JPS54143107A - Optical information device - Google Patents

Optical information device

Info

Publication number
JPS54143107A
JPS54143107A JP4983078A JP4983078A JPS54143107A JP S54143107 A JPS54143107 A JP S54143107A JP 4983078 A JP4983078 A JP 4983078A JP 4983078 A JP4983078 A JP 4983078A JP S54143107 A JPS54143107 A JP S54143107A
Authority
JP
Japan
Prior art keywords
information
laser
high band
recorded
elongated
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
JP4983078A
Other languages
Japanese (ja)
Other versions
JPS6412011B2 (en
Inventor
Yoshito Tsunoda
Koji Suga
Seiji Yonezawa
Kazuo Shigematsu
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 JP4983078A priority Critical patent/JPS54143107A/en
Publication of JPS54143107A publication Critical patent/JPS54143107A/en
Publication of JPS6412011B2 publication Critical patent/JPS6412011B2/ja
Granted legal-status Critical Current

Links

Abstract

PURPOSE: To record and reproduce high band signals easily with the use of a semiconductor laser by partly elongating recording information and controlling the rotating speed of a recording medium.
CONSTITUTION: High band information having being subjected to D/A conversion is recorded in a frame memory 19. If this record is read out in a low frequency, the information is elongated and fed to a semiconductor laser 1 through a C/A converter 22, an FM modulator 23, a laser drive circuit 18 and a switch 13. Thus, the elongated high band information is recorded without any use of a large size gas laser and an optical modulator in a disk 6 which is turned at a low speed together with such a motor 14 as is driven through the switch 13 by a low speed power source 15 by the modulated laser light generated in accordance with the elongated information by the laser 1. When the switch 13 is changed over, a DC power source 17 continuously drives the laser 1, and the power source of the motor 14 is changed to a high speed power source 16 so that the elongated information recorded in the disc 6 is compressed to reproduce the high band information. As a result, the high band information is recorded and reproduced simply with the use of the semiconductor of low power.
COPYRIGHT: (C)1979,JPO&Japio
JP4983078A 1978-04-28 1978-04-28 Optical information device Granted JPS54143107A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4983078A JPS54143107A (en) 1978-04-28 1978-04-28 Optical information device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4983078A JPS54143107A (en) 1978-04-28 1978-04-28 Optical information device

Publications (2)

Publication Number Publication Date
JPS54143107A true JPS54143107A (en) 1979-11-08
JPS6412011B2 JPS6412011B2 (en) 1989-02-28

Family

ID=12841992

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4983078A Granted JPS54143107A (en) 1978-04-28 1978-04-28 Optical information device

Country Status (1)

Country Link
JP (1) JPS54143107A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5687239A (en) * 1979-12-18 1981-07-15 Matsushita Electric Ind Co Ltd Optical recording and reproducing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS451316Y1 (en) * 1969-06-13 1970-01-21

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS451316Y1 (en) * 1969-06-13 1970-01-21

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5687239A (en) * 1979-12-18 1981-07-15 Matsushita Electric Ind Co Ltd Optical recording and reproducing device
JPS6363974B2 (en) * 1979-12-18 1988-12-09

Also Published As

Publication number Publication date
JPS6412011B2 (en) 1989-02-28

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