JPH056484Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an X-ray detection device that uses X-rays to see through or photograph precision cast products such as dental prostheses and restorations to detect bubbles, nests, and other defects. It is something.

Among the industrial X-ray inspection devices commonly used in the past, those with small objects to be inspected are used for various purposes, such as those that inspect tape breaks on cassette tapes, those that inspect the connections of plugs for electrical appliances, and many others. However, all of them target mass-produced products, the inspection parts are limited, and the inspection means are simple. In comparison, precision cast products such as the aforementioned dental prostheses have complex, precise, and diverse shapes, and internal defects such as air bubbles, nests, and unevenness in material and wall thickness must be carefully and accurately detected. X to detect
The line inspection device must satisfy the following conditions. Condition (1) is to project fluoroscopic images of the subject in all directions onto a fluorescent screen using an X-ray emitting cone from one direction, or to manipulate the direction and angle of the subject in order to capture images on film. (2) the above-mentioned fluoroscopic images or photographed images are clear and have excellent inspection performance; (3) the X-ray control operation is easy; (4) the (5) The device must be small and easy to handle. However, some conventional dental cast X-ray devices on the market have problems and drawbacks in any of the above five conditions, and in particular, devices that meet conditions (1) and (5) are still not commercially available. The current situation is that this is not the case.

This invention was made in view of the above-mentioned current situation, and is intended to solve the drawbacks and problems of the conventional dental casting X-ray inspection apparatus. In other words, the X-ray source, fluoroscopy, and film mechanism are compactly packaged in a protective case, making the device small enough to be placed on a desk, and an easy-to-operate X-ray control panel is installed outside the protective case, allowing the operator to sit on a chair. A viewing window is provided at a position where the fluoroscopic image can be observed in a comfortable posture, and while the operator is observing the fluoroscopic image, a magic hand operated with the right hand, for example, is used to place the test sample on the sample stage as if using the hand. This invention relates to a dental casting X-ray inspection apparatus characterized in that it can be freely selected and set in any direction and angle with respect to the radial cone axis as if directly handled.

Embodiments of this invention will be described below with reference to the drawings. FIG. 1 is a front view of a dental casting X-ray inspection apparatus according to an embodiment of the present invention, showing a part of its interior, and FIG. 2 is a side view showing the internal structure of the apparatus. In the figure, the device 1 is movably placed on an examination table 2, for example, with a width W of about 0.35 m and a height H.
It is small, measuring approximately 0.65m and depth D approximately 0.35m.
The X-ray source 3 shown in FIG. 2 is a closed-type X-ray generator installed above the rear of the device, and the X-ray tube, main transformer, and heating transformer are housed in a closed container. indicates the focal position of the X-ray tube, 5 is the X-ray radiation window of the X-ray tube, and 6 is the irradiation tube. An autotransformer 8 for adjusting the power supply voltage is attached to the central support plate 7, with which the tip of the irradiation tube 6 engages. Returning to FIG. 1, an X-ray control panel 9 is provided at the front of the upper part of the device, and on the left side of the panel, from below, a power switch 10, the autotransformer adjustment knob 11, and a main transformer primary voltage indicator 12 are installed. On the right side there is an X-ray exposure indicator light 13 at the top and a tube voltage adjustment knob 1 at the center.
4 and a timer 15 for setting the X-ray exposure time during imaging are arranged, and three pushbuttons are provided below: a fluoroscopy pushbutton F, a radiography pushbutton R, and an X-ray exposure pushbutton X. ing. By these operations, it is possible to clearly adjust the fluoroscopic image and photographed image according to the specimen to be examined. An X-ray cone (indicated by a two-dot chain line) 16 emitted from the X-ray tube focal point 4 shown in FIG. 2 passes through the test sample S at a position as close as possible to the sample stage 17. The test sample S is held by a sample gripper 20 made of an X-ray transparent member, which is provided at the tip of the operating rod 19 of the magic hand 18, which is the main part of this device, and is held by a magic hand 18 that is the main part of this device. By operating the hand 21 and the slide knob 22, any direction and angle with respect to the X-ray radiation conical axis 16C can be freely set. The free operation of this magic hand 18 is shown in Figure 3~
This will be explained in detail with reference to Fig. 6, but Fig. 1 shows the free bearing part 24 of the magic hand installed on a part of the wall 23' of the protective case covered with a lead plate 23 and provided with X-ray shielding. In order to prevent leakage of X-rays from the bearing part, the relative position of the movable shielding plate 25 that interlocks with the operation stick 19 is shown. Note that the (+) on the left side of the test sample S in FIG. 2 indicates the axis 19C of the magic hand operating rod 19. Below the sample stage 17, there is a film cassette support mechanism 26 into which a film cassette containing X-ray film is loaded during imaging, and further below that is a fluorescent screen 27 for fluoroscopy, with a thickness of, for example, A 5 mm lead-containing glass 28 is fixed. The transmitted X-ray image of the test sample projected onto the fluorescent screen 27 is converted into a visible light image, and the lead-containing glass 28 absorbs unnecessary X-rays and is magnified by, for example, a convex lens 29. The image is projected onto a reflecting mirror 30 provided at a predetermined oblique angle at the bottom. The sample transmitted image projected onto the reflecting mirror 30 has a height h from the examination table 2 on which the apparatus 1 is installed approximately 30 cm, that is, the position and angle of the eye 31 of the operator sitting on a chair in front of the examination table. It can be observed easily and clearly by means of an observation window 33 which is suitably provided on the front cover 32 of the device at an elevation angle of 45°, for example. 34 is lead-containing glass that protects the operator's eyes from scattered X-rays within the device. The front cover 32 is pivotally connected to the front wall plate 35 of the apparatus by a pair of hinges 36, and when inserting and removing the test sample S and loading/unloading the film cassette,
It can be opened in the direction of arrow a using the hinge 38 as a fulcrum, and during inspection, it is closed in the position shown in the figure and closed by the suction force of, for example, a magnetic catch (not shown) provided inside the front cover 32. The state is maintained reliably. Furthermore, when the front cover 32 is open, a safety switch (not shown) is activated and no X-rays are emitted.
37 is a fuse, 38 is a captire cord for an X-ray exposure hood switch, and 39 is a power cord.

