JP2013042376A - Portable device built-in antenna structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable device built-in antenna structure which reduces the thickness of an antenna structure and thereby dealing with the thickness reduction of a portable device in the portable device having a metal housing.SOLUTION: A portable device built-in antenna structure 1 conducts wireless communication through magnetic flux and includes: a metal housing of a portable device where a groove 3 recessed in the thickness direction is formed at a specific portion; and a conductive member 5 disposed in the groove 3 of the housing 2. The conductive member 5 includes a conductive part 6 and an insulation part 7 insulating the conductive part 6 from the housing 2.

Description

  The present invention relates to an antenna structure built in a portable device that performs wireless communication through a magnetic flux such as a mobile phone or a PHS.

As this type of conventional portable device built-in antenna structure, for example, the one described in Patent Document 1 is known.
The antenna structure with a built-in portable device described in Patent Document 1 has a built-in antenna coil in a casing or a battery unit cover of a portable device that performs wireless communication. The housing and the battery unit cover are made of resin.

As another conventional antenna structure with a built-in portable device, for example, one described in Patent Document 2 is known. FIG. 9 is a cross-sectional view showing a configuration of a conventional portable device built-in antenna structure described in Patent Document 2. In FIG.
A portable device built-in antenna structure 101 illustrated in FIG. 9 includes an RFID antenna device 104 including a thin and loop-shaped RFID antenna 102 and a magnetic sheet 103 covering one surface of the RFID antenna 102. The RFID antenna device 104 is mounted on the inner surface of the rear cover 105 that constitutes the casing of the portable device. In FIG. 9, reference numeral 106 denotes a printed circuit board.
When using the RFID system, the RFID antenna 102 is brought close to a looped RW antenna (not shown) provided in the reader / writer device (not shown) to perform wireless communication with the reader / writer device.

JP 2003-37861 A JP 2009-182902 A

However, the portable device built-in antenna structures described in Patent Document 1 and Patent Document 2 have the following problems.
That is, in the portable device built-in antenna structure described in Patent Document 1, the housing and the battery unit cover in which the antenna is built are made of resin. In recent years, the casings of portable devices are often made of metal, and the technique described in Patent Document 1 can be applied as it is when the antenna is built in the metal casing of the portable device. Can not.

In the portable device built-in antenna structure 101 described in Patent Document 2, the RFID antenna device 104 is mounted on the inner surface of the rear cover 105 constituting the casing of the portable device. For this reason, the combined thickness of the RFID antenna device 104 and the rear cover 105 becomes large, and there is a problem that it is not possible to cope with the reduction in thickness of the portable device.
Accordingly, the present invention has been made to solve the above-described problems, and its object is to reduce the thickness of the antenna structure by reducing the thickness of the antenna structure in a portable device having a metal housing. An object of the present invention is to provide a portable device built-in antenna structure.

  In order to achieve the above object, a portable device built-in antenna structure according to claim 1 of the present invention is a portable device built-in antenna structure that performs wireless communication through magnetic flux, and a groove recessed in a thickness direction is formed in a specific portion. A metal mobile device housing and a conductive member disposed in the groove of the housing, the conductive member insulating the conductive portion and the conductive portion from the housing It is characterized by comprising a part.

A portable device built-in antenna structure according to claim 2 of the present invention is the portable device built-in antenna structure according to claim 1, wherein the first through-hole penetrates in a part of the groove of the housing in the thickness direction. It is characterized by providing holes.
A portable device built-in antenna structure according to a third aspect of the present invention is the portable device built-in antenna structure according to the first or second aspect, wherein a magnetic field is formed between the conductive member and the bottom of the groove in the groove. It is characterized by the arrangement of the body.

Further, the portable device built-in antenna structure according to claim 4 of the present invention is characterized in that, in the portable device built-in antenna structure according to claim 3, the magnetic body is in a sheet form.
Moreover, the portable device built-in antenna structure according to claim 5 of the present invention is the portable device built-in antenna structure according to any one of claims 1 to 4, wherein the antenna has a structure near the groove. A second through hole penetrating in the thickness direction is provided.
Moreover, the portable device built-in antenna structure according to claim 6 of the present invention is the portable device built-in antenna structure according to claim 5, wherein a plurality of the second through holes are provided and arranged in a lattice pattern. It is said.

