JPH0335601A - Electric antenna device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric antenna device mounted on a vehicle and used for receiving and transmitting high frequency signals such as a car phone.

[Prior Art] As shown in Japanese Unexamined Patent Publication No. 62-206902e, a conventional antenna device includes a casing, a pinion gear supported in the casing, a drive section for driving the pinion gear, and an antenna element at the tip. There is known a cable having an antenna guide that is extendably erected on the casing, and a cable that is driven by a pinion gear and has a rack part that extends and contracts the antenna guide.

[Problems to be Solved by the Invention] However, since the cable with the above-mentioned rack part is easily bent, even if the cable and the pinion gear are reliably engaged and fed out and wound up, the antenna element and the pinion gear may not be connected to each other. There was a drawback that the antenna guide could not be accurately expanded or contracted due to the bending occurring between the antenna guides.

The present invention was devised in view of the above-mentioned drawbacks, and an object of the present invention is to provide an electric antenna device capable of accurately extending and contracting an antenna guide by driving a cable using a pinion gear.

[Means for Solving the Problems] The electric antenna device of the present invention includes a casing, a pinion gear supported in the casing, a drive section for driving the pinion gear, and an antenna element at the tip, which is extendable and retractable to the casing. It has an antenna guide erected, and a cable having a rack part that is driven by the pinion gear to expand and contract the antenna guide, and the cable has an antenna wire attached to the antenna element at one end and an axis centered around the antenna wire. and a resin wire having a rack portion on the outer peripheral surface that is driven by the pinion gear.

[Operation] With the above configuration, the pinion gear is driven by the drive unit to rotate forward and backward. At this time, the rack portion of the resin wire meshes with the pinion gear, and the cable consisting of the antenna wire and the resin wire is fed out and wound up. This movement of the cable causes the antenna element at one end of the antenna to move up and down, causing the antenna guide to expand and contract. Here, the antenna wire is held at the core of the highly rigid resin wire and moves together with the resin wire, so the amount of bending is extremely small, and even when bent during winding, the resin wire and antenna wire Since the centers of the bent portions coincide, there is no difference in length between the two, so the antenna guide can be expanded and contracted accurately.

[Example 1] The electric antenna device of this example has the following features as shown in FIG.
A casing 1, a pinion gear 2 supported in the casing 1, a drive unit 3 that drives the pinion gear 2, an antenna guide 4 that has an antenna element 41 at its tip and is extendably erected on the casing 1, and the pinion gear 2. It consists of a double 5 having a rack part 521 that is driven to extend and contract the antenna guide 4.

A motor 31 constituting a part of the drive section 3 is fixed to the upper part of the box-shaped casing 1, and an output shaft 311 of the motor 31 extends downward. A worm 32 is formed at the tip of this output shaft 311.

have. The worm 32 rotationally drives a worm gear 33 supported by the casing 1 . The shaft supporting the worm 32 also has a spur gear (not shown), and this spur gear rotationally drives a spur gear 34 supported on the casing 1. On the other hand, a pinion gear 2 is rotatably supported in the casing 1, and is driven by the spur gear 34 described above to rotate forward and backward.

The antenna guide 4 is a known type consisting of an outer cylinder and two inner cylinders, and has an antenna element 41 at its axis.
It expands and contracts according to relative movement with respect to the outer cylinder of No. 1.

The cable 5 consists of a coaxial line 51, which is an antenna line, and a resin wire 52 that holds the coaxial line 51 at its axis.

As shown in FIG. 6, the coaxial 1!51 is composed of a center conductor 511, an insulator 512 surrounding it, an outer conductor 513 surrounding the insulator 512, and a protective coating 514 covering the outer conductor 513, with one end attached to the antenna. It is attached to the lower end of the element 41. As shown in FIGS. 3 to 5, the resin wire 52 has a cutout portion 522 that has a U-shaped cross section and extends in the axial direction.
By attaching the coaxial line 51 to this notch 522, the resin wire 52 holds the coaxial line 51 approximately at the center of the shaft core. In addition, the opposing walls of the notch 522 are tapered toward the mouth so that the coaxial line 51 does not fall off. The resin wire 52 has a rack portion 521 that engages with the pinion gear 2 on the outer circumferential surface of the opposite side 1800 from the opening of the notch portion 522 . Further, on the opposite side of the trough portion 1800 of the rack portion 521, the same number of notches 523 as the trough portions of the rack portion 521 are provided to facilitate bending of the cable 5.

