JP2008263537A - Circuit module for glass antenna and assembly method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit module for a glass antenna and an assembly method thereof by which area of an electrode on the side of the circuit module is changed and which is easily attached/detached for replacement of circuit boards in the circuit module for the glass antenna of the glass antenna for bipolars. <P>SOLUTION: In the circuit module 10 for the glass antenna, a circuit board 60 is supported and fixed to a chassis 40 and the chassis 40 is arranged so as to contact a base plate 30 on the ground side. A module main body 140 constituted by storing the circuit board 60 in the chassis 40 is joined to the base plate 30 on the ground side and a base plate 20 on the power supply side by a screw 82 and a case 90 is attached to the chassis 40 by an engagement means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a circuit module for a glass antenna provided with a power supply side base plate and a ground side base plate provided on a window glass plate so as to face an electrode of a bipolar antenna provided on the window glass plate, and an assembling method thereof.

  2. Description of the Related Art Conventionally, vehicle glass antennas that include an antenna element and an antenna electrode on an automotive window glass plate such as a vehicle windshield and rear glass are known. As the antenna element, for example, a bipolar antenna element is used. In this vehicle glass antenna, a circuit module is provided on a window glass plate. Since this circuit module is attached to a vehicle window glass plate that is rarely replaced, it is necessary that the circuit module can be easily removed without replacing the window glass plate.

  In addition, automobile window glass plates such as vehicle windshields and rear windows are laminated window glasses in order to minimize damage when the glass breaks. In this case, from the viewpoint of durability of the antenna, the antenna element is usually provided on the mating surface side of the laminated window glass plate. On the other hand, the circuit module cannot be provided on the mating surface side of the laminated window glass plate because it needs to be replaced, and is provided on the outer surface of the laminated window glass plate, for example, the inner surface of the vehicle. Signal transmission between the circuit module and the antenna element is performed by at least one of electromagnetic coupling and capacitive coupling between electrodes sandwiching the window glass plate. For this reason, in order to perform signal transmission appropriately, it is necessary to adjust and change the electrode area.

Patent Document 1 below describes a circuit module for a vehicle glass antenna. In this circuit module, as shown in FIG. 2, a circuit board is accommodated in a ceramic box part 201, and signal terminals 202 and 203 are connected to the circuit board. On the other hand, the leg portions 204a and 204b that hold the box portion 201 are connected to a conductor layer provided on the surface of the window glass plate by soldering or the like, and are joined to the window glass plate.
With the above configuration, the circuit module can easily transmit a signal from the feeding point of the antenna element to the circuit board, and by providing it on the window glass plate, it is easily compact even if the circuit including the antenna is complicated. It is said that it can be made.

  The following Patent Document 2 describes an in-vehicle antenna device. In an in-vehicle antenna device, a patch-like antenna conductor provided on one surface of a window glass plate and a ground conductor of an electric circuit provided on the other surface of the glass plate so as to face the antenna conductor. Have. The electric circuit is provided with a base plate, and the base plate is bonded and fixed to the window glass plate with an adhesive such as a humidity curable resin. With this configuration, it is said that the in-vehicle antenna device having a high radiation gain can be reduced in size.

Japanese Patent Laid-Open No. 10-093318 JP 2006-13959 A

However, the circuit module described in Patent Document 1 has a problem that it is difficult to change the electrode area to a predetermined size because of transmission by at least one of the above-described electromagnetic coupling and capacitive coupling.
Further, since the leg portions 204a and 204b are joined to the window glass plate by soldering or the like through the conductor layer to fix the box portion 201 on the window glass plate, the leg portions 204a and 204b are replaced when the circuit components are replaced. It is necessary to remove the joint portion from the conductor layer provided on the window glass plate. At this time, since the conductor layer on the window glass plate is partially peeled off from the window glass plate and damaged, when the circuit module is re-joined and fixed to the window glass plate, the window glass plate is used for re-forming the damaged conductor layer. The troublesome work to remove from the vehicle is required.

  On the other hand, the vehicle-mounted antenna device described in Patent Document 2 is not limited to the antenna structure of a bipolar antenna because it is limited to a patch-like antenna element and has a base plate as an electrode.

  Therefore, in order to solve the above problems, the present invention provides a glass antenna circuit module provided with a power supply side base plate and a ground side base plate, which is provided on the window glass plate with respect to the bipolar antenna provided on the window glass plate. An electrode module on the circuit module side can be changed, and a glass antenna circuit module configured to be easily detachable for replacement of a circuit board is provided, and a method for assembling the circuit module is provided. For the purpose.

  The present invention includes a power supply side base plate and a ground side base plate provided on opposite surfaces of two electrodes of a bipolar antenna provided on one side of a window glass plate of an automobile with the window glass plate interposed therebetween. A power supply side base plate and a ground side base plate joined to the window glass plate so as to face two electrodes of the antenna, an antenna peripheral circuit for processing a signal from the bipolar antenna, and A circuit board connected to the coaxial cable, a chassis having a storage space for supporting and storing the circuit board, and a case covering the storage space of the chassis, the circuit board being stored in the chassis The module body is configured by storing in the space, and the chassis is the window glass plate as seen from the ground side base plate joined to the window glass plate The power supply side terminal of the module body is joined to the power supply side base plate and the ground side terminal of the module body is joined to the ground side base plate by mechanical means. The glass antenna circuit module is characterized in that the case is attached to the chassis by a locking means.

At that time, a plurality of bulging portions that bulge toward the window glass plate side are provided at a joint portion of the power supply side base plate with the window glass plate, and further, the window glass plate of the power supply side base plate and On the surface opposite to the joint portion, there is a step portion in which a part of the power supply side base plate protrudes to the opposite side in a shelf shape, and a screw hole for joining to the chassis is provided in the step portion. ,
The joint portion of the ground side base plate with the window glass plate is provided with a protruding portion projecting toward the window glass plate side, and further, on the surface of the ground side base plate opposite to the joint portion, It is preferable that a part of the ground side base plate protrudes to the opposite side in a shelf shape, and a screw hole for joining to the chassis is provided in the step part.

  Further, the storage space of the chassis is formed by a bottom portion on a plane and a wall surface standing from a part of an edge portion of the plane, and a surface of the bottom portion of the chassis in the storage space is provided with the ground side base plate. There is a stepped portion protruding from the bottom surface into the storage space so as to correspond to the stepped portion, a through hole penetrating the bottom of the chassis is provided in the stepped portion, and the wall surface of the chassis It is preferable that a locking hole for locking the case is provided.

  The peripheral circuit of the antenna is an amplifier circuit, and the circuit board is supported by a projecting portion projecting into a storage space provided on the wall surface of the chassis, and a peripheral edge is formed at the end of the wall surface. The claw part extending in the direction is bent toward the storage space, and the supported circuit board is pressed by the claw part on the surface of the circuit board opposite to the bottom of the chassis. The circuit board is preferably supported and fixed in the storage space.

Furthermore, the module main body, in addition to the chassis having the storage space,
A metal plate that is electrically connected to an input end of an amplifier circuit provided on the circuit board and extends outward from a storage space of the chassis, and an end of the metal plate located on the opposite side of the storage space; The region is preferably joined to the power supply side base plate. The case is preferably provided with a locking claw that engages with a locking hole of the chassis.

  In addition to the chassis having the housing space, the module body is electrically connected to an input end of an amplifier circuit provided on the circuit board, and a metal plate extending outside the housing space of the chassis is used as a module. Provided as a power supply side terminal of the main body, a through hole is provided in an end or a region of the metal plate located on the side opposite to the storage space, and a screw passing through the through hole is provided as the screw of the power supply side base plate. The module main body and the power supply side base plate are joined by screwing with a hole, and further, the bottom of the chassis in the storage space corresponds to the step portion of the ground side base plate from the surface of the bottom to the storage space. A stepped part protruding in a shelf shape is provided as a ground side terminal of the module body, and the stepped part is provided with a through-hole penetrating the bottom of the chassis. It is preferable that the chassis and the ground-side base plate is joined by screwing in 該螺 child hole of the ground-side base plate a screw passing through the through hole.

  Furthermore, the present invention is a method for assembling a circuit module for a glass antenna, in which a circuit module having a power supply side base plate and a ground side base plate is provided on a window glass plate of an automobile, wherein the power supply side base plate and the ground side base plate are connected to antenna electrodes. Two conductors provided on the window glass plate by soldering the power supply side base plate and the ground side base plate after bonding the power supply side base plate and the ground side base plate to each other. Connecting the power supply side base plate and the earth side base plate to the window glass plate by connecting to each of the layers, and the module main body housing the circuit board in the chassis on the power supply side base plate and earth side base plate joined to the window glass plate. Contact A step of, providing a method of assembling a circuit module for a glass antenna having.

  When assembling the glass antenna circuit module, it is preferable to bond the ground side base plate to the window glass plate using a double-sided tape and an adhesive. Furthermore, it is preferable that the ground side base plate is bonded to the window glass plate using a double-sided tape and an adhesive, and then connected to a metal layer provided on the window glass plate by soldering.

