JP2004168153A - Door mirror device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door mirror device which not only receives a predetermined transmitted electric wave generated from the outside of a vehicle interior, but also simplifies the wiring work in connecting an antenna and a matching circuit, and the wiring work in grounding the matching circuit, further improves the transmission gain and receiving efficiency of the antenna, and dispenses with a special waterproof case for preventing the matching circuit. <P>SOLUTION: The matching circuit 16 connected to a mirror 22 (antenna) is mounted and grounded in a door mirror stay 40 composed of a conductor, inside of a matching circuit mounting part 60. Whereby the wiring of an electric wire and the like inside of a car body becomes unnecessary in the wiring work. Here, as the door mirror stay 40 is fixed to the car body in a state of being electrically conducted to the car body, the matching circuit 16 is directly grounded at a position near the mirror 22 with respect to the inside of the door 12. Further the matching circuit mounting part 60 accommodating the matching circuit 16 inside is covered by a seal material 64, the waterproof of the matching circuit 16 can be achieved. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle door mirror device.
[0002]
[Prior art]
Some vehicles such as automobiles include, for example, a TPMS (tire pressure monitoring system) for monitoring tire pressure and an RKE (remote keyless entry device) for remotely controlling unlocking and locking of a door. This type of TPMS or RKE operates by receiving a transmission radio wave from outside the vehicle compartment.
[0003]
Here, as a receiving device for receiving such a transmission radio wave, there is a receiving device provided with an antenna inside a mirror. In this receiver, a mirror reflection film of a mirror is applied as an antenna. This antenna is connected to a matching circuit for adjusting the impedance on the antenna side, a tuner for converting the transmission radio wave received by the antenna into a signal decoded by a CPU or the like, and the like, which is mounted inside the vehicle body, via an electric wire or the like. (Patent Document 1). When the impedance on the antenna side is adjusted by the matching circuit and the antenna receives a transmission radio wave from outside the vehicle, the transmission radio wave is converted into a signal decoded by the CPU or the like by the tuner, and the TPMS or RKE is operated as described above. Configuration. When these matching circuits and tuners are stored inside the vehicle door mirror device, the matching circuits and tuners are stored in a special waterproof case to protect them from water drops in rainy weather, and this waterproof case is also used. Is grounded to the vehicle body by wires or the like arranged inside the vehicle body from the mounting position.
[0004]
However, in such a conventional door mirror device for a vehicle, it is necessary to connect an antenna and a matching circuit or to route wires and the like for connecting the antenna and the tuner from the antenna to the inside of the vehicle body. It becomes necessary to arrange a wire or the like for grounding the tuner inside the vehicle body, and there is a drawback that such a routing operation is complicated and the antenna gain is reduced. Further, in this case, since the position where the matching circuit and the tuner are grounded is inside the vehicle body, there has been a problem that the receiving efficiency of the antenna is deteriorated. In addition, when the matching circuit and the tuner are stored inside the vehicle door mirror device, a special waterproof case for waterproofing the matching circuit and the tuner is indispensable, so that the number of parts increases and the cost increases. The problem had arisen.
[0005]
[Patent Document 1]
JP 10-166946 A
[Problems to be solved by the invention]
In view of the above problems, the present invention not only can receive a predetermined transmission radio wave emitted from outside the vehicle compartment, but also provides a work for connecting the antenna and the matching circuit and grounding the matching circuit. An object of the present invention is to provide a door mirror device which facilitates a routing operation, improves antenna gain and reception efficiency, and does not require a special waterproof case for waterproofing a matching circuit.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is directed to the mirror body in which an antenna for receiving a transmission radio wave from outside of the vehicle is built, and the mirror body is a conductor and supports the mirror body and is electrically connected to the vehicle body in a state where the mirror body is electrically connected to the vehicle body. A door mirror stay to be fixed, a sealing material for waterproofing between the door mirror stay and the vehicle body, and a door mirror stay waterproofed by the sealing material attached to a portion of the door mirror stay on the vehicle body side, connected to the antenna and A matching circuit that is grounded to the door mirror stay and adjusts the impedance on the antenna side.
