US2795718A - Color kinescopes - Google Patents

Color kinescopes Download PDF

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Publication number
US2795718A
US2795718A US450733A US45073354A US2795718A US 2795718 A US2795718 A US 2795718A US 450733 A US450733 A US 450733A US 45073354 A US45073354 A US 45073354A US 2795718 A US2795718 A US 2795718A
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US
United States
Prior art keywords
mask
metal
screen
hinge
rim
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
US450733A
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English (en)
Inventor
Frans Van Hekken
Morris R Weingarten
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.)
RCA Corp
Original Assignee
RCA Corp
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 to BE540599D priority Critical patent/BE540599A/xx
Application filed by RCA Corp filed Critical RCA Corp
Priority to US450733A priority patent/US2795718A/en
Priority to US450761A priority patent/US2795719A/en
Priority to GB23348/55A priority patent/GB811936A/en
Priority to FR1129827D priority patent/FR1129827A/fr
Priority to DER17289A priority patent/DE964064C/de
Application granted granted Critical
Publication of US2795718A publication Critical patent/US2795718A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/07—Shadow masks
    • H01J2229/0727—Aperture plate
    • H01J2229/0766—Details of skirt or border
    • H01J2229/0772—Apertures, cut-outs, depressions, or the like

Definitions

  • the accuracy with which the beamelectrons strike the individual screen-areas depends, in large measure, upon the accuracy with which the maskapertures are aligned with said screen-areas.
  • the beam-elec- Fig. 4 is an elevational View of one of the links or hinges of the temperature compensated mask;
  • Fig. 5 is a fragmentary View, partly in section, of the mask and its supports
  • Fig. 6 is a fragmentary View, partly in section, showing an alternative form of mask-supporting hinge r lever
  • Fig. 7 is a plan view and Fig. 8 an elevational view of l a mask having a hinged temperature-compensating border, .and
  • Figs. ⁇ 9 and 10 are fragmentary sectional views of other forms of hinged mask-boarders, within the invention.
  • Fig. 1 the invention is shown as applied to a 3-gun tri-color kinescope of the so-called masked-target dotscreen variety wherein the red (R) blue (B) and green (G) phosphor dots (see Fig. 2) are arranged in a hexagonal mosaic pattern on the rear or target surface 1 of a glass screen-plate 3.
  • This electron-sensitive color-screen may be of any desired shape e. g. circular or rectangular) and curvature (e. g. spherical, cylindrical or at). In the instant case it is in the form of a circular section of a spherical shell and comprises the front end or window of a metal envelope of more or less conventional form and dimensions.
  • the color screen may trons, or some of them, may impinge upon color-areas"- Y vention is to provide an improved method of and means for maintaining the apertures of a shadow-mask in alignment with the lelemental areas of a mosaic Vtype screen over a wide range of operating temperatures and this too without resort to the use of auxiliary mask-supporting carriages and bearings or costly (low expansion) materials for the mask and/or its supports.
  • a mask having a marginal edge portion or portions comprising a movable link, hinge orlever (frequently hereinafter referred to as a hinge) which, when actuated by the force of expansion (or contraction) of the mask material, moves the apertured scanned-area of the mask towards (or away from) the screen along lines which coincide, substantially, with the deflection angle of the beam, or beams, at each aperture.
  • hinge orlever frequently hereinafter referred to as a hinge
  • detlection angle as applied to a S-beam tube, is the angle subtended by a line drawn from any point on the screen, or its mask, along a median line of the beam-paths to the central axis of the tube.
  • the expansion or temperature compensating hinge may be integral with the mask, and this structure carried byaframe which in turn may be removably supported on fixtures or protuberances provided for the ptupose on the inner surface of the cap or other part of the envelope.
  • Fig. l is a longitudinal sectional view of a 3-gun tricolor kinescope of the shadow-mask dot-screen varietyr containing a temperature compensated mask constructed in accordance with the principle of the invention
  • Fig. 2 is a fragmentary rear-elevational view of the screen-unit of. the color-kinescope ofy Fig. 1, showing a conventional (hexagonal) pattern of mask-apertures and color-phosphor dots;
  • Fig. 3 ⁇ is a front elevational view of the mask of the screen-unit of Figs. 1 and 2, showing a six-point distribution of the mask-supports;
  • the mask 7 for the mosaic screen may be formed of any suitable material having a positive temperature coeicient of expansion.
