Sony Corporation

Hisao Kume

Takahide Sanma

Minoru Watanabe

Koji Saita

Hiromu Hosokawa

Mitsuhiro Kawase

Yoshiro Horiuchi

Kenichiro Takayanagi

Tokihiro Nishihara

Kenichi Kanehira

Shuichi Kuwajima

Hiroharu Shirasaka

A cathode ray tube apparatus can accurately, easily and automatically correct influences exerted on both of a beam landing drift and an image distortion drift by terrestrial magnetism applied to a cathode ray tube (CRT). A correction current based on an output of a terrestrial magnetism sensor (45) is supplied to a Z-axis correction coil (41) and an X--X axis correction coil (42). A terrestrial magnetism component (B.sub.H cos.theta.) of Z-axis direction is canceled by a correction magnetic flux generated by the Z-axis correction coil (41), and a terrestrial magnetism component (B.sub.H sin.theta.) of X-axis direction is canceled by the X--X axis correction coil (42), whereby a beam landing drift and a image distortion drift are corrected automatically.

Cathode ray tube

The present invention provides a color selecting mechanism for a cathode ray tube in which an enough area of an effective screen area of a color selecting electrode can be ensured. A frame (1) is constituted by a pair of opposite long-side frames (3) and a pair of opposite short-side frames (4). A color selecting electrode (2) is stretched over the upper surfaces (3b) of the long-side frames (3). The frame (1) is formed by the integral molding. The end portions of the upper surfaces (3b) side of the long-side frames (3) are formed into a straight line as if they were cut down. The lower surfaces of connection portions between the long-side frames (3) and the short-side frames (4) are disposed on the same plane. The height of the long-side frames (3) from this plane is formed so as to be higher than the height of the short-side frames (4).

Frame structure of aperture grille with higher long-side frames

Color cathode ray tube

A grid apparatus which has a multiplicity of ribbon-shaped grid elements stretched in tension and attached to a frame which comprises a pair of support bars and a pair of resilient support members. Metallic members which have a larger thermal expansion coefficient than the resilient support members are connected to the reverse surfaces of the resilient support members opposite the side to which the grid-elements are attached. In the grid apparatus during heat treatment, thermal creep of the grid elements is prevented so that the tension of the grid elements will remain high when the normal temperature state is resumed. A method of making such grid apparatus includes an additional heat treatment such as a blackening process after the reduction of the tension applied to the grid elements by the resilient support members and the support bars, hence preventing thermal creep of the grid elements to produce a high-reliability with high tension of the grid elements.

Grid apparatus for a color cathode ray tube which eliminates vibration

A method of manufacturing, and the structure of an improved electron beam selection electrode of a color cathode ray tube having a pair of arm members with a plurality of grid elements attached thereto and extended therebetween, and a pair of supporting members for the pair of arm members. The method comprises the steps of arranging a damper wire of predetermined length between a pair of fixing members, covering each end of the damper wire arranged on each end of the pair of fixing members with a pair of thin film tapes, respectively, welding both of the damper wire and the thin film tapes thereon to each one end of the pair of fixing members to provide a damper assembly, arranging a wire portion of the damper assembly over a surface of the plurality of the grid elements, and fixing each of the other end of the pair of fixing members to each of the pair of supporting members so as to suppress mechanical vibration of the grid elements.

Method for manufacturing an electron beam selection electrode

A grid apparatus for use with a color cathode ray tube is described, having a pair of opposing frame members, and a pair of arm portions respectively welded at free ends thereof to the pair of opposing frame members for mechanically connecting the pair of opposing frame members, and for stretching the grid elements with a predetermined tension in cooperation with the pair of opposing frame members, in which each of the pair of arm portions is curved generally as a U-shape in substantially one plane. Both ends of the arm portions are respectively connected to the pair of opposing frame members at positions outside from their Bessel points, and the plane in which each of the pair of arm portions is arranged to respectively widened rearward with an angle from 45.degree. to 65.degree. with respect to a surface perpendicular to an axis of the grid apparatus.

Growing community of inventors

Kanagawa, Japan

Hisao Kume