WO2015016353A1 - アンテナ装置及び通信端末機器 - Google Patents
アンテナ装置及び通信端末機器 Download PDFInfo
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- WO2015016353A1 WO2015016353A1 PCT/JP2014/070366 JP2014070366W WO2015016353A1 WO 2015016353 A1 WO2015016353 A1 WO 2015016353A1 JP 2014070366 W JP2014070366 W JP 2014070366W WO 2015016353 A1 WO2015016353 A1 WO 2015016353A1
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- insulating base
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
Definitions
- the present invention relates to an antenna device, for example, an antenna device used in a non-contact communication system such as NFC (Near Field Communication) and a communication terminal device including the antenna device.
- NFC Near Field Communication
- an antenna device used in a 13.56 MHz band non-contact communication system is built in a portable terminal or the like.
- this type of antenna device as described in Patent Documents 1, 2, and 3, a coil pattern wound spirally on a plane is used as an antenna.
- any one of the end portions is drawn to the outside through a via-hole conductor.
- the antenna device avoid deterioration of the antenna characteristics, and when the magnetic body as one component is a sintered body, the cracking of the sintered body is prevented to prevent the deterioration of the antenna characteristics. That is required. In addition, it is also required to obtain good communication characteristics by making the communication distance between the antenna and the antenna that is the communication counterpart closer.
- the antenna device it is necessary to prevent the magnetic field generated from the antenna pattern from being transmitted to other wiring conductors.
- the wiring conductor When bending the wiring conductor, it is easy to bend or avoid stress concentration. It is also necessary to reinforce the strength by preventing disconnection and ensuring connection reliability.
- An object of the present invention is to provide an antenna device and a communication terminal device that can be manufactured without using a via-hole conductor and can be easily routed for connection to the outside.
- the antenna device is: A first insulating base part; An antenna pattern formed in a spiral shape having one end and the other end in the first insulating base member; A second insulating base part; A wiring conductor formed on the second insulating base portion; With In a plan view, an insulating layer for insulating the wiring conductor and the antenna pattern is interposed in a region between the one end and the other end of the antenna pattern, The wiring conductor has a plurality of electrode portions electrically and mechanically connected to one end and the other end of the antenna pattern via a conductive material, respectively.
- the insulating layer has a notch or an opening that exposes at least one of one end and the other end of the antenna pattern on the wiring conductor side in a state before the wiring conductor is connected to the antenna pattern, In the portion where the notch or opening of the insulating layer is formed, the wiring conductor and the antenna pattern are connected via the conductive material,
- the second insulating base part is more flexible than the first insulating base part, It is characterized by.
- a communication terminal device incorporates the antenna device and a printed wiring board in a housing, and the printed wiring board includes at least a noise filter unit and a matching unit, and the second insulating substrate.
- the wiring conductor of the material part is connected to the noise filter part or the matching part.
- the one end portion and the other end portion of the antenna pattern formed on the first insulating base portion are electrode portions of wiring conductors formed on the second insulating base portion, respectively. Can be manufactured without using a via-hole conductor. Moreover, since the second insulating base material portion is excellent in flexibility, it is easy to route on the wiring.
- the lead-out wiring conductor does not cancel so much the magnetic field generated in the coil pattern used as the antenna in order to avoid deterioration of the antenna characteristics. Furthermore, when the magnetic body arranged in the vicinity of the antenna is a sintered body, the structure and arrangement of the sintered body are required in consideration of cracks in the sintered body.
- an antenna device that can prevent the deterioration of antenna characteristics by preventing the magnetic field generated by the antenna pattern from canceling out the magnetic field generated by the lead conductor as much as possible is desired.
- the sintered body made of a magnetic material arranged in the vicinity of the antenna pattern can be made difficult to crack and the antenna characteristics can be improved, and even if it is cracked, the influence on performance can be eliminated as much as possible.
- An antenna device is desired.
- the antenna device which is the third form is A first insulating base part; An antenna pattern formed in a spiral shape having one end and the other end in the first insulating base member; A second insulating base part; At least two wiring conductors formed on the second insulating base portion; With The two wiring conductors are electrically connected to one end and the other end of the antenna pattern, respectively, and the pattern arranged on the outermost periphery of the antenna pattern and one wiring conductor closest to the pattern The same direction of current flows through It is characterized by.
- the pattern arranged on the outermost periphery of the antenna pattern formed in a spiral shape greatly contributes to the characteristics as an antenna.
- the antenna device which is the fourth form is A first insulating base part; An antenna pattern formed in a spiral shape having one end and the other end in the first insulating base member; A second insulating base part; At least two wiring conductors formed on the second insulating base portion; A magnetic member disposed between the first insulating base portion and the second insulating base portion; With The two wiring conductors are electrically connected to one end and the other end of the antenna pattern, respectively, and the pattern arranged on the outermost periphery of the antenna pattern and one wiring conductor closest to the pattern And a current in the opposite direction flows, It is characterized by.
- the magnetic material is arranged close to the antenna pattern, the magnetic field near the antenna pattern can be increased, and the pattern arranged on the outermost periphery of the antenna pattern and the pattern Since the current in the opposite direction flows to the closest wiring conductor, the magnetic field generated in the outermost pattern and the magnetic field generated in the adjacent wiring conductor flow in the same direction inside the magnetic body and cancel each other. And deterioration of antenna characteristics is prevented.
- the antenna device which is the fifth form is A first insulating base part; An antenna pattern formed in a spiral shape having one end and the other end in the first insulating base member; A second insulating base part; At least two wiring conductors formed on the second insulating base portion; A magnetic member disposed between the first insulating base portion and the second insulating base portion; With The two wiring conductors are electrically connected to one end and the other end of the antenna pattern, respectively.
- the magnetic member is composed of a sintered body of a magnetic material and a support sheet attached to the sintered body, and the sintered body is disposed on the first insulating base part side, The carrier sheet is disposed on the second insulating base portion side; It is characterized by.
- the carrier sheet is attached to the sintered body of the magnetic material, the sintered body is difficult to break, and the sintered body is on the first insulating base part side. (Ie, on the antenna pattern side), the magnetic flux density of the antenna pattern is increased and the antenna characteristics are improved.
- the antenna device which is the sixth form is A first insulating base part; An antenna pattern formed in a spiral shape having one end and the other end in the first insulating base member; A second insulating base part; At least two wiring conductors formed on the second insulating base portion; A sintered body of a magnetic material disposed between the first insulating base portion and the second insulating base portion; With The two wiring conductors are electrically connected to one end and the other end of the antenna pattern, respectively.
- a plurality of slits are formed in a matrix in the sintered body, and the slits are formed in a direction along the direction of magnetic flux generated from the antenna pattern in a region close to the antenna pattern. , It is characterized by.
- the sintered body of the magnetic material is easily broken, slits are formed in advance in a matrix. Since the slit is formed in a direction along the direction of the magnetic flux generated from the antenna pattern in a region close to the antenna pattern, the magnetic field generated from the antenna pattern is not blocked, and a decrease in magnetic permeability is prevented.
- the antenna device which is the seventh form is A first insulating base part; An antenna pattern formed in a spiral shape having one end and the other end in the first insulating base member; A second insulating base part; At least two wiring conductors formed on the second insulating base portion; A sintered body of a magnetic material disposed between the first insulating base portion and the second insulating base portion; With The two wiring conductors are electrically connected to one end and the other end of the antenna pattern, respectively.
- a plurality of slits are formed in a matrix in the sintered body except for a region close to the antenna pattern, It is characterized by.
- the gap between the slits may fluctuate and the permeability may change.
- the plurality of slits formed in a matrix are not formed in a region close to the antenna pattern. Therefore, in the region close to the antenna pattern, the slit interval does not fluctuate and the magnetic permeability is prevented from being lowered.
- the antenna device which is the eighth form is A first insulating base part; An antenna pattern formed on the first insulating base and formed in a spiral shape; A second insulating base part; A wiring conductor formed on the second insulating base portion, having one end connected to the antenna pattern and the other end connected to an external connection terminal; With When viewed from the winding axis direction of the antenna pattern, at least a part of the wiring conductor is overlapped with the antenna pattern, In the region where the antenna pattern and the wiring conductor are overlapped, a magnetic sheet is disposed between the antenna pattern and the wiring conductor; It is characterized by.
- the magnetic sheet since the magnetic sheet is disposed between the antenna pattern and the wiring conductor, the magnetic field generated from the antenna pattern can be prevented from being transmitted to the wiring conductor, and the antenna characteristics are deteriorated. Is prevented. It is preferable that the magnetic sheet covers a coil opening of the antenna pattern. In addition, when viewed from the winding axis direction of the antenna pattern, it is preferable that the second insulating base portion is housed in the outer shape of the first insulating base portion. The antenna device can be downsized.