Moreover, the portable device built-in antenna structure according to claim 7 of the present invention is the portable device built-in antenna structure according to any one of claims 1 to 6, wherein the conductive member serves as the conductive portion. It consists of the coil which punched the metal plate, and the insulator which insert-molded the said coil as the said insulation part.
In addition, an antenna structure with a built-in portable device according to an eighth aspect of the present invention is the antenna structure with a built-in portable device according to any one of the first to sixth aspects, wherein the conductive member is a flexible circuit board, or It is characterized in that a conductor is printed on an insulator.

According to the antenna structure with a built-in portable device according to the present invention, a metal portable device casing in which a groove recessed in a thickness direction is formed in a specific portion, and a conductive member disposed in the groove of the casing. The conductive member includes a conductive portion and an insulating portion that insulates the conductive portion from the housing. For this reason, since a conductive member fits in the groove | channel of a housing | casing, the thickness which match | combined the housing | casing and the conductive member becomes thin, and the thickness of an antenna structure can be made thin in the portable apparatus which has a metal housing | casing. Accordingly, it is possible to cope with the thinning of the portable device.
Moreover, when the 1st through-hole penetrated in the thickness direction is provided in a part of groove | channel of a housing | casing, the magnetic flux passes the 1st through-hole in the case of communication, and the permeability | transmittance can be improved.

It is the perspective view which looked at 1st Embodiment of the antenna structure with a built-in portable device concerning the present invention from the surface side. However, in FIG. 1, the insulating portion and the magnetic body are omitted. It is the perspective view which looked at the antenna structure with a built-in portable device shown in FIG. 1 from the back side. However, in FIG. 2, the insulating portion and the magnetic body are omitted. It is a top view of the antenna structure with a built-in portable device shown in FIG. However, in FIG. 1, the insulating portion and the magnetic body are omitted. It is sectional drawing which follows the 4-4 line in FIG. It is an enlarged view of the part shown by the arrow 5 in FIG. FIG. 6 is a cross-sectional view taken along line 6-6 in FIG. It is an enlarged view of the part shown by the arrow 7 in FIG. It is the perspective view which looked at 2nd Embodiment of the portable device built-in antenna structure which concerns on this invention from the surface side. However, in FIG. 8, the insulating portion and the magnetic body are omitted. It is sectional drawing which shows the structure of the conventional portable apparatus built-in antenna structure described in patent document 2. FIG.

Embodiments of a connector manufacturing method according to the present invention will be described below with reference to the drawings.
The portable device built-in antenna structure 1 shown in FIGS. 1 to 3 is used for a portable device that performs wireless communication through magnetic flux. Examples of the mobile device include a mobile phone and a PHS.
The mobile device built-in antenna structure 1 includes a metal housing 2 of the mobile device and a conductive member 5.

  The housing | casing 2 comprises the rear cover of a portable apparatus, and is manufactured with a metal material. The housing 2 is manufactured by die casting, for example. The casing 2 includes a flat plate portion 2a extending in the longitudinal direction and a width direction orthogonal to the longitudinal direction, a pair of end wall portions 2b falling from both longitudinal ends of the flat plate portion 2a, and both sides of the flat plate portion 2a in the width direction. And a pair of side wall portions 2c that fall. The end wall portion 2b and the side wall portion 2c are continuously connected.

The flat plate portion 2a of the housing 2 is formed with a groove 3 having a rectangular loop shape when viewed from the plane. The groove 3 is recessed in the thickness direction of the flat plate portion 2 from the surface of the flat plate portion 2a. As shown in FIGS. 4 and 5, the amount of recess in the groove 3 is a little over 1/2 of the thickness of the flat plate portion 2 a, and the conductive member 5 described later is projected after being disposed in the groove 3. It is not to the extent.
A plurality of first through holes 4 penetrating in the thickness direction of the flat plate portion 2a are formed in a part of the groove 3 of the flat plate portion 2a. Specifically, as shown in FIGS. 1 and 3, three first through holes 4 are formed at a predetermined pitch in each of the opposing long side portions of the groove 3. As shown in FIG. 3, each first through-hole 4 has a rectangular shape as viewed from above, and the width in the direction crossing the groove 3 is slightly larger than the width of the groove 3.

  And the electrically-conductive member 5 is arrange | positioned in the groove | channel 3 of the housing | casing 2, as shown in FIG.1 and FIG.3. As shown in FIGS. 4 to 7, the conductive member 5 includes a conductive portion 6 and an insulating portion 7 that insulates the conductive portion 6 from the housing 2. The conductive portion 6 is formed of a coil obtained by punching a metal plate, and is wound three times in the groove 3. The insulating portion 7 is formed of an insulator in which a coil as the conductive portion 6 is insert-molded. As shown in FIG. 4, the insulating portion 7 has a rectangular cross section that fills the inside of the groove 3.

