JPH03280339A - Image intensifier - Google Patents

Abstract

PURPOSE:To keep the location accuracy in assembling an electrode for an electron lens and an anode by using a plurality of flange-equipped Kovar rings, allowing them to be in direct contact from the inner wall of a vacuum vessel, and securing one electrode by a fixing means to each flange. CONSTITUTION:Electrodes 11, 12 are provided with mouth ring through the inner wall of a vacuum vessel 1, while the anode 10 is directly connected with flange-equipped Kovar rings, 2, 3, 4. These Kovar rings 2, 3, 4 having flanges 2a, 3a, 4a are connected with the inner wall of the vacuum tube 1, and a fixation screw stopper 5b set eccentric by a screw 5a is brought in such a way as pinching these flanges. The screw stopper 5b is with eccentric screw hole, and its longitudinal portion contacts the root of each flange of the Kovar ring due to rotation, and further rotating is checked to achieve fixation. At this time the flanges 2a, 3a, 4a supporting pieces 11a, 12a, 10a or the extension part of each electrode are pinched by each fixation screw stopper 5b and are fitted to cause stopping in place.

Description

[Detailed description of the invention] (b) Industrial application fields INDUSTRIAL APPLICATION This invention is utilized in the field of a photoelectron amplifier tube.

The present invention relates to an image intensifier, and more particularly to an improved support structure for an intermediate electrode and an output anode electrode of an electron lens.

(b) The general schematic configuration of a conventional image intensifier is as illustrated in FIG. 9, which includes a substantially cylindrical glass vacuum container 1 and a photoelectron formed on one side of the container. An input-side cathode photocathode 6, an output-side phosphor screen 13 in the anode 10 formed on the bottom of the container on the other side, and an intermediate electrode 11.11 supported in the container that accelerates and focuses emitted photoelectrons.
The output phosphor screen 13 converts accelerated and focused photoelectrons into visible light.

As in this illustrated example, a plurality of electrodes 12.
11, as shown in FIGS. 10 and 11, screw the electrode 12 or auxiliary anode to the copper ring 2' or copper ring 2 made from a glass tube, and then attach the electrode 11 of the electron lens to the ceramic 15. Fixed via.

In particular, although not shown, the support ceramic 15 has metal screws brazed to both ends thereof, and a nut is attached to the other electrode, and both are screwed together.

In addition, in the past, the electrode was fixed by spot welding to another support piece, etc., and the support piece had a long opening.
It was screwed into the pulp using rod screws or screw-sized open rods. In this case, it is necessary to use an assembly jig to achieve concentricity.

(c) Problems to be Solved by the Invention Regarding the use of ceramic, when creating a photocathode on the input surface, a photocathode is also formed on the ceramic surface, and the electrode 11.
The potential difference between the tubes 12 may cause discharge, making it impossible to ensure the performance of the tube itself.

Furthermore, ceramics have low strength and may break during or after assembly, resulting in waste.

Furthermore, since the ceramic rod has a small contact surface and is fastened to the electrode with a screw through a hole, it is difficult to assemble the electrode with precision, which affects the performance of the tube itself.

Regarding spot welding, sparks generate dust during assembly, which falls off and becomes dust. Also, using a jig for centering during assembly is inefficient.

The object of the present invention is to provide a method for assembling electrodes for anodes and electron lenses in a vacuum container without using ceramic support pieces, which have the drawbacks mentioned above, and without using spot welding, which has other drawbacks. The object of the present invention is to provide an image intensifier that maintains positional accuracy during and after the image intensifier.

(d) Means for Solving the Problems The above-mentioned object consists of a substantially cylindrical glass vacuum container, an input side cathode photocathode for emitting photoelectrons formed on one side of the container, and an input side cathode photocathode formed on the bottom surface of the other side of the container. It consists of an output-side phosphor screen inside the anode, and an electron lens on the intermediate electrode supported in a container that accelerates and focuses the emitted photoelectrons, and the output phosphor screen converts the accelerated and focused photoelectrons into visible light. - In the intensifier, by providing a plurality of flanged copper rings connected through the inner wall of the glass vacuum container, and respective fixing means that directly support the anode and the intermediate electrode via these flanges. , achieved.

