JPH0113444Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to the invention of a control mechanism for extending and retracting an electric antenna for a vehicle, and is a mechanism that can realize accurate switch operation at all times in an electric antenna for a vehicle that extends and contracts. This is what we are trying to provide.

Various methods have been used in the past to extend and retract an in-vehicle antenna using an electric motor, but in this case, when the power to the electric motor is turned on, the antenna is extended by a predetermined amount, and the antenna is completely retracted. It is necessary to turn off the power supply circuit leading to the electric motor in order to achieve a preferable automatic telescopic operation, and what has been conventionally adopted to realize such an operation is to turn off the power circuit leading to the electric motor to perform the telescopic operation. The cam body is rotated in conjunction with the cam body, and the power supply circuit is turned off at a predetermined rotation angle of the cam body. However, in such conventional devices, it is essential to use a clutch mechanism in the rotational conduction system for the above-mentioned antenna expansion and contraction operations, and furthermore, the operation of such a clutch mechanism enables the on-off operation of the power supply circuit. Therefore, it is difficult to obtain accurate expansion and contraction operations. In addition, as mentioned above, when a cam is used to turn on and off a switch in a power supply circuit, it is assumed that the switch is always elastically in the on state, and this switch is extended by a rotating cam that is linked to the expansion and contraction operation of the antenna. The switch mechanism is complicated and large because it is necessary to turn it off at the extended and contracted limits.Especially in today's complex conditions of broadcasting organizations, there is a possibility of duplicate reception in the area, and the antenna is in the fully extended position. Since this is noticeable at night, it is essential to have the antenna in a half-extended state.
For this purpose, it is necessary to use at least a plurality of switch mechanisms, and the configuration becomes complicated.As a result, the rotating cam and switch for turning on and off the power supply circuit are housed inside a general antenna telescopic case. It would be impossible to provide such a device, and the design would be difficult.

The present invention was devised after repeated studies in view of the above-mentioned actual circumstances. That is, in order to eliminate the above-mentioned disadvantages, the inventors of the present invention have conducted research on performing the above-mentioned on/off operations using magnetism, light, or other means, but all of these methods involve technical difficulties and are expensive. I don't get it. Therefore, in order to obtain appropriate operation at low cost, wires for telescopically extending and retracting multiple antenna elements are extended and retracted via an interlocking mechanism that is operated by forward and reverse rotation of a motor. In the device capable of operating, a rotary contact piece is provided coaxially with any rotating member forming the interlocking mechanism, and a plurality of contacts are arranged on the rotary contact piece, and the rotation of the rotary contact piece is an electronic control circuit that sends energization intermittently obtained at the plurality of contacts as a pulse signal due to the
The electronic control circuit is provided in the power supply circuit for the motor, and the motor drive is stopped according to the number of pulses counted by the electronic control circuit, and the antenna is automatically expanded and contracted, thereby achieving a simple and compact design. With this configuration, we succeeded in automatically extending and retracting the antenna described above at low cost.

To explain a specific embodiment of the present invention as shown in the attached drawings, as shown in FIG. 12, and a case 10 with a telescoping operation mechanism attached to the lower end of the antenna storage tube 12 is attached to a car body fender 20, as is generally done in the past. In the present invention, in the case 10 as described above, an intermediate partition wall 10a is formed as shown in FIGS. 2 and 3, and a wire 2 for expanding and contracting the antenna element 11 is provided on one side of the intermediate partition wall 10a. A drum 3 for storing the wire 2 is formed on the other side peripheral side.
is provided. Gear chamber 10b as described above
a helical gear 21 that engages with a motor-driven gear (not shown) and rotates with the forward and reverse rotation of a motor 30, which will be described later; a small gear 22 that is coaxial with the helical gear 21; a large gear 23 that engages with the small gear; Coaxial small gear 2
4 is provided on one side, as shown in FIG. 3, and they form an interlocking mechanism that reduces speed. The small gear 24 has a wire drive gear that engages with the wire 2 25 is engaged, and the gear 2
A presser roller 26 is separately attached to the presser roller 26 and the wire 2 is connected to the presser roller 26.
is inserted so that the wire 2 is fed out or retracted by the rotation of the drive gear 25, thereby causing the antenna element 1 as described above.
The expansion and contraction of 1 is planned.

