JPS5863932A - X-ray photograph cassette - Google Patents

Abstract

PURPOSE:To improve close contact between a film and a sensitizing paper and to facilitate the extraction of the film after photographing, by using an elastic matter bent to be convex at inside of a surface plate, and a rigid matter bent to be convex at inside of a rear cover respectively. CONSTITUTION:A surface plate 1 opposite to an X-ray source is formed with an elastic matter bent to be convex at inside; while a rear cover 3 is formed with a rigid matter bent to be convex at inside. The sensitizing papers 4 and 5 are stuck on the inside surfaces of the plate 1 and the cover 3 respectively. Them a film 6 is held between the papers 4 and 5, and the cover 3 is closed. The plate 1 is bent to be convex outside along the inner convex surface of the cover 3. Thus a close contact is secured among the papers 4 and 5 and the film 6. The plate 1 is bent to be convex inside with its restoring elasticity when the cover 3 is closed. As a result, a gap is produced between the fringe of the film 6 and the paper 4. Thus the film 6 can be easily extracted.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an X-ray photographic cassette (hereinafter simply referred to as a "cassette") that includes an intensifying screen and a film accommodated in close contact with the intensifying screen in X@photography.

A conventional cassette has a top plate made of aluminum or Bakelite that faces the X-ray source, a frame made of aluminum or steel provided around the periphery of the top plate, and a flat box-like body together with the top plate and the frame. It consists of an aluminum or steel back cover, and an intensifying screen is attached to the inner surface of the front plate and back cover, and a film is loaded between these two intensifying screens to take X-ray photographs. Ru.

The main conditions required for the cassette are 1) intensifying screen and Z
Good adhesion with the ilm.

2) The top plate in particular has low X-ray absorption and uneven absorption of X-rays, 3) It is lightweight, and 4) It has sufficient mechanical strength to withstand repeated use. If the snow intensifying screen and the film inside the cassette are not in perfect contact with each other, when the photo is processed after photography, blurring will occur in the areas with poor contact, making the image unclear. Many attempts have been made to improve the cassette to improve the adhesion between the photosensitive paper and the film.

However, the front surface of conventional cassettes is either flat or curved outward to ensure good contact between the intensifying screen and the film. When you open the lid and try to take out the film that has been shot from inside, the film is attached to the inside surface of the cassette top plate around the intensifying screen. The disadvantage is that the extraction operation is complicated.

The present invention has been made in view of the above-mentioned circumstances, and it is an object of the present invention to provide a cassette that has good adhesion between an intensifying screen and a film when in use, and allows for easy removal of the film after use. The purpose is to

The cassette of the present invention has a top plate facing an X-ray source, a frame provided on the periphery of the top plate, and a box-shaped back facing the top plate, which is attached so as to be openable and closable. In the X-ray photographic cassette comprising a lid, the back cover is made of a rigid body curved to be convex inward, and the front plate is curved to be convex inward when the back cover is open. The device is characterized in that it is made of an elastic body that is pressed outward by the back cover and curves outwardly only when the back cover is closed.

The top plate is preferably made of plastic reinforced with an aromatic polyamide fiber material or a carbon fiber material.

In this way, in the cassette of the present invention, when the back cover is closed, the elastic top plate, which is convex inward when the back cover is opened, is pushed outward by the back cover. Because the inner curved surface is convex on the inside and curves to become convex on the outside, and since the top plate has elasticity so that it is always convex on the inside, the pressure bonding elasticity that goes inward makes the top plate and The back plate is tightly adhered, and the two intensifying screens attached to the inside of the front and back plates and the film pushed between these intensifying screens have extremely good adhesion when loading the film. In addition, when opening the back cover and taking out the film after taking an X-ray photograph, the front plate becomes convex inward due to its restoring elasticity, so there is a gap between the film and the intensifying screen at the periphery of the film and the intensifying screen. A gap is created between the two, making it extremely easy to take out the film.

In the following, the invention will be explained in detail with reference to one embodiment shown in the drawing.

Figure 1 is an 8+ diagram showing the state in which the intensifying screen and film are loaded into the cassette of the present invention and the back cover is open, and Figures 2 and 3 are A-8+ diagrams showing the state in which the back cover is open. - A cross-sectional view taken along A-A plane and a cross-sectional view taken along A-A plane showing the case back in a closed state.

