JP2002084116A - In-vehicle antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate mounting an antenna on a vehicle body panel, even in a constitution that it guides out cables, approximately in parallel to the downside of an antenna base. SOLUTION: A guide plate 20 is disposed on the upsides of a signal cable 6 and a power cable 7, and both edges of the guide plate 20 are fitted in grooves 3e formed in notched grooves 3g of a base elongation 3a, so that the cables 6, 7 are guided out along through-holes 3d of the base elongation 3a. Thus, the cables 6, 7 and the base elongation 3a can be easily inserted in mounting holes of a vehicle body panel. After inserting them, a guide plate 20 is released from the grooves 3e and thereby the cables 6, 7 can be laid approximately in parallel on the backside of the vehicle body panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicular antenna suitable for use as a roof antenna mounted on a roof of a vehicle body.

[0002]

2. Description of the Related Art There are various types of antennas mounted on a vehicle body. However, if the antenna is mounted on the roof located at the highest position in the vehicle body, the receiving sensitivity can be increased. Preferred by In addition, since an FM radio and an AM radio are generally provided in the vehicle body,
Since an antenna that can receive both the M radio band and the AM radio band is convenient, a roof antenna that can receive two radio bands in common has become widespread.

[0003]

FIG. 10 shows a conventional example of such a roof antenna. In FIG. 10, the antenna 100 includes an element unit 111 and an element unit 1
11, an antenna top 112 attached to the tip of
Antenna base 1 provided at the lower end of element portion 111
13 is provided. The antenna unit is detachably attached to the antenna cover 102, and the antenna cover 102 is fitted to a conductive antenna base 103. A circuit board is housed in a space formed by the antenna cover 102 and the antenna base 3, and a duplexer and an amplifier are incorporated in the circuit board. A signal cable 106 and a power cable 107 are connected to the circuit board.
107 is led out through a through hole formed in a base extension provided on the lower surface of the antenna base 103.
A pad 104 made of a flexible material is mounted on the lower surface of the antenna base 103.

[0004] The antenna 100 thus configured is
It is attached to the roof of the vehicle, but the interior of the ceiling is decorated. By reducing the thickness of the interior, the interior space of the vehicle interior is expanded, so that the thickness of the interior of the ceiling in the interior of the vehicle is limited. By the way, when the cables 106 and 107 led out from the antenna 100 are led out from the lower surface of the base extension part extended from the lower surface of the antenna base 103, the cables 106 and 107 are led out in a direction orthogonal to the vehicle body panel 50. In consideration of the bending of the cables 106 and 107, a considerable thickness is required to store the cables 106 and 107 in the ceiling of the vehicle interior. Therefore, a notch is provided on the peripheral side surface of the base extending portion, and the cables 106 and 107 are led out from the notch, so that the cables 106 and 107 are led out substantially in parallel to the lower surface of the antenna base 103 as shown in FIG. Will be able to do it.

However, when the cables 106 and 107 are led out substantially in parallel to the lower surface of the antenna base 103, when the antenna 100 is mounted on the vehicle body panel 50, the antennas 100 are inclined as shown in FIG. Is inserted into the mounting hole formed in the vehicle body panel 50, and then the base extension is inserted into the mounting hole. At this time, the base extension hits the mounting hole and cannot be inserted, and the cables 106 and 107 are manually inserted. There is a problem that the base extension must be inserted by bending.

Accordingly, an object of the present invention is to provide an in-vehicle antenna in which the antenna can be easily attached to the vehicle body panel even when the cable is led out substantially in parallel to the lower surface of the antenna base.

[0007]

In order to achieve the above object, a vehicle-mounted antenna according to the present invention has an antenna cover in which an antenna element is mountable and a circuit board is housed at least inside. An antenna cover to be fitted into the conductive antenna base and a base extension portion extending from a lower surface of the antenna base, thereby screwing the vehicle body between the antenna base and the lower surface of the antenna base; Means, and a through-hole for guiding a cable connected to the circuit board to the outside is formed in the base extension, and a cutout groove reaching the through-hole is formed on a peripheral side surface of the base extension on the axis. It is formed almost along,
A groove in which a guide plate for guiding the cable is engaged,
It is formed in the notch groove.

