Composite shiftable aperture mask

Details Composite shiftable aperture mask Composite shiftable aperture mask

1995-03-13

1997-11-11

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313407, H01S 2980

Patent

active

056867840

ABSTRACT:
A composite shadow mask for a cathode ray tube or the like having a first shadow mask and a second support shadow mask shiftably positioned with respect to each other, with the first shadow mask made of a first material of a first thickness with the first shadow mask having a first set of openings therein, and a second shadow mask made of a second material of a second thickness, with the second shadow mask having a second set of openings so that when the first shadow mask is placed in surface-to-surface contact with the second shadow mask, the first set of openings and the second set of openings are in register with one another to thereby permit passage of an electron beam to be defined by openings in the first shadow mask even though the masks can shift with respect to each other during use.

REFERENCES:
patent: 3909656 (1975-09-01), Stachniak
patent: 4629932 (1986-12-01), Tokita
patent: 4996458 (1991-02-01), Hattori
patent: 5079477 (1992-01-01), Yamamoto
patent: 5382870 (1995-01-01), Thoms
patent: 5416377 (1995-05-01), Kim
New Riverside University Dictionary Copyright 1984, by Houghton Mifflin Company.

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