In the cassette of the present invention, a frame body 2 made of aluminum or steel is provided at the peripheral edge of a top plate 1 made of an elastic body,
Further, a back cover 3 made of plastic, aluminum, steel, etc. is attached to the frame 2 via a butterfly plate 8 so as to be openable and closable, and the front plate 1, frame 2, and back cover 3 form a flat box. For the top plate 1, we use an elastic body that does not undergo plastic deformation even if it is deformed by applying an external force, and can immediately return to its original shape by its own restoring elasticity when the external force is removed.
This is arranged so as to be curved inwardly, and an intensifying screen 4 is attached to the inner surface of this top plate 1. At this time, it is desirable that the top plate be curved with a radius of curvature of 100 to 200 cm. In this embodiment, as shown in FIG. 1, the top plate 1 is curved only in the A-A direction, but for example, it is curved in both the A-A direction and the B-B direction. may be a spherical convex. On the other hand, the back cover 3 is designed to have good adhesion between the intensifying screen and the film (in order to improve the adhesion between the intensifying screen and the film, the entire back cover 3 is curved so that it is convex inward, or the center part is thickened so that the inside is convex). to back cover 3
A cushioning material 7 made of felt, sponge, etc. having a cushioning effect is pasted on the inner surface of the screen, and another intensifying screen 5 is pasted thereon. A partition plate lO is provided on the inside of the frame 2 around the inside of the front plate l, so that when the back cover 3 is closed and fixed to the frame 2, the peripheral protrusion 3a of the back cover 3 is connected to the frame 2. The gap between the frame body 2 and the back cover 3 is more completely shielded from light by fitting into a groove 11 formed between the frame body 2 and the back cover 3.

As the top plate of the cassette of the present invention, any highly elastic material with a high elastic limit can be used, but in order to obtain a cassette with low X-ray absorption, light weight, and excellent mechanical strength, aromatic It is preferable to use so-called fiber-reinforced plastics such as phenol resins, unsaturated polyester resins, epoxy resins, and polyimide resins reinforced with polyamide fibers, carbon fibers, etc. Furthermore, since the back cover of the cassette of the present invention does not need to deform under pressure from the top plate, there is no particular restriction on the material of the material as long as it does not deform even when external force is applied to it, but it must be lightweight and It is preferable to use fiber-reinforced plastic that is thicker than the top plate in terms of mechanical strength.

In use, the film 6 is held between the intensifying screens 4 and 50, the back cover 3 is closed, and the back cover 3 is fixed to the frame 2 with the stopper 9. When the back cover 3 is fixed to the frame 2, the top plate 1 made of an elastic material is pressed against the inner convex surface of the back cover 3 and curves outward to become convex, as shown in FIG. Therefore, the intensifying screen 4 is not only in the center of the cassette but also in the periphery.
And the adhesion between 5 and the film 6 is improved. Also, after shooting, when the back cover 3 of the cassette is opened (and the pressure from the back cover 3 is no longer applied to the front plate 1, the front plate 1 made of an elastic material has its restoring elasticity, as shown in Figure 2) With re-laces,
Since it curves inwardly, a gap is created between the film 6 and the intensifying screen 4 at the periphery of the film 6.
The film can be taken out very easily.

In particular, when loading and unloading film into a cassette using an automatic film refilling device that automatically loads and unloads film into the cassette and unloads the film from the cassette without manual intervention, this method is more effective than the conventional cassette. Using the cassette described above is extremely advantageous because it reduces problems such as errors in taking out the film.

In this way, when the cassette of the present invention is in use, the back cover, which is convex inward, presses the top plate, which has restoring elasticity and is convex inward, outward, resulting in a convex shape along the back cover. Since the film is curved in this way, the intensifying screen and the film l are in good contact, and a clear X-ray photograph can be obtained on the entire surface of the film.At the same time, when taking out the film after using the cassette, the cassette top plate is curved in the opposite direction from when it is used. With this construction, a gap is created between the intensifying screen and the film at the periphery of the intensifying screen, making it much easier to take out the film compared to conventional cassettes.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a perspective view of a cassette according to an embodiment of the present invention, with the back cover open.
FIG. 2 is a sectional view taken along the line A--A in the figure; FIG. 2 shows the cassette with the back cover open, and FIG. 3 shows the cassette with the back cover closed. 1......Table board 2...
・・・・・・・・・Frame Body 3・・・・・・・・・
・・Back cover 5 ・・・Intensifying paper 6
・・・・・・・・・・・・・・・Film 7...
・・・・・・・・・・・・Cushion material 8・・・・・・
・・・・・・Butterfly board 9・・・・・・・・・・・・
・Stopper 1 ()・・・・・・・・・Partition plate Fig. 1 Fig. 3

Claims (2)

[Claims] (1) A top plate facing the X-ray source, a frame provided on the periphery of this top plate, and a box-shaped front facing the top plate, with a front covered with V-shaped panels that can be opened and closed. The back cover is made of a rigid body that is curved inwardly, and the top plate is inwardly convex when the back cover is open. An X-ray photograph cassette characterized in that the X-ray photograph cassette is made of an elastic body which is curved so that the back cover is closed, and which is pressed outwardly by the back cover and curves to become convex to the outside. (2) The X-ray photographic cassette according to claim 1, wherein the top plate is made of a plastic reinforced with an aromatic polyamide NiTM material or a carbon fiber material.