JP3513070B2 - Automotive 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-mounted antenna mounted on a roof of 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 can be a suitable antenna as a vehicle-mounted antenna because the antenna is located at a high place and the roof can be used as a ground plane. Also,
In order to prevent the antenna from easily breaking when the antenna comes into contact with an obstacle during driving and breaks, or when the vehicle is parked, the in-vehicle antenna attached to the vehicle body is not damaged. It has a removable structure.

In a vehicle-mounted antenna in which the antenna part is detachable from the antenna base, a metal member for fixing the antenna part to the antenna cover so that the antenna part can be screwed is provided. This metal fitting is integrally insert-molded when the antenna cover is molded. However, since the antenna cover and the metal fitting are made of different materials, the coefficients of thermal expansion are different, and a minute gap is generated at the boundary between the insert-molded metal fitting and the antenna cover. Then, rainwater or the like may enter the antenna cover through this gap and cause rust or the like on the metal fittings or the circuit board inside the antenna cover, which may render the in-vehicle antenna inoperable or cause rainwater to enter the vehicle interior. Will occur.

[0004]

Therefore, in order to solve this, conventionally, an adhesive agent made of silicon or the like is applied to the boundary portion between the insert-molded metal fitting and the antenna cover for waterproofing. However, there is a problem that the application of the adhesive is a manual work, and the adhesive application process and the drying process take time, so that it cannot be performed in a line work. Further, it is necessary to remove the adhesive attached to the extra portion, and it is difficult to obtain the desired effect unless the adhesive is applied thickly. Therefore, the waterproofing work requires a long time.

As a waterproof measure, the antenna cover is also insert-molded with the O-ring inserted in the metal fitting. Such a waterproof structure is shown in FIG. 8, and an insert fitting 111 is integrally formed with the antenna cover 110 made of synthetic resin. An O-ring 112 is fitted on the peripheral side surface of the insert fitting 111. In such a waterproof structure, the O-ring 11
There was a problem that the defective filling of the resin material around the circumference of 2 was likely to occur and the quality was not constant. Further, there is a problem that when a filling failure occurs, there is no inspection method for maintaining the quality, which is not suitable for mass production.

Therefore, an object of the present invention is to provide a vehicle-mounted antenna which can easily have a waterproof structure even if metal fittings made of different materials are insert-molded on the antenna cover.

[0007]

In order to achieve the above object, a vehicle-mounted antenna according to the present invention is a vehicle-mounted antenna comprising an antenna section and an antenna base to which the antenna section is detachably mounted, the antenna base includes an antenna cover that inside is the storage space, said Ann
Base metal fitted to close the bottom surface of the tenor cover
At least, and an insert fitting is formed on the antenna cover so as to penetrate the antenna cover so that the antenna section can be detachably attached.
And is inserted into the insert fitting protruding into the antenna cover and the inside of the antenna cover .
The part side is in contact with the step of the insert fitting ,
Straddle the step of the antenna cover and the insert
The O-ring is stored in a watertight manner in the mounting groove formed as described above . Further, in the vehicle-mounted antenna of the present invention,
A circuit board is accommodated in the antenna cover, and the antenna part and the antenna part are connected to each other by a connection fitting attached to the insert fitting protruding into the antenna cover so as to press the O-ring into the mounting groove. It may be connected to a circuit board.

