JP3729455B2 - Positioner for directivity measurement of small wireless devices - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a positioner capable of rotating the orientation of a device in a three-dimensional manner by remote control when measuring the directivity such as sensitivity and radiated power of a portable small wireless device such as a cellular phone. is there.
[0002]
[Prior art]
In a portable small wireless device such as a mobile phone, the operating frequency is being expanded beyond the ultra high frequency band. Measurement of directivity such as sensitivity and radiated power of such a small wireless device is carried out by storing it in a positioner and rotating the device by remote control. However, conventional positioners can ignore the influence of themselves. It is gone.
[0003]
This is because the mechanical components that make up the positioner are not only made of metal but also non-conductive materials such as wood and resin. This is because it has the property of easily interfering.
[0004]
Currently, foamed resin has been used as a material having relatively little influence on measurement in this frequency band, and among them, foamed polystyrene is known to be extremely effective. However, since the polystyrene is low in mechanical strength, it is currently used only as a static jig such as a fixed base.
[0005]
Moreover, since a portable small-sized radio | wireless apparatus can take all attitude | positions for the portability, in order to evaluate the performance, it must consider a three-dimensional directivity. However, most conventional test sites that measure the sensitivity of radio equipment and the directivity of radiated power are mostly positioners with only one axis rotation, such as turntables. Each time an efficient evaluation was made, an inefficient method such as rotating the EUT after changing its attitude had to be taken.
[0006]
[Problems to be solved by the invention]
In view of the above problems, it is an object of the present invention to provide a positioner capable of performing performance evaluation on every posture that is normally used in a portable small wireless device.
[0007]
[Means for Solving the Problems]
1) A positioner for measuring the directivity of a test device such as a small wireless device having an operating frequency of the ultra-high frequency band or higher, wherein the positioner is made of a foamed resin material and placed in the positioner. Rotation in the biaxial direction of rotation of the storage cylinder and rotation for scanning the elevation direction of the EUT storage cylinder was made possible.
2) A positioner for measuring the directivity of a test device such as a small wireless device having an operating frequency of the ultra-high frequency band or higher, wherein the positioner is made of a foamed resin material and is placed in the positioner. The rotation of the storage cylinder and the biaxial rotation of scanning for scanning the azimuth direction of the EUT storage cylinder were made possible.
3) A positioner for measuring the directivity of a test device such as a small wireless device having an operating frequency of the ultra-high frequency band or higher, wherein the positioner is made of a foamed resin material and placed in the positioner. The rotation of the storage cylinder, the rotation for scanning the elevation angle direction of the EUT storage cylinder, and the rotation for scanning the azimuth direction of the EUT storage cylinder were enabled in three axial directions.
4) The foamed resin material was a polystyrene foam material.
5) A rotation driving source that scans in three axial directions is mounted in a positioner made of a foamed resin material and is a remotely operable motor. A gear that transmits the driving force of the motor is an arc gear.
6) Two driving gears made of polystyrene foam are fixed on the same axis, the pitch of these two gears is shifted by 1/2 pitch in the circumferential direction, and the gears shifted by 1/2 pitch are driven by the same drive source. Rotated with a pinion.
7) A motor for driving a gear made of a foamed polystyrene material is a gear-like rotor made of a foamed polystyrene material, and a stator having a plurality of elastic tubes made of rubber or resin surrounding the rotor and having a smaller number of teeth than the rotor. In this configuration, pneumatic pulses generated at regular intervals are supplied to the telescopic tube, and the expansion pressure of the telescopic tube is caused to act on the tooth surface of the rotor.
8) The length of the telescopic tube is approximately the same as the width of the rotor, and it expands when pneumatic pulses are supplied and contracts when exhausting.
9) Depressurize with a vacuum pump to expedite the contraction of the telescopic tube during contraction.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention can be summarized as follows. In order to evaluate the directivity of a test machine such as a small wireless device in three dimensions, (1) in order to suppress the influence on radio waves exceeding the ultra-high frequency band as much as possible, almost all parts of the positioner Is made of polystyrene foam, and (2) the storage cylinder of the EUT is a two-axis or three-axis positioner that can move in three dimensions, and (3) the two or three axes that move the positioner are also affected by radio waves. It is characterized in that it is made of a foamed polystyrene material as a resin that can suppress the above.