- the connecting portion between the antenna pattern and the wiring conductor is preferably smaller in thickness than the portion provided with the external connection terminals. If the thickness is small, the flexibility is increased and the wire conductor is easily bent, and disconnection of the wiring conductor can be prevented. Moreover, it is preferable that the 2nd insulating base material part laminates
- the second insulating base portion is thinner than the first insulating base portion, and the first insulating base portion includes a magnetic sheet and a first insulating base on which an antenna pattern is formed.
- the first insulating base material preferably has a smaller thickness than the second insulating base material portion.
- the second insulating base part is more flexible than the first insulating base part and can be easily bent.
- the antenna device which is the ninth form is A first insulating base part; An antenna pattern formed on the first insulating base and formed in a spiral shape; A second insulating base part; A wiring conductor formed on the second insulating base portion, one end connected to the antenna pattern and the other end connected to an external connection terminal;
- the first insulating base material portion includes a first insulating base material on which the antenna pattern is formed,
- the first insulating substrate has a thickness smaller than that of the second insulating substrate; It is characterized by.
- the antenna pattern formed on the first insulating base is closer to the antenna that is the communication partner. Communication characteristics are improved.
- the flexible first insulating base material can easily follow the shape of an article such as a casing to which the antenna device (first insulating base material) is attached. Further, it is possible to eliminate the fear of the wiring conductor being displaced or disconnected.
- the second insulating base portion includes a second insulating base on which a wiring conductor is formed, and the first insulating base and the second insulating base are composed of the same main material. It is preferable. If the 1st and 2nd insulating base materials are comprised with the same material, it will become difficult to generate
- the line width of at least the connection portion of the wiring conductor with the antenna pattern is larger than the line width of the antenna pattern. Disconnection is less likely to occur at the connection portion between the wiring conductor and the antenna pattern, and connection reliability is improved.
- the antenna device is characterized in that the external connection terminal of the wiring conductor is drawn out to the front surface and / or the back surface of the second insulating base member via the interlayer connection conductor.
- a heating member such as a hot bar
- the external connection terminal located on the opposite side can be easily joined to the land of the printed wiring board via solder etc. can do.
- the external connection terminal exposed on the opposite surface may be joined to the land of the printed wiring board by applying a heating member to the wiring conductor exposed on the front surface or the back surface of the second insulating base portion.
- the present invention can be manufactured without using a via-hole conductor and can be easily routed for connection to the outside.
- the magnetic material is not easily broken, the antenna characteristics are improved, and even if it is broken, the influence on the performance can be eliminated as much as possible.
- FIG. 30 is a cross-sectional view of FIG. 29. It is a disassembled perspective view which shows the antenna apparatus which is 7th Example. It is a top view of the antenna apparatus which is 7th Example. It is sectional drawing of FIG. It is sectional drawing which shows the 1st modification in 7th Example. It is sectional drawing which shows the 2nd modification in 7th Example. It is sectional drawing which shows the 3rd modification in 7th Example. It is sectional drawing which shows the 4th modification in 7th Example. It is a disassembled perspective view which shows the 5th modification in 7th Example. It is sectional drawing of FIG.
- FIG. 43 is a cross-sectional view of FIG. 42. It is a top view which shows the 2nd example of arrangement
- A) is sectional drawing which shows the 3rd example of arrangement
- B is sectional drawing which shows a comparative example.
- the antenna device 1 As shown in FIG. 1, the antenna device 1 according to the first embodiment is used for an HF band NFC, an RFID system, and the like, and roughly, the first insulating base portion A and the second insulation are used. It is comprised by the base-material part B.
- the first insulating base material portion A is formed in a spiral shape on the first insulating base material 10 and the main surface of the first insulating base material 10, and one end portion 15a and the other end portion 15b are the main surface.
- the antenna pattern 15 located above, the insulating adhesive layer 20, and the ferrite sheet 25 which is a magnetic material sheet are provided.
- the second insulating base material portion B includes a second insulating base material 30 and wiring conductors 31 and 32 formed on the back surface of the second insulating base material 30.
- the wiring conductors 31 and 32 are respectively electrode portions 31a and 32a soldered (electrically and mechanically connected) to one end 15a and the other end 15b of the antenna pattern 15 on one plane, and external connection terminal portions 31b, 32b.
- the first insulating base material 10 and the second insulating base material 30 are both made of polyimide resin, but the material is not limited to this, and may be, for example, a liquid crystal polymer.
- the second insulating base material 30 has a long shape, and protrudes outward from the first insulating base material 10 in plan view.
- the second insulating base part B is more flexible than the first insulating base part A.
- the main component of the 1st and 2nd insulating base materials 10 and 30 is comprised with the same material, it will become difficult to generate
- the antenna pattern 15 and the wiring conductors 31 and 32 are formed by etching copper foils formed on the base materials 10 and 30, respectively. However, it is needless to say that it may be formed by other methods.
- the insulating adhesive layer 20 prevents the antenna pattern 15 from being short-circuited by the wiring conductor 32 intersecting the antenna pattern 15 in plan view.
- the first insulating base material 10 on which the antenna pattern 15 is formed in advance is provided. It is formed on the back surface of the second insulating base material 30 on which the wiring conductors 31 and 32 are previously formed by pattern printing.
- the insulating adhesive layer 20 may be adhered with an adhesive sheet.
- the insulating adhesive layer 20 is also used for bonding the ferrite sheet 25 and the first insulating base material 10 together.
- the second insulating base material 30 is bonded to the first insulating base material 10 via the insulating adhesive layer 20, and the notches 20 a and 20 c of the insulating adhesive layer 20 and the ferrite sheet 25 are cut.
- the one end portion 15a and the other end portion 15b of the antenna pattern 15 are soldered to the electrode portions 31a and 32a of the wiring conductors 31 and 32, respectively, via the notches 25a (see solder 40 in FIG. 2).
- a bridging portion 20b for insulating the electrode portions 31a and 32a is formed in the notch 20a of the insulating adhesive layer 20.
- the notches 20a and 20c of the insulating adhesive layer 20 can be formed by patterning at the time of application, or by preparing an adhesive sheet provided with such notches 20a and 20c in advance.
- the insulating adhesive layer 20 is fixed while being slightly pressurized in a heating (reflow) process such as soldering.
- the insulating adhesive layer 20 flows by this heating.
- the bridging portion 20b for insulation also flows and covers a part of the antenna pattern 15 in plan view, and one end 15a and the other end 15b of the antenna pattern 15 in the first insulating substrate 10 Get into the area between.
- the presence of the bridging portion 20b for insulation can prevent the antenna pattern 15 from being short-circuited by the wiring conductor 32.
- one end 15a and the other end 15b of the antenna pattern 15 formed on the main surface of the first insulating base 10 are formed on the second insulating base 30, respectively. Since the electrode portions 31a and 32a of the wiring conductors 31 and 32 thus formed are electrically and mechanically connected on a plane, it is not necessary to use a via-hole conductor, and it can be easily manufactured. Moreover, since the 2nd insulation base material part B protrudes from the 1st insulation base material part A, since it is excellent in flexibility, it can be drawn on wiring easily.
- the ferrite sheet 25 forms a notch 25a to join the first insulating base material 10 and the second insulating base material 30. That is, the notch 25a and the notches 20a and 20c of the insulating adhesive layer 20 expose the one end 15a and the other end 15b of the antenna pattern 15 to the outside.
- the ferrite sheet 25 has an action of preventing magnetic field leakage generated from the antenna pattern 15 and strengthening magnetic field coupling so that an external magnetic field and a high-frequency signal are preferably input to the antenna pattern 15.
- the ferrite sheet 25 can prevent leakage of a magnetic field radiated from the antenna pattern 15 at both side portions of the notch 25a.
- FIG. 2 shows a cross section taken along line XX shown in FIG. 1 for easy understanding of the connection relationship. In the cross sectional views up to FIG. Show.
- the first insulating base material 10 is made of polyimide resin, and its thickness D1 is 10 to 15 ⁇ m.
- the antenna pattern 15 is made of copper foil, and the thickness D2 is 15 to 35 ⁇ m.
- the insulating adhesive layer 20 is made of an epoxy resin, and its thickness D3 is 25 to 45 ⁇ m.
- the ferrite sheet 25 is made of a Ni—Zn sintered body and has a thickness D4 of 100 to 150 ⁇ m.
- the second insulating substrate 30 is made of a polyimide resin, and the thickness D5 is 50 to 100 ⁇ m.
- the wiring conductors 31 and 32 are made of copper foil, and the thickness D6 is 10 to 20 ⁇ m.
- the solder 40 is precoated on the wiring conductors 31 and 32, and its thickness D7 is 10 to 30 ⁇ m.
- the thickness D1 of the first insulating substrate 10 is 10 ⁇ m
- the thickness D2 of the antenna pattern 15 is 20 ⁇ m
- the thickness D3 of the insulating adhesive layer 20 is 30 ⁇ m
- the thickness D4 of the ferrite sheet 25 is 120 ⁇ m
- the second insulating base The thickness D5 of the material 30 is 100 ⁇ m
- the thickness D6 of the wiring conductors 31 and 32 is 16 ⁇ m
- the thickness D7 of the solder 40 is 10 ⁇ m.
- the 2nd insulation base material part B is excellent in flexibility rather than the said 1st insulation base material part A.
- the thickness of each member does not necessarily match the specific thickness value described here.
- the thickness D3 of the insulating adhesive layer 20 is preferably smaller than the thickness D4 of the ferrite sheet 25. By reducing the thickness D3 of the insulating adhesive layer 20, it becomes easy to join the pattern 15 and the conductors 31, 32 by the solder 40 while sandwiching the insulating adhesive layer 20 therebetween. Further, the thickness D3 of the insulating adhesive layer 20 is preferably larger than the thickness D2 of the antenna pattern 15. Thereby, unnecessary conduction (short circuit) between the antenna pattern 15 and the wiring conductors 31 and 32 can be prevented.
- the thickness D1 of the first insulating base material 10 is preferably smaller than the thickness D2 of the antenna pattern 15. Thereby, the overall thickness of the antenna device 1 can be reduced while reducing the conductor loss.
- the cross section in the width direction of the antenna pattern 15 trapezoidal, the space P between the upper surfaces is widened, the fluidity of the adhesive layer 20 is increased, and the pressure in the arrow direction acting on the pattern 15 is reduced. As a result, the pattern 15 is hardly peeled off. Moreover, when the fluidity of the adhesive layer 20 is improved, the bonding by the solder 40 is also improved. In order to make it difficult for the pattern 15 to peel off due to the flow pressure of the adhesive layer 20, the surface roughness of the side surface (that is, the lower surface) of the antenna pattern 15 in contact with the first insulating substrate 10 may be increased.
- the trapezoidal shape of the cross section in the width direction of the antenna pattern 15 can be achieved, for example, by adjusting the etching rate when the pattern 15 is formed by etching.
- the first insulating base material 10 and the second insulating base material 30 are formed by first forming the antenna patterns 15 in a matrix on the mother sheets 51 and 52 having a large area, and the wiring conductor 31. , 32 are also formed in a matrix. These are cut into one unit of the antenna pattern 15 and the wiring conductors 31 and 32, and then both (the base materials 10 and 30) are cut out, and the insulating adhesive layer 20 formed with the cutouts 20a and 20c and the ferrite sheet formed with the cutouts 25a. Lamination and bonding may be performed via 25. By doing so, the number of base materials 10 and 30 can be increased.
- the antenna pattern 15 and the wiring conductors 31 and 32 may be connected in a form in which the second insulating base material 30 is disposed at a corner portion of the first insulating base material 10. Further, as shown in FIG. 6, the antenna pattern 15 and the wiring conductors 31 and 32 are arranged so that the second insulating base 30 does not protrude to the outside in the upper half portion of the first insulating base 10 in the figure. You may connect in the form to do.
- the end portions 15a and 15b of the antenna pattern 15 and the electrode portions 31a and 32a of the wiring conductors 31 and 32 are electrically connected on a plane without fear of short-circuiting each other. And mechanical connection.
- the communication terminal device 61 is, for example, a mobile phone, and the antenna device 1 is attached to the bottom surface of the housing 65 via an adhesive layer 66.
- the second insulating substrate 30 is folded 180 degrees, and the matching elements (capacitors) in which the terminal portions 31 b and 32 b that are the end portions of the wiring conductors 31 and 32 are mounted on the printed wiring board 70 via the solder 71. 72 is electrically connected.
- a noise filter 73 and the like are also mounted on the printed wiring board 70.
- the circuit of the connection portion in the communication terminal device 61 includes a noise filter unit 81 and a matching unit 82 connected to the IC 80, and the antenna device 1 is connected to the matching unit 82.
- the wiring conductor 31 is used as a connection portion with the matching portion 82, and the wiring conductor 32 is used as a connection portion to the ground.
- the antenna device 2 according to the second embodiment is formed by forming the second insulating base 30 with a member having a relatively thick plasticity. Wrapped.
- the connection form of the communication terminal device to the printed wiring board is the same as that shown in FIG.
- the communication terminal device 62 as the second example uses the connection form shown in FIG. That is, as shown in FIG. 10, the communication terminal device 62 folds the second insulating base material 30 right above the first insulating base material 10, and solders 71 the terminal portions 31 b and 32 b of the wiring conductors 31 and 32. And connected to a matching element on the printed wiring board 70.
- the antenna device 1 since the folded back second insulating base material 30 does not protrude outside from the outer periphery of the first insulating base material 10, the antenna device 1 itself can be downsized.
- a communication terminal device 63 as a third example uses the connection form shown in FIG. That is, as shown in FIG. 11, the communication terminal device 63 lifts the other end of the second insulating substrate 30 upward, and the terminal portions 31 b and 32 b of the wiring conductors 31 and 32 are placed on the upper surface side of the printed wiring board 70. And connected to a matching element via solder 71. Note that the printed wiring board 70 is supported by a support member (not shown) at a position overlapping the first insulating base material 10 in plan view.
- the antenna device 3 forms a second insulating base material 30 in a bifurcated shape (not shown because it is arranged on the back surface),
- the terminal portions 31b and 32b of 32 are slightly lifted upward.
- the connection form of the wiring conductors 31 and 32 to the printed wiring board is similar to the form shown in FIG.
- the antenna device 4 according to the fourth embodiment is formed by bending the second insulating base material 30 at a plurality of locations into a coil shape, and gradually lifting the coil portion.
- the antenna device 3 is the same, but the second insulating base material 30 has a large elastic deformation force in the thickness direction, and the electrode portions 31 a of the wiring conductors 31 and 32. It is possible to effectively prevent stress concentration at the joint between 32a and the antenna pattern 15, and the second insulating substrate 30 is not easily broken.
- FIG. 14A As shown in FIG. 14A, by forming a through hole 81 in a portion where the wiring conductors 31 and 32 of the second insulating substrate 30 are formed, the solder 40 is formed as shown in FIG. The through hole 81 is wetted and filled. As a result, the connecting portions between the wiring conductors 31 and 32 and the antenna pattern 15 are reinforced.
- the through hole 81 can be formed by, for example, the process shown in FIG.
- Metal films 82 are formed on the upper and lower surfaces of the base material 30 (see FIG. 15A), and holes 83 are formed (see FIG. 15B).
- an electroless plating film 84 including the metal film 82 is formed on the inner peripheral surface of the hole 83 (see FIG. 15C), and an electrolytic plating film 85 is formed on the electroless plating film 84 (see FIG. 15C). (See FIG. 15D).
- conductors are not necessarily formed in the through hole 81, and the hole 83 may be simply formed. That is, if the hole 83 is filled in a state where the solder 40 is melted, it is not necessary to form a conductor in the hole 83.
- connection portions are covered with a resin material 86 after the wiring conductors 31 and 32 are connected to the antenna pattern 15.
- the resin material 86 functions as a reinforcing material.
- the resin material 86 may be the same material as the insulating adhesive layer 20.
- the third example of reinforcement shown in FIG. 17 can be said to be a modification of the second example, and a step 34 is formed at the edge of the second insulating base material 30 so as to be covered with a resin material 86. . Further, the resin material 86 is also wound around the lower surface side of the first insulating base material 10.
- the same material as the insulating adhesive layer 20 is coated as the resin material 86 by screen printing or potting, and the resin material 86 is cured by UV irradiation or a heating process.
- a through hole 91 is formed in the second insulating substrate 30 so as to penetrate the front and back surfaces of the second insulating substrate 30, and the reinforcing resin material 86 is filled in the through hole 91.
- the through hole 91 may be formed in a portion where the wiring conductors 31 and 32 are not provided.
- a through-hole 92 that penetrates the second insulating base material 30 is formed on the front and back sides, and the front and back sides of the first insulating base material 10 and the insulating adhesive layer 20 are also provided.
- a through hole 93 is formed in the through hole 92, and a reinforcing resin material 86 is filled in the through holes 92 and 93.
- the through holes 92 and 93 are formed in portions where the wiring conductors 31 and 32 and the antenna pattern 15 are not provided.
- the through holes 92 and 93 are shown to be formed coaxially, but are not necessarily coaxial.
- the antenna device 5 has a spiral shape having a first insulating base material portion A and one end portion 15a and the other end portion 15b in the first insulating base material portion A.
- the antenna pattern 15 formed in the above, the second insulating base part B, and at least two wiring conductors 31 and 32 formed on the second insulating base part B are provided.
- the two wiring conductors 31 and 32 are electrically connected to the one end portion 15a and the other end portion 15b of the antenna pattern 15, respectively, and the pattern arranged on the outermost periphery of the antenna pattern 15 is closest to the pattern 1 A current in the same direction f flows through the wiring conductor 31 (see FIG. 21 which is a plan view).
- an insulating adhesive layer 20 is interposed between the first insulating base material 10 and the second insulating base material 30. More specifically, the insulating adhesive layer 20 is provided only in a portion where the wiring conductors 31 and 32 are in contact with the antenna pattern 15, and electrical connection between the electrode portions 31a and 32a and the end portions 15a and 15b. An opening 20d for securing (see solder 40 shown in FIG. 22) is formed. Note that FIG. 22 shows a cross section taken along the line YY shown in FIG. 21, and the following cross-sectional view shows a cross section at the same location.
- the pattern arranged on the outermost periphery of the antenna pattern 15 formed in a spiral shape greatly contributes to the characteristics as an antenna. Therefore, since a current in the same direction f flows in the pattern arranged on the outermost periphery of the antenna pattern 15 and the wiring conductor 31 closest to the pattern, the magnetic field f ′ generated here is as shown in FIG. It is generated in the same direction, and the magnetic field generated from the wiring conductor 31 does not cancel out the magnetic field generated from the pattern arranged on the outermost periphery, thereby preventing the deterioration of the antenna characteristics.
- connection portions (electrode portions 31 a and 31 b) of the wiring conductors 31 and 32 with the antenna pattern 15 is made larger than the line width of the antenna pattern 15.
- the second insulating base material portion B (second insulating base material 30) does not necessarily need to be used in a bent state, as shown in FIG.
- the terminal portions 31 b and 32 b of the wiring conductors 31 and 32 are connected to lands 171 on the printed wiring board 170 via solder 175.
- the second insulating substrate 30 may not be excellent in flexibility.
- a ferrite sheet 180 having substantially the same area as the insulating base material 10 is formed on the back surface of the first insulating base material 10. You may stick through. By disposing the ferrite sheet 180 in the vicinity of the antenna pattern 15, the magnetic field density generated from the antenna pattern 15 can be increased, and the antenna characteristics are improved.
- the second insulating base material 30 is formed by two base materials 30a and 30b joined together in a plane, You may make it connect the other end of the wiring conductors 31 and 32 formed in the lower surface of the base material 30a to the terminal parts 31b and 32b formed in the upper surface of the base material 30b via the interlayer connection conductor 185.
- FIG. By arranging the terminal portions 31 b and 32 b on the upper surface of the insulating base material 30, the terminal portions 31 b and 32 b are soldered to the land 171 of the printed wiring board 170 arranged on the opposite side to the first insulating base material 10.
- connection via the second insulating substrate 30 it is not necessary to bend the second insulating base material 30, and damage to the wiring conductors 31 and 32 accompanying the bending can be prevented.
- a heating member such as a hot bar
- heat is transmitted from the terminal portions 31 b and 32 b to the solder 175 and the land 171 via the interlayer connection conductor 185, and by the solder 175. Bonding can be performed easily.
- the interlayer connection conductor 185 is formed as follows. First, as shown in FIG. 26, the conductive pastes 185a and 185b are filled in the through holes formed in the base materials 30a and 30b made of thermoplastic resin so as to be connected to the wiring conductors 31 and 32 and the terminal portions 31b and 32b, respectively. To do. Thereafter, the base materials 30a and 30b are heat-bonded and the conductive pastes 185a and 185b are solidified. As a result, the conductive pastes 185a and 185b are joined and conducted to form the interlayer connection conductor 185. Note that the through-hole 81 shown in FIG. 15 may be used as the interlayer connection conductor 185. However, if the interlayer connection conductor 185 is formed by the via hole shown in FIG. 26, the plating method required for forming the through-hole is not required, and the manufacturing process is simplified.
- the wiring conductors 31 and 32 are formed on the upper surface of the second insulating substrate 30, and one end thereof is interposed via the interlayer connection conductor 186. It may be connected to the electrode portions 31a and 32a.
- a resist layer 190 is provided on the upper surface of the insulating substrate 30.
- the second insulating base material 30 may be formed by base materials 30a and 30b bonded to each other.
- the wiring conductors 31 and 32 are formed on the upper surface of the base material 30a, and one ends of the wiring conductors 31 and 32 are connected to the electrode portions 31a and 32a formed on the lower surface of the base material 30a via the interlayer connection conductor 186, The other end is connected to terminal portions 31b and 32b formed on the upper surface of the base material 30b via an interlayer connection conductor 185.
- the electrode portions 31a and 31b and the terminal portions 31b and 32b are connected to the end portions 15a and 15b of the antenna pattern 15 and the land 171 of the printed wiring board 170 through solders 40 and 175, respectively.
- the antenna device 6 according to the sixth embodiment is configured such that the wiring conductors 31 and 32 are arranged to overlap each other in the thickness direction in the second insulating base layer B. That is, the wiring conductor 31 is formed on the base material 30a, the wiring conductor 32 is formed on the base material 30b, and the resist layer 190 that covers the wiring conductor 32 is formed on the base material 30b. As shown in FIG. 30, one end of the wiring conductor 31 is connected to an electrode portion 31a formed on the lower surface of the base material 30a via an interlayer connection conductor 186. Although not shown in FIG.
- one end of the wiring conductor 32 is connected to an electrode portion (32a) formed on the lower surface of the base material 30a via an interlayer connection conductor.
- the other end of the wiring conductor 31 is connected to a terminal portion 31b formed on the upper surface of the substrate 30b via an interlayer connection conductor 185 formed on the substrate 30b.
- the other configurations in the sixth embodiment are basically the same as those in the fifth embodiment and the various modifications.
- the wiring conductor 31 closest to the pattern is configured such that a current in the same direction f flows. Therefore, the magnetic field generated from the wiring conductor 31 does not cancel the magnetic field generated from the pattern arranged on the outermost periphery, and the deterioration of the antenna characteristics is prevented.
- the antenna device 7 has a spiral shape having a first insulating base portion A and one end portion 15a and the other end portion 15b in the first insulating base portion A.
- the antenna pattern 15 formed on the second insulating base member B, the second insulating base member B, the at least two wiring conductors 31 and 32 formed on the second insulating base member B, and the first insulating base member.
- a magnetic body member disposed between A and the second insulating base portion B.
- the antenna pattern 15 is wound on the first insulating base material 10 in the opposite direction to the above embodiments.
- the two wiring conductors 31 and 32 are electrically connected to the one end portion 15a and the other end portion 15b of the antenna pattern 15, respectively, and the pattern arranged on the outermost periphery of the antenna pattern 15 is closest to the pattern 1 Currents in opposite directions f and g flow through the wiring conductor 31 (see FIG. 32 which is a plan view).
- an insulating adhesive layer 20 is interposed between the first insulating substrate 10 and the ferrite sheet 25. More specifically, the ferrite sheet 25 and the insulating adhesive layer 20 have substantially the same area as the first insulating base material 10.
- the insulating adhesive layer 20 is formed with an opening 20d for ensuring electrical connection (see solder 40 shown in FIG. 33) between the electrode portions 31a and 32a and the end portions 15a and 15b, and a ferrite sheet. 25 has a notch 25a for the same purpose.
- the magnetic material (ferrite sheet 25) is disposed close to the antenna pattern 15, the magnetic field near the antenna pattern 15 can be increased, and the pattern disposed on the outermost periphery of the antenna pattern 15 Since currents in opposite directions f and g flow through the wiring conductor 31 closest to the pattern, the magnetic field f ′ generated in the outermost pattern and the magnetic field g ′ generated in the wiring conductor 31 adjacent to the pattern are magnetic ( The flow does not cancel out in the same direction inside the ferrite sheet 25), and the deterioration of the antenna characteristics is prevented. For the other effects, the explanation in the fifth embodiment is appropriate.
- the end portions of the wiring conductors 31 and 32 formed on the lower surface of the second insulating substrate 30 are connected to the insulating base via the interlayer connection conductor 185. You may make it connect to the terminal parts 31b and 32b formed in the upper surface of the material 30.
- FIG. By arranging the terminal portions 31 b and 32 b on the upper surface of the insulating base material 30, the terminal portions 31 b and 32 b are soldered to the land 171 of the printed wiring board 170 arranged on the opposite side to the first insulating base material 10. In the case of connection via the second insulating substrate 30, it is not necessary to bend the second insulating base material 30, and damage to the wiring conductors 31 and 32 accompanying the bending can be prevented.
- wiring conductors 31 and 32 are formed on the upper surface of the second insulating base material 30, and one end thereof is connected via an interlayer connection conductor 186. It may be connected to the electrode portions 31a and 32a.
