Structure of slot feature for shadow mask

Details Structure of slot feature for shadow mask Structure of slot feature for shadow mask

2005-04-12

2005-04-12

Williams, Joseph (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S402000, C313S407000, C313S408000

Reexamination Certificate

active

06879092

ABSTRACT:
A structure of a slot feature for a shadow mask in which, on the assumption that the width at the point of ½ in a vertical direction in the feature of slots of the shadow mask is ‘Sw’, horizontal distances from a virtual vertical line passing an apex of a concave portion of a slot at a marginal portion to a protrusion portion formed at both upper and lower sides on the basis of the width Sw line are ‘M’ and ‘N’, and angles inclined in the direction of the protrusion portion from the virtual straight line passing the apex of the curved protrusion portion formed at the opposite side of the concave portion are ‘P’ and ‘Q’, there are at least one and more mask slot satisfying a formula of M>0, N>0, P>0°, Q>0°. The shape of electron beams by positions on the screen are identical to each other, and the shape of electron beam at the left and right sides of marginal portion can be maintained in a straight line in the vertical direction. Accordingly, a purity margin of the electron beam can be increased and brightness characteristics can be improved, and thus, a quality of color reproduction can be heightened.

REFERENCES:
patent: 5280215 (1994-01-01), Ohtake et al.
patent: 5411822 (1995-05-01), Ohtake et al.
patent: 6313574 (2001-11-01), Banno et al.
patent: 6356010 (2002-03-01), Nakamura
patent: 02-086027 (1990-03-01), None

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