JPS6464141A - Optical information processor - Google Patents
Optical information processorInfo
- 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
Links
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.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62222458A JPS6464141A (en) | 1987-09-04 | 1987-09-04 | Optical information processor |
US07/239,753 US4945525A (en) | 1987-09-04 | 1988-09-02 | Optical information processing apparatus |
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. |
US07/505,026 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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100584703B1 (en) * | 2003-12-26 | 2006-05-30 | 한국전자통신연구원 | Planar Focusing Grating Coupler |
Citations (3)
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 |
-
1987
- 1987-09-04 JP JP62222458A patent/JPS6464141A/en active Pending
Patent Citations (3)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100584703B1 (en) * | 2003-12-26 | 2006-05-30 | 한국전자통신연구원 | Planar Focusing Grating Coupler |
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