JP5070611B2 - Antenna angle variable holding structure - Google Patents

Description

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

  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 the case of a wireless communication terminal device (slave device) having an external antenna, it is necessary to be able to adjust the mounting angle at the site where the device is installed so that the radiation characteristics of the external antenna are maximized and to maintain the angle. In the case of a radio communication base station apparatus (master unit) having an external antenna, a structure is required in which the antenna mounting angle is always kept constant so that the relative angle with the radio communication terminal apparatus (slave unit) does not change. .

  There are a wide variety of types of antennas, such as an angle type with an angle fixed in an L shape, a tiltable type that can be bent into an L shape, and a vertical fixed type that is fixed vertically to a device. However, the antenna mounting angle can be adjusted at the installation site, and it does not have a structure that keeps it constant. In the case of an angle type or a tiltable type antenna, the antenna mounting angle can be adjusted at the installation site of the apparatus, but there is a high possibility that the antenna mounting angle easily changes due to an external force.

  In particular, in the SMA type antenna, since the fixing structure is screw fixing, there is a high risk of screw loosening due to external force, and it is indispensable to solve problems such as maintaining the antenna angle and preventing the antenna from falling off.

  Vertical fixed antennas are usually custom-made in the first place, and antennas are relatively expensive. Therefore, it is desirable that a relatively inexpensive general-purpose fallen antenna can be fixed vertically by an inexpensive method. .

  9 is an assembly view of an example of an antenna holding structure related to the present invention, FIG. 10 is a completed view of an example of the antenna holding structure, and FIG. 11 is a perspective view of an example of a device having the antenna. FIG. 9 to FIG. 11 show an example of a device having an SMA type collapsible radio antenna.

  As shown in FIGS. 9 and 10, in general, the SMA type wireless antenna has a screw portion 2 that protrudes from the mounting bracket 3 by fixing the screw portion 2 of the antenna connector 1 to the mounting bracket 3 with a washer 4 and a nut 5. 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. 11, 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).

  Furthermore, as another example of the antenna holding structure related to the present invention, when the parabolic antenna is attached to the support seat via the seat, the support seat is screwed through the long hole provided in the support seat. A technique for fixing to a seat is disclosed (for example, see Patent Document 3). According to this technique, the elevation angle of the parabola antenna fixed to the seat, that is, the seat can be adjusted by loosening the screw.

JP 2004-253841 A JP 2003-204215 A Japanese Utility Model Publication No. 63-085909

  However, in the related invention described in FIG. 9 to FIG. 11, in the antenna of the base station device or the antenna of the wireless communication terminal whose angle is adjusted at the site where the device is installed, the radiation characteristics are also changed by changing the angle of the antenna. It will shift | deviate and the maximum value of a wireless communication characteristic will fall. As the inclination of the antenna increases, stable transmission / reception becomes impossible and communication may become impossible.

  On the other hand, in a radio communication terminal apparatus and base station apparatus having an antenna outside, it is necessary to adjust the antenna mounting angle so that the radio characteristics are optimized at the installation site of the apparatus. However, since the antenna cannot be fixed firmly after adjusting the angle of the antenna, the mounting angle of the antenna may greatly change due to vibration, external impact, operator contact, or the like.

  Alternatively, in an antenna where the angle cannot be adjusted, the antenna may be damaged due to an external impact or an operator's contact. When the angle of the antenna is tilted, the radiation characteristics of the antenna are also tilted, and the radiation characteristics on the transmission / reception surface deteriorate. Therefore, when the antenna is tilted from a predetermined position, the range in which the antenna can be transmitted and received is narrowed, and the wireless function of the apparatus is greatly impaired.

  In particular, in the case of a base station device, if the mounting angle of the antenna changes, communication of many slave units accessing the antenna becomes unstable or impossible, and there is a risk of causing great damage on the system. In addition, since the SMA type antenna is fixed with screws, loosening due to vibration, impact, or the like may cause the terminals to separate and the radio characteristics to deteriorate, or the antenna to drop off.

  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.

  In the invention described in Patent Document 3, the angle is adjusted by a combination of a screw and a long hole. However, the combination of a claw as in the present invention and a plurality of holes corresponding to the angle of the antenna is completely different. The configuration is different. Therefore, the invention described in this document cannot achieve the same effect as the present invention.

  Therefore, the object of the present invention is to fix the antenna at an arbitrary angle, and once the angle is fixed, it is possible to hold the antenna within a certain angle range and when an external force is applied to the antenna. An object of the present invention is to provide an antenna angle variable holding structure capable of releasing the fixing and preventing the antenna and the fixing component from being damaged.

