JPS597761Y2 - Vehicle antenna device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to antennas installed in automobiles and other vehicles, and more particularly to a vehicle antenna device in which a telescoping rod antenna element is telescopically driven by a drive wire.

In general, this type of antenna device has one end fixed to the drive end of the antenna element, and the other end of the resin drive wire is wound around and unwound around a rotating drum driven to rotate by a motor. It is used to drive the element to expand and contract.

In addition, instead of the above-mentioned rotating drum, a pulley, a roller, etc. that is rotationally driven by a motor is used, and these pulleys,
There is also a device in which the drive wire is sandwiched in the middle by a feed roller or the like to transfer the wire in the longitudinal direction.

In conventional antenna devices with the above structure, the drive wire is generally flexible, so there is considerable loss due to bending or meandering of the wire, or loss due to slipping between the outer peripheral surface of the wire and the drive source. However, there is a drawback that the driving force of the motor is not efficiently transmitted to the driving end of the antenna element.

The present invention was developed in consideration of these circumstances, and its purpose is not only to eliminate slippage between the wire and the drive source, but also to eliminate bending and bending of the wire even when a flexible drive wire is used. There is almost no loss due to meandering, the driving force of the motor can be efficiently transmitted to the driving end of the antenna element, the space occupied by the antenna device inside the vehicle body is small, and there is no risk of noise interference. An object of the present invention is to provide a vehicle antenna device.

Hereinafter, details of the present invention will be clarified by referring to embodiments shown in the drawings.

FIG. 1 is a side view showing the schematic structure of an embodiment of this invention.

In this FIG. 1, 1 is a plurality of pieces (three pieces in this example)
Rods la, lb consisting of conductive pipes with different diameters
, is a telescopic rod antenna element in which ICs are slidably connected to each other.

The antenna element 1 is inserted into and removed from the housing tube main body 2.

The storage cylinder main body 2 has its top portion fixed to a mounting hole 6 provided in a vehicle body wall 5 by an upper mounting element 3, a lower mounting element 4, and the like.

A power feeding section 8 for electrically connecting the antenna element 1 to the power feeding line 7 is provided near the top of the housing cylinder body 2.

Reference numeral 9 denotes an element storage part of the storage cylinder main body 2, and a drive mechanism 10 containing a DC motor and other components is installed at the base end of this element storage part 9.
is installed.

The drive mechanism 10 will be described later, but a flexible wire guide tube 11 made of plastic or the like is connected to the bottom of the drive mechanism 10, and a wire guiding tube 11 is connected to the bottom of the drive mechanism 10. The wire 12 is slidable.

FIG. 2 is a sectional view showing the structure near the top of the storage cylinder main body 2 shown in FIG. 1.

In FIG. 2, 13 is a first grounding conduit made of metal such as aluminum, and 14 is made of metal such as brass and coaxially disposed within the first grounding conduit 13. This is the second grounding conduit.

The first and second grounding conduits 13. Although the structure of the proximal end side of 14 will be described later, at least both conduits 13 and 14
is electrically shorted.

The first and second grounding conduits 13. Near the top of 14, the above-mentioned power feeding section 8 is provided.

The power supply unit 8 is constructed by inserting a part of a power supply conductive pipe 15 made of brass, for example, inward from the open end of the top of the first ground conduit 13 , and inserting the first ground conduit 13 into the part of the conductive pipe 15 . The core wire 7a of the feeder line 7 introduced through the hole made in the peripheral wall of the feeder line 7 is electrically connected to the shielding braided wire 7b of the feeder line 7.
is electrically connected to the first grounding conduit 13.

A conductive contact piece 16 is provided on the inner peripheral surface of the conductive tube 15 to establish electrical continuity with the outer peripheral surface of the maximum diameter rod 1C of the antenna element 1 inserted into the conductive tube 15. .

The conductive tube 15, the core wire 7a of the power supply line 7, the shielding braided wire 7b, etc. are fixed in position by an insulator 17 such as a synthetic resin cast in this portion.

