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GB1452330A - Reading disc-recordings - Google Patents

Reading disc-recordings

Info

Publication number
GB1452330A
GB1452330A GB5185073A GB5185073A GB1452330A GB 1452330 A GB1452330 A GB 1452330A GB 5185073 A GB5185073 A GB 5185073A GB 5185073 A GB5185073 A GB 5185073A GB 1452330 A GB1452330 A GB 1452330A
Authority
GB
United Kingdom
Prior art keywords
control
disc
radial
tangential
signal
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.)
Expired
Application number
GB5185073A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries Ltd
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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1452330A publication Critical patent/GB1452330A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/7605—Television signal recording on discs or drums
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D3/00—Control of position or direction
    • G05D3/12—Control of position or direction using feedback
    • G05D3/14—Control of position or direction using feedback using an analogue comparing device
    • 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
    • G11B7/081—Disposition or mounting of heads or light sources relatively to record carriers for time base error correction by moving the light beam
    • 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
    • G11B7/095—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 discs, e.g. for compensation of eccentricity or wobble
    • G11B7/0953—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 discs, e.g. for compensation of eccentricity or wobble to compensate for eccentricity of the disc or disc tracks

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optical Recording Or Reproduction (AREA)
  • Moving Of The Head To Find And Align With The Track (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

1452330 Automatic control PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 8 Nov 1973 [11 Nov 1972] 51850/73 Heading G3R In a system for reading a disc shaped record carrier 1 the tangential position of an information scanning point a is controlled in response to a periodic signal derived from a track on the disc, the signal being filtered such that the control system as a whole has a band pass characteristic, the frequency corresponding to the speed of the disc lying within the pass band. The object is to cause the scanning point to follow eccentricities or speed variations of the disc without the use of a reference oscillator, which is prior art. The embodiment also provides for radial positioning and the disc may be magnetic although an optical system for a video signal is described. Light from a source 4 is reflected at 5, 6, 9 and 11, several tracks of the record 1 at point a being imaged on photo-electric detector 18. The signal from 19 is used for tangential control and 20 for radial control. Horizontal synchronized pulses from the video signal are separated at 26 and filtered as specified at 27 to control the energization of windings attached to mirror 11, which is in a magnetic field Fig. 3 (not shown). The radial control is not fully described, but the outputs from photo-cells 20 control the angle of mirror 9. It is mentioned that radial control can be effected from the tangential system, using a 90 degrees lag.
GB5185073A 1972-11-11 1973-11-08 Reading disc-recordings Expired GB1452330A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7215306A NL7215306A (en) 1972-11-11 1972-11-11

Publications (1)

Publication Number Publication Date
GB1452330A true GB1452330A (en) 1976-10-13

Family

ID=19817346

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5185073A Expired GB1452330A (en) 1972-11-11 1973-11-08 Reading disc-recordings

Country Status (16)

Country Link
JP (1) JPS5531527B2 (en)
AT (1) AT330258B (en)
BE (1) BE807159A (en)
BR (1) BR7308761D0 (en)
CA (1) CA1005908A (en)
CH (1) CH588123A5 (en)
DE (1) DE2353673C2 (en)
DK (1) DK134875B (en)
ES (1) ES420411A1 (en)
FR (1) FR2327607A1 (en)
GB (1) GB1452330A (en)
IT (1) IT999742B (en)
NL (1) NL7215306A (en)
NO (1) NO141137C (en)
SE (1) SE395558B (en)
ZA (1) ZA738175B (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1577132A (en) * 1976-03-19 1980-10-22 Rca Corp Compensation apparatus for a servo system with periodic command signals
JPS52120805A (en) * 1976-04-02 1977-10-11 Sony Corp Servo apparatus
CA1198766A (en) * 1981-04-20 1985-12-31 Atsuo Tanaka Magnetic rolls and a method of making the same
JPS5940241U (en) * 1982-09-04 1984-03-14 大豊工業株式会社 Axis of rotation
DE8322639U1 (en) * 1983-08-05 1983-12-01 Uranit GmbH, 5170 Jülich Guide rollers for paper, foil finishing and printing machines

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3381086A (en) * 1962-08-16 1968-04-30 Minnesota Mining & Mfg Reproduction of television signals from photographic disc recordings
US3673412A (en) * 1970-03-02 1972-06-27 Trw Inc Radiant energy beam scanning method and apparatus
US3711641A (en) * 1971-03-22 1973-01-16 Rca Corp Velocity adjusting system

Also Published As

Publication number Publication date
ES420411A1 (en) 1976-04-16
DK134875B (en) 1977-01-31
AT330258B (en) 1976-06-25
BR7308761D0 (en) 1974-09-05
FR2327607A1 (en) 1977-05-06
NO141137C (en) 1980-01-16
FR2327607B1 (en) 1978-04-21
CH588123A5 (en) 1977-05-31
NL7215306A (en) 1974-05-14
DE2353673A1 (en) 1974-05-16
JPS5531527B2 (en) 1980-08-19
IT999742B (en) 1976-03-10
DK134875C (en) 1977-06-20
ZA738175B (en) 1975-05-28
SE395558B (en) 1977-08-15
DE2353673C2 (en) 1982-05-27
AU6231873A (en) 1975-05-15
ATA939773A (en) 1975-09-15
CA1005908A (en) 1977-02-22
BE807159A (en) 1974-05-09
JPS50707A (en) 1975-01-07
NO141137B (en) 1979-10-08

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee