JP2014171059A - Window frame - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle antenna device which obtains good antenna characteristics while inhibiting influences on the appearance of a vehicle.SOLUTION: A body 100 of a window frame 10 includes: a first overlapping portion 110A which overlaps with a first flat surface portion 34A of a door frame 34; and a second overlapping portion 110B which overlaps with a second flat surface portion 34B of the door frame 34 while sandwiching a peripheral edge part of a rear window 32 therebetween. An coaxial cable 220 extends in the second overlapping portion 110B in the window frame body 100.

Description

  The present invention relates to a window frame attached to a vehicle such as an automobile.

  With the expansion of wireless communication applications, antennas that operate in various frequency bands have been demanded. For example, as an antenna for vehicles, terrestrial digital broadcasting such as FM / AM broadcasting, DAB (Digital Audio Broadcast), DTV (Digital Television), 3G (3rd Generation), LTE (Long Term Evolution), GPS (Global Positioning System), VICS (registered trademark) (Vehicle Information and Communication System), ETC (Electronic Toll Collection), Tel-Starter (Engine Starter) There is a demand for antennas that operate in the same frequency band.

  As described above, there are antennas for various uses as vehicle antennas. If these antennas are inadvertently attached to the vehicle, the appearance of the vehicle will be affected. For this reason, when an antenna for a vehicle is attached to the vehicle, the installation location is set so as not to affect the appearance of the vehicle and to obtain good antenna characteristics in a target frequency band. And the shape must be determined.

  For example, Patent Document 1 below discloses a high-frequency glass antenna for an automobile in which an antenna conductor and a power feeding portion are provided between a vehicle inner side (which has the same meaning as the passenger compartment side) glass plate and a vehicle outer side glass plate. ing. According to this antenna, since the antenna conductor has a loop portion, the antenna conductor has a plurality of resonance frequencies. Therefore, a desired broadcast frequency band is broadcast in a wide band without deteriorating the visual field and aesthetics of the window. Even in the frequency band, good antenna characteristics (high antenna gain and high F / B ratio) can be obtained. In addition, according to this antenna, the area occupied by the antenna conductor and the power feeding portion is small, so that it can contribute to a reduction in space.

  Patent Document 2 below discloses a window glass antenna in which a hot-side antenna wire is disposed in a horizontal direction so as to be electromagnetically coupled to an upper horizontal side of a metal window frame. According to this antenna, it is said that even a vertically polarized antenna can be disposed in the horizontal direction without substantially reducing the reception sensitivity.

JP 2008-22538 A (published January 31, 2008) Japanese Patent Laid-Open No. 7-46016 (published on February 14, 1995)

  However, since the glass antennas described in Patent Documents 1 and 2 are arranged on a transparent window glass and are visible from both inside and outside the vehicle, the appearance of the vehicle and the visibility from the vehicle are not limited. Will be affected. As another antenna installation method that does not depend on a glass antenna, for example, a method of installing an antenna on a vehicle body (for example, a roof portion) is conceivable. However, even if such an antenna installation method is adopted, the influence on the appearance of the vehicle still becomes a problem. For example, since a general shark fin type antenna device protrudes from the roof surface, it greatly affects the design and aerodynamic characteristics of an automobile. Thus, conventionally, it has been difficult for a vehicle antenna to obtain good antenna characteristics while suppressing the influence on the appearance of the vehicle.

  The present invention has been made in view of the above problems, and an object of the present invention is to realize a vehicular antenna device capable of obtaining good antenna characteristics while suppressing the influence on the appearance of the vehicle.

  In order to solve the above-mentioned problems, a window frame according to the present invention has an opening for arranging a window, a first plane portion located on the outer peripheral side, and the first plane located on the inner peripheral side. A window frame attached to a metal frame having a second plane portion located on the vehicle compartment side of the plane portion, wherein the window frame body is attached to the outside of at least a part of the metal frame, and the window frame An antenna installed on the main body, and a coaxial cable connected to the antenna and extending inside the window frame main body, the window frame main body including a first overlapping portion that overlaps the first planar portion; A second overlapping portion that overlaps the second planar portion through the window, and the coaxial cable extends inside the second overlapping portion. That.

  According to the window frame, since the coaxial cable extends inside the second overlapping portion, the coaxial cable extends away from the metal frame, so that better antenna characteristics can be obtained. it can. In such a configuration, it is clear from the inventors' verification that better antenna characteristics can be obtained.

  In the window frame, it is preferable that the coaxial cable and the window overlap each other inside the second overlapping portion.

  According to the window frame, since the window is interposed between the window frame and the metal frame, the coaxial cable extends away from the metal frame, so that better antenna characteristics can be obtained.

  In the window frame, it is preferable that the coaxial cable extends along an edge of the window frame main body inside the second overlapping portion.

  According to the window frame, since the coaxial cable extends along the edge of the window frame main body, better antenna characteristics can be obtained. In such a configuration, it is clear from the inventors' verification that better antenna characteristics can be obtained.

