JPH0982434A - Electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic apparatus which can be set in accordance with the destination with simple structure in an electronic apparatus requiring the change of setting in conformity with the destination or the like. SOLUTION: The empty terminal 10e of the connector 8 of a junction cord 6 fitted into the connector 3 of an apparatus main body 1 is utilized, and a voltage applied to the empty terminal 10e in the case of making a cord 7a to which a power source voltage is applied branch and connecting it to the empty terminal 10e and in the case of its being not connected is determined. Therefore, the destination or the like is determined, thereby being able to automatically perform setting in accordance with the destination or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device such as a vehicle audio device.

[0002]

2. Description of the Related Art In an on-vehicle radio receiver, a frequency band, a reception frequency interval, etc. differ depending on the destination. For this reason, conventionally, radio receivers have been designed for each destination. On the other hand, instead of individually designing a radio receiver for each destination, design a radio receiver for multiple destinations in common,
A radio receiver has been proposed in which a common radio receiver can be used for a plurality of destinations by changing the setting of the frequency band and the reception frequency interval according to the destination.

For example, a resistance connecting portion is provided on a printed circuit board of a radio receiver, a resistance having a resistance value preset according to a destination is connected to the resistance connecting portion, and a voltage drop due to the resistance is applied to a microcomputer or the like. There is known a radio receiver that automatically determines a destination by making the above determination and automatically sets a frequency band, a reception frequency interval, and the like according to the destination. In addition, a key matrix circuit for distinguishing the operated key from among the multiple keys provided on the radio receiver is used, and a diode is connected to the key matrix circuit at the location set for each destination. There is known a radio receiver which automatically determines a destination by discriminating a connecting point of the diode with a microcomputer and automatically sets a frequency band, a reception frequency interval and the like according to the determined destination.

Further, conventionally, among the plurality of keys provided in the radio receiver, two specific keys which are predetermined in accordance with the destination are simultaneously operated, so that the destination is determined and the destination is determined. There is known a radio receiver that automatically performs settings corresponding to.

[0005]

However, in the above-mentioned conventional example, a radio receiver having a resistance value corresponding to a destination or a diode connected to a location corresponding to a destination of the key matrix circuit is used. It was necessary to change the circuit configuration according to the destination. Further, when the destination is determined by a specific key operation, the key operation is complicated.

The present invention solves the above-mentioned problems of the prior art, and does not require the electronic device itself such as a radio receiver to be changed according to the destination, and does not require a specific key operation. An electronic device that can automatically set the ground is provided.

[0007]

According to the present invention, there is provided a relay cord having a first connector connected to one end of the relay cord and a second connector fitted to the first connector of the relay cord. And determining means for determining the voltage applied to the vacant terminal of the second connector via the relay cord, and setting means for automatically setting the device according to the determination result of the determining means. It is characterized in that the determination means determines a plurality of different voltage values applied to the vacant terminals of the second connector by changing the connection state of the relay cord.

[0008]

Therefore, according to the present invention, the voltage value of the empty terminal of the connector of the electronic device is determined by the determining means by using the relay code determined according to the destination of the electronic device and the specification / function. As a result, the electronic device can be automatically set to the setting according to the destination and the specifications / functions.

[0009]

1 and 2 show an embodiment of the present invention.
It will be explained together. In addition, this embodiment is a radio receiver,
This is an example of a vehicle-mounted audio device in which a plurality of audio devices such as a cassette deck and a compact disc player are integrated.

In FIG. 1, reference numeral 1 denotes a device body, and the device body 1 accommodates audio equipment such as a radio receiver, a cassette player and a compact disc player. Reference numeral 2 denotes a control circuit including a microcomputer and the like, and the control circuit 2 controls audio equipment such as a radio receiver, a cassette player, and a compact disc player. 2a is a voltage converter that lowers the input voltage. Reference numeral 3 is a male connector connected to an audio device, and the male connector 3 is provided with a plurality of male terminals 4a to 4f. Reference numerals 5a to 5f are a plurality of cords connected to each male terminal 3a. The cord 5e is connected to the voltage converter 2a. 6 is a relay cord, and this relay cord 6 includes a plurality of cords 7a to 7f, a female connector 8,
The female connector 8 comprises a plurality of female terminals 10 which are in contact with the male terminals 4a to 4f of the male connector 3.
a to 10f are provided. The male connector 9 is provided with a plurality of male terminals 11a to 11f. Male terminal 1
Cords 7a, 7b, 7c, 7d and 7f are connected to 1a, 11b, 11c, 11d and 11f, respectively.

The cord 7e is branched from the cord 7a and connected to the female terminal 10e of the female connector 8. 12
Is a female connector that fits with the male connector 9 of the relay cord 6, and this female connector 12 has a plurality of female terminals 13a.
.About.13f are provided. Reference numeral 14 denotes a battery installed in an automobile, and the positive electrode of the battery 14 is connected to one female terminal 13a of the female connector 12 via an accessory switch 15. Also, female terminal 13b
Is directly connected to the positive electrode of the battery 14.

