S6464141A
Authority
JP
Japan
Prior art keywords
coupler
light
spot
reflected light
waveguide
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.)
Pending
Application number
JP62222458A
Other languages
Japanese (ja)
Inventor
Osamu Yamamoto
Tomohiko Yoshida
Saburo Yamamoto
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.)
Sharp Corp
Original Assignee
Sharp 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 Sharp Corp filed Critical Sharp Corp
Priority to JP62222458A priority Critical patent/JPS6464141A/en
Priority to EP88308177A priority patent/EP0306342B1/en
Priority to DE3887602T priority patent/DE3887602T2/en
Priority to US07/239,753 priority patent/US4945525A/en
Publication of JPS6464141A publication Critical patent/JPS6464141A/en
Priority to US07/505,026 priority patent/US5119355A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Head (AREA)
  • Optical Integrated Circuits (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To execute a stable tracking operation without generating an offset, by radiating plural laser beam spots to a recording medium, leading its reflected light into a waveguide formed on a substrate, detecting the light intensity at every reflected light corresponding to each spot and bringing it to photoelectric conversion, comparing its light receiving outputs and detecting a tracking error signal. CONSTITUTION:On a glass substrate 1 of an optical information processor, an optical waveguide layer 2 is formed, and a converging grating coupler 3 and a grating beam splitter 5 are formed through a clad layer. Also, on the substrate 1, tri-sected photodetectors 6, 7 and photodetectors 8, 9 are formed. In this state, three emitted light beams from a semiconductor laser 11 are made incident on the coupler 3 in parallel, and by a zero-order diffracted light passing through the coupler 3, a spot is formed on an optical disk 14. A reflected light from its spot becomes a waveguide light to the layer 2 by the coupler 3, differentials of the center part and both end parts are detected by the detectors 6, 7, and by comparing its differentials, a focus error signal is detected.
JP62222458A 1987-09-04 1987-09-04 Optical information processor Pending JPS6464141A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP62222458A JPS6464141A (en) 1987-09-04 1987-09-04 Optical information processor
EP88308177A EP0306342B1 (en) 1987-09-04 1988-09-02 Optical information processing apparatus
DE3887602T DE3887602T2 (en) 1987-09-04 1988-09-02 Device for processing optical information.
US07/239,753 US4945525A (en) 1987-09-04 1988-09-02 Optical information processing apparatus
US07/505,026 US5119355A (en) 1987-09-04 1990-04-05 Optical information processing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62222458A JPS6464141A (en) 1987-09-04 1987-09-04 Optical information processor

Publications (1)

Publication Number Publication Date
JPS6464141A true JPS6464141A (en) 1989-03-10

Family

ID=16782730

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62222458A Pending JPS6464141A (en) 1987-09-04 1987-09-04 Optical information processor

Country Status (1)

Country Link
JP (1) JPS6464141A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100584703B1 (en) * 2003-12-26 2006-05-30 한국전자통신연구원 Flat grating

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60212835A (en) * 1984-04-09 1985-10-25 Mitsubishi Electric Corp Optical information recording and reproducing device
JPS6111947A (en) * 1984-06-27 1986-01-20 Canon Inc optical head device
JPS61190723A (en) * 1985-02-19 1986-08-25 Mitsubishi Electric Corp Optical head device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60212835A (en) * 1984-04-09 1985-10-25 Mitsubishi Electric Corp Optical information recording and reproducing device
JPS6111947A (en) * 1984-06-27 1986-01-20 Canon Inc optical head device
JPS61190723A (en) * 1985-02-19 1986-08-25 Mitsubishi Electric Corp Optical head device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100584703B1 (en) * 2003-12-26 2006-05-30 한국전자통신연구원 Flat grating

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