US2611100A - Temperature-compensated target assembly for color-kinescopes, etc. - Google Patents

Temperature-compensated target assembly for color-kinescopes, etc. Download PDF

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US2611100A
US2611100A US199252A US19925250A US2611100A US 2611100 A US2611100 A US 2611100A US 199252 A US199252 A US 199252A US 19925250 A US19925250 A US 19925250A US 2611100 A US2611100 A US 2611100A
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plate
color
frame
glass
screen
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US199252A
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Richard D Faulkner
William A Bentley
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RCA Corp
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RCA Corp
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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
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/06—Screens for shielding; Masks interposed in the electron stream
    • H01J29/07—Shadow masks for colour television tubes
    • H01J29/073—Mounting arrangements associated with shadow masks

Definitions

  • Masked-target kinescopes are described in-the RCA publication (April 1950) entitled: (General Description of Receivers for the RCA Color Ieler vision Employing the. RCA; DirecteView .Tri- Color Kinescope.
  • The, bieparttareet -assemblies i eseribed include: ..(.i).;A" viewing screen comprising 'a' transpa ent "foundation. surface containing'a multip 'citypaoi groups; of picture areas f -elemen al.
  • the difierent areas, of, each; group are: coated with different phosphor materialsh
  • the phosphor-covered areas usually takeztlle. for-m of circular or hexagonal-.d9t$,'rthough; as. deseribed in French en. 8 t me risen; theymav c mpr s a mu p t pa a el arran ed-phosphor lines.
  • the; biepart target assembly .fi ipliises ⁇ ii an pertured mask.
  • the mask is mountednear -the phosphor covered-face of the v-iewingscreen. 'rheniimber 0f p fi i the ask i -Jless than: the number of phosphor covered areas on thesfireen. If a three-color screen is employed, the mask usually contains one-third a smany a ertures asnthere are p os o eas th tarseti The mask is scanned by one or more-electronz-beams;
  • the electron-guns areindividual'tothe separate color-components of the phosphor .cov. ered areas of thetarget. ⁇ Ihe -beamsapproach thema sk at difierent angles; At ,themask, the
  • the beam-paths cross and diverge toimpinge uponseparate ones of the sub-elemental areasineach phosphor group If the kinescope is oi-wthe' onegun variety, the beam is deviated and rotated" to points corresponding-11013116 points of origin of the three-gun beama so that itto iapproaches lmask. and target atansles i d is uai v tothe different colors.
  • Color-kinescopes using a-B" ;x i3 receiving sc containing --ai pr xiina ely 300,000 colorphosphor dots have been successfullyiconstructed and operated.
  • the masksfor these screens comprise taut thin-metal sheetsicqntainin approximately. 200,000 apertures,-
  • Fig. 1 is a front elevational view showing the obverse or viewing side of the glass screen of a masked-target kinescope, the glass being supported, in accordance with the principle of the invention on cushions" in a pair of oppositely located clamping elements;
  • Fig. 2 is a rear elevation of the masked-target assembly of Fig. 1, showing the manner in which the punctiform mask is affixed to the frame or support of the assembly;
  • Fig. 3 is a vertical section of the masked-target assembly of Figs. 1 and 2, taken on the line 3-3 of Fig. 1.
  • the temperature-compensated target-assembly shown in the drawing comprises a translucent viewing-screen I, an apertured thin-metal mask 3, and a metal frame 5, upon which said screen and mask are supported.
  • the viewing screen comprises a foundation plate constituted of glass or equivalent (i. e. transparent or translucent) insulating material and its rear or target surface It will be understood to be provided with a punctiform or other pattern of electron sensitive areas, not shown.
  • This plate I as here shown, is in the form of a truncated circle, having upper and lower horizontally extending edges Ia and lb, respectively.
  • the mask 3 for the target surface It of the glass screen or plate I and the central opening 5 in the frame 5 are of the same general shape asthe viewing screen I.
  • the thickness dimension of the frame 5 is indicated by the required spacing between the mask 3 and the electron sensitive surface of the screen. 7
  • the thin metal mask 3 is secured to the rear surface of the frame 5 by means of screws 1 which extend through metal clamping strips 8, 8a, etc., which are disposed in end-to-end relation, about the marginal edges of the mask. Wires 9, welded to the underside of each strip, may be provided, if desired, toprevent the mask from slipping when the screws are tightened.
  • the thin metal mask is. preferably heated before the screws are tightened,.so that, upon cooling, the thin metal will contract and be rendered taut on the frame.
  • the different coefilcients of expansion of the glass and metal might cause the glass to crack when the assembly is subjected to the heat generated either during'normal operating periods (by the electron-beam) or during the sealing-in (or dc-gassing) manufacturing operations.
  • this hazard is overcome by applying the clamping force to the glass plate I through a suitable cushioning material II, which permits of a limited degree of relative movement between the glass plate or screen I and the frame 5 when the assembly is subjected to changes in temperature.
  • the cushion I1 must be constituted of a refractory material and, furthermore.
  • the material must be of a kind capable of being thoroughly out-gassed without unduly prolonging the time the tube is on the pump. Fibers constituted of glass and assembled either in the form of a bundle, wad or fabric have been found entirely satisfactory.
  • the refractory cushioning ma terial takes the form of a woven glass tape I1 and is disposed between the marginal straight edges of the major surface I5 of the viewing screen I and the long arms of the L-shape clamping members II and I3.
  • the present invention provides an improved temperature-compensated screen assembly and one which is substantially immune to shocks and tremors of any ordinary intensity.
  • a temperature-compensated target and frame assembly for use in an electron-discharge device, said assembly comprising, a foundation plate having an electron-sensitive target surface, a frame for said plate, said plate and said frame being constituted of materials having different coeificients of expansion, mounting elements carried by said frame in a position to engage'discrete edge portions of said plate, a resilient refractory material disposed adjacent to said discrete edge portions of said plate, and
  • said resilient refractory material is in the form of a fabric having a relatively loose weave to facilitate the removal of gas therefrom.
  • said resilient refractory material comprises a tape-like structure constituted of glass fibers.
  • mounting elements for said foundation plate comprise a pair' of elongated L- shape members disposed with their long arms adjacent to a'common major surface of said plateand their short arms adjacent to oppositel-y located minor surface portions of said plate.
  • -A temperature-compensated target assembly'for use in 'a cathoderay tube said assembly comprising a translucent foundation plate having an electron-sensitive target surface, a frame for supporting said foundation plate and containing a central aperture through which electrons may pass to said target surface, adjustable mounting elements carried by said frame in a position to engage discrete edge portions of said plate, a resilient refractory material disposed adjacent to said discrete edge portions of said plate and through which a clamping force is applied to said plate by said clamping elements, and an apertured electrode secured to said frame in spaced relation with respect to said electron-sensitive target surface of said translucent foundation plate.

