JPS63181503A - Antenna driving device - Google Patents

Abstract

PURPOSE:To securely switch the vertical and horizontal planes of polarization of an antenna by attaching a toothed gear to the revolving shaft of the antenna, engaging a toothed belt to the toothed gear, rotating the revolving shaft of the antenna with the aid of the up-and-down motion of the toothed belt and limiting the rotation of the antenna by providing a stopper mechanism in the revolving shaft of the antenna. CONSTITUTION:The antenna is mounted and the rotary axis 31 which is the center of the rotation of the antenna, the toothed gear 32 fitted to the revolving shaft 31, the ascending and descending housing 21 supporting the revolving shaft 31 through bearings 33 and 34 and fitted to a column 5 by which the antenna 4 ascends and descends in order that it can freely ascend and descend, a second toothed belt 36 fitted in the up-and-down direction of the column 5 and meshing with the toothed gear 32 of the revolving shaft 31 supported to the ascending and descending housing 21 so as to execute the rotation driving of the antenna and the stopper mechanism 35 for controlling the rotation of the revolving shaft 31 constitute the titled device as main constituting elements. The switching of the vertical and horizontal planes of polarization of the antenna can be securely executed without being influenced by the expansion and contraction of the belt.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to an antenna drive used for vertically or horizontally switching the polarization plane of an elevating antenna used in a magnetic wave measuring device to remove unnecessary 1 emitted from electronic equipment, etc. It is related to the device.

<Summary of the Invention> In the present invention, a gear is attached to the rotating shaft of the antenna, and a toothed belt is engaged with the gear, and the vertical movement of the toothed belt rotates the rotating shaft of the antenna, and also rotates the antenna. By installing a stopper mechanism on the shaft to limit the rotation of the antenna, it is a reliable configuration with less damage, and the vertical and horizontal polarization planes of the antenna can be reliably switched without being affected by the extension or contraction of the belt. The present invention provides an antenna driving device that can drive the antenna.

<Prior Art> Conventionally, electronic devices such as televisions and video tape recorders have incorporated electronic components and circuits that emit electromagnetic waves during operation. Electromagnetic waves emitted from such electronic devices cause noise in other electronic devices and communication devices such as televisions and video tape recorders.

Therefore, the electronic devices mentioned above are equipped with various electromagnetic shielding means to prevent unnecessary electromagnetic waves from being emitted to the outside. However, when shipping the various electronic devices mentioned above as products, It is necessary to detect and measure whether electromagnetic waves are being emitted from the product.

In order to measure such unnecessary electromagnetic waves, a measuring device as shown in FIG. 6, for example, has conventionally been used.

This measuring device includes a rotary R mounting table 3 on which an electronic device 2, etc. as an object to be measured is placed on an electromagnetically shielded drive mechanism storage base 1, and a position facing the rotary mounting table 3. It is constructed by arranging an elevating type antenna 4.

By the way, in the measurement device described above, in order to measure various electromagnetic waves emitted from the electronic device 2 and the like, it is required that the antenna 4 be variable with respect to the electronic device 2. This is to measure the strength and radiation direction characteristics of electromagnetic waves emitted from the electronic device 2 and the like.

Therefore, in the conventional measuring device, the antenna 4 is movable up and down on a support 5 disposed on the base 1 at a position facing the rotary mounting table 3, and the antenna 4 can be moved horizontally or vertically. The plane of polarization of the antenna 4 can be switched by rotating.

The elevation drive device 7 that drives the antenna 4 up and down on the support column 5 and the polarization plane switching device 11 that switches the polarization plane of the antenna are shown in FIGS. 7 and 81!, for example. The one shown in 1 is used.

This elevating drive device 7 rotatably holds a rotary shaft 12 to which the antenna 4 is attached by a bearing 17, and is an elevating device that is operated to move up and down on a column 5 by driving a first belt member 8 such as a round belt. It consists of a housing 9 and a drive motor (not shown) that rotationally drives the first heald member 8, and the first belt member 8 is disposed across the height direction of the support column 5. A drive motor for driving the drive mechanism 8 is disposed within a column support base 10 disposed within the drive mechanism storage base 1 which is electromagnetically shielded.

