JPH048604Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention aims to improve the alignment of the optical axis of the image tube and the central axis of the tube container, and the image The present invention relates to an image tube device in which the output surface of the tube and the optical system mounting surface of the tube container can be easily maintained parallel to each other.

(b) Prior art An image tube device used in an X-ray fluoroscopic imaging device is such that an X-ray image intensifier (hereinafter referred to as an image tube) is housed and fixed in a tube container made of aluminum material, and the tube container is An optical system consisting of a lens, a prism, a reflecting mirror, etc., which sends an X-ray fluoroscopic optical image to a television camera, spot camera, cine camera, etc., is attached to the optical system mounting surface of the camera.

Therefore, when placing and fixing the image tube in the tube container, make sure that the optical axis of the image tube and the center axis of the tube container coincide, and that the output surface of the image tube and the optical system mounting surface of the tube container are parallel. must be maintained.

For this purpose, a jig is used that is pre-adjusted to accurately maintain both the alignment between the optical axis of the image tube and the center axis of the tube container, and the parallelism between the output surface of the image tube and the optical system mounting surface of the tube container. Conventionally, the image tube was attached to the output side of the jig, and the image tube was housed and fixed together with the jig in the tube container.

This conventional method will be explained with reference to FIGS. 4 to 6. FIG. 4 is a plan view of the adjustment jig, FIG. 5 is a side view thereof, and FIG. 6 is a side view showing the image tube fixed to the tube container via the adjustment jig attached to it. (However, the tube container is shown in cross section).

This conventional adjustment jig 1 has three parallelism adjustment tools 3 and three central axis alignment tools 4 arranged on a concentric circle on an annular substrate 2. The height of the top surface from the substrate 2 surface can be adjusted by turning a cap-shaped nut screwed into the cap, and the central axis alignment tool 4 is set on the top thereof at an appropriate rotation angle position. An eccentric cam is provided which allows the For adjustment, insert the screws inserted into the jig mounting seats 12 (three in this example) evenly distributed around the output side of the image tube 11 into the mounting holes 13 of the circuit board 2. The jig 1 is placed on the image tube 11 and fixed to the image tube 11 by tightening the cap-shaped nut 5.

The image tube 11 with the adjustment jig 1 attached in this way is mounted on a test stand (not shown),
The X-ray optical output image formed on the output fluorescent surface is projected onto the screen surface via the optical system. In this case, the optical system is attached to the optical system mounting surface 14 of the tube container 13.
It is attached to a reference plate provided at a position corresponding to .

While looking at the projected image on the screen, adjust the cap-shaped nuts of the parallelism adjustment tool 3 so that the output surface of the image tube 11 is parallel to the reference plate of the image tube 11. Correct the spacing and inclination of Incidentally, the reference plate has a round hole drilled therein concentrically with the optical axis of the optical system attached thereto, and at least three reference pins are equally spaced on the circumference concentric with the round hole. has been done. Next, each of the eccentric cams of the central axis alignment tool 4 is rotated, and if necessary, the image tube 11 is traversed by a slight amount with respect to the reference plate surface, so that each of the eccentric cams is brought into contact with the reference pin. The rotation angle position of each eccentric cam is set respectively. In this way, the central axis alignment tool 4 is arranged so that the optical axis of the image tube 11 passes through the center of the circular hole of the reference plate, in other words, the optical axis of the image tube 11 is aligned with the light of the optical system attached to the reference plate. Adjust to match the axis.

Now, as described above, the image tube 11 to which the adjustment jig 1, on which the parallelism adjustment tool 3 and center axis alignment tool 4 have been adjusted on the test stand, is attached is placed in the tube container 13.

The tube container 13 is provided with three abutments 15 corresponding to the parallelism adjustment tool 3 on the inner surface of the optical system mounting surface 14, and these abutting surfaces are parallel to the optical system mounting surface and are parallel to the optical system mounting surface. It is finished so that the distance is equal to the thickness of the reference plate, and three pins 16 are provided at positions corresponding to the reference pins. Further, as shown in FIG. 6, the inner circumferential surface of the end of the body of the tube container 13 has a female thread, and an annular support plate 17 is screwed into this female thread.

Therefore, the image tube 11 is placed together with the adjustment jig 1 in the tube container 13 from which the annular support plate 17 has been removed, and the top surfaces of the cap-shaped nuts of the parallelism adjustment tool 3 abut on the abutments 15, respectively, and the center axis alignment tool 4 eccentric cam hits pin 16
0 ring 1.
8. Apply the annular member 19 to the input surface of the image tube 11, then attach the annular support plate 17, and tighten the set screw 20 to close the image tube 11.
can be fixed to the tube container 13 by aligning its optical axis with the central axis of the tube container 13 and keeping its output surface parallel to the optical system mounting surface 14 of the tube container 13.

However, the conventional method of fitting and fixing the image tube 11 in the tube container 13 described above requires a long time for adjustment, and the adjustment jig incorporated with the image tube 11 is somewhat complicated, which affects the cost. That was the problem.

(c) Purpose The purpose of this invention is to use a simple adjustment tool instead of the adjustment jig described above, and to make adjustment when attaching it to the image tube simple and short. It is an object of the present invention to provide an image tube device capable of performing the following steps.

(D) Structure The image tube device according to this invention has at least two plane parts and an outer peripheral surface that are parallel to each other, and a circular through hole is provided in a direction perpendicular to the plane parts and concentrically with the outer peripheral surface. A circular optical image in which the output side plane of the image tube envelope and the inner plane of the optical system attachment part of the tube vessel are imaged on the output fluorescent surface of the image tube through a bored annular adjustment tool; One plane part of the annular adjustment tool is joined to the output side plane of the image tube envelope so that the circular through hole is located concentrically with the center position of the circular through hole and the axis of the tube vessel. The optical axis of the image tube and the center axis of the tube container are Alignment and parallel maintenance of the output surface of the image tube and the optical system mounting surface of the tube container are performed.