  • it may comprise a thinmetal (e. g. iron, steel or copper) member, or it may be made of perforated glass which has been metallized or otherwise treated to render its surface conducting.
  • the mosaic screen pattern (RBG)l is laid down directly on the concave inner surface 1 v of the face plate 3, the mask 7 is appropriately curved so that it conform generally with said concave targetsurface.
  • mask are arranged in the same (e. g. hexagonal) systematic pattern-as ⁇ the phoshor triads RBG on the mosaic screenl, there being one mask-aperture for each triad.
  • Ags-is conventional, the red, blue and green electron-guns ⁇ 9r, 9b, 9 g are arranged delta-fashion about the central axisr'x-x lof the envelope, in the glass neck 11.
  • the three scanning beams pass through-the tubes plane-ofdeection A-A with their kcenters equally spaced from each other at a common distance-from the tube axis and converge adjacent. to the surface of the mask Where their paths cross and proceed to the respective color areas on the screen.
  • the plane-of-deflection is here defined as the plane in which the axis of each deflected beam, when extended rearwardly, intersects' ⁇ the axis of origin of that beam.
  • the plane-of-deflection crosses the central axis x-x of the tube at'or near the center of the deflection yoke 13, as indicated by' the lineA-A.
  • mask 7 is supported at a number (in this case, six) of places about its periphery by hinge elements 15 (see Fig. 4) which are secured, as by welding, at one end to theimask andat the opposite end to a rigid metal annulus or'frame 17.
  • the frame 17 and hence the mask 7 and its hinges 15 ⁇ are in turn supported upon metal pins 19 A which extend inwardly from the inner surface of the metal sidewalls 4of the cap 21 ⁇ of the tube and are seated in V-.grooves 23 in smallmetal blocks Z5 on the outer surface ofthe masks frame 17.
  • hinges 15 provided the requisite temperature-com- Peiftented June 1,1, 1 957A
  • the hinging action of these metal supports 15 was confined to the area of the bends 15d and 15e in the metal by vnarrow slits 15j, 15g, respectively, along each bend and by reinforcing'embossments 15h between said slits.
  • the surface or plane 15b of the link portion of the masksupporting hinge 15 forms an angle of 90 with respect to a line y-y drawn from ⁇ its upper bend 15a' t0 the mid-point of the tubes plane-of-dellection A-A. That is to say, when the mask is cold, the inclined surface 15b is normal to a line v-y extending therefrom to the centerof-dellection of the beam (or beams) at that point.
  • each apertured area in the mask moves toward the screen along a substantially straight path which coincides with a line drawn from the center of detiection to the phosphor triad associated with that particular aperture.
  • the alignment between the mask apertures 7a and the elemental areas (RB and G) on the target surface of the mosaic screen is maintained substantially irrespective of the operating temperature of the mask.
  • the invention is not Ilimited in its useful application to the particular form or kind of hinge in the mask is supported for slidable movement on one arm'27a and the force P (of expansion of the mask material) is applied to the other arm 2711, thefulcrum F being at the apex of the angle formed by the two arms.
  • thermo compensating hinges in the form of separate pieces and welding them in place they may be formed integral with the mask, as shown, by Way of example, in Figs. 7 to 10 inclusive.
  • the centrally located apertured targetportion of the mask which is here designated 39, is in the form of a rectangular (instead of circular) portion of a spherical shell and is provided with Van integral temperature compensating border or inner-rim portion 33 made up of a multiplicity of circumferentially spaced, rigid, link elements 35 which have inclined surfaces 37 connecting the apertured target area 39 of the mask with its upstanding mask-supporting outer-rim portion 41.
  • the inclined surfaces 37 of the link portions 35 of the mask-supporting hinge preferably form angles of 90 with respect to lines y-y drawn from their centers to the mid-point of the tubes plane-of-deection (A-A, Fig. l).
  • the hinging action is conned to the area of the flexible bends 43 and 45 in the metal at the opposite ends of each of the 'rigid link elements 35. 1
  • the hinges or links between the target area of the mask and its supporting rim are separated one from the others by intervening spaces. While this is desirable (because of the resulting saving in weight), it may add to the cost of the unit and, in any event, is not always essential to the practice of the invention.
  • the rigid elements of the hinge may comprise embossments 55 pressed in an imperforate border 57 surrounding the target areas of the mask, which is here designated 59.
  • the embossments 15h serve to reinforce the innerrim portion of the hinge and thus to confine its pivotal movements to the area of the exible bends (15d, 15e, Fig. 4;V 43, 45, Figs. 7-10) in the metal.