In the present invention, the module main body in which the circuit board is housed in the chassis is joined to the ground side base plate and the power feeding side base plate joined to the window glass plate by mechanical means, and the case is attached to the chassis by the locking means. Therefore, the module main body can be easily detached from the ground side base plate and the power supply side base plate joined to the window glass plate, and can be easily detached for replacement of the circuit board.
In addition, since the ground side base plate and the power supply side base plate are joined to the module body by mechanical means, depending on the size of the antenna side electrode and the thickness of the glass plate, the ground side base plate and the power supply side base plate The size can be set freely. Further, when a laminated glass plate is used for a window glass plate of a vehicle, the circuit module is provided on the inner side of the vehicle, which is convenient for mounting and can reduce the space.

Hereinafter, the circuit module for glass antenna of the present invention will be described in detail based on embodiments shown in the accompanying drawings.
FIG. 1 is an exploded perspective view showing a circuit module 10 which is an embodiment of the circuit module for glass antenna of the present invention. The circuit module 10 shown in FIG. 1 includes a power supply side base plate 20 and a ground side base plate 30. The laminated window glass plate is formed by bonding two glass plates, an inner glass plate 6a and an outer glass plate 6b (see FIG. 3A), with an intermediate film 2 made of synthetic resin such as polyvinyl butyral. Configured.
In the example shown in FIG. 1, the power supply side base plate 20 and the ground side base plate 30 are antenna element side power supply electrodes (hereinafter referred to as power supply electrodes) of the antenna element 4 provided between the intermediate film 2 and the vehicle interior glass plate 6a. ) 4a and antenna element side ground electrode (hereinafter referred to as ground electrode) 4b, respectively, are provided on the vehicle inner surface of the vehicle inner side glass plate 6a.
The circuit module 10 mainly includes a power supply side base plate 20, a ground side base plate 30, a chassis 40, a circuit board 60, a metal plate 70, and a case 90. The module main body 140 according to the present invention includes the chassis 40, the circuit board 60, and the metal plate 70.

  FIG. 3A is a diagram schematically illustrating a cross section of the power supply side base plate 20 and the ground side base plate 30 joined to the vehicle interior glass plate (hereinafter referred to as a glass plate) 6a, and FIG. It is the figure which looked at the side base plate 20 and the earth | ground side base plate 30 from upper direction. FIG. 4 is a perspective view of the circuit module 10 shown in FIG.

  The circuit module 10 is provided on the glass surface inside the glass plate 6 a of the laminated window glass plate 6. A feeding electrode 4a and a ground electrode 4b of the antenna element 4 are provided on the surface side of the intermediate film 2 of the glass plate 6a, and the feeding electrode 4a and the ground electrode 4b are provided on the glass surface opposite to the feeding electrode 4a and the ground electrode 4b. A power supply side base plate 20 and a ground side base plate 30 are provided so as to face each other. The circuit module 10 is suitably used as an antenna circuit module that receives radio waves in a 470 to 770 MHz band (terrestrial digital television broadcast band), for example, but the frequency band is not particularly limited in the present invention.

The power supply side base plate 20 is a component that functions as a power supply side plate of the circuit module 10 by being joined to the glass plate 6 a so as to face the power supply electrode 4 a on the power supply side of the antenna element 4 with the glass plate 6 a interposed therebetween. The ground side base plate 30 is a component that functions as a ground side plate of the circuit module 10 by being joined to the glass plate 6 a so as to face the ground electrode 4 b of the antenna element 4 with the glass plate 6 a interposed therebetween.
Further, conductor layers 8a and 8b made of silver paste are provided on the surface of the glass plate 6a where the power supply side base plate 20 and the ground side base plate 30 are joined to the glass plate 6a.
The feeding electrode 4a and the ground electrode 4b of the antenna element 4 and the conductor layers 8a and 8b provided on the circuit module 10 side are provided so as to face each other with the glass plate 6a interposed therebetween. Are connected by at least one of electromagnetic coupling and capacitive coupling. That is, the reception signal excited by the antenna element 4 is transmitted to the electrode 4a, and the reception signal is transmitted to the conductor layer 8a by at least one of electromagnetic coupling and capacitive coupling between the feeding electrode 4a and the conductor layer 8a. The received signal is amplified by the circuit board 60. That is, the conductor layer 8a is a power supply side counter electrode facing the power supply electrode 4a, and the conductor layer 8b is a ground side counter electrode facing the ground electrode 4b.
As shown in FIG. 3A, the feeding electrode 4a and the ground electrode 4b on the antenna element 4 side are made of a conductive metal foil such as a copper foil, and are attached to the glass plate 6a via the adhesive layers 4c and 4d. It is joined. Moreover, the circuit module for glass antennas of the present invention may use a single plate glass such as tempered glass in addition to the above laminated glass. In this case, the glass antenna circuit module may be bonded and soldered on a conductive layer in which the antenna element and the feeding electrode are formed of silver paste on the single plate glass surface.

