JPH1125582A - Remote controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote controller capable of reducing a structual burden. SOLUTION: On the side of a main body 10B, a key input terminal of a system controller 12 is pulled up by a resistor R0 , and is also connected with a key input line 54 of a cord 50, and a transistor switch circuit 24 for switching on/off by L and H of a data output terminal is provided between a power source VDD and the key input line 54, and then a driver circuit 22 whose output becomes L and H by L and H of the data output terminal is provided between the data output terminal and the cord 50. On the side of a manual operator 30B, a combination circuit of connecting up keys 31-33 and resistors R1 -R3 in a ladder shape is connected between the key input line 54 of the cord 50 and a ground, and a data input terminal of a display controller 35 is connected to the data line 55 of the cord 50. Furthermore, the data line 55 and the key input line 54 are connected via 1st and 2nd reverse-blocking diodes D1 and D2 respectively to a power supply line 36, and a capacitor C is connected between the power supply line 36 and the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control device, and more particularly, to a portable music player or the like, in which a main body and a local operation device are connected by a cord, and a power supply of the local operation device is transmitted from the main body via the cord. The present invention relates to a remote control device supplied to a hand-held operation device.

A portable CD player comprises, for example, as shown in FIG. 5, a main body 10, a hand controller 30, a cord 50, and an earphone (not shown).
A CD playback unit 11 for playing back a CD, a system controller 12 having a microcomputer configuration for controlling the operation of the CD playback unit 11,
A power supply unit 13 for supplying a power supply V _DD to the main body 10 and the hand controller 30 and a jack terminal 14 are provided. The system controller 12 has a key input terminal K-IN, which is an A / D conversion port, and a data output terminal D-OUT capable of outputting serial data in negative logic. The key input terminal K-IN is connected to a resistor R _{0. Is} pulled up to the power supply _VDD . The jack terminal 14 has a six-pole configuration, and among the audio outputs of the CD playback unit 11, spring contacts 15 and 16 connected to the hot outputs of the Lch and Rch audio signals, and Lch and Rch.
Contact 17 connected to the common cold output of the audio signal, and spring contact 1 connected to the key input terminal K-IN
8, a spring contact 19 connected to the data output terminal D-OUT,
It has an earth ring 20 connected to the earth.

The cord 50 has Lch and Rch hot signal lines 51 and 52, a cold signal line 53, a key input line 54, a data line 55, and a ground line 56, and is detachably connected to the jack terminal 14 at one end. Is provided. The plug 57 has spring contacts 15 to 19 and pin contacts 58 to 63 that make contact with the earth ring 20. The hot signal lines 51 and 52, the cold signal line 53, the key input line 54, the data line 55, It is connected to an earth line 56.

The hand controller 30 is provided integrally in the middle of the cord 50, and the other end of the cord 50 is connected to an earphone (not shown). The hand controller 30 has a PL
AY key 31, STOP key 32, a combination circuit that the pause key 33 and the resistor R ₁ to R ₃ formed by connecting ladder is connected between the key input line 54 of the cord 50 ground. Also, an LC for displaying the operation state of the main body 10
It has a D display 34 and a display controller 35 for controlling the display of the LCD display 34. The data line 55 of the code 50 is connected to the power supply line 36 of _VDD via the reverse blocking diode D. A charging capacitor C is provided between the power supply line 36 and the ground. Resistor between the power supply line 34 and ground R ₄ and transistor Q ₁ is are connected in series, the collector side of Q ₁ is connected to the data input terminal D-IN of the display controller 35 (negative logic). In addition, the base of Q ₁ is resistance R ₅
Via is connected to the data line 55 of the cord 50, the base of Q ₁ - resistor R ₆ is connected between the emitters.

In the portable CD player constructed as described above, when the CD reproducing section 11 is in a stop state, the system controller 12 does not output data and keeps the data output terminal D-OUT at H. This H level is output to the hand controller 30 via the spring contact 19 and the data line 55, charges the capacitor C via the reverse blocking diode D, and supplies V _DD to the power supply line 36. Since there is no data input to the display controller 35, the LCD display 34
Does not display anything.

