Title: Cathode ray tube having improved shadow mask

Abstract: A cathode-ray tube of the vertical line screen, slit apertures mask type includes a mask wherein the horizontal curvature of the mask is made greater than that suggested by the prior art for similar type tubes. Because of the added curvature, the degree of electron beam misregister caused by mask doming is reduced. To obtain acceptable packing of the screen lines, the horizontal center-to-center spacing between adjacent apertures in the mask are varied in relation to the difference in mask-to-screen spacing with respect to the prior art. The additional mask curvature need not necessarily be in a single arch but also may take the form of parallel extending corrugations in the mask.

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Inventors: Morrell, Albert M. (Lancaster, PA, US)

Application Number: 729592
Filing Date: 1976-10-04
Publication_date: 1979-01-23
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 313/403
Other Classes:
US Patent Ref:

2745978	May, 1956	Van Ormer	313/408.
2937297	May, 1960	Burdick	313/402.
2947899	Aug, 1960	Kaplan	313/408.
3109117	Oct, 1963	Kaplan	313/408.
3226229	Dec, 1965	Kaplan	313/408.
3282691	Nov, 1966	Morrell et al.	96/36.
3435268	Mar, 1969	Rublack	313/408.
3590303	Jun, 1971	Coleclough	313/408.
3721853	Mar, 1973	Naruse et al.	313/402.
3889145	Jun, 1975	Suzuki et al.	313/408.
3944867	Mar, 1976	Kaplan	313/403.

Other Refs: 8670021012729101490511657661249954

May, 1961	GB.
Dec, 1965	GB.
Dec, 1965	GB.
Oct, 1969	GB.
Oct, 1971	GB.

Primary Examiner: Segall, Robert
Assistant Examiner:
Attorney: Whitacre; Eugene M., Bruestle; Glenn H., Irlbeck; Dennis H.