JP4097123B2 - Optical film interposing method and optical cell block - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, when a scintillator cell or a light guide cell having a function of controlling an output wave height or a function of detecting a three-dimensional position of radiation in a scintillation radiation detector is sterically coupled, an optical film is efficiently interposed between the cells. It is related with the technique to wear.
[0002]
[Prior art]
As shown in FIG. 12, the scintillation radiation detector 50 includes a cell block 26 in which a large number of prismatic scintillator cells 22 made of GSO (Gd ₂ SiO ₅ ) or the like are integrated in a matrix form and a multilayer form. A position-sensitive photomultiplier tube (PS-PMT) 52 is optically coupled to the lower end surface of the cell block 26.
Therefore, when a gamma ray emitted from a specific part of the human body enters any one of the scintillator cells 22, the scintillator cell 22 emits light, and the position of the scintillator cell 22 emitted by the position sensitive photomultiplier tube 52 is determined. Detected.
If necessary, a light guide cell for forming a light guide path may be partially incorporated in the cell block 26 instead of the scintillator cell 22.
[0003]
Between each scintillator cell 22 or light guide cell, a reflective film made of a multilayer polymer resin is interposed for the purpose of eliminating interference from other cells or controlling the light transmission path. . Or a translucent film may be interposed instead of a reflective film as needed.
Below, the intervention procedure of the conventional optical film (reflective film or translucent film) is demonstrated.
First, as shown in FIG. 13, the optical film is cut into an elongated rectangular shape to form a plurality of partition plates 54. In one long side 54a of each partition plate 54, a plurality of slits (cuts) 56 are formed by laser processing at intervals corresponding to the pitch of the cells 22. The length of each slit 56 is set to half of the short side 54 b of the partition plate 54.
Next, the slits 56 of the plurality of partition plates 54 constituting the column side and the slits 56 of the plurality of partition plates 54 constituting the row side are arranged orthogonally, and the respective slits 56, 56 are bitten together, Is surrounded by a frame plate made of an optical film to form a lattice-like structure 58 shown in FIG.
Finally, the scintillator cell 22 and the light guide cell are sequentially loaded into the partitioned spaces 60 of the lattice structure 58.
[0004]
[Problems to be solved by the invention]
However, this conventional optical film interposing method has the following problems.
First, it takes time and labor to accurately bite a large number of slits 56 formed in each partition plate 54, and automation is also difficult, so that mass productivity is lacking.
In addition, after completing the lattice-like structure 58 first, the cells 22 are sequentially loaded into the partitioned spaces 60, and it is difficult to insert the cells 22 unless there is a certain margin in the dimensions of each partitioned space 60. Therefore, it is necessary to secure a useless gap 62 in advance.
[0005]
The present invention has been devised in order to solve the problems of the conventional optical film interposing method described above, and it is necessary to form a lattice-like structure by biting slits of the optical film in advance. In addition, an object of the present invention is to provide an optical film interposing method that does not require useless gaps in the divided space.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the optical film interposing method according to the present invention includes cutting a substrate of the optical film when interposing a resin-based optical film between a large number of integrated prismatic optical cells, forming required number of partition plate formed of the optical film with a shape and size required, a step of engraving the one or more folds in each of the partition plates described above, the partition plate along the fold line characterized in that it comprises bending the required direction, forming a bending partition plate made of an optical film having two or more reflective surfaces, and a step of placing each bending partition plates of the optically between cells It is said.
The optical cell block according to the present invention is an optical cell block in which a large number of prismatic optical cells are integrated, and a plurality of bent partition plates having two or more reflecting surfaces are interposed between the optical cells. Each bent partition plate is formed by engraving a crease line on a partition plate made of a resin-based optical film, and bending the partition plate in a necessary direction along the fold line. It is a feature.
[0007]
In this way, if the required number of bent partition plates having the required shape are formed by processing the optical film, the cell-like structure can be formed between the cells without having to form a lattice structure by combining the optical films in advance. An optical film can be interposed. At this time, since each bent partition plate has two or more surfaces, two or more surfaces of one cell are covered by one bent partition plate.
In addition, since it is possible to realize the interposition of the optical film and the arrangement of the cells at the same time, there is no need to secure a useless gap between each surface of the bent partition plate and each surface of the cell.
