JP4847430B2 - Portable antenna - Google Patents

Description

  The present invention relates to a portable antenna used for, for example, terrestrial digital broadcast waves, communication, and the like.

  Terrestrial digital (television) broadcasting (ISDB-T: Integrated Services Digital Broadcasting-Terrestrial) uses radio waves in the UHF band, and the frequency band is 470 to 770 MHz (13 to 62 channels). In recent years, services for mobile devices such as mobile phones have been increasingly improved, and terrestrial digital broadcasting for mobile devices, so-called one-segment broadcasting (one-segment broadcasting) has already begun. You can enjoy using it on the go or on the way to work.

  Conventionally, a small antenna for receiving terrestrial digital broadcasts using a plate-like dipole element has been considered (see, for example, Patent Document 1).

  FIG. 18 shows a configuration example of a conventional terrestrial digital broadcast receiving antenna using a plate-like dipole element. In FIG. 18, reference numeral 1 denotes an antenna body, in which a plate-shaped dipole element (not shown) is accommodated in a housing 2 using synthetic resin. On the back side of the housing 2, a mounting bracket mounting portion 3 is provided at the center, and the mounting bracket 4 can be attached to and detached from the mounting bracket mounting portion 3 with screws. In addition, on the back surface of the housing 2, for example, a feeding plug 5 is provided on the side of the mounting bracket mounting portion 3.

  When the antenna body 1 is attached to the mast 6, the attachment metal fitting 4 is previously attached to the attachment metal attachment portion 3 provided on the rear surface of the antenna body 1 with screws, and then attached to the mast 6 via the attachment metal fitting 4. . FIG. 18 shows a state in which the antenna body 1 is positioned in the horizontal direction to receive horizontal polarization.

  Further, in the case of receiving vertically polarized waves by the antenna, as shown in FIG. 19, the mounting bracket 4 is mounted on the mounting bracket mounting portion 3 of the antenna body 1 by rotating 90 ° from the horizontal polarization state, When attached to the mast 6, the antenna body 1 is positioned in the vertical direction.

Further, when the antenna is used as an indoor antenna, a dedicated stand 7 is attached to the mounting bracket mounting portion 3 as shown in FIG.
Design Registration No. 1235674

  Since the conventional antenna is attached to the mast 6 using the mounting bracket 4, it takes time and effort to tighten the screws, and the attachment to the mast 6 is troublesome.

  In addition, when the antenna is used independently for indoor use, it is necessary to attach a dedicated stand 7. In this case, since the antenna shape becomes longer in the electric field plane direction, both horizontal polarization reception and vertical polarization reception cannot be made independent.

  As described above, when the conventional antenna shares the function of being attached to the mast 6 and the function of being self-supporting, separate parts such as the mounting bracket 4 and the stand 7 are required, which is cumbersome and costly to manage the parts. There was a problem of becoming.

  In addition, in order to receive digital terrestrial broadcasting (one-segment broadcasting) on the go with a mobile phone or the like, a small and lightweight portable antenna is required. However, although the conventional antenna shown in FIG. 18 can be used as an indoor antenna, it is not yet reduced in size so that it can be carried outside.

  The present invention has been made in order to solve the above-mentioned problems. The directivity can be arbitrarily variably set by changing the antenna shape, and it is not necessary to provide an existing antenna. It is an object of the present invention to provide a portable antenna that can handle any of the polarized waves and can be used as an external antenna of a mobile device by carrying it to an outside location.

  A portable antenna according to a first aspect of the present invention is configured to pivotally support between a substantially rectangular first to fourth antenna cover that is sequentially connected and a second and third antenna cover located on the center side. A movable central portion configured respectively at a central movable shaft of the shaft, a connecting portion between the first antenna cover and the second antenna cover, and a connecting portion between the third antenna cover and the fourth antenna cover; A flexible plate-like antenna element housed in the first to fourth antenna covers, and the first to fourth antenna covers are rotated by the central movable shaft and the movable shaft portion. It is configured to be deformable.

  According to a second aspect of the present invention, in the portable antenna according to the first aspect of the present invention, a cable holding portion that holds a feeding cable is integrally provided on an outer side portion of the central movable shaft.

  According to a third aspect of the present invention, in the portable antenna according to the first aspect of the present invention, the movable shaft provided at the connecting portion between the first and second antenna covers and between the third and fourth antenna covers is an antenna element. It is characterized by comprising a pair of bearing cylinders having a gap through which the antenna element is inserted and holding the antenna element so that the antenna element is not exposed to the outside even when the antenna shape is changed.

  According to a fourth aspect of the present invention, in the portable antenna according to the second aspect of the present invention, the cable holding portion provided on the central movable shaft includes a clip attachment portion to which a clip for attaching the antenna to the fixed object is detachable. It is characterized by that.

  According to the present invention, since the directivity can be variably set by changing the shape of the antenna, the antenna can be installed in an arbitrary place without having to be installed, and can be easily moved to an arbitrary place.

  In addition, since the shape, installation direction, and directivity of the antenna can be freely changed, it is possible to set an optimal reception state in accordance with user conditions. Furthermore, since the antenna can be folded, it is easy to carry and can function not only as an indoor antenna but also as an external antenna of a mobile device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 shows a configuration example of a portable antenna 10 according to a first embodiment of the present invention. FIG. 1 (a) is a perspective view showing a configuration when the portable antenna 10 is folded into two and put into a storage state. (B) is a perspective view which shows the form when the portable antenna 10 is expand | deployed planarly, and it is set as the maximum receiving state, (c) shows the form when it is bent into a square cylinder shape and it is set as the omnidirectional receiving state. It is a perspective view. FIG. 2 is a front view showing the antenna element 12 accommodated in the antenna cover 11 of the portable antenna 10 in a flat shape.

  As shown in FIG. 1, the antenna cover 11 includes first to fourth covers 21 to 24 made of an insulating material such as synthetic resin, and the antenna element 12 is accommodated therein. The first to fourth covers 21 to 24 are rotatably connected by a biaxial central movable shaft 25 and side movable shafts 26 and 27 made of an insulator, for example, synthetic resin. In addition, the first cover 21 and the fourth cover 24 located on both sides are provided with coupling portions 28 and 29 so that they can be arbitrarily separated and coupled.

  In addition, a cable holding portion 32 that holds the power supply cable 31 is provided below the outer side of the central movable shaft 25. The feeding cable 31 held by the holding cable holding part 32 is inserted into the antenna cover 11 at the tip, and the center conductor and the outer conductor are connected to the feeding point 16 of the antenna element 12.

  As described above, the first to fourth covers 21 to 24 are rotatably connected by the central movable shaft 25 and the side movable shafts 26 and 27, so that the first to fourth covers 21 to 24 are folded into two as shown in FIG. 1 (b), flattened as shown in FIG. 1 (b) (maximum reception state), or bent 90 degrees as shown in FIG. 1 (c) to form a rectangular tube (nothing) In a directional reception state). Details of the antenna cover 11, the central movable shaft 25, and the side movable shafts 26 and 27 will be described later.

  As shown in FIG. 2, the antenna element 12 is formed in a rectangular shape having a full length L and a height H by using a flexible film conductor or thin film conductor, and a substantially T-shaped slot 13 is provided at the center. Thus, plate-shaped dipole elements 14a and 14b are formed on the left and right. The antenna element 12 is set, for example, to have an overall length L of about 0.35λa and a height H of about 0.1λa. The λa indicates the wavelength of the lower end frequency 470 MHz in the UHF frequency band 470 to 770 MHz, for example.

  The plate-like dipole elements 14 a and 14 b are provided with a cut groove 15 below the slot 13, and feed points 16 are provided above the cut groove 15 so as to be positioned on both sides of the lower portion of the slot 13. Furthermore, a plurality of, for example, four claw insertion holes 17 are provided in the plate-like dipole elements 14 a and 14 b so as to be positioned on both sides of the slot 13 above the feeding point 16. The cut groove 15 and the claw insertion hole 17 are for holding the antenna element 12 at a predetermined position in the antenna cover 11.

  The plate-shaped dipole elements 14a and 14b are each provided with four notches 18 having a predetermined width at the upper and lower center portions. This notch 18 is for accommodating the antenna element 12 in the antenna cover 11 so that it does not come into contact with the constituent members in the antenna cover 11 when the antenna cover 11 is expanded or bent into a flat plate shape. is there.

  The antenna element 12 configured as described above is housed in the antenna cover 11 as shown in FIG. In this case, one plate-shaped dipole element 14 a is accommodated in the first and second covers 21 and 22, and the other plate-shaped dipole element 14 a is accommodated in the third and fourth covers 23 and 24.

  Next, details of the antenna cover 11, the central movable shaft 25, and the side movable shafts 26 and 27 will be described with reference to FIGS.

  FIG. 3A is an exploded perspective view showing essential parts of the antenna element 12, the central movable shaft 25, the second cover 22, and the third cover 23, and FIG. 3B is an antenna at the central movable shaft 25 portion. 3 is a view showing a holding structure of an element 12; FIG. 4 is an exploded perspective view showing a mounting structure of the central movable shaft 25 and the first to fourth covers 21 to 24. FIG. 5 is a cross-sectional view showing the holding structure of the antenna element 12 on the side movable shaft 26 provided between the first cover 21 and the second cover 22.

  The first to fourth covers 21 to 24 constituting the antenna cover 11 are respectively provided with a front cover and a back cover as shown in FIG. That is, the first cover 21 is the front cover 21a and the back cover 21b, the second cover 22 is the front cover 22a and the back covers 22b and 22c, the third cover 23 is the front cover 23a and the back covers 23b and 23c, and the fourth cover. The cover 24 includes a front cover 24a and a back cover 24b.

  Further, the cable holding portion 32 is integrally provided at the outer lower portion of the movable shaft main body 41. In this case, the cable holding part 32 is divided into an upper holding part 32a and a lower holding part 32b, the upper holding part 32a is provided on the movable shaft main body 41 side, and the lower holding part 32b is provided on the lower bearing plate 43. Provided. Details of the cable holding portion 32 will be described later.

  3A and 7, the central movable shaft 25 is provided with a circular upper bearing plate 42 integrally formed on the upper portion of a substantially semi-cylindrical movable shaft main body 41, and below the movable shaft main body 41. A circular lower bearing plate 43 configured separately is mounted on the side. The upper bearing plate 42 is provided with bearings 44a and 44b made of, for example, through holes at predetermined intervals so as to be positioned in the left-right direction of the movable shaft main body 41. The lower bearing plate 43 is provided with bearings 45a and 45b made of, for example, through holes at positions corresponding to the bearings 44a and 44b of the upper bearing plate 42.

  Further, the movable shaft main body 41 is provided with a locking piece 46 protruding from the lower ends of the left and right sides, and a locking groove 47 is provided in the lower bearing plate 43 so as to correspond to the locking piece 46. The lower bearing plate 43 is attached to the lower end portion of the movable shaft main body 41 by inserting the locking piece 46 of the movable shaft main body 41 into the locking groove 47 of the lower bearing plate 43.

  Further, an outer element presser 51 and an inner element presser 52 made of an insulating material such as synthetic resin are provided so as to be positioned inside the central movable shaft 25. As shown in FIG. 3B, the outer element presser 51 and the inner element presser 52 have a substantially U-shaped cross section, and hold the central portion of the antenna element 12 therebetween. The outer element presser 51 is provided with four claws 53 projecting from the inner walls on both sides, and provided with cable insertion holes 54a and 54b close to the lower side. The claw 53 is provided corresponding to the claw insertion hole 17 (see FIG. 2) of the antenna element 12. On the other hand, claw fitting portions 55 are provided on the wall portions on both sides of the inner element presser 52 at positions corresponding to the claws 53 of the outer element presser 51. In addition, substantially semicircular grooves 56 a and 56 b are provided on the inner side surface of the inner element presser 52 at the center of both upper and lower ends.

  Further, on the outer side of the outer element presser 51, a guide member 57 having a predetermined length is provided in the longitudinal direction at a position slightly above the cable insertion holes 54a and 54b in the central portion near the lower side as shown in FIG. It is provided along. On both sides of the guide member 57, a groove 58 is formed in a portion in contact with the outer element presser 51. The side portions of the upper holding portion 32a and the lower holding portion 32b of the cable holding portion 32 are formed along the groove 58. It is inserted and held from both the upper and lower sides.

  When the antenna element 12 is held by the outer element presser 51 and the inner element presser 52, first, the central portion of the antenna element 12 is positioned along the inner side of the outer element presser 51, and the claw 53 provided on the outer element presser 51 is provided. Is inserted through the claw insertion hole 17 of the antenna element 12. Then, the center conductor 31a and the outer conductor 31b of the feeding cable 31 are inserted into the cable insertion holes 54a and 54b from the outside of the outer element presser 51, and are connected to the feeding point 16 of the antenna element 12 by soldering. Next, the inner element presser 52 is positioned inside the outer element presser 51 with the antenna element 12 interposed therebetween, and the claw fitting portion 55 is fitted to the claw 53 to connect the outer element presser 51 and the inner element presser 52. To fix. At this time, the inner element presser 52 is in pressure contact with the central conductor 31a and the outer conductor of the antenna element 12 and the power feeding cable 31 to prevent the antenna element 12 from bending and to prevent the power feeding cable 31 from coming off.

  Thereafter, as shown in FIG. 3A, the movable shaft main body 41 and the lower bearing plate 43 of the central movable shaft 25 are mounted outside the outer element presser 51. That is, the movable shaft main body 41 of the central movable shaft 25 is positioned outside the outer element presser 51, and the side portion of the upper holding portion 32 a of the cable holding portion 32 provided on the movable shaft main body 41 is provided in the outer element presser 51. The guide member 57 is inserted into the groove 58 from above, and the side portion of the lower holding portion 32b of the cable holding portion 32 provided on the lower bearing plate 43 is inserted into the groove 58 of the guide member 57 from below. The upper holding part 32a and the lower holding part 32b of the cable holding part 32 are coupled. At this time, the central movable shaft 25 inserts locking pieces 46 provided on both lower ends of the movable shaft main body 41 into the locking grooves 47 of the lower bearing plate 43, and couples the movable shaft main body 41 and the lower bearing plate 43. To do. At the same time, the power feeding cable 31 is held between the upper holding portion 32a and the lower holding portion 32b of the cable holding portion 32. Details of the holding structure of the power supply cable 31 in the cable holding portion 32 will be described later.

  The central movable shaft 25 is provided with the second cover 22 and the third cover 23 when the movable shaft main body 41 and the lower bearing plate 43 are coupled, and a bearing 44 a provided on the upper bearing plate 42. The second cover 22 and the third cover 23 are pivotally supported by bearings 45 a and 45 b provided on the lower bearing plate 43.

  The front cover 22a of the second cover 22 is formed in a substantially rectangular shape, and side plates 61a and 61b are provided along both the upper and lower sides. The side plates 61 a and 61 b are provided with shaft plates 62 a and 62 b on the side adjacent to the central movable shaft 25, and shaft plates 63 a and 63 b are provided on the side adjacent to the first cover 21. A shaft 64 having a predetermined length is provided on each of the shaft plates 62a and 62b adjacent to the central movable shaft 25 so as to protrude outward, and a predetermined length is provided on the shaft plates 63a and 63b adjacent to the first cover 21. A shaft 65 is provided to project inward. In addition, two claws 66 are provided on the inner side surfaces of the side plates 61a and 61b, respectively, for coupling with the back cover 22b. The front cover 22a is rotated by inserting a shaft 64 provided on the shaft plates 62a and 62b into a bearing 44a provided on the upper bearing plate 42 of the central movable shaft 25 and a bearing 45a provided on the lower bearing plate 43. It is held freely.

  Then, rear covers 22b and 22c are attached to the front cover 22a of the second cover 22 as shown in FIG. The back cover 22c has a smaller width than the back cover 22b, and is detachably coupled to the side of the back cover 22b. The back cover 22b is provided with two claw coupling holes 67 on the outer surfaces on both the upper and lower sides. The claw coupling hole 67 is provided at a position corresponding to the claw 66 on the front cover 22a side, and the back covers 22b and 22c are held with respect to the front cover 22a by being coupled to the claw 66.

  The front cover 23a of the third cover 23 has the same configuration as the front cover 22a of the second cover. That is, the front cover 23a of the third cover 23 is formed in a substantially rectangular shape, and side plates 71a and 71b are provided along both the upper and lower sides. The side plates 71 a and 71 b are provided with shaft plates 72 a and 72 b on the side adjacent to the central movable shaft 25, and shaft plates 73 a and 73 b are provided on the side adjacent to the fourth cover 24. The shaft plates 72a and 72b on the side adjacent to the central movable shaft 25 are each provided with a shaft 74 having a predetermined length projecting outwardly, and the shaft plates 73a and 73b adjacent to the fourth cover 24 have a predetermined length. A shaft 75 is provided so as to protrude inward. In addition, two claws 76 are provided on the inner side surfaces of the side plates 71a and 71b, respectively, for coupling with the back cover 23b. The front cover 23 a is rotated by inserting a shaft 74 provided on the shaft plates 72 a and 72 b into a bearing 44 b provided on the upper bearing plate 42 of the central movable shaft 25 and a bearing 45 b provided on the lower bearing plate 43. It is held freely.

  As described above, the second cover 22 and the third cover 23 are supported by the two central movable shafts 25 and can be arbitrarily rotated. On the other hand, the central movable shaft 25 can rotate within a range of ± 45 ° with respect to the second cover 22 and the third cover 23.

  Then, rear covers 23 b and 23 c are attached to the front cover 23 a of the third cover 23. The back cover 23c has a smaller width than the back cover 23b, and is detachably coupled to the side of the back cover 23b. The back cover 23b is provided with two claw coupling holes 77 on the outer surfaces on both the upper and lower sides. The claw coupling hole 77 is provided at a position corresponding to the claw 76 on the front cover 23a side, and the back covers 23b and 23c are held with respect to the front cover 23a by being coupled to the claw 76.

  Then, as shown in FIG. 4, the first cover 21 is rotatably mounted on a shaft 65 provided on the front cover 22 a of the second cover 22. The front cover 21a and the back cover 21b of the first cover 21 are provided with a pair of semi-cylindrical bearing cylinders 81a and 81b on the side adjacent to the second cover 22, and are substantially aligned along the other side edges. The letter-shaped side plates 82a and 82b are provided. The bearing cylinders 81a and 81b are set so as to be substantially cylindrical when the two are combined, and the inner diameters of the upper and lower ends are set corresponding to the shaft 65 provided on the shaft plates 62a and 62b of the second cover 22. Thus, the shaft 65 can be rotated.

  The bearing cylinders 81a and 81b are configured as shown in FIG. FIG. 5 is a cross-sectional view of the bearing cylinders 81a and 81b. FIG. 5A is a plan view of the first cover 21 and the second cover 22, and FIG. 5B is the first cover 21. FIG. Is shown in a state where it is rotated by 90 ° with respect to the second cover 22.

  As shown in FIG. 5 (a), the first cover 21 has a bearing cylinder 81a formed in substantially the same plane as the front cover 21a, and a locking groove 83 is formed on the front side at the boundary between the front cover 21a and the bearing cylinder 81a. Provided. In addition, a bearing cylinder 81 b is formed on the back cover 21 b of the first cover 21 so as to protrude from the side end to the inside of the first cover 21. When the first cover 21 and the second cover 22 are deployed in a flat shape, the front end of the side of the back cover 21b comes into contact with the side of the back cover 22b of the second cover 22 so as to be held in a flat state. It has become. Further, a predetermined gap is formed between the bearing cylinders 81a and 81b, and the antenna element 12 can be inserted through the gap.

  5B, when the first cover 21 and the second cover 22 are bent 90 ° toward the front side, the locking groove 83 provided in the front cover 21a of the first cover 21 The front cover 22a side portion of the second cover 22 is abutted and locked. At this time, the bearing cylinder 81b provided on the back cover 22b of the first cover 21 is positioned at the bent corner portion to protect the antenna element 12 from being exposed to the outside. In FIG. 5, the side movable shaft 26 provided between the first cover 21 and the second cover 22 has been described. However, the side movable shaft 26 is provided between the third cover 23 and the fourth cover 24. The same applies to the side movable shaft 27.

  Further, as shown in FIG. 4, the front cover 21a of the first cover 21 is provided with two claws 84 at predetermined intervals on the inner side of the upper edge and the lower edge. On the other hand, the back cover 21b of the first cover 21 is provided with a claw coupling hole 85 outside the upper edge and the lower edge. The claw coupling hole 85 is provided at a position corresponding to the claw 84 on the front cover 21a side, and the back cover 21b is coupled to the front cover 21a by coupling with the claw 84.

  The front cover 21a of the first cover 21 is provided with a support member 86 having a predetermined length protruding from the upper and lower outer surfaces of the side plate 82a. Further, a coupling portion 28 is provided on the side plate 82a of the front cover 21a at a position opposite to the bearing cylinders 81a and 81b.

  The fourth cover 24 is configured in the same manner as the first cover 21. That is, the fourth cover 24 is attached to the front cover 23 a of the third cover 23 so that the fourth cover 24 can rotate with respect to the shaft 75. The front cover 24a and the back cover 24b of the fourth cover 24 are provided with semi-cylindrical bearing cylinders 91a and 91b on the side adjacent to the third cover 23, and are substantially U-shaped along the other side edges. Shaped side plates 92a, 92b are provided. The bearing cylinders 91 a and 91 b are set so as to be substantially cylindrical by combining two, and the inner diameters of the upper and lower ends are set corresponding to the shaft 75 provided on the shaft plates 72 a and 72 b of the third cover 23. Thus, the shaft 75 can be rotated. Since the bearing cylinders 91a and 91b have the same configuration as the bearing cylinders 81a and 81b of the first cover 21, a detailed description thereof will be omitted.

  Further, the front cover 24a of the fourth cover 24 is provided with two claws 94 at predetermined intervals inside the upper edge and the lower edge. On the other hand, the back cover 24b of the fourth cover 24 is provided with a claw coupling hole 95 outside the upper edge and the lower edge. The claw coupling hole 95 is provided at a position corresponding to the claw 94 on the front cover 24a side, and the back cover 24b is coupled to the front cover 24a by coupling with the claw 94.

  The front cover 24a is provided with a support member 96 having a predetermined length protruding from the upper and lower outer surfaces of the side plate 92a. Further, a coupling portion 29 is provided on the side plate 92a of the front cover 24a at a position opposite to the bearing cylinders 91a and 91b.

  Next, details of the connecting portion 28 of the first cover 21 and the connecting portion 29 of the fourth cover 24 will be described with reference to FIG.

  FIG. 6 is a cross-sectional view of the coupling portion 28 of the first cover 21 and the coupling portion 29 of the fourth cover 24. In the coupling portion 28 of the first cover 21, coupling concave portions 101 a and 101 b and coupling convex portions 102 a and 102 b are alternately provided. On the other hand, the coupling portion 29 of the fourth cover 24 is provided with coupling convex portions 103 a and 103 b at positions corresponding to the coupling concave portions 101 a and 102 b of the coupling portion 28 of the first cover 21. The coupling recesses 104a and 104b are provided at positions corresponding to the portions 102a and 102b.

  Further, the coupling portion 28 of the first cover 21 is provided with a substantially hemispherical coupling groove 106 at the upper end of the coupling convex portion 102a, and a substantially hemispherical coupling protrusion 107 is provided at the upper end of the coupling convex portion 102a. On the other hand, the coupling portion 29 of the fourth cover 24 is provided with a substantially hemispherical coupling protrusion 108 at the lower end of the coupling convex portion 103a, and a coupling groove 109 at the lower end of the coupling convex portion 103b.

  When the coupling portion 28 of the first cover 21 and the coupling portion 29 of the fourth cover 24 are coupled, the coupling convex portion 103a of the coupling portion 29 is inserted into the coupling groove 106 provided in the coupling convex portion 102a of the coupling portion 28. The coupling projection 108 provided on the coupling portion 28 is inserted, and the coupling projection 107 provided on the coupling projection 102 b of the coupling portion 28 is inserted into the coupling groove 109 provided on the coupling projection 103 b of the coupling portion 29 and coupled. In this case, since the coupling grooves 106 and 109 and the coupling projections 107 and 108 are formed in a substantially hemispherical shape, the first cover 21 and the fourth cover 24 can be arbitrarily arranged in the horizontal direction with the coupling projections 107 and 108 as axes. Can rotate.

  Further, since the first cover 21 and the fourth cover 24 are formed of a synthetic resin or the like having elasticity, the coupling portion 28 and the coupling portion 29 can be easily coupled and separated.

  Next, details of the cable holding portion 32 provided on the central movable shaft 25 will be described with reference to FIG. FIG. 7 shows a detailed configuration of the central movable shaft 25 and the cable holding portion 32, and FIG. 7A is an exploded perspective view showing the movable shaft main body 41 and the lower bearing plate 43 of the central movable shaft 25. b) is an exploded view of the movable shaft main body 41 and the lower bearing plate 43 in FIG. 4A, and is a view of the cable holding portion A, and FIG. 5C is a view of the movable shaft main body 41 and the lower bearing in FIG. It is A arrow directional view of the cable holding part part which shows the state which couple | bonded the board 43. FIG.

  The lower holding portion 32b of the cable holding portion 32 provided on the lower bearing plate 43 includes a cable fixing member 111 and a cable holding member 112. The cable fixing member 111 is located on the edge of the lower bearing plate 43, and the cable holding member 112 is located outside the lower bearing plate 43. The cable fixing member 111 is formed in a substantially U shape, and a cable fixing groove 113 is provided in the upper part. The cable fixing member 111 is formed such that both outer walls with respect to the groove 113 are tapered, that is, the upper side is narrow and the lower side is wide, and the upper end is rounded. Is done.

  The groove 113 is formed such that both inner walls are tapered opposite to the outer wall, that is, the upper opening is wide and the bottom is narrow. On both inner walls of the groove 113, a plurality of, for example, two protrusions 114 for fixing the cable are provided in the vertical direction. The width of the groove 113 is set so that the upper portion is wider than the diameter of the feeding cable 31, the central portion is slightly narrower than the diameter of the feeding cable 31, and the bottom portion is further narrowed at the protrusion 114 portions of both inner walls. That is, the power supply cable 31 is set to be held at a substantially central portion of the groove 113.

  The cable holding member 112 is formed in a substantially semi-cylindrical shape and is integrally provided outside the cable fixing member 111 in a horizontal state. A substantially semicircular groove 115 for holding the cable is provided on the upper surface of the cable holding member 112. The groove 115 is provided at a position corresponding to the substantially central portion of the groove 113 of the cable fixing member 111. The power feeding cable 31 is placed on the groove 115 of the cable holding member 112, and the distal end side thereof is inserted into the groove 113 of the cable fixing member 111.

  On the other hand, the movable shaft main body 41 has a substantially semicircular cross section so as to be positioned along the side edge of the lower bearing plate 43, and is engaged with the locking groove 47 of the lower bearing plate 43 from above the cable fixing member 111. Stopped. The movable shaft main body 41 is provided with a notch 116 at a lower center portion, that is, at a position corresponding to the cable fixing member 111. The notch 116 has an upper portion formed in a substantially semicircular shape, and is provided with substantially semicircular convex portions 117a and 117b for fixing the cable to the semicircular portion. The convex portions 117 a and 117 b are provided at positions where they come into pressure contact with the upper portion of the outer wall of the cable fixing member 111 from the outside when the movable shaft main body 41 is coupled to the lower bearing plate 43.

  Further, the upper holding portion 32a of the cable holding portion 32 is formed in a substantially semi-cylindrical shape and is integrally provided outside the movable shaft main body 41 in a horizontal state. A semicircular groove 118 for holding a cable is provided on the lower surface of the upper holding portion 32a. The groove 118 corresponds to the groove 115 provided in the cable holding member 112 of the lower holding portion 32b.

  When the power supply cable 31 is held by the cable holding portion 32 configured as described above, first, as shown in FIG. 7A, power is supplied onto the groove 115 of the cable holding member 112 provided in the lower holding portion 32b. The cable 31 is placed and the distal end side is positioned in the groove 113 of the cable fixing member 111. In this state, the movable shaft main body 41 is coupled to the lower bearing plate 43. At this time, the feeding cable 31 is held by the grooves 118 and the lower holding portions 32 b of the upper holding portion 32 a of the cable holding portion 32 and the grooves 115 provided in the cable holding member 112, and in the notch 116 of the movable shaft main body 41. The upper portion of the outer wall of the cable fixing member 111 is pressed from the outside by the provided convex portions 117a and 117b and deformed inward, and is fastened and fixed to the groove 113 by the protrusion 114 provided on the inner wall.

  In the portable antenna 10 configured as described above, the antenna cover 11 is divided into four covers 21 to 24 and is rotatably coupled by the central movable shaft 25 and the side movable shafts 26 and 27. As shown in FIG. 1 and FIG. 8, it is possible to change the directivity by changing the shape to a flat shape or a rectangular tube shape, or to change the plane of polarization to receive horizontal polarization or vertical polarization. FIG. 8A is a perspective view of the portable antenna 10 as viewed from below when the portable antenna 10 is developed in a flat shape and in a horizontally polarized wave receiving state, and FIG. 8B is a diagram illustrating the portable antenna 10 formed in a rectangular tube shape. FIG. 4C is a perspective view seen from below when the portable antenna 10 is formed in a rectangular tube shape to obtain a vertically polarized wave reception state. It is.

  As shown in FIGS. 1B and 8A, when the portable antenna 10 is developed in a planar shape and arranged with the lower bearing plate 43 of the central movable shaft 25 on the lower side, horizontal polarization is not generated. It can be received with maximum sensitivity. In this case, the portable antenna 10 is supported by three points of the lower bearing plate 43 of the central movable shaft 25 and the support members 86 and 96 provided on the lower side of the first cover 21 and the fourth cover 24 and is self-supporting. be able to.

  As shown in FIGS. 1C and 8B, when the portable antenna 10 is formed in a rectangular tube shape and arranged with the lower bearing plate 43 of the central movable shaft 25 on the lower side, horizontal polarization Can be received and omnidirectional. Similarly to the case of FIG. 8A, the portable antenna 10 includes three support members 86 and 96 provided below the lower bearing plate 43 of the central movable shaft 25 and the first cover 21 and the fourth cover 24. Being supported and able to stand on the spot.

  When receiving horizontally polarized waves as shown in FIGS. 8 (a) and 8 (b), normal reception can be performed even if they are arranged upside down.

  In FIG. 8C, when the portable antenna 10 is formed in a rectangular tube shape and arranged with the second cover 22 on the lower side, the vertically polarized wave can be received and the antenna can be made omnidirectional. . In this case, since the central movable shaft 25 can be rotated by ± 45 ° with respect to the second cover 22 and the third cover 23, the cable can be arranged even if the second cover 22 is disposed on the lower side. The holding part 32 does not get in the way, and the portable antenna 10 can be kept in a stable state. The portable antenna 10 can receive vertically polarized waves even when the portable cover 10 is arranged with the third cover 23 facing down.

  FIG. 9 shows horizontal polarization horizontal plane directivity (dB scale polar coordinates) at a frequency of 680 MHz when the portable antenna 10 is formed in a planar shape as shown in FIG. Is a figure 8 directivity in the 0 ° and 180 ° directions.

  FIG. 10 shows horizontal polarization horizontal plane directivity (dB scale polar coordinates) at a frequency of 680 MHz when the portable antenna 10 is formed in a rectangular tube shape as shown in FIG. 8B. Although it has directivity, the gain is suppressed in the 90 ° and −90 ° directions.

  According to the first embodiment, since the antenna shape, installation direction, and directivity can be arbitrarily changed, it is possible to set an optimal reception state in accordance with user conditions. Moreover, it does not need to be installed, and can be installed at an arbitrary location to handle both horizontal polarization and vertical polarization, and can be moved to an arbitrary location at any time.

  Furthermore, since the portable antenna 10 according to the above embodiment can be folded, it can be easily carried, can be used as an indoor antenna, and can also function as an external antenna of a mobile device. Further, since the antenna element 12 is not exposed to the outside even when the antenna shape is changed, there is no possibility of causing scratches or breakage due to contact with the outside, and it is excellent in aesthetics. In addition, the antenna can be made independent in any case of horizontal polarization reception and vertical polarization reception without using another component such as a stand.

  In the above embodiment, the case where the portable antenna 10 is developed in a planar shape to obtain a figure eight directivity and the case where the portable antenna 10 is formed in a rectangular tube shape and substantially non-directional is shown. It is also possible to develop the antenna 10 in other shapes to have other directivity.

(Second Embodiment)
Next, a portable antenna according to a second embodiment of the present invention will be described.

  11A and 11B show the configuration of the portable antenna 10 according to the second embodiment of the present invention. FIG. 11A is a top view showing a state in which the portable antenna 10 is developed in a plane, and FIG. It is.

  In the second embodiment, the portable antenna 10 shown in the first embodiment is configured such that the stand-and-use clip 121 can be attached to and detached from the cable holding portion 32 provided on the central movable shaft 25. 121 is configured to be able to stand on the floor using 121 or to be attached to another fixed object. Since the portable antenna 10 has the same configuration as that shown in the first embodiment, the same parts are denoted by the same reference numerals, and detailed description thereof is omitted.

  12A is a perspective view showing only the central movable shaft 25 portion where the cable holding portion 32 is provided, and FIG. 12B is a cross-sectional view of the clip mounting portion of the cable holding portion 32. FIG. 13 is a plan view showing the configuration of the stand-and-use clip 121, and FIG. 14 is an explanatory view when the stand-and-use clip 121 is attached to the clip mounting portion of the cable holding portion 32.

  As shown in FIG. 12, the cable holding portion 32 is provided with clip attachment grooves 122 a and 122 b for attaching the stand and clip 121 on the upper side of the upper holding portion 32 a and the lower side of the lower holding portion 32 b in the horizontal direction. Is configured. The clip mounting grooves 122a and 122b are provided in the vicinity of the tip of the cable holding portion 32, that is, in a portion protruding outward from the lower bearing plate 43 of the central movable shaft 25 so that the stand-and-use clip 121 can be easily attached and detached. Yes.

  The clip mounting portion 123 has a predetermined thickness between the clip mounting grooves 122a and 122b, and is provided with clip fixing holes 124a and 124b on both sides.

  As shown in FIG. 11, the clip serving as a stand 121 includes two clip plates 131 a and 131 b facing each other, and is rotatably supported by a shaft 132 at a substantially central portion. A spring (not shown) is attached to the shaft 132, and an elastic force is applied to the clip plates 131a and 131b so that the holding portion 133 at the tip is closed. Further, as shown in FIG. 13, the clip plates 131a and 131b are formed with a knob portion 134 on the opposite side to the holding portion 133, and a groove 135 having a predetermined length is provided in the longitudinal direction at the center of the tip. The front end side of the knob portion 134 is formed in a straight line and is configured to be able to stand on the floor or the like. The knob portion 134 is formed by bending the clip plates 131a and 131b inward so that it can be easily picked by hand.

  The width of the groove 135 in the knob portion 134 is slightly wider than the thickness between the clip mounting grooves 122a and 122b of the cable holding portion 32. The clip plates 131a and 131b can be inserted into the clip mounting grooves 122a and 122b. The clip plates 131a and 131b are provided with an engagement hole 136 at the tip of the groove 135. The diameter of the engagement hole 136 is set to be slightly larger than the maximum diameter of the clip mounting portion 123 of the cable holding portion 32. In addition, a substantially semicircular engagement protrusion 137 is provided in the engagement hole 136. The engaging projections 137 are provided in a direction orthogonal to the longitudinal direction of the clip plates 131a and 131b, and correspond to the clip fixing holes 124a and 124b provided in the clip mounting portion 123 of the cable holding portion 32.

  When attaching the above-mentioned stand combined clip 121 to the clip attaching portion 123 of the cable holding unit 32, as shown in FIGS. 11A and 11B, the clip plates 131a and 131b constituting the stand combined clip 121 are arranged on the side of the knob portion 134. One is attached to the clip attachment portion 123. For example, the groove 135 formed in the clip plate 131a is inserted from the side into the clip attachment grooves 122a and 122b provided in the clip attachment portion 123 of the cable holding portion 32, and is inserted into the engagement hole 136 as shown in FIG. The clip attachment portion 123 is positioned.

  In this state, as shown in FIG. 14B, the stand-and-use clip 121 is rotated 90 degrees right or left, and the engagement protrusion 137 provided in the engagement hole 136 of the clip plate 131a is fixed to the clip mounting portion 123 by the clip. Engage with one of the holes 124a and 124b and fix. 14B, the stand-and-use clip 121 is rotated 90 ° rightward from the state of FIG. 14A to engage the engaging protrusion 137 with the clip fixing hole 124a, and the knob portion 134 is on the lower side. The state where it is attached is shown. In this way, when the stand-and-use clip 121 is attached to the portable antenna 10 so that the knob portion 134 is on the lower side, the lower end of the knob portion 134 has the same height as the lower bearing plate 43 of the central movable shaft 25. Thus, the dimensions of each part of the stand-and-use clip 121, for example, the position of the engagement hole 136 are set.

  As described above, the groove 135 of the stand combined clip 121 is inserted into the clip attaching portion 123 of the cable holding portion 32 from the side, and the stand combined clip 121 is moved to the right with the clip attaching portion 123 positioned in the engagement hole 136. Alternatively, the clip attachment portion 123 can be attached to the clip attachment portion 123 of the cable holding portion 32 by rotating 90 ° in the left direction.

  FIG. 15 and FIG. 16 are perspective views showing examples of usage patterns when the stand-and-use clip 121 is attached to the portable antenna 10.

  FIG. 15 shows an example in which the stand-and-use clip 121 is attached to the clip attachment portion 123 so that the knob portion 134 is on the lower side in a state where the portable antenna 10 is deployed in a planar shape. When the stand combined clip 121 is attached to the portable antenna 10 so that the knob portion 134 is on the lower side, the lower bearing plate 43 of the central movable shaft 25 and the lower end of the knob portion 134 are at the same height, and the portable antenna 10 can be held in a self-supporting state and can receive horizontal polarization.

  FIG. 16 shows a state in which the portable antenna 10 is deployed in a flat shape so that the clip serving portion 121 is placed on the clip mounting portion 123 so that the knob portion 134 is on the upper side, that is, the holding portion 133 is viewed from the lower side of the portable antenna 10. The example at the time of attaching so that it may protrude and protrude outside is shown. When the stand-use clip 121 is attached to the portable antenna 10 so that the knob portion 134 is on the upper side, the holding portion 133 of the stand-use clip 121 is attached to a fixed object 141 such as a rod-like body or a plate-like band. be able to.

  When the portable antenna 10 is used for horizontally polarized wave reception, as shown in FIG. 16, the portable antenna 10 is attached to the upper side of the fixed object 141 with a stand and clip 121 as shown in FIG. In this state, the portable antenna 10 is held in the horizontal direction and can receive horizontal polarization.

  Further, the portable antenna 10 is rotated 180 ° from the state shown in FIG. 16 and turned upside down, and the stand-and-use clip 121 is positioned on the upper side. Can be used by mounting on the lower side.

  Further, when the portable antenna 10 is rotated by 90 ° from the state shown in FIG. 16 and the stand-and-use clip 121 is positioned to the side, the stand-and-use clip 121 is attached to the side of the fixed object 141 and used. can do. In this case, since the portable antenna 10 is positioned in the vertical direction, it can receive vertically polarized waves.

  FIG. 17 shows that the stand-and-use clip 121 is attached to the portable antenna 10 deployed in a planar shape so that the longitudinal directions thereof coincide with each other, and the portable antenna 10 is positioned in the vertical direction and attached to the fixed object 141 from above. An example of the case is shown. In this case, the engagement protrusion 137 provided in the engagement hole 136 of the stand-and-use clip 121 is not engaged with the clip fixing holes 124a and 124b provided in the clip attachment portion 123 of the cable holding portion 32. Since the weight of the antenna 10 is applied to the lower portion of the engagement hole 136, the portable antenna 10 can be stably held by the stand-and-use clip 121. In the installed state of FIG. 17, the portable antenna 10 can receive vertically polarized waves.

  According to the second embodiment, since the stand-and-use clip 121 can be attached to the portable antenna 10, the portable antenna 10 is held in a very stable state by the stand function when installed on the floor surface. can do.

  Further, by using the clip 121 serving as a stand, not only on the floor surface, but also in any place using a structure in the house, for example, a flat object such as a monitor or a rack, further a curtain rail or a handrail It can be attached to various places such as a rod-shaped object such as, and the degree of freedom of the place where the antenna can be installed can be increased. For this reason, there is no restriction on the installation location, and it is possible to easily cope with horizontal polarization and vertical polarization. Further, the stand-and-use clip 121 can be manufactured at low cost by sharing the self-standing function and the antenna mounting function.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements without departing from the scope of the invention in the implementation stage.

The example of a structure of the portable antenna which concerns on 1st Embodiment of this invention is shown, The example of a structure of the portable antenna which concerns on 1st Embodiment of this invention is shown, (a) is folded into two and is stored (B) is a perspective view showing a form when it is expanded in a flat shape to be in a maximum receiving state, and (c) is a state in which it is bent into a rectangular tube shape to be in an omnidirectional receiving state. It is a perspective view which shows the form. In the same embodiment, it is a front view which expands and shows the antenna element accommodated in an antenna cover in planar shape. (A) is an exploded perspective view showing the main part of the antenna element, the central movable shaft, the second cover and the third cover in the same embodiment, (b) is a holding structure of the antenna element in the central movable shaft portion. FIG. It is a disassembled perspective view which shows the attachment structure of the center movable shaft and the 1st thru | or 4th cover in the same embodiment. In the same embodiment, it is sectional drawing which shows the holding structure of the antenna element in a side part movable shaft part. It is sectional drawing which shows the structure of the coupling | bond part provided in the 1st cover and 4th cover in the embodiment. It is a figure which shows the detailed structural example of the center movable axis | shaft and the cable holding part in the embodiment. It is a perspective view which shows the example of a receiving form of the portable antenna which concerns on the same embodiment. It is a figure which shows the horizontal polarization horizontal plane directivity in the frequency of 680 MHz at the time of expand | deploying the portable antenna which concerns on the same embodiment planarly. It is a figure which shows the horizontal polarization horizontal plane directivity in the frequency of 680 MHz at the time of making the portable antenna which concerns on the same embodiment into a rectangular tube shape. The structure of the portable antenna which concerns on 2nd Embodiment of this invention is shown, (a) is a top view which shows the state expand | deployed planarly, (b) is the same rear view. (A) is a perspective view which shows the center movable axis | shaft part in which the cable holding part in the same embodiment was provided, (b) is sectional drawing of the clip attachment part of a cable holding part. It is a top view which shows the structure of the clip combined with the stand in the embodiment. In the embodiment, it is explanatory drawing in the case of attaching a clip serving as a stand to a clip attaching part of a cable holding part. It is a perspective view which shows the example of a form in the case of attaching the clip combined with a stand to the portable antenna in the same embodiment, and making it self-support. It is a perspective view which shows the example of a form in the case of attaching a stand combined clip to the portable antenna in the same embodiment, and attaching to a fixed target object. It is a perspective view which shows the other example of a form in the case of attaching a stand combined clip to the portable antenna in the same embodiment, and attaching to a fixed target object. It is a perspective view which shows the structural example in the case of attaching the conventional terrestrial digital broadcast receiving antenna using a plate-shaped dipole element to a mast, and performing horizontal polarization reception. It is a perspective view which shows the structural example in the case of attaching the conventional antenna for terrestrial digital broadcasting using a plate-shaped dipole element to a mast, and performing vertical polarization reception. It is a perspective view which shows the structural example in the case of mounting | wearing with the stand for the conventional terrestrial digital broadcasting receiving antenna using a plate-shaped dipole element.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Portable antenna, 11 ... Antenna cover, 12 ... Antenna element, 13 ... Slot, 14a, 14b ... Plate-shaped dipole element, 15 ... Cut groove, 16 ... Feeding point, 17 ... Nail insertion hole, 18 ... Notch, 21-24 ... 1st-4th cover, 21a ... Front cover of 1st cover, 21b ... Back cover of 1st cover, 22a ... Front cover of 2nd cover, 22b, 22c ... 2nd cover 23a ... the front cover of the third cover, 23b, 23c ... the back cover of the third cover, 24a ... the front cover of the fourth cover, 24b ... the back cover of the fourth cover, 25 ... centrally movable Axis 26, 27: Side movable shaft, 28, 29: Coupling portion, 31: Feeding cable, 32: Cable holding portion, 32a: Upper holding portion, 32b: Lower holding portion, 41 ... Movable shaft main body, 42 ... Upper portion axis Plate, 43 ... Lower bearing plate, 44a, 44b ... Bearing of upper bearing plate, 45a, 45b ... Bearing of lower bearing plate, 46 ... Locking piece, 47 ... Locking groove, 51 ... Outer element presser, 52 ... Inner element Presser, 53 ... claw, 54a, 54b ... cable insertion hole, 55 ... claw fitting part, 56a, 56b ... semicircular groove, 57 ... guide member, 58 ... groove, 61a, 61b ... side plate, 62a, 62b, 63a, 63b ... shaft plate, 64, 65 ... shaft, 66 ... claw, 67 ... claw coupling hole, 71a, 71b ... side plate, 72a, 72b, 73a, 73b ... shaft plate, 74, 75 ... shaft, 76 ... claw, 77 ... Claw coupling hole, 81a, 81b ... Bearing cylinder, 82a, 82b ... Side plate, 83 ... Locking groove, 84 ... Claw, 85 ... Claw coupling hole, 86 ... Support member, 91a, 91b ... Bearing cylinder, 92a, 92b ... side plate, 93 ... locking groove, 94 ... claw, 95 ... claw coupling hole, 6 ... Support member, 101a, 101b ... Coupling recess, 102a, 102b ... Coupling projection, 103a, 103b ... Coupling projection, 104a, 104b ... Coupling recess, 106, 109 ... Coupling groove, 107, 108 ... Coupling projection, 111 DESCRIPTION OF SYMBOLS ... Cable fixing member, 112 ... Cable holding member, 113 ... Groove, 114 ... Cable fixing protrusion, 115 ... Cable holding groove, 116 ... Notch, 117a, 117b ... Projection, 118 ... Groove, 121 ... Clip for stand use, 122a, 122b ... Clip mounting groove, 123 ... Clip mounting portion, 124a, 124b ... Clip fixing hole, 131a, 131b ... Clip plate, 132 ... Shaft, 133 ... Holding portion, 134 ... Knob portion, 135 ... Groove DESCRIPTION OF SYMBOLS 136 ... Engagement hole, 137 ... Engagement protrusion, 141 ... Fixed object.

Claims (4)

  The substantially rectangular first to fourth antenna covers that are sequentially connected, the two central movable shafts that pivotally support the second and third antenna covers located on the center side, and the first A connecting portion between the antenna cover and the second antenna cover, a movable shaft portion formed at each of the connecting portions between the third antenna cover and the fourth antenna cover, and in the first to fourth antenna covers. And a flat antenna element having flexibility, and the first to fourth antenna covers can be deformed by being rotated by the central movable shaft and the movable shaft portion. Portable antenna.   The portable antenna according to claim 1, wherein the central movable shaft is integrally provided with a cable holding portion for holding a feeding cable on an outer side portion.   The movable shaft portion provided at the connecting portion between the first and second antenna covers and between the third and fourth antenna covers is composed of a pair of bearing cylinders having a gap through which the antenna element is inserted, and has an antenna shape. 2. The portable antenna according to claim 1, wherein the antenna element is held so as not to be exposed to the outside even when the distance is changed.   The portable antenna according to claim 2, wherein the cable holding portion provided on the central movable shaft includes a clip attaching portion to which a clip for attaching the antenna to a fixed object is detachable.

Images