JP3532839B2 - Car interior antenna - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle interior antenna that can be installed inside a vehicle.

[0002]

2. Description of the Related Art Heretofore, an antenna mounted on a trunk lid or a roof has been known as an antenna mounted on a vehicle. The roof antenna attached to the roof is suitable as a vehicle-mounted antenna because the antenna is located at a high place and the roof can be used as a ground plane. Further, as an antenna to be mounted on a vehicle, a glass antenna embedded in a rear glass of the vehicle or a film antenna having an antenna pattern printed is known.

[0003]

In these conventional vehicle-mounted antennas, a plurality of elements are installed in order to perform good reception even while the vehicle is traveling.
The element having the highest received power among them has been selected and received. However, in order to select any one of the plurality of elements in this way, it is necessary to guide the reception signals of all the elements to the selection means. For this reason, many cables have to be laid in the passenger compartment, but since the antenna is installed in the rear part or on the roof, the cable laying distance becomes long and it becomes difficult to secure the space. There was a problem. Further, there is a problem that the amount of work for mounting the antenna having a plurality of elements is large and that the interior work needs to be removed for laying, so that the laying work takes a long time when the laying distance is long.

Therefore, an object of the present invention is to provide a vehicle interior antenna which can reduce the number of cables and can easily carry out antenna mounting work and laying work.

[0005]

In order to achieve the above object, a vehicle interior antenna of the present invention is an antenna provided with a plurality of elements provided on a windshield , and received by the plurality of elements in the antenna. A mirror unit for confirming the rear side, which has at least a switching circuit for selecting one of the signals, and the mirror unit includes a base unit for fixing to the windshield. A plurality of contact terminals provided on the fixing surface of the base portion are respectively brought into contact with terminals formed at respective feeding points of the plurality of elements of the antenna when the is affixed to the windshield. Thus, the plurality of elements of the antenna are connected to the switching circuit, respectively.

Further, in the vehicle interior antenna of the present invention, the antenna may be a film antenna in which the plurality of elements are formed on a film substrate.

According to the present invention as described above, the switching circuit for selecting any one of the signals received by the plurality of elements is built in at least the mirror means.
Further, when the mirror means is fixed, the switching means and the plurality of elements can be connected. As a result, only one cable is required to guide the received signal,
The laying work and the space can be easily secured. Further, since the mirror means is provided on the windshield and its vicinity and the receiving device is also installed in the front part of the vehicle compartment, the length of the cable can be shortened, and the laying work can be easily performed in a short time. become able to. Furthermore, by using a film antenna as the antenna, the antenna can be easily attached to the windshield.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing a configuration example of an embodiment of a vehicle interior antenna of the present invention. 2 and 3 are perspective views showing the structure of the amplifier / switch built-in mirror which constitutes the vehicle interior antenna of the present invention, and FIG. 4 shows the structure of the antenna which constitutes the vehicle interior antenna of the present invention. It is shown. As shown in FIG. 1, the vehicle interior antenna according to the embodiment of the present invention includes an antenna 1 and an amplifier / switch built-in mirror 2. The antenna 1 includes a plurality of elements, the configuration of which is shown in FIG.

Here, the antenna 1 will be described with reference to FIG. 4. The antenna 1 is an antenna capable of receiving the VHF band and the UHF band, and the first VHF element 1b, the second VHF element 1d, and the first UH.
It has four elements, an F element 1c and a second UHF element 1e. In addition, a ground line 1a extending substantially parallel to these elements is provided. The contact terminals 1 are respectively provided at the ends of the four elements 1b to 1e.
1 is formed, and the four contact terminals 11 are gathered in one place shown as the mirror base attachment portion 10 and arranged linearly. The antenna 1 including the four elements 1b to 1e and the ground wire 1a can be formed on the windshield 3 by printing, vapor deposition, or embedded in the glass. Also, antenna 1
May be formed on the film substrate by printing, vapor deposition, or the like, and the antenna 1 may be provided on the windshield 3 by adhering the film substrate to the windshield 3. An inspection slip 4 and the like are attached to the windshield 3.

Returning to FIG. 1, a mirror 2 with a built-in amplifier / switch is fixed to approximately the center of the antenna 1. In this case, the base 21a of the mirror 2 with built-in amplifier / switch is attached so as to substantially coincide with the mirror base attaching position 10 shown in FIG. A terminal plate on which contact terminals are formed is housed on the back surface of the base 21a. By attaching the base 21a, the contact terminals 11 of the antenna 1 and the contact terminals of the terminal plate are in contact with each other. become. As a result, the four elements 1b to 1e of the antenna 1 and the ground wire 1a are connected to the terminal plate 26.

