JPS54143606A - Optical recorder-reproducer - Google Patents
Optical recorder-reproducerInfo
- 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
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
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)
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 |
-
1978
- 1978-04-28 JP JP5180778A patent/JPS54143606A/en active Pending
Cited By (2)
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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