JPS6413242A - Semiconductor laser output controlling method for multi-beam magneto-optical pickup - Google Patents
Semiconductor laser output controlling method for multi-beam magneto-optical pickupInfo
- Publication number
- JPS6413242A JPS6413242A JP62168092A JP16809287A JPS6413242A JP S6413242 A JPS6413242 A JP S6413242A JP 62168092 A JP62168092 A JP 62168092A JP 16809287 A JP16809287 A JP 16809287A JP S6413242 A JPS6413242 A JP S6413242A
- Authority
- JP
- Japan
- Prior art keywords
- reproducing
- recording
- output
- laser
- erasing
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
Abstract
PURPOSE:To speed up erasing, recording and reproducing by making a device into such constitution that respective semiconductor lasers for the erasing and the recording, and for the reproducing are arranged, and control is executed through a sampling circuit and a comparator at the time of the erasing, the recording and the reproducing. CONSTITUTION:In an erase mode, a timing signal T2 comes to a high level at the time of address read, and a sampling hold circuit 26 samples the output of a low pass filter 24, and the output of the reproducing semiconductor laser 13, always in ON state, is controlled at a reference voltage Vref2, and in an erase area, the erasing recording laser 12 is lit together with the laser 13, and its output is controlled at the reference voltage, and the signals of the two lasers are inputted to the comparators 21, 22, and are compared with a reference value. At the time of the recording, the signal T1 comes to the high level, and the laser 12 is lit as well, and the output is controlled by the sampling hold circuit 25, and information is recorded by the ON/OFF of it. At the time of the reproducing, the laser 12 is turned off, and the output of the laser 13 is controlled. Accordingly, the output of the lasers 12, 13 are controlled, and the erasing, the recording and the reproducing can be executed at high speed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62168092A JPS6413242A (en) | 1987-07-06 | 1987-07-06 | Semiconductor laser output controlling method for multi-beam magneto-optical pickup |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62168092A JPS6413242A (en) | 1987-07-06 | 1987-07-06 | Semiconductor laser output controlling method for multi-beam magneto-optical pickup |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6413242A true JPS6413242A (en) | 1989-01-18 |
Family
ID=15861696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62168092A Pending JPS6413242A (en) | 1987-07-06 | 1987-07-06 | Semiconductor laser output controlling method for multi-beam magneto-optical pickup |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6413242A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0713215A2 (en) * | 1994-11-16 | 1996-05-22 | Canon Kabushiki Kaisha | Optical information recording and/or reproducing apparatus and method with auto power control function for two light sources |
| US8962790B2 (en) | 2001-02-27 | 2015-02-24 | Kaneka Corporation | Polyimide film and process for producing the same |
-
1987
- 1987-07-06 JP JP62168092A patent/JPS6413242A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0713215A2 (en) * | 1994-11-16 | 1996-05-22 | Canon Kabushiki Kaisha | Optical information recording and/or reproducing apparatus and method with auto power control function for two light sources |
| EP0713215A3 (en) * | 1994-11-16 | 1996-10-09 | Canon Kk | Optical information recording and/or reproducing apparatus and method with auto power control function for two light sources |
| US8962790B2 (en) | 2001-02-27 | 2015-02-24 | Kaneka Corporation | Polyimide film and process for producing the same |
| US9441082B2 (en) | 2001-02-27 | 2016-09-13 | Kaneka Corporation | Polyimide film and process for producing the same |
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