Next, the polarization plane switching device 11 is provided in the elevating housing 9. This polarization plane switching 1LW11 includes a cam member 13 that engages with a rotating shaft 12 serving as the center of rotation of the antenna 4 for rotational operation, and a cam member 13 that engages with one end side of this cam member 13 and uses this cam member 13 for the above-mentioned elevation. It consists of a sliding plate 14 that is driven approximately at right angles within the housing 9, and a second belt member 15 that is disposed across the height direction of the support column 5 in order to slide on this sliding plate 14. .

The second belt member I5 is rotationally driven by a drive motor disposed within the column support base 10.

Therefore, by controlling the rotation of the drive motor that drives the first belt member 8, the support column 5 of the lifting housing 9 is
While controlling the height position of the antenna 4 on the top,
By driving the second belt member 15 that drives the sliding plate 14 provided in the lifting housing 9 to change the position of the sliding plate 14 in the lifting housing 9, the antenna 4 can be vertically moved. Alternatively, the plane of polarization in the horizontal direction can be switched.

As described above, the driving morphs serving as the driving devices for the antenna elevation drive device 7 and the polarization switching device 11 are housed in the electromagnetically shielded base 1, so that in the measurement with this measuring device, Since the purpose is to measure minute unnecessary electromagnetic waves generated from the electronic equipment 2, etc., it is necessary to maintain the receiving antenna characteristics of the antenna 4 with high precision, and to prevent electromagnetic waves generated from things other than the electronic equipment 2 from being transmitted to the antenna. This is to prevent 4 from being received.

Accordingly, the drive mechanism for rotationally driving the rotary mounting table 3 in the direction of arrow X in FIG. 6 is also housed in the base 1, and the drive mechanism storage base 1 itself is also Care has been taken to ensure that the receiving antenna characteristics of the above-mentioned antenna are not adversely affected by being buried underground.

Note that when measuring electronic equipment 2 such as a television or video television recorder, the rotating mounting table 3 and the supporting column 5 are usually used.
The distance between the rotary mounting table 3 and the electronic device mounting section is approximately 1 m above the ground, and the branch office 5 has a height of approximately 5 m. The elevating antenna 4 is movable up and down within a range of 1 m to 4 m above the ground.

This eliminates the influence from the R plane of the device by placing a certain distance from the base l, and also changes the strength and direction of the TL electromagnetic waves generated from the electronic equipment 2 etc. by moving the antenna 4 within a range of 3 m. This is to measure.

In the measuring device configured in this manner, the electronic equipment 2 and the like are placed on the rotary mounting table 3 as an object to be measured. Then, by driving the first belt member 8 and synchronizing the second heald member 15, the antenna 4 is raised and lowered,
The antenna 4 is positioned at a distance y required for a certain measurement from the electronic device 2 and the like. Then, the electronic device 2, etc., which is the object to be measured, is operated, and at this time, unnecessary electromagnetic waves emitted from the electronic device 2, etc. are received by the antenna 4, and the received signal is transmitted from the antenna 4 to the antenna 4. The unnecessary electromagnetic waves are measured by transmitting them to a measuring device via a coaxial cable 16. Note that this coaxial cable 16 is wound up by a cable winding device 17 disposed within the base 1, so that the cable is always arranged in a constant manner.

Further, the polarization plane of the antenna is switched by vertically moving only the second belt member 15 to change the position of the sliding plate 14 in the lifting housing 9, so that the antenna 4 can be vertically or The strength and directionality of unnecessary radio waves emitted from the electronic device 2 are measured by switching the horizontal polarization plane.

<Problems to be solved by the invention> By the way, as mentioned above, this measuring device has Jl! Since the antenna is intended to reduce unnecessary minute electromagnetic waves generated from electronic equipment and the like, it is required that the receiving antenna characteristics of the antenna be maintained with high accuracy.

Therefore, on the above-mentioned base, the electronic device to be measured is placed on the i! The only thing that is installed is the rotation 'gj' to be placed, the mounting stand, the antenna to perform the measurement, and the column on which the antenna is raised and lowered, and the drive system that drives these is all housed in the drive mechanism housing base. The components that affect the receiving antenna characteristics of the antenna are removed from the base as much as possible.

