JP2007037203A - Shaft type linear motor and radiation image reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To alter the size of a moving member through a simple arrangement, and to manufacture a coil while arranging precisely. <P>SOLUTION: The shaft type linear motor 10 comprises a stator 20 including a pipe member 21 for containing a plurality of magnets 24, and a moving member 30 including a coil formed by winding a wire arranged to wrap the stator 20 wherein the moving member 30 is constituted by coupling a plurality of tubular members 32 having a flange and applied with a coil 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a shaft-type linear motor and a radiation image reading apparatus that are configured by combining a plurality of magnets.

Recently, for example, in the field of OA equipment and medical equipment, it has been proposed to use a shaft-type linear motor in a portion where linear movement is required. Normally, a shaft-type linear motor is arranged in such a manner that a plurality of magnets are combined in series so that opposite magnetic poles face each other, and the stator is disposed on the outside of the stator so as to surround the stator. And a mover including a coil formed by winding a slidable wire. By passing an electric current through the coil so as to cross the magnetic flux generated by the magnet, a driving force is generated in the coil in the axial direction based on the interaction between the electric current and the magnetic field, and as a result, the movable part moves. (Japanese Patent Laid-Open No. 10-313566).
Japanese Patent Laid-Open No. 10-313566

  In such a shaft type linear motor, for example, there is a configuration in which air core coils are aligned and fixed to have a desired pitch using a jig or the like, but the manufacturing accuracy of each air core coil is movable. Affects the accuracy of. In addition, it is not easy to change the size of the mover by changing the number of air-core coils to be connected. For example, the specifications of the shaft type linear motor can be easily changed according to OA equipment and medical equipment. could not.

  The present invention has been made in view of such circumstances, and provides a shaft-type linear motor and a radiation image reading apparatus that can change the size of the mover with a simple configuration and can be manufactured by accurately aligning the coils. To do.

  In order to solve the above problems, the present invention is configured as follows.

  The invention according to claim 1 is a shaft type linear motor having a stator including a pipe-shaped member that houses a plurality of magnets, and a mover including a coil formed by winding a wire disposed so as to wrap the stator. The shaft has a structure in which a plurality of flanged cylindrical members having the coils are connected to each other.

  The invention according to claim 2 is the shaft type linear motor according to claim 1, wherein the flanged cylindrical member is connected by adhesion.

  According to a third aspect of the present invention, the widthwise dimension of the flanged cylindrical member is the same as one third of the magnetic pole pitch of the stator. It is a shaft type linear motor of description.

  In the invention according to claim 4, a slit having a width dimension equal to or larger than the outer diameter dimension of the wire rod is provided on at least one of the side surfaces of the flanged cylindrical member, and the winding start of the wire rod is taken out from the slit, The shaft type linear motor according to any one of claims 1 to 3, wherein the shaft type linear motor is wound so as to be an outer surface wound at a winding end.

  According to a fifth aspect of the present invention, there is provided a radiographic image reading apparatus using the shaft type linear motor according to any one of the first to fourth aspects as a drive source.

  With the above configuration, the present invention has the following effects.

  According to the first aspect of the present invention, the mover has a structure in which a plurality of flanged cylindrical members having coils are connected, and the pitch of the coils can be determined with the accuracy of the parts, so that no fine adjustment is required. . Further, by changing the number of connecting cylindrical members with flanges, the obtained thrust can be easily changed, and the insulation of each coil can be secured by the cylindrical member with flanges.

  According to the second aspect of the present invention, the flanged cylindrical members are connected by bonding and have a simple configuration.

  According to the third aspect of the present invention, the dimension in the width direction of the flanged cylindrical member is the same as one third of the magnetic pole pitch of the stator, and the motor performance can be guaranteed only by the component accuracy.