Next, the magic hand 18 which can be operated with one hand (in this example, the right hand) will be explained with reference to FIGS. 3 to 6.
FIG. 3 is a front view seen from the axial direction of the operation stick 19, showing the structure of the universal bearing part 24 of the magic hand;
4 and 6 are front views of the magic hand 18 as seen from the operator, and FIG. 5 is a plan view thereof. The swivel bearing part 24 has a ring 42 made of, for example, acetal resin, which has a small coefficient of friction and excellent mechanical strength and is widely used in bearings and gears, on a bracket 41 that is fixed to the wall surface 23' of the protective case with screws 40 or other means. 1 fixed to both arms 44 of this bearing 43.
It is comprised of an inner bearing 46 that is rotatably supported by the tips 45T of the pair of screw shafts 45 and is rotatable in the vertical direction.
The operating rod 19 that passes through the inner bearing 46 is connected to the gap adjustment screw 4 of the cut-in portion 47 provided at the upper part of the inner bearing.
8, the operating rod 19 is supported so that it can be easily slid in the axial direction and rotated about the axial center by the operator's one-handed operation. This is the bearing part 2 that can swing freely in the X and Y axis directions.
It is 4. Next, referring to FIG. 4, the sample gripping tool 20 of the magic hand 18 and its operation mainly in the Y-axis direction will be explained. The movable shielding plate 25 is omitted from illustration. The sample gripping tool 20 has an operating rod 19 rotatably supported on a distal end fitting 49 via a washer 50 by a mounting screw 51, and is shaped like a clothespin. That is, a pair of claws 52
is made of a member transparent to X-rays, for example, a plastic material such as acrylic resin, and has a letter-shaped bearing 53;
The spring 54 securely holds the sample S (not shown) at its tip 52T as shown in the figure. If the handle 21 is now operated in the direction of arrow Y, the sample (not shown) held by the grip tip 52T will be transferred to the sample stage 17.
You can move it up and down α°, for example, about 20 to 25°, but
If you move it upwards, which increases the distance from the film or fluorescent screen, the image will be magnified and blurry, so there is no need to raise it too much. Furthermore, since the operating rod 19 is slidable and rotatable relative to the bearing 24, by sliding the handle 21 in the direction of arrow b or twisting it in the direction of arrow c, the inspection area of the sample can be moved along the radial cone axis. (See Figures 1 and 2) It can be set almost freely for 16C. Next, move to Figure 5 and press the operation stick 19.
The operation in the X direction will be explained. Handle 2 as above
By operating in the direction of arrow X of 1, the grip tip 52
The sample T can be moved horizontally by β°, for example about 40°. Furthermore, the sliding operation of the handle 21 in the direction of arrow b and the twisting operation in the direction of arrow c are also applied in the same manner as described above. Although Figures 4 and 5 are shown separately for explanation, the actual handle operation is
Operations in the Y direction and the b and c directions can be performed simultaneously using only the operator's right wrist. Next, before explaining an arbitrary angle setting means within a predetermined range with respect to the axial direction of the operating rod 19 of the grip 20 with reference to FIG. 6, a part thereof will be explained with reference to FIG. A screw 55 is installed in the upper pawl 52U of the grip 20, and one end of the screw 55 is connected to a connecting fitting 56, for example, with a piano wire of 1.4 mm diameter. Naru operation wire 5
7 is fixed at the other end 57T to the slide knob 22 through the inner cavity 19I of the hollow operating rod 19. 58 is a groove cut in a part of the circumference of the operating rod 19. Moving on to Figure 6, now slide knob 2
2 to the position 22 in the direction of arrow d with the thumb of the right hand, the operating wire 57 pushes the pawl 52U via the connecting fitting 56 at one end thereof. For this reason, as mentioned above, the grip 20 is rotatably supported around the screw 51 as a fulcrum, so that the sample gripped at the tip 52T is held at an angle of depression of γ°, for example, approximately Tilt it 30 to 40 degrees. Similarly, by returning the slide knob 22 in the direction of the arrow e and moving it further to the right from its original position, the gripper tip 52T can have an elevation angle θ° of about 20°, for example. As described above, the magic hand 18 of this invention allows selection and setting of the inspection site in any direction and angle with respect to the radial pyramid axis 16C by one-handed operation of the handle 21 and slide knob 22 outside the device, as if directly done with the hand. Similarly, it can be done freely.

