JP3394150B2 - Remote control device connection status detection circuit - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection state detecting circuit for a remote controller used by connecting to an electronic device.

[0002]

2. Description of the Related Art As a conventional remote control device, it is inserted between a main body of a portable electronic device (for example, a portable CD, an MD (mini disk), a cassette player, etc.) and a headphone cord-connected to the main body, and an LCD. There is a type having a display unit such as (liquid crystal display). FIG. 3 is a circuit diagram showing an example of a conventional remote controller of this type. In FIG. 3, reference numeral 1 is a portable electronic device main body, and 11 is a remote controller. The main body 1 includes a battery 2, a stabilized power supply circuit 3, a start-up circuit 4, a control microcomputer 5, a voltage dividing circuit 6, amplifiers 7 and 8, jacks 9 and 10, and other components necessary for main body operation (not shown). ). The remote control device 11 is an LCD
The driver 12, the LCD 13, the key input unit 14, the volume variable resistors 15 and 16, and the plugs 17 and 18 are included.

When using the remote control device 11, the plug 1
7 and 18 are inserted into the corresponding jacks 9 and 10 of the main body 1, and the V _DD terminal, the DATA terminal and the GND terminal of the plug 17 are the V of the corresponding jack 9, respectively.
It is connected to the _DD terminal, DATA terminal and GND terminal, and also the L terminal, R terminal, KEY terminal and GN of the plug 18.
D terminals are L terminals and R terminals of the corresponding jacks 10, respectively.
It is connected to a terminal, a KEY terminal, and a GND terminal. Also,
Variable resistors 15 and 16 for volume of the remote control device 11
To the movable terminals of L and R of the headphone circuit 19, respectively.
The channel headphones 19L and 19R are connected.

Therefore, the key switches S1 to S3 of the key input unit 14 with the respective plugs inserted into the respective jacks.
When any one of them (for example, S1) is pressed, the resistors R1 to R3
One of (R1 <R2 <R3) (for example, the resistor R1) is grounded, and the base of the transistor Q1 of the starting circuit 4 of the main body 1 is the resistor 12, the KEY terminal of the jack 10, the plug 1
Since the KEY terminal 8 is grounded via a grounded resistor (for example, the resistor R1), the pnp-type transistor Q1 is turned on, and then the npn-type transistor Q2 is also turned on and the chip enable terminal ( When CE (bar) becomes "low" level, the power supply circuit 3 switches to the active state, the power supply voltage V _DD is output from the output terminal thereof, and each part of the main body 1 and the remote control device 11 becomes active. At this time, the power supply voltage V _DD is divided by the grounded resistance and the pull-up resistor R0 forming the voltage dividing circuit 6 on the main body side, and a voltage value lower than the power supply voltage VDD is input to the input port KEY of the microcomputer 5. Is also supplied.

Therefore, the microcomputer 5 is provided with a built-in voltage detection unit (A / A) connected to the input port KEY.
A general configuration including a D (analog / digital) converter and the like (not shown here) detects that a key switch has been pressed, and a "high" level signal is output from the power control port PC, and the transistor Q2 is output. Is kept on, and which key switch is pressed is detected based on different voltage division values input to the input port KEY. That is, as shown in the voltage waveform diagram of FIG. 4, for example, at time t3, the key switch S1
When is pressed, the divided voltage of the voltage dividing circuit 6 is V1 (= V _DD ×
R1 / (R1 + R0), and similarly, the key switch S2 at time t4 and the key switch S at time t5.
When 3 is pressed, the divided voltage of the voltage dividing circuit 6 is
V2 (= V _DD × (R1 + R2) / (R1 + R2 + R
0), V3 (= V _DD × (R1 + R2 + R3) / (R1 +
R2 + R3 + R0). The control microcomputer 5 controls the main body 1 so as to change the operating state according to each voltage value.

When any of the key switches S1 to S3 is pressed to change the operating state of the main body 1, the display data for displaying the changed operating state on the LCD 10 is
It is transmitted from the output port DATA of the microcomputer 5 to the LCD driver 12 of the remote controller 8 via the DATA terminal of the jack 9 and the DATA terminal of the plug 17,
It is displayed on the LCD 13.

[0007]

However, in the above-mentioned configuration, the start-up circuit 4 of the main body 1 is activated by simply inserting / removing the plug of the remote control device 11 into / from the jack of the main body 1, and the power-on state is set to the operating state. There was a problem that it might become. For example, in the process of inserting the plug 18 of the remote controller 11 into the jack 10 of the main body 1, as shown in FIG. 5, the L terminal of the plug 18 is connected to the KEY terminal of the jack 10 and at the same time the R terminal of the plug 18 is connected. Is caused by the state of being connected to the GND terminal of the jack.