[0009]
Hereinafter, an example of an embodiment will be described with reference to the drawings.
As characteristic features of the present invention, (1) a rotation axis of a storage cylinder in which a test machine such as a mobile phone is set, (2) a rotation axis that gives rotation for scanning the elevation direction of the rotation axis, and (3) Similarly, a total of three rotation axes are provided, which are rotation axes that provide rotation for scanning in the azimuth direction. In addition, it is not limited to three axes in this way, and it is needless to say that two axes obtained by combining either the elevation angle direction or the azimuth direction with respect to the rotation axis among the three axes can be configured. In the following description, rotation for scanning in the three axis directions will be described.
[0010]
In addition, the gear for power transmission built into this positioner is made of foamed resin such as polystyrene foam material, adopts a tooth profile suitable for the nature of such a light and soft material, and the drive source is a low-speed rotating air A motor is used, and the drive rotor is also composed of foamed polystyrene.
[0011]
Such positioners include, for example, GTEM (Giga heltz Transverse Electromagnetic Wave) cells manufactured and sold by the applicant, that is, performance evaluation of wireless devices, as well as EMC tests such as unwanted radiation noise measurement and radiated electromagnetic field tests, It is used by being mounted on an electromagnetic environment test apparatus such as a calibration of an electric field sensor.
[0012]
This will be described below with reference to the drawings. FIG. 1 shows a positioner according to the present invention, FIG. 1 (a) is a plan view of the positioner, FIG. 1 (b) is a front view as viewed in the direction of arrow B in FIG. 1 (c), and FIG. Fig. 1 (a) is a left side view as viewed from the arrow C, and Fig. 2 (d) is a right side view as viewed from the arrow D of Fig. 1 (a).
[0013]
As described above, all of the positioners are made of a foamed resin that can suppress the influence on radio waves as much as possible, preferably made of foamed polystyrene (hereinafter, foamed polystyrene will be described).
[0014]
The base 1 of the positioner has an inclined bottom surface 2 as shown in FIG. A test machine (not shown) such as a mobile phone is housed in a test machine storage cylinder 3 located at the center of the positioner, and covered with a lid 3 '(FIG. 2C) for inspection and measurement work. The storage cylinder 3 is between a pair of support plates 4 a and 4 b erected in the positioner, and is supported rotatably around the axis of the storage cylinder 3.
[0015]
A pair of rotation gears 5 a and 5 b for rotating the storage cylinder 3 are fixed to the body portion of the EUT storage cylinder 3. In the figure, the rotation gear 5 is composed of two gears 5a and 5b. However, as shown in FIG. 3, these gears 5a and 5b are shifted from each other by a pitch P of 1/2 with respect to the adjacent cylinder 3 as shown in FIG. Installed on. This is because when a driving air motor (M ¹ ) 6 is used as a driving source, which will be described later, when the storage cylinder 3 is rotated forward or reverse by this, the backlash of the gear is reduced by this 1/2 pitch deviation. It can be driven smoothly. If a material other than foamed polystyrene material that can suppress the influence on radio waves is used, and there is no concern about strength or driving accuracy, it is of course possible to use a single gear.
[0016]
The driving force generated in the air motor (M ¹ ) 6 is transmitted via the output shaft 7 → pinion 8 → pinion 9, 9 ′ → shaft 10, and rotates one rotating gear 5a. Similarly, the driving force generated in the motor (M ¹ ) 6 is similarly transmitted to the other rotating gear 5 b via the output shaft 7 → pinion 8 → pinion 9, 9 ′ → shaft 10. At this time, the paired gears 5a and 5b are shifted by 1/2 pitch (see FIG. 3), and thus are driven intermittently.
[0017]
The output shaft 7 is supported by a bearing hole provided in a support plate 4 (4a or 4b) made of polystyrene foam. This bearing hole is made of a low friction material such as Teflon in a hole (not shown) provided in the support plate 4. The rotational friction of the bearing portion is reduced by sticking or applying a liquid material for anti-friction.