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  • Electrodes For Cathode-Ray Tubes (AREA)

Description

P 1952 R. D. FAULKNER ET AL 2,611,100
TEMPERATURE-COMPENSATED TARGET ASSEMBLY FOR COLOR-KINESCOPES, ETC
Filed Dec. 5, 1950 NVENTOR 9 e/cwmea a 5904411!!! 4/10 Mum/w A! B'A/HE Patented Sept. 16 a 1952 1 315??? FQ O R-3 5 1 3 na -am Faulkner and William A. Bentley,
a cas er). B
at America;
a i s. o, Rad o. fiorpeiefiqn corporation ielavgare Application December 5, 1950,: Serial No. 199,252 i i l V 7 Qlaimsi (C 313 9 This invention relatesto cathode-ray:'-.tuhes and particularly to improvements intarget assemblies for color-kinescopes.of'rthe .so=ca1led m asked-target variety;
Masked-target kinescopes are described in-the RCA publication (April 1950) entitled: (General Description of Receivers for the RCA Color Ieler vision Employing the. RCA; DirecteView .Tri- Color Kinescope. The, bieparttareet -assemblies i eseribed include: ..(.i).;A" viewing screen comprising 'a' transpa ent "foundation. surface containing'a multip 'citypaoi groups; of picture areas f -elemen al. ima e dimensions- The difierent areas, of, each; group are: coated with different phosphor materialsh Each phosphor material, when struck bye ctronssemitslight of a color peculiar to its posit n in. .tl ie roup.v The phosphor-covered areas usually takeztlle. for-m of circular or hexagonal-.d9t$,'rthough; as. deseribed in French en. 8 t me risen; theymav c mpr s a mu p t pa a el arran ed-phosphor lines. The second-elem 9f. the; biepart target assembly, .fi ipliises {ii an pertured mask. The mask is mountednear -the phosphor covered-face of the v-iewingscreen. 'rheniimber 0f p fi i the ask i -Jless than: the number of phosphor covered areas on thesfireen. If a three-color screen is employed, the mask usually contains one-third a smany a ertures asnthere are p os o eas th tarseti The mask is scanned by one or more-electronz-beams;
When the color-kinescope is of the three-gun variety, the electron-guns areindividual'tothe separate color-components of the phosphor .cov. ered areas of thetarget. {Ihe -beamsapproach thema sk at difierent angles; At ,themask, the
beam-paths cross and diverge toimpinge uponseparate ones of the sub-elemental areasineach phosphor group If the kinescope is oi-wthe' onegun variety, the beam is deviated and rotated" to points corresponding-11013116 points of origin of the three-gun beama so that itto iapproaches lmask. and target atansles i d is uai v tothe different colors.
Color-kinescopes using a-B" ;x i3 receiving sc containing --ai pr xiina ely 300,000 colorphosphor dots have been successfullyiconstructed and operated. The masksfor these screens comprise taut thin-metal sheetsicqntainin approximately. 200,000 apertures,-
Certain methods em lo ed in plotting-the rela-v tive location of thegrouped phosphor dots p ct o the m sk .holes..and. 1i=n -makingrfand mounting the screen and maskrassembly', are described and claimed by Harold B. Law in coa be substantially A sendin annlieatien Ser al: N95 1583 fi ed April 28495 .I assemb y; t eh n -meta mask; is st etched-filer the iap ie ticn 9i ea en; ametal a i aiiizieektherete. in inite cooling) by. .meansei screw-ever. theeliise Ehi ass-screen i ecuredte. the apposite. s de Qi the ran eswithiitsphesnhorcoyered surfa eitn Semen a n he mask. .b -twc ninsorbelt Law'reeosnized that the, diiierent eoefiiei nt of expansion of the glass. screen andthe metal mask and irtime-could. causedamage to the a sembly when. it 315 subiecteduto heat duringathe Me -as,- sing cycle and during. normal operatingcycles. In: order to minimize. this: hazardLaw provides his frame with one or. more oversize holes or slots for receivingthe 4 pins 1 ort-bolts which hold the glass; SGIGBIh-Olltthfi, metal; plate. Thus,. the