When all keys are released, the main body 10
Input of the input voltage V _IN of the key input terminal K-IN system controller 12 is V _DD, the PLAY key 31 is pressed, the V _DD as R ₀ and the voltage V ₁ is the key signal pressure in R ₁ min When the STOP key 32 is pressed, V _{DD is changed} to R.
₀ and (R ₁ + R ₂₎ obtained by dividing the voltage V ₂ is input as the key signal, is the pause key 33 is pressed the V _DD and _{R 0 (R 1 + R 2} + R 3) obtained by dividing the voltage V ₃ Input as a key signal. The system controller 12 determines that V _DD > V
th _1> with _{V 1> Vth 2> V 2} > Vth 3> threshold group Vth ₁ in a relation of _{V 3, Vth 2, Vth 3} , key input voltage V _IN of the key input terminal K-IN Is determined.

[0007] When the user presses the PLAY key 31, when V ₁ is inputted to the key input terminal K-IN, the system controller 12 Vth _1> V _IN> Vth ₂ since, PLAY key 3
1 is pressed, and the PLAY is
Control, start playback from the first track, input a subcode, and input serial data indicating the track number and the elapsed playing time. Each time the track number changes or the playing elapsed time changes by 1 second, the data output terminal D Output from -OUT. One data output takes much less than one second. Data spring terminal 19, is input via the data lines 55, R ₅ to the base of Q _1, by turning on and off the Q _1, it is input to the data input terminal D-IN of the display controller 35. The display controller 35 having input the data controls the LCD display 34 to display the music number and the elapsed playing time.

After that, the user presses the pause key 33,
When V ₃ is input to the key input terminal K-IN, the system controller 12 determines that the pause key 33 has been pressed because Vth ₃ > V _IN , and performs pause control on the CD playback unit 11 to perform playback control at that time. And output serial data indicating the song number of the paused part and the elapsed playing time.
Output from D-OUT. Data is input spring terminal 19, via the data lines 55, R ₅ to the base of Q _1, Q ₁
Is turned on and off, the data is input to the data input terminal D-IN of the display controller 35. The display controller 35 which has input the data controls the LCD display 34 to display the music number of the pause portion and the elapsed playing time. after this,
When one second has elapsed, the system controller 12 outputs serial data for instructing to turn off the light, and the display controller 35
Control of the LCD display 34 to turn off the light, and after a lapse of another one second, the serial number indicating the tune number of the pause portion and the elapsed playing time is output again. Display the elapsed playing time. Hereinafter, the same operation is repeated, and the music number of the pause portion and the elapsed playing time are blinked.

When the user presses the pause key 33 again, the system controller 12 performs pause release control.
Resume playback from the pause position. Then, serial data indicating the song number and the elapsed playing time is output every time the song number changes or the playing elapsed time changes by one second.
It is displayed on the D display 34. After this, the user
When the P key 32 is pressed, the system controller 12 determines that the STOP key 32 has been pressed because Vth ₂ > V _IN > Vth ₃ , performs STOP control on the CD reproducing unit 11, and stops data output. Even if the data line 55 repeatedly falls to the L level while the system controller 12 is outputting data, the current consumption of the display controller 35 and the LCD display 34 is as small as several tens of μA, and the charging voltage of the capacitor C is V _DD. , The display controller 35 and the LCD display 34 do not malfunction.

[0010] By the way, if a backlight such as an EL (electroluminescence) element is added to the LCD display 34 so as to make the display easy to see, the hand-held operation device 3 is required.
The current consumption at 0 increases to about several tens mA. In this case, as shown in FIG. 5, the power consumption from the data output terminal D-OUT of the system controller 12 alone cannot cover the current consumption of several tens mA, and the H level is affected by the output impedance of the output terminal D-OUT. And the power supply voltage of the hand controller 30 falls below a specified value.

As a countermeasure, the main body, the hand controller, and the cord are changed as shown in FIG. 6, and in the main body 10A, a spring contact 21 for power supply is added to the jack terminal 14A and connected to V _DD (FIG. The spring contacts 15 to 17 in FIG. 5 are omitted and actually exist), a power supply line 64 is added to the cord 50A, and a pin contact 65 added to the plug 57A is added.
(In FIG. 6, the hot signal lines 51 and 52, the cold signal line 53, and the pin contacts 58, 59 and 60 are omitted and actually exist), and the plug 57A is attached to the jack terminal 14A. At this time, the pin contact 65 is brought into contact with the spring contact 21. Then, in the hand controller 30A, the reverse blocking diode D is removed, and the cord 5
The 0 A power supply line 64 is directly connected to the power supply line 36. Then, a new EL element 37 and a driver 38 for driving the EL element 37 are added, and _VDD is supplied to the driver 38 to drive the EL element 37 to emit light. According to the example of FIG. 6, the power supply V _{DD of the} main body 10A is always supplied directly to the power supply line 36 via the power supply line 64 of the cord 50A. The power supply voltage of the unit 30A does not drop from V _DD . Further, the H level of the output terminal D-OUT of the system controller 12 does not decrease.