[0018]
Further, gears or bearing holes made of a polystyrene foam material can be processed with high accuracy using, for example, a known hot wire cutter.
[0019]
The second rotational movement of the positioner, i.e. the rotation in the azimuthal direction, i.e. the rotation in the horizontal plane, is as follows.
The rotation in the azimuth direction is performed via a large gear 12 (12a, 12b) driven by a motor (M ² ) 11 (see FIG. 2D). The large gear 12 is also composed of a pair of gears 12a and 12b attached adjacent to the coaxial shaft 13. Each of the gears adjacent to each other in the vertical direction is 1/2 like the rotation gear 5 (5a, 5b) described above. It is mounted with a pitch shift (FIG. 3), and covers rotation irregularities due to gear backlash, etc., so that rotation can be transmitted smoothly.
[0020]
The driving force of the motor (M ² ) 11 that controls the rotation in the azimuth direction is driven from the shaft 13 through the pinion 14 and further through the intermediate gears 15 and 16 (16a and 16b).
[0021]
Note that the drive system including the pair of large gears 12a and 12b for rotating in the azimuth direction above has a drive shaft when the positioner is used in the large GTEM cell or in another large test apparatus. Can be driven by a motor installed in the lower part of the bottom floor so long as it has a configuration that can suppress the influence on radio waves, it is not necessary to use a polystyrene foam material.
[0022]
Next, a description will be given of the rotation in which the elevation direction, that is, the storage cylinder 3 is tilted up and down at a certain elevation angle from the horizontal plane.
The rotation of the elevation direction driving gear 17 is driven by a motor (M ³ ) 18 (see FIG. 1A). Motor ^{M 3} are previous motor ^(M 1), similarly to the motor ^{(M 2),} using a stepping air motor to be described later. The rotational force of the motor ^{M 3} are intermediate pinion 20 from the shaft 19, the intermediate pinion 21, the drive pinion 22 is driven via a shaft 24. By this rotation, the storage cylinder 3 can be rotationally driven by ± 180 ° in the elevation angle direction, that is, in the oblique vertical direction, through the shaft fixed to the storage cylinder 3. The elevation gear 17 can thus be measured by rotating 180 degrees up and down and rotating the cylinder 360 degrees in total.
[0023]
The elevation direction driving gear 17 is pivotally supported on the outside of the support plates 23a and 23b provided facing the base 1, and the left and right gears 17 are mutually connected in the same manner as described in FIG. Arranged at a pitch of 1/2 pitch, it is possible to cover irregular rotation caused by backlash or the like.
[0024]
As described above, the positioner according to the present invention can rotate in three axes, ie, rotation of the EUT storage cylinder, rotation for scanning the azimuth angle direction, and rotation for scanning the elevation angle direction. A three-dimensional test measurement for the test of the device, ie a complete inspection in all directions assumed during normal use, is possible. If the three-axis direction is not required, it is a two-axis rotation that scans the rotation and azimuth direction of the EUT storage cylinder, or a two-axis rotation that scans the rotation and elevation direction of the EUT storage cylinder. Of course, the present invention can also be applied.
[0025]
Next, styrofoam gears that transmit the driving force from the motor will be described.
The foamed polystyrene material constituting the positioner is plastically deformed or ruptured when a large force is applied. Therefore, if the pressure is below a certain level, only a slight elastic deformation is required. Therefore, in order to realize a gear capable of transmitting a driving force with this material, it is necessary to increase the pressure receiving area per tooth as much as possible to disperse the pressure.
[0026]
Therefore, a known involute tooth profile in which a convex surface and a concave surface are in contact with each other as a gear for transmitting a driving force from a motor is avoided, and the tooth shape is an arc tooth shape so that the arc concave surface and the arc convex surface are in contact. And, by applying an appropriate load to the contact surface between the arc convex surface and the arc concave surface, the material is elastically deformed, and the fact that the contact surface is increased due to closer contact is utilized. At this time, although the friction of the surface of the expanded polystyrene material increases extremely due to adhesion, as a countermeasure to suppress the friction of the surface, a low friction material such as Teflon is stuck on the surface or coated on the surface to solve the friction problem did.