Note that the insulator 17 is oval-shaped so that it does not exist inside the conductive tube 15 and in the cylindrical region below the conductive tube 15 in the figure.

Therefore, the maximum diameter rod 1C of the antenna element 1 can enter the inside of the first grounding conduit 13 through the inside of the conductive tube 15 and the cylindrical hollow part 17a of the insulator 17.

A portion of the insulator 17 protrudes outward from the top open end of the first grounding conduit 13 so as to cover the outer periphery of the conductive tube 15 .

A conductive tab 18 is fitted into the outer periphery of this protrusion 17b.

This conductive collar 18 connects the lower mount 4 formed of a conductive member such as an aluminum alloy to the first ground conduit 13.
This is to stably hold it at the top of the ground conduit 13 and to ensure electrical continuity between the first grounding conduit 13 and the lower mount 4.

The lower mount 4 is stably held at a predetermined angle with respect to the axis of the storage cylinder main body 2 by the conductive collar 18, and the lower end edge in the figure is shaped into a semicircular arc, and the lower edge is shaped along the arc surface. A plurality of serrated protrusions 4a are provided.

Further, a sharp protrusion 4b is provided on the upper edge of the lower mount 4 in the figure so that it can easily bite into the back surface of the vehicle body wall 5.

The top open end of the second ground conduit 14 is joined to the bottom open end of the cylindrical hollow portion 17 a of the insulator 17 .

The inner circumferential surface of the second ground conduit 14 and the inner circumferential surface of the hollow portion 17a of the insulator 17 are flush with each other, forming a single hollow cylindrical portion 19.

Thus, the conductive slider 20 attached to the lower end of the maximum diameter rod 1C of the antenna element 1 can slide along the inner peripheral surface of the hollow cylindrical portion 19.

The extended portion of the drive wire 12 led out from the lower end of the maximum diameter rod 1C is guided by a wire drive element to be described later and driven in the longitudinal direction.

In this way, when the maximum diameter rod 1C is pushed upward in the figure to the upper limit position by the drive wire 12, the slider 20 comes into contact with the inner peripheral surface of the hollow part 17H of the insulator 17, and the maximum diameter When the rod 1C is slightly retracted downward in the figure, it comes into contact with the inner circumferential surface of the second grounding conduit 14.

FIG. 3 is a diagram showing the structure of the drive mechanism 10 shown in FIG. 1, with the left half cut away.

As is clear from FIG. 3, the second grounding conduit 14
The tail end of the first grounding conduit 13 projects significantly downward in the figure from the tail end opening of the first grounding conduit 13, and is fitted to a position beyond the center of the drive mechanism 10.

The drive mechanism 10 includes a rotor mechanism portion A of a motor that rotates about the second ground conduit 14, first and second ground conduit 13. 14 and includes a motor brush, a permanent magnet on the stator side, etc.
and a wire driving element which is integrally connected to this upper mechanism part B and is connected to the rotor mechanism part A via a clutch and which drives a wire for driving the antenna element, and a wire which holds the wire in a non-rotating state. It is roughly divided into a lower mechanism C equipped with a guide and the like.

The rotor mechanism portion A is mainly composed of a motor rotor 21 having the second ground conduit 14 as its axis.

That is, the rotor 21 has a hollow rotating shaft 22 rotatably fitted around the outer periphery of the ground conduit 14, a rotor-side iron core 23 fixed to this rotating shaft 22, and a winding 24 wound around this iron core 23. It is something.

The terminal of the winding 24 is connected to a commutator 25 fixed to the rotating shaft 22.

Further, a metal 26 and a joint metal 27 are fixed to both ends of the rotating shaft 22.

The upper mechanism portion B is constructed using an upper case 31 as a component storage body.

The case 31 is formed into a gourd shape with the diameters varying stepwise by insulating parts such as hard plastic or resin, and the small diameter part 31a is connected to the first grounding conduit 13.
It is fitted onto the outer circumference of the tail end.

