Title:
FACEPLATE ASSEMBLY FOR COLOR CATHODE RAY TUBE AND PROCESS OF SECURING SHADOW MASK SUPPORT STRUCTURE TO THE FACEPLATE OF SAID TUBE
Document Type and Number:
WIPO Patent Application WO1988003326
Kind Code:
A3
Abstract:
An improved front assembly for a color cathode ray tube having a tension foil shadow mask. The faceplate of the tube has on its inner surface a centrally disposed phosphor screen surrounded by a peripheral sealing area adapted to mate with a funnel. A shadow mask support structure (34) is provided for supporting a shadow mask in tension on the structure and spacing the shadow mask from the screen. The support structure includes an undulated member (60) surrounding the phosphor screen which member can take a number of forms including a strip defining a bottom sinuous edge (64) for securing the support structure to the faceplate and a top sinuous edge (62) for securing the shadow mask to the support structure. A cap (68) may be provided for securement to the top sinuous edge of the undulated strip to provide a land for securing the shadow mask to the support structure. Alternatively, the undulated member can be formed with peaks (66a) and valleys (66b) which are flattened in a common plane and provide means for securing the support structure to the faceplate. The peaks are flattened in a common plane and provide means for securing the shadow mask to the support structure. In a further modification, the support member includes an upper, flattened ridge for securing the shadow mask to the support structure. A plurality of legs depend from the ridge and at least a series of the legs is flared outwardly from one side of the ridge to facilitate securing the support structure to the faceplate and to stabilize the support structure under the tension of the shadow mask. Preferably, the mask support structure physically penetrates the faceplate for permanent, cementless anchoring of the structure to the faceplate. The embedment of the mask support structure is of such depth as to cause the structure to resist tensile forces created by the mask. Also disclosed is a process for securing a support structure for a tensed foil shadow mask to a glass faceplate.
Inventors:
FENDLEY JAMES R (US)
STEINER JOHANN (US)
STRAUSS PAUL (US)
GREINER SIEGFRIED M (US)
KRANER JAMES L (US)
STEINER JOHANN (US)
STRAUSS PAUL (US)
GREINER SIEGFRIED M (US)
KRANER JAMES L (US)
Application Number:
PCT/US1987/002869
Publication Date:
June 02, 1988
Filing Date:
October 28, 1987
Export Citation:
Assignee:
ZENITH ELECTRONICS CORP (US)
International Classes:
H01J29/02; H01J29/07; (IPC1-7): H01J29/07
Foreign References:
| GB2000369A | 1979-01-04 | |||
| US3890526A | 1975-06-17 | |||
| US4069567A | 1978-01-24 | |||
| US4100451A | 1978-07-11 |
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