JP2001340325A - Radiation cassette and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable acquirement of a radiation cassette of high quality by preventing a deformation of a frame made of a resin integrally molded with a flat plate member with simple steps and constitution. SOLUTION: A housing 14 has the flat plate member 24 to be externally radiated with a radioactive ray, metal plate members 26a to 26c disposed at edges of inner surface of the member 24, and frames 28a to 28d integrally molded with the ends 24a to 24d of the members 24 for embedding the members 26a to 26c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a housing for accommodating a radiation image recording carrier, and a lid which is openably and closably mounted on at least a part of the housing. The present invention relates to a radiation cassette including a light-shielding plate to be held and a method for manufacturing the radiation cassette.

[0002]

2. Description of the Related Art For example, stimulable phosphors (stimulable phosphors)
There is known a system that once records radiation image information of a subject such as a human body, reproduces the radiation image information on a photographic photosensitive material such as a photographic film, or outputs a visible image on a CRT or the like. I have.

The stimulable phosphor is composed of radiation (X-ray, α-ray, γ
(Rays, electron beams, ultraviolet rays, etc.), a part of this radiation energy is accumulated, and after irradiation with excitation light such as visible light, a phosphor that emits stimulated emission according to the accumulated energy is referred to. This stimulable phosphor is usually formed into a sheet and used as a stimulable phosphor sheet.

On the other hand, radiation such as a human body
An operation of irradiating X-rays and directly recording radiation image information of the subject on a photographic film is performed. Then, a visible image is obtained by subjecting the photographic film to a development process, and a medical diagnosis or the like is performed using the visible image.

The above-mentioned radiation image recording carriers such as the stimulable phosphor sheet and the photographic film are usually loaded one by one in a cassette into a radiographing apparatus, and X-rays are passed through the cassette to the radiation image recording carrier. Has been irradiated.

[0006] In this type of cassette, if the entire front plate to be irradiated with X-rays is to be integrally formed, problems such as mixing of foreign matter, problems in strength, and reduction in X-ray transmittance have occurred. For this reason, a cassette is generally known in which the flat plate portion is formed of, for example, a carbon plate or an aluminum plate, and the frame members on four sides are formed by insert molding using plastic or the like.

[0007]

However, in the above-described cassette, when the frame member is formed from a resin such as plastic, molding shrinkage easily occurs, and the cassette is warped (deformed) on four sides.
Has been pointed out. In particular, in a large-sized cassette, this kind of warpage becomes considerably large, and there is a high possibility that a defective product is produced. Therefore, it is conceivable to mold using a resin that hardly generates warpage, for example, a resin containing glass fiber or the like, but this type of resin has a problem that its appearance quality is inferior.

An object of the present invention is to solve this kind of problem and to provide a high-quality radiation cassette with a simple structure and steps without deformation and a method of manufacturing the same.

[0009]

In the radiation cassette and the method of manufacturing the same according to the present invention, a metal plate member is disposed at an inner surface edge of a flat plate member constituting a housing, and the metal plate member is embedded. Thus, a resin frame is integrally formed with the end of the flat plate member. For this reason, deformation due to molding shrinkage of the resin frame can be effectively prevented via the metal plate member. In addition, when the housing is deformed, the deformation of the housing can be easily and reliably corrected by performing the pressing process on the metal plate member.

Further, the metal plate member is set to have an L-shaped cross section, so that deformation of the metal plate member can be effectively avoided with respect to molding shrinkage of the resin frame portion. This allows
With a simple configuration, it is possible to reliably prevent the casing from being deformed.

Further, a metal plate member is embedded in the flat plate member at three other ends except one end which constitutes an opening for taking out the radiation image recording carrier, and a resin frame is integrally formed. Is done. For this reason, the molding process of the resin frame portion is performed simply and in a short time in a single process, and the efficiency of the manufacturing process of the entire radiation cassette can be easily improved.

Further, a foldable portion is provided at an end of the light-shielding plate to be bent toward the housing, and a reinforcing metal member is attached to an inner surface of the foldable portion. Therefore, the strength of the entire radiation cassette is effectively improved, and even if a considerable load is applied, the deformation of the entire radiation cassette can be reliably prevented.

[0013]

FIG. 1 is an exploded perspective view of a radiation cassette 10 according to an embodiment of the present invention, and FIG.
FIG. 2 is an explanatory perspective view of the radiation cassette 10.