Details of the amplifier / switch built-in mirror 2 will now be described with reference to FIGS. As shown in FIG. 2, the amplifier / switch built-in mirror 2 includes a box-shaped mirror main body 21, a circuit board 22 housed in the mirror main body 21, and a circuit board 22 and a mirror 24 spaced apart from each other. It comprises a spacer 23 to be arranged, a mirror 24 for confirming the rear side, and a cover 25 fitted to the peripheral edge of the front surface of the mirror body 21. A foot portion 21b extends from the rear portion of the mirror body 21, and a base portion 21a is formed at the tip of the foot portion 21b. The terminal board 26 is housed in the base 21a, and the terminal board 26 is mounted on the base 21a.
It is exposed from the back side of.

The circuit board 2 housed in the mirror body 21.
2 has a built-in mirror amplifying / switching circuit 6 shown in FIG. The switching circuit incorporated in the circuit board 22 is a switching circuit that selects any one of the received signals from the elements 1b to 1e of the antenna 1 introduced via the terminal board 26. The amplifier circuit incorporated in the circuit board 22 is an amplifier circuit that amplifies and outputs the reception signal selected by the switching circuit, and is sufficient even when the antenna 1 is provided in the vehicle compartment and the gain is low. It is for obtaining received power. The reception signal output from the circuit board 22 is output via the RF signal line 29, the switching signal for controlling the switching circuit is input via the signal line 28, and the power supply of the mirror built-in amplification / switching circuit 6 is the power supply. Line 27
Be entered via. The RF signal line 29, the signal line 28, and the power supply line 27 are led out from the side surface of the base portion 21a. The ground wire 1a of the antenna 1 is the circuit board 2
It is connected to the ground of 2.

The spacer 23 is provided to separate the circuit board 22 and the mirror into the mirror body 21 and to house the circuit board 22, the spacer 23 and the mirror 24 in the mirror body 21. At the cover 25
The circuit board 22, the spacers 23, and the mirror 24 by fitting them to the peripheral portion of the mirror body 21.
It will be stored and fixed inside. FIG. 3 is a perspective view of the base portion 21a viewed from the front obliquely. As shown in this figure, a double-sided adhesive tape 21c is provided on the back surface of the base portion 21a, and the back surface is almost in the center. The terminal plate 26 is provided in a rectangular groove cut out in the portion. The terminal plate 26 is provided with five contact terminals 26a as shown in the figure. When the base portion 21a is attached to the mirror base portion attaching position 10 shown in FIG.
5 contact terminals 26a come into contact with each of the 5 contact terminals 11 formed at each end of the elements 1b to 1e in the antenna 1 shown in FIG. As a result, the reception signals received by the elements 1b to 1e of the antenna 1 are input to the circuit board 22, and
The ground line 1a comes to be connected to the ground of the circuit board 22.

The mirror built-in amplification / switching circuit 6 incorporated in the circuit board 22 will now be described with reference to FIG. The amplification / switching circuit 6 with a built-in mirror divides a switcher 61 including switches SW1 to SW4 for switching the reception signals of the elements 1b to 1e in the antenna 1 and a reception signal output from the switcher 61 into a UHF signal and a VHF signal. The UHF / VHF demultiplexing circuit 62 is provided. Further, a UHF AMP 63 that amplifies the UHF signal demultiplexed by the UHF / VHF demultiplexing circuit 62, and a UH
A VHF LPF 64 for filtering the VHF signal demultiplexed in the F / VHF demultiplexing circuit 62, and a UHF
UHF signal amplified by AMP63 and VHF LPF
U to mix with the VHF signal filtered at 64
An HF / VHF mixing circuit 65 is provided. Furthermore, UH
An FM cut filter 66 that removes an FM signal band component from the selected amplified, or filtered received signal output from the F / VHF mixing circuit 65 is provided.

