Color display tube having heavy metal coating on color selection

Details Color display tube having heavy metal coating on color selection Color display tube having heavy metal coating on color selection

1981-07-10

1984-04-10

Laroche, Eugene R.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, 313423, 445 47, H01J 2907

Patent

active

044423764

ABSTRACT:
The invention relates to a color display tube having a shadow mask (12) positioned in front of a display screen (8). The shadow mask (12) is coated at least on the side remote from the display screen with a heavy metal layer (14) of selectively varied thickness. The heavy metal has an atomic number exceeding 70 and has a high electron reflection coefficient, thus minimizing energy absorbed by the shadow mask from electrons impinging on the mask. Because of the selectively-varied thickness of the layer, reflection of electrons intercepted by the mask toward the screen is minimized without sacrificing the reduction in thermal expansion of the mask afforded by such a reflective layer.

REFERENCES:
patent: 2942130 (1960-06-01), Sheldon
patent: 3562518 (1971-02-01), Javorik et al.
patent: 4339687 (1982-07-01), Redington

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