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Package structure for mounting a field emitting device in an electron gun

Imported: 23 Feb '17 | Published: 22 Oct '02

Randolph V. Schueller, Kent R. Kalar, Anthony A. Kloba

USPTO - Utility Patents

Abstract

Apparatus and method are provided for a package structure that enables mounting of a field-emitting cathode into an electron gun. A non-conducting substrate has the cathode attached and the cathode is electrically connected to a pin through the substrate. Other pins are electrically connected to electrodes integral with the cathode. Three cathodes may be mounted on a die flag region to form an electron gun suitable for color CRTs. Accurate alignment of an emitter array to the apertures in the electron gun and other electrodes such as a focusing lens is achieved. The single package design may be used for many gun sizes. Assembly and attachment of the emitter array to the electron gun during construction of the gun can lower cost of construction.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

For a more complete understanding of the present invention and the advantages thereof, reference is now made to the following description taken in conjunction, with the accompanying drawings in which like reference numbers indicate like features and wherein:

FIG. 1

a shows a cross-section view of one embodiment of a cathode structure for an electron gun.

FIG. 1

b shows a cross-section view of a second embodiment of a cathode structure for an electron gun.

FIG. 1

c shows a cross-section view of a third embodiment of a cathode structure for an electron gun.

FIG. 2 shows a cross-section view of a fourth embodiment of a cathode structure for an electron gun.

FIG. 3 shows an aligning tool being used for alignment of a cathode structure and an electrode.

FIG. 4 shows glass beading of a cathode structure and an electrode.

FIG. 5 shows a top view of the single cathode and electrical connections on a substrate that is shown in cross-section in FIG. 1

a, but with the top disk removed.

FIG. 6 shows a top view of three cathodes and electrical connections on a substrate.

FIG. 7 shows a top view of one embodiment of an alignment disk for a three-cathode structure.

FIG. 8 shows a cross-section view of one embodiment of the three-cathode structure shown in FIG.

7.

Claims

1. An electron gun cathode assembly having a field-emitting device, comprising:

2. The electron gun cathode assembly of claim 1 wherein the non-conductive substrate is a ceramic.

3. The electron gun cathode assembly of claim 1 wherein the field emitting device is carbon-based.

4. The electron gun cathode assembly of claim 1 wherein the field-emitting device is electrically connected to a conductive region on the substrate by an electrically conductive adhesive, the conductive region being further electrically connected to at least one pin extending from the second surface of the substrate.

5. The electron gun cathode assembly of claim 1 wherein the electrical, contact on the first surface is a bond pad.

6. The electron gun cathode assembly of claim 1 wherein the alignment member is a disk having a selected diameter.

7. The alignment member of claim 6 wherein the disk further comprises a cylindrical side therein.

8. The electron gun cathode assembly of claim 1 wherein the selected distance between the array and the aperture is provided by use of a spacing ring between the non-conductive substrate and the alignment member.

9. The electron gun cathode assembly of claim 1 wherein the alignment member is a cylinder-shaped can having a selected diameter and an end.

10. The can of claim 9 further comprising an area in the end adapted to position the aperture at a selected location with respect to the emitting array.

11. The electron gun cathode assembly of claim 1 wherein the selected distance is in the range from about 0.1 mm to about 10 mm.

12. The electron gun cathode assembly of claim 1 wherein the selected distance is selected to focus an electron beam from the emitting array.

13. An electron gun cathode assembly having three field-emitting devices, comprising:

14. The electron gun cathode assembly of claim 13 wherein the non-conductive substrate is a ceramic.

15. The electron gun cathode assembly of claim 13 wherein the field emitting devices are carbon-based.

16. The electron gun cathode assembly of claim 13 wherein the devices are electrically connected to a conductive region on the substrate by an electrically conductive adhesive, the conductive region being further electrically connected to at least one pin extending from the second surface.

17. The electron gun cathode assembly of claim 13, wherein the selected distance is in the range from about 0.1 mm to about 10 mm.

18. The electron gun cathode assembly of claim 13 wherein the selected distance is selected to focus an electron beam from each of the emitting arrays.

19. The electron gun cathode assembly of claim 13 wherein the non-conductive substrate further comprises a die flag region on the first surface.

20. The electron gun of claim 13 wherein the alignment member is a disk having a selected diameter.

21. The alignment member of claim 20 wherein the disk further comprises cylindrical sides therein.

22. The electron gun cathode assembly of claim 13 wherein the spacing between the arrays and the apertures is provided by use of at least one spacing ring between the non-conductive substrate and the alignment member.

23. The electron gun cathode assembly of claim 13 wherein the alignment member is a cylinder-shaped can having a selected diameter and an end.

24. The electron gun cathode assembly of claim 23 further comprising areas in the end adapted to position the apertures at a selected location with respect to the emitting arrays.