  In the window frame, an outer surface of the metal frame is substantially perpendicular to a ground plane, and the antenna is an antenna for receiving vertically polarized waves, and an antenna pattern forming surface of the antenna. However, the metal frame is preferably installed on the window frame main body so as to be substantially parallel to the surface of the metal frame outside the vehicle.

  According to the above window frame, in a state in which the window frame main body is attached to the metal frame (that is, in a use state), the antenna pattern forming surface is in a posture substantially perpendicular to the ground plane. Reception sensitivity can be improved.

  In the window frame, it is preferable that the coaxial cable extends at a position farther from the metal frame than the antenna inside the second overlapping portion.

  According to the window frame, since the coaxial cable extends away from the metal frame, better antenna characteristics can be obtained.

  The said window frame WHEREIN: It is preferable that the said antenna is installed in the space formed inside the said window frame main body.

  According to the said window frame, the said antenna can be arrange | positioned in the position which is not exposed outside a vehicle, without interfering with attachment of a window frame.

  In the window frame, it is preferable that the antenna is installed in a gap formed between the window frame body and the metal frame on a surface of the window frame body on the passenger compartment side.

  According to the said window frame, the said antenna can be arrange | positioned in the position which is not exposed outside a vehicle, without interfering with attachment of a window frame.

  The window frame further includes an amplifier circuit that is connected to the coaxial cable and amplifies an electric signal generated by the antenna, and the amplifier circuit includes a window frame body on a surface of the window frame body on the vehicle interior side. It is preferable to be installed in a gap formed between the metal frame and the metal frame.

  According to the window frame, it is possible to further handle the amplifier circuit integrally. Further, the amplifier circuit can be arranged at a position where it is not exposed outside the vehicle without interfering with the attachment of the window frame.

  ADVANTAGE OF THE INVENTION According to this invention, the antenna apparatus for vehicles which can acquire a favorable antenna characteristic can be implement | achieved, suppressing the influence on the external appearance of a vehicle.

It is a perspective view showing the appearance of the window frame and vehicles concerning a 1st embodiment of the present invention. It is a three-plane figure which shows the structure of the window frame which concerns on 1st Embodiment of this invention. It is sectional drawing of the window frame shown to Fig.2 (a). The external appearance of the rear door in the state where the window frame of a 1st embodiment was attached is shown. It is sectional drawing of the rear door shown in FIG. It is a three-view figure which shows the structure of the window frame which concerns on 2nd Embodiment of this invention. It is sectional drawing of the window frame shown to Fig.6 (a).

[First Embodiment]
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described with reference to FIGS. In the following description, a direction corresponding to the front-rear direction of the vehicle 20 (x-axis direction in the figure) is referred to as “front-rear direction”, and a direction corresponding to the left-right direction of the vehicle 20 (y-axis direction in the figure) is referred to as “left-right direction”. The direction corresponding to the vertical direction of the vehicle 20 (the z-axis direction in the figure) is referred to as the “vertical direction”.

[Outline of window frame 10]
FIG. 1 is a perspective view showing the appearance of the window frame 10 and the vehicle 20 according to the first embodiment of the present invention. A window frame 10 shown in FIG. 1 is a thin plate-like component having a substantially rectangular shape in the longitudinal direction (z-axis direction in the drawing), and the B pillar portion of the rear door 30 of the vehicle 20 (the front side of the rear window 32 (see FIG. 1). This is a part attached to the portion extending along the edge of the middle x-axis positive side).

  The rear door 30 is configured to include a metal door frame 34 (see FIG. 4) having an opening for arranging the rear window 32, and the window frame 10 is a door at the B pillar portion of the rear door 30. The frame 34 is attached to the surface (surface on the vehicle outer side) of the portion constituting the B pillar portion. Since the surface of the window frame 10 (surface on the vehicle outer side) is formed smoothly, the appearance of the B pillar portion is adjusted by attaching the window frame 10.

  The window frame 10 includes a main body 100, a film antenna 210, a coaxial cable 220, and an amplifier circuit 230. The film antenna 210, the coaxial cable 220, and the amplifier circuit 230 are installed on the main body 100. . In the present embodiment, an example will be described in which the above-described components are provided on the window frame of the rear window 32 on the left side of the vehicle 20 (y-axis positive side in the drawing). Each component member may be provided. For example, you may make it provide said each structural member with respect to the window frame of the rear window of the right side of the vehicle 20 (y-axis negative side in the figure). Further, the above-described components may be provided on the window frame of the front window on the left side (y axis positive side in the figure) of the vehicle 20 or the window frame of the front window on the right side of the vehicle 20.

(Main body 100)
The main body 100 is a resin (non-metallic) member and forms the appearance of the window frame 10. The main part 110 of the main body 100 has a thin plate shape and a generally rectangular shape that is long in the vertical direction (z-axis direction in the figure). However, depending on the shape of the B pillar portion, It has a shape in which the front-rear width (the width in the x-axis direction in the figure) gradually increases toward the negative z-axis direction. As described above, the main body 100 is provided with the film antenna 210, the coaxial cable 220, and the amplifier circuit 230. Specifically, the film antenna 210 and the coaxial cable 220 are embedded in the main part 110 of the main body 100 so as not to be exposed to the outside of the vehicle, and the amplifier circuit 230 is not exposed to the outside of the vehicle. It is installed on the back surface (surface inside the vehicle) of the main part 110 of 100.

(Film antenna 210)
The film antenna 210 is for receiving radio waves in a target frequency band. The film antenna 210 includes a flexible substrate and an antenna pattern formed on the surface of the flexible substrate.

  The flexible substrate is a thin plate member having flexibility. For example, a dielectric film (for example, a polyimide film) is used as a material of the flexible substrate. The antenna pattern has a shape for receiving radio waves in a target frequency band, and includes, for example, a ground plane, a radiating element, a feeding point, a short-circuit portion, and the like. The film antenna 210 is classified into a loop antenna, a monopole antenna, an inverted F-type antenna, and the like according to an antenna pattern. A thin plate-like conductor foil (for example, copper foil) is used for the material of the antenna pattern.

  In the present embodiment, the film antenna 210 is a DAB antenna or a 3G / LTE antenna. Not limited to this, the film antenna 210 may be an antenna other than the above. However, the film antenna 210 is an antenna for receiving vertically polarized waves such as an antenna for DAB, an antenna for 3G / LTE, an antenna for FM / AM broadcasting, etc. It is preferable from the viewpoint.

(Coaxial cable 220, amplification circuit 230)
The amplifier circuit 230 is for operating the film antenna 210, and is mainly for amplifying an electrical signal generated by the film antenna 210. For this reason, the amplifier circuit 230 is electrically connected to the film antenna 210 by the coaxial cable 220. The amplifier circuit 230 is electrically connected to a device (not shown, for example, installed in the vehicle) to which the electric signal is supplied by a second coaxial cable 240 (see FIG. 2). The amplified electric signal can be supplied to the device.

[Configuration of window frame 10]
Next, the configuration of the window frame 10 will be described with reference to FIGS. FIG. 2 is a trihedral view showing the configuration of the window frame 10 according to the first embodiment of the present invention. FIG. 2A is a plan view of the window frame 10 according to the first embodiment of the present invention. FIG. 2B is a side view of the window frame 10 according to the first embodiment of the present invention. FIG. 2C is a front view of the window frame 10 according to the first embodiment of the present invention.

  FIG. 3 is a cross-sectional view of the window frame 10 shown in FIG. Fig.3 (a) is AA sectional drawing of the window frame 10 shown to Fig.2 (a). FIG. 3B is a BB cross-sectional view of the window frame 10 shown in FIG. FIG.3 (c) is CC sectional drawing of the window frame 10 shown to Fig.2 (a). 3A to 3C, the coaxial cable 220 is not shown in order to facilitate understanding of the configuration of the main part 110 of the main body 100.

[Configuration of Main Part 110 of Main Body 100]
As shown in FIG. 2, a space 102 for accommodating the film antenna 210 is formed in the main part 110 of the main body 100. Further, a groove 104, a through hole 106, and a through hole 108 for defining a wiring path of the coaxial cable 220 are formed in the main part 110 of the main body 100.

(Space 102)
The space 102 is formed in the vicinity of the upper end portion (end portion on the z-axis positive side in the drawing) of the main portion 110. A film antenna 210 is installed inside the space 102. Therefore, the space 102 has a shape and size that can accommodate at least the film antenna 210. In the example shown in FIG. 2, the space 102 has a rectangular shape slightly larger than the film antenna 210 when the main body 100 is viewed in plan as shown in FIG. However, the size is not limited to this.

  The installation method of the film antenna is not limited to the above, but the film antenna may be installed in a space formed in the main part 110 of the main body 100 as in the present embodiment. Thereby, the film antenna can be arranged so as not to be exposed outside the vehicle without interfering with the attachment of the window frame 10 to the door frame 34. Such a configuration is effective, for example, when there is not enough space between the main part 110 and the door frame 34.

(Groove 104)
The groove 104 is a portion that is dug from the surface of the main portion 110 and extends to the main portion 110 in order to wire the coaxial cable 220 drawn from the film antenna 210 so as to lead to the amplifier circuit 230. In the example illustrated in FIG. 2, the groove 104 includes a first straight portion 104A and a second straight portion 104B. As shown in FIG. 2A, the first straight line portion 104A starts from a position that overlaps the space 100A when the main body 100 is viewed in plan, and moves downward from the start point (in the negative z-axis direction in the drawing). It is a portion that extends linearly along the edge on the rear side (x-axis negative side in the drawing) of the main portion 110. The second straight line portion 104B has the end point of the first straight line portion as a start point, the end point is a position that overlaps with the area on the upper side (z-axis positive side in the figure) of the amplifier circuit 230, and forward from the start point to the end point. It is a portion that extends linearly (in the positive x-axis direction in the figure).