  In order to solve the above problems, an antenna angle variable holding structure according to the present invention includes an antenna, a cylindrical portion into which the antenna is inserted, and a casing to which the cylindrical portion is attached. Are provided with a hook portion having a plurality of holes for locking the claw portion, and the gap between the antenna and the cylindrical portion is set to a predetermined value or less, and The arm portion of the claw portion is set to a length that allows easy bending, and the hole portion of the housing corresponds to the angle of the tubular portion in order to hold the tubular portion at an arbitrary angle in the housing. A plurality of them are provided.

  Further, another antenna angle variable holding structure according to the present invention includes an antenna, a cylindrical part into which the antenna is inserted, and a casing to which the cylindrical part is attached, and the cylindrical part has a claw part. The housing is provided with a hooking portion having a hole for locking the claw portion, the gap between the antenna and the cylindrical portion is set to a predetermined value or less, and the arm portion of the claw portion Is set to a length that is easy to bend, and the hole of the casing is formed in a polygonal shape so that the casing is held at an arbitrary angle by the casing.

  According to the present invention, the antenna can be fixed at an arbitrary angle, and once the angle is fixed, the antenna can be held within a certain angular range, and when an external force is applied to the antenna, It is possible to prevent the antenna and the fixing component from being broken by releasing the fixing.

It is a schematic diagram which shows the principle of operation of the antenna angle variable holding structure which concerns on this invention. It is a perspective view of an example which inclines and fixes an antenna. It is an assembly drawing of 1st Embodiment of the antenna angle variable 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 sectional drawing of an example in the case of inclining and fixing an antenna. It is a schematic diagram which shows the effect of 1st Embodiment. It is an assembly drawing of 2nd Embodiment of the antenna angle variable holding structure which concerns on this invention. It is a completion figure of 2nd Embodiment of the antenna angle variable holding structure which concerns on this invention. 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. The feature of the present invention is that the angle can be fixed at an arbitrary position in a general-purpose antenna, that is, an antenna having a degree of freedom of angle adjustment. Once the angle is fixed, the antenna is within a certain angle range at the cylindrical portion. The antenna angle variable holding structure is characterized in that the position of the antenna is not changed by fixing the claws to the apparatus 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 the antenna angle variable holding structure according to the present invention. Referring to the figure, the antenna angle variable 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 housing 103 to which the cylindrical part 102 is attached. The tubular portion 102 is provided with a plurality of claw portions (hook fixing structure) 104, and the housing 103 is provided with a hook portion 24 having a plurality of holes for locking the claw portions 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 formed in the hook portion 24 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, since the hook part 24 of the housing 103 has a plurality of holes for locking the claw part 104 of the cylindrical part 102 according to the angle of the cylindrical part 102, a desired hole is selected. Thus, the angle of the cylindrical portion 102, that is, the angle of the antenna 101 can be fixed to a desired angle.

  2A and 2B are perspective views of an example in which the antenna is tilted and fixed, FIG. 2A shows an example in which the antenna is tilted and fixed in the clockwise direction, and FIG. 2B is an example in which the antenna is tilted in the counterclockwise direction. An example of fixing is shown.

  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 the SMA type, the holes of the hook portion 24 and the hook portion 24 of the housing 103 are prevented so that the position of the hook portion 104 to be hooked and fixed to the housing 103 does not move. Since the position of the antenna 101 is maintained as long as the position of the cylindrical portion 102 is not displaced even if the fixing screw of the antenna 101 is loosened, the position of the antenna 101 is maintained. 101 can be prevented from falling off.

  Further, 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 of the hook portion 24 of the housing 103 when an external force is applied to the antenna 101. It is possible to prevent the antenna and the fixing component from being damaged.

  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. 3 is an assembly diagram of the first embodiment of the antenna angle variable 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 component (cylindrical portion) 21, a claw 22, a rib 23, and a hooking portion 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. Further, the lower casing 18 is provided with a hooking portion 24 having a plurality of holes for locking the claw portion 31 of the fixed component (tubular portion) 21 at an arbitrary angle.

  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 of the hook portion 24 of the lower housing 18.

  FIG. 4 is a completed view of the first 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 of the vicinity of the hole portions of the claw portion 31 and the hook portion 24.

  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 hook portion 24 is formed on a part 18 a of the upper surface, and a claw portion 31 of a fixed part (tubular portion) 21 is inserted into a hole portion of the hook portion 24.

  That is, as shown in FIG. 5B, the fixed component (tubular portion) 21 is fixed by sandwiching the hook portion 24 of the lower housing 18 between the claws 22 and the ribs 23. FIG. 2B shows an example in which the hook portion 24 a of the lower housing 18 is sandwiched and fixed between the claws 22 and the ribs 23.

  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.

  FIG. 5 is a cross-sectional view of an example in which the antenna is tilted and fixed. FIG. 2A shows an example in which the antenna is tilted counterclockwise and the hook portion 24b of the lower housing 18 is sandwiched and fixed between the claws 22 and the ribs 23 of the fixing component (tubular portion) 21. ing. FIG. 5B shows an example in which the antenna is tilted clockwise and the hook portion 24c of the lower housing 18 is sandwiched and fixed between the claws 22 and the ribs 23 of the fixing component (tubular portion) 21. Show.

