JPH087846Y2 - Dental casting X-ray inspection system - Google Patents

Description

[Detailed description of the device]

[0001]

INDUSTRIAL APPLICABILITY The present invention ensures the positioning of the sample to be tested with respect to the X-ray photoconductor and the X-ray cone in an X-ray inspection apparatus for checking the presence or absence of a casting defect by destructive inspection of a dental casting. X-ray inspection apparatus.

[0002]

2. Description of the Related Art Dental casts, for example, denture bases made of titanium, may be damaged if they are used while casting holes (such as blow holes and contraction holes) are introduced during casting. It is said that it is desirable for quality control to investigate casting defects inside the casting by X-ray inspection in advance.

For this reason, conventionally, an X-ray generator serving as an X-ray source is arranged above the X-ray protected photographing box, and a cassette containing a photoconductor such as an X-ray film is arranged below the X-ray generator.
A sample table is placed between the radiation source and the photoconductor, and a casting, which is a sample to be inspected, is placed on the sample table, and a transmission image of the X-ray casting is X-rayed.
A device for projecting light onto a linear photoconductor to expose it is used.

A film cassette containing an X-ray film is supported by a supporting mechanism so as to be movable in the vertical direction,
An X-ray inspection device capable of magnifying and photographing by adjusting the distance between the sample to be inspected and the photosensitive surface of the film has also been proposed, and an X-ray image photograph is obtained by enlarging minute defects inside the casting. Is known (Shokaisho 60-79148)
issue).

[0005]

The conventional X-ray inspection apparatus for dental castings is such that the sample to be inspected is accurately placed in the center of the X-ray irradiation range when the sample to be inspected is placed and set on the sample table. Is difficult to position, and when re-imaging the same object again at the same position, the reproducibility is poor in the arrangement with the X-ray film image, and the sample image does not deviate from the film surface or is not irradiated with X-rays. Since it is placed at a position, there has been a problem that an X-ray image cannot be obtained.

In particular, when photographing a cast denture base that is smaller than the film photosensitive surface, it becomes uneconomical to use a large X-ray film, and the photosensitive surface used for imaging is divided into several times for effective use. It is necessary to plan.

Further, although the above technique for enlarging a small casting or a minute internal defect to take an X-ray image is convenient,
The distance d ₁ from the radiation source to the upper surface of the sample table is fixed, and the X-ray film cassette is moved up and down to make the distance d ₂ from the X-ray source to the photosensitive surface of the X-ray film variable. The ratio of the image size on the photosensitive surface of the X-ray film to the actual size of the test sample, that is, the enlargement ratio is d ₂ / d ₁ , and there is a limit to the height of the photographing box. In order to obtain a large magnifying power, it is necessary to increase d ₂ and thus the X-ray film itself.

In view of the above problems, the present invention makes it possible to accurately and easily position the sample to be inspected on the upper surface of the sample table, and also to improve the X ratio of the dental casting with a sample table that can be adjusted over a wide range. A line inspection device is provided.

[0009]

An X-ray inspection apparatus for dental casting of the present invention accommodates a cassette that is fixed to the inside lower part of an X-ray protected radiographing box and contains an X-ray photoconductor. A cassette holder, an X-ray source arranged in the upper part of the imaging box so as to face the photosensitive surface of the X-ray photoconductor, and a test sample placed on the cassette holder and the X-ray source. An X-ray inspection apparatus for a dental casting comprising a sample table and an opening / closing door provided in the imaging box for exchanging a sample to be inspected, wherein the sample table is provided between the cassette holder and the X-ray source. Is provided with a movement adjusting means for changing the magnification continuously or stepwise, so that the upper surface of the sample table is formed into an orthogonal line shape.
Alternatively, an illumination device that illuminates the entire X-ray irradiation area
It is characterized in that it is provided near the X-ray source .

Further, the present invention is the specimen stage is disposed between the cassette holder and the X-ray source, or but it may also be formed integrally with the cassette holder.

In the present invention, instead of the above-mentioned illumination device, a mark is attached on the upper surface of the sample table to display at least one of the X-ray irradiation range, the X-ray irradiation center and the projection range of the X-ray photoconductor. Including X-ray inspection equipment . In addition, the present invention,
An X-ray inspection apparatus comprising an X-ray shielding plate movably attached to the upper surface of the sample table, the X-ray shielding plate having an X-ray transmitting portion on the plate surface that divides the sample mounting range on the upper surface of the sample table into a plurality. It is a waste.