  In the example shown in FIG. 2, the groove 104 is open to the vehicle outer side (y-axis positive side in the figure), and the coaxial cable 220 is exposed only when the coaxial cable 220 is wired. Therefore, the groove 104 is preferably closed by some closing means after the coaxial cable 220 is wired. Examples of the closing means include a filler and a thin plate-like lid. Further, instead of the groove 104, another configuration capable of defining the path of the coaxial cable 220 may be adopted. For example, a through hole that penetrates the inside of the main part 110 along the path of the coaxial cable 220 may be provided inside the main part 110.

(Through holes 106, 108)
The starting point of the first straight portion 104A communicates with a space 102 provided on the back side thereof through a through hole 106 (shown in detail in FIG. 3A). Further, the end point of the second straight line portion 104B leads to a region in the vicinity of the amplifier circuit 230 on the back surface of the main portion 110 through the through hole 108 (shown in detail in FIG. 3C). .

(Managing coaxial cable 220)
Inside the space 102, the tip portion of the coaxial cable 220 on the film antenna 210 side is joined to the feeding point of the film antenna 210 by soldering or the like. The coaxial cable 220 drawn from the film antenna 210 passes through the through hole 106 and is drawn to the first straight portion 104A. The coaxial cable 220 extends downward (in the negative z-axis direction in the figure) along the inside of the first straight line part 104A, and ends at the end of the first straight line part 104A (in the negative z-axis side in the figure). Section) extends forward (in the positive x-axis direction in the drawing) along the inside of the second straight line portion 104B. Furthermore, the coaxial cable 220 is drawn out from the end point of the second straight line portion 104B (the end portion on the x-axis positive side in the drawing) to the back surface of the main portion 110 through the through hole 108. Thereafter, the coaxial cable 220 extends to the amplifier circuit 230 installed on the back surface of the main part 110, and the tip portion on the amplifier circuit 230 side is joined to the terminal of the amplifier circuit 230 by soldering or the like.

[Configuration of Other Parts of Main Body 100]
The main body 100 includes a door frame support part 120, a window support part 130, and an insertion part 140 in addition to the main part 110.

(Door frame support 120)
The door frame support portion 120 is a portion protruding from the back surface (the vehicle inner surface) of the main portion 110 to the back side (the y-axis negative side in the drawing) of the main portion 110 and the front side (x in the drawing) of the main portion 110. This is a portion extending in the vertical direction (z-axis direction in the figure) along the edge on the positive axis side. The door frame support portion 120 includes a first wall portion 120A perpendicular to the back surface of the main portion 110, and extends rearward (in the negative x-axis direction in the drawing) from the top of the first wall portion 120A. 110 and a second wall portion 120B parallel to the back surface of 110. Thereby, as shown in FIG. 2C and FIGS. 3A to 3C, the cross section of the door frame support portion 120 (the cross section perpendicular to the longitudinal direction) is the rear (x in the drawing). It has an L shape opening in the negative axis direction. When the window frame 10 is attached to the door frame 34, the edge of the door frame 34 is inserted into the opening formed by the door frame support 120 (see FIG. 5). Therefore, the thickness of the opening (the width in the y direction in the figure) formed by the door frame support 120 is substantially the same as (or slightly larger than) the edge of the door frame 34 inserted into the opening. ).

(Window supporter 130)
In order to guide and hold the edge of the rear window 32, the window support portion 130 protrudes from the back surface (the vehicle inner surface) of the main portion 110 to the back side (the y-axis negative side in the figure) of the main portion 110. This is a portion that extends in the vertical direction (z-axis direction in the drawing) along the edge on the rear side (x-axis negative side in the drawing) of the main portion 110. The window support portion 130 extends from the top of the first wall portion 130A perpendicular to the back surface of the main portion 110 to the rear side (in the negative x-axis direction in the drawing), and extends to the main portion 110. And a second wall portion 130B that is parallel to the back surface. Thereby, as shown in FIG. 2C and FIGS. 3A to 3C, the cross section (the cross section perpendicular to the longitudinal direction) of the window support portion 130 is rearward (the x axis in the figure). It has an L shape that opens in the negative direction. When the rear window 32 opens and closes in the vehicle 20 with the window frame 10 attached to the door frame 34, the edge of the rear window 32 is inserted into the opening formed by the window support 130, and the edge of the rear window 32 is inserted. Is guided and held (see FIG. 5). Therefore, the thickness (width in the y direction in the figure) of the opening formed by the window support 130 is substantially the same as (or slightly larger than) the edge of the rear window 32 inserted into the opening. It has become.

(Insertion part 140)
The insertion part 140 is a thin plate-like part extending from the lower end part (end part on the negative side of the z axis in the figure) of the main part 110 toward the lower side (negative direction in the z axis in the figure). For example, when the window frame 10 is attached to the door frame 34, the insertion portion 140 is inserted into a gap located below the attachment position. As a result, the window frame 10 can be easily and reliably positioned and fixed to the door frame 34 below.

[Assembly of window frame 10]
An example of the procedure for assembling the window frame 10 will be described. The following procedure is merely an example, and the plurality of steps shown below may be performed in any order.