In this state, the KEY port of the control microcomputer 5 is the backflow prevention diode D1, the KEY terminal of the jack 10, the L terminal of the plug 18, the variable resistor 15 for volume, the L channel headphones 19L, R.
Since it is grounded via the channel headphone 19R, the variable resistor 16 for volume, the R terminal of the plug 18, and the GND terminal of the jack 10, the resistance value R _{X of the} variable resistor for volume and the resistance value RL of the L channel headphone 19L.
When the combined resistance value of the resistance value RR of the R channel headphone 19R and the resistance value RR of the R channel headphone 19R coincides with the resistance value of any one of the resistances R1 to R3 of the key switch, the starting circuit 4 operates even if the key switch is not pressed. At the same time as switching to the active state, the microcomputer 5 erroneously detects that the key switch has been pressed.

For example, if the combined resistance value of the series connection matches the resistance value of the resistor R1 (R1 = 2R _X + R _L + R _R ), the plug 18 of the remote control device 8 is connected to the main body 1 as shown in FIG. At a time t1 during insertion into the jack 10, a voltage equal to the divided voltage V1 is supplied to the base of the transistor Q1 of the starting circuit 4, so that the power supply circuit 3 becomes active, and then the key switch 1 is turned on. Even if the key switch S1 is not pressed, the operating state becomes when the key switch S1 is pressed.

When the plug 17 of the remote control device 11 is unplugged from the jack 9 of the main body 1 during operation, the remote control device 1
There was a problem that the power supply to 1 was cut off, the display on the LCD 10 disappeared, and then the display did not return even if the plug 17 was plugged into the jack 9 again.

An object of the present invention is to provide a connection state detection circuit for a remote control device which solves the above-mentioned conventional problems.

[0012]

A connection state detecting circuit of a remote control device according to the present invention is a key input device having a plurality of keys.
Key input means connected to a remote control device equipped with force means
Configured to change the operating state according to the operation of each key
The connection state detection circuit of the remote control device of the electronic device
The electronic device is connected to the remote control device and key input
The remote control device is turned on in response to the operation of any key of the means.
The power supply terminal for supplying the source voltage and each key of the key input means.
Voltage detection that detects the voltage value generated according to the operation of the
Section and key input means are generated according to the operation of each key
Control means for controlling the operation of the electronic device based on the voltage value;
The remote control device includes an electronic device and a predetermined terminal.
Connected according to the specified power supply from the electronic device.
Equipped with a connection state detection circuit that generates a voltage value
The voltage detector recognizes the voltage value generated by the output circuit
Then, the control means operates the electronic device based on the recognition result.
It controls.

In addition, the connection state detection circuit of the remote control device according to the present invention is a display device that displays the operating state of the electronic device.
The electronic device is equipped with a stage and is generated by a connection state detection circuit.
Based on the recognition result of the voltage value
Data transfer means.

[0014]

In the remote controller used by connecting to the main body of the electronic device, the remote controller is provided with the connection state detecting means for detecting the connection state, and the operation state of the main body can be changed by operating the key only when the detection output is provided. . Further, when the connection state detection output is generated, the display data is retransferred to the display means.

[0015]

1 is a circuit diagram showing an example of a remote control device according to the present invention. In FIG. 1, the same components as those of FIG. 3 are designated by the same reference numerals and described. In FIG. 1, in addition to the same components as the circuit of FIG.
n-type switching transistor Q3 and resistors R21 and R2
A connection state detection unit 20 composed of R2 and R23 is additionally connected to the voltage dividing circuit 6. The resistance value of the resistor R21 is selected to be larger than any of the resistors R1 to R3 of the key input unit 14.

Therefore, the plugs 17 and 18 are connected to the jack 9
When any one of the key switches S1 to S3 is pressed by inserting the power supply voltage VDD into the main body 1 and the remote control device 11, the power supply voltage VDD is supplied to the main body 1 and the remote control device 11 as described above. At this time, since the bias voltage is supplied to the base of the transistor Q3 of the connection state detection circuit 20 via the resistor R22, the transistor Q3 is turned on and the KE of the control microcomputer 5 of the main body 1 is turned on.
Y input port is a backflow prevention diode D1, jack 1
0 KEY terminal, plug 18 KEY terminal, resistor R21
And is grounded through the transistor Q3. Therefore, the divided voltage V0 = V _DD · R21 / (R21 + R0) by the resistors R0 and R21 is supplied to the KEY input port of the control microcomputer 5, as shown in FIG. The control microcomputer 5 has an input port KE
With the built-in voltage detection unit connected to Y, this divided voltage V
0 is recognized as a voltage indicating that the remote control device 11 is connected to the main body 1. Then, after the recognition, the control microcomputer 5 operates the main body 1 according to the divided voltage corresponding to the pressed key switch. In other words, the control microcomputer 5
Does not operate the main body 1 without the recognition.

