US2784342A - Circuit for television picture tubes - Google Patents

Circuit for television picture tubes Download PDF

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Publication number
US2784342A
US2784342A US346083A US34608353A US2784342A US 2784342 A US2784342 A US 2784342A US 346083 A US346083 A US 346083A US 34608353 A US34608353 A US 34608353A US 2784342 A US2784342 A US 2784342A
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US
United States
Prior art keywords
sereen
strips
strip
cross
section
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 - Lifetime
Application number
US346083A
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English (en)
Inventor
Adrianus Johannes Wilhel Marie
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.)
Hartford National Bank and Trust Co
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Hartford National Bank and Trust Co
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Publication date
Application filed by Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
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Publication of US2784342A publication Critical patent/US2784342A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/56—Arrangements for controlling cross-section of ray or beam; Arrangements for correcting aberration of beam, e.g. due to lenses
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/16—Picture reproducers using cathode ray tubes
    • H04N9/22—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information
    • H04N9/26—Picture reproducers using cathode ray tubes using the same beam for more than one primary colour information using electron-optical colour selection means, e.g. line grid, deflection means in or near the gun or near the phosphor screen

Definitions

  • This invention relates to a circuit for a television picture tube of which the sereen is.composed of three strips of the same width which are cyclcally repeated and which reproduce the fundamental colours, which screen is scanned in two directions substantially at rght angles to one another, one directon coincidiug with the direction of length of the strips.
  • the picture tube serves solely for the reproducton of colour television images.
  • ode-ray beam of the tube is obtained in such manner that the cross-section of the beam at the area of the sereen scans one coiour strip at the same time, so that one colour only is reproduced,
  • the deflection of. the beam is chosen, for exarnple, to be such that at first a11 strips of one colour, subsequently all strips of the second colour and then allstrips of the third colour are scanned. It is alternatively possible for the strips to be scanned in succession, in which event, for example, a red strip, then a green strip, subsequently a blue strip and then again a red strip, etc. are scanned.
  • the object of the circuit according to the invention is to make the picture tube serviceable not only for reproducing colour irriages, but also for the reproduction of black-white images and, furthermore, for another method f reproducing colour television images which is suitable for a colour television system in which inforrnation is transrnitted about brightness, colour and degree of satuiation of the image to be reproduced.
  • the circuit according to the invention is characterised in that the cathode-ray beam exhibits astigmatism, the largest dimension of the crosssection of the beam at the area of the sereen being substantially equal to three tirnes the width of a strip and the smallest dimerls'ion of: the cross-section at the same area being sbstantially equai to the width of one strip, provision being made of means for varying the orientation and the dimensions of the cross-section of the beam with respect to the direction of iength of the strips.
  • Fig. 1 shows a piuraiity of strips of the sereen, some iorms of the crosssection of the beam at the areaof the sereen being shown, which is also the case in Fig. 2
  • Fig. 3 shows a picture tube comprising a sereen such as shows in Fig. 1 er Fig. 2, some control mens ofthe tube being shown diagrarnrnatically. 1
  • Fig. 4 is a secticnal view at the area of the dotted line iV IV in Fig. 3, Fig. 5 showing diagrammatically a circuit of a deflection coil and the supply circuits used therewith.
  • the part of the sereen 1 shown in Fig. 1 is constituted by groups of three strips 2, 3, 4 and5, 6,-7, which are cyclcally repeated and which reproducethe fundarnental colours, for exarnple red (r) green (g) and blue"(b).
  • Reference numeral 8 indicates one ob tainable cross Maximum anastigmatism of the cath- SGITICS Pareii section of the cathode-ray beam where it strikes the sereen, the main dimension of which lies in the direction of length of the blue strip 4. The smallest dimension of the cross-section of the beam is at the most equal to the width of the strip.
  • the beam is rnoved tbrough a distance equal to the width of one strip in the vertical direction, for exa-mple upwards, the cross-section of the beam lies on agreen strip and a visibie green signal is reproduced upon horizontal deflection.
  • the picture tube is thus suitabie for reproducng a colour television image, it being mentioned for the sake of compieteness that the resolving power in the horizontal direction is smaller than with the coitatiional scanning method, in which the dimension of the cross-section of the beam in the horizontal direction is substantially equai to that in the vertical direction.
  • the beam is astigrnatic, it is possible by varying the focai length of the electron-optical system of the tube to obtain also an orientation of the cross-section of the beam at the area of the sereen by which the largest dimension of the cross-section is directed verticaily, as indicated at 9.
  • the beam strikes the strips 3 (g), 4 (b) and 5 simultaneously, so that a blackwhite signal is now reproduced by the tube.
  • Fig. 2 shows three forms 10, 11, 12 of the cross-section of the beam in which the center of the beam is centered on the green strip 1.3, and furthermore three forms 14, 15, 16, in which the center of the beam is centered on the blue strip 17.