The circuit board 60 is a board provided with an amplifier circuit (shaded portion in FIG. 1) for amplifying a signal received by the antenna element 4, and the amplified signal is transmitted to a receiver (not shown) via the coaxial cable 84. The The amplifier circuit is an antenna peripheral circuit that processes a received signal.
The chassis 40 is a component having a storage space for supporting and storing the circuit board 60. The case 90 is a component that covers the storage space of the chassis 40 that stores the circuit board 60.
The circuit board 60 is supported and fixed to the chassis 40. The module main body 140 (see FIG. 1) in which the circuit board 60 is housed in the chassis 40 and the metal plate 70 is further provided is a screw 82 with respect to the power supply side base plate 20 and the ground side base plate 30 joined to the glass plate 6a. Are joined mechanically. The case 90 is attached to the chassis 40 by engaging a locking hole 48 (see FIG. 6A) and a locking claw 92 (see FIG. 8).

Hereinafter, the configuration of each component will be described more specifically.
The glass plate 6a to which the circuit module 10 is bonded is an in-vehicle glass plate of the laminated window glass plate 6 bonded with the intermediate film 2 having a thickness of 0.3 to 1.2 mm interposed therebetween. Between the interlayer film 2 of the laminated window glass plate 6 and the glass plate 6a, an antenna element 4 made of, for example, copper foil, a feeding electrode 4a, and a ground electrode 4b are provided. A concealing layer 7 such as a black ceramic layer is provided on the surface of the vehicle interior side glass plate 6a near the periphery of the vehicle interior side glass plate 6a.
As shown in FIG. 1, a silver paste is formed on a part of the concealing layer 7 provided on the edge of the glass plate 6a at a position facing the rectangular feeding electrode 4a and the ground electrode 4b on the antenna element 4 side. The rectangular conductor layers 8a and 8b thus formed are provided separately. The conductor layers 8a and 8b function as a power supply side counter electrode and a ground side counter electrode on the circuit module 10 side, respectively.

The power supply side base plate 20 is joined to the conductor layer 8a provided on the glass plate 6a by solder 110a (see FIG. 3A). As shown in FIG. 5, three bulging portions 22 that bulge toward the glass plate 6 a are provided at the joint portion of the power supply side base plate 20 with the glass plate 6 a. These bulges 22 function as a solder pool gap between the conductor layer 8a on the glass plate 6a and the power supply side base plate 20 so that the solder 110a has a predetermined thickness.
FIG. 5 is a perspective view of the power supply side base plate 20 and the ground side base plate 30.

Further, on the surface of the power supply side base plate 20 on the side opposite to the joining portion with the glass plate 6a, as shown in FIG. 5, there is a step portion 24 in which a part of the plate 20 protrudes in a shelf shape to form a step. The stepped portion 24 is provided with a screw hole 26 for joining with the module main body 140. The screw hole 26 is used for screwing a screw 82 passing through a through hole of a metal plate 70 extending from a circuit board 60 described later.
The material in particular of the electric power feeding side base plate 20 is not restrict | limited, For example, a galvanized steel plate is used. The power supply side base plate 20 is connected to the conductor layer 8a. In order to efficiently transmit a signal from the feeding electrode 4a of the antenna element 4, the area of the conductor layer 8a and the feeding electrode 4a is preferably 49 to 2500 mm ² .

The ground side base plate 30 is joined to the conductor layer 8b provided on the glass plate 6a by solder 110b (see FIG. 3B). A protruding portion 32 (see FIG. 5) that protrudes toward the glass plate in order to come into contact with the glass plate 6a is provided at a bonding portion of the ground side base plate 30 that is bonded to the glass plate 6a. This protrusion 32 is connected to the conductor layer 8b provided on the glass plate 6a.
The shape of the protrusion 32 is a square or a substantially square. The projecting portion 32 has three sides of a square or a substantially square separated from the plate of the ground side base plate 30 and separated from the plate, and the other side is connected to the ground side base plate 30. The connected portion is bent toward the glass plate 6a to form the protruding portion 32.
Further, on the surface of the ground side base plate 30 opposite to the joint portion with the glass plate 6a, there are stepped portions 34 and 35 in which a part of the ground side base plate 30 protrudes to the chassis 40 side in a shelf shape. The stepped portions 34 and 35 are provided with screw holes 36 and 37 for joining to the chassis 40. The screw holes 36 and 37 are used for screwing a screw 82 passing through through holes 46 and 47 (see FIG. 6) provided in the chassis 40 described later. The material of the ground side base plate 30 is not particularly limited as in the case of the power supply side base plate 20, and for example, a galvanized steel plate is used.