[0008] In the above-mentioned vehicle-mounted antenna according to the present invention, by engaging the guide plate with the groove,
The cable penetrates the through hole, is drawn downward from the lower end of the base extension, and detaches the guide plate from the groove, so that the cable passes through the cutout groove and the lower surface of the antenna base. You may make it lead out substantially parallel. Still further, in the above-mentioned vehicle-mounted antenna of the present invention, the guide plate is formed in half so that the cable can be sandwiched, and a storage groove for housing the cable is formed in the half-cut surface, The front part and the rear part may be divided into two parts, and the part may be connected by a bendable connection part. Further, in the vehicle-mounted antenna according to the present invention, instead of the groove, the cutout groove reaching the through hole may be formed so as to gradually become narrower toward the outlet.

According to the present invention, a guide plate for guiding a cable is provided, and when the antenna is mounted, the cable can be vertically led out of the antenna by the guide plate. Can be easily inserted and mounted in the mounting hole formed in the above. In addition, by detaching the guide plate from the groove after mounting, the cable can be led out along the back side of the vehicle body panel, and the antenna can be mounted even in a narrow space where the thickness is not sufficiently secured. Become like Further, since the cable does not directly contact the edge of the mounting hole formed in the vehicle body panel but comes into contact with the guide plate, the cable can be protected from the edge formed at an acute angle. become able to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of a vehicle-mounted antenna according to an embodiment of the present invention, and FIG. 4 is an exploded perspective view thereof. As shown in FIGS. 1 and 4, the antenna 1 according to the embodiment of the present invention includes an element part 11, an antenna top 12 provided at a tip of the element part 11, and a lower end of the element part 11. An antenna unit including an antenna base 13 is provided. In the element part 11,
Helical projections are formed to prevent wind noise that is likely to occur during high-speed running. At the lower end of the antenna base 13, an antenna mounting screw 13a for mounting the antenna unit to the antenna cover 2 is formed so as to protrude. The antenna mounting screw 13a also serves as power supply for the antenna unit.

The antenna unit 13 is fixed to the antenna cover 2 by screwing the antenna mounting screw 13a to the mounting screw unit 2a provided at the upper end of the antenna cover 2.
A circuit board 31 is housed in the antenna cover 2, and the circuit board 31 incorporates a demultiplexing circuit and an amplification circuit that amplifies the demultiplexed received signal. A reception signal from the antenna section is guided to the circuit board 31 via the mounting screw section 2a. Circuit board 31 is grounding fitting 32
To the grounding metal 32 by soldering or the like.
Is fixed to the antenna base 3 by being fitted to a plurality of engagement protrusions 3b formed on the upper surface of the antenna base 3.

A ring-shaped protrusion 3c (see FIG. 6A) is formed around the upper surface of the conductive antenna base 3, and the antenna cover 2 is engaged with the ring-shaped protrusion 3d. A cylindrical base extension 3a is formed so as to protrude from the lower surface of the antenna base 3, and the outer peripheral surface of the base extension 3a is threaded. Also,
By inserting a pair of mounting screws 33 from the lower surface of the antenna base 3 into the antenna base 3 and screwing it to the antenna cover 2, the antenna base 3 and the antenna cover 2 are integrated and the formed closed The circuit board 31 and the earth fitting 32 are housed in the space.

The circuit board 31 is connected with a signal cable 6 for deriving a received signal output from the circuit board 31 and a power cable 7 for supplying power to the circuit board 31. The signal cable 6 and the power cable 7 are connected to a through hole 3d formed in the base extension 3a (see FIG. 6A).
And a cutout groove 3g (see FIG. 7B) formed on the peripheral side surface of the base extension 3a so as to reach the through hole 3d. At this time, the signal cable 6 and the power cable 7 are guided by the guide plate 20 to guide the direction of drawing out from the base extension 3a.
Although the details of this guide will be described later, when the antenna 1 is mounted on the vehicle body panel 50, the signal cable 6 and the power supply cable 7 are guided so as to be led out substantially orthogonally to the vehicle body panel 50, and after mounting. 1 guides the signal cable 6 and the power cable 7 to be led out substantially in parallel to the vehicle body panel as shown in FIG.

