JPS5680838A - Optical information reader - Google Patents
Optical information readerInfo
- Publication number
- JPS5680838A JPS5680838A JP15627779A JP15627779A JPS5680838A JP S5680838 A JPS5680838 A JP S5680838A JP 15627779 A JP15627779 A JP 15627779A JP 15627779 A JP15627779 A JP 15627779A JP S5680838 A JPS5680838 A JP S5680838A
- Authority
- JP
- Japan
- Prior art keywords
- lens
- photodetector
- pit
- light
- base part
- 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
- Optical Head (AREA)
Abstract
PURPOSE: To eliminate the beam splitter as well as reduce the space, by providing the base part having no lens function around an object lens in a doughnut form and attaching the photodetector to the base part.
CONSTITUTION: The base part 12 having no lens function is provided around the object lens 4, and the photodetector 13 is attached to the part 12. In such constitution, the laser beam enters the lens 4 again at the part where no pit 7 of the disk 5 exists, and the intensity of light has such distribution 14 as shown in the figure at the part of the pit 7. Thus the light comes out of the lens 4 on the coming-back path of the light. As a result, the laser beam is irradiated also by the photodetector 13 at the part of the pit 7, enabling the reception of signals. The beam splitter can be excluded to reduce the space.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15627779A JPS5680838A (en) | 1979-11-30 | 1979-11-30 | Optical information reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15627779A JPS5680838A (en) | 1979-11-30 | 1979-11-30 | Optical information reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5680838A true JPS5680838A (en) | 1981-07-02 |
Family
ID=15624291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15627779A Pending JPS5680838A (en) | 1979-11-30 | 1979-11-30 | Optical information reader |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5680838A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0081650A2 (en) * | 1981-12-10 | 1983-06-22 | Discovision Associates | Apparatus for reading an angularly multiplexed optical recording medium |
| JPS6234342A (en) * | 1985-08-08 | 1987-02-14 | Omron Tateisi Electronics Co | Optical information processor |
-
1979
- 1979-11-30 JP JP15627779A patent/JPS5680838A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0081650A2 (en) * | 1981-12-10 | 1983-06-22 | Discovision Associates | Apparatus for reading an angularly multiplexed optical recording medium |
| JPS6234342A (en) * | 1985-08-08 | 1987-02-14 | Omron Tateisi Electronics Co | Optical information processor |
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