JPS5737749A - Optical information reader - Google Patents
Optical information readerInfo
- Publication number
- JPS5737749A JPS5737749A JP11446580A JP11446580A JPS5737749A JP S5737749 A JPS5737749 A JP S5737749A JP 11446580 A JP11446580 A JP 11446580A JP 11446580 A JP11446580 A JP 11446580A JP S5737749 A JPS5737749 A JP S5737749A
- Authority
- JP
- Japan
- Prior art keywords
- prism
- photodetector
- reflected light
- disk
- reflected
- 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 Recording Or Reproduction (AREA)
Abstract
PURPOSE:To detect a track error securely by providing a photodetecting element between a disk and a prism having a reflecting surface nearly at a critical angle to the optical axis of reflected light from the disk while detecting a focus error by causing the reflected light to strike the prism. CONSTITUTION:Reflected light from a disk 26 is condensed by an objective 25 to pass through a quarter-wavelength plate 24. Between the 1st polarizing prism 23 and quarter-wavelength plate 24, and 2nd small polarizing prism 29 is arranged. Luminous flux reflected by the 1st polarizing prism 23 is incident to a detection prism 27 having the reflecting surface 27a set nearly at a critical angle and its reflected light is caused to strike the 1st photodetector 28 having two split photodetection areas 28A and 28B. Luminous flux in the vicinity of the optical axis which is reflected by the 2nd polarizing prism 29 is photodetected by the 2nd photodetector 30 having four split photodetection areas 30A-30D. From the output of the 1st photodetector 28, a focus error signal is obtained and from that of the 2nd photodetector 30, a track error signal is also obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11446580A JPS5737749A (en) | 1980-08-19 | 1980-08-19 | Optical information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11446580A JPS5737749A (en) | 1980-08-19 | 1980-08-19 | Optical information reader |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5737749A true JPS5737749A (en) | 1982-03-02 |
Family
ID=14638411
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11446580A Pending JPS5737749A (en) | 1980-08-19 | 1980-08-19 | Optical information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5737749A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007007956A1 (en) * | 2005-07-07 | 2007-01-18 | Moon Sung Byoun | The inner cap for refilling |
-
1980
- 1980-08-19 JP JP11446580A patent/JPS5737749A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2007007956A1 (en) * | 2005-07-07 | 2007-01-18 | Moon Sung Byoun | The inner cap for refilling |
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