JPS6439637A - Optical information recording and reproducing device - Google Patents

Optical information recording and reproducing device

Info

Publication number
JPS6439637A
JPS6439637A JP19521187A JP19521187A JPS6439637A JP S6439637 A JPS6439637 A JP S6439637A JP 19521187 A JP19521187 A JP 19521187A JP 19521187 A JP19521187 A JP 19521187A JP S6439637 A JPS6439637 A JP S6439637A
Authority
JP
Japan
Prior art keywords
error
servo
zero
focus
prescribed value
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
JP19521187A
Other languages
Japanese (ja)
Other versions
JP2625438B2 (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 JP62195211A priority Critical patent/JP2625438B2/en
Publication of JPS6439637A publication Critical patent/JPS6439637A/en
Application granted granted Critical
Publication of JP2625438B2 publication Critical patent/JP2625438B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Optical Recording Or Reproduction (AREA)

Abstract

PURPOSE:To eliminate the errors of a focus error signal and a tracking error signal by providing an adjusting means to eliminate the error generated in a servo after a servo pull-in. CONSTITUTION:When a focus servo is supplied, a focus error A is not zero and the error remains. Here, the voltage of the error A is detected by a focusing controller 305 and an offset voltage from an offset circuit 301 is outputted to a B point. Thus, the error A can be in the neighborhood of zero. That the error is really a prescribed value is checked and when it is not the prescribed value, an inverse offset is further given. Thus, the focus error can be the zero or the prescribed value quickly. Consequently, accurate recording and reproducing can be attained. It can be applied to a tracking servo as well.
JP62195211A 1987-08-06 1987-08-06 Optical information recording / reproducing device Expired - Fee Related JP2625438B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62195211A JP2625438B2 (en) 1987-08-06 1987-08-06 Optical information recording / reproducing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP62195211A JP2625438B2 (en) 1987-08-06 1987-08-06 Optical information recording / reproducing device

Publications (2)

Publication Number Publication Date
JPS6439637A true JPS6439637A (en) 1989-02-09
JP2625438B2 JP2625438B2 (en) 1997-07-02

Family

ID=16337306

Family Applications (1)

Application Number Title Priority Date Filing Date
JP62195211A Expired - Fee Related JP2625438B2 (en) 1987-08-06 1987-08-06 Optical information recording / reproducing device

Country Status (1)

Country Link
JP (1) JP2625438B2 (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0740368A (en) * 1993-07-30 1995-02-10 Inoac Corp Production of composite-color elastic paving material made of rubber

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0740368A (en) * 1993-07-30 1995-02-10 Inoac Corp Production of composite-color elastic paving material made of rubber

Also Published As

Publication number Publication date
JP2625438B2 (en) 1997-07-02

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Legal Events

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