JPS57189352A - Tracking device - Google Patents
Tracking deviceInfo
- Publication number
- JPS57189352A JPS57189352A JP7297281A JP7297281A JPS57189352A JP S57189352 A JPS57189352 A JP S57189352A JP 7297281 A JP7297281 A JP 7297281A JP 7297281 A JP7297281 A JP 7297281A JP S57189352 A JPS57189352 A JP S57189352A
- Authority
- JP
- Japan
- Prior art keywords
- sample value
- sample
- switch
- circuit
- goes
- 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
- Optical Recording Or Reproduction (AREA)
Abstract
PURPOSE:To perform stable tracking in a servo system requiring DC gains by comparing the 1st, 2nd sample holding circuits and turning a tracking mirror always in the direction where the smaller sample value is taken in. CONSTITUTION:The respecive sample values 18a, 18b of sample holding circuits 15a, 15b are compared in a comparator 29, and the analog switch 31a or 31b on the side where the smaller sample value is taken in is turned on by the output signal 30 thereof. More specifically, if 18a<18b, the switch 31a goes on and the sample value 18a is fed to the next circuit. If 18a>18b, the switch 31b goes on and the sample value 18b is inverted by an inversion amplifier 32 and is fed to the next circuit. These signals are added in an adder 33, the output thereof is supplied via an offset removing circuit 34 and a low-pass filter 20 to a driving circuit 21.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7297281A JPS57189352A (en) | 1981-05-13 | 1981-05-13 | Tracking device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7297281A JPS57189352A (en) | 1981-05-13 | 1981-05-13 | Tracking device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57189352A true JPS57189352A (en) | 1982-11-20 |
Family
ID=13504806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7297281A Pending JPS57189352A (en) | 1981-05-13 | 1981-05-13 | Tracking device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57189352A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0253328A2 (en) * | 1986-07-11 | 1988-01-20 | Hitachi, Ltd. | Light spot position control system and method by sampling servo |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52137330A (en) * | 1976-05-13 | 1977-11-16 | Olympus Optical Co Ltd | Device for holding peak value |
-
1981
- 1981-05-13 JP JP7297281A patent/JPS57189352A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS52137330A (en) * | 1976-05-13 | 1977-11-16 | Olympus Optical Co Ltd | Device for holding peak value |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0253328A2 (en) * | 1986-07-11 | 1988-01-20 | Hitachi, Ltd. | Light spot position control system and method by sampling servo |
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