JP3411464B2 - Motor driven antenna device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive antenna device which is electrically connected to a power supply fitting by using a member for connecting a base end of an antenna element to a tip of a rack cord.

[0002]

2. Description of the Related Art In a conventional vehicle-mounted motor drive antenna device, a telescope-like multistage antenna element having a projected state of about 1 m is used. However, since this multi-stage antenna element has a long projecting length, it may be damaged due to an unexpectedly large force applied thereto, and other articles and the like are easily damaged. Further, it is not desirable in terms of design that a rod-shaped body having a length of about 1 m projects from the vehicle body.

From this point of view, the applicant of the patent has previously proposed that the projection length is about 15 cm according to Japanese Patent Application No. 8-114296.
And an extremely short motor drive antenna device is proposed.
In this technique, a helical coil is used as an antenna element and the physical length is short in the protruding state, but the antenna effective length is about 1 m. AM band signal and F
As an antenna for receiving an M band signal, antenna characteristics similar to those of the conventional antenna have been obtained.

The main part of the technique will be briefly described with reference to FIG. FIG. 7 is a vertical cross-sectional view of a main part of the previously proposed motor drive antenna device. In FIG. 7, an antenna cover 12 made of insulating resin is covered on an antenna element 10 made of a helical coil. This antenna cover 12
A connecting member 16 to which the tip of the rack cord 14 is connected is in contact with the lower end of the. Then, the joint pipe 18 straddles the lower end of the antenna cover 12 and the connecting member 16.
Are fitted and caulked, and the connecting member 16 is integrally connected and fixed to the antenna cover 12. Further, a linear conductive wire 10 a extends from the base end of the antenna element 10 and is provided along the rack cord 14. Then, the antenna element 10 covered with the integrated antenna cover 12 and the rack cord 14 are inserted into the cylindrical base 20 so as to be movable in the axial direction. Tubular base 2
The top nut 22 or the like provided at the front end portion of No. 0 regulates the movement in the pull-out direction with an appropriate protruding length. Further, in this projecting state, the power supply fitting 24 is arranged so as to project into the cylindrical base 20 so as to make elastic contact with the linear conductive wire 10a.

[0005]

In the technique shown in FIG. 7, the linear conductive wire 10a is led out and the power supply fitting 24 is attached to this.
By elastically contacting, the base end of the antenna element 10 is electrically connected to the power supply fitting 24 with a simple configuration. However, in such a structure, the number or area of contacts at which the power supply metal fitting 24 makes elastic contact with the linear conductive wire 10a is small, so that electrical connection may not be reliable and the antenna signal may not be stably output.

Therefore, as a technique for ensuring a reliable electrical connection, a lantern-shaped spring member made of a conductive material is provided so as to be electrically connected to the linear conductive wire 10a, and a pipe-shaped power supply corresponding to this spring member is provided. The metal fitting may be provided on the inner peripheral surface of the tubular base 20. However, the linear conductive wire 10a
Has been extended to the position where the rack of the rack cord 14 is engraved, and it is not possible to actually provide a lantern type spring member. Therefore, it is not necessary to provide a rack at the position where the linear conductive wire 10a is additionally provided, but this makes the rack cord 14 longer by that amount.

The present invention has been made to solve the above-mentioned problems of the prior art, and is a member for connecting the base end of the antenna element to the tip of the rack cord, which is electrically connected to the power supply fitting. An object is to provide a driving antenna device.

[0008]

In order to achieve the above object, the motor drive antenna apparatus of the present invention electrically connects a connection base made of a conductive material to the base end of the antenna element, and the connection base of the connection base is connected. A bottomed hole is formed in the lower end surface, an insulating resin coating member is provided so as to surround the outer circumference of the antenna element, and a pair of holder members that hold the tip of the rack cord and mesh with the rack are inserted into the bottomed hole. , A nut member made of a conductive material is screwed into the connection base so as to prevent the pair of holder members inserted in the bottomed hole from coming off, and electrically connected, and the lower end portion of the insulating resin coating member and the A joint pipe made of a conductive material is fitted over the nut member and caulked, and the insulating resin coating member and the nut member are connected and fixed to each other to fix the insulating resin coating member and the wire. Connecting the cord and electrically connecting the joint pipe and the nut member, and inserting the connected insulating resin coating member and the rack cord into a cylindrical base so as to be movable in the axial direction, and the antenna from the cylindrical base. A power supply fitting made of a conductive material is disposed on the cylindrical base in correspondence with the joint pipe with the element protruding by a predetermined length, and the joint pipe and the power supply fitting are electrically connected by a conductive elastic tongue. Is configured.

