JPH0439524Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is 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 about improvement. Precision cast products such as dental prostheses have complex and precise shapes and come in a wide variety of shapes, so we can accurately detect any internal defects that cannot be detected by external inspection, such as bubbles, nests, or uneven material or wall thickness. In order to detect it, it must be an X-ray inspection device. The authors devised an X-ray inspection device exclusively for this dental precision casting.
The ``Dental Casting X-ray Inspection System'' of the previously filed ``Utility Application 1986-125730'' handles the inspected castings within the X-ray irradiation field with a magic hand from outside the device, making it seem as if it were handled manually. The inspection site can be aimed at the X-ray emitting cone axis in any direction or angle at will, and inspection accuracy by fluoroscopy and photography is high, and work efficiency is high.It is also compact and can be used on a tabletop. It is a convenient device that is easy to handle. Since the film cassette support position of this device is close to the sample to be tested held by the magic hand, the image is close to the actual size of the sample and can be captured directly on the film. However, as mentioned above, there are a wide variety of dental castings, and in addition to the metal bases suitable for direct imaging, such as the metal bases for full dentures that serve as abutments for complete dentures, there are also metal crowns called crowns, etc. Many of them are small, such as porcelain abutments for porcelain teeth. For this reason, although the above-mentioned apparatus can observe an enlarged see-through image of a small precision cast product such as a metal crown, it has the disadvantage that the enlarged photographed image cannot be captured on film.

This invention was made in view of the above-mentioned current situation, and it eliminates the drawbacks of the dental casting X-ray inspection system that was applied for earlier, and allows direct and enlarged imaging to correspond to the size of dental castings. The above-mentioned apparatus has been modified so that it can selectively perform one of the above methods, carefully inspect all objects to be inspected regardless of their size, and accurately detect all internal defects. In other words, it protects any fluoroscopic device, such as the fluoroscopic device in the device of Utility Model Application No. 125730/1983, which consists of a fluorescent screen, a lens, and a reflecting mirror, or the fluoroscopic device, which consists of an image tube and an imaging tube in an X-ray television system. In addition to providing an evacuation space and a moving mechanism for evacuation outside the X-ray radiation area with easy operation within the housing, the distance between the subject and the film is extended by evacuation of the fluoroscopy device, and a position where, for example, a double magnified image can be obtained. This invention relates to a dental casting X-ray inspection apparatus characterized in that a film cassette support mechanism is attached to the dental casting body.

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 as an embodiment of this invention, in which the fluoroscopy device is composed of an image tube and an image pickup tube, and the fluoroscopic image is observed with a television picture tube. FIG. 2 is a side sectional view showing the internal structure of the device. In the figure, a small device 1 is movably placed on an examination table 2 and has a width W of about 0.35 m, a height H of about 0.65 mm, and a depth D of about 0.45 m. The X-ray source 3 shown in FIG. 2 is a closed type X-ray generator, and the built-in X-ray tube has a minute focus suitable for magnified imaging, and the focus position is indicated by 4. In addition to the X-ray tube, a main transformer and a wire heating transformer are housed in the closed container. 5 is an X-ray emission window of the X-ray tube, 6 is an irradiation tube, and an autotransformer 8 for X-ray control is attached to a central support plate 7 that engages with the irradiation tube. Returning to FIG. 1, an X-ray control panel 9 is provided at the front of the upper part of the device, including a power switch 10, an autotransformer adjustment knob 11, and a primary voltmeter 1.
2, an X-ray exposure indicator light 13, a tube voltage adjustment knob 14, an exposure time setting timer 15, and three operation push buttons 16 are arranged. Of the three buttons, F is for fluoroscopy, R is for shooting (direct and enlarged), and X is for X.
It is for radiation exposure. The X-ray radiation cone X _R emitted from the X-ray focal point 4 shown in FIG.
Subject S (hereinafter referred to as sample) is located close to this.
irradiate. In order to prevent these X-rays from leaking to the outside, each inner wall of the protective case 18, which has the central support plate 7 as its top plate, is covered with lead or shielding plates to provide complete X-ray protection for workers. The sample S is held by a sample gripper 21 made of an X-ray transparent member provided at the tip of the operating rod 20 of the magic hand 19 shown in FIG. Any direction and angle with respect to the X-ray radiation cone axis X _C can be freely set by operating only the right hand. Note that 19C in FIG. 2 indicates the axial center position of the magic hand 19. Since the swivel bearing 24 of this magic hand penetrates a part of the wall surface 18W of the protective case 18,
A movable shield plate 25 that prevents leakage of X-rays from this part is linked to the operation stick 20, so that X-rays will not leak to the outside even when the operation stick 20 of the magic hand is moved vertically and horizontally. The flexible operability of the magic hand 19 is detailed in Utility Model Application No. 125730/1983, and since it is not directly related to the main part of this invention, the explanation will be omitted here. The essential part of this invention is a configuration that allows direct imaging and enlarged imaging to be performed selectively depending on the size of the sample S, which will be explained next.