stresses which might. b.e.-:1'applied to. the glass installation of the tube Withinwhich it'is in-' stalled. Nor is the-solution oi tli'is' problem found in theuse of moremounting-screws, since each 7 additional screw requires-the -boring of an additional hole in 'the screen and its supporting frame.- 1 Accordingly -the principal pbject of the pres: ent invention is to provide animproved 'ten e perature-compensated; screen-assembly of f the general character described and on which shall n n s rl' i e s t r Another and related objectdill? :9 i s..ma eriali .y ei dee w thei t niii -e the t me tha h tubei a the um The qrescine. and at, in accordance with the inve k facile manner by the provis on lo f a, aii ofop r pes e r t c m s which a e ,see re o th mask-supporting ram nd Wit whichi he glass screen isi-supported to perm o degree of movement on cushions constituted of aspuhlglass or equivalent (i; e. easily as-gasses)" resilient material;
3 connection with the accompanying single sheet of drawings, wherein:
Fig. 1 is a front elevational view showing the obverse or viewing side of the glass screen of a masked-target kinescope, the glass being supported, in accordance with the principle of the invention on cushions" in a pair of oppositely located clamping elements;
Fig. 2 is a rear elevation of the masked-target assembly of Fig. 1, showing the manner in which the punctiform mask is affixed to the frame or support of the assembly; and
Fig. 3 is a vertical section of the masked-target assembly of Figs. 1 and 2, taken on the line 3-3 of Fig. 1.
The temperature-compensated target-assembly shown in the drawing comprises a translucent viewing-screen I, an apertured thin-metal mask 3, and a metal frame 5, upon which said screen and mask are supported. The viewing screen comprises a foundation plate constituted of glass or equivalent (i. e. transparent or translucent) insulating material and its rear or target surface It will be understood to be provided with a punctiform or other pattern of electron sensitive areas, not shown. This plate I, as here shown, is in the form of a truncated circle, having upper and lower horizontally extending edges Ia and lb, respectively. The mask 3 for the target surface It of the glass screen or plate I and the central opening 5 in the frame 5 are of the same general shape asthe viewing screen I. The thickness dimension of the frame 5 is indicated by the required spacing between the mask 3 and the electron sensitive surface of the screen. 7
The thin metal mask 3 is secured to the rear surface of the frame 5 by means of screws 1 which extend through metal clamping strips 8, 8a, etc., which are disposed in end-to-end relation, about the marginal edges of the mask. Wires 9, welded to the underside of each strip, may be provided, if desired, toprevent the mask from slipping when the screws are tightened. As described in the Law application (Serial No. 158,901), the thin metal mask is. preferably heated before the screws are tightened,.so that, upon cooling, the thin metal will contract and be rendered taut on the frame.
Two elongated L-shape, clamping elements II and I3, which are movably secured to the front of the frame 5 by two sets of screws I2, and I 4, respectively, hold the viewing screen or," plate I in position on the frame 5. This glass plate I is fitted in the angle of the Us (I I, I3) with the long arm of each L (I I, I 3), extending over the straight edges of the front major surface of the glass, so that the short armsof the Us (I I, I3) are adjacent to the straight minor edges thereof.
If a clamping force were to be applied directly to the glass through the clamping elements II, I