  First, the film antenna 210 is installed in the space 102 of the main body 100. For example, the main body 100 of the window frame 10 includes a first plate-like member on the vehicle inner side (y-axis negative side in the drawing) and a second plate-like member on the vehicle outer side (y-axis positive side in the drawing). It is configured. A space 102 of the main body 100 is formed in the first plate member, and the space 102 has an opening facing the second plate member. The second plate-like member functions as a lid portion that closes the opening of the space 102. The film antenna 210 is installed in the space 102 of the first plate member from the opening. The film antenna 210 may only be placed in the space 102, but is preferably fixed in the space 102 by some fixing means (for example, an adhesive or an adhesive tape).

  Next, the amplifier circuit 230 is installed on the back surface of the main part 110 of the main body 100. The amplifying circuit 230 may be fixed to the back surface of the main part 110 by any fixing means.

  Then, the coaxial cable 220 is laid on the main body 100. Specifically, an intermediate portion of the coaxial cable 220 is laid on the groove 104. Then, the front end portion of the coaxial cable 220 on the film antenna 210 side is passed through the through hole 106, and the front end portion is drawn out to the space 102. Further, the front end portion of the coaxial cable 220 on the side of the amplifier circuit 230 is passed through the through hole 108, and the front end portion is pulled out to the back side of the main portion 110.

  Thereafter, the tip of the coaxial cable 220 on the film antenna 210 side is soldered to the feeding point of the film antenna 210. Further, the tip of the coaxial cable 220 on the side of the amplifier circuit 230 is soldered to a predetermined terminal of the amplifier circuit 230.

  Finally, the opening of the space 102 is closed with the second plate member (that is, the film antenna 210 installed in the space 102 is connected to the first plate member and the second plate). The first plate member and the second plate member are bonded to each other so as to be sandwiched between them. Thereby, the assembly of the window frame 10 is completed.

[Configuration of door frame 34 and method of attaching window frame 10]
Next, with reference to FIG. 4 and FIG. 5, the structure of the door frame 34 and the attachment method of the window frame 10 are demonstrated. FIG. 4 shows an appearance of the rear door 30 in a state where the window frame 10 of the first embodiment is attached. FIG. 5 is a cross-sectional view of the rear door 30 shown in FIG. Fig.5 (a) is DD sectional drawing of the rear door 30 shown in FIG. FIG. 5B is an EE cross-sectional view of the rear door 30 shown in FIG.

  As shown in FIG. 4, the window frame 10 is attached to the surface (the vehicle outer surface) of the door frame 34 at the B pillar portion of the rear door 30. At this time, although not shown, the insertion portion 140 of the window frame 10 is inserted into the gap of the rear door 30 located below the B pillar portion.

  As shown in FIG. 5, the door frame 34 has a first flat surface portion 34A located on the outer peripheral side and a second flat surface located on the inner peripheral side and located closer to the passenger compartment side than the first flat surface portion 34A. Part 34B. That is, in FIG. 5 showing a cross section of the B pillar portion, the door frame 34 includes a first flat portion 34A positioned in front of the edge of the rear window 32 (in the positive x-axis direction in the drawing), and the rear window 32. A second plane portion 34B located on the back side of the edge portion (y-axis negative side in the figure), and between the first plane portion 34A and the second plane portion 34B, There is a height difference. The reason for this is that the rear window 32 is arranged offset to the vehicle inner side (the negative side in the y-axis in the figure) so that the surface of the rear window 32 is substantially flush with the surface of the first flat portion 34A. For this reason, the second plane portion 34B located on the back side of the rear window 32 is recessed to the vehicle inner side (the negative side in the y-axis in the figure) with respect to the first plane portion 34A. .

  Along with the difference in height, the main portion 110 of the window frame 10 has a portion that directly overlaps the first plane (hereinafter referred to as “first” on the front side in the figure, the x-axis positive side). In the rear side (the negative side of the x-axis in the drawing), a portion (hereinafter referred to as “first portion”) that overlaps the second plane with the edge of the rear window 32 sandwiched therebetween 2 overlapped portion 110B "). As a matter of course, the first overlapping portion 110 </ b> A of the main portion 110 is a portion close to the metal door frame 34, and the second overlapping portion 110 </ b> B of the main portion 110 is a portion separated from the metal door frame 34. It becomes.

  With respect to the door frame 34 configured as described above, the window frame 10 has a front side (x-axis positive side in the drawing) portion (first overlapping portion 110A) as a door frame 34 (first flat portion 34A). And the rear side (x-axis negative side in the drawing) (second overlapping portion 110B) sandwich the edge of the front side of the rear window 32 (x-axis positive side). The door frame 34 (second flat portion 34B) is attached so as to overlap each other.

  At this time, as shown in FIG. 5, on the back side (the y-axis negative side in the drawing) of the window frame 10 (first overlapping portion 110A), the edge of the door frame 34 (first flat portion 34A) is It is inserted into the opening of the door frame support part 120 and is sandwiched by the door frame support part 120. Thereby, the window frame 10 is reliably fixed with respect to the predetermined position in the said B pillar part. Further, the window frame 10 may be more firmly fixed to the door frame 34 by other fixing means (for example, adhesive tape, adhesive, screw, rivet, pin, etc.).

