Rca Inc.

Thomson Consumer Electronics Inc.

Rca Licensing Corporation

Thomson Licensing S.a.

Frank R Ragland, Jr

Richard C Bauder

Stephen Thomas Opresko

Richard William Nosker

Ralph J D'Amato

Bruce G Marks

Joey John Michalchuk

Albert M Morrell

Gary Lee Diven

Walter David Masterton

Richard H Godfrey

Andrew Good

George Simon Gadbois

Randall W Martin

A color picture tube comprises an evacuated envelope having an electron gun therein for generating at least one electron beam, a faceplate panel having a luminescent screen with phosphor lines on an interior surface thereof, and a tension focus mask. The mask has spaced apart first metal strands which are adjacent to an effective picture area of the screen and define a plurality of slots substantially parallel to the phosphor lines. Each of the first metal strands across the effective picture area have a substantially continuous insulator layer on a screen-facing side thereof. The mask also includes a plurality of second metal strands oriented substantially perpendicular to the first metal strands. The second metal strands are spaced from the insulator layer when the tube is not energized and are in contact with the insulator layer when the tube is energized.

Color picture tube having metal strands spaced from the insulator layers

An improved color picture tube has a tensioned mask and support frame assembly. Each of the mask and the support frame is rectangular and has two long sides that parallel a central major axis thereof and two short sides that parallel a central minor axis thereof. The improvement comprises the frame including two first members, paralleling the major axis, and two second members, attached to the ends of said first members, paralleling the minor axis. Each of the second members includes a pinched section that elongates it.

Color picture tube having a tensioned mask-support frame assembly

The present invention provides an improvement in a CRT (10) having a tension mask (24) and support frame assembly (35). The support frame assembly (35) is rectangular and has two long sides that parallel a central major axis thereof and two short sides that parallel a central minor axis thereof The mask (24) has a substantially cylindrical contour, being curved along the major axis and straight along the minor axis. The frame assembly (35) includes two first members (36, 38; 136, 138) that parallel the major axis and two second members (40, 42), attached to the ends of the first members, that parallel the minor axis. Each of the first members (36, 38; 136, 138) includes a rigid section (50; 150) and a compliant section (52; 152) cantilevered from the rigid section (50; 150). The compliant sections (52; 152) have a distal end (54; 154) and a proximal end (56; 156). The mask (24) is attached to the distal ends (54; 154) of the compliant sections (52; 152). The improvement comprises at least one of the compliant sections (52; 152) including an alloy portion (60; 160, 161) and a bimetal portion (58; 158) for relaxing the tension on the strands (32) of the mask (24) when subjected to an elevated temperature and restoring the tension on the strands (32) of the mask (24) at a temperature below the elevated temperature.

Color CRT having a support frame assembly with detensioning means

A cathode-ray tube includes a tension mask attached to a rectangular support frame assembly that has two long sides paralleling a central major axis thereof and two short sides paralleling a central minor axis thereof. The frame assembly includes two first members, having oppositely disposed ends, paralleling the major axis, and two resilient U-shaped second members, having a first leg and a second leg attached to the oppositely disposed ends of the first members, paralleling the minor axis. Each of the first members has a compliant portion and a base portion. The mask is attached to the distal ends of the compliant portion. A detensioning rod assembly is disposed between the first and second legs of each of the second members to facilitate varying the tension of the mask.

Cathode-ray tube having detentioning rod assembly for a tension mask

An improved color picture tube includes an evacuated envelope having a rectangular faceplate panel. The panel includes a viewing screen on an inner surface thereof and a shadow mask-frame assembly mounted therein. The shadow mask-frame assembly includes an apertured shadow mask and a peripheral frame to which the mask is attached. The improvement comprises the frame being formed by eight sections, two identical long side sections, two identical short side sections and four corner sections, that are attached together edge-to-edge. The two long side sections and the two short side sections are thinner than the four corner sections.

Color picture tube having improved shadow mask frame

An improved color picture tube includes an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein. The shadow mask assembly includes a shadow mask formed from a first metal having first coefficient of thermal expansion and a frame formed from a second metal having a second coefficient of thermal expansion. The first coefficient of thermal expansion is substantially lower than the second coefficient of thermal expansion. The improvement comprises the shadow mask being interconnected with the frame by a plurality of bimetallic elements, each of the elements having a first end attached to the frame and a second end attached to the mask. Each bimetallic element is formed of materials that cause a bending of the element an amount related to the thermal expansion of the frame.

Color picture tube having an improved shadow mask-to-frame connection

A color picture tube has a tensioned mask and a support frame, each of which is rectangular and has two long sides paralleling a central major axis and two short sides paralleling a central minor axis. The mask is cylindrically contoured, being curved along the major axis and straight along the minor axis. The support frame includes two first members paralleling the major axis and two second members attached to the ends of the first members and paralleling the minor axis. Each of the first members comprises a first part having two flanges, a first flange extending toward the screen and a second flange perpendicular to the first flange, in an L-shaped cross-section. The first flange varies in height along the first part, from a minimum height at the ends thereof to a maximum height at the center thereof. Each of the first members also comprises a second part which extends between the two flanges of the first part and forms a triangle therewith in cross-section.

