JP5929314B2 - Film antenna device - Google Patents

Description

  The present invention relates to a film antenna device having a film antenna portion in which an antenna element is formed on a film.

  2. Description of the Related Art Conventionally, a film antenna that is attached to an automobile and receives radio waves such as DAB (Digital Audio Broadcast) is known (see, for example, Patent Document 1). In this film antenna, a strip-shaped antenna element having a predetermined pattern is formed on the surface of a film, and a feeding terminal is connected to the antenna element. This film antenna is used by being attached to the inner surface of an automobile window glass.

  There is also known a film antenna device including a film antenna unit and a circuit board unit having an electronic circuit that amplifies a signal received by the film antenna unit (see, for example, Patent Document 2). This circuit board is housed in the case portion. The case part is a separate body from the circuit board part, has a spring metal contact terminal connected to the circuit board part, and a double-sided tape is attached to a flat part around the contact terminal. Then, peel off the release paper of the double-sided tape, and attach the case part to the film antenna part so that the contact terminal contacts the terminal of the antenna element of the film antenna part, so that the circuit board part is electrically connected to the antenna element. Connected.

JP 2000-295023 A JP 2000-196327 A

  However, the conventional film antenna device is manufactured by connecting the case part to the film antenna part, and then the double-sided tape is peeled off due to aging etc., so that the antenna element of the film antenna part and the contact point connected to the circuit board part There was a risk of electrical contact failure with the terminal.

  The subject of this invention is preventing the electrical connection failure of a film antenna part and a circuit board part.

In order to solve the above-mentioned problem, the invention described in claim 1
A film antenna device to be attached to an attachment object,
A film antenna portion having a film having an adhesive surface on one side and an antenna element formed on the film;
A circuit board portion electrically connected to the antenna element of the film antenna portion;
An adhesive member having first and second adhesive surfaces, wherein the first adhesive surface is adhered to the circuit board portion, and the second adhesive surface is adhered to an end portion of the film antenna portion;
A case portion for storing the circuit board portion, the adhesive member, and an end portion of the film antenna portion;
The case portion is
A top case,
A bottom case adapted to the top case, and
The bottom case is
Have a film antenna support portion,
The film antenna support is
A flat surface portion that presses the film antenna portion against the adhesive member is provided.

The invention according to claim 2 is the film antenna device according to claim 1,
The film antenna support portion of the bottom case is bonded to an adhesive surface at an end of the film antenna portion and a second adhesive surface of the adhesive member.

The invention according to claim 3 is the film antenna device according to claim 1 or 2,
The bottom case includes a film antenna guide portion that guides the film antenna portion toward the attachment object.

The invention according to claim 4 is the film antenna device according to any one of claims 1 to 3,
The top case has a protrusion that pushes down the film antenna unit toward the attachment object.

The invention according to claim 5 is the film antenna device according to any one of claims 1 to 3,
The antenna element has an end not in contact with the film,
The circuit board portion has an antenna element connection portion to which the antenna element is electrically connected without being bonded to the adhesive member,
An end portion of the antenna element and the antenna element connection portion are electrically connected by soldering.

The invention according to claim 6 is the film antenna device according to claim 5,
The antenna element is a metal wire.

The invention according to claim 7 is the film antenna device according to claim 5 or 6,
The bottom case has a concave portion in which a solder portion formed by the soldering is accommodated.

  According to the present invention, poor electrical connection between the film antenna portion and the circuit board portion can be prevented.

It is a top view of the film antenna apparatus of an embodiment of the invention. It is an exploded view of the film antenna device seen from above. It is an exploded view of the film antenna device viewed from below. It is a top view of the circuit board part to which the film antenna part was attached. It is a partial cross section figure of a film antenna apparatus.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the illustrated example.

  With reference to FIGS. 1-3, the apparatus structure of the film antenna apparatus 1 of this Embodiment is demonstrated. FIG. 1 is a plan view of a film antenna device 1 according to the present embodiment. FIG. 2 is an exploded view of the film antenna device 1 as viewed from above. FIG. 3 is an exploded view of the film antenna device 1 as viewed from below.

  The film antenna apparatus 1 of this Embodiment is an antenna apparatus attached to the inner surface of the window (window glass) of moving bodies, such as a motor vehicle. The film antenna device 1 is an antenna device that receives DAB radio waves. However, the present invention is not limited to this, and the film antenna device 1 may be an antenna device that receives / transmits radio waves of other communication methods.