  According to the invention described in claim 4, since a slit having a width dimension equivalent to the outer diameter dimension of the wire to be wound is provided on at least one of the side surfaces of the flanged cylindrical member, the wire rod is drawn when the winding start of the wire rod is pulled out. Can be passed through the slit, the deformation of the flanged cylindrical member can be suppressed, and the wire can be efficiently aligned and wound. For this reason, compared with the case where there is no slit, the number of windings in one line of the wire increases, so that the outer diameter of the coil after winding is reduced and the motor performance is advantageous.

  According to the fifth aspect of the present invention, the shaft type linear motor according to any one of the first to fourth aspects of the drive source is excellent in the conveyance performance because the accuracy of the coil pitch is high. Therefore, a good image can be obtained with a radiation image reading apparatus that requires particularly severe image quality. Moreover, the thrust obtained by changing the number of the coils to be connected can be easily changed even when the conveyance direction of the object to be conveyed is horizontal or vertical by the devices such as standing position and standing position.

  Hereinafter, embodiments of the shaft type linear motor and the radiation image reading apparatus of the present invention will be described. However, the embodiments of the present invention show the most preferable modes of the present invention, and the present invention is not limited thereto.

  FIG. 1 is a schematic configuration diagram of a shaft type linear motor. The shaft type linear motor 10 includes a stator 20 including a pipe-like member 21 that houses a plurality of magnets, and a mover 30 including a coil 31 formed by winding a wire disposed so as to wrap the stator 20. The stator 20 includes a plurality of magnets 24 and a pipe-shaped member 21 that houses the plurality of magnets 24. The magnet 24 is preferably cylindrical so that it can be efficiently accommodated in the pipe-shaped member 21. However, if the outer shape is cylindrical, a cylindrical magnet having a through hole in the center may be used. . The material of the magnet 24 is preferably a rare earth magnet having a high magnetic flux density. In particular, the rare-earth magnet is preferably a neodymium-based magnet, such as a neodymium-iron-boron magnet (Nd-Fe-B magnet), and can provide a higher thrust than other magnets.

As a material of the pipe-like member 21, it is preferable to use a nonmagnetic material such as an aluminum alloy, a copper alloy, or nonmagnetic stainless steel. The pipe-shaped member 21 is preferably as thin as possible so as not to reduce the magnetic field applied to the mover 30. In this embodiment, a thin pipe is used. By using this thin pipe, the distance between the magnet 24 and the mover 30 can be shortened to obtain a larger thrust.

  One end of the pipe-shaped member 21 is closed, and a screw portion 22 is provided integrally. Further, the other end of the pipe-shaped member 21 is opened to accommodate the magnet 24 in the pipe-shaped member 21, and a cap 23 for closing the opening is provided. The cap 23 can be formed using a nonmagnetic material similar to that of the pipe-shaped member 21.

  Inside the pipe-shaped member 21, a plurality of magnets 24 are accommodated with the same magnetic poles facing each other so as to repel each other. Although the adjacent magnets 24 are housed inside the pipe-shaped member 21 so that the adjacent magnets 24 are in close contact with each other, it is sufficient that the adjacent magnets 24 are housed so as to repel each other. You may store so that a clearance gap may be provided in this. The cap 23 restricts the magnet 24 from coming out of both ends of the pipe-like member 21 due to the repulsive force.

  The mover 30 is configured as shown in FIGS. 2 is a perspective view of a cylindrical member with a brim, FIG. 3 is a front view of the cylindrical member with a brim, FIG. 4 is a diagram showing the relationship between the outer diameter of the wire to be wound and the width of the slit, and FIG. 5 is a state in which the wire is wound. FIG. 6 is a side view of a cylindrical member with a collar having a coil, FIG. 7 is a diagram showing wiring of the coil, and FIG. 8 is a diagram showing a plurality of coupled cylindrical members with a flange having a coil. It is a perspective view of composition.

  As shown in FIG. 8, the mover 30 has a configuration in which a plurality of flanged cylindrical members 32 each having a coil 31 around which a wire is wound are connected. The flanged cylindrical member 32 is connected by adhesion, and in this embodiment, the coil 31 is configured (connected) in two sets, each set of U, V, and W phases. Can be changed.

