JP2008153982A - Antenna unit for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent radio wave interference between an antenna for low frequency bands and an antenna for high frequency bands. <P>SOLUTION: An antenna 31 for VICS bands and an antenna 32 for low VHF bands are arranged in parallel at an internal space 5 side of an inner panel 3 at a back door A. The antennas are provided to be separated in the vertical direction and to extend in a vehicle cross direction. One of an antenna 33 for UHF bands and an antenna 34 for high VHF bands is attached to a side panel 10 at the right side of a vehicle body b1, and the other is attached to a side panel 10 at the left side of the vehicle body b1, respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an automobile antenna device, and more particularly to a technique for preventing radio wave interference between antennas.

  Currently, vehicles are provided with antenna devices for receiving various broadcast waves such as AM radio broadcast waves, FM radio broadcast waves, TV (UHF band and VHF band) broadcast waves, VICS, and the like.

  In Patent Document 1, an antenna element is printed on a window glass or has flexibility in order to ensure good reception sensitivity while avoiding a decrease in aesthetics and an increase in wind noise due to the adoption of a rod antenna protruding outside the vehicle. There has been disclosed a technique in which a film antenna having an antenna element printed on a film is attached to a window glass to receive a radio or television broadcast.

Patent Document 2 discloses a technique in which a loop antenna is disposed along a peripheral edge portion of an inner panel in a space formed between a resin inner panel and an outer panel constituting the door panel. ing.
JP 2005-260659 A JP 2006-295712 A

  However, in the conventional antenna apparatus, a low frequency band antenna for receiving 1CH to 3CH of TV broadcast waves, a low VHF charged wave such as AM and FM radio broadcast waves, and 4CH to 12CH and UHF bands of TV broadcast waves. Since the high-VHF band antenna for receiving high-VHF charged waves such as radio waves is disposed in the same window glass or door panel, the two antennas cannot be disposed sufficiently apart from each other. There was a possibility that radio wave interference might occur and reception sensitivity might deteriorate.

  The present invention has been made in view of such a point, and an object thereof is to prevent radio wave interference between a low frequency band antenna and a high frequency band antenna.

  In order to achieve the above-described object, the present invention is characterized in that an antenna for a low frequency band is disposed in an internal space of a back door and the antenna for a high frequency band is attached to a side panel.

  Specifically, the present invention includes a low frequency band antenna formed of a conductive wire, a high frequency band antenna formed of a conductive material having a shorter overall length than the low frequency band antenna, and an opening at the rear of the vehicle body. The tailgate portion and the resin inner panel and outer panel each formed with an opening for the rear window are joined together so as to have an internal space extending in the vehicle width direction at least on the upper edge side of the opening. An automobile antenna device comprising: a back door configured to open and close the tailgate portion; and side panels provided adjacent to the front of the back door and immovably disposed on both left and right side surfaces of the vehicle body. Targeted the following solutions.

  That is, according to the first aspect of the present invention, in the internal space of the back door, the low frequency band antenna is disposed so as to extend in the vehicle width direction, and at least one of the side panels on the left and right side surfaces of the vehicle body is provided. It has radio wave permeability, and the high frequency band antenna is attached to the inside of the side panel having radio wave permeability.

  According to a second aspect of the present invention, in the first aspect of the invention, the low frequency band antenna includes at least one of a VICS band antenna and a low VHF band antenna, and the high frequency band antenna includes a UHF band. And at least one of a high-VHF band antenna.

  According to a third aspect of the present invention, in the first aspect of the invention, the side panels on the left and right side surfaces of the vehicle body both have radio wave permeability, and the low frequency band antenna is provided in the front-rear direction and the vertical direction. Among them, the antenna for VICS band and the antenna for low VHF band arranged side by side apart in at least one direction, the antenna for high frequency band is composed of an antenna for UHF band and an antenna for high VHF band, One of the antennas is attached to the side panel on the right side of the vehicle body, and the other is attached to the side panel on the left side of the vehicle body.

  According to the first aspect of the present invention, the low frequency band antenna is disposed in the interior space of the back door, while the high frequency band antenna is attached to the side panel adjacent to the front of the back door. By effectively utilizing these, the low frequency band antenna and the high frequency band antenna can be disposed sufficiently apart from each other, and radio wave interference between both antennas can be prevented to improve reception performance.

  According to the second aspect of the present invention, antennas having different operating frequency bands can be arranged at optimum locations, which is advantageous in improving reception sensitivity.