A substantially cylindrical fixing element 3 is provided at the tail end opening of the first ground conduit 13 into which the small diameter portion 31a of the case 31 is fitted.
2 is fitted.

A flange 32a is provided at the base end of this fixing element 32.

Therefore, in a state where the hollow part of the fixing element 32 is fitted to the outer circumference of the second ground conduit 14, the tip is connected to the inner circumferential surface of the tail end of the first ground conduit 13 and the outer circumferential surface of the second ground conduit 14. When the flange 32a is inserted into the portion facing the case 31 and the first and second ground conduits 13. The relative positional relationship of 14 will be fixed.

The fixing element 32 is made of a metal material such as aluminum or brass, or a conductive member having a metal coating on the surface of a composite or resin base.

For this reason, the first and second grounding conduits 13. 14 will be electrically short-circuited by the fixing element 32.

Note that in the fixing element 32, a portion 32b of the cylindrical portion engages with a portion of the ground conduit 13 by caulking the first ground conduit 13.

Therefore, axial movement is prevented and separation from the first ground conduit opening is prevented.

Further, the proximal end surface of the fixing element 32 is liquid-tightly closed by a closing plate 33.

A brush holder 3 is located inside the large diameter portion 3lb of the upper case 31.
4 is installed.

This brush holder 34 is made of synthetic resin and stably holds the carbon brush 35 in the brush holding groove.

Note that 36 is a coil spring that always applies a predetermined pressure to the brush 35 so that the tip of the brush 35 contacts the surface of the commutator 250 with the required pressure, and 37 is a coil spring for adjusting the pressing force of the spring 36 as appropriate. There is no adjustment.

A portion 34a of the brush holder 34 extends into the midsection 31C of the case 31, and serves as a metal holder that rotatably holds the metal 26.

The other part 34b of the brush holder 34 is the case 31.
It extends along the inner circumferential surface of the large diameter portion to the open end of the large diameter portion 31b, and is in contact with one end surface of a stator side iron core (=permanent magnet) 38 made of a ferrite core.

This magnet 38 has an annular shape, and its outer peripheral surface is supported by a core case 39 so as to surround the iron core 23 of the rotor 21 with a predetermined gap.

The core case 39 is made of a soft magnetic material and has a cylindrical shape, and one end of the core case 39 is inserted into an insertion groove provided at the open end of the large diameter portion 31 b of the upper case 31 .

The lower mechanism portion C is constructed using a lower case 41 as a component storage body.

Like the upper case 31, the lower case 41 is formed of an insulating material such as plastic or resin, and has a cylindrical shape with a hemispherical bottom wall.

At the center of the bottom wall of this case 41 is a wire lead-out port 41.
a is provided, and this wire guide tube 41 is provided with a wire guide tube 1 made of flexible resin such as the above-mentioned material.
1 is connected.

Further, on the end face of the upper end opening of the lower case 41, there is a retaining part 41b that engages with the end face of the lower end opening of the upper case 31.
is provided.

Therefore, when the cylindrical portion 41C of the lower case 41 is fitted to the outer periphery of the core case 39 attached to the upper case 31, the engaging portion 4lb engages with the end surface of the upper case 31.

The upper case 31 and the lower case 41 are integrally connected by fitting the locking ring 43 to the engagement portion and caulking the engagement portion.

Incidentally, a metal holder 44 is mounted inside the lower case 41 and supported by a step formed on the inner peripheral surface of the case.

The holder 44 is made of, for example, hard plastic or resin, and rotatably holds the outer circumferential surface of the joint metal 27 on the inner circumferential surface of a cylindrical portion 44a provided at the center.

Also, a cylindrical portion 44 provided around the holder 44
The upper end surface b can support the lower end surface of the magnet 38.

At the bottom of the above metal holder diagram is a wire drive element 45.
is provided.

This wire drive element 45 is formed of, for example, a composite or resin, and is rotatably coupled to the joint metal 27 via a clutch mechanism 46.

