JPS641776Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an in-vehicle radio installed in a car.

[Prior Art] Traditionally, in-vehicle radios are installed in the center console or under-dutch of a car, and are operated by holding a microphone connected to the main body of the radio with a curl cord. . Therefore, if the driver of a car attempts to transmit and receive radio equipment while driving the car,
Operating the radio while driving is extremely inconvenient, as the driver must operate the radio set located far away and also hold a microphone in one hand. Therefore, in order to improve these shortcomings, operability can be improved by installing operation switches, microphones, etc. in the most convenient place for the driver, that is, on the pad of the steering wheel. is possible.
However, conventionally, the pad portion of the steering wheel has only been provided with a simple electrical operating mechanism such as a horn switch. The reason for this is that due to mounting issues, the pad section must be equipped with an extremely simple operating section or display section, and the receiving section, which is the stationary section facing the rotating section of the steering wheel, must be connected to the pad section. The wiring becomes extremely complicated, and in some cases, many sliding contacts are used, which is not desirable in terms of reliability.

[Purpose of the Invention] Therefore, the present invention has been made in order to improve the above-mentioned drawbacks of the conventional technology. An object of the present invention is to provide an on-vehicle radio device that improves the operability of the on-vehicle radio device by directly connecting the section and the main body of the radio device cut into the vehicle body side by a signal transmission line.

[Structure of the Invention] That is, the present invention includes a microphone that converts audio into an electrical signal, an audio frequency amplifier that amplifies the audio signal output from the microphone, and an output signal of the audio frequency amplifier in the pad portion of the steering wheel. A transmission transformer is provided that is insulated in direct current and sent to the transmission line, and a balanced transmission line that transmits the audio signal from the pad section to the steering column is connected to the secondary coil of the transmission transformer, and a receiving end of the balanced transmission line is connected to the secondary coil of the transmission transformer. an audio signal transmission system comprising a receiving transformer that edges the balanced transmission line, and a secondary coil of the receiving transformer connected to an audio signal input terminal of a radio device that transmits and receives signals; and a steering wheel pad. The unit includes an operating switch for operating the radio, a display for displaying the operating state of the radio, and a control signal corresponding to the operating state of the operating switch is encoded and output as serial data, and the display is a first transmission and reception control device that receives a serial control signal that operates the display device and operates the display device;
A transmission/reception control device is provided, the first and second transmission control devices are connected by a data transmission path for transmitting serial data, and the second transmission/reception control device is connected to a control signal input/output terminal of the main body of the radio. The present invention relates to an in-vehicle radio device comprising a connected control signal transmission system.

This invention places the conventional radio device body on the vehicle body side,
The first feature is that the operation section and the display section of the radio main body are provided in the pad section, and the radio main body and the pad section are connected by serial data transmission. Furthermore, a second feature lies in the audio signal transmission system in which a microphone is provided in the pad section and the audio signal converted by the microphone is transmitted to the main body of the radio. That is, in order to reduce induced noise in the audio signal transmission path as much as possible, transmitting and receiving transformers are used to insulate the transmitting section, the transmitting section, and the receiving section from each other in terms of direct current.
The audio signal transmission line is a balanced transmission line to reduce induced noise.

In a preferred embodiment, the balanced transmission line, the data transmission line for transmitting and receiving control data, the power supply line, and the ground line are made of elastic tape wires in which a plurality of conductive wires are molded into a tape shape with synthetic resin. This is formed by loosely spiraling it around the steering shaft. In this way, the reliability of signal transmission can be improved by connecting the rotating pad portion and the non-rotating steering column.

[Examples] Hereinafter, the present invention will be explained in detail based on specific examples.

FIG. 1 is a block diagram showing the configuration of a vehicle-mounted wireless device according to a specific embodiment of the present invention. First, the audio signal transmission system for transmitting audio signals will be explained. On the pad part of the steering wheel,
A microphone 2 that converts the voice of a speaker of a wireless device into an electrical signal, an audio frequency amplifier 4 that amplifies the audio signal converted into an electrical signal by the microphone, and its output is connected to a balanced transmission line 8. A transmission transformer 6 is provided. The microphone is arranged in the pad section as shown in FIG. 2 in order to avoid picking up rotational noise as much as possible when the steering wheel is rotated.

A container 202 for mounting the microphone 2 is provided on the upper surface 64b of the pad of the steering wheel. A vibration isolation wall 204 and a sound isolation wall 206 made of urethane foam or the like are provided on the inner peripheral surface of the container 202. Microphone 2 is
It is attached so as to be set back a certain distance a from the front surface 64b of the boss portion. Further, an air chamber 208 having a certain capacity is provided between the back surface of the microphone 2 and the bottom surface of the soundproof wall 206. In this way, move the microphone back a certain distance from the top of the pad,
Also, by providing an air chamber at the rear, only the audio signal could be detected by the microphone. For example, it was possible to exclude the sliding noise when rotating the steering wheel.