  Referring to FIG. 4B, the portion (arm portion 106) where the claw 22 and the rib 23 of the fixed component (cylindrical portion) 21 are formed bends when an unexpected external force is applied to the antenna body 16. It is set to an easy length.

  Next, the operation of the first embodiment will be described. As shown in FIG. 11, there are two angles of the antenna 9, the bending direction 11 of the antenna 9 and the rotation direction 10. That is, referring to FIGS. 4A and 4B, 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, if the hooking portion 24 of the lower casing 18 sandwiched between the claws 22 and the ribs 23 of the fixed component (tubular portion) 21 is changed to the hooking portion 24b or the hooking portion 24c, the mounting angle of the antenna body 16 is changed. Can be changed (see FIGS. 5A and 5B). As a result, the wireless characteristics of the antenna in the apparatus can be adjusted to an optimum angle and kept within a certain range, and stable wireless communication can be maintained.

  Further, when an unexpected strong external force is applied to the antenna 16, the claw 22 becomes a hole (a hole in the hook portion 24) when the claw 22 of the fixed component (cylindrical portion) 21 becomes more than allowable. Part), 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 body 16 is removed between the claw 22 of the fixed part (tubular portion) 21 and the hooking portion 24 of the lower housing 18 is suppressed to be equal to or less than the screw pitch of the nut portion 17, the nut Even if the 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, the angle of the antenna body 16 in the rotation direction is adjusted and fixed, and the angle of the antenna body 16 is set in both the rotation direction and the bending direction of the antenna body 16. It becomes possible to hold within a certain range.

  FIG. 6 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 diagram on the left side of the figure), even when the antenna body 16 is tilted (see the diagram on the right side of the figure), the antenna with respect to the transmission / reception surface The radiation characteristic of the main body 16 can be kept at the 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 body 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 by an external force. 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.

  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. 7 is an assembly diagram of the second embodiment of the antenna angle variable 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 ′. At this time, the notch (hole) 24 ′ provided on the side surface of the upper housing 19 ′ has a polygonal hole shape.

  FIG. 8 is a completed view of the second embodiment of the antenna angle variable 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. 2A, the antenna body 16 ′ is fixed to the notch (hole) 24 ′ of the upper housing 19 ′ using a fixing component (cylindrical portion) 21 ′. . Referring to FIG. 5B, the wall 25 between the claw 22 ′ of the fixed part (cylindrical portion) 21 ′ and the rib 23 ′ has a shape of three sides of the polygonal surface and the adjacent surface. By matching, the antenna mounting angle can be selected and fixed within the range of the number of polygonal surfaces.

  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. Thus, the antenna can be fixed at an arbitrary angle, can be held within a certain angle range, and the antenna can be prevented from falling off.

  The present invention can be applied to wireless communication devices (communication terminals, base stations, etc.).

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 hook
24 'Notch (hole)
101 Antenna
102 Cylindrical part (fixed part)
103 housing
104 Claw (Hook fixing structure)
106 Arm

Claims (6)

An antenna,
A cylindrical portion into which the antenna is inserted;
A casing to which the cylindrical portion is attached,
The tubular portion is provided with a claw portion, and the housing is provided with a hook portion having a plurality of holes for engaging the claw portion,
The gap between the antenna and the cylindrical part is set to a predetermined value or less, and the arm part of the claw part is set to a length that is easy to bend,
Further, in order to hold the cylindrical portion at an arbitrary angle in the casing, a plurality of hole portions of the casing are provided corresponding to the angle of the cylindrical portion, and the antenna angle variable holding structure is characterized in that .   2. The antenna angle variable holding structure according to claim 1, wherein the antenna has an L shape, and a bent portion of the antenna is held by the cylindrical portion.   The antenna angle variable holding structure according to claim 1 or 2, wherein the casing has a box shape, and the antenna and the cylindrical portion are provided on an upper surface portion thereof.   4. The antenna angle variable holding according to claim 3, wherein the upper surface portion of the casing is constituted by two flat surfaces having different heights, and the antenna and the cylindrical portion are provided on a lower surface. Construction.   The antenna angle variable holding structure according to claim 1 or 2, wherein the casing has a box shape, and the antenna and the cylindrical portion are provided on a side surface portion thereof. An antenna,
A cylindrical portion into which the antenna is inserted;
A casing to which the cylindrical portion is attached,
The tubular portion is provided with a claw portion, and the housing is provided with a hook portion having a hole portion for locking the claw portion,
The gap between the antenna and the cylindrical part is set to a predetermined value or less, and the arm part of the claw part is set to a length that is easy to bend,
Further, the antenna angle variable holding structure is characterized in that the hole portion of the casing is formed in a polygonal shape in order to hold the cylindrical portion at an arbitrary angle in the casing.

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