[0008]
According to the first aspect of the present invention, the matching circuit connected to the antenna is attached to a portion of the door mirror stay, which is a conductor, on the vehicle body side, and is grounded to the door mirror stay. This eliminates the need to route wires and the like for connecting the antenna and the matching circuit from the antenna to the inside of the vehicle body, and also to route wires and the like for grounding the matching circuit inside the vehicle body. Is unnecessary, so that the work for connecting the antenna and the matching circuit and the work for grounding the matching circuit are facilitated. Further, in this case, since the door mirror stay is fixed to the vehicle body in a state of being electrically connected to the vehicle body, the matching circuit can directly take a wide ground, and the antenna gain is improved. Further, since the position where the matching circuit is grounded is closer to the antenna than inside the vehicle body, the receiving efficiency of the antenna is improved. Further, the matching circuit is attached to a portion of the door mirror stay on the vehicle body side, and the portion on the vehicle body side is waterproofed by the seal material, so that a special waterproof case for waterproofing the matching circuit is not required.
[0009]
According to a second aspect of the present invention, in the first aspect of the present invention, a tuner for converting the transmission radio wave received by the antenna into a predetermined signal is provided together with the matching circuit.
[0010]
According to the second aspect of the present invention, since the tuner is provided together with the matching circuit, the configuration of the device is simplified. In this case, it is not necessary to route wires and the like for connecting the antenna and the tuner from the antenna to the inside of the vehicle body, and it is not necessary to route wires and the like for grounding the tuner inside the vehicle body. Therefore, the work of connecting the antenna and the tuner and the work of grounding the tuner are facilitated. Further, since the tuner is provided together with the matching circuit, the tuner is waterproofed by the sealing material together with the matching circuit, so that a special waterproof case for waterproofing the tuner becomes unnecessary.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a schematic view of an automobile provided with a door mirror device 10 according to an embodiment of the present invention when viewed from the rear of the vehicle.
[0012]
The door mirror device 10 is provided to protrude outward from a door 12 of an automobile. The reference numeral 11 in FIG. 1 indicates a tire.
[0013]
FIG. 2 is an exploded perspective view of the door mirror device 10. The door mirror device 10 includes a mirror body 18 and a door mirror stay 40 that supports the mirror body 18.
[0014]
The mirror body 18 includes a frame 14 for mounting components. The frame 14 has a concave shape on the vehicle front side and the vehicle rear side by performing drawing on a frame forming metal plate (for example, an iron plate) formed by pressing. A mirror angle adjusting device 20 holding a mirror 22 for recognizing the rear of the vehicle in a swingable manner is attached to the rear of the frame 14 in the vehicle. The mirror 22 has a specular reflection film, and is applied as an antenna for receiving a transmission radio wave from outside the vehicle compartment. The mirror 22 is used to receive a transmission radio wave used for, for example, a TPMS (tire pressure monitoring system) or an RKE (remote keyless entry device). As an antenna for receiving such a transmission radio wave from outside the vehicle compartment, a metal frame may be used as an antenna in addition to using the mirror reflection film as an antenna, or an antenna may be separately arranged inside the door mirror device. You may.
[0015]
The mirror body 18 is provided with a case member 38 for attaching the mirror body 18 to a door mirror stay 40. The case member 38 is housed inside the door mirror visor 50 together with the frame 14 and the mirror surface angle adjusting device 20. The door mirror visor 50 is configured by fitting a visor cover 52 on the front side of the vehicle and a visor rim 54 on the rear side of the vehicle, and is fixed to the frame 14 together with the case member 38.
