JPS54143606A - Optical recorder-reproducer - Google Patents

Optical recorder-reproducer

Info

Publication number
JPS54143606A
JPS54143606A JP5180778A JP5180778A JPS54143606A JP S54143606 A JPS54143606 A JP S54143606A JP 5180778 A JP5180778 A JP 5180778A JP 5180778 A JP5180778 A JP 5180778A JP S54143606 A JPS54143606 A JP S54143606A
Authority
JP
Japan
Prior art keywords
tracks
width
reproducer
plane
rectangular
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
JP5180778A
Other languages
Japanese (ja)
Inventor
Tomio Yoshida
Akifumi Nakada
Shunji Harikae
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 JP5180778A priority Critical patent/JPS54143606A/en
Priority to US06/033,005 priority patent/US4272651A/en
Publication of JPS54143606A publication Critical patent/JPS54143606A/en
Pending legal-status Critical Current

Links

Landscapes

  • Automatic Focus Adjustment (AREA)
  • Optical Head (AREA)

Abstract

PURPOSE: To obtain stable recording-reproducing operations by so arranging the diameter of the width direction of the information track of the spot at the reproducing as to become larger than the diameter of the spot at the recording.
CONSTITUTION: A cylindrical lens 20 is so inserted as to have a curvature at the plane rectangular to tracks and have no curvature at the plane in the track direction. This enables the magnification of the optical system to be changed only at the plane rectangular to tracks. More specifically, the width of the information track direction of the beam may be made wider than the width in the direction rectangular to information tracks, whereby it is made to an oval beam.
COPYRIGHT: (C)1979,JPO&Japio
JP5180778A 1978-04-28 1978-04-28 Optical recorder-reproducer Pending JPS54143606A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP5180778A JPS54143606A (en) 1978-04-28 1978-04-28 Optical recorder-reproducer
US06/033,005 US4272651A (en) 1978-04-28 1979-04-24 Optical system having diode laser light source

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5180778A JPS54143606A (en) 1978-04-28 1978-04-28 Optical recorder-reproducer

Publications (1)

Publication Number Publication Date
JPS54143606A true JPS54143606A (en) 1979-11-09

Family

ID=12897183

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5180778A Pending JPS54143606A (en) 1978-04-28 1978-04-28 Optical recorder-reproducer

Country Status (1)

Country Link
JP (1) JPS54143606A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5123007A (en) * 1986-05-02 1992-06-16 Hitachi, Ltd. Method for recording, reproducing and erasing information and thin film for recording information
JP2001357557A (en) * 2001-05-14 2001-12-26 Matsushita Electric Ind Co Ltd Optical head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5123007A (en) * 1986-05-02 1992-06-16 Hitachi, Ltd. Method for recording, reproducing and erasing information and thin film for recording information
JP2001357557A (en) * 2001-05-14 2001-12-26 Matsushita Electric Ind Co Ltd Optical head

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