[0012]

However, in the example of FIG. 6, since power is supplied from the main body 10A to the hand controller 30A using the dedicated power line 64, the number of core wires of the cord must be increased by one. Since both the jack terminal and the plug are increased by one pole, there is a problem that the load on the configuration becomes extremely large. The present invention has been made in view of the above-described problems of the related art, and has as its object to provide a remote control device that can reduce the load on the configuration.

[0013]

According to a first aspect of the present invention, there is provided a remote controller including one or more operation keys, and a hand-held operation device including an operation-side controller for inputting data and performing a predetermined operation. It has a main body including a main body side controller that inputs a key signal to perform a corresponding predetermined control operation and outputs predetermined data according to the operation state, and a key input line, a data line, and an earth line. The main unit connects the key input terminal of the main unit controller to the key input line of the cord, and also connects to the power supply through a pull-up resistor, and outputs the data output of the main unit controller. The terminal is connected to the data line of the code via the driver circuit. In the local operation device, one or more operation keys and one or more voltage dividing resistors are combined. A connecting circuit is connected between the key input line of the cord and the ground, and when a certain operation key is pressed, a corresponding predetermined divided voltage is input as a key signal to a key input terminal of the main body side controller, The data input terminal of the operation side controller is connected to the data line of the cord, and the power supply line and the data line of the cord are connected via a reverse blocking diode.

When the main body controller of the main body sets the data output terminal to a certain level, the driver circuit outputs the H level as a power supply voltage to the hand controller via the code data line, and the first reverse blocking diode. The power can be supplied to the power supply line via. At this time, since the driver circuit can have a low output impedance, the current consumption capacity of the hand controller can be increased. Therefore, in addition to data transmission using the code data line, it is also possible to supply power with a large allowable current from the main unit to the hand controller, reducing the number of core wires of the cord and the number of poles of jack terminals and plugs. Thus, the burden on the configuration can be reduced.

According to a second aspect of the present invention, there is provided a remote controller according to the first aspect, further comprising a charging capacitor provided between the power supply line of the hand controller and the ground. This makes it possible to stabilize the power supplied to each part of the hand-held operation device, and it is possible to prevent the power supply of the hand-held operation device from being momentarily lowered when the main body outputs data.

According to a third aspect of the present invention, there is provided a remote controller including one or more operation keys, a hand-held operation device including an operation-side controller for inputting data and performing a predetermined operation, and a key signal input. It has a main body including a main body controller that performs corresponding predetermined control operations and outputs predetermined data according to the operation state, a key input line, a data line, and a ground line, and interconnects the hand-held operation device and the main body. In the main unit, the key input terminal of the main unit controller is connected to the key input line of the code, the power supply is connected via a pull-up resistor, and the data output terminal of the main unit controller is connected via a driver circuit. Connected to the data line of the code, and the driver circuit outputs a high level when the main controller does not output data. Further, a switch circuit is provided between the power supply and the key input line of the cord, and the switch circuit is turned off when the output of the driver circuit is at a logic level of H according to the data output from the data output terminal of the controller on the main body. When the output of the driver circuit is at a logical level of L, the switch circuit is turned on. In the manual operation device, a combination circuit of one or a plurality of operation keys and one or a plurality of voltage-dividing resistors is inputted by a code key. Connected between the line and ground, when a certain operation key is pressed, a corresponding predetermined divided voltage is input as a key signal to a key input terminal of the main controller, and a data input terminal of the operation controller Is connected to the data line of the code, and the power supply line and the data line of the code are connected through the first reverse blocking diode. That the supply line and the code of the key input line connected through a second reverse blocking diode is characterized.