A plate member having a plurality of conductive elastic tongue pieces may be wound around the outer periphery of the joint pipe and fixed by welding.

Further, a linear conductive wire is extended from the base end of the antenna element, the linear conductive wire is electrically connected to the connection base, and the antenna element and the connection base are formed by insert molding. It is also possible to embed it in the insulating resin coating member and integrally mold it.

Further, the pair of holder members can be configured to be rotatable around an axis in the bottomed hole of the connection base.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will now be described with reference to FIG.
It will be described with reference to FIGS. FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of a motor drive antenna device of the present invention. 2A and 2B show a joint pipe provided with conductive elastic tongue pieces, FIG. 2A is a front view, and FIG. 2B is a view on arrow A of FIG. 3A and 3B show one holder that holds and engages one end of the rack cord, FIG. 3A is a front view, and FIG. 3B is a sectional view taken along the line BB of FIG.
(C) is a C arrow view of (a). FIG. 4 shows the other holder that holds one end of the rack cord, (a) is a front view, (b) is a sectional view taken along the line D-D of (a), and (c) is (a). ) Is an E arrow view. FIG. 5 is a vertical sectional view of an insulating resin pipe in which the antenna element and the connection base are integrated by insert molding. FIG. 6 is a vertical cross-sectional view illustrating that the base end of the antenna element is electrically connected to the power supply fitting in the protruding state.

1 to 6, a linear conductive wire 32 is extended from the base end of an antenna element 30 made of a helical coil, and the tip of the straight conductive wire 32 is soldered to a connection base 34 made of a conductive material for electrical connection. To be done. Then, the antenna element 30 and the connection base 34 are embedded in the insulating resin pipe 36 by insert molding to be integrally molded. Further, the insulating resin pipe 36 is covered with an antenna cover 38 made of an insulating resin. A bottomed hole 34a is formed in the connection base 34 from the lower end surface. The tip of the rack cord 40 has the first and second holders 42, 4
It is held by 4 and inserted into the bottomed hole 34a. The inner peripheral wall of the first holder 42 is provided with an uneven portion 42 a that meshes with the rack of the rack cord 40. Further, projections 42b, 42b ... And engagement holes 44b, 44b ... Are provided facing each other on the contact surfaces of the first and second holders. further,
Large diameter portions 42c and 44c are formed on the first and second holders 42 and 44 so as to be continuous around the axis. The first and second holders 42 and 44, which are combined by sandwiching the front end of the rack cord 40, are inserted into the bottomed hole 34a and are rotatable around the axis. Further, a nut member 46 made of a conductive material is screwed onto the connection base 34. The nut member 46 is provided with a hole having a diameter that prevents the large diameter portions 42c and 44c of the first and second holders 42 and 44 from coming out, and the rack cord 40 rotates about the axis with respect to the connection base 34. It is free and is prevented from coming off and is connected. The outer diameter of the nut member 46 is almost the same as the lower end portion of the antenna cover 38. Moreover, grooves around the shaft are appropriately formed in the lower ends of the nut member 46 and the antenna cover 38.

The antenna cover 3 is made of a conductive material.
On the outer periphery of the joint pipe 48 fitted to the lower end portion of 8 and the nut member 46, there is provided a plate material on which a plurality of conductive elastic tongue pieces 50, 50 ... It is wound around an axis, fixed by spot welding, etc. and electrically connected. Then, the joint pipe 48 provided with the conductive elastic tongues 50, 50 ... Is fitted across the lower end portion of the antenna cover 38 and the nut member 46, and further, the antenna cover 38 and the nut member 46 are caulked. The joint pipe 48 and the nut member 46 are electrically connected together. The antenna element 30 and the rack cord 40 which are integrated and connected in this way are inserted into the cylindrical base 52 so as to be movable in the axial direction. Moreover, in a state where the antenna element 30 is projected from the cylindrical base 52 by a predetermined length, a position corresponding to the joint pipe 48,
That is, on the inner peripheral wall of the cylindrical base 52 at the position where the conductive elastic tongues 50, 50 ...
Is provided.

