JPH02226246A - X-ray high speed photographing camera - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an X-ray high-speed photographing camera that continuously photographs X-ray transmitted images formed on the output surface of a photomultiplier tube on a roll film. .

[Prior Art] A conventional high-speed X-ray imaging system will be explained based on FIGS. 5 and 6. FIG. 5 is an overview diagram and is mainly used for imaging cardiovascular organs. A top plate 2 is installed on a bed 1 fixed to the floor so as to be movable in the direction of the arrow, and the subject lies on this top plate 2. The imaging system for taking X-ray images of a subject includes an X-ray tube 4 at one end of an arc-shaped first arm 3, and a photomultiplier tube 5 and an X-ray high-speed imaging camera 6 at the opposite end of the X-ray tube. A first imaging system is formed by being fixed facing toward the second arm 7, and a second imaging system is formed by fixing an X-ray tube 8, a photomultiplier tube 9, and an X-ray imaging camera 10 facing each other at both ends of the second arm 7. It is composed of two photographing systems. In X-ray photography, the brightness of the image transmitted by the subject of X-rays emitted from each X-ray tube 4.8 is amplified by a photomultiplier tube 5.9, and the brightness is amplified by an X-ray high-speed camera 6.10. ~
The film is exposed continuously at a high speed of 90 frames/second. Further, the arms 3.7 are connected to the center of the X-ray tube 4.8 and the photomultiplier tube 5.8 by support mechanisms (not shown).
The device is supported so that a straight line connecting the centers of 9 passes through the part of the subject to be imaged at various angles. By using these two imaging systems, it becomes possible to perform so-called pipeline imaging in which imaging is performed simultaneously from two different directions.

FIG. 6 is a configuration diagram of a high-speed X-ray photography camera, in which a magazine 12 for storing roll film F is detachably attached to a camera body 11 that photographs roll film F one frame at a time via a fixing mechanism. . The magazine 12 stores an unphotographed film Fa and a photographed film Fb at the same time, and the unphotographed film Fa is led to an opening 13 of the camera body 11 along a path indicated by a dashed line and is pressed by a film pressure plate 14. Then, the photomultiplier tube 5.
The image of the subject whose brightness has been amplified in step 9 is focused and recorded on a film F via a lens 15. Photographed film Fb
is sequentially fed one frame at a time by a feeding claw 16 inside the camera body 11, and is finally wound up on a winding shaft 17 inside the magazine 12.

For high-speed X-ray photography, a roll film having perforations is usually used. This film F does not have a leader paper, and in a bright place, film magazine 1
2 cannot be loaded. Therefore, when preparing for photographing, it is necessary to remove the magazine 12 from the camera body 11 and move it into the dark room. First, open the lid of the magazine 12, load the unphotographed film Fa into the supply side, pass the film F along a predetermined path, wrap the leading edge of the film F around the take-up shaft 17, and then close the lid. Then, the magazine 12 is taken out of the darkroom and attached to the camera body 11, and preparation for shooting is completed. Further, even after photographing is completed, the magazine 12 is removed, moved to a darkroom, the lid of the magazine 12 is opened, and the photographed film Fb is developed.

This high-speed X-ray imaging is normally used for imaging rapidly moving cardiovascular organs, etc., and a roll film with a length of 500 to 600 feet is used. In addition, it has traditionally been believed that the faster the shooting speed, the more information can be obtained.
High-speed shooting exceeding 100 frames/second is being carried out.
It often happens that about 500 feet of film are cut off in one scan. However, in recent years, efforts have been made to reduce the radiation exposure of examinees and to save resources in X-ray pre-emissions, and at the same time, improvements in the performance of electron multiplier tubes have led to
Since the amount of information has increased by -60 frames/second, it has become clear that even if high-speed photographing of shadows of about 100 frames/second is performed, the amount of information as expected cannot be obtained. Therefore, recently, the speed of photographing has been decreasing, and photographing at a rate of 30 to 60 frames per second has become mainstream, and a single roll of film is used for multiple inspections.

However, in a conventional high-speed photographing camera as shown in FIG. 6, the unphotographed film Fa and the photographed film Fb are stored in the same magazine 12, and therefore cannot be handled separately. For example, when developing the photographed film Fb after the first photographing is completed, the unphotographed film Fa must also be transported at the same time, and further steps such as separating the unphotographed film Fa and the photographed film Fb must be carried out. It comes with complications. In addition, in order to take a second photograph during this period, a new film must be used, and there is a drawback that a half-finished film is left in the magazine 12 and a plurality of films remain.

Therefore, in order to solve the above-mentioned drawbacks, the patent application No. 63-
No. 236152 discloses an X-ray high-speed imaging camera that divides the film magazine into a supply magazine and a take-up magazine, and is equipped with a film cutting mechanism, making it possible to remove only the take-up magazine containing the film after shooting. is proposed. This high-speed X-ray camera
This will be explained based on FIGS.