  As shown in FIG. 1, the film antenna device 1 according to the present embodiment includes film antenna units 10A and 10B, a case unit 20, a cable 50, and pull tabs 60A and 60B.

  The film antenna units 10A and 10B are band-shaped film antennas. The film antenna unit 10A includes a film 11A and an antenna element 12A. The film 11A is a strip-shaped film member and has, for example, a transparent color. When film 11A is a transparent color, even when film antenna part 10A is pasted on the window glass of an automobile, obstruction of external visual recognition through the passenger's window glass is reduced. The film 11A is made of PET (PolyEthylene Terephthalate) material. An adhesive (pressure-sensitive adhesive) is applied to the surface of the film 11A attached to the window glass, and a release film (not shown) is attached on the adhesive. The thickness of the adhesive of the film 11A is, for example, about 0.03 [mm].

  The antenna element 12A is made of, for example, a copper wire as a metal wire. The diameter of the copper wire of the antenna element 12A is, for example, 0.1 mm. For example, the antenna element 12A is manufactured in a state of being embedded in one surface of the film 11A. The protrusion of the antenna element 12A from the film 11A is, for example, 0.03 to 0.07 [mm]. A flat surface opposite to the surface of the film 11A in which the antenna element 12A is embedded is affixed to the affixing surface to the window glass. This is to prevent bubbles caused by the protruding portion of the antenna element 12A when the film antenna unit 10A is attached to the window glass. The antenna element 12A has an end 12A1 that is not in contact with the film 11A. The antenna element 12A is coated with an insulator such as enamel, except for the end 12A1.

  The film antenna unit 10B includes a film 11B and an antenna element 12B. The antenna element 12B has an end 12B1. The configuration of the film antenna unit 10B is the same as that of the film antenna unit 10A. The film antenna portions 10A and 10B are arranged so that the longitudinal directions of the antenna elements 12A and 12B are aligned with the case portion 20 as a center.

  The case part 20 is a case of a molded product made of resin, and has, for example, a substantially rectangular parallelepiped shape with an R-shaped corner. The case portion 20 houses the end portions of the film antenna portions 10 </ b> A and 10 </ b> B, a circuit board portion 30 and an adhesive member 40 described later, and one end of the cable 50.

  The cable 50 is a coaxial cable. One end of the cable 50 is connected to the circuit board portion 30 in the case portion 20, and a connector 51 is connected to the other end. The cable 50 is connected to a DAB receiver or the like via the connector 51.

  The pull tabs 60A and 60B are members for peeling off a release film (not shown) attached to the adhesive surfaces of the film antenna portions 10A and 10B, and are strongly bonded to the release film.

  Next, the internal configuration of the case unit 20 will be described with reference to FIGS. 2 and 3. As shown in FIGS. 2 and 3, the case portion 20 houses the circuit board portion 30, the adhesive member 40, one end of the cable 50, and the end portions 13 </ b> A and 13 </ b> B of the film antenna portions 10 </ b> A and 10 </ b> B. Of the film antenna part 10A, an end part accommodated in the case part 20 is defined as an end part 13A. Moreover, let the edge part accommodated in the case part 20 be the edge part 13B among the film antenna parts 10B.

  The case part 20 includes a top case 20a, a bottom case 20b, and a male screw 20c.

  The top case 20a is a case (cover) on the upper side of the case portion 20 (the side opposite to the window glass side of the automobile). The top case 20a includes a cover main body portion 21a, a protrusion 22a, a female screw portion 23a, a cable support portion 24a, and a rib 25a.

  The cover main body 21a is a main body of the top case 20a and has a substantially rectangular parallelepiped shape with a bottom opened. The protrusions 22a are provided on two opposing side surfaces of the top case 20a and have a function of pressing the film antenna portions 10A and 10B downward. The female screw portion 23a is provided inside the top case 20a, and the male screw 20c is screwed together.

  The cable support portion 24a is provided on one side surface portion of the top case 20a, and sandwiches and supports the cable 50 together with the cable support portion 24b. The rib 25a is provided inside the top case 20a, and positions and supports the height of the circuit board portion 30.

