Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1995-05-26
1997-01-07
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313402, H01J 2907
Patent
active
055920446
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: 3787939 (1974-01-01), Tomita et al.
patent: 4168450 (1979-09-01), Yamauchi et al.
patent: 4662984 (1987-05-01), Ohtake et al.
patent: 4734615 (1988-03-01), Koike et al.
patent: 4771213 (1988-09-01), Higashinakagawa et al.
patent: 4864188 (1989-09-01), Sugai et al.
Muramatsu Sachiko
Ohtake Yasuhisa
Sago Seiji
Yamazaki Mitsuaki
Kabushiki Kaisha Toshiba
O'Shea Sandra L.
Patel Vip
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