Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating
Patent
1989-06-16
1991-09-24
Hoag, Willard E.
Coating processes
Electrical product produced
Fluorescent or phosphorescent base coating
118215, 118244, 118DIG3, 427230, 427429, B05C 706
Patent
active
050512765
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a device that enables the internal graphitization of the surface of the neck in the cone of cathode-ray tubes.
This graphitization operation is aimed at making this internal surface of the neck of the tube conductive to carry it to the same potential (25 Kv) as that of the grid which is in contact with the element commonly called a "top shield cup".
This operation is delicate because, for reasons of operation of the tube, the maximum height of the graphitization in the neck is a vital parameter. Furthermore, the thickness of the graphite layer deposited should be uniform.
For these reasons, the graphitization operations done by hand are not reliable and are increasingly performed by means of automatic machines. Apart from their ability to adjust the height of the graphitization inside the neck, these machines have to be adapted to the cathode-ray tubes according their deflection angle, namely 90.degree. or 110.degree..
The present invention has precisely the object of resolving all of these problems, and concerns a device for the graphitization of the neck of a cathode-ray tube cone fitted out with means that make it capable of receiving all types of tubes, irrespectively of their deflection angle, said means working together with the graphitization means proper in such a way that said graphitization is done on a well-determined height of the internal surface of the neck, and is done homogeneously.
It concerns, more precisely, a device for the graphitization of the neck in cathode-ray tube cones on a height determined by a plane (Lg); characterized in that it comprises, mounted rotationally on one and the same frame (110), two arms each fitted out with a collar, the profile of which can be adapted to the deflection angles of the cathode-ray tubes, said collars working together with a supporting table capable of being translated in a vertical plane and provided with means for centering the base of the cone in a horizontal plane to, on the one hand, center the neck of the cone along its axis (xx) and, on the other hand, determine a plane acting as a reference plane (Lr) for the graphitization operation, of the neck over a determined length (1) equal to the distance between the planes (Lg) and (Lr).
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be better understood by means of the following explanations and the appended figures, of which:
FIG. 1 is a schematic illustration of a device according to the invention;
FIG. 2 is a diagram illustrating a part of the device of FIG. 1;
FIG. 3 is a top view of the device along the arrow (F) of FIG. 1;
FIGS. 4a and 4b are sections of collars for centering 110.degree. and 90.degree. cone necks;
FIG. 5 is a drawing illustrating a cathode-ray tube, the cone neck of which been coated with graphite by means of the device according to the invention.
For greater clarity, the same elements bear the same references in all the figures.
As shown in the figures which give a schematic view of a device according to the invention, said device essentially consists of:
a frame (110);
a sub-unit (2) formed by a supporting table (4) on which the cone (1) rests, this supporting table (4) being fitted out with a system of stops for centering the cone in a horizontal table, this supporting plane (4) being capable of achieving translational motion in a vertical plane;
first and second arms (7a) and (7b) fitted out respectively with a collar (9a) and (9b) having a supporting face against which the cone (1) abuts during the upward movement of the supporting table (4), said supporting face demarcating a reference line plane (Lr);
a graphitization system (77) proper, the motion of which is, firstly, related to the vertical translational motion of the supporting table (4) and, secondly, guided by means of a groove (21) with a configuration of its profile and a positioning that lead the graphitization brush (24) up to the table (Lg) which is the boundary of the zone of the neck (3) to be graphitized;
a set of jacks, motors, springs, etc., solidly joined to the frame,
REFERENCES:
patent: 2586348 (1952-02-01), Kuebler
patent: 2709414 (1955-05-01), Powell et al.
patent: 3108023 (1963-10-01), Griesemer et al.
patent: 4031597 (1977-06-01), Nubani et al.
patent: 4092444 (1978-05-01), Killichowski
Patent Abstracts of Japan, vol. 10, No. 79 (E-391) (2136) 3-28-86 and JP. A, 60225330 (Toshiba K.K.), Nov. 9, 1985.
Patent Abstracts of Japan, vol. 6, No. 107 (E-113) (985) Jun. 17, 1982 and JP, A, 5738534 (Nippon Denki K.K.) Mar. 3, 1982.
Patent Abstracts of Japan, vol. 3, No. 124 (E-144) Oct. 17, 1979 and JP, A, 54100252 (Sony K.K.) Aug. 7, 1979.
Coughlin Vince J.
Hoag Willard E.
Irlbeck Dennis H.
Tripoli Joseph S.
Videocolor
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