  When the window frame 10 is attached to the rear door 30 in this way, as shown in FIG. 5, the edge of the front side of the rear window 32 (the x-axis positive side in the figure) is the main part of the window frame 10. 110 (second overlapping portion 110B) and the door frame 34 (second flat portion 34B) are inserted into the opening of the window support portion 130. As a result, the edge of the rear window 32 is guided and held by the window support 130. That is, in the present embodiment, the edge of the front side (the x-axis positive side in the drawing) of the rear window 32 is not fixed to the window support 130. This is because the rear window 32 can be opened and closed, and the movement of the rear window 32 is not hindered by the window support 130 when the rear window 32 is opened and closed.

  It should be noted here that, as shown in FIG. 5B, the amplifier circuit 230 is configured such that the door frame 34 (the first flat portion 34 </ b> A and the first plane portion 34 </ b> A) It is the point arrange | positioned in the clearance gap produced between the 2nd plane parts 34B). Thereby, the amplification circuit 230 can be disposed on the back surface of the main portion 110 without interfering with the attachment of the window frame 10 to the door frame 34 so as not to be exposed outside the vehicle. Note that the mounting position of the amplifier circuit 230 is not limited to the above, and for example, the amplifier circuit 230 may be disposed in a space formed in the main body 100 in the same manner as the film antenna 210.

[Features of window frame 10]
Hereinafter, the feature point employ | adopted as the window frame 10 of this embodiment is demonstrated.

  (Feature 1) In the window frame 10 of the present embodiment, all the constituent members (film antenna 210, coaxial cable 220, and amplifier circuit 230) other than the main body 100 are installed with respect to the main body 100. That is, in the window frame 10 of the present embodiment, all the above-described constituent members are integrated with the main body 100, thereby making it easy to handle attachment / detachment, replacement, and the like.

  (Feature 2) The window frame 10 of the present embodiment is configured so that all the above-described constituent members (the film antenna 210, the coaxial cable 220, and the amplifier circuit 230) are not exposed from the surface of the main body 100 (that is, from outside the vehicle). It is installed in the main body 100 (so that it cannot be seen). For this reason, the window frame 10 of this embodiment can implement | achieve the function as an antenna, without impairing the original function of the window frame 10 "to arrange the external appearance of the B pillar part of the rear door 30".

  (Feature 3) In the present embodiment, as the film antenna 210, an antenna for receiving vertically polarized waves (specifically, an antenna for DAB or an antenna for 3G / LTE) is employed. Thereby, the reception sensitivity by the film antenna 210 is improved in the window frame 10 of this embodiment. This is because, in the present embodiment, when the window frame 10 is attached to the vehicle 20, the film antenna 210 has an antenna pattern forming surface in a posture substantially perpendicular to the ground plane.

  (Feature 4) As shown in FIG. 5A, the groove 104 of the main body 100 has the rear window 32 sandwiched between the second overlapping portion 110B (that is, the door frame 34) in the main portion 110. Provided). As a result, as shown in FIG. 5A, the coaxial cable 220 is located farther from the metal door frame 34 than in the case where the coaxial cable 220 is provided in other parts inside the main part 110. It is stretched at.

  (Characteristic 5) As shown in FIG. 2B, the groove 104 of the main body 100 is a surface of the main part 110 with respect to the film antenna 210 (surface on the vehicle outer side (y axis positive side in the figure)). It is provided in the position near. As a result, the coaxial cable 220 extends in the main portion 110 at a position farther from the metal door frame 34 than the film antenna 210.

  (Feature 6) In particular, as shown in FIG. 5A, the groove 104 of the main body 100 is closest to the surface of the main portion 110 (the surface on the vehicle outer side (the y-axis positive side in the drawing)). Is provided. As a result, as shown in FIG. 5A, the coaxial cable 220 is extended inside the main portion 110 at a position further away from the metal door frame 34.

(Effects of feature points 4-6)
The inventors improve the radiation characteristics of the antenna 210 by separating the coaxial cable 220 from the metal door frame 34 as in the above feature points 4 to 6 (that is, the coaxial cable 220 is made of metal. It has been found that the radiation characteristics of the antenna 210 are reduced when it is close to the door frame 34). This is considered to be because of the following.

  The film antenna serves as a resonance circuit, and the coaxial cable 220 connected to the antenna and in a balanced state functions as a broadband antenna. On the other hand, when the coaxial cable 220 is arranged along the metal member, a signal having an opposite phase is induced in the metal member, and the signal propagating through the outer sheath of the coaxial cable 220 is attenuated. As a result, the coaxial cable becomes unbalanced and does not function as an antenna.

  In order to prove this, the inventors made a configuration of the present embodiment in which the coaxial cable 220 is separated from the metal door frame 34 and a comparative configuration in which the coaxial cable 220 is brought close to the metal door frame 34. Used to compare both radiation characteristics with each other.

  As a result of the verification, there was no significant difference between the configuration of the present embodiment and the configuration for comparison with respect to the voltage standing wave ratio. On the other hand, with respect to radiation efficiency, the configuration of the present embodiment gave better results than the configuration for comparison.

