GB889841A - Improvements in or relating to correction systems for colour cathode ray tubes - Google Patents

Improvements in or relating to correction systems for colour cathode ray tubes

Info

Publication number
GB889841A
GB889841A GB21315/59A GB2131559A GB889841A GB 889841 A GB889841 A GB 889841A GB 21315/59 A GB21315/59 A GB 21315/59A GB 2131559 A GB2131559 A GB 2131559A GB 889841 A GB889841 A GB 889841A
Authority
GB
United Kingdom
Prior art keywords
lines
currents
generators
supplied
correction currents
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
GB21315/59A
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.)
Robert Bosch Fernsehanlagen GmbH
Original Assignee
Fernseh 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 Fernseh GmbH filed Critical Fernseh GmbH
Publication of GB889841A publication Critical patent/GB889841A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00Details of colour television systems
    • H04N9/12Picture reproducers
    • H04N9/16Picture reproducers using cathode ray tubes
    • H04N9/28Arrangements for convergence or focusing

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)

Abstract

889,841. Cathode-ray tube circuits. FERNSEH G.m.b.H. June 22, 1959 [June 20, 1958], No. 21315/59. Class 40(7). In a three-beam shadow-mask cathode ray colour reproducing tube the deflection correction magnets 13, 14 (Fig. 7) for the two beams which are not in the vertical plane of symmetry have supplied thereto, in addition to the normal correction currents from generators G, R, further correction currents derived from voltages produced by modulating in circuits 5, 6 respectively, a frame frequency sawtooth voltage 7 by a parabolic, line frequency, voltage 8 and a line frequency sawtooth voltage 9. The output of modulator 5 comprising the waveform 10 is supplied, via amplifier 11 and transformer 12, in anti-phase to the generators G, R resulting in currents, additional to the normal correction currents, of the form shown in Fig. 4. By adjusting the normal correction currents so that, instead of having errorfree positions along vertical and horizontal central lines as shown in Fig. 1. (the lines 1, 1<SP>1</SP>, 2, 2<SP>1</SP> and 3, 3<SP>1</SP> of which show the green, blue and red raster lines respectively), such positions occur at the upper margin, as shown in Fig. 2, the additional correction currents (Fig. 4) reduce the registration errors at the lower edge to the same small amount present at the centre. The remaining errors (parallelogram errors), i.e. at the side edges where, as shown in Fig. 5, the ends of the lines of the green raster (broken lines) are skewed in relation to those of the red raster (full lines) are compensated by the output of modulator 6 (waveform 22) which is supplied to the generators G, R, via amplifier 15 and transformer 16 and gives rise to currents of the form shown in Fig. 6c. Suitable circuits for the modulators 5 and 6 are described in connection with Fig. 8 (not shown).
GB21315/59A 1958-06-20 1959-06-22 Improvements in or relating to correction systems for colour cathode ray tubes Expired GB889841A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE889841X 1958-06-20

Publications (1)

Publication Number Publication Date
GB889841A true GB889841A (en) 1962-02-21

Family

ID=6834730

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21315/59A Expired GB889841A (en) 1958-06-20 1959-06-22 Improvements in or relating to correction systems for colour cathode ray tubes

Country Status (4)

Country Link
DE (1) DE1075145B (en)
FR (1) FR1227172A (en)
GB (1) GB889841A (en)
NL (1) NL240249A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1279069B (en) * 1967-02-09 1968-10-03 Fernseh Gmbh Circuit for obtaining correction signals to achieve grid coverage in color receiver display tubes
DE1562194C2 (en) * 1968-03-12 1975-09-04 Saba Schwarzwaelder Apparate-Bau-Anstalt August Schwer Soehne Gmbh, 7730 Villingen Circuit arrangement for adjusting the vertical convergence of a color television receiver
DE2025094B2 (en) * 1969-05-29 1971-11-04 CIRCUIT ARRANGEMENT FOR GENERATING A LINE FREQUENCY SAW-TOOTH-SHAPED CORRECTION CURRENT WITH A GRID FREQUENTLY CHANGING AMPLITUDE IN A PICTURE REPLAY DEVICE

Also Published As

Publication number Publication date
DE1075145B (en) 1960-02-11
FR1227172A (en) 1960-08-19
NL240249A (en)

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