JPS5661045A - Optical information reader - Google Patents
Optical information readerInfo
- Publication number
- JPS5661045A JPS5661045A JP13699779A JP13699779A JPS5661045A JP S5661045 A JPS5661045 A JP S5661045A JP 13699779 A JP13699779 A JP 13699779A JP 13699779 A JP13699779 A JP 13699779A JP S5661045 A JPS5661045 A JP S5661045A
- Authority
- JP
- Japan
- Prior art keywords
- prism
- disc
- light
- polarized
- detection
- 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
Links
Landscapes
- Automatic Focus Adjustment (AREA)
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE:To enable easily to detect tracking error even with a 3-beam system, by providing a cylindrical lens and a detection prism having reflection surface which is set to have almost critical angle to one light in the reflected light flux. CONSTITUTION:The light from a laser light source 21 is fed to relay lenses 22A, 22B locating a diffraction grating 23 between them to form three beams, the beams are made in parallel at a collimator lens 24 and converged into a disc 28 via a polarized prism 25, 1/4 wave length plate 26, and objective lens 27. The reflected light flux from the disc 28 is incident to a detection prism 31 via the polarized prism 25. A reflecting plane 32 of the detection prism 31 is set to parallel reflection light flux so that it has almost critical angle, and a convex cylindrical lens 33 is provided between the polarized prism 25 and the detection prism 31, and the light is converged only broadwise the track 29 formed on the disc 28 and received at a photodetector 34.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13699779A JPS5661045A (en) | 1979-10-25 | 1979-10-25 | Optical information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13699779A JPS5661045A (en) | 1979-10-25 | 1979-10-25 | Optical information reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5661045A true JPS5661045A (en) | 1981-05-26 |
JPH0120498B2 JPH0120498B2 (en) | 1989-04-17 |
Family
ID=15188368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13699779A Granted JPS5661045A (en) | 1979-10-25 | 1979-10-25 | Optical information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5661045A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0050967A1 (en) * | 1980-10-25 | 1982-05-05 | Olympus Optical Co., Ltd. | Signal detection system for use in an optically operating reproducing apparatus |
US5128919A (en) * | 1987-11-16 | 1992-07-07 | Sony Corporation | Apparatus for reproducing an optically recorded information |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54125005A (en) * | 1978-03-23 | 1979-09-28 | Olympus Optical Co Ltd | Optical reading method |
-
1979
- 1979-10-25 JP JP13699779A patent/JPS5661045A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54125005A (en) * | 1978-03-23 | 1979-09-28 | Olympus Optical Co Ltd | Optical reading method |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0050967A1 (en) * | 1980-10-25 | 1982-05-05 | Olympus Optical Co., Ltd. | Signal detection system for use in an optically operating reproducing apparatus |
US5128919A (en) * | 1987-11-16 | 1992-07-07 | Sony Corporation | Apparatus for reproducing an optically recorded information |
Also Published As
Publication number | Publication date |
---|---|
JPH0120498B2 (en) | 1989-04-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
LAPS | Cancellation because of no payment of annual fees |