US2807737A - Cathode ray television receiver tube and method of using the same - Google Patents

Description

Sem 4, w57 A. WRIGHT 29H37 CATHODE RAY TELEVISION RECEIVER TUBE AND METHOD OF' USING THE SAME Filed Jan. 13, 1955 INVENTOR aired States Patent Office l'2,807,737 Patented Sept. 24, 1957 CATH-IODE RAY TELEVISION RECEIVER TUBE AND METHD F USING TIE SAME Arthur Wright, Forest Hills, `N. Y.; Annie Wright, administratrix of said Arthur Wright, deceased Application January 13, 1955, Serial No. 481,661 6 Claims. (Cl. 313-711) My invention relates particularly to a television apparatus and receiver tube of an improved type and method, whereby many disadvantages previously encountered may be avoided in the present day color television.

An object of my invention is to provide an apparatus and method, or color-kinescope, for producing graphic figures and pictures in which many disadvantages of present day methodsare avoided by the receiving apparatus or cathode ray tubes herein provided. A further object is to obtain brighter images,without resorting to higher beam power to attain increased brilliancy. Another object is to avoid shadow masks which intercept the electron beam and prevent the use of a large percentage of the power of the beam and which also detract from the image sharpness. Still another object is to avoid the dliliculties encountered in the buckling of the very thin shadow masks hitherto found necessary. Still another object is to avoid the ditliculty of applying a succession of microscopic phosphor dots to the target area in several different colors. Still further objects will appear from the detailed description of my invention hereinafter.

My invention may be carried out with any desired number of electron guns, for instance by utilizing three electron guns and the other structural elements as set forth in the patent to Epstein No. 2,659,026, granted November l0, 1953, or, instead, one electron gun as in the patent to Jenny No. 2,611,099, granted September 16, 1952, but by omitting the shields and perforated screens as Well as the dotted phosphor construction in said patents, while, however, utilizing the angularity of the electron beams.

While my invention is capable of being carried out in many different ways, l have described and shown only one example by way of illustration thereof, in the accompanying drawings, in which* Fig. l is a horizontal section of a color-kinescope tube made in accordance with my invention; and

Fig. 2 is a diagrammatic horizontal detail section enlarged thereof.

By way of example, as shown in the drawings, I may provide anenvelope 1, provided with an appropriate amount of vacuum, made of glass or any other suitable material, having a front thickenedwall 2 through which the television image may be observed from an innerground glass surface 3. Theftube 1 is providedwith a neck 4 which contains threeelectron guns 5, 6 and 7, arranged for example 120 away from one another as related to the axis of a neck portion 4 of thetube 1. A set of magnetic yokes orcoils 8 and 9 is provided around the neck portion 4 of the tube. The yoke orcoil 8 is located near thecommon anode 10 of theelectron guns 5, `6, and 7, so as to convergeparallel beams 11, 12 and 13 therefrom which relate to the red, blue and green respectively, onto any givenpoint 14 of atarget surface 15 of any suitable phosphor, but preferably such as to provide White light. Theluminescent coating 15 is carried on the rear face of athin glass plate 16 having formed on the front face thereoflenticulations 17, which are preferably cylindrical, but may be in the form of spherical pivots, which have a focal point at the rear of theplate 16, and have a radius, approximately, of 1/3 of the plate thickness. The width of thelenticles 17 may be of any desired size, as for example from 4 to 30 per mm. larger or smaller, but preferably about 4, and which are located and have their dimensions such as to accord and register with the sequence of the respective three different-color impulses received by the electron beam in thetube 1. These, of course, will be synchronized in time, distance and direction with the colors registered by the camera tube scanning beams. However, the comV posite beam of thetube 1, as usual, is preferably directed substantially horizontally across thetarget surface 15, or at the conventional slight angle to the horizontal, whereas thelenticles 17, if cylindrical, are located at any desired angle to the track of the scanning beam but prefer ably in a vertical direction, although the cylindrical lenticles may be located at any other desired angle t-o the track of the scanning beam. The synchronized light image thus emitted by thephosphor 15 is transmitted to and through thelenticulations 17, each of the said images being divided into two, three or more portions corresponding to the two, three or more transmitted color components of the color filter of the camera tube. The respective light components thus formed thereupon pass at their respective angles, caused by the curvature of each lenticle, to an objective system 18, of any desired type, thence through amultizone color lilter 19, as set forth for instance in my Patent No.2,621,247, granted December 9, 1952, or in my copending application Ser. No. 440,671, filed July 1, 1954. The objective system 18, such as referred to therein, then focuses the images in their multicolor components onto the groundglass viewing surface 3. A conductive coating 20 is provided on the inside of the tube neck 4 having the same potential as theanode 10 which acts as an accelerating electrode. Theyoke 8 acts as a converging coil upon the electrons from the threeelectron guns 5, 6 and 7, which form threeconverging beams 21, 22 and 23, relating respectively to the colors red, blue and green, that converge at theluminescent surface 15, but have three different angularities according to the three color impulses, red, blue and green respectively. Theyoke 9 is comprised of a pair fof deflecting coils for producing the usual horizontal and vertical scanning action of the beams on thetarget area 15. The angularities of the three respective beams aid in the sharp separation between them and the transmission to the conformations of either smooth or rough phosphor coating 15 in the most effective directions, as they have separate relative inclinations, in the general directions of the three different inclinations: of the courses of light within each of the lenticles transmitted to the three respective parallel color zones of thecolor filter 19, through the objective 18. In other words, preferably, one of the repetitive time-division multiplexed beams, forexample beam 21, would be angularly inclined from the axis of the tube neck 4 substantially vertically along the axis of eachparticular lenticle 17, when the lenticles 1'7 are at right angles to the beam track, which is customarily slightly inclined to the horizontal, and thebeams 22 and 23 would be inclined angularly to the right and left, respectively, of the axis of each said lenticle, preceding a similar angular separation of the courses of the respective bundles of light rays transmitted from the rearfocal points 24, 25 and 26 of each lenticle, by reason of the curvature thereof, thence through the objective 18 and through the central red, left blue, and right green zones of thecolor filter 19, inasmuch as, as shown in Fig. 2, said three bundles of light rays, which are produced by theplate 17, cross one another within each of said lenticles.

