US3743878A - Parallel barrier supporting system having spring movement limiter - Google Patents

Parallel barrier supporting system having spring movement limiter Download PDF

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Publication number
US3743878A
US3743878A US00789691A US3743878DA US3743878A US 3743878 A US3743878 A US 3743878A US 00789691 A US00789691 A US 00789691A US 3743878D A US3743878D A US 3743878DA US 3743878 A US3743878 A US 3743878A
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United States
Prior art keywords
spring
frame
barrier
attached
springs
Prior art date
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Expired - Lifetime
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US00789691A
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English (en)
Inventor
G Kautz
A Kuryla
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GTE Sylvania Inc
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GTE Sylvania Inc
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Assigned to NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. reassignment NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP. ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981. (SEE DOCUMENT FOR DETAILS). Assignors: GTE PRODUCTS CORPORATION A DE CORP.
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Expired - Lifetime legal-status Critical Current

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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

  • Color cathode ray tubes of the type currently being utilized in color television receivers employ a patterned screen of different colored lightemitting phosphors.
  • An electron beam source which generally comprises an electron gun for each of the phosphors on the screen, is positioned remotely from the screen.
  • a parallax barrier for aiding in color selection is positioned intermediate the screen and the electron source, but closer to the screen.
  • the parallax barrier must be releasably mounted in the tube. This is accomplished by means of a plurality of leaf support springs which are fastened either at one of their ends to a side wall of the barrier, or to an intermediate support which is attached to the side wall and at their free ends cooperate with holding means, for example, studs, which are formed on an interior side wall of the cathode ray tube.
  • leaf support springs which are fastened either at one of their ends to a side wall of the barrier, or to an intermediate support which is attached to the side wall and at their free ends cooperate with holding means, for example, studs, which are formed on an interior side wall of the cathode ray tube.
  • a three-point support system has distinct advantages over other systems in that the three points inherently define a plane, thus making assembly and disassembly much easier.
  • a certain disadvantage exists under some conditions with the three-point system. To understand this disadvantage, a knowledge of the geometry of the system is necessary.
  • the display area of the screen is substantially rectangular with an aspect ratio of approximately 4 to 3.
  • the long side of the rectangle is horizontally positioned for normal viewing.
  • One of the support springs is positioned on one of the long sides, generally the uppermost, and the other two are positioned on the two short sides.
  • the short side springs are substantially oppositely disposed from one another and are approximately 90 to 120 from the uppermost spring to equalize the support as much as possible. Because of the rectangular aspect ratio of the tubes, it is sometimes not possible to achieve perfect symmetry in the spring spacing; however, it is desirable to come as close to this as possible.
  • the substantially oppositely disposed side springs inherently define therebetween a pivot plane. If the tube, when mounted in a receiver, is subjected to a severe jolt, such as from being dropped, the upper portion of the barrier may be pitched forward,-pivoting about the plane defined by the two side springs. If the jolt is severe enough, the welds joining the top spring may be fractured, or the spring may be forced beyond its elastic limit resulting in permanent deformation thereto. If either of the above occur, the result is a loss of registration between the screen and the apertures in the barrier and the tube will no longer perform properly. The amount of shock necessary to cause the above-described malfunction is not excessive and may quite readily occur during normal shipping of the receivers.
  • a color cathode ray tube employing a three-point suspension system which has means associated with one of the support springs for restricting the tendency of the barrier to pivot about the plane defined by the other two support springs.
  • FIG. 2 is a sectional plan view of the screen portion of a color cathode ray tube employing the invention
  • FIG. 3 is a perspective view of a parallax barrier employing the invention.
  • FIG. 4 is a diagrammatic view of the amount of movement in a prior art tube when viewed along a line such as 4-4 of FIG. 2;
  • FIG. 5 is a view similar to FIG. 4 showing the amount of barrier movement in a tube utilizing the invention
  • FIG. 6 is a partial elevational view of a barrier incorporating one embodiment of the invention.
  • FIG. 1 a color cathode ray tube 10 having a face plate 12 with a patterned phosphor screen 14 disposed on the interior surface thereof.
  • a peripheral side wall 16 extends from the face plate 12 and joins a substantially funnel-shaped body l8.
