KR870008371A - Front assembly for cathode ray tube - Google Patents

Abstract

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Description

Front assembly for cathode ray tube

Since this is an open matter, no full text was included.

FIG. 2 is a side view of the color cathode ray tube of FIG. 1 showing the first and other components together with a cutaway showing a novel front assembly of the present invention comprising a metal frame with welded tensile foil shadow mask and mounted on a freestanding plate. Perspective view.

3 is an elevational view of a funnel divided by an interval of 120 degrees azimuth and abutted faceplate, detailing a metal frame welded with a tension foil shadow mask and equipped with an independent faceplate according to the present invention.

4 is a perspective view showing a cross section of the front assembly and its structure according to the present invention and showing a slurry flowing through another embodiment of a metal frame equipped with a freestanding plate according to the present invention during a radial flow fill screening process.

4A is a top perspective view of the cross section of FIG. 4 showing the slurry passage structure in detail.

Claims (30)

In the front assembly for a cathode ray tube, In fact, the flat faceplate has a centrally located in-screen on the inner face surrounded by a peripheral seal adapted to engage the funnel, and the frame means with a strong independent faceplate comprises a weldable metal and at a distance from the inner face of the faceplate. Fixed to an inner surface between the seal and the screen to support a positioned welded tensile foil shadow mask, the mask having a central aperture and a peripheral portion welded to the frame means and the bond between the frame and the faceplate is a foil mask A front assembly having such area and strength that can withstand virtually all tensile forces exerted by it. The method of claim 1, And the frame means comprises a frame made of a weldable metal supporting a welded tensile foil shadow mask extending in all directions in the mask plane of the faceplate. The method according to claim 1 or 2, And the sealing portion of the faceplate has three radially directed V-shaped grooves for indexing the faceplate in combination with a circular auxiliary indexing means associated with the funnel. The method according to any one of claims 1 to 3, The frame means comprises a discrete or segmented independent metal frame fixed to an inner face of the faceplate. The method according to any one of claims 1 to 4, And said frame is in the form of a triangle. The method according to any one of claims 1 to 4, And said frame is substantially rectangular in cross section or trapezoid in cross section. The method according to any one of the preceding claims, The faceplate of the color cathode ray tube is suitable for receiving during production a uniform coating of insulator by radial flow filling process, and the frame means contact a plurality of inner surfaces of the faceplate to pass excess slurry during the slurry precipitation process. A front assembly having a slurry passage structure. The method of claim 7, wherein The slurry passage structure consists of a pillar attached to the inner surface and has a hole in the pillar, the pillar having a cross section efficient to promote radial flow of the slurry with minimal post-cleaning. The method according to any one of claims 1 to 3, And the frame means has a shadow mask support structure consisting of a thin plate fixed to an inner surface of the face plate at opposite sides of the screen. The method of claim 9, The thin plate support structure has a flat surface having a width of 5 to 100 mils for receiving and securing the foil shadow mask as a tensile force and more on the inside of the faceplate than the peak to accurately define the peak and the desired mask-to-screen Q-distance. And a second surface extending closer radially outwardly. The method of claim 9, The thin shadow mask support structure is hollow with a substantially inverted " V " cross sectional shape, the peak being a tensile force for receiving and securing the foil shadow mask and a second surface extending radially outward at the peak and inclined downwards. And the second surface is closer to the faceplate inner surface than the first surface such that the peak accurately defines the desired mask-to-screen Q-distance. The method of claim 11, The hollow shadow mask support structure has a hardened cement disposed therein, the cement being effective to attach the structure to the faceplate and to strengthen the structure against deflection due to high tension of the mask. The method of claim 9, The thin shadow mask support structure comprises a compression member for holding and securing the mask at a predetermined Q-distance from the screen, and a tension member radially external from the compression member to withstand the high return forces developed in the mask. . The method of claim 13, The tension member is a front assembly, characterized in that the separated structure for supporting the compression member. The method of claim 13, And the tension