The audio frequency amplifier 4 is provided with a low-pass filter at its input end that passes only audio frequencies, and is further configured to reduce the gain in the high frequency region as a characteristic of the amplifier so as to amplify only the audio frequencies. This electrical circuit diagram is shown in FIG.

The output of the microphone 2 is connected to a low pass filter composed of L1, C1, and C2. This low-pass filter is a circuit for preventing high-frequency signals from going around, and is a filter for passing only audio signals. Moreover, the signal line 301 between the microphone 2 and the low-pass filter 21 is
Shielded wire is used. The output signal of the low-pass filter 21 is input to the audio frequency amplifier 4. The audio frequency amplifier 4 is connected to the feed line 3 from the column side.
21 and ground 323.
The Zener diode ZD1 and the parallel capacitor C5 are a constant voltage circuit for applying a bias to the transistor Tr1. Also capacitor C3, C
7 is a coupling capacitor, the resistor R4 connected to the emitter is a bias resistor, and C6 is a bypass capacitor. Also, transistor Tr1
A capacitor C4 is connected between the base and collector of. The amplification degree of the high frequency portion of the amplifier 4 is limited by the action of the capacitor C4. Therefore, the audio frequency amplifier 4 amplifies only the audio frequency and sends the audio signal to the primary coil 6 of the transmission transformer 6. Transmission transformer 6 and audio frequency amplifier 4
A shielded cable is used for the signal line 322 between the two. Also, the secondary coil 6 of the transmission transformer 6
b and the primary coil 10a of the receiving transformer 10 provided on the steering column 70 are connected by a balanced transmission circuit 8. Also, receiving transformer 1
The secondary coil 0 is connected to the main body of the radio device by a shielded wire 381.

The functions of the transmitting transformer 6 and the receiving transformer 10 are as follows.
The electrical system on the pad side, the electrical system of the radio unit on the vehicle body side, and the transmission line are isolated using direct current, and the balanced transmission line is floated using direct current to balance the line. Therefore, the in-phase induced noise induced in the balanced transmission line is mutually canceled out and is not transmitted to the audio signal input terminal of the main body of the radio. Therefore, one terminal of the primary coil of the receiving transformer connected to the receiving end of the balanced transmission line 8 may be grounded as long as balance can be maintained. The secondary coil of the receiving transformer 10 is connected to the audio input terminal of the main body of the personal radio. Since the audio signal is output to the audio signal transmission path after the audio frequency amplifier 4 amplifies the audio, the S/N ratio of the transmission path is improved.

Next, a control signal transmission system that transmits a control signal for displaying a display provided on the pad portion based on an operation signal for operating the radio device body and a display signal of the radio device body will be described.

An operation switch 22 for operating the radio is provided on the pad. The signal from the operating switch is input to a computer 24 provided in the pad section. Further, a display 26 consisting of an LED is connected to the computer 24. A data transmission line is connected to the computer 24. The data transmission line includes a power supply line 31, signal lines 32a and 32b, and a ground line 33. The amplifier 4, computer 24, and display 26 provided on the pad are supplied with power from an on-vehicle battery 50 via a stabilized power supply circuit 52 and a power supply line 31. Computer Utah 24
is subjected to binary parallel encoding according to the operation state of the operating switch 22, and after converting the binary parallel encoded data into serial data, the signal is transmitted to the computer 26 provided on the vehicle body side through the signal line 32a.
The computer 26 receives data from the computer 24, converts the data into parallel data, decodes the data, and sends a signal to a predetermined control signal input terminal as an operation signal for the main body of the radio. By operating the operating switch 22 in this manner, the personal radio device main body can be remotely controlled. Further, the operating state of the personal radio device is managed by the computer 26.
sends this management data to the computer 24 via the signal line 32b. The computer 24 converts the sent serial data into parallel data, decodes it, and displays a predetermined display on the display 26.

FIG. 4 shows the structure of a tape electric wire in which the above-mentioned balanced transmission line 8 and data transmission lines 31, 33, 32a, 32b, etc. are collectively formed from synthetic resin into a tape shape with elasticity.

The tape electric wire 40 is loosely wound around the steering shaft 60 as shown in FIG.
The tape electric wire 40 is formed by molding a plurality of lead wires together into a tape shape with synthetic resin so as to have elasticity. Connectors 42a and 42b are connected to both ends, respectively.