When the controller on the main body side of the main body does not output data, the driver circuit outputs the H level as a power supply voltage to the hand controller via the code data line, and supplies the power via the first reverse blocking diode. Power can be supplied to the line. Also, when the main body controller is outputting data, during the same period as when the logic level is not outputting data, the driver circuit outputs the H level as a power supply voltage to the hand controller via the code data line, By supplying power to the power supply line via the first reverse blocking diode and turning on the switch circuit and connecting the main body power supply to the key input line of the cord during a period when the logic level is not outputting data, the main power supply line is connected. In addition, the power supply voltage can be output to the hand controller and supplied to the power supply line via the second reverse blocking diode. The driver circuit can have a low output impedance, and the switch circuit can also reduce the internal impedance (output impedance) seen from the key input line, so that the current consumption capacity of the hand controller can be increased.

The data output from the main controller is sent to the hand controller via a driver circuit and a data line of the code, and is input to the operating controller. At this time, the driver circuit outputs L. However, the power supply line of the hand controller does not fall to zero due to the presence of the first reverse blocking diode. On the other hand, when the controller on the main unit is not outputting data, the switch circuit is off, so if the operation key is pressed, the corresponding divided voltage can be input to the key input terminal of the main controller. In this case, the power supply line of the hand controller does not decrease due to the presence of the second reverse blocking diode. Therefore, in addition to data transmission and key input using the code data line and key input line, it is also possible to supply power with a large allowable current from the main unit side to the hand controller, reducing the number of core wires of the cord and jack terminals. In addition, the number of plugs can be reduced to reduce the structural burden.

According to a fourth aspect of the present invention, there is provided a remote controller according to the third aspect, wherein the main body side controller invalidates a key signal input while outputting data. . As a result, it is possible to prevent the main body controller from confusing the key input and performing an unexpected operation by the user.

According to a fifth aspect of the present invention, there is provided a remote controller according to the third aspect, wherein a charging capacitor is provided between the power supply line of the hand controller and the ground. This makes it possible to stabilize the power supplied to each part of the hand control, and to prevent the power of the hand control from being momentarily lowered when the main unit outputs data, thereby preventing malfunction. Can be.

[0021]

Next, an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a circuit diagram of a portable CD player according to the present invention, and the same components as those in FIG. 5 are denoted by the same reference numerals. In the main body 10B, a driver circuit 22 having a low output impedance is interposed between the data output terminal D-OUT of the system controller 12 and the spring contact 19 of the jack terminal 14. The driver circuit 22 includes an inverter 23 connected to the output side of the data output terminal D-OUT, the power supply V _DD and the PNP transistor Q ₂ and the resistor R ₇ connected in series between the earth, Q ₂ 'emitter - a resistor R ₈ connected between the base, consisting of connected resistors R ₉ Metropolitan between the bases of the output side, Q ₂ of the inverter 23. The inverter 23 is connected to V _DD and ground as a power supply.

When the data output terminal D-OUT of the system controller 12 is at H level, the output of the inverter 23 is at L level.
Level, Q ₂ turns on, and the driver circuit 22 outputs an H level (= V _DD ) under a low output impedance. Conversely, the data output terminal of the system controller 12
When D-OUT is at the L level, the output of the inverter 23 becomes the H level, Q ₂ is turned off, the driver circuit 22 outputs the L level (= zero V) under the low output impedance.
When the system controller 12 outputs data, it outputs serial data in negative logic (1; L level, 0; H level), but the output logic level of the data output terminal D-OUT and the output logic level of the driver circuit 22 are Matches, so
The serial data is output to the hand controller 30B with negative logic.

Spring contact 1 between power supply V _DD and jack terminal 14
8 (key input terminal K-IN of the system controller 12), a transistor switch circuit 24 is interposed. The transistor switch circuit 24 includes a PNP transistor Q connected between the power supply _VDD and the spring contact 18 (key input terminal K-IN of the system controller 12).
₃ and a resistor R ₁₀ connected between the emitter and base of Q _3.
And a data output terminal D-OUT of the system controller 12.
A resistor R ₁₁ Metropolitan connected between the base of Q ₃ and. The transistor switch circuit 24 operates while Q ₃ is on.
The internal impedance (output impedance) seen from the key input line 54 becomes very low.