I3 and screws I2 and I4, the different coefilcients of expansion of the glass and metal might cause the glass to crack when the assembly is subjected to the heat generated either during'normal operating periods (by the electron-beam) or during the sealing-in (or dc-gassing) manufacturing operations. In accordance with the present invention, this hazard is overcome by applying the clamping force to the glass plate I through a suitable cushioning material II, which permits of a limited degree of relative movement between the glass plate or screen I and the frame 5 when the assembly is subjected to changes in temperature. The cushion I1 must be constituted of a refractory material and, furthermore. the material must be of a kind capable of being thoroughly out-gassed without unduly prolonging the time the tube is on the pump. Fibers constituted of glass and assembled either in the form of a bundle, wad or fabric have been found entirely satisfactory. In the instant case, the refractory cushioning ma terial takes the form of a woven glass tape I1 and is disposed between the marginal straight edges of the major surface I5 of the viewing screen I and the long arms of the L-shape clamping members II and I3.
It will be observed that the construction and arrangement of the clamping elements II, I3 and screws I2, I4 is such that the glass plate is not weakened by the mounting holes required in the target assemblies of the prior art.
It will now be apparent that the present invention provides an improved temperature-compensated screen assembly and one which is substantially immune to shocks and tremors of any ordinary intensity.
What is claimed is:
1. A temperature-compensated target and frame assembly for use in an electron-discharge device, said assembly comprising, a foundation plate having an electron-sensitive target surface, a frame for said plate, said plate and said frame being constituted of materials having different coeificients of expansion, mounting elements carried by said frame in a position to engage'discrete edge portions of said plate, a resilient refractory material disposed adjacent to said discrete edge portions of said plate, and
means for exerting clamping force upon said plate through said mounting elements and resilient material, whereby to permit of a limited degree of relative movement between said frame and plate when said assembly is subjected to changes in temperature.
2. The invention as set forth in claim 1 and wherein said reslient refractory material is constituted essentially of inorganic fibers.
3. The invention as set forth in claim 1 and wherein said resilient refractory material is in the form of a fabric having a relatively loose weave to facilitate the removal of gas therefrom. I .4. The invention as set forth in claim 1 and wherein said resilient refractory material comprises a tape-like structure constituted of glass fibers.
5. The invention as set forth in claim 1 and wherein-said mounting elements for said foundation plate comprise a pair' of elongated L- shape members disposed with their long arms adjacent to a'common major surface of said plateand their short arms adjacent to oppositel-y located minor surface portions of said plate. v
6. The invention as set forth in claim 5 and wherein. said elongated L-shape mounting elements for said foundation plate are supported upon said frame by said means for exerting said clamping force upon said plate.
'7. -A temperature-compensated target assembly'for use in 'a cathoderay tube, said assembly comprising a translucent foundation plate having an electron-sensitive target surface, a frame for supporting said foundation plate and containing a central aperture through which electrons may pass to said target surface, adjustable mounting elements carried by said frame in a position to engage discrete edge portions of said plate, a resilient refractory material disposed adjacent to said discrete edge portions of said plate and through which a clamping force is applied to said plate by said clamping elements, and an apertured electrode secured to said frame in spaced relation with respect to said electron-sensitive target surface of said translucent foundation plate.
RICHARD D. FAULKNER. WILLIAM A. BENTLEY.
6 REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date Rose June 14, 1949 Law Jan. 3, 1950 Jensen Jan. 23, 1951 Larson Jan. 30, 1951 Levy Mar. 27, 1951 Rose Aug. 7, 1951
US199252A 1950-12-05 1950-12-05 Temperature-compensated target assembly for color-kinescopes, etc. Expired - Lifetime US2611100A (en)