- a resist layer 190 is provided on the upper surface of the insulating substrate 30.
- the second insulating base material 30 may be formed by base materials 30a and 30b bonded to each other.
- the wiring conductors 31 and 32 are formed on the upper surface of the base material 30a, and one ends of the wiring conductors 31 and 32 are connected to the electrode portions 31a and 32a formed on the lower surface of the base material 30a via the interlayer connection conductor 186, The other end is connected to terminal portions 31b and 32b formed on the upper surface of the base material 30b via an interlayer connection conductor 185.
- the electrode portions 31a and 31b and the terminal portions 31b and 32b are connected to the end portions 15a and 15b of the antenna pattern 15 and the land 171 of the printed wiring board 170 through solders 40 and 175, respectively.
- the second insulating base material 30 is formed of three layers (base materials 30a, 30b, 30c), that is, as shown in FIG.
- the other base material 30c is bonded onto the base material 30b, and the terminal portions 31b and 32b are connected to the upper and lower surfaces of the second insulating base material 30 from the other end of the wiring conductors 31 and 32 via the interlayer connection conductor 185.
- 31b ′, 32b ′ are drawn out.
- the terminal portions 31 b and 32 b are connected to the land 171 of the printed wiring board 170 via the solder 175.
- the connecting portion between the antenna pattern 15 and the wiring conductors 31 and 32 and the vicinity thereof have a smaller number of layers and a smaller thickness than the portion where the terminal portions 31b and 32b are provided. If the thickness is small, the flexibility is increased and the wire conductors 31 and 32 can be prevented from being disconnected.
- the second insulating base material 30 is formed by laminating a plurality of base materials (here, three layers), and the wiring conductors 31 and 32 are disposed between the plurality of base materials. Thereby, the wiring conductors 31 and 32 can be effectively protected.
- the thickness of the second insulating base part B is smaller than that of the first insulating base part A.
- the first insulating base material portion A includes an antenna pattern 15, an insulating adhesive layer 20, a magnetic sheet 25, and a first insulating base material 10 on which the antenna pattern 15 is formed on the main surface
- the second insulating base material portion B includes a second insulating base material 30 (30a, 30b, 30c) and wiring conductors 31 and 32 formed on the second insulating base material 30.
- the first insulating base material 10 is smaller in thickness than the second insulating base material 30. Further, the first insulating base material 10 is thinner than the second insulating base material 30.
- the second insulating base material portion B is more flexible than the first insulating base material portion A, is easy to bend, and has the antenna pattern 15 formed thereon.
- the distance of the antenna pattern 15 becomes closer to the antenna or the like that is the communication partner located on the first insulating base material portion A side, and the communication characteristics are improved.
- the flexible first insulating base material 10 can easily follow the shape of an article such as a casing to which the antenna device (first insulating base material 10) is attached. Further, it is possible to eliminate the possibility of displacement or disconnection of the wiring conductors 31 and 32.
- the insulating pattern is formed on the upper surface of the second insulating substrate 30 at the portion where the antenna pattern 15 and the wiring conductors 31 and 32 are joined.
- the ferrite sheet 192 may be attached via the adhesive layer 191.
- the joint portion between the antenna pattern 15 and the wiring conductors 31 and 32 can be more firmly fixed, and the ferrite sheet 192 is provided in the notch 25a of the ferrite sheet 25, so that the magnetic field can be strengthened over the entire antenna pattern 15. it can.
- the antenna device 8 is configured such that the wiring conductors 31 and 32 are arranged so as to overlap in the thickness direction in the second insulating base material layer B in plan view. That is, the wiring conductor 31 is formed on the base material 30a, the wiring conductor 32 is formed on the base material 30b, and the resist layer 190 that covers the wiring conductor 32 is formed on the base material 30b. As shown in FIG. 41, one end of the wiring conductor 31 is connected to an electrode portion 31a formed on the lower surface of the base material 30a via an interlayer connection conductor 186. Although not shown in FIG.
- one end of the wiring conductor 32 is connected to an electrode portion (32a) formed on the lower surface of the substrate 30a via an interlayer connection conductor.
- the other end of the wiring conductor 31 is connected to a terminal portion 31b formed on the upper surface of the substrate 30b via an interlayer connection conductor 185 formed on the substrate 30b.
- the other configurations in the eighth embodiment are basically the same as those in the seventh embodiment and the various modifications.
- currents in opposite directions f and g flow through the wiring conductor 31 closest to the pattern. Therefore, the magnetic field generated in the outermost pattern and the magnetic field generated in the adjacent wiring conductor 31 do not flow and cancel in the same direction inside the magnetic body (ferrite sheet 25), and the deterioration of the antenna characteristics is prevented.
- the explanations in the fifth and seventh embodiments are appropriate.
- FIG. 42 and FIG. 43 show a first example of this, and an antenna formed in a spiral shape having a first insulating base portion A and one end portion 15a and the other end portion 15b in the first insulating base portion A.
- the wiring conductors 31 and 32 are electrically connected to the one end 15a and the other end 15b of the antenna pattern 15, respectively.
- the magnetic member 200 includes a sintered body 201 made of a magnetic material and a support sheet 202 attached to the sintered body 201.
- the sintered body 201 is disposed on the first insulating base material portion A side.
- the supporting sheet 202 is disposed on the second insulating base material portion B side.
- a resin material such as polyethylene terephthalate, polyethylene naphthalate, and polyimide can be suitably used.
- the sintered body 201 made of a magnetic material such as Ni—Zn ferrite is easily cracked. Therefore, the sintered body 201 is hardly broken by sticking the carrier sheet 202 to the sintered body 201 using an adhesive (not shown).
- the sintered body 201 is disposed on the first insulating base portion A side (that is, on the antenna pattern 15 side), the magnetic flux density of the antenna pattern 15 is increased, and the antenna characteristics are improved.
- the supporting sheet 202 is disposed in the vicinity of the second insulating base material portion B, the magnetic permeability in the vicinity thereof is lowered, and the magnetic field formed by the wiring conductors 31 and 32 may interfere with the antenna pattern 15. It is suppressed.
- the two wiring conductors are electrically connected to one end and the other end of the antenna pattern, respectively, and the sintered body has a plurality of slits formed in a matrix,
- the slit may be formed in a direction along the direction of the magnetic flux generated from the antenna pattern in a region close to the antenna pattern.
- the sintered body of the magnetic material is easily broken, it is conceivable to form slits in a matrix in advance.
- the slit is positioned parallel to the linear portion of the antenna pattern in a region close to the antenna pattern, the slit blocks the magnetic flux generated from the antenna pattern, and the magnetic permeability decreases. Therefore, as shown in FIG. 44, the slits 201a formed in a matrix in the sintered body 201 are formed in the direction f ′ along the direction of the magnetic flux generated from the antenna pattern 15. As a result, the slit 201a does not block the magnetic field generated from the antenna pattern 15 (the straight portion thereof), thereby preventing the magnetic permeability from being lowered.
- the slit 201a may penetrate either the front or back main surface of the sintered body 201 or may not penetrate the front or back main surface of the sintered body 201.
- the two wiring conductors are electrically connected to one end and the other end of the antenna pattern, respectively, and the sintered body includes a plurality of elements except for a region close to the antenna pattern. These slits may be formed in a matrix.
- the slit 201a is opened by the force acting at the time of attachment, and the magnetic permeability changes. There is a risk.
- the plurality of slits 201a formed in a matrix are not formed in a region close to the antenna pattern 15. Therefore, in the region close to the antenna pattern 15, the interval between the slits 201a does not fluctuate, and a decrease in magnetic permeability is prevented.
- the antenna device and the communication terminal device according to the present invention are not limited to the above-described embodiments, and can be variously modified within the scope of the gist.
- a ferrite sheet as a magnetic sheet is not always necessary.
- An insulating layer having no adhesiveness may be provided instead of the insulating adhesive layer.
- the insulating layer that does not have adhesiveness does not necessarily cover the entire surface of the first insulating base, and the position corresponding to the bridging portion 20b (see FIG. 1) for insulation, that is, in plan view.
- the first insulating base material is thicker than the second insulating base material. This is because if the first insulating base material is thinner than the second insulating base material, the first insulating base material is relatively easily deformed, and characteristics such as an antenna pattern may be changed.
- the thickness of the second insulating substrate is 50 to 100 ⁇ m
- the thickness of the first insulating substrate can be 60 to 200 ⁇ m.
- the detailed configuration and shape of the antenna pattern and wiring conductor are arbitrary.
- the present invention is not limited to the HF band NFC wireless communication apparatus, but can be used for other frequency bands such as the UHF band and other communication systems.
- the material for connecting the one end portion 15a and the other end portion 15b of the antenna pattern 15 and the electrode portions 31a and 32a of the wiring conductors 31 and 32 is not limited to solder, and other conductive materials such as a conductive adhesive. Can also be used.