On the other hand, when the operating state of the main body 1 changes in response to the pressed key switch, display data for displaying the changed operating state is stored in the internal memory (not shown) of the control microcomputer 5. At the same time as being stored, it is transferred from the output port DATA of the microcomputer 5 to the LCD driver 12 of the remote control device 11 via the DATA terminal of the jack 9 and the DATA terminal of the plug 17, and is displayed on the LCD 13.

Next, when the plug 17 of the remote control device 11 is unplugged from the jack 9 of the main body 1 during operation, the remote control device 1
Although the power supply to 1 is cut off and the display on the LCD 10 disappears, the stabilized power supply circuit 3 is still maintained in the active state. Therefore, when the plug 17 is plugged into the jack 9 again, the parts of the remote control device 11 are The power supply voltage is supplied and the input port KE of the control microcomputer 5
Since the divided voltage V0 is supplied to Y, the control microcomputer 5 recognizes that the remote control device 11 is connected to the main body 1, and based on this recognition, displays the display data stored in the internal memory to DATA. Retransfer from the terminal to the LCD driver 12 via the jack 9 and the plug 17,
Display on the LCD 13.

As described above, the connection state detection circuit 2
By adding 0, the electronic device main body 1 does not become in the operating state only by inserting / removing the plug as in the conventional case, and the connection state of the remote control device 11 can be detected. The display data can be retransmitted to restore the display, and the display does not malfunction. Further, it is possible to detect the pull-in of the remote control device without increasing the mechanical contacts of the jack or the number of poles.

[0020]

The present invention can be applied to a karaoke microphone having a remote control function. Further, when the main body has a display function, it is possible to change the display on the main body side by detecting the disconnection of the remote control device. Further, it is also possible to detect the removal of the remote controller and prohibit the main body key or change the function of the main body key.

[0021]

According to the present invention, it is possible to detect the connection state of the remote control device to the electronic equipment body.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a connection state detection circuit of a remote control device according to the present invention.

FIG. 2 is a voltage waveform diagram in FIG.

FIG. 3 is a circuit diagram showing an example of a conventional remote control device.

FIG. 4 is a voltage waveform diagram in FIG.

FIG. 5 is a schematic diagram illustrating a process of inserting the plug and the jack in FIG.

[Explanation of symbols]

1 Electronic device body 2 batteries 3 stabilized power supply circuit 4 Starting circuit 5 Microcomputer for control 6 voltage divider 7 amplifier 8 amplifiers 9 Jack 10 Jack 11 Remote control device 12 LCD driver 13 LCD 14 Key input section 15 Volume variable resistor 16 Volume variable resistor 17 plug 18 plugs 19 headphone circuit 20 Connection status detection circuit

Claims (2)

(57) [Claims] 1. A key input means having a plurality of keys is provided.
Each key of the key input means connected to a remote control device
Power that is configured to change the operating state in response to
A connection state detection circuit for a remote control device of a slave device,
The electronic device is connected to the remote control device, and the key
The remote controller according to the operation of any key of the input means
The power supply terminal that supplies the power supply voltage to the device and the key
Detects the voltage value generated according to the operation of each key of the force means
To operate the voltage detector and each key of the key input means.
Operation of the electronic device based on the voltage value generated according to
And a control means for controlling the
The electronic device is connected to the electronic device through a predetermined terminal.
A connection that generates a predetermined voltage value based on the power supply from the device.
The connection state detection circuit is provided, and the connection state detection circuit is provided.
The voltage detection unit recognizes the generated voltage value and recognizes this
Based on the result, the control means controls the operation of the electronic device.
To detect the connection status of the remote control device.
Road. 2. The remote control device operates the electronic device.
The electronic device is provided with a display unit for displaying a work state.
The recognition result of the voltage value generated by the connection state detection circuit
Means for transferring display data to the display means based on the result
The remote controller according to claim 1, further comprising:
Connection state detection circuit.