Device for fixing an internal magnetic screen to a frame

Abstract

A cathode ray tube comprising an internal magnetic screen (60) and a frame (40) supporting a shadow mask (3). The screeen is attached to the frame by means of cut-out tabs (63) on the peripheral lip (61) of the screen. The tabs are inserted into openings (62) on the surface of the flange (41) of the frame entering into contact with the screen. Said type of attachment makes it possible to eliminate additional parts and to automatize the attachment of the screen to the frame.

Description

technical field [0001] The present invention relates to a color cathode ray tube having a substantially flat screen, and more particularly to a color selection frame / shadow mask assembly incorporating such a picture tube. [0002] The invention finds application in any type of picture tube comprising a color selection mask, and moreover it is applicable to picture tubes with a shadow mask realized by stamping and to picture tubes with a shadow mask to which it is attached The rigid frame is held in tension within the picture tube. Background technique [0003] Conventional cathode ray tubes consist of a glass envelope within a vacuum. Inside the envelope, the picture tube includes a color selection shadow mask located at a precise distance from the glass panel of the picture tube on which a grid of red, green and blue illuminants is placed to form a phosphor screen. An electron gun is arranged in the rear of the picture tube along the longitudinal axis of the picture tube,...

AI Technical Summary

Problems solved by technology

[0009] The installation method using rivets or welding has the disadvantage that the parts constituting the frame and the screen cannot be reused when a problem occurs with respect to any of the above-mentioned parts; moreover, the installation method using additional metal parts such as clips is expensive in materials and requires manual work operation, which is difficult to automate

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