An O-ring 34 is provided at the base of the base extension 3a.
And a pad 4 made of a flexible material is fitted on the lower surface of the antenna base 3. Thereby, the antenna 1 can be attached to the vehicle body panel 50 in a watertight manner. The pad 4 has a through hole 4a into which the base extension 3a is inserted.
The base extension 3a, the signal cable 6 and the power cable 7 are inserted into the mounting holes formed in the vehicle body panel 50, and the signal cable 6 and the power cable 7 are arranged along the vehicle body panel 50. By screwing the antenna 5 to the base extension 3a, the antenna panel 3 can be attached to the vehicle body panel 50 by sandwiching the vehicle body panel 50 between the antenna base 3 and the washer nut 5. This state is the mounting state shown in FIG. The washer nut 5 includes a washer portion 5a having a sharp tip engaged with the back surface of the vehicle body panel 50, and a hexagonally-shaped nut portion 5b rotatably integrated with the washer portion 5a. . The washer portion 5a has a cable lead-out groove 5c for leading out the signal cable 6 and the power cable 7. Note that the lead-out portions of the signal cable 6 and the power cable 7 may be covered with a protective tube 8 for protecting the cable.

Next, FIGS. 2 and 3 show the mounting of the antenna 1 according to the embodiment of the present invention on the vehicle body panel 50, and FIGS.
7 through FIG. First, the configuration of the guide plate 20 is a rectangular plate having a small thickness as shown in FIGS. 5A and 5B, and is formed of a material having a certain degree of elasticity, such as a synthetic resin plate. . In this guide plate 20,
A step portion 20a is formed halfway, and FIGS. 6 (a) and 6 (b)
Are arranged above the signal cable 6 and the power cable 7 as shown in FIG.
At the same time, when inserted into the through hole 3d formed in the antenna base 3, the step portion 20a comes into engagement with the entrance of the notch groove 3g (see FIG. 7B). At this time, the leading end of the portion of the guide plate 20 whose width beyond the step portion 20a is narrowed penetrates the through hole 3d and is introduced into the antenna cover 2. As shown in FIGS. 6A and 6B, a groove 3e is formed in the notch groove 3g formed in the base extension 3a of the antenna base 3 substantially along the axis. Therefore,
When the guide plate 20 is bent together with the signal cable 6 and the power cable 7, both edges of the portion of the guide plate 20 whose width is increased from the step portion 20 a come into engagement with the groove 3 e. At this time, the step 20a of the guide plate 20 is brought into contact with the upper end of the groove 3e. This state is the state shown in FIGS.

FIG. 2 shows the antenna 1 in the state shown in FIGS. 7A and 7B, which is a state at the time of starting the mounting of the antenna 1. That is, as shown in FIG. 2, the signal cable 6 and the power cable 7, which are led out substantially orthogonally from the antenna base 3 of the antenna 1, are inserted into mounting holes 50 a formed in the vehicle body panel 50. Next, the base extension 3a of the antenna base 3 is inserted into the mounting hole 50a, and the rectangular portion 3f formed at the base of the base extension 3a is engaged with the rectangular mounting hole 50a. Thus, the antenna base 3 is prevented from rotating with respect to the mounting hole 50a. Thus, the base extension 3a,
The signal cable 6 and the power cable 7 can be easily inserted into the mounting holes 50a formed in the vehicle body panel 50.

Next, when the signal cable 6 and the power cable 7 are pulled in a direction of being led out from the notch groove 3g, both edges of the portion widened from the step portion 20a of the guide plate 20 are separated from the groove portion 3e. As shown in FIGS. 6A and 6B, the signal cable 6 and the power cable 7 are led out substantially in parallel to the lower surface of the antenna base 3. FIG.
FIG. 3 shows the antenna 1 in the states (a) and (b). In this state, the washer nut 5 is screwed into the base extension 3a from inside the vehicle body. In this case, since the antenna base 3 is prevented from rotating with respect to the mounting hole 50a,
It can be easily screwed. Further, the signal cable 6 and the power cable 7 are led to the outside from the cable lead-out groove 5c formed in the washer nut 5. In this case, the guide plate 20 comes into contact with the sharp edge of the mounting hole 50a formed in the vehicle body panel 50 to protect the signal cable 6 and the power cable 7, so that the outer cover of the signal cable 6 and the power cable 7 can be protected. Can be protected from damage.

