JPS5611630A - Information reproducing unit - Google Patents
Information reproducing unitInfo
- Publication number
- JPS5611630A JPS5611630A JP8773679A JP8773679A JPS5611630A JP S5611630 A JPS5611630 A JP S5611630A JP 8773679 A JP8773679 A JP 8773679A JP 8773679 A JP8773679 A JP 8773679A JP S5611630 A JPS5611630 A JP S5611630A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- recording medium
- collecting
- light
- cylindrical
- 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
Abstract
PURPOSE: To make compact the unit, by collecting the light of semiconductor laser on the recording medium via two cylindrical and collecting lenses, picking up the reflection light with the specified beam splitter and adjusting the distance between the collecting lens and the recording medium via the light detector.
CONSTITUTION: The beam of the semiconductor laser 1 is collected on the recording medium 9 via the coupling lens 2, cylindrical lens 3, polarized beam splitter 4, cylindrical lens 5, λ/4 plate 6, reflection plate 7, and converging lens 8. The reflection light passes through the collecting lens 8 and the direction of X-axis of parallel beam is focussed to the focus of the lens 5, and the Y direction beam is focussed to the focus of the cylindrical lens 10 via the beam splitter 4. The light detection means 11 is provided at the intermediate position, the output difference (a+c)-(b+d) of the detector paris opposed is taken as error signal, allowing to control the distance between the converging lens 8 and the recording medium 9 at constant. Thus, the unit can be made compact.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8773679A JPS5611630A (en) | 1979-07-10 | 1979-07-10 | Information reproducing unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP8773679A JPS5611630A (en) | 1979-07-10 | 1979-07-10 | Information reproducing unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5611630A true JPS5611630A (en) | 1981-02-05 |
Family
ID=13923200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP8773679A Pending JPS5611630A (en) | 1979-07-10 | 1979-07-10 | Information reproducing unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5611630A (en) |
-
1979
- 1979-07-10 JP JP8773679A patent/JPS5611630A/en active Pending
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