JPS5619528A - Optical recording and reproducing unit - Google Patents

Optical recording and reproducing unit

Info

Publication number
JPS5619528A
JPS5619528A JP9521079A JP9521079A JPS5619528A JP S5619528 A JPS5619528 A JP S5619528A JP 9521079 A JP9521079 A JP 9521079A JP 9521079 A JP9521079 A JP 9521079A JP S5619528 A JPS5619528 A JP S5619528A
Authority
JP
Japan
Prior art keywords
signal
recording
disc
light
reproduced
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
JP9521079A
Other languages
Japanese (ja)
Other versions
JPS6136293B2 (en
Inventor
Tomio Yoshida
Michiyoshi Nagashima
Shunji Harikae
Shiro Tsuji
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 JP9521079A priority Critical patent/JPS5619528A/en
Publication of JPS5619528A publication Critical patent/JPS5619528A/en
Publication of JPS6136293B2 publication Critical patent/JPS6136293B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE: To prevent the track formed newly on the disc from being crossed or laminated on the track formed with recording in advance, by automatical control the recording light source and the driving unit for the light source according to the signal reproduced from the disc.
CONSTITUTION: The light L from the semiconductor laser 101 of the recording and reproduction optical unit 10 is focussed into a fine diameter, radiated on the optical recording disc 11, recorded and reproduced, and the light power of the light source is set for the power at signal reproduction and signal recording, the power at reproduction is irradiated in advance to the signal recording section of the disc 11, the reflection light of disc is detected at the photodetector 105 to detect the presence of the envelope of the reproducing signal, and if the reproduced light is in crossing with the track pre recorded or is abnormally close to it, the envelope signal is output according to the part, and control is made at the semiconductor laser driving circuit 20 based on the envelope signal.
COPYRIGHT: (C)1981,JPO&Japio
JP9521079A 1979-07-25 1979-07-25 Optical recording and reproducing unit Granted JPS5619528A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9521079A JPS5619528A (en) 1979-07-25 1979-07-25 Optical recording and reproducing unit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9521079A JPS5619528A (en) 1979-07-25 1979-07-25 Optical recording and reproducing unit

Publications (2)

Publication Number Publication Date
JPS5619528A true JPS5619528A (en) 1981-02-24
JPS6136293B2 JPS6136293B2 (en) 1986-08-18

Family

ID=14131379

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9521079A Granted JPS5619528A (en) 1979-07-25 1979-07-25 Optical recording and reproducing unit

Country Status (1)

Country Link
JP (1) JPS5619528A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0457033U (en) * 1990-09-18 1992-05-15

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0457033U (en) * 1990-09-18 1992-05-15

Also Published As

Publication number Publication date
JPS6136293B2 (en) 1986-08-18

Similar Documents

Publication Publication Date Title
DE3364892D1 (en) Optical information processor
JPS54143109A (en) Optical information device
AU4554489A (en) Method and apparatus for controlling and detecting recording laser beam
EP0411120A4 (en) Laser reproduction apparatus.
MY130581A (en) Write once optical disc recording apparatus
JPS6430025A (en) Recording and reproducing device
EP0422227A4 (en) Optical disc recording/reproducing apparatus
JPS647327A (en) Method and apparatus for optical information recording
SG164894G (en) Data protection device
JPS5619528A (en) Optical recording and reproducing unit
JPS57167142A (en) Optical recording and reproducing device
JPS6410431A (en) Protection device in optical recording and reproducing device
JPS55125542A (en) Optical reproduction unit
JPS57150147A (en) Optical type recorder and reproducer
JPS5538663A (en) Detector for recording medium of optical information reader
JPS643818A (en) Optical recording and reproducing device
JPS60243832A (en) Optical information detecting device
JPS5755568A (en) Recording and reproducing device
JPS53100203A (en) Optical reproducer
JPS56148745A (en) Optical recorder and reproducer
JPS5718031A (en) Optical information recording and reproducing method
JPS5348504A (en) Optical recorder/reproducer
JPS5315105A (en) Spacing detector of optical recorder/reproducer
JPS55108937A (en) Optical recording and reproducing device
JPS5644129A (en) Optical recording and reproducing device