  The flanged cylindrical member 32 is configured as shown in FIGS. The flanged cylindrical member 32 has a cylindrical portion 32a and flanges 32b and 32c on both sides of the cylindrical portion 32a. As shown in FIG. 6, the flanged cylindrical member 32 has a width dimension W of the flanges 32 b and 32 c on both sides equal to 1/3 of the magnetic pole pitch S by the magnet 24 of the stator 20. Motor performance can be guaranteed only with parts accuracy.

  As shown in FIGS. 2 and 3, the flanged cylindrical member 32 has a slit 32d formed in a straight line on at least one of the side surfaces in the flange 32b in this embodiment from the vicinity of the cylindrical portion 32b1 to the outer peripheral portion 32b2. Yes. The slit 32d is formed at a predetermined angle with respect to the radial direction from the axial center of the cylindrical portion 32a, and has a width dimension D2 equal to or greater than the outer diameter dimension D1 of the wire to be wound, as shown in FIG.

  The winding start 31a of the wire rod is wound from the end portion of the cylindrical portion 32a, and when wound to the opposite end portion, the winding is overlapped and returned to the winding start 31a side, and the winding is repeated by this repetition as shown in FIG. Coil 31. As shown in FIGS. 4 and 5, the winding start 31a of the wire is taken out from the slit 32d and wound so as to be the outer surface wound with the winding end 31b. Since the slit 32d having a width D2 equivalent to the outer diameter D1 of the wire to be wound is provided in the flange 32b on the side surface of the flanged cylindrical member 32, the wire is passed through the slit 32d when the winding start 31a of the wire is pulled out. Can do. For this reason, when the winding start 31a is pulled out, the wire does not pass through the slit 32d and does not fold the inner surface of the flange 32b, so that the deformation of the flanged cylindrical member 32 can be suppressed and the wires can be efficiently aligned. Can be rolled.

  Furthermore, since the coil 31 increases the number of windings of one line of the wire, the outer diameter of the coil 31 that has been wound is reduced. For this reason, the efficiency of the interaction between the magnetic flux generated from the stator 20 and the magnetic field generated by the coil 31 is improved, which is advantageous in terms of motor performance.

  As shown in FIG. 7, the flanged cylindrical member 32 having the coil 31 formed by winding the wire rod has a U phase, a V phase, and a W phase, for example, as shown in FIG. Connected by soldering. As shown in FIGS. 6 and 8, a plurality of flanged cylindrical members 32 each having a coil 31 formed by winding the wire can be easily connected by, for example, bonding. Further, when the so-called mat treatment or the like is performed on the side surface of the flanged cylindrical member 32, the adhesiveness (strength) is improved.

  As shown in FIG. 4, the flanged cylindrical member 32 is equal to or greater than the outer diameter D1 of the wire wound by the wall thickness D10 of the cylindrical portion 32a. By making the cylindrical portion 32a thin, as shown in FIGS. 1 and 6, the spatial distance L0 between the coil 31 and the magnet 24 can be shortened, so that more thrust can be obtained.

  Further, as shown in FIGS. 6 and 8, the outermost diameter D30 of the flanged cylindrical member 32 is equal to or greater than the outer diameter D40 of the coil 31, and is movable when the shaft type linear motor 10 is incorporated in the apparatus, for example. Even if there is a foreign object or the like on the surface opposite to the outer surface of the child 30, the flanges 32b and 32c of the flanged cylindrical member 32 are larger than the outer surface of the coil 31, so that the foreign object hits the coil outer surface (that is, the wire). Damage to the wire can be prevented.

  In this embodiment, when a plurality of flanged cylindrical members 32 having coils 31 around which a wire is wound are connected, the winding start 31a of the wire must be pulled out, but the coil pitch can be reduced by inserting it into the slit 32d. It can be secured with high accuracy.

