US3617787A - Bimetallic spring support for a shadow mask - Google Patents

Bimetallic spring support for a shadow mask Download PDF

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Publication number
US3617787A
US3617787A US834684A US3617787DA US3617787A US 3617787 A US3617787 A US 3617787A US 834684 A US834684 A US 834684A US 3617787D A US3617787D A US 3617787DA US 3617787 A US3617787 A US 3617787A
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Prior art keywords
mask
spring
expansion
springs
support
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Expired - Lifetime
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US834684A
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English (en)
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Gerardus Wilhelmus Plukker
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Individual
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Individual
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12861—Group VIII or IB metal-base component
    • Y10T428/12951—Fe-base component
    • Y10T428/12958—Next to Fe-base component
    • Y10T428/12965—Both containing 0.01-1.7% carbon [i.e., steel]

Definitions

  • the invention relates to a color television picture tube comprising a window having an upright edge, a cone and a neck and in which near the luminescent screen a substantially rectangular color selection electrode, for example, a shadow mask, is provided, which electrode is supported by the upright edge of the window by means of at least three strip-shaped springs placed along the straight sides of the color selection electrode, the color selection electrode, upon being heated, being moved towards the screen by means of bimetallic components, so that the electron beams always impinge upon the correct phosphor dots.
  • a substantially rectangular color selection electrode for example, a shadow mask
  • said movement towards the screen is obtained by means of flat springs arranged along the straight sides and each consisting of two strips which are welded together with their narrow sides and extend in the length of the spring and together constitutes a bimetal. These strips are arranged substantially parallel to the edge of the associated straight sides of the color selection electrode and welded to said electrode with one end, the other free end being supported by the upright edge of the window by means of a supporting point.
  • the color selection electrode upon being heated, will experience a displacement in a plane at right-angles to the tube axis. This may be both a displacement in the lateral direction and a rotation of the axes of said electrodes extending at right-angles to the straight sides.
  • the expansion of each spring will hence have to be equal to that of the part of the color selection electrode situated between the connection point of the spring to said electrode and the center of the side extending according to the longitudinal axis of said spring.
  • each flat spring consists of two strips which are secured together with one narrow side and which extend along the longitudinal axis.
  • Each strip consists of one of the metals constituting together a bimetal.
  • One end of the spring is secured to the color selection electrode and the other free end is supported by the upright edge of the window by means of a supporting point.
  • This supporting point is situated, dependent upon the location and the position of the spring with respect to the center of the associated straight side of the color selection electrode, on a line at right-angles to the welding seam at such a distance from said welding seam that the expansion of the free part of the spring between the connection point and the supporting point is substantially equal to the expansion of the part of the color selection electrode situated between the connection point of the spring and the center of the straight side of the color selection electrode associated with said spring.
  • the coefficient of expansion of the spring is adapted to the expansion of the part of the straight side of the color selection electrode situated between the connection point of the spring and the center of said side.
  • FIGS. 1 and 2 diagrammatically show a color selection electrode in the form of a shadow mask.
  • FIGS. 3 and 4 are elevations of a bimetallic spring according to the invention.
  • FIG. 5 is a plan view ofFIG. 4, while FIG. 6 is a perspective view of a mounted bimetallic spring shown in FIG. 3.
  • FIG. 7 is a side view of the front section of a color-television tube showing the fluorescent screen, shadow mask and bimetallic springs.
  • reference numeral 1 denotes the perimeter of a shadow mask which is suspended, by means of bimetallic springs 2, 3 and 4 and supporting points 5, in an upright edge of a window 21 provided with a fluorescent screen 22 of a color television picture tube.
