Abstract It is possible to electrophoretically coat cathode shafts with an emissive layer having excellent mechanical properties by means of a device which comprises an electrophoresis bath and a jig which can be dipped therein and in which cathode shafts can be placed, which jig is composed of a plate of insulation material which is provided on the two surfaces with a first and a second electrically conductive layer, said jig having a large number of apertures in each of which a cathode shaft can be provided in a fitting manner such that each cathode shaft electrically contacts the first electrically conductive layer, and the plate is such a thickness that the side of the shaft to be coated is located at a distance from the second conductive layer, which distance is small in relation to the thickness of the jig, which jig is provided at least with a sealing non-electrically conductive layer on the side of the first conductive layer.
Apparatus for electrophoretically coating cathode shafts with an emissive layer, comprising a reservoir containing an electrophoresis bath and a jig which can be dipped therein and in which the cathode shafts can be placed, the jig comprising a plate of electrically insulating material having a given thickness and provided on opposite major surfaces with first and second electrically conductive layers, said jig having a large number of apertures in each of which one of said cathode shafts can be provided in a fitting manner such that each said cathode shaft electrically contacts the first electrically conductive layer, the plate having such a thickness that the surfaces of the shafts to be coated are located within the apertures at a distance from the second conductive layer, which distance is small in relation to the thickness of the plate, and a sealing non-electrically conductive layer on the side of the first conductive layer.
Claim 2
Dependent Claim
151 words
Apparatus for electrophoretically coating cathode shafts with an emissive layer, comprising a reservoir containing an electrophoresis bath and a jig which can be dipped therein and in which the cathode shafts can be placed, the jig comprising a plate of electrically insulating material having a given thickness and provided on opposite major surfaces with first and second electrically conductive layers, said jig having a large number of apertures in each of which one of said cathode shafts can be provided in a fitting manner such that each said cathode shaft electrically contacts the first electrically conductive layer, the plate having such a thickness that the surfaces of the shafts to be coated are located within the apertures at a distance from the second conductive layer, which distance is small in relation to the thickness of the plate, and a sealing non-electrically conductive layer on the side of the first conductive layer.
Claim 3
Dependent Claim
35 words
An apparatus as claimed in claim 1, wherein each aperture near the second cnductive layer has a part having a smaller diameter so that a shoulder is formed against which the cathode shaft is placed.