It will be understood, Yof course, that any alternative forms of beam courses and scanning Systems may be utilized herein as referred to, forinstance, in the patent to Epstein aforesaidl." j v f While I have described my invention above in detail I wish it to' be understood that many changes Vmay be made therein without departing Vfrom' Vthe spirit of the same.A Y Y I claim: l oY i 1;'A Acathode ray tube comprising an envelope, an

, electron gundevifce therein, means to produce scanning beam impulses therefrom of varying angularity according to a succession of different-'color signals, a luminescent targetsurface therefor, arranged-to lreceive the entire impulses from said device, a'succes'sion of lenticles located in said envelope to receive the light from said surface, an'` objective land multizone color lter in said envelope Vto'rec'eive the light therefrom, and a viewing screen'in the focal point of said objective.

2. A cathode ray tube comprising anV envelope, an electron gun device therein, means to produce scanning beam impulses therefrom of varyingV angularity according to a succession of different-colorV signals, Va luminescent target surface therefor, arranged to receive the' en- .tire impulsesfrom said device, apsuccession of lenticles located'in said envelope to receiyethe light from said surface, an objective kand multizone color lter in said envelope to receive the light therefrom, and a viewing screen at said envelope in the focal point of said objective.

3. A cathode ray tube comprising an envelope, a lplu` rality of electron guns therein', means to produce a plu- Y Vrality of converging scanning beams therefrom of varying angularity according to a succession' of Vdifferentcolor signals, a luminescent target surface therefor, arranged to receive theentire beam from said gun, a succession of lenticles located in said envelope to receive the light from said surface, an objective and multizone color lter in said envelope Vto receive the light therefrom, and

Y a viewing screen in the focal point of said objective.

4. A cathode raytube comprising an envelope, a pluralityof electron guns therein, means to produce a plurality of converging scanning beams therefrom of varying said surface each 'of which is located so as to receive vall,

Y 4 angularity Yaccording toa succession of different-color signals, a luminescent target surface therefor, arranged to receive the entire beam from said gun, a succession of lenticles located in said envelope to receive the light from said surface, an objective and multizone color filter in said envelope to receive the light' therefrom, and a viewing screen at said envelope in the focal point of said objective. y Y Y 5. A cathode ray tube comprising an envelopeya plurality of electron guns Ytherein laterally displaced respectively means to produce a plurality of converging scanning beams therefrom of varying angular-ity according to a succession of different-color signals, a luminescent target surface therefor, a succession of cylindrical enticles located in said envelope to receive the light from said surface each of which is located so as to receive all said beams Ain different positions, respectively, behind the.

lenticle, anV objective and multizone color filter in said envelope to receive the light therefrom, anda viewing screen in the focal point of said objective.

6.-,A cathode ray tube comprising an envelope', a plu rality of electron guns therein laterally displaced respectively 120, means toproduce a plurality of converging scanning beams therefrom of varying angularity according to a succession of different-color signals, a luminescent target surfacertherefor, a succession of cylindrical lenticles located in said envelope to receive the light from said beams in different positions, respectively, behind the lcnticle, an objective and multizone color lter in said envelopeV to receive the light therefrom, andV a viewing Y i screen at'said envelope in the focal point of said'objective.

References Cited inthe le of this patent UNITED STATES PATENTS 2,479,820 2,663,821 Law v Dec. 22, 1953 2,683,834 wright V July 13, 1954 FOREIGN PATENTS 868,403

I Devel-6 Aug. 23, 1949 France Sept. 29, 1941

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