As shown in FIG. 2, the casing 1 is provided with a bobbin part 11 that stores the cable 5 wound up by the pinion gear 2.
1 in a spiral shape.

Further, the end portion of the cable 5 housed in the bobbin portion 11 is a single coaxial line 51 without the resin wire 52, and is spirally wound around the chamber 11a, and further, one end is connected to the connector 12.

The operation of this embodiment will be explained below.

When a switch (not shown) is input, the motor 31 is driven and the output shaft 311 rotates. This rotation of the output shaft 311 causes the 1 nohm 32 to rotate. Since the worm 32 meshes with the worm gear 33, the A-mgya 33 rotates while being decelerated. This rotates a spur gear (not shown) coaxially supported with the J:RIU A-MGYA 33, and rotationally drives the spur gear 34 meshing with this spur gear. Casing 1
By meshing with the spur gear 34, the pinion gear 2 supported by the
rotate around.

On the other hand, the distal end portion of the cable 1 wound around the bobbin portion 11 is engaged with the lower end of the antenna cord 41, and the rack portion 521 meshes with the pinion gear 2 halfway.

FIG. 1 shows the antenna guide 4 in a folded state. Here, when the pinion gear 2 rotates clockwise, the cable 5 is sent upward and urges the antenna element 41 upward, so that the antenna guide 4 is extended. Also,
When the pinion gear 2 rotates counterclockwise with the antenna guide 4 extended, the cable 5 is moved to the bobbin section]1
The antenna guide 4 contracts as it is wound up and forces the antenna element 41 downward.

When the cable 5 is sent out and wound up, the cable 5 is reliably driven by the pinion gear 2 because the resin wire 52 has a rack portion 521. Furthermore, since the coaxial line 51 is held by the resin wire 52, the cable 5 hardly bends between the pinion gear 2 and the antenna cord 41.
To accurately expand and contract an antenna guide 4. Since the opposing walls of the notch 522 are tapered so that they approach each other toward the opening, the coaxial line 51 does not fall off from the resin wire 52 even if the resin wire 52 is bent.

Furthermore, since the resin wire 52 is provided with a notch 523, the cable 5 is bent and easily meshes with the pinion gear 2.

In addition, in the above embodiment, the rack portion 5 of the resin wire 52
21 and the notch 523 for facilitating bending of the cable 5 are installed at the same position, or, for example, the rack part 521 and the notch 523 are shifted by half a pitch in the length direction, or Even if the shape does not include the notch portion 523, it is of course preferable as long as it can be rolled up.

[Effect 1 Mokubanmei's electric antenna device includes a casing, a pinion gear supported in the casing, a drive unit that drives the pinion gear, and an antenna that has an antenna element at the tip and is extendably installed on the casing. A cable having a guide and a rack part driven by the pinion gear to extend and retract the antenna guide, the cable having an antenna wire having one end attached to the antenna element and holding the antenna wire in a shaft core part. , and a resin wire having a rack portion driven by the pinion gear on its outer peripheral surface, the cable hardly bends between the antenna element and the pinion gear, and the antenna guide can be accurately expanded and contracted.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an electric antenna device according to an embodiment, and FIG. 2 is a cross-sectional view taken along the line C--C. FIG. 3 is a front view showing a part of the cable, FIG. 4 is a sectional view taken along line AA, and FIG. 5 is a sectional view taken along line B-8. FIG. 6 is a sectional view showing the coaxial line. 1...Casing 3...Drive part 41...Antenna element 5]...Coaxial line 521...Rack part 2...Pinion gear 4...Antenna guide 5...Cable 52... resin wire

Claims (1)

[Claims] (1) A casing, a pinion gear supported in the casing, a drive unit that drives the pinion gear, an antenna guide that has an antenna element at its tip and is extendably erected on the casing, and is driven by the pinion gear. An electric antenna device comprising: a cable having a rack portion for extending and contracting the antenna guide; the cable includes an antenna wire having one end attached to the antenna element; An electric antenna device comprising: a resin wire having a rack portion driven by the pinion gear.