[0012]

In the X-ray inspection apparatus of the present invention, the sample stage moves up and down between the fixed X-ray source and the X-ray photosensitive member, so that the sample to be inspected placed on the upper surface of the sample stage is X-rayed. The closer to the source, the larger the magnification on the X-ray sensitive surface, and therefore the finer defects inside the casting, such as the cavities, can be enlarged and the shape and origin thereof can be investigated in detail.

Since the upper surface of the sample table is irradiated with the light in the form of orthogonal lines or in the X-ray irradiation range, it can be projected in advance within the X-ray irradiation range on the upper surface of the sample table and on the photosensitive surface of the lower photosensitive member. It is possible to specify the range of the test sample placement device and avoid failure of imaging due to poor placement.

Further, since the X-ray shield plate having the X-ray transmission part is movably attached on the sample table, only the X-rays transmitted through the transmission part are projected onto the photosensitive surface. An X-ray film image of the test sample placed on the X-ray is obtained, and therefore, the photosensitive surface of the X-ray photoconductor covered with the X-ray shield plate other than the transmission part remains unexposed. By appropriately moving and rotating the shield, the unexposed photosensitive surface can be used for the next photographing, and a large photosensitive member can be effectively used as compared with a test sample such as an X-ray film.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an internal side view of the X-ray inspection apparatus 1 according to the present invention. An X-ray protective wall 11 is provided below the X-ray source 21 below the X-ray generator 2 in the apparatus 1. A partitioned photographing box is provided, the cassette holder 6 is fixed to the bottom of the box, and the photosensitive surface of the X-ray film 7 contained in the cassette 71 loaded in the holder 6 is the X-ray source. It is set to be perpendicular to the central axis of the X-ray X from 21.

Above the cassette holder 6, the test sample 5
The sample table 3 made of synthetic resin on which is mounted is provided so as to be vertically movable by the movement adjusting means while holding the upper surface of the sample table 3 horizontally. In the movement adjusting means of this embodiment, a screw shaft 34 rotated by a motor 33 is erected at a corner in the inspection box, and a sample table holder 32 screwed to the screw shaft 34 is used to mount the sample table 3 on the sample table 3. Are held horizontally.

On the front surface of the photographing box, an opening / closing door 12 which is also protected by X-rays is provided, which is used for charging the sample 5 to be tested and for replacing the X-ray film cassette 71. An X-ray shielding glass for internal observation is attached to the side surface of the.

FIG. 2 shows the arrangement relationship between the X-ray source 21, the X-ray film 7 in the X-ray film cassette 71, and the sample table 3 which can be moved up and down. The horizontal dimension of the test sample 5 is enlarged and projected on the X-ray film 7 as the sample table 3 is raised and brought closer to the X-ray source 21, and an enlarged image is obtained on the phenomenon film. As shown in FIG. 2, the dimension enlargement ratio is X from the X-ray source 21 with respect to the distance d ₁ of the upper surface of the sample table 3 from the X-ray source 21.
This can be approximated by the ratio of the distance d ₂ of the line film 7, that is, d ₂ / d _{1. In} this example, the sample stage 3 can be brought closer to the X-ray source 21 and the enlargement ratio can be increased. If a scale indicating the distance of the sample table 3 from the X-ray source 21 or the magnification is attached to the side surface of the imaging box, the magnification can be read.

FIG. 3 shows a means for moving and adjusting the sample stage 3 in steps. In this example, horizontal holding plates 35, 35 'are attached to the rear side wall in the photographing box at two upper and lower positions so as to be foldable via hinges.
5, 35 'and the projecting pieces 36, 36' projecting from the side walls are horizontally held and locked. Therefore, the height of the sample table can be adjusted by selecting one of the upper and lower horizontal holding plates 35 and 35 ', and the unused horizontal holding plate is folded back along the wall surface.

FIG. 4 shows an X-ray inspection apparatus which irradiates the cross-shaped light markers 8a and 8b representing the central axis position of the X-ray cone X on the upper surface of the sample table 3, but in this example, Two illumination devices 81a and 81b having a light bulb and a slit (not shown) are fixed in the immediate vicinity of the X-ray source 21 above the radiographing box, and the upper surface of the sample table 6 also serving as the X-ray film cassette 71. The center position of the irradiated X-ray can be clearly indicated.