Further, another vehicle-mounted antenna of the present invention which can achieve the above object is a vehicle-mounted antenna comprising an antenna portion and an antenna base to which the antenna portion is detachably attached. The base is
Antenna cover having a storage space inside, and the antenna
A circuit board housed in a cover and supplied with a signal from the antenna section, and a connection fitting attached to the insert fitting protruding into the antenna cover so as to connect the antenna section and the circuit board. And the above
The antenna cover is fitted so as to close the lower surface of the antenna cover , and a base metal fitting into which a plurality of cables can be introduced is provided.
Penetrates the antenna cover so that it can be detachably attached
Insert metal fittings are molded to
Insert it into the insert fitting protruding inside the tenor cover.
And the inside of the antenna cover is
The antenna cover is attached to the part that contacts the step of the sart metal fittings.
And is formed to straddle the step of the insert metal fitting
The O-ring is housed in the mounting groove in a watertight manner, and the ground portion of the first cable introduced into the antenna cover via the base metal fitting is fixed to the ground connecting metal fitting fixed to the circuit board. In addition, the core wire having the folded portion is connected to the circuit board so as to guide the signal supplied to the circuit board, and the second cable introduced into the antenna cover through the base metal fitting is S. It is inserted into a guide portion bent into a letter shape, and its core wire is connected to the circuit board.

According to the present invention as described above, in the insert fitting molded to penetrate the antenna cover,
Since the O-ring is inserted into the insert fitting protruding into the antenna cover and the O-ring is housed in the mounting groove formed by the antenna cover and the insert fitting in a watertight manner, the insert fitting and the antenna cover Even if a gap is formed at the boundary, rainwater or the like that tries to enter through the gap is prevented from further entering by the O-ring in the mounting groove. This can prevent rainwater or the like from entering the antenna cover.
Further, since no adhesive or the like is used and the O-ring has a structure in which it is not molded, it is possible to easily realize a waterproof structure.

Furthermore, in a plurality of cables led out from the circuit board housed in the antenna cover, the earth portion of the cable is fixed to the earth connecting metal fitting, and the folded portion is formed on the core wire to allow a sufficient length. Since the cable is provided, it is possible to prevent disconnection of the cable when tension is applied to the cable. Further, by inserting the cable into the bent guide portion, it is possible to prevent the cable from breaking when tension is applied to the cable.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the overall configuration of an on-vehicle antenna according to an embodiment of the present invention. The vehicle-mounted antenna 100 shown in FIG. 1 includes an antenna unit 1 in which a helical antenna is housed, and an antenna base 2 to which the antenna unit 1 is detachably attached. A resin antenna cover is attached to the antenna portion 1 to form a flexible antenna element. A rubber pad 3 for watertightly attaching to the vehicle body is fitted to the lower surface of the antenna base 2, and a plurality of mounting bolts 4 extend from a base metal fitting (not shown) provided on the lower surface of the antenna base 2. There is. Further, a coaxial cable 5 for signal transmission and a vinyl coated wire 6 for power supply, which are introduced into the vehicle body, are led out from the base metal fitting. Such a vehicle-mounted antenna 100 is fixed to, for example, a mounting hole provided on the roof of the vehicle body by screwing a mounting nut onto the mounting bolt 4.

FIG. 2 is a sectional view showing the detailed structure of the antenna base in the vehicle-mounted antenna according to the present invention shown in FIG. As shown in FIG. 2, the antenna base 2 is composed of an antenna cover 10 made of resin and a base metal fitting 7 fitted to the lower surface of the antenna cover 10. A rubber pad 3 is provided on the lower surface of the antenna base 2 to which the base metal fitting 7 is fitted. An insert metal fitting 11 is insert-molded in the antenna cover 10 when the antenna cover 10 is molded, and the insert metal fitting 11 is formed with an antenna mounting screw portion to which the antenna portion 1 is screwed. Further, the lower part of the insert metal fitting 11 projects into the antenna cover 10, and after the O-ring 12 is fitted and inserted into this projection portion, the bent plate-shaped connecting metal fitting 14 is inserted and the mounting nut 13 is used. It is installed.

