JPS6353617B2 - - Google Patents
Info
- Publication number
- JPS6353617B2 JPS6353617B2 JP18817580A JP18817580A JPS6353617B2 JP S6353617 B2 JPS6353617 B2 JP S6353617B2 JP 18817580 A JP18817580 A JP 18817580A JP 18817580 A JP18817580 A JP 18817580A JP S6353617 B2 JPS6353617 B2 JP S6353617B2
- Authority
- JP
- Japan
- Prior art keywords
- level
- signal
- focus
- generating
- track
- 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.)
- Expired
Links
- 238000001514 detection method Methods 0.000 claims description 19
- 230000003287 optical effect Effects 0.000 claims description 2
- 230000001678 irradiating effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 4
- 238000013459 approach Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18817580A JPS57113424A (en) | 1980-12-29 | 1980-12-29 | Locked-track detector of recorded-information reader |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP18817580A JPS57113424A (en) | 1980-12-29 | 1980-12-29 | Locked-track detector of recorded-information reader |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57113424A JPS57113424A (en) | 1982-07-14 |
JPS6353617B2 true JPS6353617B2 (US20110158925A1-20110630-C00042.png) | 1988-10-25 |
Family
ID=16219067
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP18817580A Granted JPS57113424A (en) | 1980-12-29 | 1980-12-29 | Locked-track detector of recorded-information reader |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57113424A (US20110158925A1-20110630-C00042.png) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4446546A (en) * | 1981-12-31 | 1984-05-01 | Magnetic Peripherals Inc. | Focus initialization system for optical recording |
JPS5956231A (ja) * | 1982-09-27 | 1984-03-31 | Sony Corp | 光学式デイスクプレ−ヤ |
-
1980
- 1980-12-29 JP JP18817580A patent/JPS57113424A/ja active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS57113424A (en) | 1982-07-14 |