GB1027645A - Improvements in and relating to television receivers - Google Patents

Improvements in and relating to television receivers

Info

Publication number
GB1027645A
GB1027645A GB319563A GB319563A GB1027645A GB 1027645 A GB1027645 A GB 1027645A GB 319563 A GB319563 A GB 319563A GB 319563 A GB319563 A GB 319563A GB 1027645 A GB1027645 A GB 1027645A
Authority
GB
United Kingdom
Prior art keywords
focusing grid
magnets
capacitor
earth
electron beam
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
GB319563A
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.)
Blaupunkt Werke GmbH
Original Assignee
Blaupunkt Werke 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
Priority claimed from DEB65855A external-priority patent/DE1144758B/en
Application filed by Blaupunkt Werke GmbH filed Critical Blaupunkt Werke GmbH
Publication of GB1027645A publication Critical patent/GB1027645A/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
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/16—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level
    • H04N5/18—Circuitry for reinsertion of dc and slowly varying components of signal; Circuitry for preservation of black or white level by means of "clamp" circuit operated by switching circuit
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
    • H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
    • H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
    • H04N3/26—Modifications of scanning arrangements to improve focusing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/72—Modifying the appearance of television pictures by optical filters or diffusing screens

Abstract

1,027,645. Television. BLAUPUNKTWERKE G.m.b.H. Jan. 25, 1963 [Feb. 8, 1962], No. 3195/63. Heading H4F. [Also in Division H1D] In a television receiver in which the line structure of the reproduced image is eliminated by elongating the cross-section of the electron beam by means of magnets 33 while applying a negative D.C. potential to the focusing grid 30 (see Division H1) the drive of the video output stage 25 is increased by connecting the cathode of valve 25 to earth through a diode 42. The negative bias applied to the focusing grid is derived from a pulsed voltage present in the line time base stage 36. With the changeover switches 29, 32 in the position shown the magnets 33 are de-energized and the usual positive voltage is applied to the focusing grid by voltage divider 31. In another embodiment the capacitor 43 in the cathode circuit of video output stage 25 is connected to earth through the capacitor 28 in the focusing grid circuit whenever the switch 29 is in the position for applying a negative bias to the focusing grid. An A.C. potential dependent upon the deflection of the electron beam may also be applied to the focusing grid.
GB319563A 1962-02-08 1963-01-25 Improvements in and relating to television receivers Expired GB1027645A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB65855A DE1144758B (en) 1962-02-08 1962-02-08 Television receiver with a picture tube

Publications (1)

Publication Number Publication Date
GB1027645A true GB1027645A (en) 1966-04-27

Family

ID=6974933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB319563A Expired GB1027645A (en) 1962-02-08 1963-01-25 Improvements in and relating to television receivers

Country Status (1)

Country Link
GB (1) GB1027645A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142207A (en) * 1983-06-22 1985-01-09 Raytheon Co Pseudo-raster weather display apparatus
GB2294186A (en) * 1994-10-14 1996-04-17 Ibm Raster demodulation apparatus reduces appearance of line structure
GB2297422A (en) * 1995-01-24 1996-07-31 Ibm Raster demodulation
WO1996023316A1 (en) * 1995-01-24 1996-08-01 International Business Machines Corporation Raster demodulation apparatus and method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2142207A (en) * 1983-06-22 1985-01-09 Raytheon Co Pseudo-raster weather display apparatus
US4678969A (en) * 1983-06-22 1987-07-07 Raytheon Company Pseudo-raster weather display apparatus
GB2294186A (en) * 1994-10-14 1996-04-17 Ibm Raster demodulation apparatus reduces appearance of line structure
GB2297422A (en) * 1995-01-24 1996-07-31 Ibm Raster demodulation
WO1996023316A1 (en) * 1995-01-24 1996-08-01 International Business Machines Corporation Raster demodulation apparatus and method
US6268705B1 (en) 1995-01-24 2001-07-31 International Business Machines Corporation Raster demodulation apparatus and method

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