  Moreover, since the winding start 31a of a wire does not overlap, it can wind efficiently arranging.

  As shown in FIGS. 2 to 7, the mover 30 is formed by winding a wire around a flanged cylindrical member 32 to form a coil 31, and a plurality of flanged cylindrical members 32 having the coil 31 are formed as shown in FIG. Since it is a connected configuration, the pitch of the coil 31 can be determined with the accuracy of the parts, so fine adjustment is not necessary. Further, by changing the number of connected cylindrical members 32 with the flanges 31 having the coils 31, the obtained thrust can be easily changed, and the insulating properties of the coils 31 can be ensured by the cylindrical members 32 with the flanges. .

  The shaft type linear motor 10 of this embodiment is manufactured by manufacturing a unit in which a desired number of windings are wound on a thin-walled cylindrical member 32 with a brim, and bonding and connecting the units by a desired number. The mover 30 is configured. The number of units is a number required according to the conveying force of the shaft-type linear motor 10, and is basically set by the number of sets in which the U / V / W phases are set as one set.

  At this time, the shaft-like member 21 is accurately fitted to the inner diameter of the unit of the cylindrical member 32 with the flange by manufacturing the inner diameter dimension of the cylindrical portion 32a of the cylindrical member 32 with the flange with high accuracy. By inserting the necessary number of flanged cylindrical members 32 into the shaft-like member 21 and sandwiching the flanged cylindrical members 32 from each other with separate members, the overall length of the unit of the flanged cylindrical member 32 can be accurately measured. You can make a good decision. Thereby, the origin position of the unit of the shaft-like member 21 and the flanged cylindrical member 32 can be determined only by the component accuracy.

  This shaft type linear motor 10 can be used as a drive source of a radiation image reading apparatus. An embodiment of this radiation image reading apparatus is shown in FIG.

  The radiographic image reading apparatus 1 includes an optical unit 5, a carriage 3, a shaft type linear motor 10, a linear motion guide 4, a linear encoder 7, and a plate support portion 6 as main components, and a base 2 that supports these components. And an exterior cover 8 covering these. In this embodiment, the radiation image reading apparatus 1 configured to convey the optical unit 5 by the shaft type linear motor 10 will be described. However, the present invention is not limited to this, and a stimulable phosphor plate 9 described later is provided. It is good also as a structure to convey.

  In the upper part of the base 2, a shaft type linear motor 10, a carriage 3, a linear motion guide 4, a linear encoder 7, an optical unit 5, a plate support 6 and the like are provided.

  As shown in FIG. 1, the shaft type linear motor 10 includes a rod-shaped stator 20 and a mover 30. The stator 20 accommodates a plurality of magnets 24 inside the pipe-shaped member 21 so that the adjacent magnets 24 repel each other, and both ends are held by the stator holding portion 40 and the base 2 is attached. It is fixed in parallel. The stator 20 is inserted through the center of the mover 30. This is a structure for attaching the stator 20 to the stator holding part 40.

  The mover 30 is fixed to the lower surface of the transport table 3. A coil is housed inside the mover 30. As the coil, a coil group composed of a plurality of phases, for example, three phases can be used, but is not limited thereto. Further, the mover 30 is provided with an insertion hole through which the stator 20 is inserted. When a current is passed through the coil, the mover 30 obtains a magnetic force repelling the magnet 24 housed in the stator 20 and moves in the axial direction of the stator 20.

The carriage 3 supports the optical unit 5 and moves in the axial direction of the stator 20 together with the mover 30 fixed to the lower surface. The linear motion guide 4 is disposed on the base 2 in parallel with the stator 20 and assists the movement of the transport table 3. The linear encoder 7 is provided on the base 2 in parallel with the stator 20 and the scale 71. The linear encoder 7 is provided on the transport table 3, and the scale 71 is kept at a constant interval.
And a head 72 that moves along the head. The linear encoder 7 measures the position of the transport table 3.