  • the narrow end of the funnel terminates in a cylindrical neck 20 which encloses an electron source 22 in the form of a plurality of electron guns.
  • a parallax barrier 24 is releasably mounted within the tube adjacent the screen portion.
  • the tube is evacuated as is conventional in the artand is provided with suitable leads (not shown) for making electrical connection to the proper components.
  • the parallax barrier 24 comprises a relatively fragile apertured portion 26 which is affixed at its peripheral edge to a relatively rigid frame 28.
  • the frame provides the parallax barrier side walls 30 to which the springs are attached.
  • the configuration of the apertures in portion 26 may be either substantially circular or rectangular depending upon the screen pattern.
  • the supporting system may be seen more clearly as comprising three support springs; an uppermost spring 32; and two short side springs 34a and 34b, respectively.
  • the springs are shown as being attached to the side walls 30 of the barrier frame 28 through the intermediary of temperature-compensating bimetallic base plate 36, which may be of the type described in US. Pat. No. 3,330,980.
  • FIGS. 4 and the base plate 36 is eliminated for the purpose of clarity and the springs are shown as being attached directly to the side wall.
  • the apparatus of the invention is equally applicable to either type of mounting system.
  • the two side springs 34a and 34b are substantially oppositely disposed and define therebetween a pivot plane, designated herein as 38.
  • This pivot plane is generally positioned substantially below the horizontal axis of the tube and obviously the greater the distance it is so removed from the horizontal axis the greater will be the tendency to pivot.
  • the pivot-restricting means 40 comprises an upright segment 42 which is fixed on side wall, 30 and extends in a direction normal thereto. It is positioned on the side of the spring remote from the screen. It may take several forms but in a preferred embodiment of the invention it forms one leg of an L-shaped member which has its other leg 43 welded or otherwise permanently affixed to side wall 30.
  • the purpose of the invention is not necessarily to completely stop the pivoting action but to at least restrict the amount of movement of the barrier to that which is less than the amount necessary to fracture the welds or which is within the elastic limits of the spring so that permanent deformation will not result.
  • FIG. 4 illustrates a prior art tube that does not incorporate the invention.
  • the solid portion of the drawing illustrates the normal position of the barrier and the phantomed portion illustrates the movement that occurs when the tube is subjected to a severe jolt.
  • the upper portion of the barrier pitches forward at such time, pivoting about the inherently defined pivot plane 38.
  • the action that occurs is a twisting one since the uppermost spring 32 is fixed at one of its ends 44 to the side wall 30 and at its other end 46 is free to rotate about the stud 48 which is fixed in face plate side wall 16. This twisting action exerts considerable strain upon the welds fastening end 44 to side wall 30.
  • FIG. 5 The movement of the barrier when the instant invention is utilized is shown in FIG. 5. Now, undera similar jolt the barrier begins to move forward until the spring 32 hits pivot restricting means 40; then, because the spring 32 is bound on stud 48 and cannot move, the frame binds on means 40 and its movement is stopped before any of the above-described deleterious effects can occur. After the duration of the shock or jolt, the natural resiliency of the spring will return the barrier to its original position.
  • a substantially rectangular color cathode ray tube comprising: an evacuated envelope having at one end an enlarged face plate portion with a mosaic phosphor screen on the interior surface thereof and at the other end thereof an electron gun formed to provide electron beams directed to impinge upon said screen; and a parallax barrier to aid in color selection mounted adjacent said screen, said barrier comprising a relatively fragile foraminated portion attached at its peripheral edge to a circumferential frame, said barrier being supported by means of three elongated support springs attached at one of their ends to a side wall of said frame and at the other of their ends to a side wall of said tube, two of said springs being attached to the short sides of said frame and the third spring being attached to one of the long sides; and extending therealong substantially parallel to the direction of said long side; said two of said springs being oppositely positioned to inherently define a pivot plane therebetween; and means formed adjacent said third spring and having a flat side substantially parallel thereto and attached to said frame and extending therefrom in a direction substantially normal to said
  • a parallax barrier for a color cathode ray tube comprising: a fragile, foraminous portion attached at its peripheral edge to walls of a rigid surrounding frame, said barrier being substantially rectangular in configuration and having a plurality of springs affixed to said walls, two of said springs being substantially oppositely disposed on the short sides of said frame and a third spring being attached on one of the long sides of said frame and extending therealong substantially parallel to the direction of said long side; and an upstanding member projecting perpendicularly from said frame side wall adjacent said third spring, said member having a flat side which is substantially parallel to saidspring.

