Color cathode ray tube and method of manufacturing shadow mask

Details Color cathode ray tube and method of manufacturing shadow mask Color cathode ray tube and method of manufacturing shadow mask

1996-10-23

1998-11-03

Powell, William

Etching a substrate: processes

Forming or treating mask used for its nonetching function

216 41, 216 56, B44C 122

Patent

active

058303731

ABSTRACT:
A color cathode ray tube has a face panel, a phosphor screen formed on an inner surface of the face panel, an electron gun for emitting electron beams toward the phosphor screen, and a shadow mask arranged between the electron gun and the face panel to oppose the phosphor screen. The shadow mask has a large number of electron beam apertures through which the electron beams pass. Each of the electron beam apertures has a small opening open to a first surface of the shadow mask and a large opening open to a second surface of the shadow mask and communicating with the small opening. The large opening has a center axis and a diameter larger than that of the small opening. A wall surface of the shadow mask which defines the large opening of each of the electron beam apertures located at a peripheral portion of the shadow mask includes a bulged portion. The bulged portion is located on the opposite side of a mask center with respect to the center axis of the large opening, and is bulged outward in the radial direction.

REFERENCES:
patent: 3179543 (1965-04-01), Marcelis
patent: 3787939 (1974-01-01), Tomita et al.
patent: 3929532 (1975-12-01), Kuzminski
patent: 4168450 (1979-09-01), Yamauchi et al.
patent: 4771213 (1988-09-01), Higashinakagawa et al.

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