FIG. 5A shows an X-ray inspection apparatus in which the upper surface of the sample table 3 is irradiated with an illumination circle 8 of light that clearly indicates the X-ray irradiation range. In this example, the illumination device 81 is fixed to the upper corner of the photographing box, and the light passing from the light bulb 83 through the small circular light projecting portion 82 is reflected by the reflecting mirror 84 provided directly below the X-ray source 21. And illuminate the sample stage radially. In this case, the illumination device 81 and the reflecting mirror 8 are arranged so that the cone formed by the radiated light and the X-ray cone emitted from the X-ray source coincide with each other.
4 are arranged.

Therefore, even if the sample table 3'is raised, the size and position of the illumination 8'in the sample table 3'is X.
Since it coincides with the irradiation range of the pyramid, if the sample to be inspected is placed within the range of the illumination circle, it is reliably projected onto the photosensitive surface of the X-ray film 7, and the image of the sample to be tested deviates outside the photosensitive surface. The risk of doing so is avoided.

In FIG. 5A, a reflecting mirror 84 is a mirror body 84 using a metal aluminum thin film on a substrate made of synthetic resin.
In this case, it may be fixed so that it can be illuminated at all times. Further, as shown in FIGS. 5B and 5C, when the illumination circle 8 is not required, it is rotated by the hinge 85 (the same (B)) or slid between the holding members 86 and 87. (Same as (C)), a structure for retracting the reflecting mirror 84 from the X-ray irradiation area can also be adopted.

In FIG. 5 (A), a cross-shaped marker 9 that clearly indicates the X-ray irradiation central axis is described on the upper surface of the sample table 3. In addition, the crosshair divides the upper surface of the sample table 3 into four, and if a small test sample is placed in two or four simultaneously divided sections, it does not deviate from the X-ray irradiation range. , X-ray can be taken at the same time.

FIG. 6 (A) shows an X-ray shield plate 92 made of a rectangular lead plate for masking, which is placed on the upper surface of the sample table 3 as shown in FIG. 5 (A). This X-ray shield plate 92 is provided with an X-ray transmission portion 91 having a rectangular shape slightly smaller than one section formed by dividing the X-ray irradiation range into four as described above, that is, usually an opening 91. Therefore, if the test sample is placed in the opening 91 of the X-ray shielding plate placed on the upper surface of the sample table 3 and an X-ray image is taken, the photosensitive surface of the X-ray film 7 will have the opening. Only the X-rays transmitted through the portion 91 are exposed to light, and the region on the X-ray film covered with the X-ray shield plate 92 remains unexposed. So then,
If the X-ray shielding sheet is rotated 1/4 in the horizontal plane or inverted about the horizontal axis and then placed on the upper surface of the sample table 3 again, the X-ray shielding sheet X is transmitted to the unexposed area of the opening 91. The rays are projected and exposed, and at the same time, the exposure area of the previous photographing is shielded by the X-ray shielding plate. Therefore, in this example, one X-ray film can be used for X-ray imaging four times.

In FIG. 6B, the X-ray shield plate 92 placed and locked on the upper surface of the sample table 3 is provided with a large opening corresponding to four sections on the central axis of the X-ray cone. , Three rectangular X-ray shielding pieces 93a, 93b, 93c are slidably fitted in the openings, and the X-ray shielding pieces 93a, 9a, 9c are attached.
The remaining opening 91 that is not covered by 3b and 93c is used for the test sample mounting range. In this example, if the shielding piece 93c is slid so as to cover the opening 91, the original position of the shielding piece 93c is used as a new opening 91 in the mounting range of the test sample. By repeating this operation in sequence, one X-ray film 7 can be used for X-ray imaging four times.

In the example shown in FIG. 6, the placement range of the sample to be tested on the upper surface of the sample table 3 is divided into four, but similarly, two divisions or other divisions can be easily made.

[0029]

The X-ray inspection apparatus for non-destructive inspection of the dental casting of the present invention is a movement adjustment for moving the sample stage between the X-ray source and the X-ray film cassette, which are fixed to face each other. Since the means is provided, it is easy to magnify the image, and in particular, by bringing a thin cast product close to the X-ray source, it is possible to easily obtain an X-ray film image in which small cavities in the cast product are enlarged. .