  The optical unit 5 includes a laser beam irradiation device (not shown) that irradiates the stimulable phosphor plate 9 while scanning the laser beam in a direction orthogonal to the moving direction of the optical unit 5, and a laser beam irradiation device. A light guide plate 51 that guides the stimulated emission light excited by irradiating the photostimulable phosphor plate 9 with laser light, and a condenser tube 52 that collects the stimulated emission light guided by the light guide plate 51, And a photoelectric converter 53 that converts the photostimulated luminescent light collected by the condenser tube 52 into an electrical signal.

  In the image reading apparatus of the present invention, although not shown, the photostimulable phosphor is used to release the radiation energy remaining on the photostimulable phosphor plate 9 after the radiation energy is read by the optical unit 5. An erasing device for irradiating the plate 9 with erasing light is provided.

The plate support 6 supports the photostimulable phosphor plate 9 obtained by X-ray photography in parallel with the direction in which the optical unit 5 moves. The photostimulable phosphor plate 9 records a latent image transmitted by X-ray imaging, and emits stimulated emission light corresponding to the dose when irradiated with laser light from a laser beam irradiation device. The photostimulated emission light is photoelectrically converted by the photoelectric converter 53 to obtain digital image data. The obtained digital image data can be visualized as a radiation image by appropriate means.

The exterior cover 8 is provided so as to cover these devices. The exterior cover 8 is provided with a loading / discharging port 81 for loading or discharging the stimulable phosphor plate 9 into the apparatus. Further, the outer cover 8 is provided with a stator attaching / detaching port 82 for taking out the stator 20 for inspection and inserting it again.
As described above, the shaft type linear motor using the present invention is excellent in conveying performance because of high accuracy of the coil pitch. Therefore, a good image can be obtained with a radiation image reading apparatus that requires particularly severe image quality. Moreover, the thrust obtained by changing the number of coils to be connected can be easily changed by the devices such as the standing position and the recumbent position even if the conveyance direction of the object to be conveyed is horizontal or vertical.

  The present invention can be applied particularly to a linear motor and a radiographic image reading apparatus configured by combining a plurality of magnets. The size of the mover can be changed with a simple configuration, and the coils can be accurately aligned.

It is a schematic block diagram of a shaft type linear motor. It is a perspective view of a cylindrical member with a brim. It is a front view of a cylindrical member with a brim. It is a figure which shows the relationship between the outer diameter dimension of the wire wound, and the width dimension of a slit. It is a perspective view of the cylindrical member with a brim which shows the state which wound the wire. It is a side view of a cylindrical member with a brim having a coil. It is a figure which shows the wiring of a coil. It is a perspective view of the composition which connected two or more cylindrical members with a flange which have a coil. It is a perspective view which shows embodiment of a radiographic image reading apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Shaft type linear motor 20 Stator 21 Pipe-shaped member 24 Magnet 30 Mover 31 Coil 32 Cylindrical member with brim

Claims (5)

In a shaft type linear motor having a stator including a pipe-shaped member that houses a plurality of magnets, and a mover including a coil formed by winding a wire disposed so as to wrap the stator,
The shaft-type linear motor is characterized in that the movable element has a structure in which a plurality of flanged cylindrical members having the coil are connected.   2. The shaft-type linear motor according to claim 1, wherein the flanged cylindrical members are connected by adhesion.   3. The shaft type linear motor according to claim 1, wherein a dimension of the flanged cylindrical member in the width direction is the same as 1/3 of a magnetic pole pitch of the stator. 4. At least one of the side surfaces of the flanged cylindrical member is provided with a slit having a width dimension equal to or greater than the outer diameter dimension of the wire,
The shaft type linear motor according to any one of claims 1 to 3, wherein the winding start of the wire is taken out from the slit and wound so as to be an outer surface wound with the winding end. 5. A radiation image reading apparatus using the shaft type linear motor according to claim 1 as a driving source.