JPS57189352A - Tracking device - Google Patents

Tracking device

Info

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
Application number
JP7297281A
Other languages
Japanese (ja)
Inventor
Kenji Goshima
Kazuo Hirasawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP7297281A priority Critical patent/JPS57189352A/en
Publication of JPS57189352A publication Critical patent/JPS57189352A/en
Pending legal-status Critical Current

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  • 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.
JP7297281A 1981-05-13 1981-05-13 Tracking device Pending JPS57189352A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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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