[0008]
The crease line is preferably formed by irradiating at least one surface of the partition plate with a laser beam. In general, it is difficult to fold a rigid multilayer polymer reflective film at right angles without a crease, but it is finely cut by forming an accurate crease line by laser beam irradiation as described above. It is possible to bend the reflected film with an accuracy of micron.
More specifically, a groove (non-through hole) can be formed in a continuous line shape by irradiating at least one surface of the partition plate with a laser beam, thereby forming the crease line.
Alternatively, at least one surface of the partition plate may be irradiated with a laser beam to form a groove (non-through hole) or a through hole in a dotted line shape, thereby forming the crease line.
The type of the laser beam used here is not particularly limited, and an excimer laser, a third harmonic of YAG, and the like can be widely applied in addition to the TEA-CO ₂ laser.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a plan view showing a processing example of an optical film according to the present invention.
First, the surface of the resin-based reflective film substrate 10 is irradiated with a laser beam, and the partition plate 14 is cut into a rectangular shape along the cutting line 12.
Further, the surface of each partition plate 14 is irradiated with a laser beam to form a plurality of crease lines 16.
[0010]
Next, as shown in FIG. 2, the bent partition plate 18 is formed by bending each cut-out partition plate 14 at a right angle along the crease line 16. At this time, by changing the folding direction for each crease line 16, the bent partition plate 18 is provided with a continuous body of triangular waves.
1 and 2 illustrate the six reflecting surfaces 20 and the bent partition plate 18 having three triangular waves, the number of reflecting surfaces and triangular waves is not limited.
[0011]
FIG. 3 shows a state in which prismatic scintillator cells 22 are arranged in a 6 × 6 matrix by using the bent partition plate 18 having such a structure, and a reflective film is interposed between the cells 22. Is shown.
In this case, a bent partition plate having the following configuration is prepared in advance.
(1) Two-sided bending partition plate 18a with two reflecting surfaces (number of triangular waves: 1) ... 2 pieces
(2) Four reflective bent plates 18b with two reflective surfaces (number of triangular waves: 2) ... 2
(3) 6-sided bending partition plate 18c with 6 reflective surfaces (number of triangular waves: 3) 2 ...
(4) Eight-sided bending partition plate 18d with two reflecting surfaces (number of triangular waves: 4) ... 2
(5) 10-sided bending partition plate 18e with 10 reflective surfaces (number of triangular waves: 5) ... 2 pieces
(6) Two-sided bent partition plate 18f with two reflecting surfaces (number of triangular waves: 2) ... 2 Of these, in the case of bent partition plates 18a to 18e of (1) to (5), The reflecting surface 20 has a size corresponding to one side surface of the cell 22. Further, in the case of the bent partition plate 18f of (6), the reflecting surface 20 has the dimensions of the six surfaces of the cell 22 because it is for forming an outer frame.
[0012]
First, as shown in the figure, the inner corners of a pair of outer frame forming bent partition plates 18f and 18f are arranged opposite to each other, and 6 × 6 cells 22 and the bent partition plates 18a to (5) of (1) to (5) are interposed therebetween. 18a is placed. At this time, an appropriate pressure-sensitive adhesive or adhesive is filled between the cell 22 and the bent partition plates 18a to 18f as necessary.
Next, by bringing the outer frame forming bent partition plates 18f and 18f closer to the inside, the cells 22 arranged between them and the other bent partition plates 18a to 18e are closely fixed.
As a result, as shown in FIG. 4, one layer of cell blocks 24 having almost no useless gaps is formed between the cells 22 and the bent partition plate 18. By stacking the cell blocks 24 vertically, the multilayer cell block 26 shown in FIG. 12 can be obtained.
[0013]
As described above, since the fold line 16 is formed in advance on each partition plate 14, the folding process can be facilitated.
In addition, since the interposition of the bent partition plate 18 and the arrangement of the cells 22 can be realized in parallel, there is no need to secure a useless gap between the reflecting surface 20 of the bent partition plate 18 and the cells 22. The space factor of block 24 is improved.