Therefore, in the antenna drive device that switches the plane of polarization of the antenna, a material that reflects electromagnetic waves, such as a metal material, cannot be used on the top of the base.

Furthermore, when raising and lowering the antenna, it is required that the raising and lowering operations be performed quickly and smoothly, and that the position of the antenna can be reliably regulated.

Furthermore, in switching the vertical or horizontal plane of polarization of the antenna, the antenna must be able to reliably vary at right angles.

However, in the conventional antenna drive device as described above, due to strength issues, the cam member that rotatably connects the rotation shaft supporting the antenna to the support is attached to the lifting housing, and It is used for metal members such as cam members that rotate the shaft. Therefore, these metal members may have an adverse effect on the measurement of unnecessary electromagnetic waves generated from electrical equipment.

To solve this problem, if the cam member, etc. is made of a resin material, sufficient strength cannot be maintained, and due to the repeated sliding movement of the sliding plate, the joint between the sliding plate and the cam member Furthermore, there is a risk that damage may occur on the sliding surface of the sliding plate provided on the elevating housing.

In addition, in switching the vertical or horizontal polarization plane of the antenna, the polarization plane is switched by driving a belt and sliding a sliding plate to change its position with respect to the elevating housing. In such a means for moving the sliding plate by driving a belt, if the belt itself expands or contracts due to temperature, an error will occur in the sliding range of the sliding plate, making it impossible to reliably rotate the antenna at right angles. Also,
Due to the damage described above, the polarization plane cannot be switched sufficiently.

SUMMARY OF THE INVENTION The present invention solves the above problems, provides a reliable structure with fewer injuries to personnel (without using metal materials that reflect electromagnetic waves), and provides a reliable structure without being affected by the elongation and contraction of the belt. It is an object of the present invention to provide a drive device with a simple configuration and low cost that can switch the vertical and horizontal polarization planes of an antenna and has high reliability.

Means for Solving the Problems> In order to solve the above-mentioned problems and achieve the above-mentioned objects, the present invention provides a method in which a gear is attached to the rotating shaft of the antenna, a toothed belt is engaged with the gear, and a toothed belt is engaged with the gear. The rotation axis of the antenna is rotated by vertical movement of the toothed heald, and a stopper mechanism is provided on the rotation axis of the antenna to limit rotation of the antenna.

Function> The present invention rotates the antenna by moving the toothed belt up and down and rotating the teeth (a gear provided on the rotating shaft of the antenna that engages with the T-belt). A stopper mechanism provided on the rotating shaft positions the antenna vertically or horizontally to vary the plane of polarization of the antenna.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

The antenna drive device according to the present invention is for switching the vertical or horizontal polarization plane of an antenna 4 used in a device for measuring unnecessary electromagnetic waves emitted from an electronic device 2 or the like as described above.

The measuring device for measuring the unnecessary electromagnetic waves to which the antenna driving device according to the present invention is applied is composed of 1 (1 shielded drive mechanism storage base 1) as shown in FIG.
A rotary mounting table 3 on which an electronic device 2 or the like as an object to be measured is placed, and an elevating antenna 4 disposed at a position facing the rotary mounting table 3 are arranged on the top. The elevating antenna 4 is mounted on the rotary mounting table 3 of the base l.
Elevating housing 2 is mounted on a pillar erected in a position facing the
It is attached via 1. Note that the pillar is supported by a pillar support section 19 housed within the base 1.

As shown in FIGS. 3 and 4, the lifting device for lifting and lowering the antenna 4 holds the antenna 4 and lifts and lowers the antenna 4 on the support column 5 by driving the first toothed belt 20. It consists of a lifting housing 21 and a drive motor 22 that rotationally drives the first toothed bell 20. The first toothed belt 20 is disposed in the height direction of the column 5 between a first rotary pulley 23 provided at the upper end of the column 5 and a drive pulley 24 provided at the lower end of the column 5,
It is connected to the lifting housing 21 at connecting portions 25 and 26. The first toothed belt 20 is moved up and down by the rotation of the drive pulley 24. That is, the drive pulley 24 is rotationally controlled and rotated by the drive motor 22 provided in the antenna drive section 30, and transmits this rotational force to the first toothed belt 20.

