JP5334210B2 - Antenna holding structure - Google Patents

Description

  The present invention relates to an antenna holding structure, and more particularly, to a holding structure for an SMA (Sub Miniature type A) type screw-fixed antenna.

  In a wireless communication apparatus having an antenna, it is one of the important items in the specification to ensure and maintain the wireless characteristics to the maximum. In particular, in the case of a radio communication base station device (master unit) having an external antenna, a structure is required to keep the antenna mounting angle constant so that the relative angle with the radio communication terminal device (slave unit) does not change. It is.

  There are a wide variety of antenna types, including an angle type with an L-shaped angle fixed, a tiltable type that can be bent into an L-shape, and a vertical fixed type that is fixed vertically to the device. If there is, there is no worry that the mounting angle of the antenna tilts.

  10 is an assembly view of an example of an antenna holding structure related to the present invention, FIG. 11 is a completed view of an example of the antenna holding structure, and FIG. 12 is a perspective view of an example of a device having the antenna. 10 to 12 show an example of a device having an SMA type collapsible radio antenna.

  As shown in FIGS. 10 and 11, in general, in the SMA type radio antenna, the screw portion 2 of the antenna connector 1 is fixed to the mounting bracket 3 with the washer 4 and the nut 5, and the screw portion 2 protruding from the mounting bracket 3. Further, the nut portion 6 of the antenna body 7 is fastened and fixed. The rotation of the antenna body 7 and the nut portion 6 is independent, and the angle of the antenna body 7 is not fixed even if the nut portion 6 is tightened strongly. Therefore, as shown in FIG. 12, even after the antenna 9 is fixed to the device 8, the antenna 9 can freely rotate in the rotation direction 10 and can be tilted in the bending direction 11.

  On the other hand, as another example of an antenna holding structure related to the present invention, a technique for fixing an antenna by mounting the antenna on a fixing member (housing) provided in a wireless device is disclosed (for example, Patent Document 1). reference).

  Furthermore, as another example of the antenna holding structure related to the present invention, the GPS antenna is positioned by engaging the claw portion provided at the bottom of the cylindrical GPS antenna with the claw receiving portion provided at the top of the housing. And the technique of inserting the base part (holder part) of a portable radio | wireless antenna in a GPS antenna and fixing a portable radio | wireless antenna is disclosed (for example, refer patent document 2).

JP 2004-253841 A JP 2003-204215 A

  However, in the related invention described in FIG. 10 to FIG. 12, the radiation characteristics are also shifted due to the change in the angle of the antenna under the device usage situation where the antenna installation location and the transmission / reception destination are specified. There is a drawback in that the maximum value of the communication characteristics with the destination is reduced. That is, as the inclination of the antenna increases, stable transmission / reception becomes impossible and communication may be disabled.

  On the other hand, if the antenna is firmly fixed to the device housing in order to keep the antenna mounting angle constant, the antenna may be damaged due to external impact or operator contact, etc. . In addition, there are a number of custom-made antennas whose angles are fixed by a single component, and there is a drawback that the antenna becomes expensive.

  Furthermore, in an antenna having a structure that is fixed with a screw such as an SMA type antenna, due to the loosening of the screw due to vibration or impact due to the screw fixing structure, the screw is separated from the terminal and the radio characteristics are deteriorated, or the antenna is There is a risk of falling off the device housing.

  The invention described in Patent Document 1 is common to the present invention in that the antenna is attached to the fixing member, but there is no description about the “claw portion” of the fixing member. Further, the antenna is a fixing member (housing). The structure is completely different from the present invention in which the antenna is fixed without using a special screw. Therefore, the invention described in Patent Document 1 cannot provide the same effect as the present invention.

  Further, in the invention described in Patent Document 2, the claw portion of the GPS antenna does not have a flexible structure, and therefore the invention described in this document cannot exhibit the same effect as the present invention.

  Therefore, an object of the present invention is to fix the angle of the antenna at a specified position, and to release the fixing when an external force is applied to the antenna to prevent the antenna and the fixing part from being damaged. It is to provide a possible antenna holding structure.