These parts are shown enlarged in FIG.
The waterproof structure will be described with reference to. The O-ring 12 fitted into the insert fitting 11 is housed in the mounting groove formed at the boundary between the insert fitting 11 and the antenna cover 10. The O-ring 12 is attached to the insert fitting 11 by the mounting nut 13. Attached fitting 14
As a result, it comes to be pressed into the mounting groove. This allows
Even if a gap is created at the boundary between the insert fitting 11 and the antenna cover 10, the O-ring 12 that is pressed and crushed will occupy the inside of the mounting groove, so that the O-ring 12 cannot further penetrate and is waterproof. Become. As described above, in the present invention, the O-ring 12 fitted into the insert fitting 11 is housed in the fitting groove formed at the boundary between the insert fitting 11 and the antenna cover 10 and pressed into the fitting groove. Be able to waterproof. It should be noted that the O-ring 12 is not limited to being pressed by the connection fitting 14, but may be a washer fitted in the insert fitting 11.

Further, the antenna cover 10 and the base metal 7 form a storage space inside the antenna cover 10, and the circuit board 15 is stored in this storage space. The end of the connection fitting 14 attached to the insert fitting 11 is connected to the circuit board 15 so that the signal received from the antenna unit 1 is guided to the circuit board 15. Circuit board 1
5 has a demultiplexer and an amplifier if necessary,
The demultiplexed signal of the mobile telephone band is led to the coaxial cable 5, and the demultiplexed signal of the AM / FM band is amplified and synthesized as necessary and led to the coaxial cable 5. Power for operation is supplied to the circuit board 15 by the vinyl coated wire 6. The relationship between the circuit board 15 and the coaxial cable 5 and the vinyl coated wire 6 is enlarged and shown in FIG. This will be described below with reference to FIG.

The distal end portion of the coaxial cable 5 from which the outer cover is removed is inserted into the pipe-shaped grounding metal fitting 20 from below, and the punching portion 2 is provided at, for example, four locations along the circumference of the grounding metal fitting 20.
The coaxial cable 5 is fixed to the grounding member 20 by punching and crimping 0c. This earth metal fitting 2
A flange portion 20b is formed on the upper part of 0 to connect the ground connection fitting 2
The front end of the grounding metal fitting 20 is crimped to form a caulking portion 20a that contacts the front surface of the grounding metal fitting 22. As a result, the ground metal fitting 20
Is fixed to the ground connection fitting 22. The ground connection fitting 22 includes a first side wall portion 22a, which has a U-shaped cross section and is bent at substantially right angles on both sides, and a second side wall portion (not shown). The attached piece penetrates the circuit board 15 and is fixed to the circuit board 15 by soldering or the like. Further, the core wire 5a of the coaxial cable 5 pulled out from the ground connection fitting 22 is formed with a folded-back portion 19 which will be described later and is soldered to the circuit board 15 with a margin in length (solder portion 16). Has been done. Further, the vinyl coated wire 6 is inserted and held in a guide portion 17 having a guide hole bent in an S shape, and its core wire is soldered to the circuit board 15 (solder portion 16).

As a result, when tension is applied to the coaxial cable 5, the earth metal fitting 20 can reliably withstand the tension, and even if the core wire 5a is slightly pulled and moved, the core wire 5a absorbs it and the coaxial cable 5 absorbs it. Core wire 5
It is possible to prevent disconnection of a. Further, even if tension is applied to the vinyl-coated wire 6, the vinyl-coated wire 6 is held in the guide portion 17 bent into an S shape, and the core wire can be prevented from being broken. The guide unit 1
7 is configured to be cut in half, and after the vinyl covered wire 6 is sandwiched between the guide portions 17 and assembled, the vinyl covered wire 6 is fitted into a pair of opposed holders formed in the ground connection fitting 22. As a result, the half-divided guide portion 17 is pressed into contact with the holder, and the vinyl-coated wire 6 can be reliably held by the guide portion 17.

Returning to FIG. 2, a base metal fitting 7 is fitted to the antenna cover 10 so as to close the lower surface of the antenna cover 10. At this time, the protrusion 18 formed on the inner surface of the lower end of the antenna cover 10 engages with the engaging portion formed on the base metal fitting 7 to be fitted.
Four mounting bolts 4 are erected on the base metal fitting 7 so that, for example, four mounting bolts 4 extend from the lower surface of the base metal fitting 7. Further, a cable insertion ring 21 for leading out the coaxial cable 5 and the vinyl coated wire 6 is fixed to the base metal fitting 7.

