JPS61158036A - Focus sevo drawing device - Google Patents

Focus sevo drawing device

Info

Publication number
JPS61158036A
JPS61158036A JP27846184A JP27846184A JPS61158036A JP S61158036 A JPS61158036 A JP S61158036A JP 27846184 A JP27846184 A JP 27846184A JP 27846184 A JP27846184 A JP 27846184A JP S61158036 A JPS61158036 A JP S61158036A
Authority
JP
Japan
Prior art keywords
peak
focus
adder
outputted
output
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
JP27846184A
Other versions
JPH0519772B2 (en
Inventor
Norio Matsuda
Original Assignee
Pioneer Electronic 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 Pioneer Electronic Corp filed Critical Pioneer Electronic Corp
Priority to JP27846184A priority Critical patent/JPH0519772B2/ja
Publication of JPS61158036A publication Critical patent/JPS61158036A/en
Publication of JPH0519772B2 publication Critical patent/JPH0519772B2/ja
Anticipated expiration legal-status Critical
Application status is Expired - Fee Related legal-status Critical

Links

Abstract

PURPOSE: To enable to make accurate drawing of focus servo at all times by changing reference potantial that determines timing of drawing of focus servo automatically corresponding to intensity of a light soruce, reflection factor, transmission factor etc. of an irradiated body instead of fixing the reference potential.
CONSTITUTION: The peak value of a focus error signal F transmitted through a switch 11 is held by a peak hole circuit 12, and at the same time, arrival of the (negative) peak vlue is detected by a peak detecting circuit 13. An adder 14 adds the peak held value and specified fixed voltage V1 outputted by a voltage generator 15. An analog switch 16 outputs either of fixed voltage V2 outputted by a voltage generator 17 or output of the adder 14 to a comparator 7 alternatively. A monostable multivibrator 18 is triggered by output of the peak detecting circuit 13, and outputs pulse of specified time width. These and an inverter 19 constitute a reference potential generator 6.
COPYRIGHT: (C)1986,JPO&Japio
JP27846184A 1984-12-28 1984-12-28 Expired - Fee Related JPH0519772B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP27846184A JPH0519772B2 (en) 1984-12-28 1984-12-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP27846184A JPH0519772B2 (en) 1984-12-28 1984-12-28

Publications (2)

Publication Number Publication Date
JPS61158036A true JPS61158036A (en) 1986-07-17
JPH0519772B2 JPH0519772B2 (en) 1993-03-17

Family

ID=17597649

Family Applications (1)

Application Number Title Priority Date Filing Date
JP27846184A Expired - Fee Related JPH0519772B2 (en) 1984-12-28 1984-12-28

Country Status (1)

Country Link
JP (1) JPH0519772B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165826A (en) * 1985-01-16 1986-07-26 Sanyo Electric Co Ltd Focus servo pull-in circuit
JPH0264918A (en) * 1988-08-31 1990-03-05 Matsushita Electric Ind Co Ltd Focus controller
JPH02163730A (en) * 1988-12-16 1990-06-25 Matsushita Electric Ind Co Ltd Projection type display device
US5901122A (en) * 1995-10-18 1999-05-04 Sony Corporation Focus drive circuit and focus search method based on relative positional relationship between disc and objective lens
US7817508B2 (en) 2006-07-28 2010-10-19 Sony Computer Entertainment Inc. Optical disk unit, control method for optical disk unit, and computer readable storage medium

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0667205U (en) * 1993-03-05 1994-09-22 市光工業株式会社 Wiring grommet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61165826A (en) * 1985-01-16 1986-07-26 Sanyo Electric Co Ltd Focus servo pull-in circuit
JPH0471254B2 (en) * 1985-01-16 1992-11-13 Sanyo Electric Co
JPH0264918A (en) * 1988-08-31 1990-03-05 Matsushita Electric Ind Co Ltd Focus controller
JP2553655B2 (en) * 1988-08-31 1996-11-13 松下電器産業株式会社 Focus control device
JPH02163730A (en) * 1988-12-16 1990-06-25 Matsushita Electric Ind Co Ltd Projection type display device
US5901122A (en) * 1995-10-18 1999-05-04 Sony Corporation Focus drive circuit and focus search method based on relative positional relationship between disc and objective lens
US7817508B2 (en) 2006-07-28 2010-10-19 Sony Computer Entertainment Inc. Optical disk unit, control method for optical disk unit, and computer readable storage medium

Also Published As

Publication number Publication date
JPH0519772B2 (en) 1993-03-17

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Legal Events

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