  As described above, it was found from the above verification that better radiation characteristics can be obtained by separating the coaxial cable 220 from the metal door frame 34.

  (Feature 7) As shown in FIG. 2A, the groove 104 of the main body 100 extends along the edge of the main portion 110 on the rear window 32 side (x-axis negative side in the drawing). As shown, the main portion 110 is formed. Thereby, as shown in FIG. 2A, the coaxial cable 220 is arranged along the edge of the main portion 110 on the rear window 32 side (the negative side of the x axis in the drawing) in the main portion 110. Stretched.

(Effects of feature point 7)
The inventors have found that the radiation characteristic of the antenna 210 is improved by extending the coaxial cable 220 along the edge of the main portion 110 as in the feature point 7. In order to prove this, the inventors compared the configuration of the present embodiment in which the coaxial cable 220 is extended along the edge of the main portion 110 and the configuration in which the coaxial cable 220 is extended away from the edge of the main portion 110. Both radiation characteristics were compared with each other using

  As a result of the verification, there was no significant difference between the configuration of the present embodiment and the configuration for comparison with respect to the voltage standing wave ratio. On the other hand, with respect to radiation efficiency, the configuration of the present embodiment gave better results than the configuration for comparison.

  As described above, it was found from the above verification that better radiation characteristics can be obtained by extending the coaxial cable 220 along the edge of the main portion 110. However, in the configuration for comparison, since the configuration in which the coaxial cable 220 is separated from the door frame 34 is adopted, sufficient radiation characteristics for use as an antenna device were obtained.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is a three-sided view showing the configuration of the window frame 10 ′ according to the second embodiment of the present invention. FIG. 6A is a plan view of a window frame 10 ′ according to the second embodiment of the present invention. FIG. 6B is a side view of the window frame 10 ′ according to the second embodiment of the present invention. FIG. 6C is a front view of the window frame 10 ′ according to the second embodiment of the present invention.

  FIG. 7 is a cross-sectional view of the window frame 10 ′ shown in FIG. FIG. 7A is an AA cross-sectional view of the window frame 10 ′ shown in FIG. FIG. 7B is a B-B ′ cross-sectional view of the window frame 10 shown in FIG. FIG.7 (c) is CC sectional drawing of the window frame 10 'shown to Fig.6 (a). 7A to 7C, the coaxial cable 220 is not shown in order to facilitate understanding of the configuration of the main part 110 of the main body 100.

  As shown in FIG. 6, in the window frame 10 ′ of the second embodiment, the film antenna 212 is installed on the back surface (the vehicle inner surface) of the main part 110 of the main body 100. For this reason, in the window frame 10 ′ of the second embodiment, the space 102 is not formed in the main part 110 of the main body 100. In addition, the wiring path of the coaxial cable 220 is changed in the main portion 110 so that the tip of the coaxial cable 220 on the film antenna 212 side is drawn out to the back side of the main portion 110 of the main body 100.

  Specifically, as shown in FIG. 6, in the window frame 10 ′ of the second embodiment, the main part 110 of the main body 100 has a groove 105 and a through hole 107 for defining the wiring path of the coaxial cable 220. , And a through hole 109 is formed.

  The groove 107 is a portion that is dug from the surface of the main portion 110 and extends to the main portion 110 in order to wire the coaxial cable 220 drawn from the film antenna 212 so as to lead to the amplifier circuit 230. In the example illustrated in FIG. 6, the groove 107 includes a first straight portion 107A, a second straight portion 107B, and a third straight portion 107C.

  First linear portion 107A starts from a position overlapping with the lower region (z-axis negative side in the figure) of film antenna 212, and extends linearly from the start point to the rear (x-axis negative direction in the figure). It is a part to do. The second straight line portion 107B starts from the end point of the first straight line portion and starts from the start point downward (in the negative z-axis direction in the figure) behind the main part 110 (in the negative x-axis side in the figure). It is the part extended | stretched linearly along the edge part. The third straight line portion 107C has the end point of the second straight line portion as a start point, the end point is a position overlapping with the upper side (z-axis positive side in the figure) of the amplifier circuit 230, and the front line from the start point to the end point It is a portion that extends linearly (in the positive x-axis direction in the figure).

(Through holes 107, 109)
The starting point of the first straight portion 107A is connected to a region in the vicinity of the film antenna 212 on the back surface of the main portion 110 through the through hole 107 (shown in detail in FIG. 7A). Further, the end point of the third straight line portion 107C leads to a region near the amplifier circuit 230 on the back surface of the main portion 110 by the through hole 109 (shown in detail in FIG. 7C). .