FIG. 5 is a structural sectional view showing a method of disposing the above-mentioned tape electric wire on a steering wheel.
The steering wheel shown has a structure in which the pads do not rotate. A fixed gear 72 is fixed to the upper part of the steering column 70.
A fixed gear 72 meshes with a lower end gear 74a of a planetary gear 74 rotatably supported by a boss portion 68 of the steering wheel 62. A stationary gear 76 rotatably attached via a bearing is disposed at the upper end of the steering shaft 60, and this gear is connected to the upper end gear 74b of the planetary gear 74.
It fits perfectly. The stationary gear 76 has a pad 64.
is permanently installed. Fixed gear 72 and stationary gear 76
are formed to have the same diameter and the same number of teeth, and the upper and lower end gears 74a and 74b of the planetary gear 74 also have the same diameter and the same number of teeth, so the fixed gear 72 and the stationary gear 76 are held in the same phase. . Therefore, even if the steering wheel 62 is rotated and the steering shaft 60 is rotated, the pad 64 remains in the same phase as the fixed gear 2, that is, remains stationary. The pad 64 includes the above-mentioned microphone 2, audio frequency amplifier 4, transmission transformer 6, operation switch 22, and display 2.
6, a computer 24, etc. are provided. The connector 42a of the tape electric wire 40 is connected to the terminal provided at the lower end of the pad part, and the tape electric wire 40
It is spirally wound and housed in the internal space of the stationary gear 76.
On the other hand, the connector terminal 42b is connected to a connector provided on the boss portion 68 of the steering wheel. On the other hand, a connector for another tape electric wire 41 is similarly connected to the lower surface of the boss portion 68 of the steering wheel, and is housed in the internal space of the fixed gear 72 in a spiral manner. The other terminal of the tape electric wire 41 is connected to the steering column 70.

FIG. 6 shows the configuration of the operation switch 22 and display 26 provided on the pad portion. As operation switches, a reset switch 221, a select switch 222, and a press talk switch 22 are used.
3 is provided. Also, as indicators, there is a ready display 261 that shows the connection preparation state, a talk display 262 that shows the call state, a TX display 264 that shows the state in which radio waves are being transmitted, and an abbreviated number display that shows the abbreviated number of the group number. 263, a power display 265 indicating the ON state of the power source is provided.

[Effects of the invention] As described above, the present invention provides a microphone, an operation switch, and a display in the pad section, transmits audio signals and control signals between the pad and the vehicle body, and transmits a wireless signal from the pad to the vehicle body. This is an in-vehicle radio device that can be operated from the main body. Therefore, according to this device, since the operating section, microphone, etc. are provided in the steering wheel pad, the driver can very easily operate the transmitter/receiver even while driving. . In addition, balanced transmission lines, transmitting/receiving transformers, etc. are used to transmit the audio signal, and it is connected to the audio signal input terminal of the conventional inorganic main body, and is separated from other signal transmission lines, resulting in extremely low noise audio. Can transmit signals. Furthermore, control signals are transmitted and received in the form of serial data by the transmission/reception control device installed on the pad and column side, so even though the number of signal lines is extremely reduced, it is possible to transmit and receive a large number of operation signals. can. Furthermore, reliability is improved because the number of signal lines is small.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an in-vehicle wireless device according to a specific embodiment of the present invention.
Figure 2 is a sectional view showing the mounting structure of the microphone used in the same example, Figure 3 is a detailed circuit diagram of the audio signal transmission system, and Figure 4 is a perspective view showing the configuration of the tape electric wire used in the same example. In the drawings, FIG. 5 is a cross-sectional view of the structure of the steering wheel section for explaining the arrangement of the tape electric wires, and FIG. 6 is a plan view showing the structure of the operation switch and display provided on the pad section. 2...Microphone, 4...Audio frequency amplifier,
6...Transmission transformer, 10...Reception transformer, 8
... Balanced transmission line, 22 ... Operation switch, 26
... Display unit, 24, 26 ... Computer, 32
... Data transmission line, 60 ... Steering shaft, 40 ... Tape electric wire, 64 ... Pad section, 68 ... Boss section, 72 ... Fixed gear, 76 ...
...Stopping gear, 74...Planetary gear.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A microphone that converts audio into an electrical signal, an audio frequency amplifier that amplifies the audio signal output from the microphone, and an output signal of the audio frequency amplifier, in the pad portion of the steering wheel. A transmission transformer is provided that insulates the audio signal in terms of direct current and sends it out to the transmission line, and a balanced transmission line that transmits the audio signal from the pad section to the steering column is connected to the secondary coil of the transmission transformer, and a reception of the balanced transmission line is provided. A receiving transformer is provided at the end to edge the balanced transmission line,
an audio signal transmission system that connects the secondary coil of the receiving transformer to an audio signal input terminal of the radio device that transmits and receives signals; an operation switch for operating the radio device on a pad of the steering wheel; a display for displaying the operating state of the radio, and encoding a control signal corresponding to the operating state of the operating switch;
a first transmission and reception control device that receives a serial control signal that is output as serial data and operates the display, and operates the display; A second transmission and reception control device is provided to perform the operation, and between the first and second transmission and reception control devices,
An in-vehicle radio device comprising: a control signal transmission system connected by a data transmission path for transmitting serial data, and the second transmission/reception control device is connected to a control signal input/output terminal of a main body of the radio device. (2) The balanced transmission line and the data transmission line are formed by arranging a plurality of conductive wires in parallel, molding them into a tape shape with synthetic resin, and spirally threading the wires around the steering shaft. An in-vehicle wireless device according to claim 1, characterized in that it is formed by winding it.