JP2004130875A - Door mirror device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a door mirror device capable of not only receiving the specified transmitted waves emitted from outside the cabin and but also equipped with a function as a receiving antenna having an enhanced reception intensity. <P>SOLUTION: The door mirror device for a vehicle serves also as an antenna whose frame 14 otherwise working as shutting off the transmitted waves can receive the transmitted waves, and thereby there is no object to shut off the waves, which leads to enhancement of the reception intensity of the waves. The frame 14 bears also the role to mount component(s) as well as is given a function as antenna, which can suppress the number of components of the door mirror device 10. <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 an antenna for receiving such a transmission radio wave, there is an antenna provided inside a door mirror (Patent Document 1). This antenna is fixed to the inner wall surface of the enclosure of the door mirror, and is connected to a tuner that finely adjusts the frequency of the received transmission radio wave. When an antenna receives a transmitted radio wave from outside the vehicle, the frequency of the transmitted radio wave is finely adjusted by a tuner, and the TPMS and RKE are operated as described above.
[0004]
However, in such a conventional antenna fixed to the inner wall surface of the enclosure of the door mirror, the transmission radio wave from outside the vehicle compartment is blocked by the frame inside the door mirror, so that the reception strength of the transmission radio wave is reduced. There was a disadvantage. In this case, it is conceivable to add an antenna inside the door mirror to improve the reception strength of the transmission radio wave.However, there is almost no space inside the door mirror to add an antenna, and it is necessary to add an antenna. Had become difficult.
[0005]
[Patent Document 1]
JP-A-11-42977
[Problems to be solved by the invention]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a door mirror device having a function as a receiving antenna with improved reception strength, in addition to being able to receive a predetermined transmission radio wave emitted from outside the vehicle compartment. .
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is a vehicle door mirror device provided with a conductive frame for mounting components, which is provided to protrude outward from a vehicle door, wherein the frame is configured to transmit a radio wave transmitted from outside the vehicle compartment. The antenna is applied as an antenna for receiving
[0008]
According to the first aspect of the present invention, since the frame that has functioned to block the transmission radio wave from outside the vehicle cabin is applied as an antenna for receiving the transmission radio wave, there is no obstacle to block the transmission radio wave, and the transmission radio wave is eliminated. The reception strength can be improved. In addition, the number of components of the door mirror device can be reduced by providing the frame with the role of attaching components and the function of an antenna.
[0009]
According to a second aspect of the present invention, in the first aspect, a tuner for finely adjusting the frequency of the transmission radio wave is connected to the frame, and the tuner is grounded to a vehicle body.
[0010]
According to the second aspect of the present invention, since the vehicle body is sufficiently larger than the door mirror device, it is suitable as a grounding destination for a tuner connected to the frame. Therefore, a wide ground can be obtained by grounding the tuner to the vehicle body. In addition, by connecting the tuner to the frame, workability during assembly is improved. In this case, when the tuner is connected to the frame, electrical connection using screws or the like is also possible.
[0011]
According to a third aspect of the present invention, in the second aspect of the present invention, a feeding point between the frame and the tuner is provided on the vehicle body side of the frame.
[0012]
According to the third aspect of the present invention, by providing the feeding point on the vehicle body side of the frame, this frame becomes an antenna equivalent to a monopole antenna, and the frame can be made a non-directional antenna. Therefore, this frame is effective as an antenna for receiving a transmission radio wave used in, for example, TPMS or RKE, that is, a receiving antenna for a transmission radio wave transmitted from any direction.
[0013]
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. Here, a positional relationship between a door mirror device 10 and a door 12 (vehicle body) of an automobile having a tire 11 is shown.
[0014]
The door mirror device 10 is provided so as to protrude outward from a door 12 of the vehicle, and is attached to the door 12 near the driver's seat and the door 12 near the passenger's seat. Inside the door mirror device 10, a frame 14 for mounting components is provided.
[0015]
FIG. 2 is an enlarged view of the frame 14 when the door mirror device 10 is viewed from the rear of the vehicle. The frame 14 is formed by pressing a frame-forming metal plate (for example, an iron plate) formed by pressing to have a concave shape on the front side and the rear side of the vehicle, and has conductivity. are doing.
[0016]
Here, the frame 14 is applied as an antenna for receiving a transmission radio wave from outside the vehicle compartment, and can receive a transmission radio wave used for, for example, a TPMS (tire pressure monitoring system) or a RKE (remote keyless entry device). . It is optimal that the length of the frame 14 in the longitudinal direction (dimensions in the vehicle inside direction and the vehicle outside direction) is, for example, 20 to 25 cm.
[0017]
As shown in FIG. 1, inside the door mirror device 10, a tuner 16 for finely adjusting the frequency of the received transmission radio wave is connected to the frame 14.
[0018]
FIG. 3 is a cross-sectional view showing an arrangement position of the frame 14 and the tuner 16 when the door mirror device 10 is viewed from the rear of the vehicle. Here, a feeding point 17 between the frame 14 and the tuner 16 is provided on the door 12 side of the frame 14.
[0019]