  • the focal length of the electron-optical system is graduaiiy vared until the position 12 is reached, a plurality of intermediate forms of the cross-section of the beam oceur at the area of the sereen, one of which is indicated at 11.
  • the spot 14 will produce a slight predominance of -blue eolor, and the spot en the neirt line Will produce a slight ipredominance of red eolor.
  • These slight deviatio'ns -from pure white are seatcely notieeable, due to the wide color toleranee of the human eye.
  • the efiect of pure white is produced, how'ever, iiue te integration by the eye of the slightly predomiatirig eolors of grieen, blue and red during -successive scnnings of the eolor strips.
  • a cathode-ray tube 18 comprises a sereen 19 having Strips of the kind shown in Fig. 1 or Fig. 2.
  • the tube comprises a cathode 20, a Wehnelt-electrde 21 and a first anode 22, by whieh a cathode-ray beam is generated in kn0Wn manner with the use of suitable biassing potentials.
  • the beam is focussed with the use of a focussing coil 23 of known eonstruction.
  • a coil 24 fed with suitable direct-current is provided behind the focussing coil 23.
  • a cross-section of coil 24 taken 'along the dotted line IVIV is shown in Fig. 4, reference numeral 25 indicating the wall of the tube 18 at the area IVIV.
  • the coil 24 has a shape which is fiattened and, as the case may be, for example elliptie.
  • the cathode-ray beam thus aequires the required astigmatism, and the cross-seeti0n shape of the beam al'ong a portion of the length thereof in the vicinity of the sereen varics from an-oval shape with the longest diameter perpendieular te the sereen strips, to an oval shape with the longest diameter parallel to the sereen strips.
  • the astigmatism of the cathode-ray beam may alternatively be ensured in a different way, as is Well-knownin the aim at avoiding this phenomenon whieh, as a rule, is undesirable.
  • the deflection coil is in this case constituted by halves 26 and 27.
  • the deflection current is supplied between earth and a terminal 28 via a capacitor 29 te thehalves of the coil.
  • the latter are conneeted in series in opposite senses, the series-c0nnection inclucling -a battery 30.
  • a further method of obtaining astigmatism is to provide the eathode-ray tube with an eleetron-opticl system eomprising a cylindrical eleetrode of ellipticl section.
  • the mean voltage of a set of deflectionplates maybe dilerent from -the voltage of the seeondanode of this tube.
  • a third coil 31 is provided around the neck of the tube. This coil serves to defiect the cathode-ray beain in the vertical direction and in this case through a distanee 'equal at most to twiee the wdth of the strips.
  • the normal deflection of the beam in the horzontal and vertical directions is brought about in known manner.
  • the nformation about eolour need not necessarily be supplied to a par't icu lar defliztion coil 31, but may alternatively be superposed en the saW-tooth oscillation supplied to the ordinary vertical deflection means.
  • the brightness signal supplied tothe Wehnelt eleetrode 21 "determines the strength of the cathode-ray beam and hence the brightness ofsereen 19 of the tube.
  • the eorrecting means usually employed in the known circuits may also be uscd in the circuit according to the nvention. If it shuld appear, for example, that variation in the current streugthof the cathode-ray beam results in variation of thefocal length, whieh would also eause variation in the shape of "the c'ross-sectioh of the beam, a signal derived from the brightness sgnal may be suppiied as a correeting voltage to the focussing coil 23, so that the focussingis -not aiected by the brightness.
  • LA color telvsion display system eomprising a picture tube eon'taining-a Sereen composed of eyelically re peated parallelvantps of equal-width strips of materials whichprodueedifferent 'colors when struek by an electron beam,meansfr:prodbing an electren beam dreeted to ward said sereen, means for causing said beam to scan saidscreen in a direction.parallel to said strips and in a direction perpendicular to said strips, and means for selectively eausing variable astigmatism of said beam by such 'an amounttht at "said sereen the dimension of the eross-sectionpf the bearn in a direetion perpendieular to the length of said strips is selectively varied between the limits of substzntially the wdth of a group of said strips and the Widthof a single strip.
  • a system as elaimed in claim 2, in Whieh said beam-shaping means compn'ses a coil having an ovalshaped cross-sectibnandpositioned to surround said elee tron beam.
  • a system as clairnedin claim 2 in whieh saidmeans forca5ing said electronbeam to s'ean said sereen com prises a pair of magnetic deflection coils arranged to pro prise a magnetie defleetion field perpendcular to said beam, and in which said beam-shaping means comprises mearis 'for apply'ing -clireet current to the coils of said pairin- Gppoite serise.
  • peated parallel groups of equal-width strips of materials which produee different colors when struck by an electron beam means for producing an electron beam drected toward said sereen, means for causng said beam to scan said sereen in a direction parallel to said strips and in a direction perpendcular to said strips, means for eausng said eleetr0n beam to have ellptieal astigmatsm whereby the cross-section of said bearn along a porion of the length thereof in the vcinity of said sereen varies from an oval shape with the longest diameter perpendieular to said sereen strips, to an oval shape with the longest diameter parallel to said sereen strips, said longest diameter being substantially equal to the total width of a group of said sereen strips, means adapted to control the fucus of said electron beam in response to eolor saturation signals, means adapted t0 control the intensity of said electron beam in response to brghtness signals, and means f0r selectvely deflecting said electron beam