Although not shown in the drawings, a pinion gear connected to a motor is meshed with the rack of the rack cord, and the antenna element 30 is projected or stored by the forward rotation and the reverse rotation of the motor. This is the same as the motor drive antenna device.

In such a structure, with the antenna element 30 protruding from the cylindrical base 52 by a predetermined length, the base end of the antenna element 30 has a straight conductive wire 32, a connection base 34, a nut member 46, a joint pipe 48, and The power supply fitting 5 through the conductive elastic tongues 50, 50 ...
4 is electrically connected. Moreover, since the plurality of conductive elastic tongue pieces 50, 50 ... Make elastic contact with the power supply fitting 54, their electrical connection is surely made. Therefore, the antenna signal can be appropriately derived from the power supply fitting 54 and can be given to the amplifier circuit 56 and the like. The joint pipe 48 is a member for connecting and fixing the antenna cover and the nut member 46 to connect the rack cord 40, and a member for electrically connecting the base end of the antenna element 30 to the power supply fitting 54. It also serves as. Then, since the first and second holders 42 and 44 inserted into the bottomed hole 34a of the connection base 34 can rotate around the axis within the bottomed hole 34a, the antenna cover 38 is attached to the rack cord 40. Relative rotation is possible around the axis. Therefore, even if a force in the twisting direction acts on the antenna cover 38, the rack cord 40
There is no danger of being twisted.

In the above embodiment, the antenna cover 38 is put on the insulating resin pipe 36 which is insert-molded so as to embed the antenna element 30.
The insulating resin pipe 36 and the antenna cover 38 may be integrally molded. That is, if the antenna element 30 is embedded in the resin and at least the outer circumference thereof is not exposed, the insulating resin pipe 36 also functions as the antenna cover 38. Therefore, as in the above-described embodiment, the joint pipe 48 extends over the lower end portion of the antenna cover 38 as the insulating resin coating member and the nut member 46.
Alternatively, the lower end portion of the insulating resin pipe 36 as the insulating resin coating member and the nut member 46 may be connected and fixed by the joint pipe 48.

The conductive elastic tongues 50, 50 ... Are not limited to those provided on the joint pipe 48 by welding, but may be formed by cutting and raising the joint pipe 48. Further, a conductive elastic tongue may be provided on the side of the power supply fitting 54 so as to make elastic contact with the joint pipe 48 for electrical connection.

[0019]

As described above, since the motor drive antenna device of the present invention is constructed, the following special effects are obtained.

In the motor-driven antenna device according to the first aspect, the joint pipe feeds the member for connecting the rack cord to the lower end of the insulating resin coating member surrounding the antenna element and the base end of the antenna element. Since it also serves as a member for electrically connecting to the metal fitting, the number of parts is smaller than that of a structure in which a member for electrical connection is provided in addition to a member for connecting. Also, insert a pair of holders that hold the rack cord and mesh with the rack into the bottomed holes of the connection base, and screw a nut member into the connection base to remove the pair of holders from the bottomed holes. Since the nut member is fixed by the crimping of the joint pipe, the rack cord is reliably prevented from coming off.

In the motor drive antenna device according to the second aspect of the present invention, since the plate material having a plurality of conductive elastic tongues is wound around the joint pipe and welded, the joint pipe is cut and raised to cut the conductive elastic tongue. The strength of the joint pipe is greater than that of forming it. Here, since the joint pipe itself is fixed by caulking, a thick plate material or a material that is too rigid is inappropriate. Therefore, by winding and fixing the plate material on which the conductive elastic tongue is formed,
It is not unsuitable for caulking or the like, and can have a high strength. Furthermore, since the plurality of conductive elastic tongue pieces provided on the joint pipe elastically contact the power supply fitting, a reliable electrical connection can be obtained.