- the present invention is useful for an antenna device and a communication terminal device, and is particularly excellent in that it can be manufactured without using a via-hole conductor and can be easily routed for connection to the outside. .
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Abstract
Description
第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された配線導体と、
を備え、
平面視で、前記アンテナパターンの一端部と他端部との間の領域には、前記配線導体と前記アンテナパターンとを絶縁するための絶縁層が介在されており、
前記配線導体は、前記アンテナパターンの一端部と他端部にそれぞれ導電性材料を介して電気的かつ機械的に接続された複数の電極部を有し、
前記絶縁層は、前記配線導体が前記アンテナパターンに接続される前の状態において前記アンテナパターンの一端部及び他端部の少なくとも一方を前記配線導体側に露出する切欠き又は開口部を有し、
前記絶縁層の切欠き又は開口部が形成された部分において、前記配線導体と前記アンテナパターンとが前記導電性材料を介して接続され、
前記第2の絶縁基材部は前記第1の絶縁基材部よりも可撓性に優れていること、
を特徴とする。
第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された少なくとも2本の配線導体と、
を備え、
前記2本の配線導体は前記アンテナパターンの一端部と他端部にそれぞれ電気的に接続され、かつ、前記アンテナパターンの最外周に配置されたパターンと該パターンに最も近接する1本の配線導体とには同じ方向の電流が流れること、
を特徴とする。
第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された少なくとも2本の配線導体と、
前記第1の絶縁基材部と前記第2の絶縁基材部との間に配置された磁性体部材と、
を備え、
前記2本の配線導体は前記アンテナパターンの一端部と他端部にそれぞれ電気的に接続され、かつ、前記アンテナパターンの最外周に配置されたパターンと該パターンに最も近接する1本の配線導体とには反対方向の電流が流れること、
を特徴とする。
第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された少なくとも2本の配線導体と、
前記第1の絶縁基材部と前記第2の絶縁基材部との間に配置された磁性体部材と、
を備え、
前記2本の配線導体は前記アンテナパターンの一端部と他端部にそれぞれ電気的に接続されており、
前記磁性体部材は、磁性体材料の焼結体と該焼結体に貼着された担持シートとからなり、前記焼結体が前記第1の絶縁基材部側に配置されているとともに、前記担持シートが前記第2の絶縁基材部側に配置されていること、
を特徴とする。
第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された少なくとも2本の配線導体と、
前記第1の絶縁基材部と前記第2の絶縁基材部との間に配置された磁性体材料の焼結体と、
を備え、
前記2本の配線導体は前記アンテナパターンの一端部と他端部にそれぞれ電気的に接続されており、
前記焼結体には複数のスリットがマトリクス状に形成されており、かつ、該スリットは前記アンテナパターンに近接した領域では該アンテナパターンから生じる磁束の向きに沿う方向にスリットが形成されていること、
を特徴とする。
第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された少なくとも2本の配線導体と、
前記第1の絶縁基材部と前記第2の絶縁基材部との間に配置された磁性体材料の焼結体と、
を備え、
前記2本の配線導体は前記アンテナパターンの一端部と他端部にそれぞれ電気的に接続されており、
前記焼結体には前記アンテナパターンに近接した領域を除いて複数のスリットがマトリクス状に形成されていること、
を特徴とする。
第1の絶縁基材部と、
前記第1の絶縁基材部に形成され、スパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部に形成され、一端が前記アンテナパターンに接続され、他端が外部接続用端子に接続された配線導体と、
を備え、
前記アンテナパターンの巻回軸方向から見たとき、前記配線導体の少なくとも一部は前記アンテナパターンと重ねられており、
前記アンテナパターンと前記配線導体とが重ねられた領域において、前記アンテナパターンと前記配線導体との間に磁性体シートが配置されていること、
を特徴とする。
第1の絶縁基材部と、
前記第1の絶縁基材部に形成され、スパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部に形成されており、一端が前記アンテナパターンに接続され、他端が外部接続用端子に接続された配線導体と、
を備え、
前記第1の絶縁基材部は前記アンテナパターンが形成された第1の絶縁基材を含み、
前記第1の絶縁基材は前記第2の絶縁基材部よりも厚みが小さいこと、
を特徴とする。
図1に示すように、第1実施例であるアンテナ装置1は、HF帯のNFCやRFIDシステムなどに使用されるものであって、概略、第1の絶縁基材部Aと第2の絶縁基材部Bとで構成されている。第1の絶縁基材部Aは、第1の絶縁基材10と、第1の絶縁基材10の主面上にスパイラル状に形成され、一端部15aと他端部15bとが前記主面上に位置するアンテナパターン15と、絶縁性接着剤層20と、磁性体シートであるフェライトシート25と、を備えている。第2の絶縁基材部Bは、第2の絶縁基材30と、第2の絶縁基材30の裏面に形成された配線導体31,32と、を備えている。
ここで、アンテナ装置1の各構成部材の材料と厚みについて図2を参照して例示する。なお、図2は、接続関係を理解しやすくするために、図1に示すX-Xでの断面を示しており、以下に示す図11までの断面図においても、同様の箇所での断面を示している。
アンテナパターン15の幅方向の横断面形状に関しては、図3に示すように、底面部よりも上面部が小さい台形状であることが好ましい。半田40によるリフローでの接合は、第1及び第2の絶縁基材部A,Bを絶縁性接着剤層20が介在した状態で厚み方向に加圧しつつ行われる。このとき、絶縁性接着剤層20の流動圧力が図3に矢印で示す方向にパターン15に対して作用する。パターン15の横断面形状が矩形であると、接着剤層20の流動性が阻害され、流動圧力が大きく作用してパターン15が第1の絶縁基材10上から剥がれるおそれがある。
第1の絶縁基材10及び第2の絶縁基材30は、図4に示すように、まず、大きな面積のマザーシート51,52上にアンテナパターン15をマトリクス状に形成するとともに、配線導体31,32をもマトリクス状に形成する。これらを一単位のアンテナパターン15及び配線導体31,32に切り分け、その後両者(基材10,30)を切欠き20a,20cを形成した絶縁性接着剤層20及び切欠き25aを形成したフェライトシート25を介して積層・接着するようにしてもよい。こうすることにより、基材10,30の取り個数を多くすることができる。
アンテナパターン15と配線導体31,32とは、図5に示すように、第2の絶縁基材30を第1の絶縁基材10の角部分に配置する形態で接続してもよい。また、図6に示すように、アンテナパターン15と配線導体31,32とを、第2の絶縁基材30を第1の絶縁基材10の図中上半分部分に外部に突出しないように配置する形態で接続してもよい。
ここで、前記アンテナ装置1を備えた通信端末機器の第1例について、図7を参照して説明する。この通信端末機器61は、例えば、携帯電話機であり、前記アンテナ装置1は筺体65の底面部に接着剤層66を介して貼着されている。第2の絶縁基材30は180度折り返されており、配線導体31,32の端部である端子部31b,32bが半田71を介してプリント配線板70に実装されているマッチング素子(コンデンサ)72と電気的に接続されている。プリント配線板70にはノイズフィルタ73なども実装されている。
第2実施例であるアンテナ装置2は、図9に示すように、第2の絶縁基材30を比較的厚みのある可塑性を備えた部材で形成したものであり、塑性変形によってほぼ中心部分で折り返されている。図示しないが、通信端末機器のプリント配線板への接続形態は、図7に示した形態と同様である。
第2例である通信端末機器62は図6に示した接続形態を用いたものである。即ち、通信端末機器62は、図10に示すように、第2の絶縁基材30を第1の絶縁基材10の直上で折り返し、配線導体31,32の端子部31b,32bを半田71を介してプリント配線板70上のマッチング素子に接続したものである。この例では、折り返された第2の絶縁基材30は第1の絶縁基材10の外周から外部に突出することがないので、アンテナ装置1自体を小型化することができる。
第3例である通信端末機器63は図6に示した接続形態を用いたものである。即ち、通信端末機器63は、図11に示すように、第2の絶縁基材30の他端部を上方に持ち上げ、配線導体31,32の端子部31b,32bをプリント配線板70の上面側に半田71を介してマッチング素子に接続したものである。なお、プリント配線板70は、図示しない支持部材により平面視で第1の絶縁基材10に重なる位置で支持されている。