In order to solve the above-described problems, an antenna holding structure according to the present invention includes a housing, an antenna attached to the housing by being connected to an antenna connector provided in the housing, and the antenna inserted. and a cylindrical portion, the claw portion in the tubular portion, wherein the housing is provided a hole portion for engaging the said claw portions are each gap between the antenna and the cylindrical portion is less than a predetermined value And the arm part of the claw part is set to a length that is easy to bend.

  According to the present invention, the angle of the antenna can be fixed at a specified position, and when an external force is applied to the antenna, the fixing can be released to prevent the antenna and the fixing component from being damaged. It becomes.

It is a schematic diagram which shows the principle of operation of the antenna holding structure which concerns on this invention. It is an assembly drawing of 1st Embodiment of the antenna holding structure which concerns on this invention. It is a completion figure of 1st Embodiment of the antenna holding structure which concerns on this invention. It is a schematic diagram which shows the effect of 1st Embodiment. It is an assembly drawing of 2nd Embodiment of the antenna holding structure which concerns on this invention. It is a completion figure of 2nd Embodiment of the antenna holding structure which concerns on this invention. It is an assembly drawing of 3rd Embodiment of the antenna holding structure which concerns on this invention. It is a completion drawing of the third embodiment. It is an AA section sectional view of the 3rd embodiment. It is an assembly drawing of an example of the antenna holding structure relevant to this invention. It is a completion figure of an example of the antenna holding structure. It is a perspective view of an example of a device which has the antenna.

  First, before describing the embodiments, the features and operating principles of the present invention will be described. A feature of the present invention is that a general-purpose antenna, that is, an antenna having a degree of freedom of angle adjustment, can fix the angle at a specified position, hold the antenna within a certain angular range at a cylindrical portion, and a device The antenna fixing structure is such that the position of the antenna remains unchanged by fixing the nail to the main body. Furthermore, the feature of the present invention lies in that the fixing structure can be easily removed even when an unexpected external force is applied to the antenna, so that no parts are broken and the antenna can be fixed again.

  Next, the operation principle of the present invention will be described. FIG. 1 is a schematic view showing the operating principle of an antenna holding structure according to the present invention. Referring to the figure, an antenna holding structure according to the present invention includes an antenna 101, a cylindrical part (fixed part) 102 into which the antenna 101 is inserted, and a casing 103 to which the cylindrical part 102 is attached. The shape portion 102 is provided with a claw portion (hanging and fixing structure) 104, and the housing 103 is provided with a hole portion 105 for locking the claw portion 104. And the clearance gap between the antenna 101 and the cylindrical part 102 is set to below a predetermined value, and the arm part 106 of the nail | claw part 104 is set to the length which is easy to bend.

  That is, the antenna 101 is fixed to the housing 103 by the cylindrical portion 102 that is slightly larger than the outer shape of the antenna 101 and the claw portion 104 that can be hooked and fixed to the hole 105 of the apparatus housing 103. As a result, even if the antenna 101 is bent or rotated in the rotation direction, the antenna 101 comes into contact with the inner wall of the cylindrical portion 102 and stops, and the angle does not fall over a certain range. Even a general-purpose antenna with a certain degree of freedom can be fixed at a specified angle.

  Furthermore, by keeping the distance between the outer shape of the antenna 101 and the inner diameter of the cylindrical portion 102 relatively narrow, the angle of the antenna 101 can be kept within a relatively narrow range. In addition, in an antenna having a fixing method using screws such as an SMA type, the distance between the claw portion 104 and the hole portion 105 is relatively narrow so that the position of the claw portion 104 hooked and fixed to the housing 103 does not move. As a result, even if the fixing screw of the antenna 101 is loosened, the position of the antenna 101 is maintained as long as the position of the cylindrical portion 102 is not displaced, so that the antenna 101 can be prevented from falling off. it can.

