Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Patent
1979-12-10
1981-11-10
Krawczewicz, Stanley T.
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
313404, 313406, H01J 2980
Patent
active
043000711
ABSTRACT:
An improved low-cost mask-faceplate assembly for a shadow-mask-type color cathode ray tube is disclosed. The assembly comprises a glass faceplate having a dished central section and a rearwardly extending flange. A substantially rectangular, frameless shadow mask has a dished perforate central section and rearwardly extending skirt. The mask is relatively stiff about its major and minor axes, but torsionally flexible and unstable with respect to its diagonals. The mask has an integral rim extending radially outward from the edge of the mask skirt to serve as an electron beam shield and to provide added stiffness for the mask. A corner mask suspension system consists of four suspension devices, one at each corner of the mask. Each device comprises a stud affixed to the faceplate flange and arranged to extend radially inwardly along the diagonal of the faceplate. A leaf spring is provided for detachably inter-connecting the mask corner to the stud. Means are provided for mounting the spring on the mask diagonal and normal to the diagonal so that the spring extends rearwardly away from the central section of the faceplate, and such that when the spring is deflected, the distal end thereof travels on an arc inwardly toward the faceplate central axis. As a result, the mask, which is low in cost but inherently lacking in self-rigidity and stability due to its one-piece frameless construction, is suspended with high rigidity derived from the faceplate and with high stability derived from the four-corner mounting. Further, the rearwardly extending springs have their distal ends readily accessible for facile insertion and removal of the mask from the faceplate.
REFERENCES:
patent: 2922063 (1960-01-01), Haas
patent: 2961560 (1960-11-01), Fyler
patent: 3450920 (1969-06-01), Engels et al.
patent: 3487251 (1969-12-01), Barten et al.
patent: 3497746 (1970-02-01), Duistermaat et al.
patent: 3529199 (1970-09-01), Duistermaat et al.
patent: 3548235 (1970-12-01), Driedijk et al.
patent: 3553517 (1971-01-01), DeBernardis
patent: 3588568 (1971-06-01), Sohn
patent: 3803436 (1974-04-01), Morrell
patent: 3943399 (1976-03-01), Sedivy
patent: 3986071 (1976-10-01), Groot
patent: 3986072 (1976-10-01), Adamski
patent: 3999098 (1976-12-01), Dougherty
patent: 4100451 (1978-07-01), Palac
Dougherty Lawrence W.
Palac Kazimir
Clarke, Jr. Ralph E.
Krawczewicz Stanley T.
Zenith Radio Corporation
LandOfFree
Four-corner shadow mask suspension system for television cathode does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Four-corner shadow mask suspension system for television cathode, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Four-corner shadow mask suspension system for television cathode will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2364203