(e) Embodiment FIG. 1 is a side sectional view showing the main parts of an image tube device according to an embodiment of this invention.
1 is shown by the external shape of the glass envelope, and the third
The figure is an enlarged partial side sectional view of FIG.

An annular adjustment tool 21 is fixed to the output side of the envelope of the image tube 11 by adhesive. This annular adjustment tool 21 is made of a plate made of polyoxymethylene resin, such as Delrin (trade name of DuPont), or polytetrafluoroethylene resin, such as Teflon (trade name of Dupont), which is a good electrical insulating material.
Optical system attachment part 14 of tube container 13 made of aluminum material, for example, is processed by cutting.
In FIG. 3, the upper surface that contacts the inner surface of the glass envelope of the image tube 11 and the surface fixed by adhesive to the output side of the glass envelope of the image tube 11 are finished as flat parts parallel to each other, and perpendicular to these flat parts. Inner peripheral surface I
and the outer peripheral surface E are finished concentrically. In addition,
The inner diameter of the inner circumferential surface I is made slightly smaller than the inner diameter of the output window of the tube container 13.

And the annular adjustment tool 21 finished in this way
Apply a resin adhesive (for example, silicone rubber) with good electrical insulation properties to the output side plane of the glass envelope of the image tube 11 so that the center of the inner peripheral surface I is located on the optical axis of the image tube 11. To do this, X-rays are incident on the input surface of the image tube 11 consisting of an input fluorescent surface and a photocathode, and a focusing electrode provided inside the image tube 11,
By adjusting the voltages applied to the auxiliary electrode and the anode, an optical image in which the electron image by the X-rays is formed as a reduced image on the output fluorescent surface is formed so that the diameter thereof is the inner peripheral surface of the annular adjustment tool 21, that is, the circular penetrating surface. The annular adjustment tool 2 is made to be slightly smaller than the inner diameter of the hole I, and the adhesive is applied to the adhesive surface in advance.
1 is placed on the output side plane of the envelope of the image tube 11, and the annular adjustment tool is adjusted so that the optical image is taken into the inner peripheral surface I of the annular adjustment tool 21 while maintaining an equal distance from the inner peripheral surface I. After correcting the mounting position of 21, it is pressed appropriately and fixed at that position. In this case, the output side plane of the envelope of the image tube 11 is
Since the thickness of the glass is made uniform during the manufacturing process, the upper plane part of the annular adjusting tool 21 is parallel to the output fluorescent surface 22 of the image tube 11. On the other hand, for the tube container 13, the inner surface of the optical system mounting part 14 is processed by cutting to make it a flat surface parallel to the optical system mounting plane 14, and the center is located on the central axis of the tube container 13. , the inner peripheral surface is finished so that the inner diameter is equal to the outer diameter of the annular adjustment tool 21. The annular adjustment tool 21 is tightly fitted into the circular recess formed in this manner.

As described above, the image tube 11 to which the annular adjustment tool 21 is fixed is housed in the tube container 13, but in order to do so, the annular support plate 17 is removed and the tube container 13 is placed in the same manner as described for the conventional one. After fitting the annular adjustment tool 21 into the circular recess, apply the O-ring 18 and the annular member 19 to the input surface of the image tube 11, and then attach the annular support plate 1.
7 and tighten the set screw 20.

In an image tube device in which the image tube 11 is housed in the tube container 13 and is fixed in this way, the optical system mounting plane 14 of the tube container 13 is located on the image tube 1.
It is not necessary to explain again that the image tube 11 is held parallel to the output fluorescent surface 22 of the image tube 11, and that the central axis of the tube container 13 and the optical axis of the image tube 11 coincide.

FIG. 2 shows another embodiment in which the image tube 11 has a different shape. In this other embodiment, the portion corresponding to the circular recess into which the annular adjuster 21 is tightly fitted is provided with the inside thereof being finished by cutting, for example, in the same manner as described above. It is formed by doing.

(f) Effects In the image tube device according to this invention,
In order to align the optical axis of the image tube and the central axis of the tube container, and to maintain parallelism between the output surface of the image tube and the optical system mounting surface of the tube container, an annular adjustment tool with a jig shape that is easy to attach to the image tube is used. Moreover, the adjustment when attaching it to the image tube can be done easily and in a short time, which is advantageous in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of an image tube device according to one embodiment of this invention, FIG. 2 is a side sectional view of another embodiment of the image tube device having a different shape, and FIG. 4 is a plan view of the adjustment jig incorporated in the conventional device, FIG. 5 is its side view, and FIG. 6 is the tube container of the conventional device. It is a side view showing only a section. 11...image tube, 13...tube container, 14...
...Optical system mounting part (optical system mounting plane), 21...
...Annular adjustment tool, 22...Output fluorescent surface.

Claims (1)

[Scope of utility model registration request] The outside of the image tube is inserted through an annular adjustment tool that has at least two plane parts and an outer circumferential surface that are parallel to each other, and has a circular through hole bored in a direction perpendicular to the plane parts and concentrically with the outer circumferential surface. Image the output side plane of the enclosure and the inner plane of the optical system attachment part of the tube container so that the circular optical image formed by focusing on the output fluorescent surface of the image tube and the circular through hole are located concentrically. One plane part of the annular adjustment tool is joined to the output side plane of the tube envelope, and the inner plane of the optical system attachment part is aligned so that the center position of the circular through hole and the axis of the tube container coincide. An image tube device fixed by bringing a plane different from the above-mentioned plane of an annular adjustment tool into contact with the image tube device.