  The bottom case 20b is a case (cover) on the lower side of the case portion 20 (the window glass side of the automobile), and is fitted to the top case 20a. The bottom case 20b includes a cover body 21b, a film antenna guide 22b, a hole 23b, a cable support 24b, a film antenna support 25b, and a recess 26b.

  The cover main body 21b is the main body of the bottom case 20b. The film antenna guide part 22b is provided at a position corresponding to the protrusion part 22a, and has a curved shape for gently guiding the film antenna parts 10A and 10B downward from the film antenna support part 25b. The hole 23b is a through hole for the male screw 20c formed in the cover main body 21b.

  The cable support portion 24b is provided on one side surface portion of the bottom case 20b and sandwiches and supports the cable 50 together with the cable support portion 24a. The film antenna support portion 25b is a flat surface portion disposed at a position corresponding to the adhesive member 40, and has a function of pressing the end portions 13A and 13B of the film antenna portions 10A and 10B against the adhesive member 40. That is, the end portions 13A and 13B of the film antenna portions 10A and 10B are sandwiched and fixed between the adhesive member 40 and the film antenna support portion 25b. The film antenna support portion 25b has flat surface portions 25d and 25e. The flat surface portion 25d is a flat surface portion to which the adhesive member 40 is bonded. The flat surface portion 25e is a flat surface portion to which the end portions 13A or 13B of the film antenna portions 10A and 10B are bonded, and presses the end portions 13A and 13B against the adhesive member 40.

  The concave portion 26b is a concave portion in which a convex portion of a solder portion 60 (described later) obtained by soldering the end portions 12A1 and 12B1 of the antenna elements 12A and 12B of the film antenna portions 10A and 10B to the circuit board portion 30 is accommodated.

  The circuit board part 30 is a circuit board electrically connected to the antenna elements 12A and 12B of the film antenna parts 10A and 10B, and amplifies the signals received by the film antenna parts 10A and 10B and outputs them to the cable 50. A substrate having an electronic circuit such as a circuit. The circuit board part 30 includes a board body 31, a hole part 32, an adhesive member mounting part 33, and an antenna element connection part 34.

  The substrate body 31 is a printed wiring board (PWB) having electronic circuit components and a line pattern. The hole 32 is a through-hole for the male screw 20 c formed in the substrate body 31. The adhesive member mounting portion 33 is a flat surface portion on which the adhesive member 40 is mounted by bonding. The adhesive member mounting portion 33 has flat surface portions 33a and 33b. The flat surface portion 33a is disposed at a position corresponding to the flat surface portion 25d to which the adhesive member 40 is bonded. The flat surface portion 33b is disposed at a position corresponding to the flat surface portion 25e, to which the adhesive member 40 is bonded. The antenna element connection part 34 has a conductive part connected to the circuit element of the board body 31, and the antenna elements 12A and 12B and the board are bonded by soldering the end parts 12A1 and 12B1 without bonding the adhesive member 40. The main body 31 is electrically connected.

  The adhesive member 40 is an adhesive member such as a double-sided tape that adheres the end portions of the film antenna portions 10 </ b> A and 10 </ b> B to the circuit board portion 30. The adhesive member 40 includes a film antenna adhesive portion 41 and a hole portion 42. The film antenna bonding portion 41 is a main body of the bonding member 40, and is an bonding member such as a double-sided tape in which an adhesive (adhesive) is applied to both surfaces of the base. This substrate is made of, for example, a nonwoven fabric with little difference in longitudinal and transverse strength. The thickness of the substrate is, for example, 0.1 to 0.15 [mm]. The adhesive member 40 has one adhesive surface bonded to the adhesive member mounting portion 33 and the other adhesive surface bonded to the end portions 13A and 13B of the film antenna portions 10A and 10B and the film antenna support portion 25b.

  The hole portion 42 is opened in the film antenna bonding portion 41 and is a hole for soldering the end portions 12A1 and 12B1 of the antenna elements 12A and 12B of the film antenna portions 10A and 10B to the antenna element connection portion 34 of the circuit board portion 30. Part. The hole portion 42 is disposed at a position corresponding to the antenna element connection portion 34. The adhesive member 40 is preferably not very elastic. Moreover, the adhesive force of the adhesive member 40 is, for example, 10 N / 20 mm or more.

  Next, with reference to FIG.4 and FIG.5, the manufacturing method of the film antenna apparatus 1 is demonstrated. FIG. 4 is a plan view of the circuit board unit 30 to which the film antenna units 10A and 10B are attached. FIG. 5 is a partial cross-sectional view of the film antenna device 1.