[0027]
As for the transmission gear that transmits the drive from the motor, a helical gear is ideal to reduce load unevenness and backlash due to the meshing position, but it is difficult to process with foamed polystyrene. Using two easy-to-machine spur gears, the pitch of the pair of gears is shifted by a half pitch as described above, and they can complement each other by rotating them on the same axis, enabling smooth intermittent rotation. I made it.
[0028]
Next, the configuration of an air motor that is a power source for the gears and the like will be described.
As for the air motor, it can be used not only as a positioner but also for other applications, so it was filed as a separate application at the same time as the application of the present invention as a general-purpose air motor. An air motor for the positioner to be performed will be described.
[0029]
(About air motor):
4 is a longitudinal sectional view of the air motor, and FIG. 5 is a perspective view of the main part of the air motor, showing the arrangement of the air tube and the rotor. FIG. 6 is an explanatory view of the driving mode of the air motor.
In FIG. 4, the air motor M (the air motors M ¹ , M ² , and M ³ have the same configuration) includes a central rotor (rotor) 25, a telescopic tube 26, and a stator 27. The rotor 25 has a gear shape, has an output shaft 28 at the center, and presses the tooth surface of the rotor 25 by expansion and contraction of the telescopic tube 26 equally arranged on the inner circumference of the stator, thereby rotating in a certain direction. Is granted.
[0030]
The rotor 25 has six teeth 25a, 25b, 25c, 25d, 25e, and 25f in the illustrated example. For these six teeth, five expansion tubes 26 (one less than the number of rotor teeth) on the outer periphery of the rotor are A, B, C, D on the inner wall surface of the stator 27 that supports the expansion tubes. , E are equally distributed. The extensible tube 26 is supported by a tube support plate 29 at its end, and is disposed at a certain distance in the radial direction with respect to the rotor 25.
[0031]
The telescopic tube 26 has a length straddling a pair of support plates 29, that is, a length substantially equal to the width of the rotor 25, and a supply / exhaust pipe 30 leading to a high-pressure air source is connected to one end.
[0032]
When pneumatic pulses generated by a pulse generator sent from the outside through the air supply / exhaust pipe 30 are sequentially sent to the telescopic tubes 26 located at positions A, B, C,..., The telescopic tubes 26 in the air motor M are sequentially moved. At this time, the shaft 28 also rotates sequentially through the rotor 25 by sliding into the groove while sliding on the surface of the tooth surface of the rotor 25 provided with six projections and depressions, and intermittent rotation is performed. If the order of sending these five pneumatic pulses is reversed, it can be rotated in reverse.
[0033]
Since the expansion tube 26 directly drives the rotor 25 by its expansion, no crank or gear is required inside. Thereby, it became possible to comprise the stator 27 and the rotor 25 with a polystyrene foam.
[0034]
If this principle is applied and the number of concavities and convexities of the rotor and the number of telescopic tubes are changed, a stepping motor that rotates in an arbitrary step can be manufactured.
[0035]
In the above example, the number of teeth of the rotor 25 is 6 and the number of the telescopic tubes 2 is one less than this number 5, and the telescopic tubes 2 are equally arranged on the circumference. However, the number of teeth is not necessarily limited to 6, and the number of extendable tubes is not necessarily limited to 5.
[0036]
Incidentally, FIG. 7 shows an example in which the number of teeth of the rotor is 12, the number of telescopic tubes is only 3, and the angle between the tubes is 40 °. As apparent from FIG. 7, when pulses are sequentially sent from the tube 26 at the A position to the tube 26 at the B position and then to the tube 26 at the C position, the rotor rotates intermittently by 10 °.
[0037]
FIG. 8 shows still another embodiment in which the number of teeth of the rotor = 12, the number of telescopic tubes = 3, and the angle between the telescopic tubes = 70 °. In this example as well, the rotor rotates intermittently by 10 ° every time a pulse is sent to each telescopic tube 26.
[0038]
As described above, it is possible to appropriately change the number of teeth of the rotor, the number of telescopic tubes, and the arrangement thereof, that is, the angle between the telescopic tubes 26. Further, the number of the telescopic tubes 26 and the angle between the adjacent tubes 26 can be increased / decreased according to the weight of the rotor 25 and the stator 27 or the rotational speed of the rotor 25 required. It is possible to change the numerical value as necessary to obtain an air motor having a desired function.