The radiation cassette 10 includes a housing 14 for accommodating a stimulable phosphor sheet (radiation image recording carrier) 12,
Lid 16 attached to a part of the housing 14 so as to be openable and closable
A light-shielding plate 18 for holding the stimulable phosphor sheet 12 in a light-tight manner, and an inside of the housing 14 covering the entire back surface 12b of the stimulable phosphor sheet 12 opposite to the radiation-irradiated surface 12a. And a lead sheet 20 having a free end 20 a extending toward the lid 16, one end fixed to the back side of the lid 16, and the other end connected to the lead sheet 20.
And a guide sheet 22 interposed between the stimulable phosphor sheets 12 and disposed in the housing 14 (see FIGS. 1 to 3).

As shown in FIG. 1 and FIG.
Is a flat plate member 24 made of, for example, a carbon plate irradiated with radiation from the outside, and taking out the stimulable phosphor sheet 12 from the four ends 24a, 24b, 24c and 24d of the flat plate member 24. Other ends 24b to 24d excluding one end 24a constituting the opening 25 for use
Metal plate members 26a, 26b and 26c arranged at the inner surface edge portion, and a resin frame portion 28a embedded with the metal plate members 26a to 26c and integrally molded with the ends 24a to 24d of the flat plate member 24 , 28b, 28c and 28d.

As shown in FIGS. 4 and 5, the metal plate members 26a to 26c are formed by bending a metal plate such as a SUS material or an aluminum material into an L-shaped cross section. It is temporarily attached to the surface with a double-sided adhesive tape or the like. A plurality of openings 30 such as holes and cutouts are formed on the bottom surface of the metal plate members 26a to 26c placed on the flat plate member 24.

The metal plate members 26a and 26c are formed by the flat plate member 2
4, while the metal plate member 26b is configured to extend along the short-side end 24c of the flat plate member 24. It is configured in a shape. Both ends of the metal plate member 26b can be in contact with and supported by ends of the metal plate members 26a and 26c.

As shown in FIG. 1 and FIG.
Locking means 32a, 32b for fixing the lid 16 are provided on the tip side (the frame 28a side) of the b and 28d, and the locking means 32a, 32b are provided on the tip of the frame 28b, 28d. The pressing pin insertion holes 34a and 34b for releasing the pressure pins are formed.

The light shielding plate 18 closes an upper portion of the housing 14 and is detachably attached to the housing 14 via a stopper pin (not shown). The light shielding plate 18 is integrally provided with a lid 16 via a hinge portion 36, and the lid 16 is attached to the housing 14 so as to be openable and closable.
The cover 16 has a bar code reading window 38 formed thereon, and the cover 16 is provided with unlocking knobs 40a and 40b capable of releasing the locking means 32a and 32b by the operator. Be attached. Lock claws 42a and 42b are formed on the back surface of the lid 16 so as to be engageable with the lock means 32a and 32b.

As shown in FIG. 1 and FIG.
Folded portions 44a, 44b, and 44c that are bent toward the housing 14 are provided at the three ends, and reinforcing metal plates (metal members) 46a, 46b are provided on inner surfaces of the folded portions 44a to 44c. And 46c are attached. The metal plates 46a to 46c are folded portions 44a to 44c.
Are supported by being inserted into a plurality of holes 50 formed in the metal plates 46a to 46c. Metal plates 46a to 46
c is made of a high-strength material, for example, SUS spring steel, and has a structure capable of sufficiently receiving a predetermined load.

As shown in FIG. 1, an opening 5 corresponding to the window 38 of the lid 16 is provided on the free end 20a side of the lead sheet 20.
2 are formed. The guide sheet 22 is made of a resin sheet, for example, a PP (polypropylene) sheet, and has a window 3 at one end 54 fixed to the back surface of the lid 16.
A notch 56 is formed corresponding to No. 8. The portion of the guide sheet 22 folded toward the housing 14 has a window 38.
The opening 60 is formed correspondingly.

The radiation cassette 10 configured as described above
Hereinafter, a method for manufacturing the will be described.