  As shown in FIG. 4, in the circuit board portion 30 in which the inner conductor and the outer conductor of the cable 50 are soldered and electrically connected, one adhesive surface of the adhesive member 40 is bonded to the adhesive member mounting portion 33. . The film antenna portions 10A and 10B are arranged so that the end portions 12A1 and 12B1 of the antenna elements 12A and 12B are positioned in the two hole portions 42, and the end portions 13A and 13B are bonded to the other side of the adhesive member 40. Glued to the surface. Then, the end portions 12A1 and 12B1 of the antenna elements 12A and 12B are soldered to the antenna element connection portion 34 through the hole portion 42, so that a convex solder portion 60 is formed.

  In the conventional film antenna apparatus, the contact terminal of the case portion and the terminal of the antenna element of the film antenna portion cannot be soldered. This is because the film is made of PET material and the antenna element is made of silver paste, so that the film melts when trying to solder the contact terminal of the case portion and the terminal of the antenna element. In the film antenna device 1, since the end portions 12A1 and 12B1 are not in contact with the films 11A and 11B, soldering is possible.

  And the solder part 60 is arrange | positioned at the recessed part 26b, and the edge parts 13A and 13B of film antenna part 10A, 10B are arrange | positioned at the film antenna guide part 22b and the film antenna support part 25b. Of the bonding member 40, the bonding surface 40a exposed at a position corresponding to the flat surface portion 33a is bonded to the flat surface portion 25d, and the bonding surfaces of the end portions 13A and 13B of the films 11A and 11B of the film antenna portions 10A and 10B are flat. By being bonded to the surface portion 25e and the film antenna guide portion 22b, the circuit board portion 30 to which the film antenna portions 10A and 10B are attached is bonded to the bottom case 20b.

  Then, the top case 20a is aligned with the bottom case 20b, and the male screw 20c is screwed into the female screw portion 23a via the holes 23b and 32. In response to this screwing, the film antenna portions 10A and 10B are soldered by the solder portion 60, bonded by the adhesive member 40, and pressed to the adhesive member 40 by the film antenna support portion 25b. It is strongly fixed to the case part 20. For this reason, the film antenna units 10A and 10B have a structure that does not come out of the circuit board unit 30 and the case unit 20 even when tensile mechanical stress is generated due to sticking, handling, or the like.

  And as shown in FIG. 5, the adhesive member 70 is affixed on the lower side of the cover main-body part 21b of the bottom case 20b. The adhesive member 70 is an adhesive member such as a double-sided tape.

  When the film antenna device 1 is attached to a window glass 80 of an automobile as an attachment object, the adhesive member 70 is adhered to the window glass 80, and the release films of the film antenna portions 10A and 10B are peeled off and the adhesion surface thereof. Is bonded to the window glass 80.

  The film antenna units 10A and 10B are guided to the window glass 80 side (lower side) by the film antenna guide unit 22b, and are further forcedly pushed down to the window glass 80 side by the projection 22a.

  As described above, according to the present embodiment, in the film antenna device 1, one adhesive surface of the adhesive member 40 is adhered to the circuit board portion 30, and the other adhesive surface is the end portion 13A of the film antenna portions 10A and 10B. 13B, the bottom case 20b is adhered to the adhesive surface of the film antenna portions 10A and 10B and the adhesive surface of the adhesive member 40 on the window glass 80 side, and the film antenna portions 10A and 10B are pressed against the adhesive member 40. It has the support part 25b. Therefore, the film antenna units 10A and 10B are strongly fixed to the circuit board unit 30 and the case unit 20 by adhesion by the adhesive member 40 and pressing by the film antenna support unit 25b, and the film antenna units 10A and 10B and the circuit board are fixed. An electrical connection failure with the unit 30 can be prevented. Furthermore, since the film antenna units 10A and 10B and the circuit board unit 30 can be integrated, and there is no need to carefully match the feeding portions of the film antenna units 10A and 10B, the film antenna device 1 is attached to the window glass 80. Easy to install.

  The film antenna support portion 25b of the bottom case 20b is bonded to the bonding surface of the film antenna units 10A and 10B with the flat surface portion 25e, and is bonded to the bonding surface of the bonding member 40 on the window glass 80 side with the flat surface portion 25d. For this reason, the film antenna portions 10A and 10B can be strongly fixed to the bottom case 20b and the adhesive member 40.