FIG. 7 is a configuration diagram of such a high-speed X-ray imaging camera, which includes the camera body 18, supply magazine 19, and take-up magazine 2.
A supply magazine 19 is removably fixed to the camera body 18 by a fixing member (not shown) via a joint surface S1. Further, a take-up magazine 20 is detachably fixed to the supply magazine 19 via a joint surface S2. Camera body 18, supply magazine 1
9. The winding magazine 20 has openings on the joint surfaces S1 and S2, the supply magazine 19 has an opening 21 on the joint surface S1 and an opening 22 on the joint surface S2, and the winding magazine 20
has an opening 23 on the joint surface S2.

The camera body 18 has a condensing lens 24 inside, and is configured to form a transmitted image of X-rays on an opening 25 of the camera body 18 on the cemented surface Sl.

In such a configuration, the supply magazine 1 is first stored in the darkroom.
After passing the unshot film Fa loaded on the winding sprocket 29 through the front surface of the pressure plate 28 via the guide roller 26 and the feeding sprocket 27 as shown by the dotted chain line,
It is guided into the winding magazine 20 through the guide roller 30 and openings 22, 23, and is wound onto the winding shaft 32 via the guide roller 31. Next, this supply magazine 19 is attached to the camera body 18, and preparation for photographing is completed.

FIG. 8 is an enlarged view of the joint between the supply magazine 19 and the take-up magazine 2o, and a film cutting mechanism 33 is provided at the joint of the take-up magazine 2o. FIG. 9 is a plan view of the movable blade provided in the film cutting mechanism 33. On one side of the opening 23 is a fixed blade 34 that is rectangular when viewed from above.
is fixed to the T magazine board 36 with screws 35, and a flat movable blade 37 is arranged in contact with the upper surface of the fixed blade 34. This movable blade 37 has a winding magazine 20.
A rectangular opening 37a is provided so as to overlap the opening 23 of the blade 37.
b is formed obliquely with respect to the fixed blade 34. The movable blade 37 is slidably installed between the T-magazine base 36 and the take-up magazine 20, and is pressed against the fixed blade 34 by a pressing rubber 38 via a pressing member 39.

Further, a rack 40 is attached to the movable blade 37, and this rack 40 meshes with a pinion 41, and when a lever 42 attached to the pinion 41 is rotated in the direction of arrow A,
The movable blade 37 is adapted to slide in the direction of arrow B.

In addition, there are telescopes 43 to 4 for light shielding at the joints of each member.
6 is provided to prevent the photographed film Fb from being exposed.

Figure 10 shows the supply magazine 1 after cutting the film F.
9 is a side view of the joint between the take-up magazine 20 and the first
FIG. 1 is a plan view of the movable blade 37 at that time. As described above, when the lever 42 is rotated in the direction of arrow A, the movable blade 37 moves in the direction of arrow B, working together with the fixed blade 34 to cut the photographed film Fb sandwiched therebetween. Furthermore, after cutting, the movable blade 37 closes the opening 23, so the take-up magazine 20 is sealed, and can be removed from the supply magazine 19 in this state.

Furthermore, when performing the next photographing, the empty take-up magazine 20 is loaded into the supply magazine 21 again. And lever 4
2 is rotated in the force direction of arrow A', the movable blade 37 moves in the direction of arrow B.
'Slide in the length direction and open the opening 23 again. In this state, a film of about 30 cm to 50 cm is fed into the take-up magazine 20 by a film feed mechanism (not shown) provided in the camera body 18, and the leading end of the film F is wound around the take-up shaft 32 to be used as a secondary film. Preparations for shooting are complete.

[Problems to be Solved by the Invention] This conventional high-speed X-ray imaging camera does not allow the film feed mechanism of the camera body to function properly even when the opening of the newly installed take-up magazine is blocked when performing secondary imaging. As the film moves, the film is fed but cannot enter the take-up magazine, and jamming, in which the film is bent at the sprocket in the supply magazine, is likely to occur.

SUMMARY OF THE INVENTION An object of the present invention is to provide an X-ray high-speed photography camera that prevents film jamming by stopping the film feed mechanism when the opening of the take-up magazine is closed.

[Means for Solving the Problems] In order to achieve the above object, the high-speed X-ray imaging camera according to the present invention is a camera that continuously performs X-ray imaging using a roll film, and It consists of a supply magazine that stores film, a take-up magazine that stores photographed film that can be separated from the supply magazine, and a camera body that takes pictures and feeds the film. The present invention is characterized in that it is provided with a detection means for detecting the operating state of the provided light shielding mechanism, and a means for stopping the feeding of the film in response to a signal from the detection means.