  Furthermore, a total of four bulging portions 38 that bulge toward the glass plate 6a are provided on the side of the ground side base plate 30 that is joined to the glass plate 6a, and the adhesive layer and the solder layer have a predetermined thickness. A gap is formed between the surface of the glass plate 6 a and the ground-side base plate 30 so as to have In particular, the bulging portion 38 provided in the protruding portion 32 creates a solder pool gap between the conductor film 8a on the glass plate 6a and the ground side base plate 30, so that the solder 110b has a predetermined thickness. Function.

The ground-side base plate 30 is connected to the conductor layer 8b formed from the silver paste provided on the glass plate 6a by the solder 110b and joined to the glass plate 6a. Before the connection by the solder 110b, the double-sided tape and It joins to the glass plate 6a using an adhesive agent. For example, as shown in FIG. 10, it is joined to the glass plate 6a at two locations using U-shaped double-sided tapes 120a, 120b and adhesives 122a, 122b applied to the area inside the U-shape. . First, after temporarily fixing to the glass plate 6a with the double-sided tapes 120a and 120b, the applied adhesives 122a and 122b are cured and firmly bonded to the glass plate 6a. The double-sided tapes 120a and 120b are temporary fixing means until the adhesives 122a and 122b are cured. As the adhesives 122a and 122b, for example, a humidity curable urethane adhesive, a two-component urethane adhesive, or the like is used. The three bulging portions 38 excluding the bulging portion 38 of the protrusion 32 described above create a gap for an adhesive reservoir between the ground side base plate 30 and the glass plate 6a, and the adhesives 122a and 122b have a predetermined thickness. To function.
In the present embodiment, the antenna element 4, the feeding electrode 4a, and the ground electrode 4b are provided on the inner surface of the intermediate film 2, but may be provided on the opposite surface of the intermediate film 2 from the inner side. .

The chassis 40 has a storage space 43 formed by a bottom 41 on a plane and a wall 42 standing from the edge of the plane. FIG. 6 is a perspective view of the chassis 40. On the surface of the bottom 41 in the storage space 43 of the chassis 40, two stepped portions protruding from the surface of the bottom 41 into the storage space 43 so as to correspond to the stepped portions 34 and 35 of the ground side base plate 30. 44, 45 are provided. As shown in FIG. 6, the stepped portions 44 and 45 are provided with through holes 46 and 47 that penetrate the chassis 40. The chassis 40 is configured to be joined to the ground side base plate 30 by screwing into the through holes 46 and 47 through the screws 82 and screw holes 36 and 37 provided in the ground side base plate 30. That is, the step portions 44 and 45 function as the ground side terminal of the module main body 140.
Further, the wall surface 42 of the chassis 40 is provided with two locking holes 48 for locking a case 90 described later. The material of the chassis 40 is not particularly limited, and is made of, for example, a tinned steel plate.

  As shown in FIG. 6, projecting portions 51 that project into the storage space 43 are provided at four positions on the edge of the wall surface 42 of the chassis 40 on the wall surface 42 in the storage space 43 of the chassis 40. The projecting portion 51 is provided with a pair of parallel cuts at different heights of the wall surface 42, and is formed by bending the wall surface portion between the cuts into a U-shape on the storage space side while extending by pressing. It is done. These projecting portions 51 support the circuit board 60 from below. Further, two claws 52 extending in the circumferential direction from the end of the wall surface 42 are provided to fix the supported circuit board 60. The circuit board 60 is fixed so as not to move by bending the claw 52 in the inner direction of the storage space 43 (arrow direction D in FIG. 6). That is, the claw 52 is fixed by pressing the surface of the circuit board 60 opposite to the bottom 41 of the chassis 40 by bending the claw 52 to the inside of the storage space 43. For this reason, the position in the height direction of the wall surface on which the claw 52 is provided is set according to the thickness of the circuit board 60. The bent claws 52 are connected to the ground end (not shown) of the amplifier circuit provided on the circuit board 60 by soldering, so that the chassis 40 has the same potential as the ground.