Next, as shown in FIG. 2, the lifting housing 21 has the pillar 5 pushed through it in the height direction, and four rotary rollers 27 are placed at two upper and lower locations surrounding the pillar 5 on all sides. installed on. And this elevating type housing 21
The first toothed belt 20 connected on one side of the
By driving the drive motor 22 shown in FIG. 5 and rotating the drive pulley 24, the elevating housing 21 can be moved up and down on the support column 5.

Further, on the other side of the lifting housing 21, bearings 33 and 34 that rotatably support a rotating shaft 31, which will be described later, support the rotating shaft 31 in a direction perpendicular to the lifting direction of the lifting housing 21. installed to do so.

Next, the antenna drive device according to the present invention that rotationally drives the antenna 4 is configured as shown in FIGS. 1 and 2. That is, the antenna drive device according to the present invention includes a rotating shaft 31 to which the antenna 4 is attached and which serves as the center of rotation of the antenna 4, a gear 32 attached to the rotating shaft 31, and a bearing 33, 34 for the rotating shaft 31. an elevating housing 21 that is attached to the supporting column 5 through which the antenna 4 ascends and descends, and a rotating shaft 31 that is attached across the height of the supporting column 5 and supported by the elevating housing 21; The main components are a second toothed belt 36 that meshes with the gear 32 to rotate the antenna 4, and a stopper mechanism 35 that controls the rotation of the rotating shaft 31.

The rotating shaft 31 to which the antenna 4 is attached is made of a resin material containing glass reinforced fibers, etc., formed into a pipe shape, and as shown in FIG. The antenna 4 is inserted into a large-diameter pipe 138 that is rotatably supported by the lifting housing 21 that lifts and lowers the antenna 4, and by changing the locking position of the small-diameter pipe 37, the antenna 4 can be moved in the front-back direction. It is considered possible.

The large-diameter pipe 38 supported by the lifting housing 21 of the rotating shaft 31 includes the lifting housing (the lifting housing).
A polarization shaft 4° to which a rotation operating member for rotating the rotation shaft 31 is attached is integrally fitted in a position corresponding to the rotation shaft 31. Both ends of this polarization axis 40 are connected to bearings 33. which are provided in the lifting housing 21.
34 supports this lifting housing 21 in a direction perpendicular to the column 5 which is raised and lowered.

The polarization axis 40 is formed into three types of continuous rings with large diameters starting from the left side in FIG. A gear 32 is loosely fitted.

A pair of O-rings 42 and 43 made of elastic members are disposed on both sides of the gear 32. The pair of O-rings 42 and 43 are attached to a support shaft 44 on the polarization axis 40.
However, it is made slidable in the axial direction of the polarization axis 40. One of the pair of O-rings 42, 43 has a polarization axis 4o.
Due to the step 46 between the large diameter ring portion 45 and the arrow a in FIG.
While the sliding in the direction is restricted, the other O ring 43
is pressed toward one O-ring 42 via the gear 32, and controls the rotational torque of the gear 32 with respect to the polarization axis 4o. That is, a pair of torque setting screws 48 and 49 are screwed into the small diameter ring portion 47 of the polarization axis 40, and these torque setting screws 48 and 49 move the other O ring 43 to the one O ring 42 side. By pressing, the pair of O-rings 42, 43 sandwich the gear 32. Therefore, when the gear 32 rotates, the polarization axis 40 also rotates, but when the rotation of the polarization axis 40 is restricted, the gear 32 moves to the O-ring 42. .43 and only the gear 32 rotates.

Next, the stopper mechanism 35 for regulating the amount of rotation of the polarization axis 40 is constructed as follows. First, the large-diameter ring portion 41 of the polarization axis 40 has first and second contact members 50 provided with contact surfaces in directions perpendicular to the outer periphery thereof.
．． 51 is installed. First and second stopper members 52.53 are disposed on the lifting housing 21 at positions corresponding to the abutment members 50.51. This stopper member 52, 53 is a screw shaft 52a.

