JPS5589920A - Duplicated recording prevention unit in optical recording and reproducing unit - Google Patents

Duplicated recording prevention unit in optical recording and reproducing unit

Info

Publication number
JPS5589920A
JPS5589920A JP16348778A JP16348778A JPS5589920A JP S5589920 A JPS5589920 A JP S5589920A JP 16348778 A JP16348778 A JP 16348778A JP 16348778 A JP16348778 A JP 16348778A JP S5589920 A JPS5589920 A JP S5589920A
Authority
JP
Japan
Prior art keywords
recording
signal
recorded
duplicated
bits
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
JP16348778A
Other languages
Japanese (ja)
Inventor
Tomio Yoshida
Shiro Tsuji
Michiyoshi Nagashima
Shunji Harikae
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 JP16348778A priority Critical patent/JPS5589920A/en
Publication of JPS5589920A publication Critical patent/JPS5589920A/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
    • 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
    • G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
    • 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
    • G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track

Abstract

PURPOSE:To prevent the duplicated recording of signal, by stopping the supply of recording signal through the detection of the effect due to interference between the recording and recorded signals, when recording is started from non-recording part and the recorded light touches the recorded part. CONSTITUTION:The bits at the recorded part shown in b reduce the light transmission and the repetitive frequency does not have the correlativity with the recording signal shown in a. When the recording light modulated for the intensity with the recording signal is emitted on the bits, the light signal detected at the PIN diode 9 is modulated with the bits as shown in c. Accordingly, the rectangular waves shown in d and shaped with the limiter for the waveform and the recording signal inputted from the terminal I are inputted to the phase comparison unit 103. The output of the phase comparator 103 is detected with the level detector 105 through the integrator 104 and shaped, pulses are developed when the phase variation is taken place, REC FF101 is reset and the recording mode is cancelled to avoid duplicated recording.
JP16348778A 1978-12-28 1978-12-28 Duplicated recording prevention unit in optical recording and reproducing unit Pending JPS5589920A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16348778A JPS5589920A (en) 1978-12-28 1978-12-28 Duplicated recording prevention unit in optical recording and reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16348778A JPS5589920A (en) 1978-12-28 1978-12-28 Duplicated recording prevention unit in optical recording and reproducing unit

Publications (1)

Publication Number Publication Date
JPS5589920A true JPS5589920A (en) 1980-07-08

Family

ID=15774791

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16348778A Pending JPS5589920A (en) 1978-12-28 1978-12-28 Duplicated recording prevention unit in optical recording and reproducing unit

Country Status (1)

Country Link
JP (1) JPS5589920A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089021A2 (en) * 1982-03-15 1983-09-21 Kabushiki Kaisha Toshiba Overlay recording prevention device for optical disc apparatus
JPS63167427A (en) * 1986-12-29 1988-07-11 Nippon Columbia Co Ltd Optical disk device
KR100512579B1 (en) * 1996-10-22 2005-12-30 소니 가부시끼 가이샤 Image replication control system, image playback device, image recording device, information overlapping and extraction device and image recording medium

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0089021A2 (en) * 1982-03-15 1983-09-21 Kabushiki Kaisha Toshiba Overlay recording prevention device for optical disc apparatus
JPS63167427A (en) * 1986-12-29 1988-07-11 Nippon Columbia Co Ltd Optical disk device
KR100512579B1 (en) * 1996-10-22 2005-12-30 소니 가부시끼 가이샤 Image replication control system, image playback device, image recording device, information overlapping and extraction device and image recording medium

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