  According to the invention of claim 3, the low VHF band antenna and the VICS band antenna forming the low frequency band antenna are separated from each other in at least one of the front-rear direction and the vertical direction, and are arranged in parallel in the internal space of the back door. Since the UHF band antenna and the high VHF band antenna, which form the high frequency band antenna, are attached to the side panels on the left and right sides of the vehicle body, the four antennas with different operating frequency bands are set to the optimum locations. Can be arranged, and high reception performance can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature and is not intended to limit the present invention.

  FIG. 1 shows an automobile B provided with a back door A according to an embodiment of the present invention, and FIG. 1 shows a state where the back door A is opened by a pair of left and right damper stays C. As shown in FIGS. 2 and 3, the back door A has a resin outer panel 1 formed with a rear window opening 8 and a resin inner panel 3 on the upper edge side of the opening 8. A back door body 7 integrally joined so as to have an internal space 5 extending in the width direction is provided, and inner ends of both ends in the vehicle width direction of the upper end portion of the back door body 7 have a pair of left and right hinge members 9, 9. Through the rear end of the opening b2 (tailgate portion) of the vehicle body b1 of the automobile B, and the back door A is pivoted up and down around the hinge members 9 and 9 to open the opening b2. It can be opened and closed. Here, as a means for joining the outer panel 1 and the inner panel 3 constituting the back door A, they are joined by using an adhesive, hot plate welding, vibration welding, high frequency welding or the like.

  The damper stay C is composed of a tube 11 in which gas is sealed, and a rod 13 that is inserted into the tube 11 so as to be extendable and urged in a direction that always protrudes due to the gas pressure. A base end of a certain tube 11 is pivotally attached to the vehicle body b1 so as to be swingable outside the opening b2.

  A pair of substantially L-shaped reinforcing members 15 made of a metal plate are fixedly arranged on the inner space 5 side surface of the inner panel 3 at both the side edge and the upper edge in the vehicle width direction of the back door body 7. The upper end of the reinforcing member 15 is connected to the hinge member 9 and the lower end is connected to the inner panel 5 side surface of the inner panel 3 by fastening with bolts. In addition, the reinforcing member 15 has screw holes in a boss portion (not shown) in which an appropriate number of portions extending in the longitudinal direction protrude from the inner space 5 side of the inner panel 3 at appropriate positions in the longitudinal direction. It is screwed together and fastened.

  The upper ends of the pair of left and right reinforcing members 15 are connected by a connecting member 16 having a concave cross section that extends in the vehicle width direction and opens upward. Further, the connecting member 16 functions as a door reinforcing member by fastening an appropriate number of locations in the vehicle width direction to the inner space 5 side surface of the inner panel 3 by rivets 17, 17,.

  The tip of the rod 13 of the damper stay C is attached to a bracket 14 provided on the outer surface of the inner panel 3 so as to be rotatable (swingable), and the lower end of the damper stay C is the lower end of the reinforcing member 15 and the inner panel 3. The back door main body 7 is always urged in the opening direction by the damper stay C.

  As shown in FIG. 3, a concave portion 1a extending in the vehicle width direction is formed at a position above the opening 8 in the outer panel 1, and a high-mount stop lamp 35 is attached to the concave portion 1a. Further, the periphery of the opening 8 of the outer panel 1 is adhered to the periphery of the rear window glass 36 to close the opening 8.

  As shown in FIGS. 1 and 2, the automobile B includes radio (FM, AM broadcast), TV (UHF band and VHF band) broadcast radio waves, VICS (Vehicle Information and Communication System), and the like. And an antenna device for guiding the received signal to an information communication device 41 (see FIG. 6) such as a car navigation system, a radio, and a television in the vehicle interior via a tuner 40 (see FIG. 6).

  This antenna device has a lower overall length than an antenna for a low frequency band formed of a conductive wire for receiving a broadcast wave in a low frequency band and an antenna for a low frequency band for receiving a broadcast wave in a high frequency band. And a high frequency band antenna formed of a short conductive material.

  Specifically, the low frequency band antenna includes a VICS band antenna 31 for receiving radio FM waves and VICS band radio waves having a frequency band of 76 MHz to 90 MHz, and a VHF (30 MHz to 300 MHz frequency band). It is composed of a low VHF band antenna 32 for receiving a low VHF charged wave such as 1CH to 3CH of a TV broadcast wave that is a frequency band of 88 MHz to 108 MHz among radio waves in a very high frequency band. .

  The high frequency band antenna includes a UHF band antenna 33 for receiving a UHF (Ultra-High Frequency) charged wave having a frequency band of 300 MHz to 3000 MHz, and 170 MHz to 225 MHz of VHF band radio waves. And a high VHF band antenna 34 for receiving a high VHF charged wave such as 4CH to 12CH of a TV broadcast wave having a frequency band of.