[0039]
The rotation driving sequence of the stepping air motor will be described with reference to FIG.
1) FIG. 6A: An air pressure pulse is sent from the air supply / exhaust pipe 30 to the telescopic tube 26 at the position A. The tube at position A instantly expands from a flat state to a cylindrical shape (cylindrical or rectangular tube) due to air pressure, and the expanded tube fits into the recess between the teeth and presses here, so the rotor 25 stops. (Note that the vacuum tube may be depressurized to quickly contract the telescopic tube).
2) FIG. 6B: Next, a pneumatic pulse is supplied to the tube at position B shifted by 72 °. The tube at the A position contracts, and at this time, the fixation by the tube at the A position is released, and a pressing force in the clockwise direction acts on the one-side tooth surface 31 (FIG. 6A) of the rotor 25 by the tube at the B position. When fully expanded, it fits in an intermediate position between the teeth 25b and 25c of the rotor 25, and the rotor 25 stops at that position. During this time, the rotor 25 rotates in the right direction.
3) FIG. 6C: The rotor 25 rotates clockwise by the contraction of the tube at the position A and the expansion of the tube at the position B, and the rotor shaft 28 stops by rotating 12 degrees.
4) FIG. 6D: Similarly, supply of the air pressure pulse to the tube at the B position is stopped, and supply of the air pressure pulse to the tube at the C position starts.
5) FIG. 6E: The rotor shaft 28 rotates 24 degrees in total, and stops when the tube at the C position expands.
6) FIG. 6f: Supply of the pneumatic pulse to the tube at the C position stops, and supply to the tube at the D position starts.
7) FIG. 6g: The tube at the C position contracts, the tube at the D position expands, and the rotor shaft rotates by a total of 36 °.
8) FIG. 6h: Supply of the pneumatic pulse to the tube at the D position ends, and supply to the tube at the E position begins.
9) FIG. 6 i: The rotor shaft rotates 48 °, and the rotor 25 stops at the tube in the E position.
10) FIG. 6j: The tube at the E position contracts, and the tube at the A position expands by supplying pneumatic pulses to the tube at the A position.
11) FIG. 6k: The rotor shaft 28 is rotated 60 ° from the first state (1) and stopped. 12) FIG. 6l: From the initial state (a) to (l), the rotor shaft 28 rotates 60 [deg.]. By repeating this 6 times, 360 [deg.], That is, one rotation is completed. Thus, the stepping rotation of the rotor 25 becomes possible by continuously operating a pneumatic pulse generating tube (not shown). For reverse rotation, the supply direction of the pneumatic pulse may be reversed.
[0040]
【The invention's effect】
In a positioner for test and measurement of a test machine such as a small mobile phone, two or more axes, for example, (1) rotation around the rotation axis of the EUT, and (2) scan the elevation direction of the rotation axis itself. 3 rotations, and (3) “rotation scanning in the azimuth angle direction” are possible, so that it was possible to test the test machine in every conceivable manner of use.
(2) Since all the positioners are made of foamed resin, for example, polystyrene foam, it is possible to suppress the influence on radio waves above the ultra-high frequency band as much as possible.
(3) Since the gear incorporated in the positioner is made of a foamed polystyrene material and the tooth shape is an arc tooth shape, an extremely smooth and highly accurate transmission accuracy can be obtained even with the foamed polystyrene material.
(4) Since the driving source of the polystyrene foam positioner is an air motor consisting of a telescopic tube that expands and contracts by pneumatic pulses at regular intervals and a gear-type rotor driven by this, it is also suitable for electromagnetic waves above the ultra-high frequency band. An ideal drive system that can suppress the influence was obtained.
(5) Further, since the gears are composed of two coaxial gears and the pitches of the two gears are shifted by ½, even a styrofoam gear can transmit power very smoothly.