  Furthermore, by setting the arm portion 106 of the claw portion 104 to a length that allows easy bending, the claw portion 104 can be easily detached from the hole portion 105 when an external force is applied to the antenna 101, so that the antenna and the fixing component are damaged. Can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. First, a first embodiment of the present invention will be described. FIG. 2 is an assembly view of the first embodiment of the antenna holding structure according to the present invention. In the figure, a configuration example of a device in which an SMA type retractable radio antenna is mounted outside the device will be described.

  Referring to the figure, the antenna holding structure according to the present invention includes an antenna connector 12, a mounting bracket 13, a washer 14, a nut 15, an antenna body 16, a nut portion 17, a lower housing 18, and an upper portion. The housing 19, the shaft 20, a fixed part (cylindrical part) 21, a claw 22, a rib 23, and a hole (hole part) 24 are included.

  A claw portion 31 including a rib 23 and a claw 22 is provided at a lower portion of the fixed component (tubular portion) 21. In addition, a hole (hole) 24 for locking the claw portion 31 is provided on the upper surface of the lower housing 18.

  The SMA type antenna connector 12 is fixed to the mounting bracket 13 with a washer 14 and a nut 15, and the tip screw portion of the antenna connector 12 penetrating the nut 15 and the nut portion 17 of the antenna body 16 are fastened and fixed. The mounting bracket 13 to which the antenna connector 12 and the antenna body 16 are fixed is fixed to the lower housing 18.

  The upper casing 19 is put on the lower casing 18 and fixed. The antenna main body 16 has a shape bent in an L shape around the shaft 20, and passes through the cylindrical portion of the fixed component (cylindrical portion) 21 from the tip portion of the antenna main body 16 to the claw portion 31 of the fixed component (cylindrical portion) 21. Is inserted into the hole (hole) 24 of the lower housing 18.

  FIG. 3 is a completed view of the first embodiment of the antenna holding structure according to the present invention. 2A is a perspective view of the antenna holding structure, and FIG. 2B is a cross-sectional view of the vicinity of the claw portion 31 and the hole (hole portion) 24. FIG.

  Referring to FIG. 2A, the housing body is configured by covering the lower housing 18 with the upper housing 19. The lower casing 18 is a rectangular box, whereas the upper casing 19 is an L-shaped box. Therefore, when the lower casing 18 is covered with the upper casing 19, a part of the upper surface of the lower casing 18 is placed. 18a is exposed. A hole (hole) 24 is formed in a part 18 a of the upper surface, and the claw portion 31 of the fixed component (tubular portion) 21 is inserted into the hole (hole) 24. Further, the base portion of the antenna body 16 is fixed inside the housing body through a hole portion 19 a provided on the side surface of the upper housing 19.

  Referring to FIG. 5B, the fixed component (tubular portion) 21 is fixed by sandwiching the lower housing 18 between the claws 22 and the ribs 23. Moreover, the part (arm part) in which the nail | claw 22 and the rib 23 of the fixing | fixed component (tubular part) 21 are formed is set to the length which is easy to bend, when the unexpected external force is added to the antenna main body 16. .

  Next, the operation of the first embodiment will be described. As shown in FIG. 12, there are two angles of the antenna 9, that is, the bending direction 11 and the rotation direction 10 of the antenna 9. That is, referring to FIGS. 3A and 3B, if the antenna 16 rotates in either direction, the outer shape of the antenna 16 comes into contact with the inside of the cylindrical portion of the fixed component (cylindrical portion) 21. It won't fall over any angle.

  For example, by holding the outer shape of the antenna 16 and the inner wall of the fixed part (cylindrical part) 21 with a gap of about 0.25 mm at a point about 15 mm bent from the shaft 20 of the antenna 16, The error of the angle of the antenna 16 can be kept within ± 1 degree. This state in which the angle error of the antenna 16 is ± 1 degree or less is a level that does not affect the wireless characteristics of the antenna in the apparatus at all, thereby enabling stable wireless communication.