  The bottom case 20b has a film antenna guide portion 22b for guiding the film antenna portions 10A and 10B to the window glass 80 side. For this reason, the film antenna portions 10A and 10B can be easily guided to the window glass 80 side, and the film antenna portions 10A and 10B can be prevented from floating from the window glass 80 to prevent dust and the like from accumulating therebetween. The film antenna portions 10A and 10B can be prevented from being peeled from the window glass 80.

  Moreover, the top case 20a has a protrusion 22a that pushes down the film antenna portions 10A and 10B toward the window glass 80. For this reason, the film antenna portions 10A and 10B can be easily pushed down to the window glass 80 side, and the film antenna portions 10A and 10B are lifted from the window glass 80 to prevent dust and the like from accumulating therebetween. It is possible to prevent the film antenna portions 10A and 10B from being peeled from the window glass 80.

  The antenna elements 12A and 12B have end portions 12A1 and 12B1 that are not in contact with the films 11A and 11B, and the end portions 12A1 and 12B1 and the antenna element connection portion 34 of the circuit board portion 30 are electrically connected by soldering. It is connected to the. For this reason, it is possible to further prevent poor electrical connection between the film antenna units 10A and 10B and the circuit board unit 30.

  The antenna elements 12A and 12B are copper wires. Therefore, the end portions 12A1 and 12B1 that are not in contact with the antenna elements 12A and 12B films 11A and 11B can be easily exposed and soldered.

  Further, the bottom case 20b has a recess 26b in which the solder part 60 is received. For this reason, the circuit board part 30 to which the film antenna parts 10A and 10B are soldered can be strongly bonded to the film antenna support part 25b of the case part 20.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and can be changed without departing from the gist thereof.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Film antenna apparatus 10A, 10B Film antenna part 11A, 11B Film 12A, 12B Antenna element 12A1, 12B1 End part 13A, 13B End part 20 Case part 20a Top case 21a Cover main-body part 22a Projection part 23a Female screw part 24a Cable support part 25a Rib 20b Bottom case 21b Cover body portion 22b Film antenna guide portion 23b Hole portion 24b Cable support portion 25b Film antenna support portions 25d, 25e Flat surface portion 26b Recess 20c Male screw 30 Circuit board portion 31 Board body 32 Hole portion 33 Adhesive member mounting Parts 33a, 33b Flat surface part 34 Antenna element connection part 40 Adhesive member 40a Adhesive surface 41 Film antenna adhesive part 42 Hole part 50 Cable 51 Connector 60A, 60B Pull tab 70 Adhesive member 80 Window glass

Claims (7)

A film antenna device to be attached to an attachment object,
A film antenna portion having a film having an adhesive surface on one side and an antenna element formed on the film;
A circuit board portion electrically connected to the antenna element of the film antenna portion;
An adhesive member having first and second adhesive surfaces, wherein the first adhesive surface is adhered to the circuit board portion, and the second adhesive surface is adhered to an end portion of the film antenna portion;
A case portion for storing the circuit board portion, the adhesive member, and an end portion of the film antenna portion;
The case portion is
A top case,
A bottom case adapted to the top case, and
The bottom case is
Have a film antenna support portion,
The film antenna support is
A film antenna device comprising a flat surface portion that presses the film antenna portion against the adhesive member . 2. The film antenna device according to claim 1, wherein the film antenna support portion of the bottom case is bonded to an adhesive surface at an end of the film antenna portion and a second adhesive surface of the adhesive member.   The film antenna device according to claim 1, wherein the bottom case includes a film antenna guide portion that guides the film antenna portion toward the attachment object.   4. The film antenna device according to claim 1, wherein the top case has a protrusion that pushes down the film antenna unit toward the attachment object. 5. The antenna element has an end not in contact with the film,
The circuit board portion has an antenna element connection portion to which the antenna element is electrically connected without being bonded to the adhesive member,
The film antenna device according to any one of claims 1 to 4, wherein an end portion of the antenna element and the antenna element connection portion are electrically connected by soldering.   The film antenna device according to claim 5, wherein the antenna element is a metal wire.   The film antenna device according to claim 5, wherein the bottom case has a concave portion in which a solder portion formed by the soldering is received.

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