Color picture tube shadow mask having improved mask aperture pat

Details Color picture tube shadow mask having improved mask aperture pat Color picture tube shadow mask having improved mask aperture pat

1995-11-15

1996-12-10

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313403, 313408, H01J 2980

Patent

active

055833918

ABSTRACT:
A color picture tube has a rectangular shadow mask mounted therein in spaced relation to a viewing screen. A major axis passes through the center of the mask and parallels the long sides thereof and a minor axis passes through the center of the mask and parallels the short sides thereof. The mask has an aperture array that includes slit-shaped apertures aligned in columns that essentially parallel the minor axis and end at a border of the aperture array. Adjacent apertures in each column are separated by tie bars in the mask that are longitudinally offset from column to adjacent column. The spacing from tie bar to tie bar in a column is the tie bar pitch at a location on the mask. A first set of the aperture columns, comprising every other column, has full length ultimate apertures at least at one end thereof, and a second set of the aperture columns, comprising every other column not in the first set, has partial length ultimate apertures at least at one end thereof. The ultimate apertures of all of the aperture columns end on smooth curved border lines. The tie bar pitch of the columns decreases from the center of the mask to the short sides thereof, with the tie bar pitch in the region of the short sides of the mask being optimized to minimize moire at the sides of the screen during tube operation. The tie bar pitch along each column varies also from the center of the mask to the long sides of the mask.

REFERENCES:
patent: 4127791 (1978-11-01), Van Lent
patent: 4631440 (1986-12-01), Robbins
patent: 4727282 (1988-02-01), Tokita et al.
patent: 4973879 (1990-11-01), Fujimura
patent: 4983879 (1991-01-01), Kawaguchi
patent: 5000711 (1991-03-01), Marks et al.
patent: 5030881 (1991-07-01), Marks et al.
patent: 5378959 (1995-01-01), Mancini

Affiliated with

Also associated with

Rating

Color picture tube shadow mask having improved mask aperture pat does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color picture tube shadow mask having improved mask aperture pat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color picture tube shadow mask having improved mask aperture pat will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-425930