JPH0374080B2 - - Google Patents

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a wired remote control device used, for example, in a video disc player or a television receiver.

TECHNICAL BACKGROUND OF THE INVENTION Electronic devices, such as video disc players, are sometimes provided with a wired remote control device so that the functions of the device can be controlled from the outside. This type of remote control device has a device body 1 as shown in Fig. 1.
Cable 13 with 7 cores between the 1 side and the hand controller 12 side
connected by. The hand controller 12 includes
A key switch section 12A is provided.

The main body 11 of the device is provided with a key switch portion 11A that is exactly the same as the hand controller 12, so that even if the hand controller 12 is separated, the device main body 11 can be operated. On the device main body 11 side, when the key switch section 11A or 12A is operated, the microcomputer 11B decodes the operation contents and switches the function of the device main body 11.

The relationship between the handheld operating device 12 and the key switch sections 12B and 11A on the device main body 11 side is shown in more detail in FIG. _K1 to _K6 are key switches, and _J1 to _J6 are signal lines. Signal lines J ₁ , J ₂
A key scan pulse is added to , which corresponds to a read synchronization pulse from the microcomputer 11B. Now, if key switch _K1 is turned on, the signal line _J5 will be connected as shown in Figure 3.
The signal _P4 from the signal line _J1 is output. Further, when the key switch _K2 is turned on, the signal _P5 from the signal line _J2 is output to _the signal line J5. Also, when key switch K ₃ is turned on, signal line J ₁ is connected to signal line J ₄ .
When signal P ₂ from signal line J 2 is output and key switch K ₄ is turned on, signal P ₃ from signal line J ₂ is output to signal line J ₄ .
is output. Furthermore, when the key switch _K5 is turned on, the signal _P1 from the signal line _J1 is output to the signal line _J3 . The key switch _K6 is independent, and when turned on, the signal _P6 appears on the signal line _J6 . FIG. 3 shows the operating waveforms of each of the above signals, and the microcomputer 11B determines which key switch is turned on based on the relationship between the key scan pulses S ₁ and S ₂ , the signal lines, and the signal timing. can do. The above key switches K ₁ to _{K 6} are those on the device main body 11 side, but completely similar key switches k ₁ to k ₆ are provided on the hand controller 12 side, and each signal line J ₁ to
J ₆ is connected in the same way as the previous key switches K ₁ to K ₆ . Therefore, when the keyswitches _k1 to _k6 on the hand controller 12 are operated, the previous keyswitches
Exactly the same control as K ₁ to K ₆ can be performed.

Problems with the Background Art As described above, according to the conventional wired remote control device, seven signal lines J ₁ to J ₇ are required to connect the device main body 11 and the hand controller 12. In order to connect the connector 15 to the transmitter side, a total of 14 locations must be soldered, which is not only difficult to work with but also poses a risk of erroneous wiring. Another problem is that the cable itself becomes thicker and the transmitter has to be larger.

OBJECTS OF THE INVENTION The present invention has been made to address the above-mentioned circumstances, and an object of the present invention is to provide a wired remote control device that can reduce the number of connection lines between the device main body side and the handheld controller side.

Summary of the Invention This invention provides a line for supplying key scan pulses from the device main body side to the hand controller side, and also provides a line for supplying power supply voltage to a ladder resistor on the hand controller side, and supplies this power supply voltage. In response to the operation of a key switch on the hand controller side, a divided voltage is generated and fed back to the line, and multiple comparators are made to sense this voltage.

Embodiments of the Invention Examples of the invention will be described below with reference to the drawings. FIG. 4 shows an embodiment of this invention, in which K ₁ ~
K ₆ is a key switch on the device main body 11 side, and J ₁
~ _J6 is the signal line. The connections between both terminals of the key switches _K1 to _K6 and the signal lines _J1 to _J6 are the same as in FIG. 2 above. Key scan pulses are output to signal lines J _{1 and} J ₂ , which are connected to the bases of transistors Q ₁ and _{Q 2 via} resistors 21 and 22, respectively. Furthermore, signal lines J ₃ , J ₄ , J ₅
are connected to the output terminals of comparators 23, 24, and 25 through diodes D ₁ , D ₂ , and D ₃ in opposite directions, respectively. Further, one side of the key switch _K6 is connected, and the other side is connected to the second output terminal of the comparator 23. The power supply voltage (+V) is connected to the comparators 23, 24, and 25, respectively, by the ladder resistor 26,
A reference voltage divided by 27 is applied. In this case, two types of reference voltages with different levels are applied to one comparator at the ladder resistors 26 and 2.
It is given by 7.

