HK5696A - Apparatus for the reproduction of data - Google Patents
Apparatus for the reproduction of dataInfo
- Publication number
- HK5696A HK5696A HK5696A HK5696A HK5696A HK 5696 A HK5696 A HK 5696A HK 5696 A HK5696 A HK 5696A HK 5696 A HK5696 A HK 5696A HK 5696 A HK5696 A HK 5696A
- Authority
- HK
- Hong Kong
- Prior art keywords
- focus
- control circuit
- data
- order
- control amplifier
- Prior art date
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
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Optical Recording Or Reproduction (AREA)
- Circuits Of Receivers In General (AREA)
- Amplifiers (AREA)
- Indexing, Searching, Synchronizing, And The Amount Of Synchronization Travel Of Record Carriers (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Apparatus for the reproduction of data which can be read contactlessly from a recording medium by means of an optical scanning device. Such apparatuses are equipped with a focus control circuit, in order to focus the light beam scanning the data onto the recording medium, and with a track control circuit, in order to be able to guide the light beam on the data tracks. However, the control amplifier (FR) of the focus control circuit is affected by an off-set voltage, which varies with the temperature and ageing of the control amplifier. In order to compensate automatically for the off-set voltage of the control amplifier (FR) of the focus control circuit, an input of the control amplifier (FR) is fed an off-set compensation voltage, which is varied until the high-frequency components of the focus error signal (FE) assume a minimum, since in this case the off-set voltage is optimally compensated. CD players, video-disc players, draw-disc players, magneto-optical equipment. <IMAGE>
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19873732997 DE3732997A1 (en) | 1987-09-30 | 1987-09-30 | DEVICE FOR PLAYING BACK DATA |
Publications (1)
Publication Number | Publication Date |
---|---|
HK5696A true HK5696A (en) | 1996-01-19 |
Family
ID=6337266
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
HK5696A HK5696A (en) | 1987-09-30 | 1996-01-11 | Apparatus for the reproduction of data |
Country Status (10)
Country | Link |
---|---|
EP (1) | EP0309719B1 (en) |
JP (1) | JP2956770B2 (en) |
KR (1) | KR960016359B1 (en) |
AT (1) | ATE78624T1 (en) |
DE (2) | DE3732997A1 (en) |
DK (1) | DK548288A (en) |
ES (1) | ES2034068T3 (en) |
GR (1) | GR3005801T3 (en) |
HK (1) | HK5696A (en) |
HU (1) | HUT63010A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03115918U (en) * | 1990-02-28 | 1991-12-02 | ||
DE4102857A1 (en) * | 1991-01-31 | 1992-08-06 | Thomson Brandt Gmbh | Beam focussing control method for CD player - varying offset compensation voltage fed to focussing control circuit until bit error rate of scanned data signal reaches minimum |
DE102006020830B4 (en) * | 2006-05-04 | 2014-02-13 | Siemens Aktiengesellschaft | Controller for a high-frequency amplifier |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS598144A (en) * | 1982-07-05 | 1984-01-17 | Trio Kenwood Corp | Optical information reader |
JPS61177646A (en) * | 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 | Optical disc |
CA1261467A (en) * | 1985-11-28 | 1989-09-26 | Akira Minami | Focus servomechanism control system of optical disc system having offset setting means |
DE3605561A1 (en) * | 1986-02-21 | 1987-08-27 | Thomson Brandt Gmbh | METHOD FOR COMPENSATING THE OFFSET VOLTAGE OF A CONTROL AMPLIFIER AND CIRCUIT ARRANGEMENT FOR IMPLEMENTING THE METHOD |
-
1987
- 1987-09-30 DE DE19873732997 patent/DE3732997A1/en not_active Withdrawn
-
1988
- 1988-08-19 ES ES198888113479T patent/ES2034068T3/en not_active Expired - Lifetime
- 1988-08-19 AT AT88113479T patent/ATE78624T1/en not_active IP Right Cessation
- 1988-08-19 EP EP88113479A patent/EP0309719B1/en not_active Expired - Lifetime
- 1988-08-19 DE DE8888113479T patent/DE3873004D1/en not_active Expired - Lifetime
- 1988-09-27 KR KR88012456A patent/KR960016359B1/en not_active IP Right Cessation
- 1988-09-29 JP JP63242662A patent/JP2956770B2/en not_active Expired - Lifetime
- 1988-09-30 HU HU885108A patent/HUT63010A/en unknown
- 1988-09-30 DK DK548288A patent/DK548288A/en not_active Application Discontinuation
-
1992
- 1992-09-24 GR GR920402123T patent/GR3005801T3/el unknown
-
1996
- 1996-01-11 HK HK5696A patent/HK5696A/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GR3005801T3 (en) | 1993-06-07 |
EP0309719A1 (en) | 1989-04-05 |
ATE78624T1 (en) | 1992-08-15 |
EP0309719B1 (en) | 1992-07-22 |
KR960016359B1 (en) | 1996-12-09 |
DK548288D0 (en) | 1988-09-30 |
DE3873004D1 (en) | 1992-08-27 |
HUT63010A (en) | 1993-06-28 |
DK548288A (en) | 1989-03-31 |
DE3732997A1 (en) | 1989-04-13 |
JPH01109539A (en) | 1989-04-26 |
ES2034068T3 (en) | 1993-04-01 |
JP2956770B2 (en) | 1999-10-04 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PF | Patent in force | ||
PE | Patent expired |
Effective date: 20080818 |