  The dimensions of the antennas 31 to 34 are set in relation to the frequency of the reception target medium.

  As shown in FIG. 3, the VICS band antenna 31 and the low VHF band antenna 32 that form the low frequency band antenna are made of a linear conductive wire made of stainless steel and having a wire diameter of about 3 mm. They are arranged side by side in the front-rear direction of b1, and are arranged in the interior space 5 of the back door A so as to extend in the vehicle width direction.

  The antennas 31 and 32 are arranged substantially horizontally. For example, the rear low VHF band antenna 32 is arranged below the front VICS band antenna 31 in the vertical direction. On the contrary, the rear low VHF band antenna 32 may be disposed above the front VICS band antenna 31. In short, the two antennas 31 and 32 may be arranged in parallel in a manner separated from at least one of the front-rear direction and the vertical direction. Hereinafter, the arrangement of the antennas 31 and 32 will be described.

  As shown in FIGS. 3 and 4, support ribs 3a, 3a,... Projecting toward the outer panel 1 so as to extend in the vertical direction are provided on the surface of the inner panel 3 on the inner space 5 side. A plurality are arranged at intervals in the width direction.

  Between the plurality of support ribs 3a, 3a,..., Connecting ribs 3b, 3b extending in the vehicle width direction with a space in the vertical direction are juxtaposed, and the plurality of support ribs 3a, 3a,. .. and the connecting ribs 3b, 3b,. Here, the support rib 3 a and the connecting rib 3 b are integrally formed with the inner panel 3.

  As shown in FIG. 5, antenna receiving grooves 3c, 3c,... Having a substantially U-shaped cross section along the connecting rib 3b are provided at the projecting side ends of the plurality of support ribs 3a, 3a,. Each is formed.

  Of the antenna receiving grooves 3c, 3c,... Formed in the support rib 3a, the front antenna receiving grooves 3c, 3c,. The low VHF band antenna 32 is housed in the housing grooves 3c, 3c,.

  These antennas 31 and 32 are held by the clip 22 so as not to drop out of the antenna receiving grooves 3c, 3c,. The clip 22 is formed by bending a spring wire, and both antennas are used to hold the holding portion 22a for holding the connecting rib 3b, the VICS band antenna 31 and the low VHF band antenna 32. And an annular holding portion 22b having an inner diameter substantially the same as the outer diameters of 31 and 32. In addition, the clearance gap between the clamping parts 22a and 22a is formed smaller than the plate | board thickness of the connection rib 3b.

  Then, the gap between the holding portions 22a, 22a of the clip 22 is expanded against the elastic force and pushed into the antennas 31, 32 accommodated in the antenna accommodating grooves 3c, 3c,. Both antennas 31 and 32 are adapted to fit into the holding portion 22b. Then, by holding the connecting rib 3b with the holding portion 22a while holding both the antennas 31 and 32 with the holding portion 22b of the clip 22, both the antennas 31 and 32 are removed from the antenna receiving grooves 3c, 3c,. It does not fall out.

  Three clips 22 are attached to the VICS band antenna 31 at intervals in the vehicle width direction. Similarly, three low VHF band antennas 32 are attached at intervals in the vehicle width direction.

  Here, the protrusion height of the support rib 3a from the inner panel 3 surface is such that both antennas 31 and 32 interfere with the inner space 5 side surface of the outer panel 1 in a state where the outer panel 1 and the inner panel 3 are joined together ( It is set so as to be close to a position where it does not abut. In this way, both antennas 31 and 32 can be disposed at the highest position in the internal space 5 of the back door A, which is advantageous in improving the reception sensitivity.

  As shown in FIG. 4, at one end (right side in FIG. 4) of the VICS band antenna 31 and the low VHF band antenna 32, a received signal is transmitted through a tuner 40 to a car navigation system, a radio, a TV, etc. A shield wire 25 leading to the information communication device 41 is attached.

  The shield wire 25 is constituted by a coaxial cable in which an inner conductor 25a with a sheath is wrapped with an outer conductor 25b made of a thin metal conductor, and further provided with an outer sheath. The external conductor 25b prevents electromagnetic and electrostatic noise from the outside from entering the internal conductor 25a. Further, the antennas 31 and 32 can be grounded by pulling out a part of the metal conducting wire constituting the external conducting wire 25b and using it as a grounding wire for grounding to the vehicle body b1. At the front end of the shield wire 25 on the antenna side, the external conductor 25b is peeled off and the internal conductor 25a is exposed, and the internal conductor 25a and one end of the antennas 31 and 32 are brazed. 31 and 32.