Further, as shown in FIGS. 4 to 7, a magnetic body 8 is disposed between the conductive member 5 and the bottom of the groove 3 in the groove 3. The magnetic body 8 is a soft magnetic material formed in a sheet shape and mixed with a soft magnetic powder in a resin layer. As shown in FIG. 5, the total thickness of the magnetic body 8 and the thickness of the insulating portion 7 is equal to or slightly smaller than the depth of the groove 3.
When manufacturing the portable device built-in antenna structure 1, first, the groove 3 is formed in the flat plate portion 2 a of the housing 2. The groove 3 is formed at the time of die casting of the housing 2 or is formed by machining using an end mill after die casting of the housing 2.

Next, a plurality of first through holes 4 are formed in a part of the groove 3. The first through hole 4 is formed when the casing 2 is die-cast, or is formed by machining such as punching after the casing 2 is die-cast.
Then, a sheet-like magnetic body 8 is laid on the bottom of the groove 3. After that, the conductive member 5 formed by insert-molding the coil as the conductive portion 6 with the insulator as the insulating portion 7 is placed on the magnetic body 8. Thereby, the portable device built-in antenna structure 1 is manufactured.

  Here, in the portable device built-in antenna structure 1 in the present embodiment, a groove 3 that is recessed in the thickness direction is formed in a specific portion of the metal housing 2. A conductive member 5 including a conductive portion 6 and an insulating portion 7 that insulates the conductive portion 6 from the housing 2 is disposed in the groove 3. For this reason, since the conductive member 5 fits in the groove 3 of the housing 2, the combined thickness of the housing 2 and the conductive member 5 is reduced, and in the portable device having the metal housing 2, the antenna structure 1 The thickness can be reduced. Accordingly, it is possible to cope with the thinning of the portable device.

  Further, when performing communication, a current is passed through the conductive portion 6 of the conductive member 5 to generate a magnetic field. Then, the magnetic flux passes through the housing 2 and performs wireless communication with the reader / writer device of the other party, for example. At this time, if the conductive portion 6 is disposed in the groove 3 of the metal housing 2, it is difficult for the magnetic flux to pass because the housing 2 is metallic. Therefore, in the present embodiment, the first through hole 4 penetrating in the thickness direction is provided in a part of the groove 3 of the housing 2. By providing the first through hole 4, even when communication, magnetic flux passes through the first through hole 4 and the housing 2 is made of metal, the passability is improved.

  In the mobile device built-in antenna device 1 according to the present embodiment, three first through holes 4 are formed at a predetermined pitch in each of the opposing long side portions of the groove 3. Each first through hole 4 has a rectangular shape when viewed from above, and the width in the direction crossing the groove 3 is slightly larger than the width of the groove 3. However, the size and number of the first through holes 4 are not limited to this, and are appropriately determined in consideration of the strength of the housing 2. If the size of the first through-hole 4 is large and the number thereof is large, the magnetic flux passing property is further improved, but the strength of the housing 2 is weakened. On the other hand, if the size of the first through-hole 4 is small and the number is small, the improvement of the magnetic flux passage is small, but the strength of the housing 2 is not so weak. Therefore, it is preferable to make the size of the first through hole 4 as large as possible and to increase the number as much as possible after securing the minimum strength of the housing 2 in consideration of the environment in which the housing 2 is used. . If the first through hole 4 is provided in the entire groove 3, the mechanical strength of the housing 2 becomes extremely weak. Therefore, in this embodiment, the first through hole 4 is formed in a part of the groove 3 of the housing 2. One through hole 4 is provided.

In the portable device built-in antenna device 1 according to the present embodiment, the magnetic body 8 is disposed between the conductive member 5 and the bottom of the groove 3 in the groove 3. When the housing 2 is made of metal, eddy current is generated by magnetic flux during communication, and efficient communication cannot be performed. By arranging the magnetic body 8 between the conductive member 5 and the bottom of the groove 3, it is possible to avoid generation of eddy current due to magnetic flux during communication.
Furthermore, in the portable device built-in antenna device 1 according to the present embodiment, the magnetic body 8 is formed in a sheet shape. For this reason, when manufacturing the portable device built-in antenna device 1, the magnetic body 8 can be easily disposed in the groove 3 by laying the sheet-like magnetic body 8 on the bottom of the groove 3.