  • the springs are welded to the mask at 6.
  • the overall expansion of. the spring 2 will have to be equal to the expansion of the part 7 of the mask 1, because the supporting point 5 of said spring lies just opposite to the center of the associated straight side of the mask. So the spring 2 must have the same coefficient of expansion as the mask 1.
  • the spring 3 must have no expansion for the center of the associated straight side of the mask I to which the spring is secured to remain in its place, since the expansion of the mask from said center upwards and downwards is equal and the connection point 6 of spring 3 and the mask 1 lies just on a center line through said center M. In order that this point may not be displaced by expansion of the spring 3 with respect to the supporting point 5 of said spring the coefficient of expansion of the spring 3 must be zero.
  • the expansion of the part 8 of the mask is equal to that of the spring 4. In this case the part 8 is approximately twice as long as the length of the spring 4,
  • the spring 2 shown in FIG. 3 consists of a part 6 which is welded to the edge of the mask and the strip I2 of which is bent around the edge along the line 15 to obtain a larger rigidity of the connection as is shown in FIG. 6.
  • the spring 2 consists of a strip 10 extending in a direction toward the screen and consisting of chromium-nickel steel having 18 percent by weight of chromium and 8 percent by weight of nickel and a coefficient of expansion of 17x10, and a strip 11 consisting of Invar (36 percent by weight of Ni, 64 percent by weight of Fe) having a coefficient of expansion of 1X10.
  • the expansion of the spring is determined by the free length 20.
  • a coefficient of expansion of the spring of 1X10 will apply.
  • the supporting point 13 is situated on the welding seam 14 of the strips 10 and 11, so that an intermediate coefficient of expansion is obtained (FG in FIG. 4). Since the coefficient of expansion of the material of the mask which consists of soft steel is approximately 12x10, the spring 2 shown in FIG. 3 will hence have approximately the same coefficient of expansion as the mask 1, which is required.
  • the supporting point 13 is situated entirely on the extreme edge of the strip 17 which consists of lnvar.
  • the strip 17 comprises a lug 18, since actually the supporting point always has a given dimension.
  • the effect of the coefficient of expansion can be intensified. If, for example, the lug 18, in which the supporting point 13 is situated (FIG. 4), is elongated so that the supporting point 13 becomes located farther from the welding seam 19, even the effect of a shortening of the spring length can be obtained (EC in FIG. 4). 1f the supporting point would be provided on such a lug (not shown) of the chromium-nickel steel strip 16, an extra large coefficient of expansion could be obtained.
  • the invention consequently permits obtaining a movement of the mask towards the screen by the bimetal effect and also of obtaining the correct coefficient of expansion by the location of the aperture for the supporting point of the strip, so that the screen does not move in a direction at right-angles to the axis of the tube, notwithstanding the three-point suspen- Sln.
  • the invention can be applied not only to other color selection electrodes, for example, in the form of a wire grid for afterdeflection focusing, which grid is provided close in front of the luminescent screen, but also in all those cases in which the coefficient of expansion of a given strip must be adaptable to that of several other components. It is alternatively possible to use more than three springs.
  • a cathode ray tube comprising an evacuated envelope having a longitudinal axis and a substantially rectangular window portion at one end thereof intersecting said axis at rightangles, a plurality of phosphor triads constituting a luminescent screen disposed on said window, a substantially rectangular shadow mask having apertures therein aligned with said phosphor triads, and at least three strip-shaped flat springs positioned along the sides of the mask for supporting said shadow mask, each of said springs comprising two strips each of a different metal and each having a given longitudinal axis, said strips being joined along an edge extending in a direction parallel to the longitudinal axis of each strip, one end of said spring being secured to said mask and the other end being supported by an upright edge of the window by means of a support with the flat sides of said strips being parallel to the upright sides of the mask, said support being positioned on a line at right-angles to the joined edge at a distance therefrom at which the expansion of a free portion of the spring between the end

