Package structure for mounting a field emitting device in an electron gun
View Patent ↗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.
1. A method for making a field-emitting cathode assembly, comprising:
providing a non-conductive substrate, the substrate having a first and a second surface, and a first conductive pin electrically connected to the first surfaced and extending from the second surface
providing a field-emitting device having an emitting array and attaching the device to the first surface and electrically connecting the device to the first conductive pin;
electrically connecting at least one electrode of the field-emitting device to a second conductive pin, the second conductive pin extending from the second surface;
providing an alignment member having a least one aperture therein and a selected diameter;
providing a spacer to place the alignment member at a selected distance from the substrate; and
joining the substrate and alignment member at a selected spaced-apart distance.
2. The method of claim 1 wherein the method of joining is selected from the methods of welding, brazing and applying adhesive.
3. The method of claim 1 wherein the alignment member is a disk and the disk further comprises a cylindrical side therein.
4. The method of claim 1 wherein the alignment member is a can.
5. A method for assembling an electron gun, comprising:
providing a field-emitting cathode assembly having an alignment member, the alignment member having at least one aperture having a first diameter;
providing a lens to be a part of the electron gun, the lens having an aperture having a second diameter, wherein the first diameter is equal to or less than the second diameter;
providing an aligning tool adapted to fit in the aperture of the alignment member and the lens; and
placing the aligning tool in the apertures of the alignment member and the lens so as to align the apertures and placing a shim between the alignment member and the lens so as to provide a selected distance therebetween; and
glass beading the field-emitting cathode assembly and the lens.
6. The method of claim 5 wherein the alignment member is a can, the can further comprising wings attached thereto produce the first diameter.
7. The method of claim 5 wherein the aperture of the alignment member and the aperture of the lens are substantially centered within the alignment member and the lens, resepectively.