  Further, when an unexpected strong external force is applied to the antenna 16, the claw 22 comes off the hole (hole) 24 when the claw 22 of the fixed component (cylindrical part) 21 has an allowable force or more. And no parts are damaged. In this case, it can be seen visually that an external force has been applied to the antenna 16 and the angle of the antenna 16 has changed due to the removal of the fixed component (tubular portion) 21. For this reason, the operator is alerted, and the angle of the antenna 16 can be held again by fixing the detached fixed part (cylindrical part) 21 again.

  Further, the SMA type antenna 16 may loosen in the nut portion 17 due to vibration or the like. As the looseness occurs, the antenna 16 moves in the direction in which the antenna 16 comes off, and finally the terminal connection of the antenna 16 is disconnected, which is the worst. In this case, the antenna 16 may fall off.

  On the other hand, if the gap in the direction in which the antenna 16 is pulled out between the claw 22 of the fixed component (cylindrical part) 21 and the hole (hole part) 24 of the lower housing 18 is kept below the screw pitch of the nut part 17, Even if the nut portion 17 is loosened, the nut portion 17 does not exceed one turn, and it is possible to prevent the terminal connection of the antenna 16 from being disconnected and the antenna 16 from falling off.

  As described above, according to the first embodiment of the present invention, it is possible to keep the angle of the antenna 16 within a certain range in both the rotation direction and the bending direction of the antenna 16. FIG. 4 is a schematic diagram showing the effect of the first embodiment. As shown in the figure, by keeping the angle of the antenna 16 constant (see the left figure in the figure), even when the antenna 16 is inclined (see the right figure in the figure), the antenna 16 with respect to the transmission / reception surface is also shown. The radiation characteristics can be maintained at a maximum and constant, and stable communication with the transmission / reception destination can be performed. In addition, this makes it possible to use a general-purpose antenna with a degree of freedom of angle adjustment, and to replace a vertically fixed antenna that cannot change the angle. Therefore, the types of antennas that can be selected are increased, and a flexible device design can be realized. It becomes possible.

  In addition, according to the present invention, it is possible to prevent the antenna 16 from falling off. In the case of a screw-fixed antenna, there is a risk of loosening of the screw due to vibration, and in the case of a claw-fixed antenna, there is a risk of detachment of the nail due to external force. However, the antenna is physically used by the fixing component (tubular portion) 21 of the present invention. Since 16 cannot move in the removal direction, the antenna 16 does not fall off due to the loosening of the screws or the removal of the claws 22.

  In addition, this makes it possible to use SMA type antennas that are not suitable for installation sites where vibrations are applied in related technologies because of the risk of loosening of screws, and the types of antennas that can be used increase. Therefore, it is possible to realize a flexible device design.

  Next, a second embodiment of the present invention will be described. Due to restrictions such as the size of the device and the shape of the housing, the housing fixing hole may not be provided below the antenna as in the first embodiment. An application example in that case will be described in the second embodiment.

  FIG. 5 is an assembly diagram of the second embodiment of the antenna holding structure according to the present invention. Referring to the figure, the antenna holding structure according to the present invention includes an antenna connector 12 ', a mounting bracket 13', a washer 14 ', a nut 15', an antenna body 16 ', a nut portion 17', and a lower portion. The housing 18 ', the upper housing 19', a fixed part (cylindrical portion) 21 ', a claw 22', a rib 23 ', and a notch (hole) 24' are configured. . Further, the claw portion 31 ′ is constituted by the claw 22 ′ and the rib 23 ′.

  The basic configuration is the same as that of the first embodiment described above, but the fixing component (cylindrical portion) 21 ′ is hooked and fixed to the cutout portion (hole portion) 24 ′ on the side surface of the upper housing 19 ′.

  FIG. 6 is a completed view of the second embodiment of the antenna holding structure according to the present invention. FIG. 4A is a perspective view of the antenna holding structure, and FIG. 4B is a cross-sectional view in the vicinity of a claw portion 31 ′ and a cutout portion (hole portion) 24 ′.

  Referring to FIG. 5A, the fixing component (cylindrical portion) 21 ′ is hooked and fixed to the cutout portion (hole portion) 24 ′ on the side surface of the upper housing 19 ′. Referring to FIG. 5B, the upper part 19 'is sandwiched between the claws 22' and the ribs 23 'of the fixed part (tubular part) 21', so that the fixed part (tubular part) 21 'is It fixes to upper housing | casing 19 '.