53a allows adjustment of the stop position of the abutment member 50.5i.

As shown in FIG. 2, the first contact member 50 is brought into contact with a first stopper member 52. As shown in FIG. When the polarization axis 40 is rotated clockwise in FIG. 2 from this state, when the polarization axis 40 is rotated at right angles, the second contact member 51
comes into contact with the second stopper member 53, and rotation of the polarization axis 40 is restricted. Moreover, conversely, the second abutting member 51
When the polarization axis 40 is in contact with the stopper member 53 of
When the polarization axis 40 rotates at right angles in the counterclockwise direction in FIG. Rotation is restricted.

The lifting housing 21 also includes the gear 32 of a rotation shaft 31 that is rotatably supported by the housing 21.
Idle rollers 55 and 56 for engaging the second toothed heald 36 with the gear 32 are rotatably mounted at positions corresponding to the upper and lower sides. Therefore, when the second toothed heald 36 is moved relative to the lifting housing 21, the second toothed belt 36
The gear 32 engages with the teeth of the gear 32 and rotates as the second toothed belt 36 moves up and down, thereby creating a polarization axis 40 that is linked to the rotation of the gear 32.
is rotated, and the rotating shaft 31 is further rotated.

Next, the second toothed belt 36 that engages with the gear 32 that rotates the polarization axis 40 to which the rotation axis 31 of the antenna 4 is fitted is provided across the length of the support 5. and can be driven by the drive motor 22 provided on the lower end side of the support column 5. That is, the second toothed heald 36 is interlocked with the second rotary pulley 60 provided at the tip of the column 5 and the drive pulley 24 provided at the lower end of the column 5, as shown in FIG. It is wound around the inside and outside of the support 5 between the pulley 61 and the pulley 61. When the driving pulley 24 for raising and lowering the lifting housing 21 is rotated by the driving motor 22, the interlocking pulley 61 interlocked with the driving pulley 24 is rotated in the opposite direction to move the second toothed belt 36. Rotate.

Therefore, when the elevating housing 21 is normally raised or lowered by driving the driving pulley 24 and moving the first toothed heald 20, the second toothed heald 36 rotated by the interlocking pulley 61 moves. are also moved synchronously, so in the elevating housing 21, the gear 32 and the second toothed heald 36 do not move relative to each other, and the rotating shaft 3 is not rotated.

Therefore, when the elevating housing 21 moves up and down, the vertical or horizontal polarization plane of the antenna 4 attached to the rotating shaft 31 does not switch.

The vertical or horizontal polarization plane of the antenna 4 is switched by disengaging the interlocking pulley 61 from the drive pulley 24. That is, when the elevating housing 21 is raised or lowered, the clutch C of the interlocking pulley 61 that interlocks with the driving pulley 24 is removed, and the driving pulley 24
Cancel synchronization with Then, the second toothed belt 3
6 is stopped, and the elevating housing 21 is moved relative to this. Therefore, the gear 32 that engages with the second toothed belt 36 is rotated, and the gear 32
Along with the zero rotation, the polarization axis 40 rotates. This rotation of the polarization axis 40 causes the rotation axis 31 to rotate, and the vertical or horizontal polarization plane of the antenna 4 is switched. When the polarization axis 40 is rotated at right angles, one of the contact members 50.5
One stopper member 5 to which the contact surfaces of 1 correspond, respectively.
2 or 52, and rotation of the polarization axis 40 is restricted.

The gear 32 has a stroke longer than the rotating direction of the polarization axis 40, and after the contact member 50 or 51 is completely brought into contact with the stopper member 52 or 53, the O-ring 42
．． 43, and only this gear 32 rotates idly.

Next, the height position regulation of the antenna 4 and the switching operation of the vertical or horizontal polarization plane of the antenna 4 by the antenna drive device configured as described above are performed by controlling the antenna drive unit 30 as shown in FIG. .