Although the embodiments of this invention have been described above, it goes without saying that this invention is not limited to the illustrations and descriptions. For example, the movable angles α, β, γ, and θ of the operating rod and sample grip are not limited to the angles described.

Since this device is constructed as described above, it eliminates the shortcomings and problems of conventional dental casting X-ray equipment, and enables inspection of cast bodies within the X-ray irradiation field as freely as you wish, as if you were handling them with your hands. By providing a magic hand that can aim the body part at the X-ray radiation cone axis, inspection accuracy by fluoroscopy and photography is high, and it is not only easy to handle and work efficiently, but also compact and inexpensive. We were able to provide a device that was

[Brief explanation of drawings]

Fig. 1 is a front view (partially showing the inside) of a dental cast X-ray inspection apparatus according to an embodiment of this invention, Fig. 2 is a side sectional view showing the internal structure of the above-mentioned apparatus, and Fig. 3 is a diagram of the above-mentioned apparatus. FIG. 4 is a front view of the flexible bearing part of the magic hand; FIG. 4 is a front view explaining the operation of the magic hand in the Y-axis direction; FIG. 5 is a plan view explaining the operation of the magic hand in the The illustration is magic
FIG. 3 is a partially sectional front view illustrating the operation of the sample gripping tool of the hand. 3...X-ray source, 4...X-ray source focal point, 9...X-ray control panel, 16...X-ray radiation cone, 16C...X-ray radiation cone axis, S...Test sample, 17... Sample stand, 18
...Magic hand, 19...Control stick, 20...
...Sample grip, 21...Handle, 22...Slide knob, 23...X-ray shielding lead plate, 24...Bearing part of magic hand, 25...X-ray shielding plate (movable shielding plate) of bearing part , 26...Film cassette support mechanism, 27...fluorescent screen for see-through, 29...lens, 30...reflector, 33...observation peephole,
52...A pair of claws on the grip.

Claims (1)

[Claims for Utility Model Registration] 1. A sample stage that supports an X-ray source and a reflecting mirror in a predetermined opposing relationship, and on which a test sample is placed between them;
A film cassette support mechanism, a fluorescent screen for fluoroscopy, and a lens are arranged respectively, and these are housed in a protective case that is shielded from X-rays, and an X-ray control panel and an X-ray control panel are installed outside the protective case. In an apparatus that is provided with an observation peep window facing each other and is intended to see through and photograph the test sample, a bearing section provided on the wall surface of the protective case and provided with X-ray shielding and swingable in the X and Y axes directions; It consists of an operating rod that is supported on a bearing and can be slid and rotated by the operation of one hand of the operator, and a sample gripping tool that is a pair of claws made of an X-ray transparent member and supported at the tip of this operating rod. A dental casting characterized in that the test sample is held on the sample stage by a magic hand, and the selection setting of an arbitrary test part of the test sample can be operated from outside the protective housing. Body X-ray inspection device. 2. A utility model in which the sample gripping tool of the Magic Hand can be set at any angle within a predetermined range with respect to the axial direction at the tip of the operating stick by operating a slide knob provided on the handle of the operating stick. A dental casting X-ray inspection apparatus according to claim 1.