JPS6412301A - Servo circuit - Google Patents

Servo circuit

Info

Publication number
JPS6412301A
JPS6412301A JP16793487A JP16793487A JPS6412301A JP S6412301 A JPS6412301 A JP S6412301A JP 16793487 A JP16793487 A JP 16793487A JP 16793487 A JP16793487 A JP 16793487A JP S6412301 A JPS6412301 A JP S6412301A
Authority
JP
Japan
Prior art keywords
voltage
connection point
power source
virtual ground
time
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
JP16793487A
Other languages
Japanese (ja)
Inventor
Kazumasa Ishikawa
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.)
Olympus Corp
Original Assignee
Olympus Optical Co Ltd
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 Olympus Optical Co Ltd filed Critical Olympus Optical Co Ltd
Priority to JP16793487A priority Critical patent/JPS6412301A/en
Publication of JPS6412301A publication Critical patent/JPS6412301A/en
Pending legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Safety Devices In Control Systems (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)

Abstract

PURPOSE:To suppress undesired displacement, by suppressing the supply of an abnormal voltage on an actuator based on the difference of the rise time of a source voltage. CONSTITUTION:In a servo circuit provided with a phase compensation circuit 1, a driver 2, and the actuator 3, the input terminal of the driver 2 is connected to a virtual ground via a transistor (Tr)11, and also, a power source terminal is connected to the virtual ground via a capacitor 12 and a resistor 13. Also, the base of the Tr11 is connected to the connection point 14 of those components. And when the difference exists in rise between the source voltage and the voltage of the virtual ground at the time of applying a power source, the voltage at the connection point 14 goes to the voltage clipped by the base- emitter voltage (VBE) of the Tr11. Thereby, since the Tr11 is energized in the period while the voltage at the connection point 14 stays at VBE, the DC gain of a servo loop can be reduced in the period. In such a way, it is possible to suppress the undesired displacement of an objective lens at the time of applying the power source.
JP16793487A 1987-07-07 1987-07-07 Servo circuit Pending JPS6412301A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16793487A JPS6412301A (en) 1987-07-07 1987-07-07 Servo circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16793487A JPS6412301A (en) 1987-07-07 1987-07-07 Servo circuit

Publications (1)

Publication Number Publication Date
JPS6412301A true JPS6412301A (en) 1989-01-17

Family

ID=15858766

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16793487A Pending JPS6412301A (en) 1987-07-07 1987-07-07 Servo circuit

Country Status (1)

Country Link
JP (1) JPS6412301A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009116491A1 (en) 2008-03-21 2009-09-24 株式会社林原生物化学研究所 Monoclonal antibody specifically recognizing human interferon alpha subtype alpha-8 and mutant protein thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009116491A1 (en) 2008-03-21 2009-09-24 株式会社林原生物化学研究所 Monoclonal antibody specifically recognizing human interferon alpha subtype alpha-8 and mutant protein thereof

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