Shadow mask for color cathode ray tube

Details Shadow mask for color cathode ray tube Shadow mask for color cathode ray tube

1989-11-22

1991-07-09

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

313408, 354 1, H01J 2907, G03B 4100

Patent

active

050308807

ABSTRACT:
A shadow mask for a color cathode ray tube is disclosed. The shadow mask has pin cushion type apertures or drum type apertures mixed with slit type apertures. When the shadow mask is used as an exposing mask, the pin cushion type apertures may be provided at the portions where fewer light beams are required, and the drum type apertures may be provided at the portions where more light beams are required. The maximum width of the pin cushion type apertures is preferably about the same as the width of the slit type apertures, while the minimum width of the drum type apertures is preferably about the same as the width of the slit type apertures. According to the disclosed device, the photo sensitivity differences between the exposed portions of the whole panel may be reduced. Thus, the formation of black matrices becomes uniform, thereby enabling the production of high quality cathode ray tubes.

REFERENCES:
patent: 3652895 (1972-03-01), Tsuneta et al.
patent: 4296189 (1981-10-01), Kuzminski

Affiliated with

Also associated with

Rating

Shadow mask for color cathode ray tube does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Shadow mask for color cathode ray tube, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Shadow mask for color cathode ray tube will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-620323