Next, FIG. 5 shows the structure of the antenna cover 10, and FIG. 6 shows a cross-sectional view of the antenna cover 10 taken along the center. However, FIG. 5A is a top view of the antenna cover 10, FIG. 5B is a side view thereof, and FIG. 5C is a rear view thereof. Also, FIG. 6 (b)
FIG. 7 is an enlarged view of part A of the sectional view shown in FIG. As shown in these figures, the antenna cover 10 is formed such that the front part has a gentle slope and the rear part has a steep slope, and an insert fitting 11 is formed on the top part thereof.
The insert metal fitting 11 is insert-molded so that its axis is tilted rearward, and the antenna part 1 attached to the insert metal fitting 11 is tilted rearward as shown in FIG. As a result, when the in-vehicle antenna 100 of the present invention is attached to the roof of the vehicle body or the like, it is less affected by the wind pressure during traveling, and
It can be excellent in design.

Further, as shown in FIG. 6, a ring-shaped O is provided inside the antenna cover 10 at the boundary between the insert-molded insert metal fitting 11 and the antenna cover 10.
A ring mounting groove 23 is formed. Since the O-ring mounting groove 23 is formed by the insert fitting 11 and the antenna cover 10, the O-ring mounting groove 23 has an O-ring mounting groove 23.
When the ring 12 is housed so as to be pressed, rainwater and the like that have infiltrated can be reliably waterproofed. Furthermore, from the head of the insert fitting 11 to the middle thereof, the antenna unit 1
Antenna mounting screw part 11a for detachably attaching the antenna
Is formed, the diameter of the lower part of the insert fitting 11 is reduced, and the mounting nut 13 is screwed onto the connecting screw portion 1.
1b is formed.

FIG. 7 shows the detailed structure of such an insert fitting 11. As shown in FIG. 7, the insert fitting 11 has a tapered portion on the side of the upper end and a knurled portion 11c formed by knurling below the tapered portion.
When the knurled portion 11c is insert-molded on the antenna cover 10, the knurled portion 11c is filled with the resin material forming the antenna cover 10 and serves as a stopper for the insert fitting 11. Insert metal fitting 1
The lower part of 1 has a small diameter and is formed with a connecting screw part 11b to which the mounting nut 13 is screwed. A first step portion 11d and a second step portion 11e are formed between the knurled portion 11c and the connecting screw portion 11b. This first
The insert 11 is prevented from coming out of the antenna cover 10 by the step portion 11d and the taper portion, and the O-ring mounting groove 23 is formed by the second step portion 11e. Since the insert fitting 11 is exposed to the atmosphere, it is preferably made of rustproof metal.

[0021]

As described above, according to the present invention, in the insert metal fitting formed so as to penetrate the antenna cover, the O-ring is inserted into the insert metal fitting protruding into the antenna cover and the O-ring is inserted into the antenna cover. Since it is watertightly stored in the mounting groove formed by the insert metal fittings, even if there is a gap at the boundary between the insert metal fitting and the antenna cover, rainwater, etc. that tries to enter through the gap will not The O-ring prevents further penetration at the. This can prevent rainwater or the like from entering the antenna cover. Further, since no adhesive or the like is used and the O-ring has a structure in which it is not molded, it is possible to easily realize a waterproof structure.

Further, in a plurality of cables led out from the circuit board housed in the antenna cover, the earth portion of the cable is fixed to the earth connecting metal fitting, and the folded portion is formed on the core wire to allow a sufficient length. Since the cable is provided, it is possible to prevent disconnection of the cable when tension is applied to the cable. Further, by inserting the cable into the bent guide portion, it is possible to prevent the cable from breaking when tension is applied to the cable.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a vehicle-mounted antenna according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a detailed configuration of an antenna base in the vehicle-mounted antenna according to the present invention.

