JPS6459637A - Optical information recording and reproducing device - Google Patents

Optical information recording and reproducing device

Info

Publication number
JPS6459637A
JPS6459637A JP21544487A JP21544487A JPS6459637A JP S6459637 A JPS6459637 A JP S6459637A JP 21544487 A JP21544487 A JP 21544487A JP 21544487 A JP21544487 A JP 21544487A JP S6459637 A JPS6459637 A JP S6459637A
Authority
JP
Japan
Prior art keywords
ground
coil
reg1
current
voltage
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
Application number
JP21544487A
Other languages
Japanese (ja)
Other versions
JP2685451B2 (en
Inventor
Satoshi Shikichi
Shigeto Kanda
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.)
Canon Inc
Original Assignee
Canon Inc
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 Canon Inc filed Critical Canon Inc
Priority to JP62215444A priority Critical patent/JP2685451B2/en
Publication of JPS6459637A publication Critical patent/JPS6459637A/en
Application granted granted Critical
Publication of JP2685451B2 publication Critical patent/JP2685451B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To attain a small sized and low-cost voltage source by using a reference level of a signal fed to a spot moving means as a ground so as to connect a current flowing to the spot moving means to ground without giving to a reference voltage source of an analog signal. CONSTITUTION:A reference voltage Vref is formed from a power supply VCC by resistors R1, REG1 in a tracking control circuit 117. A resistor R5 connected to a plus terminal of a power operational amplifier 204 and a resistor R6 con nected to one terminal of a tracking coil 111 are connected to ground to use the voltage reference fed to the coil 111 as ground. That is, with the coil current zero, the applied voltage is a ground potential. Since the current IACT flowing to the coil 111 does not flow to the reference power source REG1, a small capacity is enough for the REG1. Thus, the reference power supply is made inexpensive and small in size. Since no fluctuation in the Vref due to a large current is caused, stable servo operation is realized. The above is applied similar ly to the focusing servo.
JP62215444A 1987-08-31 1987-08-31 Optical information recording / reproducing device Expired - Fee Related JP2685451B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62215444A JP2685451B2 (en) 1987-08-31 1987-08-31 Optical information recording / reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62215444A JP2685451B2 (en) 1987-08-31 1987-08-31 Optical information recording / reproducing device

Publications (2)

Publication Number Publication Date
JPS6459637A true JPS6459637A (en) 1989-03-07
JP2685451B2 JP2685451B2 (en) 1997-12-03

Family

ID=16672457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62215444A Expired - Fee Related JP2685451B2 (en) 1987-08-31 1987-08-31 Optical information recording / reproducing device

Country Status (1)

Country Link
JP (1) JP2685451B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108996343A (en) * 2017-06-07 2018-12-14 株式会社日立大厦系统 Lift checking system and elevator

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5938936A (en) * 1982-08-28 1984-03-03 Sony Corp Servo control circuit of information reproducer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5938936A (en) * 1982-08-28 1984-03-03 Sony Corp Servo control circuit of information reproducer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108996343A (en) * 2017-06-07 2018-12-14 株式会社日立大厦系统 Lift checking system and elevator

Also Published As

Publication number Publication date
JP2685451B2 (en) 1997-12-03

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Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees