JP2007165965A - Antenna - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an antenna to be used for mobile communication such as a cellular phone, in which an antenna element are arranged without rise of the element on a curved surface including an end. <P>SOLUTION: A front side surface 22 used as an element mounting surface formed of a curved shape of a base 21 holds the center of a linear portion 45 of an antenna element 31 formed with a curved shape having a steeper curve than the shape along the front side surface 22, so that the center is close to the element mounting portion. Thus, the antenna can be realized having a configuration capable of preventing rise from the element mounting surface including the end portion of the antenna element 31. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an antenna mounted on mobile communication such as a mobile phone.

  In recent years, mobile communications including cellular phones have diversified services for voice communications, data communications such as text and moving images, and high performance wireless devices are required. In particular, the performance of an antenna serving as an entrance through which radio waves are transmitted and received is one of the major factors affecting the performance of a wireless device, and a high-performance antenna is desired.

  In addition, wireless devices have been rapidly reduced in size and thickness, and studies have been made on a device that has a small volume and can share an antenna mounting portion with other functional portions.

  Here, a conventional antenna will be described with reference to the drawings.

  FIG. 3 is a perspective view of a conventional antenna, and FIG. 4 is a cross-sectional view schematically showing the mounting state of the antenna. As shown in the figure, the conventional antenna is an antenna made of a metal plate formed in a rectangular shape. The antenna element 1 is composed of an element 1 and a base portion 2 made of an insulating resin having an outer shape formed in a substantially rectangular parallelepiped shape. The antenna element 1 is fixed on a flat upper surface portion of the base portion 2.

  The antenna element 1 is provided with a U-shaped slit 1B at a substantially central position of a rectangular upper plate portion 1A. On the other hand, the base 2 is provided with a notch 2B on the upper surface according to the position of the slit 1B, and a portion below the upper surface is formed as a hollow portion 2A. In addition, although illustration of the upper side housing | casing of the apparatus which covers upper direction including on the antenna is abbreviate | omitted, it becomes the structure by which the upper side housing | casing part according to this antenna mounting position becomes a receiving part. In addition, the conventional antenna is arranged and mounted on the printed wiring board 4 as shown in the figure, and a power feeding unit integrally formed with the upper plate portion 1A in the mounted state is provided in the device casing. It is connected to a wireless circuit (not shown).

  A speaker 6 is mounted in a mounting hole provided in the printed wiring board 4 so as to be housed in the hollow portion 2A of the base 2 of the conventional antenna.

  The wireless device configured as described above is used by transmitting and receiving radio waves via the antenna. For example, sound from the speaker 6 during a call is transmitted from the hollow portion 2A of the base 2 and the antenna element 1. It was transmitted from the receiver of the upper housing via the slit 1B.

As prior art document information related to the invention of this application, for example, Patent Document 1 is known.
JP 2003-204594 A

  In recent years, with the progress of miniaturization and thinning of wireless devices, it is preferable that the outer shape of the wireless device is connected with a smooth curve. In order to realize the state, the position of the upper end portion of the housing is often set, and the outer shape of the antenna is often designated by a shape other than a substantially rectangular parallelepiped shape having a curved surface portion.

  However, in the conventional antenna configured by arranging the upper plate portion 1A of the antenna element 1 on the upper surface portion of the base portion 2, for example, the upper surface portion of the base portion 2 does not have the corner portion of the front upper surface portion thereof. When a curved surface gradually narrowing toward the front is specified, if the upper plate portion 1A is arranged on the curved portion, the end portion is easy to float from the element mounting surface, and a finger or the like is caught there, and the antenna element 1 is deformed. Since it also becomes a factor that occurs, it was often arranged excluding the curved portion.

  The present invention solves such a conventional problem, and the antenna element is arranged including a portion of the element mounting surface formed in a curved surface, and further including the end of the antenna element in that portion. An object of the present invention is to provide an antenna that is prevented from floating from the element mounting surface.

  In order to achieve the above object, the present invention has the following configuration.

  According to the first aspect of the present invention, a surface serving as an element mounting surface is fixed to the base portion made of a resin having a gently curved shape whose center bulges outward and the element mounting surface. The antenna element has a holding means in the vicinity of the center thereof, and is formed in a curved shape that is stronger in bending than the shape along the element mounting surface of the base. The antenna element is mounted so that the central portion of the antenna element is held close to the element mounting surface by means to prevent the end of the antenna element from floating from the element mounting surface.

  With this configuration, when the antenna element is mounted on a curved surface, the antenna element including the end of the antenna element disposed in that portion can be prevented from being lifted from the base. Have

  According to a second aspect of the present invention, in the first aspect of the invention, the base portion is an element mounting surface formed with a gently curved shape with one side surface bulging outward, and the element mounting surface Corresponding to the antenna element is formed by a narrow linear portion, and the linear portion has a holding means at a position near the center in the longitudinal direction and has a stronger bending than the shape along the element mounting surface of the base portion. It is formed in a curved surface shape, and the central portion of the linear portion is held in proximity to the element mounting surface by the holding means, thereby preventing the end of the antenna element from floating from the element mounting surface. And has an effect that the antenna element can be realized without being floated on the side surface portion of the base portion.

