JPS55157135A - Information reader - Google Patents
Information readerInfo
- Publication number
- JPS55157135A JPS55157135A JP6144379A JP6144379A JPS55157135A JP S55157135 A JPS55157135 A JP S55157135A JP 6144379 A JP6144379 A JP 6144379A JP 6144379 A JP6144379 A JP 6144379A JP S55157135 A JPS55157135 A JP S55157135A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- recording medium
- light beam
- splitter
- separated
- 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
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
PURPOSE: To detect reproduced signals of a good SN ratio independently of the surface state of a recording medium, by irradiating a light beam to information existence regions close to each other on the recording medium.
CONSTITUTION: Light beam 20 from reproducing light source 1 is irradiated onto recording medium as light beams 30A and 30B superposed onto each other partially after separated into two light beams 20A and 20B different in deflection state by splitter 2. In this case, this light beam is set to the same direction, the right-angle direction, the 45° direction, and so on for tracks by the angle of splitter 2. Two reflection lights 40A and 40B from medium 12 are separated by semitransparent mirror 6 and polarizing prism 7 and are led to photodetectors 8A and 8B respectively, and detection outputs 50A and 50B are supplied to differential amplifier 9, and output signal 60 detects information signal 70, and signal 80 obtained by causing signal 60 to pass through LPF11 becomes a tracking signal to drive mirror 4. As a result, reproduced signals of a good SN ratio are always detected.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6144379A JPS55157135A (en) | 1979-05-21 | 1979-05-21 | Information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6144379A JPS55157135A (en) | 1979-05-21 | 1979-05-21 | Information reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55157135A true JPS55157135A (en) | 1980-12-06 |
JPS6223378B2 JPS6223378B2 (en) | 1987-05-22 |
Family
ID=13171204
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6144379A Granted JPS55157135A (en) | 1979-05-21 | 1979-05-21 | Information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55157135A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59127243A (en) * | 1983-01-11 | 1984-07-23 | Matsushita Electric Ind Co Ltd | Optical recording and reproducing device |
JPH02192042A (en) * | 1989-01-19 | 1990-07-27 | Nec Corp | Optical disk device |
JPH0426940A (en) * | 1990-05-21 | 1992-01-30 | Matsushita Electric Ind Co Ltd | Master disk preparing device for optical disk |
JPH06203398A (en) * | 1981-03-31 | 1994-07-22 | Discovision Assoc | Tracking device |
JP2019523403A (en) * | 2016-07-29 | 2019-08-22 | シャンハイ マイクロ エレクトロニクス イクイプメント(グループ)カンパニー リミティド | Diffraction grating measuring device |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5295203A (en) * | 1976-02-05 | 1977-08-10 | Mitsubishi Electric Corp | Information reproduction apparatus |
-
1979
- 1979-05-21 JP JP6144379A patent/JPS55157135A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5295203A (en) * | 1976-02-05 | 1977-08-10 | Mitsubishi Electric Corp | Information reproduction apparatus |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06203398A (en) * | 1981-03-31 | 1994-07-22 | Discovision Assoc | Tracking device |
JPS59127243A (en) * | 1983-01-11 | 1984-07-23 | Matsushita Electric Ind Co Ltd | Optical recording and reproducing device |
JPH0570212B2 (en) * | 1983-01-11 | 1993-10-04 | Matsushita Electric Ind Co Ltd | |
JPH02192042A (en) * | 1989-01-19 | 1990-07-27 | Nec Corp | Optical disk device |
JPH0426940A (en) * | 1990-05-21 | 1992-01-30 | Matsushita Electric Ind Co Ltd | Master disk preparing device for optical disk |
JP2019523403A (en) * | 2016-07-29 | 2019-08-22 | シャンハイ マイクロ エレクトロニクス イクイプメント(グループ)カンパニー リミティド | Diffraction grating measuring device |
Also Published As
Publication number | Publication date |
---|---|
JPS6223378B2 (en) | 1987-05-22 |
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