[Brief description of the drawings]
1A is a plan view of a positioner, and FIG. 1B is a front view as viewed in the direction of arrow B in FIG. 1;
2 (c) is a side view as viewed from an arrow C in FIG. 1, and FIG. 2 (d) is a side view as viewed from an arrow D in FIG.
FIG. 3 shows a configuration in which the pitch of the pair of power transmission gears is shifted to 1/2 pitch.
FIG. 4 is a cross-sectional view of an air motor.
FIG. 5 shows a telescopic tube for supplying power to a rotor of an air motor.
FIG. 6 is an explanatory diagram of driving of the air motor.
FIG. 7 shows another embodiment of an air motor.
FIG. 8 shows still another embodiment of the air motor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Base 2 Bottom surface 3 Equipment storage cylinder 4 Support plate 5 Rotating gear 6 Motor (M ¹ )
7 Output shaft 8 Pinion 9 Pinion 10 Axis
11 motor ^(M 2) 12 large gear
13 axis 14 pinion
15 Intermediate gear 16 Intermediate gear
17 Gear 18 Motor (M ³ )
19 axis 20 intermediate pinion
21 Intermediate pinion 22 Drive pinion
23 (23a, 23b) Support plate 24 axes
25 Rotor 26 Telescopic tube
27 Stator 28 Output shaft
29 Support plate 30 Air supply / exhaust pipe
31 Tooth surface on one side (rotor)

Claims (9)

  A positioner for measuring the directivity of a test machine such as a small radio device having an operating frequency of the ultra-high frequency band or higher, wherein the positioner is made of a foamed resin material, and the tester storage cylinder placed in the positioner A positioner for directivity measurement of a small wireless device or the like, which is capable of rotating in two directions, ie, rotation of the EUT and rotation of scanning the elevation angle direction of the EUT storage cylinder.   A positioner for measuring the directivity of a test machine such as a small radio device having an operating frequency of the ultra-high frequency band or higher, wherein the positioner is made of a foamed resin material, and the tester storage cylinder placed in the positioner A positioner for directivity measurement such as a small wireless device, which is capable of rotating in two directions, that is, rotation of the EUT and rotation in which the azimuth angle of the EUT storage cylinder is scanned. A positioner for measuring the directivity of a test machine such as a small wireless device having an operating frequency of the ultra-high frequency band or higher, wherein the positioner is made of a foamed resin material , and the tester storage cylinder placed in the positioner A compact wireless system capable of rotating in three directions: rotation of the EUT, rotation that scans the elevation direction of the EUT storage cylinder, and rotation that scans the azimuth direction of the EUT storage cylinder Positioner for measuring directivity of devices.   The positioner for directivity measurement of a small wireless device or the like according to claim 1, wherein the foamed resin material is a polystyrene foam material. The rotation drive source that scans in three axial directions is a motor that is mounted in a positioner made of a foamed resin material and can be operated remotely, and the gear that transmits the drive force of the motor is an arc gear. A positioner for directivity measurement, such as a compact wireless device according to claim 2 or claim 3.   Two drive gears made of polystyrene foam are fixed on the same axis, the pitch of these two gears is shifted by 1/2 pitch in the circumferential direction, and the gears shifted by 1/2 pitch are driven by the same drive source. 6. A positioner for measuring directivity of a small wireless device or the like according to claim 5, wherein the positioner is rotated by a pinion.   A motor for driving a gear made of foamed polystyrene material is composed of a geared rotor made of foamed polystyrene material, and a stator having a plurality of elastic tubes made of rubber or resin surrounding the rotor and having a smaller number of teeth than the rotor. 3. The pneumatic tube according to claim 1, wherein the pneumatic tube is rotated by supplying pneumatic pulses generated at regular intervals and causing the expansion pressure of the telescopic tube to act on the tooth surface of the rotor. A positioner for directivity measurement of the small wireless device according to 3.   The positioner for measuring directivity of a small wireless device or the like according to claim 7, wherein the telescopic tube has a length substantially equal to the width of the rotor, and expands when pneumatic pulses are supplied and contracts when exhausted.   The positioner for directivity measurement of a small wireless device or the like according to claim 8, wherein the pressure is reduced by a vacuum pump in order to accelerate the contraction of the expansion tube at the time of contraction.

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