Abstract:
In a shadow mask support means comprising a bi-metal piece having one end secured to a shadow mask frame with the other end left free, and a leaf spring secured at one end to said free end of the bi-metal piece and extending therefrom toward a pin provided on a side wall of a face panel, the improvement residing in that a metallic plate portion disposed between said frame and said spring is so arranged that it is displaced due to thermal deflection of the bi-metal at the end adjacent to said pin by an amount smaller than the displacement at the opposite end.
Abstract:
A shadow mask support means including three leaf springs for supporting a rectangular shadow mask on a face panel at three sides of a frame of the mask, said three leaf springs having a predetermined relationship with respect to the spring constant and deflection so that, even when the image tube is subjected to a shock load or the shadow mask in thermally expanded, the change in the relative position of the shadow mask and the face panel is minimized.
Abstract:
An electrostatic focussing-type television picture tube wherein a plurality of ring-shaped metal plates are successively coaxially stacked to form an electrode assembly with the plates being separated, a relatively small space between adjacent plates. This electrode assembly is placed between a first accelerating electrode and a screen, whereby a periodic electric field is produced by the electrode assembly to thereby provide a lens effect of a main lens which is apparently a unitary system and which is moreover substantially free of aberration.