[0024] When the data output terminal D-OUT of the system controller 12 is H level, Q ₃ is turned off and the transistor switch circuit 24 is released from the spring contact 18 (key input of the system controller 12 K-IN) , The key input terminal K-IN of the system controller 12 is pulled up to V _DD by the pull-up resistor R ₀ ,
The divided voltage corresponding to the key operation of the hand controller 30B can be input to the key input terminal K-IN. System controller 1
When the second data output terminal D-OUT is at the L level, Q ₃ is turned on and the transistor switching circuit 24 supplies the power supply V _DD to the key input line 54 via a spring contact 18 with a low output impedance.

On the other hand, on the hand controller 30B side, the data line 55 of the code 50 is connected to the data input terminal D-IN of the display controller 31. PLAY key 31,
A ladder-shaped combination circuit including a STOP key 32, a pause key 33, and resistors R _{1 to} R ₃ is a code 5
0 is connected between the key input line 54 and ground.
Data input terminal D-IN is pulled down to ground by pull-down resistor R _12. Data line 5 of code 50
5 is connected to the power supply line 36 via a first reverse blocking diode D _1. A charging capacitor C is connected between the power supply line 36 and the ground. Further, the key input line 54 of the cord 50 is connected to the power supply line 36 via the second reverse-blocking diode D _2.

Reference numeral 37 denotes an EL element for illuminating the LCD display 34 with a backlight.
It is always driven. The display controller 35, the LCD display 37, and the driver 38 are connected to a power supply V from a power supply line 36.
_DD is powered. The other components are configured exactly the same as in FIG. In FIG. 1, the spring contacts 15 to 17, the pin contacts 58 to 60, the hot signal lines 51 and 52, and the cold signal line 53 in FIG. 5 are omitted, but actually exist.

Next, the operation of the above embodiment will be described with reference to FIGS. 2 and 3 are flowcharts showing the control processing of the system controller 12, and FIG. 4 is a time chart showing the voltage of each part of the portable CD player. (1) Stop state In the main body 10B, when the CD reproduction unit 11 is in the stop state, the system controller 12 proceeds to step S5 in FIG.
0, NO is determined in S51, no data is output, and the data output terminal D-OUT is at the H level. At this time, the output of the inverter 23 becomes the L level, since Q ₂ is turned on, the driver circuit 22 is the power supply voltage V as the H level
Output _DD under low output impedance. This V _DD is connected to the hand controller 3 via the data line 55 of the code 50.
Sent to the side of 0B, fed to the power supply line 36 with the capacitor C is charged via the reverse blocking diode D ₁ a forward bias is applied (see (1) in FIG. 4).
Since the driver circuit 22 has a low output impedance, the voltage of the power supply line 36 is maintained at a specified value even if a current of several tens mA is consumed on the hand controller 30B side. Therefore, the display controller 35, the LCD display 34, the driver 37,
All the EL elements 36 are in a normal operation state.

On the other hand, when the data output terminal D-OUT is at the H level, Q ₃ is turned off and the transistor switching circuit 24 is electrically disconnected from the spring contacts 18 and the key input terminal D-IN. Therefore, the key input terminal K-IN of the system controller 12 is pulled up to _VDD by the pull-up resistor _R0, so that a divided voltage corresponding to the key operation of the hand controller 30B is input to the key input terminal K-IN. It becomes possible. When no key is pressed, the key input line 54 of the code 50 is at V _DD (see (1) in FIG. 4).

(2) PLAY The system controller 12 periodically reads the input voltage V _IN of the key input terminal K-IN by interrupt processing and compares it with one of the threshold groups Vth _{1 to} Vth ₃ . It is checked whether the key is pressed (step S in FIG. 3).
70-S72, S74, S79). When the user presses the PLAY key 31 in the hand operation unit 30B, the key input terminal K-IN of the system controller 12, the divided voltages V ₁ obtained by dividing the V _DD at R ₀ and R ₁ are input as the key signal You. At this time, the key input line 54 becomes lower than V _DD ,
Since reverse-blocking diode D ₂ is cut off the power supply line 36 and the key input line 54 is reverse biased electrically, not the power supply line 36 is lower than V _DD (FIG. 4 (2) see) . When V ₁ is input to the key input terminal K-IN, the system controller 12
It is determined that the first song has been pressed (steps S70 to S72), and since it has been stopped up to that point, the PLAY control is performed on the CD reproducing unit 11 to reproduce the first song from the beginning (step S73).

