JP3836041B2 - X-ray analyzer collimator holder - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a collimator holder for detachably fixing a collimator of an X-ray analyzer.
[0002]
[Prior art]
FIG. 7 is a sectional view of a conventional collimator holder as viewed from the axial direction of the collimator. The first support surface (vertical surface) 12 and the second support surface (horizontal surface) 14 of the collimator holder 10 are orthogonal to each other, and the cylindrical outer peripheral surface of the collimator 16 contacts these support surfaces 12 and 14. Yes. The collimator 16 is detachably fixed by pressing the collimator 16 against the two support surfaces 12 and 14 with a leaf spring 18. To remove the collimator 16, the collimator 16 is taken out in the direction of the arrow 20 while lifting the tip of the leaf spring 18. To attach another collimator, the collimator 16 is inserted from the direction opposite to the arrow 20 while lifting the tip of the leaf spring 18.
[0003]
[Problems to be solved by the invention]
The conventional collimator holder described above has the following problems. (1) The collimator attachment / detachment direction is limited to one direction. In the conventional example of FIG. 7, the collimator can be attached and detached only from the horizontal direction. Depending on the arrangement of the structures around the collimator and the posture of the worker, it may be easier to attach and detach the collimator in the vertical direction, but this is not possible with the conventional example of FIG. (2) It takes time to attach and detach the collimator. In the conventional example of FIG. 7, since the collimator 16 is removed and inserted with the other hand while the leaf spring 18 is lifted with one hand, it is necessary to use both hands. However, if the space around the collimator 16 is narrow, it may not be easy to use both hands. Even if a screwing method is used instead of the leaf spring method, it is necessary to loosen or tighten the screw. (3) A large force is applied to the collimator holder when the collimator is attached or detached. In the conventional example of FIG. 7, when the leaf spring 18 is lifted upward, an upward force is applied to the collimator holder. Further, when the collimator 16 is pulled out in the direction of the arrow 20, if the collimator 16 pushes the tip of the leaf spring 18 to the upper right, a rightward force acts on the collimator holder. If a large force is applied to the collimator holder, the positioning accuracy of the collimator holder may be shifted. If the elastic restoring force of the leaf spring 18 is weakened, a large force is not applied to the collimator holder, but in this case, there is a possibility that the reproducibility of the collimator mounting position cannot be ensured.
[0004]
The present invention has been made to solve the above-described problems, and its purpose is not to limit the attaching / detaching direction of the collimator, the attaching / detaching operation is easy, and a large force is applied to the collimator holder during attaching / detaching. An object of the present invention is to provide a collimator holder for an X-ray analyzer that does not work.
[0005]
[Means for Solving the Problems]
The collimator holder of the X-ray analyzer of the present invention includes the following (a) to (d) and has the characteristics (e) and (f) . (A) A first support surface and a second support surface that can contact the cylindrical outer peripheral surface of the collimator and are orthogonal to each other. (B) A corner magnet that is embedded in a corner where the first support surface and the second support surface intersect, and attracts the collimator toward the corner by a magnetic force. (C) A first support surface magnet embedded in the first support surface and attracting the collimator toward the first support surface with a magnetic force. (D) A second support surface magnet embedded in the second support surface and attracting the collimator toward the second support surface with a magnetic force. (E) The magnetic pole surface of the first support surface magnet is retracted from the first support surface, the magnetic pole surface of the second support surface magnet is retracted from the second support surface, and the first support surface is The magnet and the second support surface magnet do not contact the outer peripheral surface of the collimator. (F) The number of the first support surface magnets and the second support surface magnets is two, respectively, the distance between the two first support surface magnets in the axial direction of the collimator, and the axial direction of the collimator The distance between the two second support surface magnets is different.