第3実施例であるアンテナ装置3は、図12に示すように、第2の絶縁基材30を二股状に形成し、(裏面に配置されているため図示していないが)配線導体31,32の端子部31b,32b側を若干上方に持ち上げたものである。配線導体31,32のプリント配線板への接続形態は図11に示した形態と類似したものになる。
第4実施例であるアンテナ装置4は、図13に示すように、第2の絶縁基材30を複数個所で折り曲げてコイル状に形成し、コイル部分を徐々に持ち上げたものである。このアンテナ装置4にあっては、前記アンテナ装置3も同様であるが、第2の絶縁基材30は厚み方向に大きな弾性変形力を有することになり、配線導体31,32の電極部31a,32aとアンテナパターン15との接合部への応力集中を効果的に防止することができ、また、第2の絶縁基材30が折れにくくなる。
図14(A)に示すように、第2の絶縁基材30の配線導体31,32を形成した部分にスルーホール81を形成することにより、図14(B)に示すように、半田40がスルーホール81に濡れ上がって充填される。これにて、配線導体31,32とアンテナパターン15との接続部が強度補強される。
図16に示す補強の第2例は、配線導体31,32をアンテナパターン15に接続した後に、接続部分を樹脂材86で覆うようにしたものである。樹脂材86が補強材として機能する。樹脂材86は、絶縁性接着剤層20と同じ材料であってもよい。
図17に示す補強の第3例は、前記第2例の変形例とも言えるもので、第2の絶縁基材30の縁部に段差部34を形成して樹脂材86で覆うようにしている。さらに、樹脂材86を第1の絶縁基材10の下面側にも回り込ませている。この第3例では、樹脂材86として絶縁性接着剤層20と同じ材料をスクリーン印刷やポッティングによって接続部分被覆し、UV照射や加熱プロセスによって樹脂材86を硬化させることが好ましい。補強用の樹脂材86を絶縁性接着剤層20と同じ材料で形成することにより、両者の熱膨張係数が揃えられるので、温度変化による樹脂材86の剥離が生じにくくなる。
図18に示す補強の第4例は、第2の絶縁基材30にその表裏に貫通する貫通孔91を形成し、該貫通孔91に補強用の樹脂材86を充填したものである。貫通孔91は配線導体31,32が設けられていない部分に形成すればよい。
図19に示す補強の第5例は、第2の絶縁基材30にその表裏に貫通する貫通孔92を形成するとともに、第1の絶縁基材10及び絶縁性接着剤層20にもその表裏に貫通する貫通孔93を形成し、該貫通孔92,93に補強用の樹脂材86を充填したものである。貫通孔92,93は配線導体31,32やアンテナパターン15が設けられていない部分に形成される。なお、図19では、貫通孔92,93を同軸上に形成するように示しているが、必ずしも同軸上でなくてもよい。
第5実施例であるアンテナ装置5は、図20に示すように、第1の絶縁基材部Aと、第1の絶縁基材部Aにおいて一端部15aと他端部15bとを有するスパイラル状に形成されたアンテナパターン15と、第2の絶縁基材部Bと、第2の絶縁基材部B上に形成された少なくとも2本の配線導体31,32と、を備えている。2本の配線導体31,32はアンテナパターン15の一端部15aと他端部15bにそれぞれ電気的に接続され、かつ、アンテナパターン15の最外周に配置されたパターンと該パターンに最も近接する1本の配線導体31(平面図である図21参照)とには同じ方向fの電流が流れる。
前記第5実施例であるアンテナ装置5においては、図23に示すように、第1の絶縁基材10の裏面に、絶縁基材10とほぼ同面積のフェライトシート180を絶縁性接着剤層181を介して貼着してもよい。フェライトシート180をアンテナパターン15の近傍に配置することにより、アンテナパターン15から発生する磁界密度を高めることができ、アンテナ特性が向上する。
前記第5実施例であるアンテナ装置5においては、図24及び図25に示すように、第2の絶縁基材30を互いに平面的に接合させた2枚の基材30a,30bで形成し、基材30aの下面に形成した配線導体31,32の他端を層間接続導体185を介して基材30bの上面に形成した端子部31b,32bに接続するようにしてもよい。端子部31b,32bを絶縁基材30の上面に配置することで、第1の絶縁基材10に対して反対側に配置されたプリント配線板170のランド171に端子部31b,32bを半田175を介して接続する場合、第2の絶縁基材30を折り曲げる必要がなく、折曲げに伴う配線導体31,32の破損などを防止できる。また、配線導体31,32の他端部分にホットバーなどの加熱部材を当てることで、熱が層間接続導体185を介して端子部31b,32bから半田175やランド171に伝達され、半田175による接合を容易に行うことができる。
前記第5実施例であるアンテナ装置5においては、図27に示すように、第2の絶縁基材30の上面に配線導体31,32を形成し、それらの一端を層間接続導体186を介して電極部31a,32aに接続したものであってもよい。絶縁基材30の上面にはレジスト層190が設けられている。
前記第5実施例であるアンテナ装置5においては、図28に示すように、互いに張り合わせた基材30a,30bにて第2の絶縁基材30を形成したものであってもよい。詳しくは、基材30aの上面に配線導体31,32を形成し、配線導体31,32の一端は層間接続導体186を介して基材30aの下面に形成した電極部31a,32aに接続され、他端が層間接続導体185を介して基材30bの上面に形成した端子部31b,32bに接続されている。電極部31a,31b及び端子部31b,32bは、それぞれ半田40,175を介して、アンテナパターン15の端部15a,15b及びプリント配線板170のランド171に接続される。
第6実施例であるアンテナ装置6は、図29に示すように、第2の絶縁基材層Bにおいて、配線導体31,32を厚み方向に平面視で重なるように配置したものである。即ち、基材30a上に配線導体31を形成し、基材30b上に配線導体32を形成し、基材30b上には配線導体32を覆うレジスト層190を形成する。図30に示すように、配線導体31の一端は層間接続導体186を介して基材30aの下面に形成した電極部31aに接続されている。配線導体32の一端は、図30では図示されていないが、層間接続導体を介して基材30aの下面に形成した電極部(32a)に接続されている。配線導体31の他端は基材30bに形成した層間接続導体185を介して基材30bの上面に形成した端子部31bに接続されている。
第7実施例であるアンテナ装置7は、図31に示すように、第1の絶縁基材部Aと、第1の絶縁基材部Aにおいて一端部15aと他端部15bとを有するスパイラル状に形成されたアンテナパターン15と、第2の絶縁基材部Bと、第2の絶縁基材部B上に形成された少なくとも2本の配線導体31,32と、第1の絶縁基材部Aと第2の絶縁基材部Bとの間に配置された磁性体部材(フェライトシート25)と、を備えている。本第7実施例において、アンテナパターン15は第1の絶縁基材10上で前記各実施例とは逆方向に巻回されている。2本の配線導体31,32はアンテナパターン15の一端部15aと他端部15bにそれぞれ電気的に接続され、かつ、アンテナパターン15の最外周に配置されたパターンと該パターンに最も近接する1本の配線導体31(平面図である図32参照)とには反対方向f,gの電流が流れる。
前記第7実施例であるアンテナ装置7においては、図34に示すように、第2の絶縁基材30の下面に形成した配線導体31,32の端部を層間接続導体185を介して絶縁基材30の上面に形成した端子部31b,32bに接続するようにしてもよい。端子部31b,32bを絶縁基材30の上面に配置することで、第1の絶縁基材10に対して反対側に配置されたプリント配線板170のランド171に端子部31b,32bを半田175を介して接続する場合、第2の絶縁基材30を折り曲げる必要がなく、折曲げに伴う配線導体31,32の破損などを防止できる。
前記第7実施例であるアンテナ装置7においては、図35に示すように、第2の絶縁基材30の上面に配線導体31,32を形成し、それらの一端を層間接続導体186を介して電極部31a,32aに接続したものであってもよい。絶縁基材30の上面にはレジスト層190が設けられている。
前記第7実施例であるアンテナ装置7においては、図36に示すように、互いに張り合わせた基材30a,30bにて第2の絶縁基材30を形成したものであってもよい。詳しくは、基材30aの上面に配線導体31,32を形成し、配線導体31,32の一端は層間接続導体186を介して基材30aの下面に形成した電極部31a,32aに接続され、他端が層間接続導体185を介して基材30bの上面に形成した端子部31b,32bに接続されている。電極部31a,31b及び端子部31b,32bは、それぞれ半田40,175を介して、アンテナパターン15の端部15a,15b及びプリント配線板170のランド171に接続される。
前記第7実施例であるアンテナ装置7においては、図37に示すように、第2の絶縁基材30を3層(基材30a,30b,30c)にて形成し、即ち、図36に示した基材30b上にいま一つの基材30cを貼り合わせ、配線導体31,32の他端部から層間接続導体185を介して第2の絶縁基材30の上面及び下面に端子部31b,32b,31b’,32b’が引き出されている。そして、端子部31b,32bが半田175を介してプリント配線板170のランド171に接続される。この接続時において、ホットバー300を端子部31b’、32b’に当てることにより、熱が層間接続導体185を介して端子部31b,32bから半田175やランド171に伝達され、半田175による接合を容易に行うことができる。