(Managing coaxial cable 220)
On the back side of the main part 110, the tip portion of the coaxial cable 220 on the film antenna 212 side is joined to the feeding point of the film antenna 212 by soldering or the like. The coaxial cable 220 drawn from the film antenna 212 passes through the through hole 107 and is drawn to the first straight portion 105A. The coaxial cable 220 extends rearward (in the negative x-axis direction in the figure) along the inside of the first straight line part 105A, and ends at the end of the first straight line part 105A (in the negative x-axis side in the figure). Part) extends downward (in the negative z-axis direction in the figure) along the inside of the second straight part 105B. Further, the coaxial cable 220 extends downward (in the negative z-axis direction in the figure) along the inside of the second straight line part 105B, and ends at the end of the second straight line part 105B (in the negative z-axis side in the figure). Section) extends forward (in the positive x-axis direction in the figure) along the inside of the third straight portion 105C. Furthermore, the coaxial cable 220 is drawn out from the end point (the end on the x-axis positive side in the drawing) of the third straight portion 105 </ b> C to the back surface of the main portion 110 through the through hole 108. Thereafter, the coaxial cable 220 extends to the amplifier circuit 230 installed on the back surface of the main part 110, and the tip portion on the amplifier circuit 230 side is joined to a predetermined terminal provided in the amplifier circuit 230 by soldering or the like. Is done.

  In this way, the film antenna may be installed in a gap formed between the main body 100 and the door frame on the back surface (the vehicle inner surface) of the main portion 110. Such a configuration is effective, for example, when it is possible to obtain good antenna characteristics by moving the film antenna closer to the metal plate while separating the coaxial cable from the metal plate.

  The film antenna 212 is similar to the amplifier circuit 230 (see FIG. 5B) on the back surface (surface on the negative side of the y-axis in the figure) of the main part 110 with the door frame 34 (the first flat portion 34A). The second flat surface portion 34B is disposed in a gap formed between the second flat surface portion 34B and the second flat surface portion 34B. Thereby, the film antenna 212 can be arranged on the back surface of the main part 110 so as not to be exposed outside the vehicle without interfering with the attachment of the window frame 10 to the door frame 34.

[Additional Notes]
The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims. That is, embodiments obtained by combining technical means appropriately modified within the scope of the claims are also included in the technical scope of the present invention.

(About the number of film antennas)
In each embodiment, an example in which one film antenna is installed in the main body 100 has been described. However, a configuration in which a plurality of film antennas are installed in the main body 100 may be employed. For example, in the first embodiment, a plurality of film antennas may be installed in the space 102 of the main part 110. In the second embodiment, a plurality of film antennas may be installed on the back surface of the main part 110.

(Regarding the application target of the window frame)
In each embodiment, the rear window 32 of the vehicle 20 is the application target of the window frame of the present invention. However, the present invention is not limited to this, and other windows provided in the vehicle 20 may be the application target of the window frame of the present invention. . In this case, the window to which the window frame of the present invention is applied may be a window that cannot be opened and closed.

  The present invention can be suitably used as a vehicle window frame mounted on a vehicle (mainly an automobile).

10 Window frame 20 Vehicle 30 Rear door 32 Rear window (window)
34 Door frame (metal frame)
34A 1st plane part 34B 2nd plane part 100 Main body (window frame main body)
DESCRIPTION OF SYMBOLS 102 Space 104 Groove 104A 1st linear part 104B 2nd linear part 106 Through-hole 108 Through-hole 110 Main part 110A 1st overlapping part 110B 2nd overlapping part 120 Door frame support part 130 Window support part 140 Insertion part 210 Film antenna (antenna)
220 Coaxial cable 230 Amplifier circuit

Claims (8)

A first plane portion located on the outer peripheral side and having an opening for arranging the window; and a second plane portion located on the inner peripheral side and located closer to the vehicle compartment side than the first plane portion; A window frame attached to a metal frame having
A window frame body attached to the outside of at least a part of the metal frame;
An antenna installed in the window frame body;
A coaxial cable connected to the antenna and extending inside the window frame body,
The window frame body is
A first overlapping portion that overlaps with the first planar portion and a second overlapping portion that overlaps with the second planar portion through the window;
The coaxial cable is
The window frame characterized by extending inside the second overlapping portion. The coaxial cable is
The window frame according to claim 1, wherein the window overlaps with each other inside the second overlapping portion. The coaxial cable is
The window frame according to claim 1, wherein the window frame extends along an edge of the window frame main body inside the second overlapping portion. The outer surface of the metal frame is generally perpendicular to the ground plane,
The antenna is
It is an antenna for receiving vertically polarized waves, and is installed on the window frame body so that the antenna pattern forming surface of the antenna is substantially parallel to the surface of the metal frame outside the vehicle. The window frame according to any one of claims 1 to 3, characterized in that: The coaxial cable is
5. The window frame according to claim 1, wherein the window frame extends inside the second overlapping portion at a position farther from the metal frame than the antenna. The antenna is
The window frame according to any one of claims 1 to 5, wherein the window frame is installed in a space formed inside the window frame main body. The antenna is
The window frame according to any one of claims 1 to 5, wherein the window frame body is installed in a gap formed between the window frame body and the metal frame on a surface of the window frame body on the vehicle interior side. . An amplifying circuit connected to the coaxial cable and amplifying an electric signal generated by the antenna;
The amplifier circuit is
The window frame according to any one of claims 1 to 7, wherein the window frame body is installed in a gap formed between the window frame body and the metal frame on a surface of the window frame body on the passenger compartment side. .

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