First, as shown in FIG. 5, a flat plate member 24 made of a carbon plate or the like is prepared, and a metal plate having an L-shaped cross section corresponding to the three ends 24b, 24c and 24d of the flat plate member 24 is prepared. The members 26a, 26b and 26c are temporarily attached via an adhesive means such as a double-sided adhesive tape. Next, as shown in FIG. 6, the flat plate member 24 to which the metal plate members 26a to 26c are temporarily attached is disposed in the injection molding machine 70, and the plurality of gates 72 provided in the injection molding machine 70 are used to transmit the cavities. (Not shown) is filled with a molten resin.

Thus, the ends 24a to 24a of the flat plate member 24 are formed.
The frame portions 28a to 28d are integrally formed on the 24d, and the metal plate members 26a to 28d are formed on the frame portions 28b to 28d.
26c is buried (see FIG. 4). For this reason, the housing 14 is formed by integrating the flat plate member 24 and the frame portions 28a to 28d made of resin.

As described above, in the present embodiment, the flat plate member 2
4 at the ends 24a to 24d by injection molding.
When integrally forming 28d, metal plate members 26a to 26c such as SUS material and aluminum material are arranged in advance at the ends 24b to 24d of the flat plate member 24, and the metal plate members 26a to 26c It is embedded in 28b to 28d. Thereby, even if molding shrinkage occurs in the frame portions 28a to 28d, it is possible to effectively prevent the casing 14 from being deformed such as warping under the reinforcing action of the metal plate members 26a to 26c.

Therefore, in the present embodiment, the molding shrinkage when integrally forming the frame portions 28a to 28d is performed by a simple process and configuration of disposing the metal plate members 26a to 26c having an L-shaped cross section on the flat plate member 24. , And the effect of efficiently manufacturing a high-quality casing 14 without deformation such as warpage can be obtained.

In particular, when manufacturing the casing 14 having a large size, the casings 14 are formed by shrinkage of the frame portions 28a to 28d.
Is deformed, press processing may be performed on the portion where the deformation has occurred, for example, the frame portion 28b in which the metal plate member 26a is embedded. That is, as shown in FIG. 7, the frame portion 28b is disposed between the lower mold 82 and the upper mold 84 constituting the press machine 80, and the metal is pressed by the lower mold 82 and the upper mold 84 under the pressing action. The plate member 26b is pressed. For this reason, the frame part 28b is easily and reliably corrected from the warped shape shown by the two-dot chain line in FIG. 7 to the flat shape shown by the solid line, and it is possible to maintain the flatness of the entire housing 14.

The housing 14 manufactured as described above is subjected to various processing operations and assembling operations. For example, the locking means 32a and 32b are mounted on the frame portions 28b and 28d, and the hole portions 34a are provided. , 34b are formed.

Next, the operation of the radiation cassette 10 configured as described above will be described.

When inserting the stimulable phosphor sheet 12 before recording the radiation image information into the radiation cassette 10, the operator directly operates the knobs 40a and 40b provided on the lid 16 or not shown. The lock means 32a and 32b are released by inserting the lock release pin into the holes 34a and 34b of the housing 14 in the loading device.

Further, when the lid 16 is opened relative to the housing 14 with the hinge 36 as a fulcrum, the opening 2 of the housing 14 is opened.
5 is opened, and the stimulable phosphor sheet 12 is inserted into the housing 14 through the opening 25. Then, when the lid 16 is pressed toward the housing 14, the locking claws 42 a and 42 b provided on the back surface of the lid 16 engage with the locking means 32 a and 32 b, and the lid 16 is Fixed to

The radiation cassette 10 containing the stimulable phosphor sheet 12 is loaded into an image recording device (not shown), and is irradiated with radiation including radiation image information of a subject (not shown) from the flat plate member 24 side of the radiation cassette 10. The radiation image information is recorded on the stimulable phosphor sheet 12.

By the way, in the above-mentioned radiation cassette 10, the weight of the patient is given to the radiation cassette 10 itself at the time of portable photographing or the like. In this case, in the present embodiment, as shown in FIG.
Metal plates 46a to 46c formed of a high-strength material such as SUS spring steel are attached to the inner surfaces of the a to 44c. For this reason, even if the weight of the patient directly acts on the radiation cassette 10, it is possible to reliably prevent the radiation cassette 10 from being deformed under the reinforcing action of the metal plates 46a to 46c. Can be

In particular, in this embodiment, the radiation cassette 1
It is only necessary to attach the metal plates 46a to 46c to the metal plate 0, and there is no problem that the cost is high and a scratch or the like is easily formed at the time of processing as in the conventional structure for preventing deformation by extruded aluminum metal. Unlike a structure in which elastic deformation is performed by integral molding, problems such as a rise in equipment costs and breakage of internal members due to deformation do not occur.