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
US346083A 1952-04-10 1953-04-01 Circuit for television picture tubes Expired - Lifetime US2784342A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL310372X 1952-04-10

Publications (1)

Publication Number Publication Date
US2784342A true US2784342A (en) 1957-03-05

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Family Applications (1)

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US346083A Expired - Lifetime US2784342A (en) 1952-04-10 1953-04-01 Circuit for television picture tubes

Country Status (7)

Country Link
US (1) US2784342A (fr)
BE (1) BE519060A (fr)
CH (1) CH310372A (fr)
DE (1) DE942747C (fr)
FR (1) FR1076406A (fr)
GB (1) GB729685A (fr)
NL (1) NL168782B (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2905855A (en) * 1957-06-24 1959-09-22 Westinghouse Electric Corp Image display system
US2921211A (en) * 1955-02-23 1960-01-12 Westinghouse Electric Corp Image reproduction device
US2922073A (en) * 1955-03-22 1960-01-19 Kendon Electronics Inc Color reproduction systems of the cathode ray tube type
US3032608A (en) * 1956-11-15 1962-05-01 Gen Electric Color tube potential switching between color and monochrome reproduction
US3096395A (en) * 1956-07-19 1963-07-02 Emi Ltd Velocity-modulated colour television receivers
US3230415A (en) * 1961-08-23 1966-01-18 Telefunken Patent Electromagnetic focussing device for cathode ray tubes
US3277235A (en) * 1959-03-20 1966-10-04 David M Goodman Wide band and color cathode ray tubes and systems
US3280250A (en) * 1962-06-01 1966-10-18 Scope Inc Color television receiver including means for scanning the same horizontal lines during consecutive fields
US3437870A (en) * 1965-11-03 1969-04-08 Minnesota Mining & Mfg Scan line masking system
US3470414A (en) * 1968-05-27 1969-09-30 Westinghouse Electric Corp Direct view storage system
US3678195A (en) * 1971-06-18 1972-07-18 Fernseh Gmbh Smearing effect attenuation
US3949166A (en) * 1973-11-12 1976-04-06 Sony Corporation System for use in television receivers for providing improved sharpness of images