  The shield lines 25 and 25 wired from the VICS band antenna 31 and the low VHF band antenna 32 are bundled as one connection wiring to be connected to the tuner 40 and then wired in the vehicle interior. .

  Next, the arrangement of the UHF band antenna 33 and the high VHF band antenna 34 forming the high frequency band antenna will be described.

  As shown in FIG. 1, the automobile B includes side panels 10 and 10 (quarter windows) that are adjacent to the front of the back door A and are immovably provided on both left and right side surfaces of the vehicle body b1. The side panels 10 and 10 are made of glass having radio wave permeability, and the above-described high frequency band antenna is attached to the inside of the vehicle so as to extend in the vehicle front-rear direction. Specifically, one of the antennas 33 and 34 is attached to the side panel 10 on the right side of the vehicle body, and the other is attached to the side panel 10 on the left side of the vehicle body.

  That is, the UHF band antenna 33 and the high VHF band antenna 34 are printed on a film and attached to both the left and right side surfaces of the vehicle body b1 in a separated state. The UHF band antenna 33 and the high VHF band antenna 34 are separated from the VICS band antenna 31 and the low VHF band antenna 32 attached to the back door A, which is advantageous in preventing radio wave interference. It becomes.

  The UHF band antenna 33 and the high VHF band antenna 34 are within the range not affected by noise from the metal upper frame of the vehicle body b1 and improve the side panel 10 as much as possible in order to improve reception performance. It is preferable to arrange in the upper position.

  As described above, according to the automobile antenna device according to the present embodiment, the VICS band antenna 31 and the low VHF band antenna 32 that form the low frequency band antenna are separated from each other in the vertical direction and the interior of the back door A. Since the UHF band antenna 33 and the high VHF band antenna 34 that form the high frequency band antenna are mounted on the side panels 10 and 10 on the left and right sides of the vehicle body b1, respectively, while being juxtaposed in the space 5, the back door A By effectively using the side panels 10 and 10, the antenna for low frequency band and the antenna for high frequency band are sufficiently separated from each other, and the four antennas 31 to 34 having different use frequency bands are arranged at the optimum locations. And high reception performance can be obtained.

  As described above, the present invention provides a highly practical effect that can prevent radio wave interference between a low-frequency band antenna and a high-frequency band antenna. The availability of is high.

It is a side view of the rear part of a vehicle body in a state where the back door of the automobile according to the embodiment of the present invention is opened. It is drawing of the state which opened the back door of FIG. 1 and looked up from the back side. It is sectional drawing in the III-III line | wire of FIG. 2, It is drawing which shows the state which closed the back door. It is a top view for demonstrating arrangement | positioning of the antenna in internal space. It is a perspective view explaining the procedure which attaches an antenna to the support rib of an inner panel. It is a schematic diagram which shows the state which connected the antenna to the information communication equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer panel 3 Inner panel 5 Internal space 8 Opening part 9 Hinge member 10 Side panel 31 VICS band antenna (low frequency band antenna)
32 Low VHF band antenna (low frequency band antenna)
33 UHF band antenna (high frequency band antenna)
34 High VHF band antenna (High frequency band antenna)
A Back door B Automobile b1 Car body b2 Opening (tailgate)

Claims (3)

An antenna for a low frequency band formed of a conductive wire,
A high frequency band antenna formed of a conductive material having a shorter overall length than the low frequency band antenna;
A tailgate opening at the rear of the vehicle body,
A resin inner panel and an outer panel, each having an opening for a rear window, are integrally joined so as to have an internal space extending in the vehicle width direction at least on the upper edge side of the opening. A back door for opening and closing the gate,
An automobile antenna device comprising a side panel adjacent to the front of the back door and provided immovably on both left and right sides of the vehicle body,
In the internal space of the back door, the low frequency band antenna is disposed so as to extend in the vehicle width direction,
At least one of the left and right side panels of the vehicle body has radio wave transmission, and the high frequency band antenna is attached to the inside of the side panel having radio wave transmission. A feature of an automobile antenna device. In claim 1,
The low frequency band antenna is composed of at least one of a VICS band antenna and a low VHF band antenna,
The high frequency band antenna includes at least one of a UHF band antenna and a high VHF band antenna. In claim 1,
Both side panels on the left and right sides of the vehicle body have radio wave transmission,
The low frequency band antenna is composed of a VICS band antenna and a low VHF band antenna arranged side by side in at least one of the front and rear direction and the vertical direction.
The high frequency band antenna is composed of a UHF band antenna and a high VHF band antenna, one of which is attached to the side panel on the right side of the vehicle body and the other is attached to the side panel on the left side of the vehicle body. An automobile antenna device characterized by the above.

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