JPS6449134A - Optical disk recording and reproducing device - Google Patents
Optical disk recording and reproducing deviceInfo
- Publication number
- JPS6449134A JPS6449134A JP62205606A JP20560687A JPS6449134A JP S6449134 A JPS6449134 A JP S6449134A JP 62205606 A JP62205606 A JP 62205606A JP 20560687 A JP20560687 A JP 20560687A JP S6449134 A JPS6449134 A JP S6449134A
- Authority
- JP
- Japan
- Prior art keywords
- beams
- sub
- track
- tracks
- main beam
- 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
Landscapes
- Optical Head (AREA)
Abstract
PURPOSE:To narrow a track pitch and to increase recording density by radiating a main beam and sub-beams to a recording/reproducing track and tracks on both the side of said track and finding out a difference between the reproduced signals of these beams. CONSTITUTION:A main beam 5 is radiated to a track 2 and sub-beams A, B are radiated to tracks 1, 3 in three adjacent tracks 1-3 from a diffraction grating or an array laser having three light emitting parts. At that time, signals on the tracks 1, 3 based upon two sub-beams A, B are reproduced and a difference between the reproduced signals of the sub-beams and that of the main beam 5 is found out. Since the reproducing time of the main beam and the sub-beams is different in accordance with a track speed and a beam position, a difference at the same time is found out by delaying the signals. Thereby, even if the track pitch is narrowed, crosstalk can be removed. Thus, the recording density can be sharply increased.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62205606A JPS6449134A (en) | 1987-08-19 | 1987-08-19 | Optical disk recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62205606A JPS6449134A (en) | 1987-08-19 | 1987-08-19 | Optical disk recording and reproducing device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449134A true JPS6449134A (en) | 1989-02-23 |
Family
ID=16509649
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62205606A Pending JPS6449134A (en) | 1987-08-19 | 1987-08-19 | Optical disk recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449134A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0628953A1 (en) * | 1993-05-18 | 1994-12-14 | Nec Corporation | Cross-talk canceler for optical disk reading mechanism |
EP0986056A2 (en) * | 1998-09-07 | 2000-03-15 | Pioneer Corporation | Optical pickup and information reproducing apparatus |
-
1987
- 1987-08-19 JP JP62205606A patent/JPS6449134A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0628953A1 (en) * | 1993-05-18 | 1994-12-14 | Nec Corporation | Cross-talk canceler for optical disk reading mechanism |
US5544141A (en) * | 1993-05-18 | 1996-08-06 | Nec Corportion | Cross-talk canceler for optical disk reading mechanism |
EP0986056A2 (en) * | 1998-09-07 | 2000-03-15 | Pioneer Corporation | Optical pickup and information reproducing apparatus |
EP0986056A3 (en) * | 1998-09-07 | 2001-01-03 | Pioneer Corporation | Optical pickup and information reproducing apparatus |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5016954A (en) | Optical pickup and hologram therefor | |
US4983017A (en) | Optical head device for reading information stored in a recording medium | |
CA2006141A1 (en) | Optical recording element and optical data retrieval system for use with the same | |
JPS57105828A (en) | Optical disk recording and reproducing system | |
KR950034115A (en) | Optical pickup | |
WO1988001423A3 (en) | Magnetic recording media and servo systems using same | |
EP0423364A4 (en) | Optical recording/reproducing apparatus | |
KR920701952A (en) | Optical recording and / or reproducing apparatus | |
EP0336328A3 (en) | Apparatus for optically recording and reproducing information | |
CA2088188A1 (en) | An optical information recording and reproducing device | |
EP0379285A3 (en) | Tracking control apparatus for a recording/reproducing apparatus on or from an optical disk | |
EP0370655A3 (en) | Optical pick-up devices | |
FR2349910B1 (en) | ||
JPS6449134A (en) | Optical disk recording and reproducing device | |
KR920003271A (en) | Optical Disc Playback Method and Photodetector | |
JPS5534340A (en) | Recording reproducing system by light beam | |
KR960042567A (en) | Tracking method and apparatus for optical record carrier | |
JPS55113139A (en) | Optical information reading pickup unit | |
JPS6479953A (en) | Recording system for guide groove in optical disk | |
KR870011587A (en) | How to Play an Optical Disc | |
KR910020667A (en) | Optical head unit | |
EP0347081A3 (en) | Optical head devices for use in recording and/or reproduction of information | |
JPS57103134A (en) | Optical disk | |
JPS57167153A (en) | Photomagnetic recording medium | |
JPS5764336A (en) | Track signal recording system of optical disk device |