HK176795A - Automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support - Google Patents

Automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support

Info

Publication number
HK176795A
HK176795A HK176795A HK176795A HK176795A HK 176795 A HK176795 A HK 176795A HK 176795 A HK176795 A HK 176795A HK 176795 A HK176795 A HK 176795A HK 176795 A HK176795 A HK 176795A
Authority
HK
Hong Kong
Prior art keywords
circuit
servo
scanning
fact
anomalies
Prior art date
Application number
HK176795A
Inventor
Dieter Baas
Werner Nutz
Original Assignee
Thomson Brandt Gmbh
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 Thomson Brandt Gmbh filed Critical Thomson Brandt Gmbh
Publication of HK176795A publication Critical patent/HK176795A/en

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • 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
    • G11B7/0946—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 specially adapted for operation during external perturbations not related to the carrier or servo beam, e.g. vibration
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B21/00—Head arrangements not specific to the method of recording or reproducing
    • G11B21/02—Driving or moving of heads
    • G11B21/10—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following
    • G11B21/106—Track finding or aligning by moving the head ; Provisions for maintaining alignment of the head relative to the track during transducing operation, i.e. track following on disks
    • 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
    • G11B7/0948—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 specially adapted for detection and avoidance or compensation of imperfections on the carrier, e.g. dust, scratches, dropouts

Landscapes

  • Optical Recording Or Reproduction (AREA)
  • Optical Communication System (AREA)
  • Signal Processing For Digital Recording And Reproducing (AREA)

Abstract

An automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support, with a known servo-circuit, for detecting anomalies in the scanning system (1) to whose outputs is connected a gate circuit, providing as necessary a mute control signal at the decoder (2) connected to the scanning system (1) and thus ensuring the mute control of its outputs. According to the invention, anomalies in scanning caused by external faults and/or disc faults, such as scratches, can largely be reduced, in terms of the disturbance caused by this phenomenon, by the fact that a triggering criterion for correction signals can be produced, in the event of anomalies, by sequential address comparison. This is achieved by the fact that a comparator (6) compares any newly read data with the preceding information, which is temporarily stored in a latch circuit (7) and by the fact that a preliminary indication is made available, in the form of a measurement window $g(D) D in order to determine whether the comparison lies outside the measurement window and in order then to emit a correction signal from the comparator (6) to the servo system (3) and by the fact that the scanning system (1) refers back to the last valid scanning point.
HK176795A 1985-04-18 1995-11-16 Automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support HK176795A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19853514035 DE3514035A1 (en) 1985-04-18 1985-04-18 AUTOMATIC CORRECTION SYSTEM FOR THE SERVO CIRCUIT OF A DEVICE WITH OPTICAL SCANNING OF A ROTATING INFORMATION CARRIER
PCT/EP1986/000223 WO1986006200A1 (en) 1985-04-18 1986-04-17 Automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support

Publications (1)

Publication Number Publication Date
HK176795A true HK176795A (en) 1995-11-24

Family

ID=6268493

Family Applications (1)

Application Number Title Priority Date Filing Date
HK176795A HK176795A (en) 1985-04-18 1995-11-16 Automatic correction system for the servo-circuit of a device with optical scanning of a rotating information support

Country Status (8)

Country Link
EP (1) EP0221936B1 (en)
JP (1) JPH0785344B2 (en)
KR (1) KR970006831B1 (en)
AT (1) ATE57785T1 (en)
DE (2) DE3514035A1 (en)
DK (1) DK166055C (en)
HK (1) HK176795A (en)
WO (1) WO1986006200A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3862875B2 (en) * 1998-10-29 2006-12-27 パイオニア株式会社 Disc player
US20050174275A1 (en) * 2002-05-21 2005-08-11 Koninklijke Philips Electronics N.V. Optical disk system with improved playability

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4307418A (en) * 1979-10-12 1981-12-22 Rca Corporation Video disc player system for correlating stylus position with information previously detected from disc
US4313134A (en) * 1979-10-12 1982-01-26 Rca Corporation Track error correction system as for video disc player
JPS57104386A (en) * 1980-12-19 1982-06-29 Trio Kenwood Corp Video disc playback device
US4488278A (en) * 1982-08-17 1984-12-11 Rca Corporation Coding system for digital audio disc record
JPS5936385A (en) * 1982-08-20 1984-02-28 Matsushita Electric Ind Co Ltd Reading circuit of track address
JPS59117762A (en) * 1982-12-24 1984-07-07 Nippon Columbia Co Ltd Disc reproducing device
JPS59167879A (en) * 1983-03-15 1984-09-21 Toshiba Corp Detector of track jump in disc record reproducing system
JPS59201274A (en) * 1983-04-27 1984-11-14 Sony Corp Disk reproducing device
JPS607658A (en) * 1983-06-24 1985-01-16 Victor Co Of Japan Ltd Method for correcting address of disc-like information recording medium
JPS6043270A (en) * 1983-08-19 1985-03-07 Sony Corp Disk player
NL8303565A (en) * 1983-10-17 1985-05-17 Philips Nv Apparatus for displaying information from a plate-shaped optically readable record carrier.

Also Published As

Publication number Publication date
EP0221936A1 (en) 1987-05-20
EP0221936B1 (en) 1990-10-24
DK614386D0 (en) 1986-12-18
WO1986006200A1 (en) 1986-10-23
DK166055B (en) 1993-03-01
ATE57785T1 (en) 1990-11-15
DE3675150D1 (en) 1990-11-29
DK166055C (en) 1993-07-12
KR970006831B1 (en) 1997-04-30
DE3514035A1 (en) 1986-10-23
JPH0785344B2 (en) 1995-09-13
KR880700408A (en) 1988-03-15
JPS62502003A (en) 1987-08-06
DK614386A (en) 1986-12-18

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Legal Events

Date Code Title Description
PF Patent in force
PE Patent expired

Effective date: 20060416