Further, in the motor drive antenna device according to the third aspect of the invention, since the antenna element and the connection base electrically connected to the antenna element are embedded in the insulating resin coating member by insert molding and integrally molded, the number of parts is reduced. Is less. Moreover, there is no variation in the dimension between the antenna element and the connection base, and constant antenna characteristics can be obtained.

Further, in the motor drive antenna device according to the fourth aspect, since the pair of holder members can freely rotate about the axis within the bottomed hole of the connection base, the antenna element and the rack cord can rotate about the axis. Relative rotation is possible. Therefore, even if a force in the twisting direction acts on the antenna element, the rack cord is not twisted.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part of an embodiment of a motor drive antenna device of the present invention.

2A and 2B show a joint pipe provided with conductive elastic tongues, FIG. 2A is a front view, and FIG. 2B is a view taken in the direction of arrow A in FIG.

FIG. 3 shows one holder that holds and meshes one end of a rack cord, and (a) is a front view,
(B) is a BB arrow sectional view of (a), (c) is a C arrow view of (a).

FIG. 4 shows the other holder that holds one end of the rack cord, (a) is a front view, and (b) is a D- of (a).
It is a sectional view taken along the arrow D, and (c) is a sectional view taken along the arrow E of (a).

FIG. 5 is a vertical cross-sectional view of an insulating resin pipe in which an antenna element and a connection base are integrated by insert molding.

FIG. 6 is a vertical cross-sectional view illustrating that the base end of the antenna element is electrically connected to the power supply fitting in the protruding state.

FIG. 7 is a vertical cross-sectional view of a main part of the previously proposed motor drive antenna device.

[Explanation of symbols]

30 antenna elements 32 straight conductive wire 34 Connection base 34a bottomed hole 36 Insulating resin pipe 38 antenna cover 40 rack code 42 first holder 44 Second holder 46 Nut member 48 joint pipe 50 conductive elastic tongue 52 Cylindrical base 54 Power supply fitting

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-7-240616 (JP, A) Actual development Sho 64-55713 (JP, U) Actual public Sho 58-27533 (JP, Y1) Actual public 5- 46330 (JP, Y2) Actual Kohei 3-729 (JP, Y2) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01Q 1/10 H01Q 1/32 H01Q 1/22 F16B ^7/ 00- 7/22

Claims (4)

(57) [Claims] 1. A connection base made of a conductive material is electrically connected to a base end of the antenna element, a bottomed hole is formed in a lower end surface of the connection base, and an outer periphery of the antenna element is surrounded by an insulating resin. A cover member is provided, and a pair of holder members for holding the tip of the rack cord and meshing with a rack are inserted into the bottomed hole, and the pair of holder members inserted into the bottomed hole are connected so as not to come out. A nut member made of a conductive material is screwed onto the base and electrically connected,
A joint pipe made of a conductive material is fitted over the lower end portion of the insulating resin coating member and the nut member and caulked to connect and fix the insulating resin coating member and the nut member to each other. And the rack cord are electrically connected to each other, the joint pipe and the nut member are electrically connected, and the connected insulating resin coating member and the rack cord are axially movably inserted into the tubular base, and the tubular base is connected. From the antenna element, a power supply fitting made of a conductive material is disposed on the tubular base in a state of protruding by a predetermined length, in correspondence with the joint pipe.
A motor drive antenna device, wherein the joint pipe and the power supply fitting are electrically connected by a conductive elastic tongue. 2. The motor drive antenna device according to claim 1, wherein a plate member having a plurality of conductive elastic tongues is formed,
A motor drive antenna device, wherein the motor drive antenna device is configured by being wound around the outer periphery of the joint pipe and being fixed by welding. 3. The motor drive antenna device according to claim 1, wherein a linear conductive wire is extended from a base end of the antenna element, and the linear conductive wire is electrically connected to the connection base, A motor drive antenna device, characterized in that the element and the connection base are embedded in the insulating resin coating member by insert molding and integrally molded. 4. The motor drive antenna device according to claim 1, wherein the pair of holder members are configured to be rotatable about an axis within the bottomed hole of the connection base. apparatus.