Color picture having a tensioned mask and compliant support frame

The present invention provides an improvement in a color picture tube having a tensioned mask and support frame assembly. Each of the mask and the support frame is rectangular and has two long sides that parallel a central major axis thereof and two short sides that parallel a central minor axis thereof. The mask has a substantially cylindrical contour, being curved along the major axis and straight along the minor axis. The improvement comprises the frame including two first members that parallel the major axis and two second members, attached to the ends of the first members, that parallel the minor axis. Each of the first members includes a rigid section and a compliant section cantilevered from the rigid section. The mask is attached to the distal ends of the cantilevered compliant sections.

Color picture tube having a tensioned mask and compliant support frame

The present invention provides an improvement in a color picture tube. The tube includes an envelope comprising a faceplate panel, a funnel and a neck. The faceplate panel includes a transparent rectangular faceplate having a cathodoluminescent screen on an interior surface thereof, and a peripheral sidewall. The improvement comprises the faceplate panel having either an interior or exterior blend radius from the faceplate to the sidewall that varies around the periphery of the panel in such a manner that the stresses in predetermined areas of the panel are reduced.

Color picture tube faceplate panel

The present invention is an improvement in a method of screening a line screen slit mask color picture tube that includes coating a faceplate panel of the tube with a photosensitive material, inserting a slit shadow mask into the panel and exposing the photosensitive material by passing light from a line light source through a misregister correction lens and through the slits of the mask. The improvement comprises positioning a skew correction lens between the line light source and the misregister correction lens during exposure of the photosensitive material. The skew correction lens has a surface with a general overall cylindrical shape with deviations from the cylindrical shape being in the four corners of the skew correction lens.

Method for screening line screen slit mask color picture tubes

An improved color picture tube includes an evacuated envelope having a rectangular faceplate panel. The panel includes a viewing screen on an inner surface thereof and a shadow mask assembly mounted therein by support means located at the four corners of the panel. The shadow mask assembly includes an apertured shadow mask and a peripheral frame to which the mask is attached. The frame is formed by four sections that are welded together at their ends. Two of the sections are longer than the other two sections and are constructed of a material having a different coefficient of thermal expansion than that of the other two sections. The frame reduces electron beam misregister with elements of the screen.

Color picture tube with shadow mask-frame assembly

The improved color picture tube includes an evacuated glass envelope having a rectangular faceplate panel with two long sides and two short sides. The panel includes a major axis paralleling the two long sides, a minor axis paralleling the two short sides and two diagonals that extend between opposing corners of the panel. The panel includes a shadow mask assembly mounted therein by support means that are located at the corners of the panel. The support means at each of the spaced positions includes a stud attached to the glass envelope and a spring having an aperture therein engaging the stud. The improvement comprises the studs being located slightly off of the diagonals of the panel between the diagonals and the major axis.

Color picture tube having improved corner support for a shadow

The improved color picture tube includes an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein by support means that are located at peripherally spaced positions within the panel. The support means provide compensation for thermal expansion of the shadow mask assembly. The compensation is a movement of the shadow mask assembly toward a screen of the tube as the shadow mask assembly expands. The support means at each of the spaced positions includes a stud attached to the glass envelope, a spring having an aperture therein engaging the stud, and a plate welded between the spring and the shadow mask assembly. The improvement comprises the combination of the spring being angled with respect to the shadow mask assembly to provide approximately half of the required compensation, and the plate being constructed of bimetallic materials and being of appropriate thickness and length to provide the approximately remaining half of the required compensation.

Color picture tube having improved shadow mask-frame assembly support

An improved color picture tube includes an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein by support means located at peripherally spaced positions within the panel. The support means at each of the spaced positions includes a stud, attached to the glass envelope, and a spring, having an aperture therein that engages the stud. The spring is interconnected with the shadow mask assembly. The improvement comprises the spring including a first portion interconnected with the shadow mask assembly, an elongated second portion extending from the first portion toward the stud, a third portion interconnected with the second portion and including an aperture engaging the stud, and an offset section that positions the center of the aperture on a central longitudinal plane passing through the second portion.

The present invention provides an improvement in color picture tubes including an evacuated glass envelope having a rectangular faceplate panel. The panel includes a shadow mask assembly mounted therein by support means located at peripherally spaced positions within the panel. The support means at each of the spaced positions includes a stud attached to the glass envelope, a spring and a plate. The spring has an aperture therein that engages the stud. The spring is attached to the plate, and the plate is welded to the mask assembly. The improvement comprises the plate being welded to the mask assembly at only one location. This location is on a line, perpendicular to the plate, that passes through the center of the aperture in the spring.

Growing community of inventors

Lancaster, PA, United States of America

Frank R Ragland, Jr