(3) Display of PLAY state During reproduction, the system controller 12 inputs a subcode from the CD reproducing unit 11, and outputs serial data indicating the music number and the elapsed playing time, or changes the music number or the elapsed playing time. 1
Every time it changes by seconds, it is output from the data output terminal D-OUT in negative logic (steps S50, S52 to S55 in FIG. 2). The serial data representing the music number and the elapsed playing time is composed of a combination of 1 and 0. In the negative logic, 1 is at L level and 0 is at H level. One serial data output of the song number and the elapsed playing time ends in much less than one second.

During data output, the data output terminal D-OUT
There fall to L level, the output is H-level inverter 23, Q ₂ is turned off, the output of the driver circuit 22 falls to L level, the data line 55 drops to the L level. However, the data output terminal D-OUT becomes the L level, Q ₃ is turned on, and the output transistor switch circuit 24 is a power supply voltage V _DD to the key input line 54 under a low output impedance, the second reverse blocking diode D2 To the power supply line 36 via the Therefore, the power supply line 36 is continuously maintained at V _DD (see (3) in FIG. 4). Also, while the data line 55 falls to the L level, the first
To block the data line 55 and the power supply line 36 electrically reverse blocking diode D ₁ becomes reverse biased,
The voltage of the power supply line 36 does not drop from _VDD to the L level. Further, since the capacitor C is charged to V _DD while the output of the driver circuit 22 is at the H level,
Also the moment that the data line 55 has dropped to the L level, the data line 5 first reverse blocking diode D ₁ becomes reverse biased
5 and the power supply line 36 are electrically cut off, so that the voltage of the power supply line 36 does not drop from _VDD to the L level. Since the internal impedance (output impedance) of the transistor switch circuit 24 is small, the voltage of the power supply line 36 is maintained at a specified value even when a current of several tens mA is consumed on the hand controller 30B side. Therefore, the display controller 35, the LCD display 34, the driver 37, the EL
All of the elements 36 maintain a normal operation state.

During data output, the data output terminal D-OUT
There becomes H level, the output of the inverter 23 is L level, Q ₂ is turned on, the output of the driver circuit 22 rises to H level, the data line 55 becomes the H level. The V _DD via a data line 55 of the cord 50, is sent to the side of the hand operation unit 30B, is fed to the power supply line 36 with the capacitor C is charged via the reverse blocking diode D ₁ as a forward biased You. Therefore, the voltage of the power supply line 36 is kept at V _DD . When the data output terminal D-OUT becomes the H level, Q ₃ is turned off, the transistor switching circuit 24 is disconnected from the key input line 54, all the keys if the released state, via a pull-up resistor R ₀ Key input line 54
Is maintained at V _DD .

The serial data on the data line 55 is input to the display controller 35 of the hand controller 30B, and the display controller 35 controls the LCD display 34 according to the data to display the music number and the elapsed playing time. 1
When the data output for the number of times has been completed, the system controller 12 of the main body 10B changes the track number of the sub-code input from the CD reproducing unit 11 or the second data of the elapsed playing time is one.
Stop data output until it changes by the amount of seconds, data output terminal D-OU
Keep T at H level. Therefore, the driver circuit 22 outputs H
The level is output as a power source and sent to the hand controller 30B via the data line 55. When the song number of the subcode changes or the second data of the elapsed playing time changes by one second, the system controller 12 outputs the serial data again and updates the display of the song number and the playing elapsed time on the LCD display 34 (step). S50, S52 to S55). During data output, the key input line 54 and the data line 55 are alternately used to supply power to the hand controller 30B. Hereinafter, the same operation is repeated.

(4) Pause When the user presses the pause key 33 during playback, if the system controller 12 is not outputting data, the divided voltage V ₃ is input to the key input terminal K-IN. Therefore, the system controller 12 can use the pause key 3 without error.
It can be determined that 3 has been pressed. However, if the pause key 33 is pressed while the system controller 12 is outputting data, the transistor switch circuit 24 is turned on while the data output terminal D-OUT is at the L level. V _DD is input to -IN, and V ₃ is input only during the period when the data output terminal D-OUT is at the H level. Thus, the voltage repeatedly changes between V _DD and V ₃ (see (4) in FIG. 4). ). In this case, the system controller 12 erroneously determines that the PAUSE key 33 has been pressed many times.