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2669672A (en) * 1953-03-10 1954-02-16 Sam H Kaplan Color image target structure
US2701847A (en) * 1951-10-02 1955-02-08 Machlett Lab Inc Color television tube structure
US2736832A (en) * 1953-05-22 1956-02-28 Chromatic Television Lab Inc Hoop electrode structure
US2738436A (en) * 1952-09-02 1956-03-13 Chromatic Television Lab Inc Electrode structure
US2777084A (en) * 1952-04-12 1957-01-08 Gen Electric Plastic electrode structure for electron tubes
US2777088A (en) * 1952-02-05 1957-01-08 Gen Electric Tri-color cathode ray image reproducing tube
US2781469A (en) * 1952-11-04 1957-02-12 Hartford Nat Bank & Trust Co Cathode-ray tube, more particularly for colour television
US2795718A (en) * 1954-08-18 1957-06-11 Rca Corp Color kinescopes
US2806162A (en) * 1954-08-18 1957-09-10 Rca Corp Cathode-ray tube
US2822493A (en) * 1953-04-24 1958-02-04 Maurice D Harsh Graphechon storage tube
US2824989A (en) * 1954-12-21 1958-02-25 Columbia Broadcasting Syst Inc Color tube mask positioner
US2832911A (en) * 1954-05-27 1958-04-29 Gen Electric Thermal compensating grid frame
US2936399A (en) * 1954-07-12 1960-05-10 Chromatic Television Lab Inc Color structure for cathode-ray tubes designed for polychrome image reproduction
US2951179A (en) * 1956-05-28 1960-08-30 Gen Electric Electron shield for post acceleration cathode ray tube
US3013178A (en) * 1953-03-23 1961-12-12 Fairchild Camera Instr Co Focussing mask for cathode ray tube
EP0121023A1 (en) * 1983-03-03 1984-10-10 Tektronix, Inc. Improved CRT shadow mask assembly
EP0121628A1 (en) * 1983-03-03 1984-10-17 Tektronix, Inc. Cathode-ray tube having taut shadow mask
US4766342A (en) * 1986-12-17 1988-08-23 Zenith Electronics Corporation Tension mask assembly for a color CRT
US4994712A (en) * 1989-05-03 1991-02-19 Zenith Electronics Corporation Foil shadow mask mounting with low thermal expansion coefficient