  FIG. 7 is a perspective view showing a state in which the module main body 140 in which the circuit board 60 is housed in the chassis 40 is joined to the power supply side base plate 20 and the ground side base plate 30 with screws 82. The module main body 140 is provided with a metal plate 70 extending outward from the storage space 43 of the chassis 40. As shown in FIG. 1, one end of the metal plate 70 is bent, and the bent portion penetrates two through-holes provided in the circuit board 60 from the lower side in FIG. It reaches the upper substrate surface, and is electrically connected to the input end 62 of the amplifier circuit on this substrate surface. As shown in FIG. 1, a through-hole 72 through which a screw 82 is passed to join the power supply side base plate 20 is provided in the end opposite to the input end 62 or in the region opposite to the input end 62 of the metal plate 70. The module main body 140 is configured to be joined to the power supply side base plate 20 as shown in FIG. 7 by screwing into the through holes 72 through the screws 82 and screw holes 26 provided in the power supply side base plate 20. The That is, the metal plate 70 functions as a power supply side terminal of the module body 140. The material in particular of the metal plate 70 is not restrict | limited, For example, it is made from a tin plating steel plate.

As shown in FIG. 7, a coaxial cable 84 (see FIG. 1) transmits a signal from the circuit module 10 to a receiver (not shown) at the end of the chassis 40 opposite to the side on which the metal plate 70 is provided or in an area on the opposite side. ) Is provided in the cutout portion.
The circuit board 60 is provided with an amplifier circuit (a hatched portion in FIG. 1) for amplifying a reception signal on the board. The circuit board 60 has notches 64 and 66 (see FIG. 1) in order to secure a space for fastening the screw 82 with a tool to join the chassis 40 and the ground side base plate 30 together.

  The joining by the screw 82 sandwiches a spring washer, and the screw 82 passed through the through holes 46 and 47 of the chassis 40 is screwed into the screw holes 36 and 37 of the ground side base plate 30 to be screwed. 30 and the module main body 140 are joined. Further, the metal plate extending from the housing space 43 of the chassis 40 by screwing the screw 82 passing through the through hole 72 of the metal plate 70 with the screw hole 26 of the power supply side base plate 20 with the spring washer interposed therebetween. 70 and the power supply side base plate 20 are joined. Thereby, the power supply side base plate 20 and the module main body 140 are joined.

The case 90 covers the storage space 43 of the chassis 40 that supports and fixes the circuit board 60 from above in FIG. As shown in FIG. 8, the case 90 is provided with two locking claws 92 so as to engage with the locking holes 48 (see FIG. 6) provided in the chassis 40.
The case 90 is provided with a ceiling portion 96 that covers the storage space 43 from above in FIG. 1 and a wall portion 98 that extends downward from the edge of the ceiling portion 96 in FIG. 1 (extends upward in FIG. 7). . The wall 98 is provided with two parallel cuts in a direction perpendicular to the surface of the ceiling 96. A locking claw 92 is provided between the parallel cuts so as to protrude inward from the inner surface of the wall portion 98. Therefore, when the storage space 43 of the chassis 40 is covered from above in FIG. 1, the locking claw 92 pushes the wall surface of the outer wall of the chassis 40 inward while sliding the outer wall of the chassis 40. Is engaged with the locking hole 48 of the chassis 40, the force is locked to the locking hole 48 by this force. Moreover, since the operator feels a click when locking, the case 90 can be securely attached to the chassis 40.
The material of the case 90 is, for example, a thermoplastic resin such as polyethylene terephthalate, but is not particularly limited as long as it is an insulating material in the present invention.

Thus, since the circuit module 10 includes the power supply side base plate 20 and the ground side base plate 30, it can be suitably used for a bipolar antenna circuit module. In particular, when used for a laminated window glass plate, the circuit module 10 can be provided on the inner surface of the inner glass plate 6a, so that space can be saved for convenience in mounting. Further, since the electrode area of the power supply side base plate 20 and the electrode area of the ground side base plate 30 can be set according to the electrodes of the antenna element, a module that is easy to manufacture and has high transmission efficiency can be realized.
The module main body 140 in which the circuit board 60 is housed in the chassis 40 is joined to the power supply side base plate 20 and the ground side base plate 30 joined to the glass plate 6a by screwing, so that the module in which the circuit board 60 is housed in the chassis 40. The main body 140 can be removed without having to remove the power supply side base plate 20 and the ground side base plate 30 from the glass plate 6a. That is, in order to replace the circuit board 60, the module main body 140 in which the circuit board 60 is housed in the chassis 40 can be easily detached from the power supply side base plate 20 and the ground side base plate 30.