[Function] In the X-ray high-speed imaging camera having the above configuration, even if the film feed mechanism is activated, the detection means detects that the film cutting mechanism is in the cutting state, that is, the opening of the winding magazine is closed. If this happens, stop the film feed.

[Example] The present invention will be explained in detail based on the example illustrated in FIGS. 1 to 4. Note that the same reference numerals as in the conventional example indicate the same members.

FIG. 1 is an enlarged view of the joint between the supply magazine 19 and the take-up magazine 20. A T-magazine base 36 having a downward convex portion 47 is attached to the joint portion of the take-up magazine 20 , and this convex portion 47 connects to the concave portion 48 of the supply magazine 19 .
is fitted. A light-shielding maltblen 49 is embedded in this recess 48, and the protrusion 47 crushes it.
The supply magazine 19 and the take-up magazine 20 are held so that no light enters from the joint. In addition, the winding magazine 2
A film cutting mechanism 33 is provided at the joint portion 0.

FIG. 2 shows a movable blade 37 provided in the film cutting mechanism 33.
FIG. A rack 40 is mounted on the movable blade 37, and this rack 40 meshes with a pinion 41 to transmit the rotational force of the lever 42 to the movable blade 37. Further, a contact piece 50 is attached to the side of the rack 40, and a microswitch 52 whose contact point 52a contacts the contact piece 50 is installed on a pinion base 51 fixed to the winding magazine 20.

With this configuration, as shown in FIG. 2, when the film cutting mechanism 33 is not working, that is, when the take-up magazine 20 is open, the movable blade 37 is moving in the direction of arrow B' force. Therefore, the contact piece 50 is in contact with the contact 52a of the microswitch 52. Conversely, when the film cutting mechanism 33 operates as shown in FIG. 3, the moving blade 37 moves in the direction of arrow B.
Since the contact piece 50 is moved in the direction, the contact piece 50 is separated from the microswitch 52. In other words, the micro switch 52
If the film empty feed mechanism installed in the camera body 18 operates only when the camera body 18 is pushed in, the newly installed empty take-up magazine 20 will be in a closed state when performing secondary photography. , it is possible to prevent an accident in which the film F jams.

FIG. 4 shows an example of the configuration of the switch circuit of the film feed mechanism. 01
is input to a motor drive circuit 54 of the film empty feed mechanism, and this drive circuit 54 drives a motor 55.

By using a switch circuit having such a configuration, in the state shown in FIG.
3 is open and the film F can pass through, the signal 01 of the microswitch 52 is turned on, allowing the film to be fed. However, when the opening 23 is closed and the film F cannot pass through, the microswitch 52 is turned on. Since the signal O1 is turned off, empty feeding of the film F is prohibited.

In this embodiment, a case has been described in which the film cutting mechanism 33 is provided in the take-up magazine 20 and the movable blade 37 has both the functions of cutting the film and blocking light. A light-shielding plate having only the function of shielding light from the winding magazine may be provided.

[Effects of the Invention] As explained above, the high-speed X-ray imaging camera according to the present invention operates only when the opening of the take-up magazine is open and the film can pass through. Since it is made to work, it becomes possible to prevent film jamming.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the high-speed X-ray imaging camera according to the present invention, FIG. 1 is an enlarged view of the joint between the supply magazine and the take-up magazine, and FIGS. 2 and 3 are A plan view of the movable blade, Figure 4 is a configuration diagram of the switch circuit, and Figure 5 is a diagram of the switch circuit.
A schematic diagram of a high-speed X-ray imaging system. Figure 6 is a conventional high-speed X-ray camera, Figure 7 is a configuration diagram of a high-speed X-ray camera using a magazine division method, and Figures 8 and 9 are diagrams of a moving blade. A plan view, FIG. 1O is an enlarged view of the joint between the supply magazine and the take-up magazine, and FIG. 11 is a plan view of the movable blade. 18 is a camera body, 19 is a supply magazine, 20 is a take-up magazine, 33 is a film cutting mechanism, 34 is a fixed blade,
37 is a movable blade, 50 is a contact piece, 52 is a microswitch, F is a film, Fa is a photographic film, and Fb is a photographed film. Patent applicant Canon Co., Ltd.

Claims (1)

[Claims] 1. A camera that continuously performs X-ray photography using roll film, including a supply magazine that stores unexposed film, a take-up magazine that stores exposed film that can be separated from the supply magazine, and an imaging and a camera body for feeding the film, and detecting means for detecting the operating state of a light shielding mechanism provided at the opening of the winding magazine;
An X-ray high-speed photographing camera characterized by comprising means for stopping film feeding in response to a signal from the detecting means.