JPS5443756A - Optically recording and reproducing apparatus - Google Patents

Optically recording and reproducing apparatus

Info

Publication number
JPS5443756A
JPS5443756A JP11073577A JP11073577A JPS5443756A JP S5443756 A JPS5443756 A JP S5443756A JP 11073577 A JP11073577 A JP 11073577A JP 11073577 A JP11073577 A JP 11073577A JP S5443756 A JPS5443756 A JP S5443756A
Authority
JP
Japan
Prior art keywords
lens
disc
light beam
irradiated
irradiate
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
JP11073577A
Other languages
Japanese (ja)
Other versions
JPS5942376B2 (en
Inventor
Shunji Harikae
Tomio Yoshida
Akifumi Nakada
Toshio Sato
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 JP52110735A priority Critical patent/JPS5942376B2/en
Publication of JPS5443756A publication Critical patent/JPS5443756A/en
Publication of JPS5942376B2 publication Critical patent/JPS5942376B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Optical Head (AREA)
  • Automatic Focus Adjustment (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE: To simplify the optical conditions, to reduce the size of the apparatus and to generate stable reproduction signals having a high S/N ratio by using two light sources, which are suitable for recording and reproducing purposes, respectively, so that the iris positions of the respective beams may be adjusted by a focus controlling detector.
CONSTITUTION: A light beam a, which is produced by modulating the recording signals from a terminal A by a drive circuit 1, is generated from a semiconductor laser 2 so that it may be introduced through a condensing lens 3 and a tracking mirror 4 into the center of an iris lens 5. The light beam thus introduced is irised out the most at a point P into a fine spot, which is irradiated upon a disc 6 to record the information. The light beam 6 from a He-Ne laser 10 is enlarged by a projecting lens 11 so that it may be irradiated upon the disc 6 from the position out of the center of the lens 5. The splitter 12 changes the optical path of the reflected light c from the disc 6 to irradiate optical detectors 14 and 15. The output difference between the detectors 14 and 15 is fed to a lens drive device 13 so that the lens 5 may be moved up and down, even if the disc is vibrated by the rotations, so as to irradiate the fine spot P upon the disc.
COPYRIGHT: (C)1979,JPO&Japio
JP52110735A 1977-09-13 1977-09-13 optical recording and reproducing device Expired JPS5942376B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP52110735A JPS5942376B2 (en) 1977-09-13 1977-09-13 optical recording and reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP52110735A JPS5942376B2 (en) 1977-09-13 1977-09-13 optical recording and reproducing device

Publications (2)

Publication Number Publication Date
JPS5443756A true JPS5443756A (en) 1979-04-06
JPS5942376B2 JPS5942376B2 (en) 1984-10-15

Family

ID=14543180

Family Applications (1)

Application Number Title Priority Date Filing Date
JP52110735A Expired JPS5942376B2 (en) 1977-09-13 1977-09-13 optical recording and reproducing device

Country Status (1)

Country Link
JP (1) JPS5942376B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6433736A (en) * 1988-07-15 1989-02-03 Sony Corp Device for reproducing optical record

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6433736A (en) * 1988-07-15 1989-02-03 Sony Corp Device for reproducing optical record

Also Published As

Publication number Publication date
JPS5942376B2 (en) 1984-10-15

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