Now, if the sample S is a relatively large cast product such as a metal floor, the sample transmission X-ray cone _XR is the film cassette support mechanism A2 directly below the sample stage
6 (in a hollow state during fluoroscopy), the light enters the input fluorescent surface of an image tube 27 having a diameter of, for example, 3 inches. The output visible light image of the image tube 27 is converted into a video signal by an image pickup tube 28 directly connected thereto, and is displayed at an arbitrary magnification on the screen of a television picture tube 29 placed alongside the apparatus. Device 1
The electric circuit between and the television picture tube 29 is omitted from illustration.
Further, the image tube 27 and the image pickup tube 28 are shown in external view without being shown in cross section. While observing this television image, all inspection parts of the sample are visually inspected using the magic hand 9, and if necessary, the film cassette 3 is inserted into the film cassette support mechanism A26.
0 (indicated by a two-dot chain line) and photographing, an almost actual size image of the sample S can be obtained on the film.
This is a direct imaging method, and the image tube 27 and image pickup tube 28 are the fluoroscopic device 31 of this device.
Next, if the sample S is a small cast product such as a metal crown, the fluoroscopic image of the television picture tube 29 can be freely enlarged by electrical adjustment of the television system, but the film image obtained by photographing is too small and the diagnostic accuracy is low. low. For example, by enlarging this film image,
The main part of this idea was to increase the diagnostic accuracy by doubling the magnification, one of which was the fluoroscopy device 3.
The space required for 1 to escape outside the X-ray radiation cone X _R area in the protective housing 18, that is, the fluoroscopy device 31
A storage chamber 35 having an internal volume capable of accommodating the
This is a moving mechanism M that selectively moves both positions of the storage chamber. The moving mechanism M includes two rollers 33 that are pivotally supported on both sides of a frame part 32 (made of a ferromagnetic material such as iron) that supports the fluoroscopic device.
and two guide rails 34 on which the rollers roll and on which the see-through device 31 runs. Another important part is the film cassette support mechanism B36 formed on a part of the guide rail 34 during enlarged photography.
It is. Since the guide rail 34 uses a member having the same cross-sectional shape as the cassette support mechanism 26 shown in FIG. This results in a film cassette support mechanism B36 that supports the film cassette 30 of a predetermined size in a fixed position. By placing the film 38 at a position where the distance from the sample S is increased in this way, as _shown in _{FIG .} By setting the positional relationship of ≧L ₁ , it is possible to take pictures with a magnification of twice or more. The fluoroscopic device 31 is moored at the solid line position through the suction force of the magnetic catch 39 provided at the base of the guide rail during the above-mentioned direct imaging, but when performing enlarged imaging, first the front lid 40 of the device is attached by its handle 41. through the magnet in the direction of arrow a, and insert the fluoroscope 31 into the magnetic catch 3.
When it is pushed out in the direction of arrow b against the suction force of 9, it moves smoothly and lightly to the position indicated by the dashed line 31' in the storage chamber 35 by the rolling of the roller 33, and the underframe 32
The rear end 32L of the rail is attracted to a magnetic rubber 42 provided at the base of the rail and is moored at this position. After the movement of the fluoroscopy device 31 is completed, the film cassette 3
0 into the cassette support mechanism B36 and close the front lid 40, preparations for magnified photography are completed.