The clutch mechanism 46 includes a clutch plate 46a whose cylindrical portion is non-rotatably engaged with a joint metal 27, and a clutch plate 46a that is constantly pressed against the inner surface of the upper wall 45a of the wire drive element 45 with a predetermined pressure. It is composed of a coil spring 46b that forces the

Note that a pressing plate 46C is interposed between the spring 46b and the clutch plate 46a to stabilize the pressing force.

A wire drive hole 45b having a female thread is provided along the inner circumferential surface of the wire drive element 45 at the center of the bottom wall thereof, that is, at the axial center facing the tail end opening of the second ground conduit 14. ing.

A wire guide 48 is provided below the wire drive element 45 in the figure so as to support the wire drive element 45 via a sliding plate 47.

This wire guide 48 has a funnel shape as a whole, and its stem is connected to the wire lead-out port 41a of the lower case 41.
The wire driving element 45 is fitted into the bottom of the case 41 in a non-rotating state with the enlarged part positioned outside the wire driving hole 45b of the wire driving element 45.

The wire 12 is held in a non-rotating state around the axis on the inner surface of the stem portion of the wire guide 48, and the wire drive hole 45
A non-circular hole is provided for guiding the person to b.

FIG. 4 is a diagram showing the relationship between the wire 12, the wire drive element 45, and the wire guide 48.

5 is a perspective view showing the shape of the wire 12 with a part cut away, FIG. 6 is a cross-sectional view taken along the line D-D in FIG. 4, and FIG. 7 is a cross-sectional view taken along the line E-E in FIG. 8 is a sectional view taken along the line FF in FIG. 4.

As is clear from these FIGS. 4 to 8, the wire 1
2 has an oval cross-sectional shape including the threaded portion.

Therefore, the wire 12 passing through the wire guide 48 having a non-circular hole of the same shape is held in a non-rotating state around the axis.

On the other hand, the wire 12 has a threaded portion provided on its circumferential surface screwed into a female threaded portion of the wire drive hole 45 b of the wire drive element 45 .

Therefore, when the drive element 45 rotates, the wire 12
It will slide in the direction of arrow A in the figure or toward the mouth.

Next, the operation of the apparatus configured as described above will be explained.

First, the operation when extending the antenna element 1 housed in the housing cylinder will be explained.

When a DC power source is connected to the drive mechanism 10, the DC energy from the power source is supplied to the winding 24 of the rotor 21 via the brush 35 and commutator 25.

Now, assuming that the direct current from the DC power source has a polarity that causes the motor to rotate in the forward direction, the rotor 21 starts rotating in the forward direction.

As the rotor 21 rotates, the joint metal 27 fixed to the rotating shaft of the rotor 21 rotates, so the clutch plate 46a, which is non-rotatably coupled to the joint metal 27, rotates.

When the clutch plate 46 a rotates, this clutch plate 46
The wire drive element 45, in which the inner surface of the upper wall 45a is pressed against the upper wall 45a, rotates.

Then, the wire drive hole 45 of the wire drive element 45
The wire 12 screwed into b is driven upward in the figure.

When the wire 12 begins to move, the drive end (the tail end of the smallest diameter rod 1a) of the antenna element 1, which has been drawn into the deepest part of the second grounding conduit 14, is pushed upward in FIGS. 1 to 3. To go.

When the smallest diameter rod 1a is completely pushed out of the storage cylinder, the tail end of the smallest diameter rod 1a and the tip of the next stage rod 1b are connected to the power bow 1, and the next stage rod 1b is pulled out.

In this way, the rods with larger diameters are successively pulled out of the storage cylinder, and finally the largest diameter rod 1C is pulled out of the storage cylinder.

When the maximum diameter rod 1C is pulled out near the upper limit position, the conductive slider 20 attached to the tail end of the maximum diameter rod 1C
separates outward from the top open end of the second ground conduit 14;
It enters the hollow part of the insulator 17.

Therefore, at this point, the antenna element 1 is released from the grounded state and becomes ready for transmission and reception.