  • Reinforcement or stitfening of the inner-rim or body of the hinge may also be achieved by thickening the metal (e. g. by electroforrning) of which said part or parts are formed, or in other ways. For example by the use of discrete metal bars or ribs, not shown. Where stiifening ernbossments are employed, the embossrnents may assume various forms.
  • pivotal mask-supporting means of the present invention provides a simple yet effective means for maintaining the apertures of a shadow-mask in alignment with the elemental areas of a mosaic screen over a wide range of operating temperatures.
  • a cathode-ray tube comprising an evacuated envelope having a longitudinal axis and containing means for generating at least one electron-beam, a mask extending across said axis in a position to be scanned by said beam, said mask being constituted essentially of a material that expands when subjected to heat generated as an incident to the impact of beam-electrons thereon and containing a multiplicity of apertures through which beam-electrons pass along v substantially straight paths which form variousV deflection rangles with said longitudinal axis as determined by the instantaneous position of said beam during its scanning movements, a screen having an electron-sensitive mosaictarget-snrface spaced from said maskvwith the elemental areas of which said mosaic is comprised aligned with respect to the apertures in said mask, and pivotal means cooperatively associated with said mask for supporting said mask Within said envelope and for causing each apertured area of said mask to move along said straight paths in response to the expansion of said mask material when it is subjected to heat generated as an incident to
  • a mask comprising a substantially rigid marginal edge-portion for attachment to a support, a centrally located apertured target-portion constituted essentially of a temperature-sensitive material, and binge means responsive to expansion and contraction of said temperature-sensitive material ⁇ connecting said apertured targetportion to said marginal-edge portion.
  • hinge means comprises a substantially rigid link member iiexibly connected at its inner and outer extremities to said target and marginal-edge portions, respectively.
  • a mask comprising a centrally located apertured target-portion substantially in the form of a section of a spherical shell and constituted essentially of a material that expands when subjected to heat generated by electron-bombardment, an inner-rim portion connected to said spherical target portion by a exible bend in said material and inclined inwardly with respect to the concave surface of said spherical shell, and an outer-rim portion connected by a second tiexible bend in said material to the outer edge of said inner-rim, whereby said inner-rim comprises the connecting link and said first and second bends comprise the pivots of a hinge capable of translating the force of expansion of said spherical target portion into a movement in a direction away from its center-of-curvature.
  • said mask consists essentially of a single piece of thin metal and said inner-rim portion of said thin metal contains a plurality of spaced-apart strengthening embossments disposed between said tirst and second exible bends in the metal, whereby the pivotal movements of said hinge are conned substantially to said flexible bends.
  • a mask comprising a centrally located apertured target portion constituted essentially of a material that expands when subjected to heat, an inner rim portion and an outer-rim portion, rst exible means responsive to expansion of said material disposed between said target portion and said inner-rim portion, and second flexible means disposed between said inner-rim portion and said outer-rim portions.
  • a mask constituted essentially of thin metal and comprising an outer-rim portion for attachment to a support, an inner-rim portion connected to said outerrim by a bend in said thin-metal and a central apertured target portion connected to said inner-rim by a second bend in the thin-metal.
  • a mask constituted essentially of thin metal and comprising a circular outer-rim portion for attachment to a support, a frusto-conical inner-rim portion connected to said outer-rim by a bend in said thin-metal and a central vomt-portion in the form of a circular section of a spherical shell containing a multiplicity of systematically arranged apertures and connected to said innerrim by a second bend in said thin-metal.
  • a mask constituted essentially of thin metal and comprising a rectangular outer-rim portion for attachment to a support, a frusto-pyramidal inner-rim portion connected to said rectangular outer-rim on each of its sides by a bend in said thin metal, and a central electrontarget portion in the form of a rectangular section of a curved surface containing a multiplicity of systematically arranged apertures and connected to said inner-rim on each of its sides by a second bend in said thin-metal.

