Slot-type shadow mask

Details Slot-type shadow mask Slot-type shadow mask

1997-03-19

1999-03-02

Patel, Ashok

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, H01J 2907

Patent

active

058775862

ABSTRACT:
A slot-type shadow mask is provided, which enables one to avoid the problem termed the "phosphor-stripe loss" to thereby improve the quality. This shadow mask includes a plate-like body having slots for selectively allowing electron beams to pass through the mask. The slots are located in a rectangular slot area of the body. Each of the slots has a vertically elongated shape. The slots are arranged horizontally at a specific horizontal pitch and vertically at a specific vertical pitch. The slots form first to m-th slot columns, where m is a natural number. A part of the slots included in the first slot column and a part of the slots included in the m-th slot column have a first width. A part of the slots included in the second slot column and a part of the slots included in the (m-1)-th slot column have a second width. The remaining slots have a third width. The first width is smaller than the third width and the second width is larger than the third width.

REFERENCES:
patent: 3652895 (1972-03-01), Tsuneda et al.
patent: 5030880 (1991-07-01), An

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