JPS5769534A - Optical track tracing device - Google Patents
Optical track tracing deviceInfo
- Publication number
- JPS5769534A JPS5769534A JP55142910A JP14291080A JPS5769534A JP S5769534 A JPS5769534 A JP S5769534A JP 55142910 A JP55142910 A JP 55142910A JP 14291080 A JP14291080 A JP 14291080A JP S5769534 A JPS5769534 A JP S5769534A
- Authority
- JP
- Japan
- Prior art keywords
- diffracted light
- tracks
- parts
- photodetector
- light
- 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
Abstract
PURPOSE:To reduce the deviation signal due to beam deflection to trace tracks accurately, by providing two photodetecting parts, at least, which detect only light components other than 0-order light components in the photodetector which receives the diffracted light from information tracks. CONSTITUTION:A photodetector 7 consists of photodetecting parts D1 and D2 and a dark part B and has symmetrical axis O arranged in parallel with tracks approximately. The O-order diffracted light of the diffracted light of tracks is irradiated to the dark part B. The primary diffracted light is detected but the 0-order diffracted light is not detected by photodetecting parts D1 and D2. The difference between output signals of parts D1 and D2 becomes a track control signal. Consequently, the deviation signal due to beam deflection is reduced to make an accurate track tracking possible.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55142910A JPS5769534A (en) | 1980-10-15 | 1980-10-15 | Optical track tracing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55142910A JPS5769534A (en) | 1980-10-15 | 1980-10-15 | Optical track tracing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5769534A true JPS5769534A (en) | 1982-04-28 |
JPH0210491B2 JPH0210491B2 (en) | 1990-03-08 |
Family
ID=15326452
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP55142910A Granted JPS5769534A (en) | 1980-10-15 | 1980-10-15 | Optical track tracing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5769534A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61216143A (en) * | 1985-03-20 | 1986-09-25 | Matsushita Electric Ind Co Ltd | Optical head |
US5617389A (en) * | 1993-06-08 | 1997-04-01 | Pioneer Electronic Corporation | Method of reproducing information of optical disc, method of recording and reproducing the same, apparatus for reproducing the same, and light detecting apparatus used in the reproducing apparatus |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4960702A (en) * | 1972-08-25 | 1974-06-12 | ||
JPS502569A (en) * | 1973-03-02 | 1975-01-11 | ||
JPS51134018A (en) * | 1975-05-16 | 1976-11-20 | Hitachi Ltd | Information regeneration method |
JPS5465007A (en) * | 1977-11-02 | 1979-05-25 | Matsushita Electric Ind Co Ltd | Disc form recording carrier reader |
-
1980
- 1980-10-15 JP JP55142910A patent/JPS5769534A/en active Granted
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4960702A (en) * | 1972-08-25 | 1974-06-12 | ||
JPS502569A (en) * | 1973-03-02 | 1975-01-11 | ||
JPS51134018A (en) * | 1975-05-16 | 1976-11-20 | Hitachi Ltd | Information regeneration method |
JPS5465007A (en) * | 1977-11-02 | 1979-05-25 | Matsushita Electric Ind Co Ltd | Disc form recording carrier reader |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61216143A (en) * | 1985-03-20 | 1986-09-25 | Matsushita Electric Ind Co Ltd | Optical head |
US5617389A (en) * | 1993-06-08 | 1997-04-01 | Pioneer Electronic Corporation | Method of reproducing information of optical disc, method of recording and reproducing the same, apparatus for reproducing the same, and light detecting apparatus used in the reproducing apparatus |
Also Published As
Publication number | Publication date |
---|---|
JPH0210491B2 (en) | 1990-03-08 |
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