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  • Electrodes For Cathode-Ray Tubes (AREA)
US834684A 1968-06-21 1969-06-19 Bimetallic spring support for a shadow mask Expired - Lifetime US3617787A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL686808720A NL150613B (nl) 1968-06-21 1968-06-21 Kleurselectieelektrodesamenstel voor een kleurentelevisieweergeefbuis en ophangorgaan voor en kleurentelevisieweergeefbuis voorzien van een dergelijk kleurselectieelektrodesamenstel.

Publications (1)

Publication Number Publication Date
US3617787A true US3617787A (en) 1971-11-02

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ID=19803951

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Application Number Title Priority Date Filing Date
US834684A Expired - Lifetime US3617787A (en) 1968-06-21 1969-06-19 Bimetallic spring support for a shadow mask

Country Status (8)

Country Link
US (1) US3617787A (xx)
AT (1) AT289216B (xx)
BE (1) BE734859A (xx)
BR (1) BR6910003D0 (xx)
ES (1) ES368553A1 (xx)
FR (1) FR2011387A1 (xx)
GB (1) GB1201016A (xx)
NL (1) NL150613B (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700948A (en) * 1970-07-09 1972-10-24 Motorola Inc Edge-bonded bi-metallic strip extending from metal plate on shadow mask to stud via spring of substantially smaller cross-sectional area than strip
US3896321A (en) * 1973-12-12 1975-07-22 Zenith Radio Corp System for suspending a color selection electrode in a color cathode ray tube
US4012661A (en) * 1973-08-22 1977-03-15 General Electric Company Thermal compensation for color television picture tube aperture mask
US4524298A (en) * 1983-07-05 1985-06-18 North American Philips Consumer Electronics Corp. Color cathode ray tube incorporating improved thermal compensation type aperture mask supporting means
US4528475A (en) * 1983-05-09 1985-07-09 Rca Corporation Color picture tube having spring supports for a mask-frame assembly
US4572983A (en) * 1984-03-29 1986-02-25 Rca Corporation Color picture tube having an improved support structure for a color selection electrode
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask
US5066886A (en) * 1989-10-31 1991-11-19 Carpenter Technology Corporation Thermally responsive article, method of making same, and a device incorporataing said article
US6452318B1 (en) * 1998-03-31 2002-09-17 Kabushiki Kaisha Toshiba Elastic support member for color CRT
US20050174033A1 (en) * 2004-02-10 2005-08-11 Matsushita Toshiba Picture Display Co., Ltd. Color cathode-ray tube

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795718A (en) * 1954-08-18 1957-06-11 Rca Corp Color kinescopes
US3449611A (en) * 1966-06-22 1969-06-10 Nat Video Corp Suspension system for color television tube mask
US3454813A (en) * 1968-09-12 1969-07-08 Admiral Corp Mask-frame captivator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2795718A (en) * 1954-08-18 1957-06-11 Rca Corp Color kinescopes
US3449611A (en) * 1966-06-22 1969-06-10 Nat Video Corp Suspension system for color television tube mask
US3454813A (en) * 1968-09-12 1969-07-08 Admiral Corp Mask-frame captivator

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3700948A (en) * 1970-07-09 1972-10-24 Motorola Inc Edge-bonded bi-metallic strip extending from metal plate on shadow mask to stud via spring of substantially smaller cross-sectional area than strip
US4012661A (en) * 1973-08-22 1977-03-15 General Electric Company Thermal compensation for color television picture tube aperture mask
US3896321A (en) * 1973-12-12 1975-07-22 Zenith Radio Corp System for suspending a color selection electrode in a color cathode ray tube
US4528475A (en) * 1983-05-09 1985-07-09 Rca Corporation Color picture tube having spring supports for a mask-frame assembly
US4524298A (en) * 1983-07-05 1985-06-18 North American Philips Consumer Electronics Corp. Color cathode ray tube incorporating improved thermal compensation type aperture mask supporting means
US4572983A (en) * 1984-03-29 1986-02-25 Rca Corporation Color picture tube having an improved support structure for a color selection electrode
US4792719A (en) * 1987-08-31 1988-12-20 Gte Products Corporation Edge-bonded bimetal compensator for shadow mask
US5066886A (en) * 1989-10-31 1991-11-19 Carpenter Technology Corporation Thermally responsive article, method of making same, and a device incorporataing said article
US6452318B1 (en) * 1998-03-31 2002-09-17 Kabushiki Kaisha Toshiba Elastic support member for color CRT
US20050174033A1 (en) * 2004-02-10 2005-08-11 Matsushita Toshiba Picture Display Co., Ltd. Color cathode-ray tube
US7227299B2 (en) * 2004-02-10 2007-06-05 Matsushita Toshiba Picture Display Co., Ltd. Color cathode-ray tube

Also Published As

Publication number Publication date
BR6910003D0 (pt) 1973-01-11
NL150613B (nl) 1976-08-16
FR2011387A1 (xx) 1970-02-27
BE734859A (xx) 1969-12-19
AT289216B (de) 1971-04-13
GB1201016A (en) 1970-08-05
ES368553A1 (es) 1971-05-01
NL6808720A (xx) 1969-12-23
DE1927966A1 (de) 1970-02-26
DE1927966B2 (de) 1977-06-30

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