Landscapes

  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Electrodes For Cathode-Ray Tubes (AREA)
US00789691A 1969-01-08 1969-01-08 Parallel barrier supporting system having spring movement limiter Expired - Lifetime US3743878A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US78969169A 1969-01-08 1969-01-08

Publications (1)

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US3743878A true US3743878A (en) 1973-07-03

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US00789691A Expired - Lifetime US3743878A (en) 1969-01-08 1969-01-08 Parallel barrier supporting system having spring movement limiter

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US (1) US3743878A (fr)
BE (1) BE744095A (fr)
CA (1) CA927467A (fr)
DE (1) DE6949420U (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4317064A (en) * 1979-10-15 1982-02-23 Zenith Radio Corporation Shadow mask suspension system
US4916357A (en) * 1987-04-16 1990-04-10 Kabushiki Kaisha Toshiba Shadow mask assembly of a color cathode ray tube
EP3460865A4 (fr) * 2016-05-19 2020-01-29 BOE Technology Group Co., Ltd. Appareil d'application de force antagoniste, appareil de fabrication de masque et procédé correspondant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330980A (en) * 1965-07-16 1967-07-11 Rca Corp Shadow mask mounted with bi-metallic sections connected by expansible loop
US3370194A (en) * 1966-05-31 1968-02-20 Nat Video Corp Color tube mask mounting including means for limiting shift of the mask center
US3454813A (en) * 1968-09-12 1969-07-08 Admiral Corp Mask-frame captivator
US3524972A (en) * 1967-10-05 1970-08-18 Nat Video Corp Shadow mask bimetal strip means with motion-limiting bumper

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330980A (en) * 1965-07-16 1967-07-11 Rca Corp Shadow mask mounted with bi-metallic sections connected by expansible loop
US3370194A (en) * 1966-05-31 1968-02-20 Nat Video Corp Color tube mask mounting including means for limiting shift of the mask center
US3524972A (en) * 1967-10-05 1970-08-18 Nat Video Corp Shadow mask bimetal strip means with motion-limiting bumper
US3454813A (en) * 1968-09-12 1969-07-08 Admiral Corp Mask-frame captivator

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4317064A (en) * 1979-10-15 1982-02-23 Zenith Radio Corporation Shadow mask suspension system
US4916357A (en) * 1987-04-16 1990-04-10 Kabushiki Kaisha Toshiba Shadow mask assembly of a color cathode ray tube
EP3460865A4 (fr) * 2016-05-19 2020-01-29 BOE Technology Group Co., Ltd. Appareil d'application de force antagoniste, appareil de fabrication de masque et procédé correspondant

Also Published As

Publication number Publication date
BE744095A (fr) 1970-06-15
DE6949420U (de) 1970-05-06
CA927467A (en) 1973-05-29

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AS Assignment

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.,

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708

Owner name: NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP.

Free format text: ASSIGNS ITS ENTIRE RIGHT TITLE AND INTEREST, UNDER SAID PATENTS AND APPLICATIONS, SUBJECT TO CONDITIONS AND LICENSES EXISTING AS OF JANUARY 21, 1981.;ASSIGNOR:GTE PRODUCTS CORPORATION A DE CORP.;REEL/FRAME:003992/0284

Effective date: 19810708