FIG. 2 shows the front of the male connector 3 of the device body 1. In FIG. 2, reference numeral 16 denotes a connector main body, and one surface of the connector main body 16 has the male terminal 4a.
4f are arranged in two rows. Female terminals 10a to 1 of the female connector 8 of the relay cord 6 fitted to the male connector 3
Similarly, 0f is also arranged in two rows on the connector body. Similarly, in the male connector 9 and the female connector 12, the male terminals 11a to 11f and the female terminals 13a to 13f are arranged in two rows. The male terminal 11e of the male connector 9 and the female terminal 13e of the female connector 12 are both empty terminals.
They are fitted together but do not contribute to the electrical connection.

In FIG. 2, the male terminal 4a is a power supply terminal, 4b is a backup power supply terminal for supplying power to the control circuit 2 of the device body 1 regardless of whether the accessory switch 16 is on or off, and 4c and 4d are acoustic terminals. Output terminal, 4
e is a destination, a terminal for determining the specifications / functions of audio equipment,
4f is a ground terminal.

Next, the operation of the above embodiment will be described. In FIG. 1, the male connector 3 of the device body 1 of the audio equipment installed at a predetermined location in the vehicle compartment and the female connector 8 of the relay cord 6 are fitted together, and the male connector 9 and the female connector 12 of the relay cord 6 are connected. The device body 1 is ready to be operated by fitting. Accessory switch 1
When 5 is turned on, the voltage of the battery 14 changes to the accessory switch 15, the female terminal 13a of the female connector 12, the male terminal 11a of the male connector 9, the cord 7a, the cord 7e, the female terminal 10e of the female connector 8 and the male connector 3 of the male connector 3. Terminal 4
It is applied to the voltage converter 2a via e and the cord 5e.
The voltage converter 2a lowers the applied power supply voltage, and the lowered voltage is applied to the control circuit 2. Control circuit 2
Judges the destination and the specifications / functions of the audio equipment by judging the applied voltage value by the judgment circuit formed in the control circuit 2, and the frequency band and reception by the automatic setting circuit formed in the control circuit 2. The frequency interval is automatically set. If the cord 7e is not branched from the cord 7a but is branched from the cord 7f (branched as shown by the broken line in FIG. 1), the male terminal 4e of the male connector 3 becomes the ground potential, and this potential The control circuit 2 makes a decision to automatically set other destinations.

As described above, in the above embodiment, the empty terminal of the connector is used, and the cord connection state of the relay cord is changed so that the voltage corresponding to the destination is applied to the empty terminal. The main body 1 does not need to be changed at all depending on the destination.

FIG. 3 shows another embodiment of the present invention. In this embodiment, two free terminals of the relay cord 6 are used, and as shown in FIG. 3, the control circuit 2 can determine whether or not the free terminals 10f and 10g are connected by the cord 7e. When the ground potential is detected as shown in FIG. 3, the destination A and the empty terminal 10f and 10g are not connected to the destination B, and the cord 7e branched from the cord 7a is connected to the empty terminal 10e. When the power supply voltage is applied to the vacant terminal 10e, the destination C can be set. By determining the voltage applied to the male terminal 4e of the male connector 3 by the control circuit 2, the destination can be set. The determination can be made and the setting according to the destination can be automatically performed.

The automatic setting circuit included in the control circuit 2 is provided with a storage circuit in which a plurality of sets of data corresponding to destinations, specifications, and functions are stored, and the storage circuit is determined according to the determination result by the determination circuit. The data is read from and set.

In the above embodiment, the frequency band, the receiving frequency interval, etc. are mainly set automatically according to the destination, but the antitheft function is not limited to the frequency band, the receiving frequency interval. The present invention can also be adopted to set specifications and functions such as whether or not the communication bus system is used and designation of a communication bus system to be used.

[0019]

As is apparent from the above-described embodiment, the present invention is completely the same in the main body of the device, and only by using the relay cord having a different connection state depending on the destination, etc. This has an advantage that the setting according to the ground etc. can be automatically performed.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of an electronic device according to an embodiment of the present invention.

FIG. 2 is a front view of a connector of a relay cord used in the embodiment.

FIG. 3 is an electric circuit diagram of an electronic device according to another embodiment of the present invention.

[Explanation of symbols]

 1 Device Main Body 2 Control Circuit 3 Male Connector 6 Relay Code 7a to 7f Code 8 Female Connector 9 Male Connector 12 Female Connector 14 Battery

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuyuki Fujihira No. 3-1, Tsunashima Higashi 4-chome, Kohoku Ward, Yokohama City, Kanagawa Matsushita Communication Industrial Co., Ltd.

Claims (3)

[Claims] 1. A relay cord to which a first connector connected to one end of the relay cord is connected, a second connector fitted to the first connector of the relay cord, and the relay cord via the relay cord. It comprises a judging means for judging the voltage applied to the vacant terminal of the second connector, and a setting means for automatically setting the device according to the judgment result of the judging means, and changes the connection state of the relay cord. By the second
The electronic device characterized in that a plurality of different voltage values applied to the empty terminals of the connector are determined by the determination means. 2. A case where a predetermined code of a relay cord to which a power supply voltage is applied is connected to an empty terminal of the first connector,
The determination means determines the voltage applied to the vacant terminal of the second connector when not connected.
Electronic device as described. 3. The determination means determines the voltage applied to the vacant terminal of the second connector when the predetermined code of the relay cord to which the ground potential is applied is connected to the vacant terminal of the first connector and when it is not connected. The electronic device according to claim 1, wherein the electronic device determines.