Further, since the present apparatus illuminates the upper surface of the sample table in a cross shape or illuminates the entire mountable range of the test sample by the illumination device to indicate the mounting position, the X-ray image of the test sample is displayed. X
Positioning for photographing is facilitated without deviating from the photosensitive surface of the photoconductor such as a linear film.

Further, since the X-ray shielding plate having the X-ray transmitting portion is placed on the upper surface of the sample table and the range of X-rays exposed by the X-ray transmitting portion is divided, the same photoconductor is used for one photosensitive member. Alternatively, different test samples can be X-rayed a plurality of times, which saves the photoconductor, facilitates positioning of the test sample, and improves workability.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an X-ray inspection apparatus equipped with a movement adjusting means capable of adjusting the movement of a sample table.

FIG. 2 is a diagram showing a relationship among an X-ray source, an X-ray film, and a sample table.

FIG. 3 is an internal perspective view of an X-ray inspection apparatus including a movement adjusting unit.

FIG. 4 is an internal perspective view of an X-ray inspection apparatus including an illumination device.

FIG. 5 is a view (A) similar to FIG. 4 of an X-ray inspection apparatus including an illuminating device and a mirror body, and a moving mechanism diagram (B, C) of the mirror body.

FIG. 6 is a perspective view (A, B) showing a positional relationship between a sample table and an X-ray shielding plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Device main body 11 Protective wall 2 X-ray generator 21 X-ray source 3 Sample stage 34 Screw shaft 6 Cassette holder 7 X-ray film 71 Film cassette 81 Illumination device 9 Marker 91 X-ray transmission part 92 X-ray shielding plate

Claims (4)

[Scope of utility model registration request] 1. A cassette holder, which is fixed to the inside lower part of an X-ray-protected photographing box and accommodates a cassette containing an X-ray photosensitive member, and the photographing operation facing the photosensitive surface of the X-ray photosensitive member. An X-ray source placed on the upper part of the box, a sample stand placed between the cassette holder and the X-ray source to place the sample to be inspected, and provided on the imaging box to exchange the sample to be inspected In a dental cast X-ray inspection apparatus comprising an opening / closing door, a magnification adjusting movement adjusting means for moving the sample stage continuously or stepwise between the cassette holder and the X-ray source is provided. , The upper surface of the sample table in the form of orthogonal lines or in the entire X-ray irradiation
An X-ray inspection apparatus for a dental casting , wherein an illuminating device for irradiating light is provided near the X-ray source . 2. A lower part of the inside of an X-ray protected photographing box.
A housing that holds a cassette that is fixed and contains an X-ray photoconductor.
Face the set holder and the photosensitive surface of the X-ray photoconductor
The X-ray source placed above the imaging box and the cassette
Placed between the ruder and the X-ray source and mounting the sample to be tested
Installed in the imaging box to exchange the sample table and the sample to be tested.
X-ray inspection system for dental castings that consists of a door
Oite, connecting the sample stage between the cassette holder and the X-ray source
Movement adjustment for variable magnification to move continuously or stepwise
Means is provided, and an X-ray irradiation range, an X-ray irradiation center, and an X-ray irradiation center are provided on the upper surface of the sample table.
X of dental casting, characterized in that a mark for displaying at least one of the projected areas of the line photoconductor is attached.
Line inspection equipment. 3. An X-ray shielding plate having an X-ray transmission part on the plate surface for dividing the test sample mounting range on the upper surface of the sample table into a plurality of parts, which is movably attached to the upper surface of the sample table. One piece
Is an X-ray inspection apparatus described in 2 . 4. A cassette holder, which is fixed to the lower inside of an X-ray-protected photographing box and accommodates a cassette containing an X-ray photosensitive member, and the photographing operation facing the photosensitive surface of the X-ray photosensitive member. An X-ray source arranged on the upper part of the box, a sample table which is arranged between the cassette holder and the X-ray source or formed integrally with the cassette holder for mounting the test sample, and the test sample In an X-ray inspection apparatus for a dental casting, which comprises an opening / closing door to be replaced, an illuminating device for irradiating light on the upper surface of the sample stand in an orthogonal line shape or in the entire X-ray irradiation area is provided near the X-ray source. X-ray inspection system for dental casting.