FIG. 3 shows an example in which various types of bent partition plates 18a to 18f are prepared, and by efficiently devising these arrangements, the bent partition plates are efficiently interposed so that no overlapping portions are generated. However, there is practically no problem even if overlapping portions occur partially by using a limited type of bent partition plate.
[0014]
Next, a method for forming the crease line 16 will be described with reference to FIG.
In this case, a groove as a crease line 16 is formed on the reflective film by irradiating the surface of the reflective film substrate 10 having the protective film 28 on the back surface with a laser beam L in a predetermined pattern. Form 30.
The groove 30 is stopped halfway in the thickness direction of the reflective film substrate 10. On the other hand, the through hole 32 constituting the cutting line 12 passes through the reflective film base 10 and reaches the protective film 28.
Specifically, the cutting line 12 and the crease line 16 can be distinguished by adjusting the number of shots of the laser beam L or adjusting the output.
[0015]
Next, another method of forming the crease line 16 will be described with reference to FIG.
In this case, a laser beam is intermittently irradiated in a predetermined pattern onto the surface of the reflective film substrate 10 with the protective film 28 attached to the back surface, and the grooves 34 are formed in a dotted line (sewing machine) on the reflective film substrate 10. The crease line 16 is formed by engraving in the shape of a mesh.
The groove 34 is also stopped in the middle of the thickness direction of the reflective film.
On the other hand, as shown in FIG. 7, the crease line 16 can be formed by forming the through hole 36 in a dotted line shape.
[0016]
Next, another method for forming the crease line 16 will be described with reference to FIG.
In this case, after the protective film 28 on the back surface is peeled off, the reflective film substrate 10 is irradiated with a laser beam L in a predetermined pattern on the corresponding positions on both surfaces of the reflective film substrate 10, thereby forming the fold line 16 on the reflective film substrate 10. The groove portion 38 is formed in a dotted line shape or a continuous line shape.
At this time, the groove portion 38 formed on the front surface side and the groove portion 38 formed on the back surface side are not opened, and the partition wall portion 40 remains between them.
Alternatively, as shown in FIG. 9, the irradiation position of the laser beam L can be shifted between the front surface and the back surface of the reflective film substrate 10. In this case, the groove portion 42 formed on the front surface side and the groove portion 42 formed on the back surface side constitute separate crease lines 16 having different bending directions. That is, the crease line 16 formed on the front surface side is used when the partition plate 14 is folded in the A direction, and the crease line 16 formed on the back surface side is used when the partition plate 14 is folded in the B direction.
[0017]
In the above, the partition plate 14 is cut out from the reflective film substrate 10 into a simple rectangular shape, and the bent partition plate 18 with a triangular wave is formed by folding the partition plate 14 along the crease line 16 Although an example has been described, more complicated shapes can be handled by applying the processing method according to the present invention.
For example, as shown in FIG. 10, when the five surfaces around the scintillator cell 22 are covered with a reflective film, the reflective film substrate 10 is cut into a shape and size corresponding to each surface of the cell in the past. It was necessary to affix each section individually to each surface of the cell 22, which required extremely complicated work.
[0018]
On the other hand, as shown in FIG. 11, a reflection film can be easily applied to the cell 22 by preparing a partition plate 14 having a rectangular portion 44 covering the side surface of the cell 22 and a square portion 46 covering the top surface. It becomes possible to attach to.
That is, the rectangular portion 44 has a shape and dimensions corresponding to the four side surfaces of the cell 22, and the crease line 16 is formed at a position corresponding to each surface. The square portion 46 has a shape and dimensions corresponding to the top surface of the cell 22, and a crease line 16 is also formed between the rectangular portion 44 and the square portion 46.
[0019]
Therefore, the rectangular portion 44 is bent at right angles along the crease lines 16, and the square portion 46 is bent at right angles along the crease lines 16, thereby forming a box-shaped bent partition plate 18. By covering the cell 22, the surface of the cell 22 excluding the bottom surface is surrounded by the reflective film, and the reflective film can be interposed between adjacent cells.
[0020]
Usually, resin-based reflective films are difficult to bend, and especially when the dimensions are small, it is impossible to accurately fold them into complex shapes, but it is necessary to form crease lines 16 beforehand by laser processing as described above. Therefore, it can be easily bent. Further, the position accuracy of the crease line can be adjusted to the same accuracy as the laser processing, and the same assembly accuracy can be ensured for the interposition of the optical film.