When the maximum diameter rod 1C is pulled out to the upper limit position, that is, the position where the slider 20 comes into contact with the lower edge of the power feeding conductive tube 15 provided at the top of the housing cylinder body 2, the antenna element 1
The extension operation of stops.

Therefore, the movement of the wire 12 is also stopped.

In this case, the wire drive element 45 becomes unable to rotate.

Therefore, the clutch plate 46 a is connected to the wire drive element 45
It slips while in contact with the upper wall 45a and spins idly.

Immediately after this, a known limit switch or the like is activated and the DC power supply to the drive mechanism 10 is cut off.

Therefore, the rotor 21 of the motor stops rotating.

Next, the operation when pulling the antenna element 1 in the extended state into the storage cylinder will be explained.

When a DC power source is connected to the drive mechanism 10 with the polarity reversed from that in the above case, the rotor 21 starts rotating in the reverse direction.

As the rotor 21 rotates, the wire drive element 45 rotates via the clutch mechanism 46.

Therefore, the wire 12 is driven downward in FIGS. 1-3.

When the wire 12 starts moving, it first moves to the smallest diameter rod 1a.
begins to descend.

When the smallest diameter rod 1a is completely retracted into the next stage rod 1b, the next stage rod 1b then starts to descend.

In this way, the largest diameter rod 1C finally begins to descend.

When the maximum diameter rod 1C has descended slightly from the upper limit position, the slider 2 attached to the tail end of the maximum diameter rod 1C
0 enters the second ground conduit 14.

Therefore, at this point, the antenna element 1 is grounded and becomes incapable of transmitting and receiving.

The maximum diameter rod 1C is the lower limit position, that is, the maximum diameter rod 1C
When the tail end of the antenna element 1 comes into contact with the top surface of the bottom wall of the wire driving element 45, the retracting operation of the antenna element 1 is completed.

Therefore, the movement of the wire 12 is also stopped.

As a result, the wire drive element 45 becomes unable to rotate, and the clutch plate 46a rotates idly.

In the above-described operation, the wire 12 led out from the wire lead-out port 41a of the lower case 41 slides inside the tube 11 and is led to an arbitrary space within the vehicle body.

In this manner, in this device, the wire 12 for driving the antenna element to expand and contract is directly driven by the threaded portion of the wire drive element 45, so there is no slippage between the drive source and the wire 12.

Moreover, since the wire drive hole 45 b of the wire drive element 45 is provided close to the tail end opening of the second grounding conduit 14 that guides the drive end of the antenna element 1 in the stored state to the deepest part, Even at the start of antenna element extension, when the load is at its maximum, there is almost no bending or meandering of the wire.

Therefore, the driving force of the motor is transmitted to the antenna element 1 extremely efficiently.

In addition, in this device, the tail end of the second ground conduit 14 into which the antenna element 1 is inserted when stored is connected to the motor rotor 2.
The shaft 22 of the drive mechanism 10 is inserted into the vicinity of the bottom of the drive mechanism 10 through the shaft 22 of the drive mechanism 10.
The dimension to the bottom of the 0 (so-called under-neck dimension) can be quite short.

Therefore, there is an advantage that the antenna device occupies only a small space within the vehicle body.

Furthermore, in this device, when the antenna element 1 is driven to extend or contract, the antenna element 1 is connected to the second ground except for a period from immediately before the completion of the extension operation to the completion of the extension operation and a short period from the start of the reduction operation to immediately after that. It slides through the conduit 14.

Therefore, the noise generated during the rotation operation of the motor does not interfere with the antenna element 1, and even if the receiver etc. is operated during the expansion and contraction operation of the antenna element 1, there will be no noise.
There is no risk of such unpleasant noises occurring.

The drive mechanism 10 of this device does not require any fixing elements such as screws or bolts during assembly, and can be assembled entirely by fitting means and caulking, so the assembly work is simple and can be assembled reliably. can.

Note that the present invention is not limited to the embodiments described above.