  As described above, according to the second embodiment of the present invention, even when the fixing hole of the housing is not provided on the lower side of the antenna, it is possible to obtain the same effect as that of the first embodiment. Become.

  Further, the present invention can be applied to an angle type antenna that is fixed in an L shape other than the SMA type or a folding type antenna that can be bent, with the same configuration as the first or second embodiment described above. This makes it possible to keep the antenna angle within a certain range and to prevent the antenna from dropping off.

  Next, a third embodiment of the present invention will be described. The third embodiment relates to an antenna holding structure for a vertically fixed antenna (bar-shaped antenna). FIG. 7 is an assembly view of the third embodiment of the antenna holding structure according to the present invention, FIG. 8 is a completed view of the third embodiment, and FIG. 9 is a cross-sectional view of the AA portion of the third embodiment.

  Referring to FIG. 7, the third embodiment of the antenna holding structure includes a fixed component (cylindrical portion) 27, an antenna body 25, a protruding portion (projecting shape) 26, and a housing 28. . The antenna body 25 is provided with a protrusion (projection shape) 26 that protrudes one step outward from a part or the entire periphery of the antenna body 25.

  As shown in FIG. 9, the antenna body 25 is formed by pressing the protrusion (protrusion shape) 26 with a fixing component (cylindrical portion) 27 and hooking the claw of the fixing component (cylindrical portion) 27 into the hole of the housing 28. Is fixed to the housing 28. FIG. 8 shows a completed view of the third embodiment of the antenna holding structure.

  As described above, according to the third embodiment of the present invention, it is possible to prevent disconnection of the antenna connection and dropout of the antenna body 25 even if the screw portion of the antenna body 25 starts to loosen. In particular, when the antenna body 25 is mounted downward, a great effect of the present invention can be obtained.

  The present invention can be applied to a wireless communication apparatus (base station or the like).

12, 12 'Antenna connector 13, 13' Mounting bracket 14, 14 'Washer 15, 15' Nut 16, 16 'Antenna body 17, 17' Nut portion 18, 18 'Lower housing 19, 19' Upper housing
20 Axis 21, 21 'Fixed part (cylindrical part)
22, 22 'Claw 23, 23' Rib 24, 24 'Hole (hole)
25 Antenna body
26 Protrusion (projection shape)
27 Fixed parts (cylindrical part)
28 Case
101 Antenna
102 Cylindrical part (fixed part)
103 housing
104 Claw (Hook fixing structure)
105 holes
106 Arm

Claims (7)

A housing,
An antenna attached to the housing by being connected to an antenna connector provided in the housing;
And a cylindrical portion into which the antenna is inserted,
The tubular portion is provided with a claw portion, and the housing is provided with a hole portion for locking the claw portion,
A gap between the antenna and the cylindrical portion is set to a predetermined value or less, and an arm portion of the claw portion is set to a length that is easy to bend.   2. The antenna holding device according to claim 1, wherein a distance between the claw portion and the hole portion is set to a predetermined value or less so that a position of the claw portion to be engaged with the hole portion of the housing does not move. Construction.   The antenna holding structure according to claim 1 or 2, wherein the antenna has an L shape, and a bent portion of the antenna is held by the cylindrical portion.   The antenna holding structure according to any one of claims 1 to 3, wherein the casing has a box shape, and the antenna and the cylindrical portion are provided on an upper surface portion thereof.   5. The antenna holding structure according to claim 4, wherein the upper surface portion of the casing is configured by two flat surfaces having different heights, and the antenna and the cylindrical portion are provided on a lower surface.   The antenna holding structure according to any one of claims 1 to 3, wherein the casing has a box shape, and the antenna and the cylindrical portion are provided on a side surface portion thereof.   3. The antenna holding structure according to claim 1, wherein the antenna has a rod shape, the housing has a box shape, and the antenna and the cylindrical portion are provided on a bottom surface portion of the housing.

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