[0016]
The door mirror body 18 described above is supported by the door mirror stay 40. The door mirror stay 40 is made of a conductor such as ZDC (zinc die-cast) or ADC (aluminum die-cast), has a floor portion 34 on the outside of the vehicle, and has a substantially triangular plate on the inside of the vehicle (door 12 side). The body 58 is provided. The floor portion 34 is integrally provided with a cylindrical support shaft 36, and the support shaft 36 stands upright on the vehicle with respect to the floor portion 34. Since the support shaft 36 is inserted into the case member 38 of the mirror main body 18, the case member 38 is rotatable around the axis of the support shaft 36 of the door mirror stay 40. By rotating the case member 38 around the axis of the support shaft 36, the mirror main body 18 is stored or raised.
[0017]
On the other hand, the plate-shaped body 58 is erected with respect to the floor 34 with the plate thickness direction of the plate-shaped body 58 being the vehicle inner side direction. Further, the plate-shaped body 58 is provided integrally with a substantially triangular prism-shaped matching circuit mounting portion 60 protruding inward of the vehicle. The vehicle inner end of the matching circuit mounting portion 60 is open, and the inside is hollow. A matching circuit 16 for adjusting the impedance on the mirror 22 (antenna) side is stored inside the matching circuit mounting portion 60.
[0018]
The matching circuit 16 adjusts the impedance on the side of the mirror 22 (antenna) so that the transmitted radio wave can be most efficiently received at the frequency of the transmitted radio wave from outside the vehicle compartment. Further, a high frequency circuit (tuner) for converting a transmission radio wave received by the mirror 22 into a signal decoded by a CPU (not shown) or the like provided inside the door 12 is provided together with the matching circuit 16. . That is, the matching circuit 16 is combined with a tuner.
[0019]
As shown in FIG. 3, when the plate-like body 58 is viewed from the inside of the vehicle, the matching circuit 16 described above is directly attached to the door mirror stay 40 by the screw 62 inside the matching circuit mounting portion 60. The door mirror stay 40 is a ground destination of the matching circuit 16. That is, the matching circuit 16 is directly attached to the inside of the vehicle of the door mirror stay 40 and is grounded to the door mirror stay 40. The matching circuit 16 is connected to the mirror 22 as an antenna via a coaxial cable 15 via a resistor and a capacitor (not shown) and transmits a signal to the outside of the door mirror device 10 via a coaxial cable 66. Has become.
[0020]
A seal member 64 for waterproofing between the door mirror stay 40 and the door 12 is fixed inside the vehicle of the door mirror stay 40. The seal member 64 is shaped so as to cover the matching circuit mounting portion 60, and covers the inside of the door mirror stay 40 inside the vehicle. This protects the matching circuit 16 attached to the door mirror stay 40 from water drops.
[0021]
An insertion hole 65 for inserting the coaxial cable 66 is formed in the sealing material 64. The coaxial cable 66 attached to the matching circuit 16 passes through the insertion hole 65 of the sealing material 64 and is drawn out to the door 12 side, and a signal is transmitted to the CPU connected to the terminal 68 of the coaxial cable 66. .
[0022]
As shown in FIG. 4 (a cross-sectional view taken along the line 4-4 in FIG. 3), the inside of the door mirror stay 40 is fixed to the door 12. The door mirror stay 40 is attached to the door 12 by inserting the screw 12 into the door 12 and the sealing material 64 and screwing the screw 70 into the screw screw receiver 72 of the door mirror stay 40. The door 12 is in contact with the door 12. Here, as shown in FIG. 5, the door mirror stay 40 is fixed to the door 12 such that the seal member 64 and the door 12 are sandwiched between the door mirror stay 40 and the head of the screw 70. The screw 70 has conductivity, and the door mirror stay 40 is fixed to the door 12 while being electrically connected to the door 12. In order to fix the door mirror stay 40 described above to the door 12, a bolt stud may be projected from the screw screw receiver 72 and fixed with a nut.
[0023]
Hereinafter, the operation of the door mirror device 10 according to the present embodiment will be described.