(e) A plurality of copper rings with working flanges are used, these are connected directly from the inner wall of the vacuum container, and each electrode is fixedly supported by a fixing means such as a screw for each of the flanges.

In addition, in order to achieve assembly position accuracy, the collar of each copper ring is fitted and held between the support piece of the electrode and the fixing nut.

(f) Example A preferred embodiment of the invention will be explained based on the drawings.

FIG. 1 is a schematic half-sectional view showing the first embodiment.

The image intensifier shown here is the 9th
Similar to what is shown in the figure, a vacuum vessel l, an input window 7, an input surface 6, several electrodes 11, 12, an anode or anode 1
0. Consisting of an output surface 13, via the inner wall of the vacuum vessel 1,
The electrode 11.12 is provided with a solar ring, while the anode 10 is directly connected to a flange copper ring 2.3.4.

Details of the fixing part of each electrode 11, 12, 10 are shown in Figures 2 and 3.
and FIG. 4, respectively.

Each copper ring 2.3.4 having flanges 2a, 3a, and 4a is connected to the inner wall of the vacuum tube 1, and an eccentric fixing screw 5b is inserted into the screw 5a so as to sandwich these flanges.

The fixing screw 5b has an eccentric screw hole (the sixth
As the longitudinal portion rotates, each collar of the copper ring hits the root (see Figure 5), and can be fixed without further rotation. At this time, the extension portion or support piece 11a, 12a, 10a of each electrode is
are held between the fixing screws 5b, and are fitted together to stop at a predetermined position.

The brim of each copper ring was designed to be concentric during manufacture. Further, as shown in FIG. 6, the eccentric fixing screw 5b has a corner on one side to prevent slipping, and a corner on the other side to prevent discharge.

FIG. 7 shows another embodiment, in which the first flange copper ring 3 has its flange facing upward and the electrode 12 is supported by the fixing means shown above, and the second flange copper ring 2 also has a flange. The portion faces upward and supports the electrode 11, is spaced a distance a from the inner surface of the upper part of the bulb, and has a diameter.

The embodiment shown in FIG. 8 differs from the embodiment shown in FIG. 7 in that the second copper ring 2 has a downward facing part and has a diameter E.

In both cases, the distance 1tIa is necessary for withstand voltage and for the contact piece for applying voltage from the terminal to the electrode.
If the brim of the copper ring 2 faces outward as shown in Figure 7,
The diameter of the tube becomes thicker.

As shown in FIG. 8, by turning the collar of the copper ring 2 inward, the diameter E of the tube can be reduced.

[Brief explanation of drawings]

FIG. 1 is a schematic half-sectional view showing one embodiment of the present invention, FIGS. 2, 3, and 4 are views of how each electrode is supported and fixed according to the present invention, and FIG. A right side view, FIG. 6 is a plan view and a front view of the eccentric fixing screw according to the present invention, FIGS. 7 and 8 are schematic half-sectional views showing other embodiments, and FIG. 9 is an image.・An overall schematic cross-sectional view of the intensifier; FIGS. 10 and 11 are schematic half-sectional views showing a conventional example. 1 is glass pulp or a vacuum container, 2, 3 and 4 are copper rings, 5a is an electrode side screw, 5b is an eccentric fixing screw, 6 is an input surface, 7 is an input window, 10 is an anode electrode or anode,
11 is a focusing electrode, and 12 is an auxiliary anode.

Claims (1)

[Claims] 1. A substantially cylindrical glass vacuum container, an input side cathode photocathode formed on one side of the container to emit photoelectrons, an anode output side phosphor screen formed on the bottom of the other side of the container, and emitted photoelectrons. In an image intensifier, the inner wall of the glass vacuum container is An image intensifier characterized in that it comprises a plurality of flanged copper rings connected through the flanges and respective fixing means directly supporting the anode and the intermediate electrode through the flanges.