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  • Electrodes For Cathode-Ray Tubes (AREA)
US450733A 1954-08-18 1954-08-18 Color kinescopes Expired - Lifetime US2795718A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE540599D BE540599A (fr) 1954-08-18
US450733A US2795718A (en) 1954-08-18 1954-08-18 Color kinescopes
US450761A US2795719A (en) 1954-08-18 1954-08-18 Color-kinescopes
GB23348/55A GB811936A (en) 1954-08-18 1955-08-12 A mask assembly for cathode ray tubes
FR1129827D FR1129827A (fr) 1954-08-18 1955-08-17 Tube électronique
DER17289A DE964064C (de) 1954-08-18 1955-08-19 Elektronenstrahlroehre mit Viellochblende

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US450733A US2795718A (en) 1954-08-18 1954-08-18 Color kinescopes

Publications (1)

Publication Number Publication Date
US2795718A true US2795718A (en) 1957-06-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
US450733A Expired - Lifetime US2795718A (en) 1954-08-18 1954-08-18 Color kinescopes

Country Status (5)

Country Link
US (1) US2795718A (fr)
BE (1) BE540599A (fr)
DE (1) DE964064C (fr)
FR (1) FR1129827A (fr)
GB (1) GB811936A (fr)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897392A (en) * 1956-02-09 1959-07-28 Zenith Radio Corp Color television tube mask and frame assembly
US2922063A (en) * 1956-11-07 1960-01-19 Sylvania Electric Prod Target assembly for cathode ray tubes
US3370192A (en) * 1966-10-07 1968-02-20 Nat Video Corp Color television tube construction including means for minimizing temperature differential between shadow mask frame and tube envelope
US3370194A (en) * 1966-05-31 1968-02-20 Nat Video Corp Color tube mask mounting including means for limiting shift of the mask center
US3387160A (en) * 1967-01-11 1968-06-04 Nat Video Corp Mounting means for moving shadow mask axially forward upon heating
US3387159A (en) * 1966-10-28 1968-06-04 Nat Video Corp Color television tube mask mounting with aperture alignment maintenance during expansion
US3399319A (en) * 1966-10-18 1968-08-27 Nat Video Corp Color kinescope mounting assembly for shifting shadow mask during thermal expansion
US3524971A (en) * 1967-01-11 1970-08-18 Nat Video Corp Shadow mask mounting brackets moving mask toward screen with radial mask expansion
US3569759A (en) * 1968-07-15 1971-03-09 Kentucky Electronics Inc Shadow mask frame of sintered material for color tubes
US3617787A (en) * 1968-06-21 1971-11-02 Gerardus Wilhelmus Plukker Bimetallic spring support for a shadow mask
US3710165A (en) * 1970-07-03 1973-01-09 Tokyo Shibaura Electric Co Shadow mask perforated along intersection of side wall and reinforcing flange
US3737703A (en) * 1970-07-31 1973-06-05 Tokyo Shibaura Electric Co Shadow mask frame construction
DE2333865A1 (de) * 1972-07-03 1974-01-17 Rca Corp Verfahren zur herstellung einer provisorischen lochmaske fuer das drucken der leuchtstoffelemente auf dem bildschirm einer farbbildroehre
US3855493A (en) * 1972-10-30 1974-12-17 Gen Electric Shadow mask and process for manufacture
US3862448A (en) * 1971-09-03 1975-01-21 Hitachi Ltd Colour picture tube including shadow mask having self-compensation function for thermal stress
FR2397062A1 (fr) * 1977-07-08 1979-02-02 Rca Corp Tube a rayons cathodiques a masque d'ombre
US4439709A (en) * 1982-04-29 1984-03-27 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4455505A (en) * 1981-09-04 1984-06-19 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4460843A (en) * 1982-04-29 1984-07-17 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US6384522B1 (en) * 1997-03-14 2002-05-07 Kabushiki Kaisha Toshiba Color cathode ray tube for reducing landing drift of electron beams on phosphor layers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1789183C1 (de) * 1965-07-16 1977-04-14 Rca Corp Kathodenstrahlroehre zur Farbbildwiedergabe
NL151552B (nl) * 1967-02-02 1976-11-15 Philips Nv Kleurentelevisieweergeefbuis.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2546828A (en) * 1950-02-17 1951-03-27 Nat Union Radio Corp Target assembly for cathode-ray tubes
US2611100A (en) * 1950-12-05 1952-09-16 Rca Corp Temperature-compensated target assembly for color-kinescopes, etc.
USRE23735E (en) * 1953-11-10 Grid mounting fob color television
US2682620A (en) * 1952-05-29 1954-06-29 Du Mont Allen B Lab Inc Cathode-ray tube

