Zenith Electronics Corporation

Zenith Radio Corporation

Raymond G Capek

Siegfried M Greiner

Lawrence W Dougherty

Mark T Fondrk

James R Fendley

David B Danielson

Elgie E Garrett

Richard K Althans

Hua Sou Tong

Leonard Dietch

James L Kraner

Mark Gartz

Kenneth L Fritsch

Anthony Cocco

Michael Livshits

Andrew S Parry

Jennifer M Knowlton

Robert F Hutton

Ann A Koss

Frank T Takahashi

A faceplate assembly for a color CRT includes a glass panel with a phosphor screen thereon and a plated mask support structure attached to the faceplate, with a foil shadow mask welded in tension to the mask support structure. The mask support structure comprises an inert substrate to which is electroformed a weld land suitable for accepting welds and retaining the mask thereby. A minimal amount of metal is used and the shape and size of the mask support are readily controllable.

CRT tension mask support structure

A covering for a discontinuity in a mask support frame for a tension mask cathode ray tube comprises a stiff yet flexible (or bendable) metal strip having a first surface for facing a mask frame surface which is proximal to a phosphor screen, and attachment to the mask frame on at least one side of the discontinuity, and a second surface facing the phosphor screen. A portion of the covering may be formed to match the cross-section profile of the mask frame surface to which it is attached. The covering may be formed in a continuous rectangle to form a rectangular frame assembly capable of attachment to a faceplate.

Stress transparent tension mask frame member for reducing slurry

An annulus attached adjacent the edge planes of a CRT front panel provides screen area savings, and in the preferred embodiment, panel protection, strengthening, and anti-implosion properties. The annulus is preferably composed of a plurality of sections and incorporates a shadow mask support. The annulus is attached to the front panel before receiving the shadow mask becomes a part of the CRT envelope. In a preferred embodiment, the annulus is composed of ceramic and is x-ray shielded by an application of lead-based frit.

In process tension mask CRT panel with peripheral bodies

Accelerated thermal upshock rates in the exhaust cycle of a CRT envelope are attained for a tension mask CRT having a shadow mask supporting rail frame affixed to the front panel. The actual corners of the rail frame are chamfered or left open to provide an increased separation distance from the corners of the funnel seal land. Panel fracturing stresses generated in the funnel seal area corners during upshock are thus alleviated allowing for faster CRT throughput during manufacture, without increasing the size of the CRT components.

Flat tension mask front panel CRT bulb with reduced front seal area

A CRT bulb with a flat front surface is utilized to provide a video display device having a planar front surface. The display device thus provided is easy to clean, easy to mount flush with planar surfaces, and requires no separate bezel over the display area.

Video display device with planar front surface

A color cathode ray tube is disclosed that includes a glass faceplate having on its inner surface a centrally disposed, rectangular screen. On each of opposed sides of the screen is plurality of discrete ceramic mask support segments to which are secured a tensed foil shadow mask. A process for fabrication is also disclosed.

Segmented shadow mask support structure for flat tension mask color crt

A means for attaining a predetermined CRT front panel configuration is disclosed as being particularly suitable for use with tensioned-mask CRTs having mask support means affixed to the front panel. A ceramic rail or the like is affixed to the front panel in opposition to the mask support to produce panel deformation forces counteracting those produced by the mask supports. In one embodiment, the panel is deformed more than is ultimately desired and the deformation structures are then ground to produce the desired panel configuration. Repeatability of screen curvature is thereby attained, allowing for interchangeable shadow mask and screen construction of the CRT.

CRT front panel with controlled configuration

An annulus attached adjacent the edge planes of a CRT front panel provides screen area savings, and in the preferred embodiment, panel protection, strengthening, and anti-implosion properties. The annulus is preferably composed of a plurality of sections and incorporates a shadow mask support. The annulus is attached to the front panel before receiving the shadow mask and becomes a part of the CRT envelope. In a preferred embodiment, the annulus is composed of ceramic and is x-ray shielded by an application of lead-based frit.

Peripheral bodies for tension mask CRT panel

A mask support structure is installated as a prefabricated unit in a tension mask color cathode ray tube having a faceplate with a centrally located screening area. The structure has a predetermined Q-height for ultimate affixation on opposed sides of the screening area by means of an inventive fixture and process, which is characterized by Q-height spacers. The structure has a base with a hardened layer of cement of selected thickness thereon for affixing the structure to the faceplate, and on an opposed side, a surface for receiving and securing the mask.

Provision of support for tension shadow mask by which a predetermined

A tension mask color CRT has a mask support structure so composed, configured and arranged as to create an accurately controllable and widely variable compressive strain in prescribed critical areas of the faceplate inner surface which strengthens the bulb.

Tension mask CRT front assembly with reduced strain-induced defects

A tension mask color cathode ray tube includes a glass faceplate having on its inner surface a centrally disposed, rectangular screening area, and on opposed sides thereof a non-metal shadow mask support structure of predetermined Q-height. The mask support structure has a metal element embedded in the apex of the structure. The apex of the structure and the metal element are ground to define a surface for receiving a tensed foil shadow mask. The surface contains a metal portion to which the mask may be welded, and a non-metal portion which supports the metal portion.

Mask support structure for tension mask color cathode ray tubes

A tension mask color cathode ray tube includes a glass faceplate having on its inner surface a centrally disposed, rectangular screening area. A shadow mask support structure located on opposed sides of the screening area has a mask-receiving member embedded therein.

A method of making a mask support structure for a cathode ray tube includes the steps of slowly rotating a quantity of sdolder glass paste in a container continuously over an extended period of time so that its viscosity is significantly below an original value, permitting the rotated solder glass paste to stand substantially still until it returns near its original viscosity value, dispensing the solder glass paste in a metallic mask support rail having a generally hollow cross-section, and securing the rail to a CRT faceplate.

Method for making mask support structure for a tension mask color

A method of making a CRT mask support structure with a faceplate mounted metal alloy rail filled with solder glass, including the step of coating the interior of the rail with a surfactant prior to filling to promote wetting of the rail by the solder paste.

A process is disclosed for use in the manufacture of a color cathode ray tube having a flat faceplate and tensed foil shadow mask. The process comprises providing a trough-like shadow mask support structure for receiving and securing the mask and filling the structure with a devitrifying solder glass paste of relatively low viscosity. The structure is then over-filled with devitrifying solder glass paste of relatively high viscosity. The structure is joined with the faceplate with the plate of relatively high viscosity in contact with the faceplate. The faceplate and the structure is heated to a temperature effective to shrink the solder glass paste into the structure and devitrify the paste to permanently secure the structure to the faceplate.

Growing community of inventors

Elmhurst, IL, United States of America

Raymond G Capek