member is an integral extension of the compression member. The method according to claim 9 or 10, And the shadow mask support structure has a cross section in the shape of a hollow metal tube fixed to an inner surface at opposite sides of the screen. The method according to any one of the preceding claims, And the frame means comprises a shadow mask support structure having at least one foot placed on an inner surface of the faceplate to support and stabilize the shadow mask support structure so as not to overturn from the high tension of the shadow mask. The method of claim 17, Wherein the foot is rotated in or out and preferably has a practical heel. The method of claim 18, And the support structure has two feet for supporting and stabilizing the support structure such that the support structure is not overturned due to high tension of the mask. The method of claim 19, One foot rotates inward and the other foot rotates outward. The method of claim 19, Wherein the two feet rotate inward or outward. The method according to any one of claims 17 to 21, The foot or each foot is provided with a plurality of holes or notches in the open or closed end, the holes facilitating the passage of cement to secure the support structure to the face plate through the foot and also fixing the structure to the inner surface. Exposing a cemented contact edge to reinforce the front assembly. In the front assembly for a color cathode ray tube comprising a face plate having an inner surface of the screen portion disposed in the center for receiving the process coating in the spin application process, The shadow mask support structure fixed to the inner surface on the opposite side of the screen area has a first surface for receiving and securing the foil shadow mask, and a first surface for efficient treatment of excess encapsulant applied during the spin application from the screen area. And a second surface inclined to the screen portion, thereby avoiding discontinuities in application seen by the viewer and non-adherence of phosphorus resulting in over-cleaning and agglomeration of phosphorus. The method of claim 23, The inclination of the second surface is in the range of 91 degrees to 135 degrees with respect to the plane of the screen portion and is preferably about 120 degrees. The method of claim 23 or 24, The screen portion disposed in the center of the face plate has an electroconductive dag deposit that separates the triad of the electron load excitable infiltrate, and the shadow mask support structure is electrically charged and extends from the dag of the screen portion to be electrically connected with the dag. And a deposit of an electrically conductive dag, whereby the screen portion is charged to the same potential difference as the electrically charged shadow mask support structure. The method of claim 1, The frame means comprises a shadow mask support structure made of ceramic material, such as a post-terramate, which is fixed to the inner face of the faceplate on the opposite side of the screen and within the seal, and substantially larger than the width of the support structure at 1.27 mm (0.05 inch). And an independent weldable metal cap having a flat surface having a width in the range of. The method of claim 26, Said cap having a separate metal strip secured to said support structure, said cap having a width in a range from 1.27 mm to a width substantially greater than the width of the support structure. A front assembly for cathode ray tubes comprising a face plate having a peripheral seal adapted to engage a funnel and an in-screen disposed centrally at an inner surface thereof, Four separate rails consisting of ceramic fixed to the inner surface of the screen opposing side between the seal and the screen to receive and support the foil shadow mask as a tensile force at a distance from the screen, and form a generally rectangular single shadow mask support structure. Means for interconnecting the separating rails, the interconnecting means having a continuous or discontinuous weldable metal cap which is covered on each rail for receiving and securing the shadow mask by welding means. Assembly. A front assembly for a color cathode ray tube comprising a glass face plate having a peripheral seal portion adapted to engage a funnel and an in-screen centered at the inner surface thereof, Having an independent metal frame located between the seal and the screen to support the tension foil shadow mask at a distance from the inner face of the face plate, the frame being integrally fixed to an independent frame support means fixed to the inner face of the face plate, Wherein the frame obtains at least a substantial part of the stiffness from the faceplate. The method of claim 29, The frame support means has an expansion coefficient equal to the expansion coefficient of the glass of the face plate or in the middle of the expansion coefficient of the glass and metal frame in order to efficiently absorb the stresses generated by other expansion and contraction coefficients of the glass and metal frame. A front assembly comprising a metal. ※ Note: The disclosure is based on the initial application.