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH360416A (de) * 1958-02-25 1962-02-28 Gretag Ag Fernsehwiedergabeverfahren und Anordnung zu seiner Durchführung
DE3005946A1 (de) * 1980-02-16 1981-08-27 Standard Elektrik Lorenz Ag, 7000 Stuttgart Farbbildroehre ohne schattenmaske und mit nur einer elektronenkanone
US4678969A (en) * 1983-06-22 1987-07-07 Raytheon Company Pseudo-raster weather display apparatus

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137353A (en) * 1934-03-03 1938-11-22 Loewe Opta Gmbh Television tube
US2212640A (en) * 1934-07-07 1940-08-27 Radio Inventions Inc Cathode ray system
US2278478A (en) * 1941-01-10 1942-04-07 Bell Telephone Labor Inc Magnetic coil and arrangement utilizing the same
US2304163A (en) * 1940-11-23 1942-12-08 Rca Corp Modulation system
US2310863A (en) * 1941-01-25 1943-02-09 Rca Corp Luminescent screen
US2431115A (en) * 1944-08-05 1947-11-18 Alfred N Goldsmith Color television system
US2481839A (en) * 1944-08-05 1949-09-13 Rca Corp Color television

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2137353A (en) * 1934-03-03 1938-11-22 Loewe Opta Gmbh Television tube
US2212640A (en) * 1934-07-07 1940-08-27 Radio Inventions Inc Cathode ray system
US2304163A (en) * 1940-11-23 1942-12-08 Rca Corp Modulation system
US2278478A (en) * 1941-01-10 1942-04-07 Bell Telephone Labor Inc Magnetic coil and arrangement utilizing the same
US2310863A (en) * 1941-01-25 1943-02-09 Rca Corp Luminescent screen
US2431115A (en) * 1944-08-05 1947-11-18 Alfred N Goldsmith Color television system
US2481839A (en) * 1944-08-05 1949-09-13 Rca Corp Color television

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2921211A (en) * 1955-02-23 1960-01-12 Westinghouse Electric Corp Image reproduction device
US2922073A (en) * 1955-03-22 1960-01-19 Kendon Electronics Inc Color reproduction systems of the cathode ray tube type
US3096395A (en) * 1956-07-19 1963-07-02 Emi Ltd Velocity-modulated colour television receivers
US3032608A (en) * 1956-11-15 1962-05-01 Gen Electric Color tube potential switching between color and monochrome reproduction
US2905855A (en) * 1957-06-24 1959-09-22 Westinghouse Electric Corp Image display system
US3277235A (en) * 1959-03-20 1966-10-04 David M Goodman Wide band and color cathode ray tubes and systems
US3230415A (en) * 1961-08-23 1966-01-18 Telefunken Patent Electromagnetic focussing device for cathode ray tubes
US3280250A (en) * 1962-06-01 1966-10-18 Scope Inc Color television receiver including means for scanning the same horizontal lines during consecutive fields
US3437870A (en) * 1965-11-03 1969-04-08 Minnesota Mining & Mfg Scan line masking system
US3470414A (en) * 1968-05-27 1969-09-30 Westinghouse Electric Corp Direct view storage system
US3678195A (en) * 1971-06-18 1972-07-18 Fernseh Gmbh Smearing effect attenuation
US3949166A (en) * 1973-11-12 1976-04-06 Sony Corporation System for use in television receivers for providing improved sharpness of images

Also Published As

Publication number Publication date
CH310372A (de) 1955-10-15
DE942747C (de) 1956-05-09
BE519060A (fr)
GB729685A (en) 1955-05-11
NL168782B (nl)
FR1076406A (fr) 1954-10-26

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