前記第7実施例であるアンテナ装置7においては、図38及び図39に示すように、アンテナパターン15と配線導体31,32を接合する部分において、第2の絶縁基材30の上面に絶縁性接着剤層191を介してフェライトシート192を貼り付けるようにしてもよい。アンテナパターン15と配線導体31,32との接合部をより強固に固定できるとともに、フェライトシート25の切欠き25aにフェライトシート192が設けられることになり、アンテナパターン15の全体にわたって磁界を強めることができる。
第8実施例であるアンテナ装置8は、図40に示すように、第2の絶縁基材層Bにおいて、配線導体31,32を厚み方向に平面視で重なるように配置したものである。即ち、基材30a上に配線導体31を形成し、基材30b上に配線導体32を形成し、基材30b上には配線導体32を覆うレジスト層190を形成する。図41に示すように、配線導体31の一端は層間接続導体186を介して基材30aの下面に形成した電極部31aに接続されている。配線導体32の一端は、図41では図示されていないが、層間接続導体を介して基材30aの下面に形成した電極部(32a)に接続されている。配線導体31の他端は基材30bに形成した層間接続導体185を介して基材30bの上面に形成した端子部31bに接続されている。
以下に、フェライト焼結体の好ましい配置/構成例について説明する。図42及び図43はその第1例を示し、第1の絶縁基材部Aと、第1の絶縁基材部Aにおいて一端部15aと他端部15bとを有するスパイラル状に形成されたアンテナパターン15と、第2の絶縁基材部Bと、第2の絶縁基材部B上に形成された少なくとも2本の配線導体31,32と、第1の絶縁基材部Aと第2の絶縁基材部Bとの間に配置された磁性体部材200と、を備えている。
また、アンテナ装置としては、第1の絶縁基材部と、第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、第2の絶縁基材部と、第2の絶縁基材部上に形成された少なくとも2本の配線導体と、第1の絶縁基材部と第2の絶縁基材部との間に配置された磁性体材料の焼結体と、を備えており、2本の配線導体はアンテナパターンの一端部と他端部にそれぞれ電気的に接続されており、焼結体には複数のスリットがマトリクス状に形成されており、かつ、該スリットはアンテナパターンに近接した領域では該アンテナパターンから生じる磁束の向きに沿う方向にスリットが形成されていてもよい。
また、アンテナ装置としては、第1の絶縁基材部と、第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、第2の絶縁基材部と、第2の絶縁基材部上に形成された少なくとも2本の配線導体と、第1の絶縁基材部と第2の絶縁基材部との間に配置された磁性体材料の焼結体と、を備えており、2本の配線導体はアンテナパターンの一端部と他端部にそれぞれ電気的に接続されており、かつ、焼結体にはアンテナパターンに近接した領域を除いて複数のスリットがマトリクス状に形成されていてもよい。
なお、本発明に係るアンテナ装置及び通信端末機器は前記実施例に限定するものではなく、その要旨の範囲内で種々に変更することができる。
10…第1の絶縁基材
15…アンテナパターン
20…絶縁性接着剤層
25…フェライトシート
30…第2の絶縁基材
31,32…配線導体
31a,32a…電極部
31b,32b…外部接続用端子部
61,62,63…通信端末機器
81…スルーホール
86…樹脂材
91,92,93…貫通孔
A…第1の絶縁基材部
B…第2の絶縁基材部
200…磁性体部材
201…焼結体
201a…スリット
202…担持シート
Claims (14)
- 第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された配線導体と、
を備え、
平面視で、前記アンテナパターンの一端部と他端部との間の領域には、前記配線導体と前記アンテナパターンとを絶縁するための絶縁層が介在されており、
前記配線導体は、前記アンテナパターンの一端部と他端部にそれぞれ導電性材料を介して電気的かつ機械的に接続された複数の電極部を有し、
前記絶縁層は、前記配線導体が前記アンテナパターンに接続される前の状態において前記アンテナパターンの一端部及び他端部の少なくとも一方を前記配線導体側に露出する切欠き又は開口部を有し、
前記絶縁層の切欠き又は開口部が形成された部分において、前記配線導体と前記アンテナパターンとが前記導電性材料を介して接続され、
前記第2の絶縁基材部は前記第1の絶縁基材部よりも可撓性に優れていること、
を特徴とするアンテナ装置。 - 前記第2の絶縁基材部は前記第1の絶縁基材部から平面視で外方に突出していること、を特徴とする請求項1に記載のアンテナ装置。
- 前記絶縁層は、接着性を有する絶縁性接着剤層であること、を特徴とする請求項1又は請求項2に記載のアンテナ装置。
- 前記第1の絶縁基材部は第1の絶縁基材と該基材の主面側に積層された磁性体シートとを含み、
前記アンテナパターンは前記第1の絶縁基材の主面上に形成されていること、
を特徴とする請求項3に記載のアンテナ装置。 - 前記絶縁性接着剤層の厚みは前記磁性体シートの厚みよりも小さいこと、を特徴とする請求項4に記載のアンテナ装置。
- 前記磁性体シートには前記アンテナパターンの一端部及び他端部に対応する箇所に切欠きが形成されており、
前記アンテナパターンの一端部及び他端部と前記配線導体の電極部とは、前記磁性体シートの切欠き部分において前記導電性材料にて接続されていること、
を特徴とする請求項4又は請求項5に記載のアンテナ装置。 - 前記絶縁性接着剤層は、前記磁性体シートと前記第1の絶縁基材とを接着していること、を特徴とする請求項4ないし請求項6のいずれかに記載のアンテナ装置。
- 前記第1の絶縁基材の厚みは前記アンテナパターンの厚みよりも小さいこと、を特徴とする請求項1ないし請求項7のいずれかに記載のアンテナ装置。
- 前記アンテナパターンの幅方向の横断面が台形状であること、を特徴とする請求項1ないし請求項8のいずれかに記載のアンテナ装置。
- 前記第2の絶縁基材部にはスルーホールが形成されており、
前記アンテナパターンと前記配線導体とを接続する前記導電性材料としての半田が前記スルーホールに濡れ上がっていること、
を特徴とする請求項1ないし請求項9のいずれかに記載のアンテナ装置。 - 前記第2の絶縁基材部は、少なくとも前記配線導体が前記アンテナパターンと接続されている部分を樹脂材にて覆われていること、を特徴とする請求項1ないし請求項10のいずれかに記載のアンテナ装置。
- 前記第1の絶縁基材部及び/又は前記第2の絶縁基材部に表裏に貫通する貫通孔が形成されており、
前記樹脂材が前記貫通孔に充填されていること、
を特徴とする請求項11に記載のアンテナ装置。 - アンテナ装置とプリント配線板とを筺体に内蔵した通信端末機器において、
前記アンテナ装置は、
第1の絶縁基材部と、
前記第1の絶縁基材部において一端部と他端部とを有するスパイラル状に形成されたアンテナパターンと、
第2の絶縁基材部と、
前記第2の絶縁基材部上に形成された配線導体と、
を備え、
平面視で、前記アンテナパターンの一端部と他端部との間の領域には、前記配線導体と前記アンテナパターンとを絶縁するための絶縁層が介在されており、
前記配線導体は、前記アンテナパターンの一端部と他端部にそれぞれ導電性材料を介して電気的かつ機械的に接続された複数の電極部を有し、
前記絶縁層は、前記配線導体が前記アンテナパターンに接続される前の状態において前記アンテナパターンの一端部及び他端部の少なくとも一方を前記配線導体側に露出する切欠き又は開口部を有し、
前記絶縁層の切欠き又は開口部が形成された部分において、前記配線導体と前記アンテナパターンとが前記導電性材料を介して接続され、
前記第2の絶縁基材部は前記第1の絶縁基材部よりも可撓性に優れており、
前記プリント配線板は、少なくともノイズフィルタ部及びマッチング部を備え、
前記第2の絶縁基材部の配線導体が前記ノイズフィルタ部又は前記マッチング部に接続されていること、
を特徴とする通信端末機器。 - 前記第2の絶縁基材部は折り返された状態で前記アンテナパターンと前記ノイズフィルタ部又は前記マッチング部とを接続していること、を特徴とする請求項13に記載の通信端末機器。
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CN201490000221.2U CN204614955U (zh) | 2013-08-02 | 2014-08-01 | 天线装置及通信终端设备 |
US14/604,940 US9893419B2 (en) | 2013-08-02 | 2015-01-26 | Antenna device and communication terminal apparatus |
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US10050339B2 (en) | 2018-08-14 |
US20180123228A1 (en) | 2018-05-03 |
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US20150138030A1 (en) | 2015-05-21 |
US9893419B2 (en) | 2018-02-13 |
JPWO2015016353A1 (ja) | 2017-03-02 |
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