(Example)
A glass antenna circuit module having the specifications such as dimensions of the circuit module 10 as shown in the following table was manufactured. Dimensions L _{1 to} L _{6 of} the power supply side base plate 20 and the ground side base plate 30 defined in FIGS. 9A and 9B, dimensions L _{7 to} L ₉ defined in FIG. 8 and the rectangular shape of the power supply electrode 4a on the antenna element 4 side. The following table shows the dimensions (vertical length × horizontal length) and the rectangular dimensions (vertical length × horizontal length) of the conductor layer 8a connected to the power supply side base plate 20. L ₁ is a distance between both ends of the power supply side base plate 20 and the ground side base plate 30 when arranged in the circuit module 10. The antenna element 4, the feeding electrode 4a, and the ground electrode 4b were made of copper foil, and the conductor layer 8a was printed with a silver paste. The positions of the adhesive and the solder on the power supply side base plate 20 and the ground side base plate 30 were the positions shown in FIG.

The gain of the antenna using the circuit module 10 having the above specifications was examined.
When the conductor layer (counter electrode) 8a is accurately arranged at the position facing the power supply electrode 4a (the center position of the rectangular shape of the power supply electrode 4a matches the center position of the rectangular shape of the conductor layer 8a), therefore, the power supply side When each connection of the base plate 20 and the ground side base plate 30 is performed as intended, the capacitance is 15.8 pF. At this time, an area (referred to as a lap area) where the feeding electrode 4a and the conductor layer 8a overlap each other is 500 mm ² (= 20 mm × 25 mm).
On the other hand, when the position of the conductor layer 8a is shifted by 4 mm in the vertical direction and the horizontal direction with respect to the feeding electrode 4a, the lap area is 414 mm ² (= 18 mm × 23 mm). The capacitance at this time is 13.2 pF. FIG. 11 is a diagram showing the relationship between the lap area between the electrodes facing each other across the glass plate 6a and the gain of the antenna when the circuit module 10 is used. The data is data having a frequency of 470 to 770 MHz. Here, the gain is an average value of gains in the frequency band 470 to 770 MHz. According to this, it shifted 4mm in vertical and horizontal directions as described above, gain when a lap area 414 mm ^2, the gain is substantially unchanged when the lap area arranged as targeted is 500 mm ² I understand that I do not. From this, it can be seen that when the antenna element 4 and the circuit module 10 are used, the gain is unlikely to decrease even if a positional deviation occurs between the electrodes.
As described above, when the circuit module for glass antenna of the present invention is combined with a bipolar antenna, the gain does not change with respect to the positional deviation of the electrodes, and the transmission efficiency is maintained.

  As mentioned above, although the circuit module for glass antennas of this invention and its assembly method were demonstrated, this invention is not limited to the said embodiment, You may make various improvement and a change in the range which does not deviate from the main point of this invention. Of course.

It is a disassembled perspective view which shows the circuit module which is one form of the circuit module for glass antennas of this invention. It is a perspective view of the circuit module for vehicle glass antennas which is a prior art. (A) is a figure which illustrates typically the cross section of the electric power feeding side base plate and earth | ground side base plate which were joined to the glass plate, (b) is the figure which looked at the electric power feeding side base plate and the earthing side base plate from the upper direction. It is a perspective view which shows the state which mounted the circuit module shown in FIG. 1 on the glass surface. It is a perspective view of the electric power feeding side base plate and earth | ground side base plate which are components of the circuit module shown in FIG. It is a perspective view of the chassis which is a component of the circuit module shown in FIG. It is a perspective view of the chassis which accommodated the circuit board shown in FIG. It is a perspective view of the case which is a component of the circuit module shown in FIG. (A), a diagram showing a (b), each dimension of the feeding-side base plate and a ground-side base plate L ₁ ~L _6. It is a figure which shows the position of the adhesive agent and solder of the electric power feeding side base plate and earth | ground side base plate before joining of the circuit module shown in FIG. It is a figure which shows the relationship between the wrap area of the electrode which mutually opposes on both sides of the glass shown in FIG. 1, and antenna gain.

Explanation of symbols

2 Intermediate film 4 Antenna element 4a Feed electrode 4b Ground electrode 4c, 4d Adhesion layer 6 Laminated window glass plate 6a Car interior glass plate 6b Car exterior glass plate 7 Concealing layers 8a, 8b Conductive layer 10 Circuit module 20 for glass antenna Power feed base plate 22, 38 Swelling portion 24, 34, 35, 44, 45 Stepped portion 26, 36, 37 Screw hole 30 Ground side base plate 32 Projection portion 40 Chassis 41 Bottom portion 42 Wall surface 43 Storage space 46, 47, 72, 94 Through hole 48 Locking hole 51 Projecting portion 52 Claw 60 Circuit board 70 Metal plate 80 Connector 82 Screw 90 Case 92 Locking claw 96 Ceiling 98 Wall 110a, 110b Solder 120a, 120b Double-sided tape 122a, 122b Adhesive 140 Module body

