Loading patent…
AssigneeN.V. Optische Industrie "De Oude Delft"
InventorsLambertus K. van Geest, Johannes J. Houtkamp
Estimating the term…
A method of making the cathode of a diode image intensifier tube by evaporating some alkali metals and antimony on to the inner surface of a cathode window which by means of a layer of frit is joined to a metallic cathode flange, and in which there is provided between the cathode and the cathode flange, or, as the case may be, the cathode housing, an electrical resistance of a pre-determined value such that at light levels at which there is a danger of the anode being burnt, the diode image intensifier tube is defocussed or cut off, and wherein prior to the evaporation of the metals an alkali-resistant and insulating layer is applied to the frit layer, and that the evaporation of the antimony is carried out so that there is formed between the cathode and the cathode flange an area extending around the cathode and where no antimony is present, and that at least one galvanic connection is passed vacuum-tight outside the diode image intensifier tube, and one end of said connection is arranged at the place of the cathode to be formed for supplying voltages of a pre-determined magnitude to the cathode during its manufacture and later during operation of the tube.
In a method for making a cathode of a diode image intensifier tube wherein alkali metals and antimony are evaporated onto an inner surface of a cathode window and wherein said cathode window is joined by a layer of frit to a metallic cathode flange coupled to a cathode housing, said diode image intensifier tube having between said cathode window and said metallic cathode flange an annular area of electrical resistance of a predetermined value such that at light levels whereat there is a danger of anode burn out, said diode image intensifier tube is caused to be defocussed or cut off, the improvement characterized by positioning at least one galvanic connector through said diode image intensifier tube and insulated from said metallic cathode flange with one end of said galvanic connector extending out of said diode image intensifier tube and the other end being in contact with said inner surface of said cathode window for supplying voltages of a pre-determined magnitude to said cathode during its manufacture and during operation of said tube.
Dependencies are inferred from the claim text.