GR3005801T3 - - Google Patents

Info

Publication number
GR3005801T3
GR3005801T3 GR920402123T GR920402123T GR3005801T3 GR 3005801 T3 GR3005801 T3 GR 3005801T3 GR 920402123 T GR920402123 T GR 920402123T GR 920402123 T GR920402123 T GR 920402123T GR 3005801 T3 GR3005801 T3 GR 3005801T3
Authority
GR
Greece
Prior art keywords
focus
control circuit
order
control amplifier
set voltage
Prior art date
Application number
GR920402123T
Other languages
English (en)
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 filed Critical
Publication of GR3005801T3 publication Critical patent/GR3005801T3/el

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
    • H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device
    • H03F1/304—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device and using digital means
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0901—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for track following only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/094—Methods and circuits for servo offset compensation
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0909—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by astigmatic methods
GR920402123T 1987-09-30 1992-09-24 GR3005801T3 (el)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19873732997 DE3732997A1 (de) 1987-09-30 1987-09-30 Geraet zur wiedergabe von daten

Publications (1)

Publication Number Publication Date
GR3005801T3 true GR3005801T3 (el) 1993-06-07

Family

ID=6337266

Family Applications (1)

Application Number Title Priority Date Filing Date
GR920402123T GR3005801T3 (el) 1987-09-30 1992-09-24

Country Status (10)

Country Link
EP (1) EP0309719B1 (el)
JP (1) JP2956770B2 (el)
KR (1) KR960016359B1 (el)
AT (1) ATE78624T1 (el)
DE (2) DE3732997A1 (el)
DK (1) DK548288A (el)
ES (1) ES2034068T3 (el)
GR (1) GR3005801T3 (el)
HK (1) HK5696A (el)
HU (1) HUT63010A (el)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03115918U (el) * 1990-02-28 1991-12-02
DE4102857A1 (de) * 1991-01-31 1992-08-06 Thomson Brandt Gmbh Verfahren zum fokussieren eines lichtstrahls
DE102006020830B4 (de) * 2006-05-04 2014-02-13 Siemens Aktiengesellschaft Regler für einen Hochfrequenzverstärker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS598144A (ja) * 1982-07-05 1984-01-17 Trio Kenwood Corp 光学的情報読取装置
JPS61177646A (ja) * 1985-02-04 1986-08-09 インタ−ナショナル　ビジネス　マシ−ンズ　コ−ポレ−ション 光学デイスク装置
CA1261467A (en) * 1985-11-28 1989-09-26 Akira Minami Focus servomechanism control system of optical disc system having offset setting means
DE3605561A1 (de) * 1986-02-21 1987-08-27 Thomson Brandt Gmbh Verfahren zur kompensation der offset-spannung eines regelverstaerkers und schaltungsanordnung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
JPH01109539A (ja) 1989-04-26
HK5696A (en) 1996-01-19
DK548288A (da) 1989-03-31
KR960016359B1 (en) 1996-12-09
EP0309719A1 (de) 1989-04-05
ES2034068T3 (es) 1993-04-01
DK548288D0 (da) 1988-09-30
DE3873004D1 (de) 1992-08-27
HUT63010A (en) 1993-06-28
ATE78624T1 (de) 1992-08-15
JP2956770B2 (ja) 1999-10-04
EP0309719B1 (de) 1992-07-22
DE3732997A1 (de) 1989-04-13

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