Next, another embodiment of the guide plate will be described with reference to FIGS. 8 and 9. FIG. In another embodiment of the guide plate shown in FIG. 8, the guide plate 60 is formed in half, and is further divided into a front part 61 and a rear part 63, and the front part 61 and the rear part 63 are separated from each other. Bendable connection 6
2 are connected. The front part 61, which is cut in half,
The first front part 61a and the second front part 61b are joined and formed by a hinge part 61e, and the first front part 61a and the second front part 61b are formed.
Semi-circular grooves 61c, 61 are provided on the surface where the front portion 61b is fitted.
Two d's are formed. These grooves 61c and 61d are grooves for accommodating the signal cable 6 and the power cable 7. Also, the rear portion 63 that is cut in half is a first rear portion 63a.
And a second rear portion 63b are joined by a hinge portion 63f, and two semicircular grooves 63c and 63d are formed on a surface where the first rear portion 63a and the second rear portion 63b meet. These grooves 63c and 63d are also grooves for accommodating the signal cable 6 and the power cable 7. Further, the rear portion 63 is formed with a projection 63e that is divided into two portions. When the first rear portion 63a and the second rear portion 63b are combined, one projection is formed by the two projections 63e. I have.

The connecting portion 62 connecting the front portion 61 and the rear portion 63 is formed in a thin plate shape so as to be bendable. The guide plate 60 thus configured can be made by molding a synthetic resin. When using the guide plate 60, the signal cable 6 and the power cable 7 are placed in the grooves 61c and 61d and the grooves 63c and 63d, respectively, and the first front portion 61a and the second front portion 61b are hinged. The first rear portion 63a and the second rear portion 63b are bent together with the hinge portion 63f to be fitted together with the bent portion 61e. Thereby, the guide plate 60 is attached to the signal cable 6 and the power cable 7. Then, the signal cable 6 and the power cable 7 on which the guide plate 60 is mounted are connected to the through holes 3 d formed in the antenna base 3.
Through the antenna cover 2. here,
When the signal cable 6 and the power cable 7 are bent,
The connecting portion 62 of the guide plate 60 is bent, and the pair of protrusions 63e formed on the side end of the guide plate 20 is engaged with the groove 3e as shown in FIG. 9A. This state is the state shown in FIGS. 9A and 9B.

That is, as shown in FIGS. 9 (a) and 9 (b), the signal cable 6 and the power cable 7 are led out from the antenna base 3 of the antenna 1 almost at right angles, and together with the base extension 3a. It can be easily inserted into the mounting hole 50a formed in the vehicle body panel 50. Next, when the signal cable 6 and the power cable 7 are pulled in a direction of being led out from the notch groove 3g, the guide plate 6
The zero protrusion 63e is separated from the groove 3e, and the connecting portion 62 is straightened. As a result, the signal cable 6 and the power cable 7 are led out substantially in parallel to the lower surface of the antenna base 3. In this state, the antenna 1 can be attached to the vehicle body panel 50 by screwing the washer nut 5 to the base extension 3a from inside the vehicle body.

Next, a modification of the through hole 3d and the cutout groove 3g formed in the base extending portion 3a is shown in FIG. 9 (c). In this modification, the cross-sectional shape of the through-hole 3d and the cutout groove 3g reaching the through-hole 3d is formed such that the width gradually decreases toward the opening. Thus, it is possible to prevent the guide plate 60 from coming out of the cutout groove 3g without providing the groove 3e or the protrusion 63e. In this case, by slightly twisting the guide plate 60, the notch groove 3
The guide plate 60 can be pulled out of g. Note that, in the in-vehicle antenna of the present invention, the antenna portion is A
Although the antenna is a dual-band antenna for the M band and the FM band, the present invention is not limited to this, and it may be a triple-band antenna with a telephone band added.