Next, a second embodiment of the portable device built-in antenna structure according to the present invention will be described with reference to FIG.
The portable device built-in antenna structure 1 shown in FIG. 8 has the same basic configuration as the portable device built-in antenna structure 1 shown in FIG. The difference is that a plurality of second through-holes 9 penetrating through are formed. In FIG. 8, the same components as those in FIG. 1 are denoted by the same reference numerals.

Here, the 2nd through-hole 9 is specifically, two each on the inner peripheral side and outer peripheral side of each long side part which the groove | channel 3 opposes, and each inner part of the short side part which the groove | channel 3 opposes. One is provided on each of the circumferential side and the outer circumferential side.
Thus, by forming a plurality of second through holes 9 penetrating in the thickness direction in the vicinity of the inner peripheral side and the outer peripheral side of the groove 3, the magnetic flux passes through the second through hole 9 during communication, The passability is further improved.

  Note that the size and number of the second through holes 9 are not limited to the above-described example, and are appropriately determined in consideration of the strength of the housing 2. If the size of the second through hole 9 is large and the number thereof is large, the magnetic flux passing property is further improved, but the strength of the housing 2 is weakened. On the other hand, if the size of the second through-hole 9 is small and the number is small, the improvement of the magnetic flux passage is small, but the strength of the housing 2 is not so weak. Therefore, it is preferable to increase the number of the second through holes 9 as much as possible while ensuring the minimum strength of the casing 2 in consideration of the environment in which the casing 2 is used. .

As mentioned above, although embodiment of this invention has been described, this invention is not limited to this, A various change and improvement can be performed.
For example, the conductive member 5 only needs to include a conductive portion 6 and an insulating portion 7 that insulates the conductive portion 6 from the housing 2, and includes a coil in which a metal plate is punched and an insulator in which the coil is insert-molded. There is no necessity. The conductive member 5 may be a flexible circuit board or a conductor printed on an insulator.

Further, it is not always necessary to provide the first through hole 4 penetrating in the thickness direction in a part of the groove 3 of the housing 2.
In addition, the magnetic body 8 is not necessarily disposed between the conductive member 5 and the bottom of the groove 3 in the groove 3. For example, when there is no metal member in the vicinity of the casing 2 of the portable device, the magnetic body 8 can be omitted.

The magnetic body 8 is not necessarily in the form of a sheet, and a magnetic coating material may be applied to the bottom surface of the groove 3.
In the housing 2, it is not always necessary to form a plurality of second through holes 9 penetrating in the thickness direction in the vicinity of the inner peripheral side and the outer peripheral side of the groove 3. Moreover, when forming the 2nd through-hole 9, it should just be the vicinity of the groove | channel 3, It does not ask | require whether it is the inner peripheral side of the groove | channel 3, or an outer peripheral side.
Furthermore, when forming the 2nd through-hole 9, although not shown in figure, the several 2nd through-hole 9 is good to arrange | position at a grid | lattice form. Thereby, the permeability | transmittance of magnetic flux can be improved more.

DESCRIPTION OF SYMBOLS 1 Mobile device built-in antenna structure 2 Case 3 Groove 4 1st through-hole 5 Conductive member 6 Conductive part 7 Insulating part 8 Magnetic body 9 2nd through-hole

Claims (8)

A portable device built-in antenna structure that performs wireless communication through magnetic flux,
A groove of a specific portion is formed with a groove recessed in the thickness direction, and a metal portable device housing, and a conductive member disposed in the groove of the housing,
The portable member built-in antenna structure, wherein the conductive member includes a conductive portion and an insulating portion that insulates the conductive portion from the housing.   The portable device built-in antenna structure according to claim 1, wherein a first through hole penetrating in the thickness direction is provided in a part of the groove of the housing.   3. The portable device built-in antenna structure according to claim 1, wherein a magnetic material is disposed between the conductive member and the bottom of the groove in the groove.   The portable device built-in antenna structure according to claim 3, wherein the magnetic body has a sheet shape.   5. The portable device built-in antenna structure according to claim 1, wherein a second through hole penetrating in the thickness direction is provided in the vicinity of the groove of the housing.   The portable device built-in antenna structure according to claim 5, wherein a plurality of the second through holes are provided and arranged in a lattice shape.   7. The conductive member according to claim 1, wherein the conductive member includes a coil obtained by punching a metal plate as the conductive part, and an insulator in which the coil is insert-molded as the insulating part. The portable device built-in antenna structure according to one item.   The portable device built-in antenna structure according to claim 1, wherein the conductive member is a flexible circuit board or a conductor printed on an insulator.

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