Claims (9)

A circuit module having a power supply side base plate and a ground side base plate provided on the opposite side of the two windows of a bipolar antenna provided on one side of a window glass plate of an automobile with the window glass plate interposed therebetween. There,
A power supply side base plate and a ground side base plate joined to the window glass plate so as to face the two electrodes of the antenna;
A circuit board having an antenna peripheral circuit for processing a signal from a bipolar antenna and connected to a coaxial cable;
A chassis having a storage space for supporting and fixing the circuit board;
A case covering the storage space of the chassis; and a module body is configured by storing the circuit board in the storage space of the chassis,
The chassis is arranged on the side opposite to the window glass plate as viewed from the ground side base plate joined to the window glass plate so as to contact the ground side base plate, and the power supply side terminal of the module body is the power supply side base plate. In addition, the earth terminal of the module body is joined to the earth base plate by mechanical means,
A circuit module for a glass antenna, wherein the case is attached to the chassis by a locking means. A joint portion of the power supply side base plate with the window glass plate is provided with a plurality of bulging portions that bulge toward the window glass plate side, and a joint portion of the power supply side base plate with the window glass plate. On the opposite side surface, there is a step portion in which a part of the power supply side base plate protrudes to the opposite side in a shelf shape, and the step portion is provided with a screw hole for joining to the chassis,
The joint portion of the ground side base plate with the window glass plate is provided with a protruding portion projecting toward the window glass plate side, and further, on the surface of the ground side base plate opposite to the joint portion, The glass antenna circuit according to claim 1, wherein a part of the ground side base plate has a stepped portion protruding in a shelf shape to the opposite side, and a screw hole for joining to the chassis is provided in the stepped portion. module. The storage space of the chassis is formed by a bottom portion on a plane and a wall surface standing from a part of an edge portion of the plane,
The bottom surface of the chassis in the storage space has a stepped portion protruding from the bottom surface into the storage space so as to correspond to the stepped portion of the ground side base plate. A through hole is provided through the bottom,
Furthermore, the circuit module for glass antennas of Claim 1 or 2 in which the locking hole for locking the said case is provided in the wall surface of a chassis. The antenna peripheral circuit is an amplifier circuit,
The circuit board is supported by a projecting portion projecting into a storage space provided on the wall surface of the chassis, and a claw portion extending in the circumferential direction of the edge portion at the end of the wall surface is provided on the storage space side. The circuit board is supported and fixed in the storage space by bending the supported circuit board by the claw portion and pressing the surface of the circuit board opposite to the bottom of the chassis. Item 4. The circuit module for glass antenna according to any one of Items 1 to 3.   In addition to the chassis having the storage space, the module body includes a metal plate that is electrically connected to an input end of an amplifier circuit provided on the circuit board and extends outward from the storage space of the chassis, The circuit module for glass antennas of any one of Claims 1-4 with which the edge or area | region located in the opposite side to this storage space of a metal plate is joined with the said electric power feeding side base plate.   The glass case circuit module according to claim 3, wherein the case is provided with a locking claw that engages with a locking hole of the chassis. In addition to the chassis having the storage space, the module body is electrically connected to an input end of an amplifier circuit provided on the circuit board, and a metal plate extending outward from the chassis storage space is provided on the module body. Provided as a power supply side terminal, a through hole is provided in an end or a region of the metal plate located on the opposite side of the storage space, and a screw passing through the through hole is inserted into the screw hole of the power supply side base plate. By screwing, the module body and the power supply side base plate are joined,
Further, the bottom of the chassis in the storage space is provided with a stepped portion protruding from the bottom surface into the storage space in a shelf shape so as to correspond to the stepped portion of the ground side base plate as a ground side terminal of the module body. The step portion is provided with a through-hole penetrating the bottom of the chassis, and the chassis and the ground-side base plate are joined by screwing the screw penetrating the through-hole with the screw hole of the ground-side base plate. The circuit module for glass antennas of Claim 2. When assembling the circuit module for glass antenna according to claim 1,
A method of assembling a circuit module for a glass antenna, wherein the ground side base plate is bonded to the window glass plate using a double-sided tape and an adhesive. When assembling the circuit module for glass antenna according to claim 1,
The glass antenna according to claim 8, wherein the ground side base plate is bonded to the window glass plate using a double-sided tape and an adhesive, and then connected to a metal layer provided on the window glass plate by soldering. For assembling circuit modules.

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