[0022]

As described above, according to the present invention, the guide plate for guiding the cable is provided, and when the antenna is mounted, the cable can be guided vertically from the antenna by the guide plate. It can be easily inserted and mounted in a mounting hole formed in the vehicle body panel. In addition, by detaching the guide plate from the groove after mounting, the cable can be led out along the back side of the vehicle body panel, and the antenna can be mounted even in a narrow space where the thickness is not sufficiently secured. Become like Further, since the cable does not directly contact the edge of the mounting hole formed in the vehicle body panel but comes into contact with the guide plate, the cable can be protected from the edge formed at an acute angle. become able to.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a state in which a vehicle-mounted antenna according to an embodiment of the present invention is mounted on a vehicle body panel.

FIG. 2 is a diagram showing one state when the vehicle-mounted antenna according to the embodiment of the present invention is mounted on a vehicle body panel.

FIG. 3 is a diagram showing another state when the vehicle-mounted antenna according to the embodiment of the present invention is mounted on a vehicle body panel.

FIG. 4 is an exploded perspective view of the vehicle-mounted antenna according to the embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a guide plate according to the on-vehicle antenna according to the embodiment of the present invention.

FIG. 6 is a diagram for explaining a function of a guide plate according to the vehicle-mounted antenna according to the embodiment of the present invention.

FIG. 7 is another diagram for explaining the function of the guide plate according to the on-vehicle antenna according to the embodiment of the present invention.

FIG. 8 is a diagram showing another configuration example of the guide plate according to the vehicle-mounted antenna according to the embodiment of the present invention.

FIG. 9 is a diagram for explaining a function of another guide plate according to the vehicle-mounted antenna according to the embodiment of the present invention.

FIG. 10 is a diagram showing a configuration of a conventional vehicle-mounted antenna.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Antenna, 2 antenna cover, 2a mounting screw part, 3 antenna base, 3a base extension part, 3b
Engaging projection, 3c ring-shaped projection, 3d through hole, 3e
Groove, 3f Rectangular, 3g Notched groove, 4 pads, 4a
Through hole, 5 washer nut, 5a washer part, 5
b nut portion, 5c cable lead-out groove, 6 signal cable, 7 power cable, 8 protective tube, 11 element portion, 12 antenna top, 13 antenna base, 13a antenna mounting screw, 20 guide plate, 20a
Step, 31 Circuit board, 32 Grounding bracket, 33 Mounting screw, 34 O-ring, 50 Body panel, 50a
Mounting hole, 60 guide plate, 61 front, 61a first front, 61b second front, 61c groove, 61d groove, 61
e hinge part, 62 connection part, 63 rear part, 63a first rear part, 63b second rear part, 63c groove, 63d groove,
63e projection, 63f hinge part, 100 antenna,
102 antenna cover, 103 antenna base, 1
04 pad, 106 signal cable, 107 power cable, 111 element part, 112 antenna top, 113 antenna base

Claims (4)

[Claims] An antenna cover in which an antenna element is mountable and at least a circuit board is housed, a conductive antenna base to which the antenna cover is fitted, and a lower surface of the antenna base Screwing means for screwing the vehicle body between the antenna base and the lower surface of the antenna base by being screwed to the base extending portion; and a guide for guiding the cable connected to the circuit board to the outside A through-hole for guiding the cable to the outside is formed in the base extension, and a cutout groove reaching the through-hole is formed in a peripheral side surface of the base extension along the axis. A vehicle-mounted antenna, wherein a groove portion with which the guide plate for guiding the cable engages is formed in the cutout groove. 2. By engaging the guide plate with the groove, the cable penetrates the through hole, is led downward from the lower end of the base extension, and detaches the guide plate from the groove. 2. The on-vehicle antenna according to claim 1, wherein the cable is led out substantially in parallel with the lower surface of the antenna base through the cutout groove. 3. The guide plate is formed so as to be half cut so as to be able to hold the cable, a storage groove for storing the cable is formed in the half cut surface, and two front and rear portions are provided. The on-vehicle antenna according to claim 1, wherein the antenna is divided and connected by a bendable connection portion. 4. The on-vehicle antenna according to claim 1, wherein, instead of the groove, the notch reaching the through hole is formed so as to gradually decrease in width toward an outlet.