In this embodiment, during data output, the system controller 12 outputs the input voltage V of the key input terminal K-IN.
_{By not} reading the _IN and determining which key was pressed, a malfunction is avoided (determination of YES in step S70 of FIG. 3). When the user presses the pause key 33 while data is not being output, a key input terminal
Since the K-IN is divided voltage V ₃ is input, the system controller 12 determines that the pause key 33 is pressed. Since the PLAY is currently being performed, pause control is performed on the CD reproducing unit 11 (NO in step S70, S71, S7
4-S76). Then, serial data indicating the music number of the pause portion and the elapsed playing time are output from the data output terminal D-OUT (YES in step S51 in FIG. 2, S56). The data is input to the display controller 35 of the hand controller 30B via the driver circuit 22 and the data line 55, and under the control of the display controller 35, the music number and the elapsed playing time of the pause portion are displayed on the LCD display 34. During data output, the key input line 54 and the data line 55 are used alternately, and the power supply to the hand controller 30B is continued.

After one second has elapsed, the system controller 12 outputs serial data for instructing to turn off the light, controls the display controller 35 to turn off the LCD display 34 (steps S57 and S58). Then, the serial number indicating the music number of the pause portion and the elapsed playing time are output again, and the LCD display 34 is controlled to display the music number and the elapsed playing time of the pause portion (steps S59, S60, S56). Hereinafter, the same operation is repeated.

(5) Pause release When the user presses the pause key 33 again while data is not being output, the system controller 12
Pause release control is performed on the D playback unit 11 to restart playback from the pause position (NO in step S70 of FIG. 3, S71, S74, S75, S77, S78). Then, every time the song number changes or the elapsed playing time changes by one second, serial data indicating the song number and the elapsed playing time is output and displayed on the LCD display 34 of the hand controller 30B (FIG. 2). Steps S50, S52 to S55).

(6) STOP After that, when data is not being output, the user
When pressing the TOP key 32, since the divided voltage V ₂ to the key input terminal K-IN is input, the system controller 12
Determines that the STOP key 32 has been pressed, and
1 is stopped, and data output is also stopped (NO in step S70 in FIG. 3, S71, S79, S
80). Then, since the data output terminal D-OUT keeps the H level, the driver circuit 22 outputs the H level and supplies it to the hand controller 30B as power.

According to this embodiment, when the system controller 12 of the main body 10B is not outputting data, the H level is supplied from the driver circuit 22 to the hand controller 30B via the data line 55 of the code 50 as the power supply voltage. outputs can be fed to the power supply line 36 via a first reverse blocking diode D _1. When the system controller 12 is outputting data, during the same period as when the logic level is not outputting data, the driver circuit 22 outputs the H level to the hand controller 30B as the power supply voltage, and the logic level is set to the data output. During the period opposite to the time when the power supply is not performed, the transistor switch circuit 24 is turned on, and the main power supply V _DD is connected to the key input line 54 of the cord 50, so that the power supply voltage is output to the hand controller 30B. it can be fed to the power supply line 36 via the reverse-blocking diode D _2. Since the driver circuit 22 has low output impedance and the transistor switch circuit 24 also has low internal impedance, the current consumption capacity of the hand controller 30B can be increased.

The data output from the system controller 12 is sent to the hand controller 30B via the driver circuit 22 and the data line 55, and is sent to the display controller 35.
Although inputted to, this time, the presence of the driver circuit 22 is first reverse blocking be output L diode D _1, the power supply of the hand operation unit 30B the data line 55 and the power supply line 36 is cut off Line 36 does not fall to zero. On the other hand, when the system controller 12 is not outputting data, the PLAY key 31, the STOP key 32,
Press any PAUSE key 33, it is possible to enter the corresponding divided voltage to the key input terminal K-IN of the system controller 12, this time, the presence of the second reverse-blocking diode D _2, the key input line Since the power supply line 54 and the power supply line 36 are cut off, the voltage of the power supply line 36 of the hand controller 30B does not decrease. Therefore, in addition to data transmission and key input using the data line 55 and the key input line 54 of the code 50, a power supply having a large allowable current can be supplied from the main body 10B to the hand controller 30B. It is possible to reduce the number of poles of the jack terminal 14 and the plug 57 to reduce the load on the configuration.