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE23735E (en) * 1953-11-10 Grid mounting fob color television
US2546828A (en) * 1950-02-17 1951-03-27 Nat Union Radio Corp Target assembly for cathode-ray tubes
US2611100A (en) * 1950-12-05 1952-09-16 Rca Corp Temperature-compensated target assembly for color-kinescopes, etc.
US2682620A (en) * 1952-05-29 1954-06-29 Du Mont Allen B Lab Inc Cathode-ray tube

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2897392A (en) * 1956-02-09 1959-07-28 Zenith Radio Corp Color television tube mask and frame assembly
US2922063A (en) * 1956-11-07 1960-01-19 Sylvania Electric Prod Target assembly for cathode ray tubes
US3370194A (en) * 1966-05-31 1968-02-20 Nat Video Corp Color tube mask mounting including means for limiting shift of the mask center
US3370192A (en) * 1966-10-07 1968-02-20 Nat Video Corp Color television tube construction including means for minimizing temperature differential between shadow mask frame and tube envelope
US3399319A (en) * 1966-10-18 1968-08-27 Nat Video Corp Color kinescope mounting assembly for shifting shadow mask during thermal expansion
US3387159A (en) * 1966-10-28 1968-06-04 Nat Video Corp Color television tube mask mounting with aperture alignment maintenance during expansion
US3387160A (en) * 1967-01-11 1968-06-04 Nat Video Corp Mounting means for moving shadow mask axially forward upon heating
US3524971A (en) * 1967-01-11 1970-08-18 Nat Video Corp Shadow mask mounting brackets moving mask toward screen with radial mask expansion
US3617787A (en) * 1968-06-21 1971-11-02 Gerardus Wilhelmus Plukker Bimetallic spring support for a shadow mask
US3569759A (en) * 1968-07-15 1971-03-09 Kentucky Electronics Inc Shadow mask frame of sintered material for color tubes
US3710165A (en) * 1970-07-03 1973-01-09 Tokyo Shibaura Electric Co Shadow mask perforated along intersection of side wall and reinforcing flange
US3737703A (en) * 1970-07-31 1973-06-05 Tokyo Shibaura Electric Co Shadow mask frame construction
US3862448A (en) * 1971-09-03 1975-01-21 Hitachi Ltd Colour picture tube including shadow mask having self-compensation function for thermal stress
DE2333865A1 (de) * 1972-07-03 1974-01-17 Rca Corp Verfahren zur herstellung einer provisorischen lochmaske fuer das drucken der leuchtstoffelemente auf dem bildschirm einer farbbildroehre
US3855493A (en) * 1972-10-30 1974-12-17 Gen Electric Shadow mask and process for manufacture
FR2397062A1 (fr) * 1977-07-08 1979-02-02 Rca Corp Tube a rayons cathodiques a masque d'ombre
US4146816A (en) * 1977-07-08 1979-03-27 Rca Corporation Cathode-ray tube with a corrugated mask having a corrugated hinging skirt
US4455505A (en) * 1981-09-04 1984-06-19 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4439709A (en) * 1982-04-29 1984-03-27 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US4460843A (en) * 1982-04-29 1984-07-17 Rca Corporation Color picture tube having improved temperature compensating support for a mask-frame assembly
US6384522B1 (en) * 1997-03-14 2002-05-07 Kabushiki Kaisha Toshiba Color cathode ray tube for reducing landing drift of electron beams on phosphor layers

Also Published As

Publication number Publication date
BE540599A (fr)
FR1129827A (fr) 1957-01-28
GB811936A (en) 1959-04-15
DE964064C (de) 1957-05-16

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