[0007]
By the way, in the technical field of the X-ray analysis apparatus, there is no conventional example in which the collimator is detachably fixed by a magnet, but there is a conventional example of a magnet fixing type for fixing a sample holder or the like. For example, Japanese Patent Application Laid-Open No. 7-294400 describes a technique for detachably fixing a sample holder of an X-ray diffraction apparatus with a magnet. Japanese Patent No. 3003525 describes a technique for detachably fixing a crystal holding frame of a fluorescent X-ray analyzer with a magnet. However, these magnet fixing type attachment / detachment devices do not disclose disposing a magnet as in the present invention in relation to two orthogonal support surfaces.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1A is a perspective view of a first embodiment of the present invention. The collimator holder 30 includes a first support surface 32 (vertical surface) and a second support surface 34 (horizontal plane). The two support surfaces 32, 34 are orthogonal to each other at the corner 36. Two corner magnets 38 and 39 are embedded in the corner 36, and these are arranged at intervals in the axial direction of the collimator. Two first support surface magnets 40 and 41 are embedded in the first support surface 32, and these magnets are arranged at intervals in the axial direction of the collimator. Two second support surface magnets 42 and 43 are embedded in the second support surface 34, and these magnets are arranged at intervals in the axial direction of the collimator. Eventually, a total of six magnets are embedded in the collimator holder 30.
[0009]
FIG. 1B is a perspective view showing a state in which the collimator 44 is detachably fixed to the collimator holder 30. The collimator 44 is drawn with imaginary lines. The collimator 44 can be positioned in the axial direction by bringing the base end 45 of the collimator 44 into contact with a stopper (not shown).
[0010]
FIG. 2 is a plan view of the collimator holder 30 of FIG. FIG. 3A is a cross-sectional view taken along line AA in FIG. ing. The shape of the first support surface magnet 40 is a cylindrical shape having a diameter of 3 mm and a length of 4 mm. The material is a rare earth magnet, for example, a neodymium magnet (Nd—Fe—B). The magnet used in the embodiment has a surface magnetic flux density of 3500 gauss and is quite strong. The magnetic pole surface 46 of the first support surface magnet 40 is retracted from the first support surface 32 by a slight gap G (for example, 0.1 to 0.2 mm). Therefore, the first support surface magnet 40 does not contact the outer peripheral surface of the collimator 44.
As clearly shown in FIG. 2, the distance between the two first support surface magnets 40 and 41 in the axial direction (vertical direction in FIG. 2) of the collimator 44 (see FIG. 1B) is This is different from the distance between the two second support surface magnets 42 and 43 in the axial direction of the collimator. That is, the former distance is shorter than the latter distance.
[0011]
The rear end of the first support surface magnet 40 is bonded to the front end of the first set screw 48. The first set screw 48 is screwed into a screw hole formed in the collimator holder 30. By adjusting the screwing amount of the first set screw 48, the gap G can be set to a predetermined value. When the predetermined gap G can be set, an adhesive is filled in the screw hole on the rear end side of the first set screw 48, and the first set screw 48 is fixed inside the screw hole.
[0012]
The shape and material of the second support surface magnet 42 are the same as those of the first support surface magnet 40. The magnetic pole surface 50 of the second support surface magnet 42 is also retracted from the second support surface 34 by a predetermined gap G and does not contact the outer peripheral surface of the collimator 44. The second support surface magnet 42 is also bonded to the second set screw 52. Adjustment with the second set screw 52 and filling of the adhesive after adjustment are the same as in the case of the first set screw 48.
[0013]
The outer peripheral surface of the collimator 44 is a cylindrical surface, and when the collimator 44 is set in the collimator holder, the outer peripheral surface of the collimator 44 comes into contact with the first support surface 32 and the second support surface 34. The material of the collimator 44 is made of a ferromagnetic material (for example, ferromagnetic stainless steel such as SUS420) so that it can be attracted by a magnet. The first support surface magnet 40 attracts the collimator 44 toward the first support surface 32 with a magnetic force. The second support surface magnet 42 attracts the collimator 44 toward the second support surface 34 with a magnetic force.
[0014]
FIG. 3B is a cross-sectional view taken along line BB in FIG. This drawing shows a state in which the corner magnet 39 is embedded in the corner 36 (see FIG. 1). The shape and material of the corner magnet 39 are the same as those of the first support surface magnet 40, and the function of the third set screw 54 is the same as that of the first set screw 48. The axis of the corner magnet 39 forms an angle of 45 degrees with respect to each of the first support surface 32 and the second support surface 34. The position of the magnetic pole surface 55 of the corner magnet 39 is set so as to be separated from the outer peripheral surface of the collimator 44 by a slight gap G. The corner magnet 39 acts to attract the collimator 44 toward the corner 36 (see FIG. 1) with a magnetic force.