FIG. 3 is an enlarged view showing a part of an antenna cover of the vehicle-mounted antenna according to the present invention.

FIG. 4 is an enlarged view showing the relationship between the circuit board, the coaxial cable, and the vinyl-coated wire in the vehicle-mounted antenna of the present invention.

FIG. 5 is a diagram showing a configuration of an antenna cover of the vehicle-mounted antenna according to the exemplary embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of an antenna cover of an in-vehicle antenna according to an embodiment of the present invention in a sectional view and a partially enlarged view.

FIG. 7 is a diagram showing a configuration of an insert fitting of the vehicle-mounted antenna according to the embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of an antenna cover in a conventional vehicle-mounted antenna.

[Explanation of symbols]

1 antenna part 2 antenna base 3 rubber pads 4 mounting bolts 5 coaxial cable 5a core wire 6 vinyl coated wire 7 Base bracket 10,110 Antenna cover 11,111 Insert metal fittings 11a Antenna mounting screw 11b Connection screw part 11c knurled part 11d 1st step 11e Second step 12,112 O-ring 13 Mounting nut 14 Connection fitting 15 circuit board 16 Soldering part 17 Guide 18 Projection 19 Folding part 20 ground metal fittings 20a Caulking part 20b collar part 20c punch part 20b soldering part 21 Cable insertion ring 22 Earth connection bracket 22a Bent section 22 Earth connection bracket 23 Ring mounting groove 100 car antenna

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01Q 1/32 H01Q 1/02 H01Q 1/12 H01Q 1/22

Claims (3)

(57) [Claims] 1. An on-vehicle antenna comprising an antenna section and an antenna base to which the antenna section is detachably attached, wherein the antenna base has an antenna cover whose inside is a storage space, and an antenna cover of the antenna cover. To close the bottom surface
Comprising at least a base metal fitting to be fitted, to the antenna cover, the antenna portion is insert fittings shaped to penetrate the antenna cover to be attached detachably, projecting into the interior of the antenna cover The antenna is fitted and inserted into the inserted metal fitting, and the antenna is provided at a portion inside the antenna cover , which is in contact with a step formed in the metal fitting.
An in-vehicle antenna, wherein an O-ring is housed in a watertight manner in a mounting groove formed so as to straddle the cover and the step . 2. A circuit board is housed in the antenna cover, and a connection fitting attached to the insert fitting protruding into the antenna cover so as to press the O-ring into the mounting groove, The vehicle-mounted antenna according to claim 1, wherein the antenna unit and the circuit board are connected to each other. 3. An in-vehicle antenna comprising an antenna part and an antenna base to which the antenna part is detachably attached, wherein the antenna base has an antenna cover having a storage space inside, and the inside of the antenna cover. A circuit board housed in and supplied with a signal from the antenna section, and a connection fitting attached to the insert fitting protruding into the antenna cover so as to connect the antenna section and the circuit board, The antenna cover is fitted so as to close the lower surface of the antenna cover, and a base metal fitting into which a plurality of cables can be introduced is provided, and the antenna portion is detachably attached to the antenna cover.
To penetrate the antenna cover so that it can be attached
Insert metal fittings are molded on the antenna cover.
When it is inserted into the insert fitting protruding into the inside of the
Both, the insert metal on the inner side of the antenna cover
The antenna is attached to the step portion formed on the tool.
Inside the mounting groove formed to cover the cover and the step
A watertight O-ring is housed in the terminal, and the ground portion of the first cable introduced into the antenna cover via the base metal fitting is fixed to the ground connecting metal fitting fixed to the circuit board, and folded back. The core wire formed with the part is connected to the circuit board so as to guide the signal supplied to the circuit board, and the second cable introduced into the antenna cover through the base metal fitting is folded into an S shape. An in-vehicle antenna, which is inserted into a bent guide portion and whose core wire is connected to the circuit board.