Although the present embodiment has been described using the stimulable phosphor sheet 12 as the radiation image recording carrier,
For example, a photographic film that directly records radiation image information of a subject by irradiating X-rays can be used as the radiation image recording carrier.

[0036]

In the radiation cassette and the method of manufacturing the same according to the present invention, since the resin frame is provided by burying the metal plate member arranged on the flat plate member, deformation due to molding shrinkage of the resin frame is prevented. The radiation can be reliably prevented via the metal plate member, and a high-quality radiation cassette having flatness can be efficiently manufactured.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a radiation cassette according to an embodiment of the present invention.

FIG. 2 is an explanatory perspective view of the radiation cassette;

FIG. 3 is an explanatory perspective view showing the inside of a light shielding plate constituting the radiation cassette;

FIG. 4 is a partially cutaway perspective explanatory view of a housing constituting the radiation cassette;

FIG. 5 is an exploded perspective view of a flat plate member and a metal plate member constituting the housing.

FIG. 6 is an explanatory perspective view when the metal plate member is attached to the flat plate member and placed in an injection molding machine in a state where the metal plate member is attached to the flat plate member.

FIG. 7 is an explanatory diagram when a press process is performed on the housing.

[Explanation of symbols]

REFERENCE SIGNS LIST 10 radiation cassette 12 stimulable phosphor sheet 12 a radiation irradiating surface 12 b back surface 14 housing 16 lid 18 light shielding plate 20 lead sheet 20 a free end 22 guide sheet 24 flat plate members 24 a to 24 d …
Ends 26a to 26c ... metal plate members 28a to 28d ...
Frame parts 32a, 32b ... Locking means 42a, 42b ...
Lock claws 44a-44c ... folding parts 46a-46c ...
Metal plate 70 ... Injection molding machine 80 ... Press machine

Claims (8)

[Claims] 1. A housing for accommodating a radiation image recording carrier, a light-shielding plate having a lid that is openably and closably attached to at least a part of the housing, and holding the radiation image recording carrier in a light-tight manner. And the housing includes a flat plate member to which radiation is applied from the outside, a metal plate member disposed at an inner surface edge of the flat plate member, and an end of the flat plate member embedded with the metal plate member. A radiation cassette, comprising: a resin frame unit integrally formed with the unit. 2. The radiation cassette according to claim 1, wherein
The radiation cassette, wherein the metal plate member has an L-shaped cross section. 3. The radiation cassette according to claim 1, wherein the flat plate member has four ends, and the other one except for one end that constitutes an opening for taking out the radiation image recording carrier. The radiation cassette, wherein the resin frame portion is integrally formed by embedding the metal plate member at one end. 4. The radiation cassette according to claim 1, wherein
A radiation cassette, wherein a fold portion that is bent toward the housing is provided at an end of the light shielding plate, and a reinforcing metal member is attached to an inner surface side of the fold portion. 5. A housing for accommodating a radiation image recording carrier, and a light-shielding plate having a lid that is openably and closably attached to at least a part of the housing and holding the radiation image recording carrier in a light-tight manner. A method of manufacturing a radiation cassette comprising: a step of arranging a metal plate portion on an inner surface edge of a flat member to which radiation is applied from the outside; and embedding the metal plate member and forming a resin on an end of the flat plate member. A method of manufacturing the casing by integrally forming a frame-making portion, a method of manufacturing a radiation cassette. 6. The method according to claim 5, wherein when the casing is deformed after the resin frame is integrally formed, the metal plate member is subjected to a press treatment to deform the casing. A method of manufacturing a radiation cassette, comprising a step of correcting a deformation of the radiation cassette. 7. The method according to claim 5, wherein the metal plate member is set to have an L-shaped cross section. 8. The method according to claim 5, wherein the flat plate member has four ends, and one end that constitutes an opening for taking out the radiation image recording carrier. The method of manufacturing a radiation cassette, wherein the resin frame portion is integrally formed with the other three end portions excluding the above.