Image intensifier
View Patent ↗A chromium oxide film is formed so as to continuously connect an anode and a grid electrode, and an insulating member for insulating those electrodes. A chromium oxide film is formed so as to continuously connect a grid electrode and a grid electrode, and an insulating member for insulating those electrodes. With use of the chromium oxide films, no intermittent discharge phenomenon occurs between the insulating member and the anode, and between the insulating member and the grid electrodes.
1. An image intensifier, comprising:
a vacuum envelope having an input window, which is formed in a side thereof on which incident light is incident, and an output window, which is formed in a side thereof opposite to the input window;
an input surface, which is provided on the input window side within the vacuum envelope, and is configured to emit an electron beam corresponding to the incident light;
an output surface, which is provided on the output window side within the vacuum envelope, and is configured to convert the electron beam into a visible light image;
a plurality of electrodes which form an electron lens on a path of the electron beam between the input surface and the output surface;
a plurality of insulating members configured to insulate the plurality of electrodes; and
a chromium oxide film, which is formed to continuously connect the plurality of electrodes and the insulating members located between those electrodes, the formed chromium oxide film configured to prevent an intermittent discharge phenomenon from occurring at an interface between at least the electrodes and the insulating members.
2. The image intensifier according to claim 1 , wherein said plurality of electrodes are an anode, and a grid electrode close to the anode, and the insulating member is made of glass or ceramic.
3. The image intensifier according to claim 1 , wherein a composition ratio of the chromium oxide film is set at 25 to 40 atom % of chromium, 1 to 8 atom % of silicon, 0.7 to 5 atom % of alkali metal, and the remaining part of the composition substantially consisting of oxygen.
4. The image intensifier according to claim 3 , wherein the alkali metal is potassium.
5. The image intensifier according to claim 1 , wherein an average particle diameter of chromium oxide particles in the chromium oxide film is in the range of 0.5 to 1.5 μm.
6. The image intensifier according to claim 1 , wherein a thickness of the chromium oxide film is in the range of 5 to 100 μm.
7. The image intensifier according to claim 2 , wherein a composition ratio of the chromium oxide film is set at 25 to 40 atom % of chromium, 1 to 8 atom % of silicon, 0.7 to 5 atom % of alkali metal, and the remaining part of the composition substantially consisting of oxygen.
8. The image intensifier according to claim 7 , wherein the alkali metal is potassium.
9. The image intensifier according to claim 2 , wherein an average particle diameter of chromium oxide particles in the chromium oxide film is in the range of 0.5 to 1.5 μm.
10. The image intensifier according to claim 2 , wherein a thickness of the chromium oxide film is in the range of 5 to 100 μm.
11. The image intensifier according to claim 3 , wherein an average particle diameter of chromium oxide particles in the chromium oxide film is in the range of 0.5 to 1.5 μm.
12. The image intensifier according to claim 3 , wherein a thickness of the chromium oxide film is in the range of 5 to 100 μm.
13. The image intensifier according to claim 4 , wherein an average particle diameter of chromium oxide particles in the chromium oxide film is in the range of 0.5 to 1.5 μm.
14. The image intensifier according to claim 4 , wherein a thickness of the chromium oxide film is in the range of 5 to 100 μm.
15. The image intensifier according to claim 5 , wherein a thickness of the chromium oxide film is in the range of 5 to 100 μm.