For example, in the above embodiment, three conductive pipes with different diameters are connected as a telescopic antenna element, but the number of conductive pipes may be any number, and in extreme cases, a single conductive pipe or a rod may be used. It may be shaped so that it can be freely inserted into and removed from the storage cylinder.

Further, in the embodiment, the first ground conduit 13 is used as the ground conduit.
Although a coaxial combination of the ground conduit and the second grounding conduit 14 is shown, the second grounding conduit 14 may be used alone as long as a means for grounding the vehicle body is ensured.

Further, in the embodiment described above, a part (upper side wall) of the wire drive element 45 was used also as one of the clutch plates, but it is also possible to fix a separately shaped clutch plate to a part of the wire drive element 45. You may also do so.

Further, in the above embodiment, the wire 12 has an oval cross-sectional shape, but it may have any non-circular cross-sectional shape.

Furthermore, the materials for each part may be arbitrarily selected within a range that does not cause any functional problems.

As explained above, according to the present invention, the wire for driving the expansion and contraction of the antenna element, which has a threaded portion on the circumferential surface, is directly driven by the threaded portion of the wire driving element, so that the wire between the wire and the drive source is directly driven by the threaded portion of the wire driving element. The screw part of the wire drive element is provided close to the proximal opening of the grounding conduit that leads the drive end of the antenna element to the deepest part, so it is possible to use a flexible wire. Even when used, there is almost no bending or meandering of the wire, and the driving force of the motor can be efficiently transmitted to the driving end of the antenna element.

In addition, according to the present invention, the tail end of the grounding conduit into which the antenna element is inserted when stored passes through the motor rotating shaft and is introduced near the bottom of the drive mechanism, so that the length of the antenna device inside the vehicle body wall is The length (dimension from the lower side of the car body wall to the bottom of the drive mechanism) is reduced by the length of the grounding conduit introduced into the drive mechanism, and in the end, the antenna device occupies only a small space inside the car body. It has the advantage of

Furthermore, since the antenna element inserted into the drive mechanism is surrounded by a grounding conduit and grounded, there is no risk of noise from motor rotation interfering with the receiving system during expansion and contraction of the antenna element.

As described above, according to the present invention, an antenna device having various special advantages can be provided.

[Brief explanation of drawings]

FIG. 1 is a side view showing the schematic structure of an embodiment of the present invention;
Fig. 2 is a sectional view showing the structure near the top of the storage cylinder main body in the same embodiment, Fig. 3 is a left half cutaway view showing the structure of the drive mechanism in the same embodiment, and Fig. 4 is the same embodiment. Fig. 5 is a perspective view showing the shape of the wire in the same embodiment;
6 to 8 are a sectional view taken along the line D-D, a sectional view taken along the line E-E, and a sectional view taken along the line F-F in FIG. 4, respectively. DESCRIPTION OF SYMBOLS 1... Telescopic rod antenna element, 2... Storage tube main body, 10... Wire drive mechanism, 12... Wire, 1
3... first grounding conduit, 14... second grounding conduit,
21... Motor rotor, 22... Hollow rotating shaft,
45... Wire drive element, 46... Clutch mechanism,
48...Wire guide.

Claims (1)

[Scope of utility model registration request] A storage tube body provided with a telescoping rod antenna element, a power feeding portion for electrically connecting at least the antenna element to a power feed line, the housing tube body being provided so that the antenna element can be inserted into and removed from the inside of the vehicle body, and the storage tube A hollow grounding conduit, which is provided so that the antenna element is fitted into the element storage part of the main body, is insulated from the element when the antenna element is extended, and is electrically connected to the element when the antenna element is stored; a motor having a hollow rotary shaft rotatably fitted on its outer periphery; and a shaft center rotatably coupled to the rotary shaft of the motor via a clutch mechanism and facing close to the proximal opening of the ground conduit. a wire drive element having a wire drive hole with a threaded part formed along the inner circumferential surface of the wire drive element; a long drive wire guided into the ground conduit through the drive hole and fixed to the drive end of the antenna element; A vehicle antenna device comprising a wire guide that guides a wire to a drive hole.