Further, since the system controller 12 treats the key signal input as invalid while the data is being output, it is possible to prevent a mistake in the key input and an unexpected control operation of the user. Further, by providing a charging capacitor between the power supply line 36 of the hand controller 30B and the ground, it is possible to stabilize the power supplied to each part of the hand controller 30B.
When data is output or a key operation is performed with the hand operation device 30B, the power supply of the hand operation device 30B instantaneously becomes low, which can prevent malfunction.

In the embodiment described above, the portable C
Although the D player has been described as an example, the present invention can be similarly applied to other types of devices such as a portable cassette tape recorder and a portable MD player. Also, the case where the controller of the hand controller performs display control based on data input from the main body has been described as an example, but another operation may be performed.

[0043]

According to the present invention, a power supply having a large allowable current can be supplied from the main body side to the hand controller by using the data line of the cord, the number of core wires of the cord can be reduced, and the jack terminal and the pole of the plug can be supplied. By reducing the number, the burden on the configuration can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a portable CD player according to one embodiment of the present invention.

FIG. 2 is a flowchart showing a control process of a system controller in FIG. 1;

FIG. 3 is a flowchart showing a control process of a system controller in FIG. 1;

FIG. 4 is a time chart showing voltages of respective parts of the portable CD player.

FIG. 5 is a circuit diagram of a conventional portable CD player.

FIG. 6 is a circuit diagram of another conventional portable CD player.

[Explanation of symbols]

10B Main unit 11 CD playback unit 12 System controller 13 Power supply unit 14 Jack terminal 22 Driver circuit 24 Transistor switch circuit 30B Hand controller 31 PLAY key 32 STOP key 33 PAUSE key 34 LCD display 35 Display controller 36 Power supply line 37 EL element 38 driver 50 code 54 key input line 55 data lines 57 plug R ₀ pull-up resistor R ₁ to R ₃ resistor R ₁₂ pull-down resistor

Claims (5)

[Claims] A hand-held operation device including one or more operation keys, an operation-side controller that inputs data and performs a predetermined operation, and a key signal input to perform a corresponding predetermined control operation.
It has a main unit including a main unit controller that outputs predetermined data according to the operation state, a key input line, a data line, and an earth line.
It consists of a hand controller and a code that interconnects the main unit.The main unit connects the key input terminal of the main unit controller to the key input line of the cord, and also connects to the power supply via a pull-up resistor. The data output terminal is connected to the data line of the code via the driver circuit. In the hand controller, a combination circuit of one or more operation keys and one or more resistors for voltage division is connected between the key input line of the code and the ground. When a certain operation key is pressed, a corresponding predetermined divided voltage is input as a key signal to a key input terminal of the main controller, and a data input terminal of the operation controller is connected to a data line of a code. And a power supply line and a data line of the cord are connected via a reverse blocking diode. Remote control devices. 2. The remote control device according to claim 1, wherein a charging capacitor is provided between a power supply line of the hand controller and a ground. 3. A hand-held operation device including one or a plurality of operation keys, an operation-side controller that inputs data and performs a predetermined operation, and inputs a key signal to perform a corresponding predetermined control operation.
It has a main unit including a main unit controller that outputs predetermined data according to the operation state, a key input line, a data line, and an earth line.
It consists of a hand controller and a code that interconnects the main unit.The main unit connects the key input terminal of the main unit controller to the key input line of the cord, and also connects to the power supply via a pull-up resistor. The data output terminal is connected to the data line of the code via a driver circuit, and the driver circuit outputs a high level when the main body side controller is not outputting data, and furthermore, a power supply and a key input line of the code. A switch circuit is provided between the logic circuit and the logic circuit according to the data output from the data output terminal of the main body controller, when the output of the driver circuit is at the logic level of H, the switch circuit is turned off, and the output of the driver circuit becomes L. When the level is set, the switch circuit is turned on. In the local operation device, one or more operation keys and one or more Connects a combination circuit with a plurality of voltage dividing resistors between the key input line of the cord and the ground, and when a certain operation key is pressed, the corresponding predetermined divided voltage is inputted as a key signal by a key input of the main body controller. The data input terminal of the operation side controller is connected to the data line of the cord, and the power supply line and the data line of the cord are connected via the first reverse blocking diode. A key input line of the cord is connected via a second reverse blocking diode. 4. The remote control device according to claim 3, wherein the main body controller ignores a key signal input while outputting data. 5. The remote control device according to claim 3, wherein a charging capacitor is provided between a power supply line of the hand controller and the ground.