US2372901A

US2372901A - Cathode ray tube plate assembly

Info

Publication number: US2372901A
Application number: US450116A
Authority: US
Inventors: Stanley J Koch; Robert E Rutherford
Original assignee: Allen B du Mont Laboratories Inc
Current assignee: Allen B du Mont Laboratories Inc
Priority date: 1942-07-08
Filing date: 1942-07-08
Publication date: 1945-04-03
Anticipated expiration: 1962-04-03
Also published as: BE460347A; FR938190A; GB565374A

Description

April 3, 1945.

S; J. KOCH ETAL CATHODE RAY TUBE PLATE ASSEMBLY I Filed July 8, 1942 Patented Apr. 3, 1945 CATHODE RAY TUBE PLATE ASSEBIBLY Stanley J. Koch, Clifton, and Robert E..-Rutherford, Rutherford, N. J assignors to Allen B. Du Mont Laboratories, Inc., Passaic, N. J., a. corporation of Delaware Application July 8, 1942, Serial No. 450,116

Claims.

This invention relates to the assembly of the pairs of deflection plates of cathode ray tubes in such a way that the danger of the pairs of plates becoming displaced with respect to each other is greatly decreased or entirely eliminated.

Heretofore such plates have been attached along their lower edges to the upper ends of wires which passed through a mica disc having eyelets to which the wires were attached. The

upper pair of plates were spaced a considerable distance from the disc support, thus incurring the hazard of the pairs of plates becoming displaced with respect to each other with resulting distortion of the cathode ray beamand producing a misleading trace on the face of the tube.

It is highly important that the pairs of plates should be kept exactly at right angles to each other for accuracy of readings. This object is accomplished by this invention by having all of the wires pass through two holders in the form i of discs located on opposite sides of one of said pairs of plates and having one set of wires passing through this pair of plates and attached thereto. The upper pair of plates is fixedly mounted with respect to the upper disc and the other pair is fixedly mounted on wires that pass through the plates and through both discs so that the upper disc and pair of plates are restrained from' turning circumferentially, and even if they should be turned the disc would carry along the other wires to which the other pair of plates is attached so that the pairs would still maintain practically their right angle relationship to each other.

The invention may be understood from the description in connection with the accompanying drawings, in which:

Fig. 1 is a plan view of the device;

Fig. 2 is a side view thereof; and

Fig. 3 is a side View taken at right angles to Fig. 2.

In the drawing, reference character I indicates a pair of deflecting plates for the cathode ray, and character 2 indicates a second pair that is located at right angles to the first pair. Mica

discs

3 and 4 are spaced apart, and each is pro-'- vided with a number of holes with eyelets 5 anchored therein through which wires or rods 6 and I extend and are soldered or otherwise attached to the eyelets. The four wires 6 support the plates I, and the four wires 1 support the plates 2, two wires supporting each plate at some distance from the centers thereof in the usual way. Narrow strips 8 are provided along the lower outer edges of the plates I and are bent around the wires 6 and are attached both to the wires and the plate by soldering or any other convenient way. Similar strips 9 extend along the lower edges of the plates 2 and are attached thereto and to the wires 1 in a similar way. Elongated openings H] are provided through the outwardly extending portions of the plates 2 through which the wires 1 pass.

The extensions H are provided on the

discs

3 and 4 and have holes l2 therethrough for the purpose of locating thin strips of mica or mica and steel so that the ends thereof rest against the inside wall of the neck of the tube in which the plates are installed so as to keep the same accurately centered in the usual way.

In view of the fact that the wires 1 which support the plates 2 are anchored in the

discs

3 and 4 both below and above these plates, and these wires are spaced a considerable distance apart longitudinally of the plates 2, and the wires 6 also pass through both of these

discs

3 and 4 and are anchored thereto and also keep the plates l in position, the pairs of plates I and 2 are kept permanently at right angles to each other after they have once been adjusted.

What is claimed is: 1. A support for pairs of cathode ray deflection plates, comprising sets of wires anchored in place above and below one of said pairs of plates, one set of said wires passing through the deflecting surface of one of said pairs of plates and supporting it.

2. A support for pairs of cathode ray deflection plates, comprising sets of wires, discs on opposite sides of one of said pairs of plates anchoring said wires in place above and below one of said pairs of plates, one set of said wires passing through the deflecting surfaces of one of said pairs of plates and supporting it and the other set terminating near the lower edge of the other pair of plates and supporting the pair.

3. A support for pairs of cathode ray deflection plates, comprising sets of wires with two pairs of wires in each set anchored in place above and below one of said pairs of plates, each plate having a portion parallel to and attached to a pair of said wires and a portion lying at an angle to said pair of wires, said pair of wires extending in a plane which cuts across said last named portion.

4. A support for two pairs of cathode ray tube deflection plates, comprising wires and two discs of insulating material, said discs being located near opposite edges of one of said pairs of plates, and one of said discs being located between said pairs of plates.

5. The device of claim 4, in which .the wires supporting one pair of plates pass through said plates.

STANLEY J. KOCH. ROBERT E. RUTHERFORD.