However, in the present invention, the gears 23, 2 as described above are not used.
A rotary shaft 7 is formed coaxially with the rotary shaft 4, and the rotary shaft 7 protrudes to the other side of the intermediate partition wall 10a, that is, to the winding drum 3 side, and a rotary contact piece 8 is attached to the tip thereof. However, in the rotation range of the rotary contact piece 8, a plurality of contact points 9 are provided radially as shown in FIG. The rotating shaft 7 is formed of a conductor such as a metal, and is rotatably provided as described above by being inserted into the wiring board 5 attached to the back side of the intermediate partition 10. The fact that a contact piece 6 is provided on the wiring board 5 so as to be in contact with such a rotating shaft 7 is in addition to the fourth and fifth points.
As shown in the figure, the wiring board 5 is further connected to a separately formed electronic control circuit. This electronic control circuit generally consists of a noise discrimination circuit, a panel discrimination circuit, a counter, a decoder, an AND gate, and an inverter. By removing noise etc., a noise-free signal is obtained at the output, and by setting the output pulse width to be larger than the signal repetition period using a monomulti in the pulse discrimination circuit, the input signal is A command is issued to drive the relay while the signal is coming in, and if the signal is not coming in due to an antenna failure, the relay is deactivated after the last signal is received and the set pulse width is output. The counter is a circuit that counts the number of input pulses and adds or subtracts the next pulse from the count number in the standby state. The decoder stores the number of pulses for full expansion/contraction and half expansion/contraction of the antenna, and depending on each input signal, signals such as operation of the rising side relay, operation of the falling side relay, up count, down count, and counting stop are generated. In addition, an AND gate produces an output when two input signals are at a high level, and there is no output when one of the input signals is at a low level or when both are at a low level. When the signal is at a high level, the output is at a low level, and when the signal is at a low level, a high level is output.

The circuit of the above-mentioned arranged contact 9 is as shown in FIG. 6, and one of the circuit configurations between this and the motor 30 is as shown in FIG. A rotating contact piece 8 is connected to the rotary contact piece 8, and a positive potential is supplied to the pulse circuit by a semiconductor 31 such as a organizing diode, and when the motor 30 rotates in the normal direction, the antenna element 11 is extended. It is configured to contract in reverse. The rotating contact pieces 8 described above are proportional to the number of rotations by the motor 30, that is, the speed-reduced rotation by the drive gear 25, and therefore the number of rotating contacts 8 generated is proportional to the number of rotations of the motor, and is relatively simple and inexpensive as shown in FIG. 8A. From such an input, it is possible to obtain an output as an accurate pulse signal as shown in FIG.

In addition, the arrangement contact 9 as shown in FIG. 4 or FIG.
In some cases, as shown in FIG. 9, a tooth-shaped contact 9 may be formed on the inside thereof, and a pulse deriving ring 15 is provided concentrically therein, and this pulse deriving ring 15 and the contact 9, 9..., that is, as shown in FIG. 10, both ends of the rotary contact piece 8 are bent to form contact parts 8a, 8b,
The lead-out ring 15 and the contact point 9 are brought into contact at these contact portions 8a and 8b. Instead of drawing such contacts 9 and pulse deriving ring 15 on the wiring board 5, they may be formed of a metal plate and fixed as shown in FIGS. If the contacts 9 or the lead-out ring 15 of the substrate 5 as shown in FIGS. 9 and 10 are thin layers and are not suitable for durability, a preferable mechanism can be achieved by using metal plates as shown in FIGS. 11 and 12. can get.

According to the present invention as explained above, the expansion and contraction of the antenna is started by starting the motor for driving the antenna expansion/contraction operation wire, and an appropriate pulse signal is obtained by rotation of one of the rotating parts of the interlocking rotating body. This pulse signal can be sent to an electronic control circuit to count the number of pulses and automatically stop the expansion and contraction of the antenna.Moreover, its configuration is simple, with a rotating contact on the wiring board. Since it is only necessary to provide a motor, it can be effectively installed in a mechanism case containing a normal motor, and the desired automatic control can be achieved at a relatively low cost, which is highly effective in practice. It is an idea.

[Brief explanation of the drawing]

The drawings show the technical contents of the present invention, and Fig. 1 is a side view of the entire vehicle antenna extension/retraction mechanism, Fig. 2 is a sectional view of the antenna extension/retraction case along line 3, and Fig. 3. 4 is a plan view of the contact and rotating contact piece, FIG. 5 is a side view, FIG. 6 is a circuit diagram of the part, and FIG. 7 is a diagram of the part shown in FIG. 6. An explanatory diagram showing an example of the circuit configuration for the motor part of the circuit, Fig. 8 is an explanatory diagram of the output waveform by the rotating contact piece, and Figs. 9 to 12 are respectively modified examples of the rotating contact piece and the contact part thereof. FIG. In these drawings, 2 is an antenna expansion/contraction wire, 5 is a wiring board, 7 is a rotating shaft, 8 is a rotating contact piece, 9 is a disposed contact, 11 is an antenna element, 25 is a wire drive gear, and 30 is a The motors are shown respectively.

Claims (1)

[Scope of utility model registration request] A wire for extending and retracting a plurality of antenna elements in a telescopic manner can be extended and retracted via an interlocking mechanism operated by forward and reverse rotation of a motor, wherein the interlocking mechanism is A rotary contact piece is provided coaxially with any of the rotating parts to be formed, and a plurality of contacts are arranged on the rotary contact piece, and the rotation of the rotary contact piece causes the plurality of contacts to intermittently It has an electronic control circuit that sends the obtained energization as a pulse signal, and the electronic control circuit is provided in the power supply circuit for the motor, and the motor drive is stopped at the number of pulses counted by the electronic control circuit, and the antenna is automatically activated. 1. A vehicle-mounted electric antenna expansion/contraction operation control mechanism, characterized in that the electric antenna expansion/contraction operation is performed in a flexible manner.