[0024]
As shown in FIGS. 2 and 3, the matching circuit 16 connected to the mirror 22 as an antenna is housed inside the matching circuit mounting portion 60 and is a conductor inside the door mirror stay 40 inside the vehicle (door). 12) and is grounded to the door mirror stay 40. Accordingly, it is not necessary to route the coaxial cable 15 for connecting the mirror 22 and the matching circuit 16 from the mirror 22 to the inside of the door 12, and it is also necessary to provide an electric wire or the like for grounding the matching circuit 16. It is not necessary to arrange the inside of the door 12. This facilitates the work of connecting the mirror 22 and the matching circuit 16 and the work of grounding the matching circuit 16. In this case, as shown in FIG. 5, the door mirror stay 40 is fixed to the door 12 while being electrically connected to the door 12, and the matching circuit 16 is grounded to the door mirror stay 40. The matching circuit 16 is grounded to the door 12, as shown in FIG. For this reason, the matching circuit 16 can directly take a wide ground, and the antenna gain is improved. Furthermore, since the position where the matching circuit 16 is grounded is closer to the mirror 22 as an antenna than the inside of the door 12, the reception efficiency of the antenna is improved. As shown in FIGS. 2 and 3, since the matching circuit mounting portion 60 in which the matching circuit 16 is stored is waterproofed by the seal member 64, a special waterproof case for waterproofing the matching circuit 16 is provided. Becomes unnecessary.
[0025]
Further, since the tuner is provided together with the matching circuit 16, the configuration of the device is simplified. Further, in this case, it is not necessary to route wires and the like for connecting the mirror 22 as an antenna to the tuner from the mirror 22 to the inside of the vehicle body, and route wires and the like for grounding the tuner inside the vehicle body. This eliminates the necessity of performing this operation, which facilitates the work of connecting the mirror 22 and the tuner and the work of grounding the tuner. Further, since the tuner is provided together with the matching circuit 16, the tuner is waterproofed by the seal member 64 together with the matching circuit 16, so that a special waterproof case for waterproofing the tuner becomes unnecessary.
[0026]
【The invention's effect】
As described above, in the door mirror device according to the present invention, not only can a predetermined transmission radio wave emitted from the outside of the vehicle compartment be received, but also the work for connecting the antenna and the matching circuit and the matching circuit are grounded. In this case, the work of arranging becomes easy. Further, the matching circuit can directly take a wide ground, and the antenna gain is improved. Further, since the position where the matching circuit is grounded is closer to the antenna than inside the vehicle body, the receiving efficiency of the antenna is improved. Further, a special waterproof case for waterproofing the matching circuit is not required.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a positional relationship between a door mirror device and a vehicle body when the automobile according to the present embodiment is viewed from the rear of the vehicle.
FIG. 2 is an exploded perspective view of the door mirror device according to the embodiment.
FIG. 3 is a diagram showing a correspondence between a plate-shaped body and a sealing material according to the present embodiment.
FIG. 4 is a cross-sectional view taken along line 4-4 in FIG. 3, showing a portion where the door mirror stay according to the present embodiment is in contact with the door.
FIG. 5 is an enlarged view showing a portion where the door mirror stay according to the present embodiment is in contact with the door and in the vicinity of a screw in FIG. 4;
[Explanation of symbols]
10. Door mirror device (Vehicle door mirror device)
12 door (body)
15 Coaxial cable 16 Matching circuit (matching circuit, tuner)
18 Mirror body 22 Mirror (antenna)
40 door mirror stay 58 plate 60 alignment circuit mounting part 62 screw 64 sealing material 70 screw screw 72 screw screw receiver

Claims (2)

A mirror body with a built-in antenna for receiving radio waves transmitted from outside the vehicle,
A door mirror stay fixed to the vehicle body in a state where the conductor is a conductor and supports the mirror body and is electrically connected to the vehicle body;
A sealing material for waterproofing between the door mirror stay and the vehicle body,
A matching circuit that is attached to a portion of the door mirror stay waterproofed by the seal material on the vehicle body side, is connected to the antenna and is grounded to the door mirror stay, and adjusts the impedance of the antenna side;
A vehicle door mirror device comprising: 2. The vehicle door mirror device according to claim 1, wherein a tuner for converting the transmission radio wave received by the antenna into a predetermined signal is provided together with the matching circuit.

Images