[0015]
Next, the operation of the above three types of magnets will be described. 3A and 3B, in order to fix the collimator 44 to the collimator holder 30 in a detachable manner and with good position reproducibility, the outer peripheral surface of the collimator 44 is the first. It is necessary to closely contact both the support surface 32 and the second support surface 34. For this purpose, both a force for attracting the collimator 44 toward the first support surface 32 (a rightward force in FIG. 3) and a force for attracting the collimator 44 toward the second support surface 34 (a downward force in FIG. 3) are required. Become. The first support surface magnet 40 plays a role of generating the former force, and the second support surface magnet 42 plays a role of generating the latter force. On the other hand, the corner magnet 39 plays a role of generating both of the above-described forces. That is, the corner magnet 39 attracts the collimator 44 in the lower right direction in FIG. 3, and the horizontal component force attracts the collimator 44 to the first support surface 32, and the vertical component force attracts the collimator 44 to the second support surface 34. Will be attracted to. Considering the above points, both the above-described forces can be generated only by the “combination of the first support surface magnet and the second support surface magnet”, and therefore the corner magnet can be omitted. Further, since both of the above-described forces can be generated only by the corner magnets, the “combination of the first support surface magnet and the second support surface magnet” can be omitted. According to the experiment, when the “combination of the first support surface magnet and the second support surface magnet” and the “corner magnet” were used in combination, the collimator could be attracted and fixed with the best position reproducibility. The first embodiment shown in FIG. 1 realizes such an ideal embodiment.
[0016]
FIG. 8A is a perspective view of a reference example , omitting the corner magnets, and using only the combination of the first support surface magnets 40 and 41 and the second support surface magnets 42 and 43. In the case of this reference example , if the balance between the magnetic force by the first support surface magnet and the magnetic force by the second support surface magnet is not adjusted well, the collimator may be lifted from either of the support surfaces 32 and 34. is necessary.
[0017]
On the other hand, FIG. 8B is a perspective view of another reference example , in which the first support surface magnet and the second support surface magnet are omitted and only the corner magnets 38 and 39 are used. When the magnetic force by the corner magnet is strong, the collimator can be stably brought into close contact with the two support surfaces 32 and 34 only by this.
[0018]
Next, although not directly related to the collimator holder, a beam stopper holder attached to the collimator will be described. 4 is a perspective view of the beam stopper holder, FIG. 5 is a side view thereof, and FIG. 6 is a front view thereof. In FIG. 4, the beam stopper holder 56 is configured such that the beam stopper 66 can be attached to and detached from the cylindrical outer peripheral surface of the collimator 44 by a clamp method. The beam stopper holder 56 mainly includes a mounting base 58, a sandwiching plate 60, two torsion coil springs 62, a first support arm 82, a second support arm 84, and a beam stopper 66.
[0019]
As shown in FIG. 6, the mounting base 58 includes a first mounting surface 68 and a second mounting surface 70, and the mounting surfaces 68 and 70 are orthogonal to each other. The beam stopper holder 56 can be mounted on the collimator 44 by bringing the two mounting surfaces 68 and 70 of the mounting base 58 into contact with the outer peripheral surface of the collimator 44 and sandwiching the collimator 44 with the sandwiching plate 60 from the opposite side. . A boss portion 76 is fixed to the sandwiching plate 60, and the boss portion 76 can rotate around the shaft 78. The sandwiching plate 60 receives an elastic force that rotates in the direction of arrow 72 (counterclockwise in FIG. 6) by the torsion coil spring 62, and the mounting base 58 can be firmly fixed to the collimator 44 by this elastic force. A flexible pad 74 is affixed to the portion of the sandwiching plate 60 that contacts the collimator 44 to ensure contact between the sandwiching plate 60 and the collimator 44.
