Kabushiki Kaisha Toshiba

Tokyo Shibaura Electric Co., Ltd.

Hidetoshi Yamazaki

Masatsugu Inoue

Michio Nakamura

Takeshi Fujiwara

Kiyoshi Tokita

Tohru Takahashi

Toshinao Sone

Eizaburo Hamano

Hiroshi Urata

Tooru Takahashi

Hidenari Toge

Hisafumi Okada

In a panel for a color cathode ray tube, a faceplate is so formed as to have a substantially rectangular front view and a skirt has four corner sections. Panel pin mount bases are provided on the four corner sections of the skirt, respectively and four panel pins are fixed to the mount base, respectively.

Color cathode ray tube panel with shadow mask supports

A color picture tube having a shadow mask structure with a shadow mask and a mask frame supporting the shadow mask facing a phosphor screen inside a panel comprises a plurality of V-shaped support members, each having a folded portion apart from a sidewall of the mask frame and two arm portions extending from the folded portion. The support members support the shadow mask structure to the panel to control a relative distance beween the phosphor screen and the shadow mask according to thermal expansion of the shadow mask structure or the panel, whereby positions impinged by an electron beam on the phosphor screen remained invariably.

Color picture tube with support members for the mask frame

In a color picture device having a tube envelope and an in-line type electron gun assembly disposed in a neck section of the tube envelope, a deflection unit includes a pair of first deflecting coils for deflecting three electron beams in a horizontal scanning direction coinciding with the in-line arranged direction, and a pair of second deflecting coils for deflecting the electron beams in a vertical scanning direction perpendicular to the horizontal scanning direction. A pair of permanent magnet plates is arranged individually between a funnel section and the second deflecting coils, and adapted to form a deflection magnetic field of a direction opposite to the vertical scanning direction.

Color picture device including convergence correcting magnetic plates

In a color picture tube in which an electron beam produced by an electron gun passes through apertures in a shadow mask structure and excites a phosphor screen, the shadow mask structure comprises a shadow mask having an electron beam penetration area and a frame portion supporting this shadow mask. The shadow mask is formed of a metal of a lower coefficient of thermal expansion than the frame portion. The shadow mask has its periphery bent to form a skirt portion and the skirt portion is fixed by welding to the frame inner wall. The skirt portion is subject to an inward compressive stress from the frame portion, and by means of this stress deformation during the manufacturing process and during operation is prevented.

Color picture tube having a shadow mask mounted under compressive stress

A color picture tube comprises a tube envelope having a tube axis and including a neck section, a funnel section and a panel section, an electron gun assembly for emitting at least three electron beams, and a shadow mask assembly disposed in the tube envelope adjacent to the phosphor screen. The shadow mask assembly includes a shadow mask and a frame. The shadow mask has a plate portion which is formed having a curved surface with a dome-like shape opposing the phosphor screen and regularly arranged apertures each for allowing the three electron beams to pass through, and a skirt portion extending from the peripheral portion of the plate portion along the tube axis. The frame surrounds the peripheral portion of the skirt portion of the shadow mask, and the frame and the skirt portion of the shadow mask are coupled to each other by welding at a plurality of locations. The frame is made of a metal material having a thermal expansion coefficient higher than the shadow mask.

Color television shadow mask assembly

The shadow mask of a color cathode ray tube has a number of apertures in the effective area passed by electron beams to the phosphor screen formed in the inner surface of the panel. The effective area where these apertures are distributed is in the nonspherical configuration adjacent to the phosphor screen surface. When taking the major axis as the X axis, the minor axis as the Y axis and the center of the shadow mask through where the tube axis (the Z axis) passes is made as a point of origin, the line of intersection defined by the plane containing the X axis and Z axis (X-Z plane) and the effective area is formed by the curve positioned as the panel side other than three points of which the circular arc passes in common through both terminal points and the center point on the above line of intersection, against the circular arc.

Color cathode ray tube having a non-spherical curved mask

In a color cathode ray tube with a shadow mask shaped as a nonspherical surface, a structure in which the curved surface shape of the effective area of the shadow mask in which apertures through which electron beams pass to a fluorescent screen are formed is made such that, going along the X axis, minimal values of radius of curvature of lines of intersection of the shadow mask and Y-Z parallel planes parallel to the minor axis Y and a central axis which passes through the mask's center and is normal to the mask exist between the center and the edges of the effective area. This prevents local doming.

Color cathode ray tube

Disclosed is an in-line type color picture tube apparatus which comprises an in-line type color picture tube including a phosphor screen for displaying a substantially rectangular picture with horizontal, vertical, and diagonal axes and an in-line electron gun arranged in parallel with the horizontal axis so as to be allowed to cast electron beams on the phosphor screen to reproduce a color image, a deflection yoke disposed around the outer periphery of the tube and generating such a magnetic field that may give positive isotropic astigmatism to the electron beams when the electron beams are deflected along the horizontal axis, may give negative isotropic astigmatism to the electron beams when the electron beams are deflected along the vertical axis, and may give negative anisotropic astigmatism to the electron beams when the electron beams are deflected along the diagonal axes, and a correction deflection element formed of a plurality of permanent magnets arranged in the vicinity of the end portion of the deflection yoke on the phosphor screen side, generating such a magnetic field that may diagonally constrict the end portions of the diagonal axes of a raster formed of the electron beams by means of an action of the deflection yoke and give positive anisotropic astigmatism to the electron beams when the electron beams are deflected along the diagonal axes. According to this in-line type color picture tube apparatus, raster distortion may be corrected practically completely without using a correction circuit, and self-convergence system may be realized.

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Fukaya, Japan

Hidetoshi Yamazaki