In FIG. 5, a drive motor 22 operates a drive boo 1124 for driving the first toothed heald 20, and is connected to a drive pulley 24 via a torque limiter R and an off-brake B1. The rotational force of this drive motor 22 is transmitted. The off-brake B1 is provided to prevent the elevating housing 21 from descending when the power is turned off.

Further, the driving force of the drive motor 22 is transmitted from the first gear 65 to the interlocking pulley 614 that drives the second toothed belt 36 via the second gear 66. Therefore, when the drive motor 22 is rotated, the interlocking pulley 61 is also rotated, and the second toothed belt 136 is rotated in synchronization with the first toothed belt 20.

In the figure, C indicates a clutch, and B2 indicates a brake of this interlocking pulley 61. That is, this clutch C and brake B2
By disengaging the interlocking pulley 6I from the drive pulley 24, the plane of polarization of the antenna 4 attached to the lifting housing 21 can be switched.

Further, the second gear 66 is connected to a third gear 67. The rotating wheel 68 of the third gear 67 is connected to an antenna position sensor 69 to confirm and regulate the position of the antenna 4. In the antenna position sensor 69, S1 is a lower limit position sensor, and S2 is an upper limit position sensor. Also,
S3 is a deceleration sensor, and S4 is a 1 m position sensor above the ground.

When the power is turned on, the elevating housing 21 to which the antenna 4 is attached automatically descends from the stop position on the support column 5, and when the elevating housing 21 passes over the 1m position sensor S4 above the ground, the antenna 4 The height position is recognized. After recognizing the height position of antenna 4,
The drive motor 22 is rotated to move the antenna 4 to the support 5.
Set the position at any height above. This position setting is performed by controlling the rotation speed of the drive motor 22 by a controller 70 consisting of a microcomputer or the like.
This is performed by recognizing the distance of the antenna 4 from the above-mentioned 1 m position above the ground. Then, when approaching a desired position, the clutch C is released and the interlocking pulley 6
1 is stopped, and the movement of the second toothed belt 36 is stopped. Then, the elevating housing 21 moves relative to the second toothed heald 36, and the rotating shaft 3
1 can be rotated to switch the plane of polarization of the antenna 4 between vertical and horizontal.

In this embodiment, all components disposed on the base 1 are made of synthetic resin except for the main body of the antenna 4 and the coaxial cable 9 for transmitting the received signal of the antenna 4. The coaxial cable is insulated and shielded, and the base 1 is also electromagnetically shielded to prevent electromagnetic waves from the internal drive mechanism from being radiated to the outside.

Therefore, no metal material is used in the components disposed on the base 1, so as not to affect the receiving antenna characteristics of the antenna.

<Effects of the Invention> According to the present invention, the antenna can be rotated by moving the toothed belt up and down and rotating the gear provided on the rotating shaft of the antenna that engages with the toothed belt. Furthermore, the plane of polarization of the antenna can be varied by vertically or horizontally positioning the antenna using a stopper mechanism provided on the rotation axis of the antenna.

Therefore, the present invention provides a reliable structure with less damage without using metal materials that reflect 11 waves, and
It is possible to provide a highly reliable drive device with a simple configuration and at low cost that can reliably switch the vertical and horizontal polarization planes of an antenna without being affected by the elongation and contraction of the belt.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing an antenna driving device according to the present invention, and FIG. 2 is a view taken along the line A--A in FIG. 1. FIG. 3 is a side view showing the antenna driving device according to the present invention attached to a support, and FIG. 4 is a front view thereof. FIG. 5 is a reference diagram for explaining the drive mechanism of the antenna drive device according to the present invention. FIG. 6 is a schematic diagram illustrating a measuring device to which the present invention is applied. Moreover, FIG. 7 is a front view showing a conventional antenna driving device, and FIG. 8 is a side view thereof. 4... Antenna 31... Rotating shaft 32... Gear 35... Stopper mechanism 36... Second toothed heald 40... Polarization axis

Claims (1)

[Claims] A gear is attached to the rotating shaft of the antenna, a toothed belt is engaged with the gear, and the vertical movement of the toothed belt rotates the rotating shaft of the antenna, and a stopper mechanism is provided on the rotating shaft of the antenna to rotate the antenna. Antenna drive device with limited