In the amplifying / switching circuit 6 with a built-in mirror having the above-mentioned structure, the switching signal I inputted from the receiving device is inputted.
N is supplied to the switch 61, and one of the switches SW1 to SW4 of the switch 61 is turned on according to the switch signal IN. Although not shown, this switching control is performed by the switch 61.
This is performed by a switch control circuit provided inside.
In this case, if the UHF signal is selected, the UHF
Either the element 1c or 1e for
When the F signal is selected, either the VHF element 1b or 1d is selected. Here, for example, when the switch W1 is turned on and the VHF reception signal received by the first VHF element 1b is selected, this V
The HF signal is demultiplexed by the UHF / VHF demultiplexing circuit 62, and the VHF LPF 64 removes signal components in the VHF band or higher. Next, the UHF / VHF mixing circuit 65
The FM signal is removed by the FM cut filter 66 and is output. This output signal OUT is RF
The signal is input to the receiving device by connecting a plug 29a provided at the tip of the signal line 29 to an in-vehicle television or the like.

The receiving equipment detects the received power of the input received signal, and if sufficient received power cannot be obtained, it outputs a switching signal for switching the antenna element to amplify the amplifier / switching circuit 6 with a built-in mirror. Apply to. In response to this, the mirror built-in amplification / switching circuit 6 causes the switcher 61 to switch and control the elements 1b to 1e in the antenna 1 as described above. Since such switching control is performed until sufficient reception power is obtained, the reception signal is supplied to the receiving device from the element having the highest reception power.

Since the vehicle interior antenna according to the embodiment of the present invention is configured as described above, the mirror base portion attachment position 1 of the antenna 1 provided on the windshield 3
It can be installed by fixing the amplifier / switch built-in mirror 2 to 0. Further, even in the antenna 1 including a plurality of elements, since the RF signal line 29 led out from the amplifier / switch built-in mirror 2 can be one, the installation space can be secured and the installation work can be easily performed. be able to. In this case, between the antenna 1 and the mirror 2 with built-in amplifier / switch, amplification / amplification is performed at the mirror base attachment position 10.
Since the connection can be made by fixing the mirror 2 with a built-in switch, it is not necessary to lay a cable between them. Further, since the receiving device is usually provided in the front part of the vehicle interior and the vehicle interior antenna according to the present invention is provided in the front part of the vehicle interior, the RF signal line 29, the signal line 28,
The laying length of the cable 5 in which the power supply line 27 is integrated can be shortened, and the work can be easily performed in a short time.

Next, FIG. 6 is a perspective view showing a structural example of another embodiment of the vehicle interior antenna of the present invention. In the other vehicle interior antenna according to the embodiment of the present invention, the antenna 50 is provided on the windshield 3, and the amplifier / switch built-in mirror 102 is fixed to the ceiling of the vehicle interior above the windshield 3. It is something like. Another vehicle interior antenna according to the present invention shown in FIG. 6 is composed of an antenna 50 and an amplifier / switch built-in mirror 102. The antenna 50 includes four elements 51, 52, 53, and 54. These four elements 51-5
4 is provided on the upper part of the windshield 3. In this case, the antenna 5 including the four elements 51 to 54
The 0 can be formed on the windshield 3 by printing, vapor deposition, or embedded in the glass. Alternatively, the antenna 50 may be formed on the film substrate by printing, vapor deposition, or the like, and the film substrate may be attached to the windshield 3 to provide the antenna 50 on the windshield 3. An inspection slip 4 and the like are attached to the windshield 3.

The four elements 5 in the antenna 50
The lines derived from 1 to 54 are gathered immediately above the windshield 3, and the amplifier / switch built-in mirror 102 is fixed to the mirror base attachment position. The structure of the amplifier / switch built-in mirror 102 is similar to that of the amplifier / switch built-in mirror 2 shown in FIGS. A terminal plate on which contact terminals are formed is housed on the back surface of the base 121a, and the lines derived from the four elements 51 to 54 in the antenna 50 are attached by attaching the base 121a. The contact terminal formed at the tip of the terminal comes into contact with the contact terminal on the terminal plate. As a result, the four elements 51 to 54 of the antenna 50 are input to the mirror built-in amplification / switching circuit built in the amplifier / switch built-in mirror 102 via the terminal plate.

The amplification / switching circuit with a built-in mirror built in the mirror 102 with a built-in amplification / switch is the same circuit as the amplification / switching circuit 6 with a built-in mirror shown in FIG. The received signal received by the optimum element of 51 to 54 is amplified or filtered and output via the cable 105.

