JPS5744232A - Optical recorder and reproducer - Google Patents

Optical recorder and reproducer

Info

Publication number
JPS5744232A
JPS5744232A JP11919280A JP11919280A JPS5744232A JP S5744232 A JPS5744232 A JP S5744232A JP 11919280 A JP11919280 A JP 11919280A JP 11919280 A JP11919280 A JP 11919280A JP S5744232 A JPS5744232 A JP S5744232A
Authority
JP
Japan
Prior art keywords
erasing
signal
current
information
recorded
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
JP11919280A
Other languages
Japanese (ja)
Inventor
Shuzo Hitotsumachi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP11919280A priority Critical patent/JPS5744232A/en
Publication of JPS5744232A publication Critical patent/JPS5744232A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
    • G11B7/006—Overwriting

Abstract

PURPOSE:To realize erasing while carrying out reproduction and at the same time to obtain an effect equivalent to the rerecording after erasing, by carrying out the erasing by superposing a DC signal on a record information signal with the intensive light flux during the reproduction time and then reproducing these signals by performing fast forwarding until the information is detected. CONSTITUTION:The current of a power source 2 and modulated by a modulator 1 is applied to a semiconductor laser 3. The beams sent from the laser 3 are focused on a recording surface 6 via a half mirror 4 and a condenser lens 5, and the information is recorded on the surface 6 in the form of a change caused by heat. In the reproduction time, the current of the source 2 is reduced, and the reflected light given from the surface 6 is received at a photodetector 10 to be demodulated by a demodulator 11. For erasion, the current of the source 2 is increased and a DC signal is superposed on a record information signal to be recorded on the surface 6. In the reproduction time, an optical system 8 is quickly forwarded in direction A by a shifter 9 until the information is detected. In such way, erasing is possible while reproducing the part which is once recorded, and at the same time an effect equivalent to rerecording after erasing can be obtained.
JP11919280A 1980-08-28 1980-08-28 Optical recorder and reproducer Pending JPS5744232A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11919280A JPS5744232A (en) 1980-08-28 1980-08-28 Optical recorder and reproducer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11919280A JPS5744232A (en) 1980-08-28 1980-08-28 Optical recorder and reproducer

Publications (1)

Publication Number Publication Date
JPS5744232A true JPS5744232A (en) 1982-03-12

Family

ID=14755189

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11919280A Pending JPS5744232A (en) 1980-08-28 1980-08-28 Optical recorder and reproducer

Country Status (1)

Country Link
JP (1) JPS5744232A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041076U (en) * 1983-08-29 1985-03-23 ニッタン株式会社 information transmission device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6041076U (en) * 1983-08-29 1985-03-23 ニッタン株式会社 information transmission device

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