The above is the actual application of this invention, but this invention is not limited to illustrations or explanations. For example, a fluoroscopic device is composed of a fluorescent screen/lens for fluoroscopy and a reflecting mirror, and the image of the reflecting mirror is projected onto the front of the device. The present invention can be similarly applied to an apparatus in which observation is performed through a viewing window provided therein. In addition, the film cassette support mechanism is
Instead of being provided at different locations, one mechanism may be configured to be movable up and down. In addition, the magnification rate can be adjusted by changing the distance ratio of L ₁ and L ₂ or by further extending L ₂ .
It can also be increased by 2.5 to 3 times or more.
Furthermore, it is easy to automate the fluoroscope moving mechanism, and it goes without saying that it is well within the scope of this invention. Further, the storage chamber is not limited to the rear part of the device, but may be provided on the left or right side.

Since this device is constructed as described above, it eliminates the drawbacks of dental cast X-ray inspection equipment such as that disclosed in Utility Application No. 58-125730, and can be easily operated to accommodate a wide variety of sample sizes. By being able to selectively switch between direct photography and magnified photography with The device is small and compact, easy to handle, and provides a convenient device with excellent work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a front view of a dental casting X-ray inspection apparatus using an X-ray television system as an embodiment of this invention, and FIG. 2 is a side sectional view of the apparatus. 3...X-ray source, 4...X-ray focus, 9...X-ray control panel, 17...sample stage, 18...protective case, 19...
…Magic Hand, S…Subject, X _R …X
Ray radiation area, X _C ...X-ray radiation cone center axis, 26...
...Film cassette support mechanism for direct photography A, 27
...Image tube, 28...Image tube, 29...TV picture tube, 30...Film cassette, 31...
Fluoroscopic device, 32... Fluoroscopic device frame portion, 33... Roller, 34... Guide rail, 35... Fluoroscopic device storage chamber, 36... Film cassette support mechanism B for enlarged imaging, L ₁ ... X-ray Focus-subject distance, L ₂
. . . Subject-film distance, M . . . Fluoroscope movement mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An X-ray source, a sample stage, a film cassette support mechanism, and a fluoroscopy device are arranged at predetermined relative positions in a protective case with an X-ray shield,
Further, an X-ray control panel is provided outside the protective case, and means is provided for gripping the subject on the sample stage and freely selecting and setting the inspection part in any direction and angle with respect to the central axis of X-ray radiation. In the device for fluoroscopy and photographing the subject, there is provided an evacuation space and a movement mechanism for the fluoroscopic device to allow the fluoroscopic device to be evacuated outside the X-ray radiation area within a protective case, and the object is The distance between the films is extended, and a film cassette support mechanism is attached at a position where an enlarged image of the subject can be obtained, so that shooting of the subject can be selectively switched between direct shooting and enlarged shooting depending on the size of the subject. A dental casting X-ray inspection device characterized by: 2. Dental cast X-ray as claimed in claim 1, in which the fluoroscopic device is composed of a fluorescent screen for fluoroscopy, a lens, and a reflecting mirror, and an observation window facing the reflecting mirror is provided on the front surface of the protective case. Inspection equipment. 3. The dental casting X-ray inspection device according to claim 1, wherein the fluoroscopic device comprises an image tube and an imaging tube, and a television picture tube for fluoroscopic image observation is attached to the device. 4. The dental casting X-ray inspection apparatus according to any one of claims 1 to 3, wherein the film cassette support mechanism is movable in the vertical direction.