The vehicle interior antenna constructed as above according to another embodiment of the present invention is amplified / amplified at the mirror base portion attachment position of the antenna 50 provided on the windshield 3.
It can be installed by fixing the mirror 102 with a built-in switch. Further, even in the antenna 50 including a plurality of elements, the number of RF signal lines derived from the amplifier / switch built-in mirror 102 can be reduced to one.
The laying space can be secured and the laying work can be easily performed. In this case, since the antenna 50 and the mirror with built-in amplifier / switcher 102 can be connected by fixing the mirror with built-in amplifier / switcher 102 at the position where the mirror base is attached, the cable laying work between them can be performed. You don't have to. Further, since the receiving device is usually provided in the front part of the vehicle interior and the vehicle interior antenna according to the present invention is provided in the front part of the vehicle interior, the RF signal line, the signal line for the switching signal, and the power supply line are provided. The laying length of the integrated cable 105 can be shortened, and the work can be easily performed in a short time.

In the above description, the amplifier / switch built-in mirror which constitutes the vehicle interior antenna of the present invention is fixed to the windshield or the ceiling of the vehicle compartment by a double-sided adhesive tape. However, the present invention is not limited to this, and the amplifier / switch built-in mirror may be fixed by screws and nuts, or the amplifier / switch built-in mirror may be fixed by using a fixing metal fitting.

[0023]

As described above, the present invention is provided with a switching circuit for selecting any one of the signals received by a plurality of elements and an amplifier circuit for amplifying the signal output from the switching circuit in the vehicle interior. It is designed to be built into the mirror with built-in amplifier / switch. Further, when the mirror with built-in amplifier / switch is fixed, the switching circuit and the plurality of elements are connected. As a result, only one cable is required to guide the received signal, and it is possible to easily perform the laying work and secure the space. In addition, since the mirror with built-in amplifier / switch is installed on the windshield and its vicinity, and the receiving device is also installed in the front part of the vehicle interior, the length of the cable can be shortened and the laying work can be done in a short time. It can be done easily. Furthermore, by using a film antenna as the antenna, the antenna can be easily attached by being attached to the windshield or the ceiling in the vehicle compartment.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration example of an embodiment of a vehicle interior antenna of the present invention.

FIG. 2 is a perspective view showing a configuration of a mirror with a built-in amplifier / switcher of the vehicle interior antenna according to the exemplary embodiment of the present invention.

FIG. 3 is a perspective view showing a part of a mirror with built-in amplifier / switcher of the vehicle interior antenna according to the exemplary embodiment of the present invention in a different view point.

FIG. 4 is a diagram showing a configuration of an antenna of the vehicle interior antenna according to the exemplary embodiment of the present invention.

FIG. 5 is a block diagram showing a circuit configuration of a mirror built-in amplification / switching circuit built in a mirror having a built-in amplifier / switch according to an embodiment of the present invention.

FIG. 6 is a perspective view showing a configuration example of another embodiment of the vehicle interior antenna of the invention.

[Explanation of symbols]

1 antenna, 1a ground wire, 1b element,
1c element, 1d element, 1e element, 2 mirror with built-in amplifier / switch, 3 windshield, 4 check sheet, 5 cable, 6 switching circuit, 10
Mirror base part pasting position, 11 contact terminal, 21 mirror body, 21a base part, 21b foot part, 21c double-sided adhesive tape, 22 circuit board, 23 spacer, 24 mirror, 25 cover, 26 terminal plate, 26a contact terminal,
27 power line, 28 signal line, 29 RF signal line, 29a
Plug, 50 antenna, 51 element, 52
Element, 53 element, 54 element, 6
1 switch, 62 UHF / VHF branching circuit, 63 U
HF AMP, 64 VHF LPF, 65 UHF /
VHF mixing circuit, 66 FM cut filter, 102
Mirror with built-in amplifier / switch, 105 cable, 121a
Base

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ identification code FI H01Q 21/30 H01Q 21/30 (58) Fields investigated (Int.Cl. ⁷ , DB name) B60R 11/02 B60R 1/04 H01Q 1/22 H01Q 1/32 H01Q 3/24 H01Q 21/30

Claims (2)

(57) [Claims] 1. A mirror for confirming the rear, which has at least a built-in antenna provided with a plurality of elements provided on a windshield and a switching circuit for selecting one of signals received by the plurality of elements in the antenna. and means, said mirror means includes a base portion for securing to the front glass, when the base platform portion fixed to the windshield, provided fixing surface of the base portion The plurality of contact terminals are respectively brought into contact with terminals formed at respective feeding points of the plurality of elements of the antenna, so that the plurality of elements of the antenna are connected to the switching circuit, respectively. Car interior antenna characterized by being made. 2. The vehicle interior antenna according to claim 1, wherein the antenna is a film antenna in which the plurality of elements are formed on a film substrate.