JPS55122240A - Optical recording and reproducing device - Google Patents
Optical recording and reproducing deviceInfo
- Publication number
- JPS55122240A JPS55122240A JP2718179A JP2718179A JPS55122240A JP S55122240 A JPS55122240 A JP S55122240A JP 2718179 A JP2718179 A JP 2718179A JP 2718179 A JP2718179 A JP 2718179A JP S55122240 A JPS55122240 A JP S55122240A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- reproducing
- recording
- conductive
- switch
- 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.)
- Granted
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE: To enhance response of irradiation power by reducing the transient response delay of transmission light power from reproducing to recording and from recording to reproducing to perform stable and uniform coaxial recording and by controlling power of the reproducing light at a reproducing time.
CONSTITUTION: Laser light source 1, EO modulator 2, intermediate lens 3, tracking mirror 4, object lens 5, disc-shaped recording medium 6, disc motor 7, picture signal generator 16, FM modulator 17, high-speed switch 18, and amplifier 19 are provided. An optical power servo loop is formed by beam splitter 8, photo detector 9, pre-amplifier 10, differential amplifier 11, amplifiers 13 and 15, high-speed switch 20, capacitor 21, and voltage follower 22. Voltage follower 22 is an amplifier of gain 1, and capacitor 21 and voltage follower 22 send the output of amplifier 13 to amplifier 15 as it is when switch 20 is conductive, and they held the just preceding output of amplifier 13 when switch 20 becomes non-conductive. In switch 20, Q and R are conductive at a reproducing time, and Q and R are conductive at a recording time.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2718179A JPS55122240A (en) | 1979-03-07 | 1979-03-07 | Optical recording and reproducing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2718179A JPS55122240A (en) | 1979-03-07 | 1979-03-07 | Optical recording and reproducing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55122240A true JPS55122240A (en) | 1980-09-19 |
JPS6136292B2 JPS6136292B2 (en) | 1986-08-18 |
Family
ID=12213899
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2718179A Granted JPS55122240A (en) | 1979-03-07 | 1979-03-07 | Optical recording and reproducing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55122240A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5840878A (en) * | 1981-09-04 | 1983-03-09 | Hitachi Ltd | Driving method for semiconductor laser |
FR2514540A1 (en) * | 1981-10-08 | 1983-04-15 | Sony Corp | OPTICAL RECORDING APPARATUS |
JPS58158051A (en) * | 1982-03-15 | 1983-09-20 | Toshiba Corp | Controller for stabilizing output of semiconductor laser oscillator |
JPS61248243A (en) * | 1985-04-25 | 1986-11-05 | Sony Corp | Optical recording and reproducing device |
US4742505A (en) * | 1984-11-21 | 1988-05-03 | Olympus Optical Company Limited | Optical information recording and reproducing memory system |
US4858219A (en) * | 1984-11-20 | 1989-08-15 | Olympus Optical Company Limited | Optical information recording reproducing memory system with both power control and optical irradiation inhibiting circuit |
US5699343A (en) * | 1995-03-30 | 1997-12-16 | Fujitsu Limited | Disk apparatus |
JPH1069664A (en) * | 1997-08-01 | 1998-03-10 | Sony Corp | Laser power regulating device |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4126889A1 (en) | 2020-04-01 | 2023-02-08 | Umicore AG & Co. KG | Metal organic compounds |
-
1979
- 1979-03-07 JP JP2718179A patent/JPS55122240A/en active Granted
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5840878A (en) * | 1981-09-04 | 1983-03-09 | Hitachi Ltd | Driving method for semiconductor laser |
JPH0451893B2 (en) * | 1981-09-04 | 1992-08-20 | Hitachi Ltd | |
FR2514540A1 (en) * | 1981-10-08 | 1983-04-15 | Sony Corp | OPTICAL RECORDING APPARATUS |
JPS58158051A (en) * | 1982-03-15 | 1983-09-20 | Toshiba Corp | Controller for stabilizing output of semiconductor laser oscillator |
JPS6343819B2 (en) * | 1982-03-15 | 1988-09-01 | Tokyo Shibaura Electric Co | |
US4858219A (en) * | 1984-11-20 | 1989-08-15 | Olympus Optical Company Limited | Optical information recording reproducing memory system with both power control and optical irradiation inhibiting circuit |
US4742505A (en) * | 1984-11-21 | 1988-05-03 | Olympus Optical Company Limited | Optical information recording and reproducing memory system |
JPS61248243A (en) * | 1985-04-25 | 1986-11-05 | Sony Corp | Optical recording and reproducing device |
US5699343A (en) * | 1995-03-30 | 1997-12-16 | Fujitsu Limited | Disk apparatus |
JPH1069664A (en) * | 1997-08-01 | 1998-03-10 | Sony Corp | Laser power regulating device |
Also Published As
Publication number | Publication date |
---|---|
JPS6136292B2 (en) | 1986-08-18 |
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