The collectors of the transistors Q ₁ and Q ₂ described above are connected to the ladder resistors 31 and 32 on the hand controller 12 side via the connector 30, and the power supply voltage (+
V) is also connected to one terminal of each of the key switches _k1 to _k6 via a resistor Ra and then a connector 30. The other terminal of each key switch k ₁ , k ₃ , k ₅ is connected to each voltage division point of the ladder resistor 31 (resistance positions with different values).
The other terminals of the key switches k ₂ , k ₄ , and k ₆ are also connected to each voltage dividing point of the ladder resistor 32, respectively.

The operation of the wired remote control device configured as described above is as follows. Now, suppose you turn on key switch _k1 . When this key switch _k1 is turned on, the transistor _Q1 is turned on when the key scan pulse _S1 appears on the signal line _J1 . Further, at this time, a current due to the power supply voltage V ₁ flows through the resistor Ra, the key switch k ₁ , a part of the ladder resistor 31, and the connection 30a of the connector 30 to the emitter of the transistor Q ₁ . In the system at this time, the divided voltage generated at the terminal of the resistor Ra is detected by the comparator 25. That is, the comparator 25 is set so that the divided voltage generated when the key switch _k1 is turned on has a value between the reference voltages. other key switches
Similarly, when k ₃ , k ₅ and key switches k ₂ , k ₄ , k ₆ are operated, transistor Q ₁ or Q ₂ is turned on by key scan pulse S ₁ or S ₂ . Then, a divided voltage appears at the terminal of the resistor Ra depending on the connection point of each key switch, and is detected by one of the comparators 23, 24, and 25.
Detection signals as shown in FIG. 5 are obtained on each signal line _J3 to _J6 . Signal P ₁ corresponds to key switch k ₅ , signals P ₂ and P ₃ correspond to key switches k ₃ and k ₄ , and signals
P ₄ and P ₅ correspond to key switches k ₁ and k ₂ .

Effects of the Invention According to the invention described above, the number of cables connecting the device main body side and the hand controller side can be very small. Comparing the configurations in FIGS. 2 and 4, it can be seen that the number of wires has been reduced from seven to three. This improves the workability of wired cable connection and is extremely effective in preventing incorrect wiring. Furthermore, the thickness of the cable is also reduced, making it possible to downsize the transmitting side (handheld controller).

[Brief explanation of drawings]

Fig. 1 is a configuration explanatory diagram showing an overview of a wired remote control device, Fig. 2 is a configuration explanatory diagram showing a connection state of a conventional wired remote control device, and Figs. 3 a to f are operating waveforms of the circuit in Fig. 2. 4 are configuration explanatory diagrams showing one embodiment of the present invention, and FIGS. 5 a to 5 f are operational waveform diagrams of the circuit shown in FIG. 4. 11...Equipment body, 12...Hand control device, 2
3, 24, 25... comparator, 26, 27,
31, 32...Ladder resistor, 30...Connector,
Q ₁ , Q ₂ ...transistor, Ra ...resistance, K ₁ ...
K ₆ , k ₁ to _{k 6} ... key switch.

Claims (1)

[Claims] 1 A line that outputs the key scan pulse from the device main body side, a line that outputs the power supply voltage from the device main body side via a resistor for outputting the divided voltage, and a line provided on the hand controller side that outputs the power supply voltage. a plurality of key switches each having a line commonly connected to one terminal thereof, the other terminal of the plurality of key switches each being connected to a different resistance position, and a line for outputting the key scan pulse being connected in series to one end. a plurality of comparators to which terminals of the resistor provided on the main body of the device are respectively connected, and different reference voltages are set for each of the plurality of comparators. A wired remote control device characterized by comprising means.