[0021]
In the above description, the example in which the crease line 16 is formed by irradiating the surface of the reflective film substrate 10 with a laser beam has been described, but the present invention is not limited to this.
That is, a groove similar to the above can be formed using other processing techniques such as press processing and cutting, and this can be used as a crease line.
Moreover, although the example which processes a reflective film was demonstrated in the above, naturally it is also possible to apply to the process of a translucent resin film and other resin films.
[0022]
【The invention's effect】
According to the method for interposing an optical film according to the present invention, a required number of bent partition plates made of an optical film having a necessary shape are formed by processing the optical film , and each bent partition plate is interposed between cells. Since this is a method of mounting, the optical film can be easily interposed between the cells, and automation is facilitated even if the lattice structure is not formed by combining the optical films in advance.
In addition, since it is possible to realize the interposition of the optical film and the arrangement of the cells at the same time, there is no need to secure a useless gap between each surface of the bent partition plate and each surface of the cell.
The dimensional accuracy of the scintillator block or light guide and the light receiving element is 10 μm or less. However, if the crease line is formed by laser processing, the same assembly accuracy can be ensured for the interposition of the optical film.
[Brief description of the drawings]
FIG. 1 is a plan view showing a processing example of a reflective film substrate according to the present invention.
FIG. 2 is a perspective view showing a bent partition plate.
FIG. 3 is a schematic diagram showing a state in which a bent partition plate is interposed between scintillators and cells.
FIG. 4 is a plan view showing a state in which a cell block is formed by interposing a bent partition plate between the scintillator and the cell.
FIG. 5 is a perspective view showing an example of a method of forming a crease line.
FIG. 6 is a perspective view showing another method of forming a crease line.
FIG. 7 is a perspective view showing another method of forming a crease line.
FIG. 8 is a cross-sectional view showing another method of forming a crease line.
FIG. 9 is a cross-sectional view showing another method of forming a crease line.
FIG. 10 is a perspective view showing a state where five surfaces around the scintillator cell are covered with a reflective film.
FIG. 11 is a plan view showing a partition plate provided with a rectangular portion covering the side surface of the cell and a square portion covering the top surface.
FIG. 12 is a perspective view showing the appearance of a scintillation radiation detector.
FIG. 13 is a perspective view showing a conventional procedure for interposing an optical film.
FIG. 14 is a plan view showing a conventional procedure for interposing an optical film.
[Explanation of symbols]
10 Reflective film substrate
12 Cutting line
14 Partition plate
16 Crease line
18 Bent divider
20 Reflecting surface
22 Scintillator cell
24 cell block
26 Multi-layer cell block
30 Groove
32 Through hole
34 Groove
36 Through hole
38 Groove
40 Bulkhead
42 Groove
44 Rectangular part
46 square

Claims (5)

In placing a resin optical film between a large number of integrated prismatic optical cells,
Cutting the substrate of the optical film, forming a required number of partition plates made of an optical film having the necessary shape and dimensions; and
A step of engraving the one or more folds in each of the partition plates described above,
A step of bending the partition plate in a necessary direction along the crease line, and forming a bent partition plate made of an optical film having two or more reflecting surfaces;
A step of placing each bending partition plates of the optically between cells,
A method for interposing an optical film, comprising:   The optical film interposing method according to claim 1, wherein the crease line is formed by irradiating at least one surface of the partition plate with a laser beam.   3. The method for interposing an optical film according to claim 2, wherein a groove is formed in a continuous line by irradiating at least one surface of the partition plate with a laser beam, thereby forming the crease line.   The optical film interposing method according to claim 2, wherein at least one surface of the partition plate is irradiated with a laser beam to form a groove or a through hole in a dotted line shape, thereby forming the crease line. An optical cell block in which a large number of prismatic optical cells are integrated,
Between each optical cell, a plurality of bent partition plates having two or more reflecting surfaces are interposed,
Each bent partition plate is formed by forming a crease line on a partition plate made of a resin-based optical film, and bending the partition plate in a necessary direction along the crease line. block.

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