  According to a third aspect of the present invention, in the second aspect of the present invention, the base includes a wall portion that forms a through hole penetrating in the upper and lower thickness directions in a region where no antenna element is disposed, and the through hole Is made to function as a sound collection unit for the sound from the sound source arranged corresponding to the lower position of the through hole of the base, and an additional function can be obtained by effectively utilizing the position of the base where the antenna element is not arranged. It has the effect of being able to make it equipped.

  As described above, according to the present invention, even when an antenna element is mounted on a curved surface, it is possible to realize an antenna that is prevented from floating from the base including the end of the antenna element. Effects can be obtained.

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

(Embodiment)
FIG. 1 is a perspective view of an antenna according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. In the following description, the directions indicated by the arrows in the figure are defined as front, rear, left and right.

  In the figure, reference numeral 21 denotes a resin base formed with a predetermined thickness, and the front side surface portion 22 has a curved shape in which the center bulges to the front side (outward side) when viewed from above. The shape is specified by the manufacturer. The bulging state is specified to protrude forward with a gentle bend without corners or the like. Moreover, the shape which suppresses the corner | angular part of the front upper surface side is also designated, and the said front side surface part 22 is designated as the shape which can take only short thickness as a flat surface from the thickness of the base part 21. FIG. In addition, this front side part 22 is a surface used as the element mounting surface formed in the gently curved shape described in the claims.

  A depression 23 having an upper opening is provided at the center upper surface position of the front side face 22, and an engagement protrusion 24 that protrudes upward and is provided integrally with the base 21 is provided in the depression. ing.

  Reference numeral 31 denotes an antenna element made of a metal plate attached to the base 21. The shape of the antenna element is a U-shaped portion 41 having an opening on the left side and a left end position at the rear end position of the U-shaped portion 41. It is mainly comprised from the receiving part 42 extended in the relationship orthogonal to, and the linear part 45 extended to the front side from the surface which hits the bottom part of the U-shaped part 41. As shown in FIG. The linear portion 45 is a portion disposed so as to overlap the front side surface portion 22 on the plate thickness side, and the portion corresponding to the center position of the front side surface portion 22 is parallel to the upper and lower surfaces of the base portion 21. And a protruding piece 48 bent to extend rearward is provided. The projecting piece 48 serves as a holding means, and includes a holding hole 47 penetrating vertically.

  In addition, the shape of the linear portion 45 before incorporation is previously bent and formed into a curved shape in a top view that is stronger than the shape along the front side surface portion 22.

  The antenna element 31 is arranged such that the right side portion of the base portion 21 is sandwiched in the U-shaped portion 41 while the rear side surface portion of the base portion 21 is received by the receiving portion 42, and in the linear portion 45. The engaging protrusion 24 provided on the front side surface portion 22 is inserted and held in the holding hole 47 of the protrusion 48 so that the central portion of the front side surface portion 22 and the central portion of the linear portion 45 are in close contact with each other. Are placed in close proximity.

  At this time, the front side surface portion 22 and the linear portion 45 have different curved surfaces as described above, and the linear portion 45 is strongly bent, so that the central position of the linear portion 45 on the front side surface portion 22 is increased. Are disposed close to each other, including the longitudinal end of the linear portion 45 and the root portion connected to the U-shaped portion 41, the linear portion 45 naturally approaches the front side surface portion 22 over the entire length. Arranged.

  Then, the opposing plate-like portion and the linear portion 45 of the U-shaped portion 41 and the like are crushed and caulked at the tips of the caulking protrusion 25 and the engaging protrusion 24 provided on the base portion 21, so that the entire portion becomes the base portion 21. It is fixed.

  As described above, the antenna according to this embodiment has the antenna element 31 arranged on the side surface of the base 21. For this reason, it is configured that a relatively large space is provided on the upper and lower surfaces of the base portion 21 where the antenna element is normally disposed, and an additional function can be configured using the empty space.

  For example, in the antenna, a through hole 27 formed by being surrounded by a wall portion 27A is provided on the upper and lower surfaces of the base portion 21 serving as the empty space. The position of the through hole 27 is set so that when the antenna is mounted on a device to be used, a speaker (not shown) mounted on the device is located below the position of the through hole 27. . If it is incorporated in the device with the above settings, the sound from the speaker as the sound source is reliably collected through the wall portion 27A that forms the through hole 27, and clear sound is generated from the upper surface side of the base portion 21. It can be realized to communicate.

  Note that if the wall 27A of the through hole 27 is set to have a diameter that increases toward the upper surface side, the sound diffusion state and the like are preferably improved.

  As described above, the antenna can be realized as the antenna element 31 mounted without being floated on a curved surface including the end portion. When the antenna element 31 is in the mounted state, the antenna element 31 can be prevented from being deformed by hooking a finger or the like on the end of the antenna element 31 when handling the antenna, and the base 21 has many curved surface settings. The side surface portion can also be used as an element mounting surface. And what makes a side surface part an element mounting surface can also be provided with an additional function by utilizing effectively the upper-lower surface position of the base 21 in which the antenna element 31 is not arrange | positioned.

