JPS563439A - Optical disk - Google Patents

Optical disk

Info

Publication number
JPS563439A
JPS563439A JP7921079A JP7921079A JPS563439A JP S563439 A JPS563439 A JP S563439A JP 7921079 A JP7921079 A JP 7921079A JP 7921079 A JP7921079 A JP 7921079A JP S563439 A JPS563439 A JP S563439A
Authority
JP
Japan
Prior art keywords
cycle
pit
oscillator
pits
meandering
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
Application number
JP7921079A
Other languages
Japanese (ja)
Other versions
JPS5821336B2 (en
Inventor
Takeshi Maeda
Kazuo Shigematsu
Seiji Yonezawa
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP54079210A priority Critical patent/JPS5821336B2/en
Priority to US06/160,199 priority patent/US4364118A/en
Priority to EP80103574A priority patent/EP0021411B1/en
Priority to DE8080103574T priority patent/DE3072052D1/en
Priority to CA000354741A priority patent/CA1138106A/en
Publication of JPS563439A publication Critical patent/JPS563439A/en
Publication of JPS5821336B2 publication Critical patent/JPS5821336B2/en
Expired legal-status Critical Current

Links

Abstract

PURPOSE: To realize the easy and accurate additional recording of the information, by arranging the pit trains on the optical disk with a fixed space secured and at the same time forming the guide groove so that the pit train may have the meandering in the rotational direction of the optical disk and in a fixed cycle.
CONSTITUTION: In the figure the solid lines and dotted lines indicate the guide groove pits and the pits to be recorded in addition respectively. The pits of the guide groove are recorded so as to secure the meandering with cycle T and by minute amplitude δ. And the pit space is formed to secure cycle (t). Both the output supplied from oscillator 76 having repetitive frequency f0 of cycle (t) and the output of oscillator 77 having frequency f1 of cycle (t) are applied and then modulated through optical modulator 62 to form the guide pit of cycle (t). On the other hand, the output of oscillator 78 having cycle T and frequency f2 is supplied to synchronous circuit 74 and then to light deflector 64. As a result, the light beams have the minute vibrations on the disk, thus securing the meandering recording for the pit train of cycle T.
COPYRIGHT: (C)1981,JPO&Japio
JP54079210A 1979-06-25 1979-06-25 Optical discs and information recording devices Expired JPS5821336B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP54079210A JPS5821336B2 (en) 1979-06-25 1979-06-25 Optical discs and information recording devices
US06/160,199 US4364118A (en) 1979-06-25 1980-06-17 Optical disk and optical information processor
EP80103574A EP0021411B1 (en) 1979-06-25 1980-06-24 Optical disk and optical information processor
DE8080103574T DE3072052D1 (en) 1979-06-25 1980-06-24 Optical disk and optical information processor
CA000354741A CA1138106A (en) 1979-06-25 1980-06-25 Optical disk and optical information processor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP54079210A JPS5821336B2 (en) 1979-06-25 1979-06-25 Optical discs and information recording devices

Publications (2)

Publication Number Publication Date
JPS563439A true JPS563439A (en) 1981-01-14
JPS5821336B2 JPS5821336B2 (en) 1983-04-28

Family

ID=13683569

Family Applications (1)

Application Number Title Priority Date Filing Date
JP54079210A Expired JPS5821336B2 (en) 1979-06-25 1979-06-25 Optical discs and information recording devices

Country Status (1)

Country Link
JP (1) JPS5821336B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57111835A (en) * 1980-12-29 1982-07-12 Fujitsu Ltd Optical information recording system
JPS57208647A (en) * 1981-06-18 1982-12-21 Toshiba Corp Optical disk for recording of information
JPS58165742U (en) * 1982-04-27 1983-11-04 株式会社東芝 optical information storage medium
WO1984003988A1 (en) * 1983-03-28 1984-10-11 Matsushita Electric Ind Co Ltd Disc-shaped recording medium
JPS61108589A (en) * 1984-11-02 1986-05-27 Ricoh Co Ltd Optical information recording medium
JPH01162282A (en) * 1987-12-18 1989-06-26 Hitachi Ltd Tracking system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57111835A (en) * 1980-12-29 1982-07-12 Fujitsu Ltd Optical information recording system
JPS57208647A (en) * 1981-06-18 1982-12-21 Toshiba Corp Optical disk for recording of information
JPH0252328B2 (en) * 1981-06-18 1990-11-13 Tokyo Shibaura Electric Co
JPS58165742U (en) * 1982-04-27 1983-11-04 株式会社東芝 optical information storage medium
WO1984003988A1 (en) * 1983-03-28 1984-10-11 Matsushita Electric Ind Co Ltd Disc-shaped recording medium
JPS61108589A (en) * 1984-11-02 1986-05-27 Ricoh Co Ltd Optical information recording medium
JPH01162282A (en) * 1987-12-18 1989-06-26 Hitachi Ltd Tracking system

Also Published As

Publication number Publication date
JPS5821336B2 (en) 1983-04-28

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