[0020]
As shown in FIG. 4, the shaft 78 is inserted into a pair of brackets 80 of the mounting base 58. A boss portion 76 of the sandwiching plate 60 and two torsion coil springs 62 are attached to the shaft 78.
[0021]
As shown in FIG. 6, the base end of the first support arm 82 is fixed to the mounting base 58 with two screws 83. As shown in FIG. 4, the tip of the first support arm 82 is bent at a right angle so as to be perpendicular to the axis of the collimator 44, and the base end of the second support arm 84 is at the tip of the bent portion 86. It is fixed with two screws 85. The second support arm 84 bends at right angles immediately from the vicinity of the base end thereof, and a beam stopper 66 is fixed to the tip thereof. The position of the beam stopper 66 is set to a position where the X-ray beam emitted from the collimator 44 just hits if there is no sample (the X-ray irradiation position of the sample is indicated by reference numeral 88). As shown in FIG. 5, the position of the beam stopper holder 56 in the axial direction can be positioned by pressing the left end of the mounting base 58 against the stepped portion 59 on the outer peripheral surface of the collimator 44.
[0022]
FIG. 9 is a perspective view of a conventional beam stopper holder 90. The beam stopper holder 90 can attach the beam stopper 66 to the collimator 44 by covering the mounting ring 92 on the collimator 44 from the direction of the arrow 94 and tightening the fixing screw 96. In such a configuration, if an accessory device (for example, a nozzle of a cryogenic device) is arranged around the sample, it is necessary to remove the collimator 44 from the support base and attach a beam stopper holder to the collimator 44. was there. On the other hand, the beam stopper holder 56 of the clamp type as shown in FIG. 4 can easily attach the beam stopper 66 from the side of the collimator 44 with the collimator 44 as it is.
.
[0023]
【The invention's effect】
The collimator holder according to the present invention employs two support surfaces orthogonal to each other and magnets arranged in a predetermined manner in relation to these support surfaces, so that the attachment / detachment direction of the collimator is not limited and the attachment / detachment work is easy. In addition, there is an effect that a large force does not act on the collimator holder when attaching and detaching.
[Brief description of the drawings]
FIG. 1 is a perspective view of a first embodiment of the present invention.
FIG. 2 is a plan view of the collimator holder of FIG.
3A is a cross-sectional view taken along line AA in FIG. 2, and FIG. 3B is a cross-sectional view taken along line BB in FIG.
FIG. 4 is a perspective view of a beam stopper holder.
FIG. 5 is a side view of the beam stopper holder of FIG. 4;
6 is a front view of the beam stopper holder of FIG. 4. FIG.
FIG. 7 is a cross-sectional view of a conventional collimator holder as viewed from the axial direction of the collimator.
8A is a perspective view of a reference example , and FIG. 8B is a perspective view of another reference example .
9 is a perspective view of a conventional beam stopper holder 90. FIG.
[Explanation of symbols]
30 Collimator holder 32 First support surface 34 Second support surface 36 Corners 38, 39 Corner magnets 40, 41 First support surface magnets 42, 43 Second support surface magnet 44 Collimator

Claims (1)

A collimator holder for an X-ray analyzer having the following features (a) to (d) and having the features (e) and (f) :
(A) A first support surface and a second support surface that can contact the cylindrical outer peripheral surface of the collimator and are orthogonal to each other.
(B) A corner magnet that is embedded in a corner where the first support surface and the second support surface intersect, and attracts the collimator toward the corner by a magnetic force.
(C) A first support surface magnet embedded in the first support surface and attracting the collimator toward the first support surface with a magnetic force.
(D) A second support surface magnet embedded in the second support surface and attracting the collimator toward the second support surface with a magnetic force.
(E) the magnetic pole surface of the first support surface magnet is retracted from the first support surface, and the magnetic pole surface of the second support surface magnet is retracted from the second support surface; The magnet and the second support surface magnet do not contact the outer peripheral surface of the collimator.
(F) The number of the first support surface magnets and the second support surface magnets is two, respectively, the distance between the two first support surface magnets in the axial direction of the collimator, and the axial direction of the collimator The distance between the two second support surface magnets is different.

Images