  Further, when the antenna element 31 is mounted on the base 21 without floating, an effect that the characteristics of the antenna are stable with no variation can be obtained.

  The antenna is used by being mounted on a mobile communication radio device such as a mobile phone, and its operation is to transmit and receive radio waves via an antenna element 31 connected to a radio circuit of the device. Since it is general, detailed description is omitted.

  Here, a method for fixing the antenna element 31 to the base 21 will be briefly described.

  First, the U-shaped portion 41 of the antenna element 31 is fitted to the right side portion of the base portion 21 while the rear side surface portion of the base portion 21 is received by the receiving portion 42, and the linear portion 45 is formed on the front side surface portion 22 serving as an element mounting surface. Position. At this time, the linear portion 45, which is more bent than the front side surface portion 22, has its tip portion in contact with the front side surface portion 22, the central portion and the like are floating, and the whole is close to the element mounting surface. It is not.

  Then, while holding the linear portion 45 slightly twisted in this state, the holding hole portion 47 of the protruding piece portion 48 arranged at the center position is fitted and held in the engaging protruding portion 24 provided on the front side surface portion 22. Let At this time, as long as the receiving portion 42 receives the rear side surface portion of the base portion 21, even in the process including the torsion described above, the holding portion 42 can only hold the base portion 21 with the U-shaped portion 41. It is preferable that the antenna element 31 in the temporarily fixed state is not inadvertently detached from the base portion 21.

  And by the above fitting, the central position of the linear portion 45 is brought into close proximity with the front side surface portion 22, and accordingly, the linear portion 45 stronger than the front side surface portion 22 has a gently curved shape. The caulking hole provided on the front end side of the linear part 45 from the holding hole 47 fits smoothly into the corresponding caulking protrusion 25. In particular, the distal end portion of the linear portion 45 in the longitudinal direction and the root portion connected to the U-shaped portion 41 come into close contact with the element mounting surface due to the difference in the degree of bending.

  Finally, the caulking protrusions 25 and the engaging protrusions 24 of the base 21 are crushed and caulked to secure the caulking and fixing of the opposing plate-like portions and the linear portions 45 of the U-shaped portion 41 to complete the antenna. Let

  As described above, the antenna can be configured such that the linear portion 45 of the antenna element 31 is arranged without floating on the front side surface portion 22 formed in a curved shape by a simple process, which is advantageous in terms of manufacturing cost. .

  In the above description, the side surface portion of the base portion 21 is the element mounting surface. However, other surfaces such as the upper surface may be used as the element mounting surface. Even in that case, the center position of the element mounting surface is formed into a curved shape that bulges outward, and the corresponding antenna element is formed into a curved shape that is stronger in bending than the shape along the surface, Similarly, the antenna element was mounted in a state where the end of the antenna element was prevented from floating on the element mounting surface of the base portion by holding the central portion of the antenna element close to the center position of the element mounting surface. Can be configured.

  The present invention is not limited to the number of antenna elements mounted on the base in the above concept, and is not limited to the type of antenna. Further, the antenna element holding means and the like are not limited to the configuration described above, and may be of other configurations.

  The antenna according to the present invention has an effect that the antenna element can be realized with a configuration in which the antenna element is arranged on the curved surface including the end portion without floating, and is useful for mobile communication such as a mobile phone.

1 is a perspective view of an antenna according to an embodiment of the present invention. Exploded perspective view A perspective view of a conventional antenna Sectional view schematically showing the mounting state of the antenna

Explanation of symbols

21 Base portion 22 Front side surface portion 23 Indentation portion 24 Engaging projection portion 25 Caulking projection 27 Through hole 27A Wall portion 31 Antenna element 41 U-shaped portion 42 Receiving portion 45 Linear portion 47 Holding hole portion 48 Protruding piece portion (holding) means)

Claims (3)

The surface as the element mounting surface is composed of a resin base formed in a gently curved shape with the center bulging outward, and a metal plate antenna element fixed to the element mounting surface. The antenna element has a holding means in the vicinity of the center thereof and is formed in a curved shape that is stronger in bending than the shape along the element mounting surface of the base, and the central portion of the antenna element is mounted on the element by the holding means. An antenna mounted so as to prevent the end of the antenna element from floating from the element mounting surface by being held in proximity to the surface. The base part is an element mounting surface formed with a gently curved surface with one side surface bulging outward, and a portion of the antenna element corresponding to the element mounting surface is formed with a narrow linear portion. The linear portion has a holding means at a position in the vicinity of the center in the longitudinal direction and is formed in a curved shape that is stronger in bending than the shape along the element mounting surface of the base portion. The antenna according to claim 1, wherein the antenna is mounted such that the central portion is held in proximity to the element mounting surface to prevent the end of the antenna element from floating from the element mounting surface. The base includes a wall portion that forms a through-hole penetrating in the upper and lower thickness directions in a region where the antenna element is not disposed, and the sound source is arranged so that the through-hole corresponds to a position below the through-hole position of the base portion. The antenna according to claim 2, wherein the antenna functions as a sound collecting unit for sound from the sound.

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