A tuner 16 is connected via a coaxial cable 15 to the end of the frame 14 in the vehicle inside direction and below the vehicle (the lower side in FIG. 3). . That is, the feeding point 17 between the frame 14 and the tuner 16 is on the door 12 side of the frame 14. The coaxial cable 15 is connected at a feeding point 17 by screwing a screw (not shown) into a screw hole formed in the frame 14. It is possible to change the position of the power supply point 17 above and below the vehicle. By changing the position of the power supply point 17 above and below the vehicle, the direction of the receivable transmission radio wave can be changed, which is effective when the reception direction of the transmission radio wave is known in advance.
[0020]
The frame 14 is entirely plated except for the screw holes. Although the plated portion has no conductivity, but the screw hole has conductivity, a signal corresponding to a transmission radio wave received via the screw hole, the screw, and the coaxial cable 15 is transmitted from the frame 14. Is transmitted to the tuner 16.
[0021]
As shown in FIG. 4 (a cross-sectional view along line 4-4 in FIG. 3), the tuner 16 is disposed at the center of the door mirror device 10 at the front and rear of the vehicle.
[0022]
The tuner 16 is connected to the door 12 by arranging a grounding conductive cable 19 from a power supply point 17 and the door 12 is used as a ground. That is, the tuner 16 is grounded to the door 12, and the door mirror device 10 is connected to the power supply point 17 (see FIG. 3) in order to connect the tuner 16 and the door 12 by pulling out the conductive cable 19 from the door mirror device 10. (Not shown), and this conductive cable 19 is inserted therethrough.
[0023]
When the tuner 16 is attached at a position as shown in FIG. 3, the tuner 16 may be electrically connected to the frame 14 by a screw directly without using the coaxial cable 15. In this case, the fixing of the tuner 16 and the electrical connection to the frame 14 can be simultaneously performed by the screws, and the coaxial cable 15 is not required. Therefore, only the wiring for the ground can be used.
[0024]
Hereinafter, the operation of the door mirror device 10 according to the present embodiment will be described.
[0025]
Since the frame 14 has conductivity, the frame 14 that has functioned to block transmission radio waves from outside the vehicle compartment is applied as an antenna for receiving transmission radio waves. Thus, there is no obstruction to the transmission radio wave, and the reception intensity of the transmission radio wave is improved.
[0026]
Further, since the door 12 is sufficiently larger than the door mirror device 10, it is suitable as a ground destination for the tuner 16 connected to the frame 14. Therefore, by grounding the tuner 16 to the door 12, a wide ground can be obtained. Further, by connecting the tuner 16 to the frame 14, workability at the time of assembly is improved. In this case, when the tuner 16 is connected to the frame 14, electrical connection using screws or the like is also possible. Further, by providing the feeding point 17 on the door 12 side of the frame 14, this frame 14 becomes an antenna equivalent to a monopole antenna. Thus, the frame 14 can be used as a non-directional antenna. Therefore, the frame 14 is effective as an antenna for receiving a transmission radio wave used in, for example, TPMS or RKE, that is, a receiving antenna for a transmission radio wave transmitted from any direction.
[0027]
In addition, the number of components of the door mirror device 10 can be reduced by providing the frame 14 with a role of attaching components and a function as an antenna.
[0028]
In the present embodiment, the tuner 16 is provided on the side of the door 12 of the frame 14. However, the power supply point 17 may be provided on the side of the door 12 of the frame 14. Not limited to
[0029]
For example, as in a door mirror device 18 shown in FIG. 5, in a cross-sectional view of the door mirror device 18 viewed from the rear of the vehicle, the power supply point 17 and the tuner 22 may be arranged apart from each other. In this case, the tuner 22 is provided at the center of the frame 20 in the vehicle inside direction and the vehicle outside direction and above the vehicle (upper side in FIG. 5), and the frame 20 and the tuner 22 are coaxial cables (not shown) with screws (not shown). To be connected through. As shown in FIG. 6 (a cross-sectional view taken along line 6-6 in FIG. 5), the tuner 16 may be provided at the vehicle rear of the frame 20 at the front and rear of the vehicle. In the door mirror device 18, the same operation and effect as those of the above-described embodiment (door mirror device 10) can be obtained.
[0030]
【The invention's effect】
As described above, in the door mirror device according to the present invention, it is possible to improve the reception intensity of the transmission radio wave from outside the vehicle compartment. In addition, the number of components of the door mirror device can be reduced by providing the frame with the role of attaching components and the function of an antenna.
[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 enlarged view of a frame when the door mirror device according to the present embodiment is viewed from the rear of the vehicle.
FIG. 3 is a sectional view showing an arrangement position of a frame and a tuner when the door mirror device according to the present embodiment is viewed from the rear of the vehicle.
FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. 3, showing a tuner arrangement position of the door mirror device according to the present embodiment.
FIG. 5 is a sectional view showing an arrangement position of a frame and a tuner when the door mirror device according to the present embodiment is viewed from the rear of the vehicle.
FIG. 6 is a sectional view taken along the line 6-6 in FIG. 5, showing an arrangement position of a tuner of the door mirror device according to the present embodiment.
[Explanation of symbols]
10. Door mirror device (Vehicle door mirror device)
12 door (body)
14 Frame 15 Coaxial cable 16 Tuner 17 Feed point 18 Door mirror device (Vehicle door mirror device)
19 Conductive cable 20 Frame 22 Tuner

Claims (3)

A vehicle door mirror device provided with a conductive frame for mounting components, which is provided to protrude outward from a vehicle door,
The frame was applied as an antenna for receiving a transmission radio wave from outside the vehicle,
A vehicle door mirror device characterized by the above-mentioned. A tuner for fine-tuning the frequency of the transmission radio wave was connected to the frame, and the tuner was grounded to a vehicle body.
The vehicle door mirror device according to claim 1, wherein: A power supply point for the frame and the tuner was provided on the vehicle body side of the frame,
The vehicle door mirror device according to claim 2, wherein:

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