JPS6247834A - Information recording and reproducing device - Google Patents

Information recording and reproducing device

Info

Publication number
JPS6247834A
JPS6247834A JP60186927A JP18692785A JPS6247834A JP S6247834 A JPS6247834 A JP S6247834A JP 60186927 A JP60186927 A JP 60186927A JP 18692785 A JP18692785 A JP 18692785A JP S6247834 A JPS6247834 A JP S6247834A
Authority
JP
Japan
Prior art keywords
circuit
recording power
recording
level
light intensity
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
JP60186927A
Other languages
Japanese (ja)
Inventor
Masayuki Shibano
Shinichi Yamada
Original Assignee
Matsushita Electric Ind Co Ltd
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 Matsushita Electric Ind Co Ltd filed Critical Matsushita Electric Ind Co Ltd
Priority to JP60186927A priority Critical patent/JPS6247834A/en
Publication of JPS6247834A publication Critical patent/JPS6247834A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To obtain the optical information faithful to the recording signal by providing a recording power control circuit to keep the recording power approximately at a fixed level to record the information '1' and controlling the semiconductor laser so that the recording power functioning to record the information '0' is increased gradually up to a fixed level of light intensity.
CONSTITUTION: The intensity of a semiconductor laser 1 is controlled by the 1st or 2nd recording power setting circuit 4 or 5. Then the 1st or 2nd recording power is controlled by the 1st or 2nd switch circuit 2 or 3. Then, the circuit 2 or 3 conducts by an inverting circuit 7. Here, the recording power is set approximately at affixed level by the circuit 4 when the recording is executed. While the recording power set by the circuit 5 is increased gradually by a recording power control circuit 8. Thus, the low level side of the light intensity of the laser 1 is gradually increased and this light intensity is set at a high level when the rectangular wave signal is delivered under the control of a recording control circuit 6. Thus, it is possible to obtain an output waveform faithful to the recording signal.
COPYRIGHT: (C)1987,JPO&Japio
JP60186927A 1985-08-26 1985-08-26 Information recording and reproducing device Pending JPS6247834A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP60186927A JPS6247834A (en) 1985-08-26 1985-08-26 Information recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP60186927A JPS6247834A (en) 1985-08-26 1985-08-26 Information recording and reproducing device

Publications (1)

Publication Number Publication Date
JPS6247834A true JPS6247834A (en) 1987-03-02

Family

ID=16197145

Family Applications (1)

Application Number Title Priority Date Filing Date
JP60186927A Pending JPS6247834A (en) 1985-08-26 1985-08-26 Information recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS6247834A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0546989A (en) * 1991-08-12 1993-02-26 Sharp Corp Optical information reproducing device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0546989A (en) * 1991-08-12 1993-02-26 Sharp Corp Optical information reproducing device

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