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473220A (en) * 1941-08-16 1949-06-14 Rca Corp Method of manufacturing target electrodes
US2493539A (en) * 1946-06-13 1950-01-03 Rca Corp Target for pickup tubes
US2538836A (en) * 1948-10-15 1951-01-23 Rca Corp Barrier grid storage tube
US2539442A (en) * 1946-07-01 1951-01-30 Farnsworth Res Corp Process of preparing a double-sided mosaic electrode
US2546828A (en) * 1950-02-17 1951-03-27 Nat Union Radio Corp Target assembly for cathode-ray tubes
US2563488A (en) * 1951-08-07 Barrier grid storage tube

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2563488A (en) * 1951-08-07 Barrier grid storage tube
US2473220A (en) * 1941-08-16 1949-06-14 Rca Corp Method of manufacturing target electrodes
US2493539A (en) * 1946-06-13 1950-01-03 Rca Corp Target for pickup tubes
US2539442A (en) * 1946-07-01 1951-01-30 Farnsworth Res Corp Process of preparing a double-sided mosaic electrode
US2538836A (en) * 1948-10-15 1951-01-23 Rca Corp Barrier grid storage tube
US2546828A (en) * 1950-02-17 1951-03-27 Nat Union Radio Corp Target assembly for cathode-ray tubes

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2701847A (en) * 1951-10-02 1955-02-08 Machlett Lab Inc Color television tube structure
US2777088A (en) * 1952-02-05 1957-01-08 Gen Electric Tri-color cathode ray image reproducing tube
US2777084A (en) * 1952-04-12 1957-01-08 Gen Electric Plastic electrode structure for electron tubes
US2738436A (en) * 1952-09-02 1956-03-13 Chromatic Television Lab Inc Electrode structure
US2781469A (en) * 1952-11-04 1957-02-12 Hartford Nat Bank & Trust Co Cathode-ray tube, more particularly for colour television
US2669672A (en) * 1953-03-10 1954-02-16 Sam H Kaplan Color image target structure
US3013178A (en) * 1953-03-23 1961-12-12 Fairchild Camera Instr Co Focussing mask for cathode ray tube
US2822493A (en) * 1953-04-24 1958-02-04 Maurice D Harsh Graphechon storage tube
US2736832A (en) * 1953-05-22 1956-02-28 Chromatic Television Lab Inc Hoop electrode structure
US2832911A (en) * 1954-05-27 1958-04-29 Gen Electric Thermal compensating grid frame
US2936399A (en) * 1954-07-12 1960-05-10 Chromatic Television Lab Inc Color structure for cathode-ray tubes designed for polychrome image reproduction
US2795718A (en) * 1954-08-18 1957-06-11 Rca Corp Color kinescopes
US2806162A (en) * 1954-08-18 1957-09-10 Rca Corp Cathode-ray tube
US2824989A (en) * 1954-12-21 1958-02-25 Columbia Broadcasting Syst Inc Color tube mask positioner
US2951179A (en) * 1956-05-28 1960-08-30 Gen Electric Electron shield for post acceleration cathode ray tube
EP0121023A1 (en) * 1983-03-03 1984-10-10 Tektronix, Inc. Improved CRT shadow mask assembly
EP0121628A1 (en) * 1983-03-03 1984-10-17 Tektronix, Inc. Cathode-ray tube having taut shadow mask
US4547695A (en) * 1983-03-03 1985-10-15 Tektronix, Inc. CRT Shadow mask assembly
US4766342A (en) * 1986-12-17 1988-08-23 Zenith Electronics Corporation Tension mask assembly for a color CRT
US4994712A (en) * 1989-05-03 1991-02-19 Zenith Electronics Corporation Foil shadow mask mounting with low thermal expansion coefficient

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