JP2001306228A - Data inputting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the power consumption of a data inputting device equipped with a cable transmitting means and wire-less transmitting means. SOLUTION: A cable connection detecting circuit 32 detects whether or not a cable 41 is connected to a cable connector 31. A power source control circuit 13 interrupts power supply to a modulating circuit 21, an amplifier circuit 22, and a transmitting and receiving circuit 23 at the time of receiving a signal indicating that the cable is connected from the cable connection detecting circuit 32. At that time, a power is supplied to a protocol converting circuit 33. On the contrary, the power source control circuit 13 interrupts power supply to the protocol converting circuit 33 at the time of receiving a signal indicating that the cable is not connected. At that time, a power is supplied to the modulating circuit 21, the amplifier circuit 22, and the transmitting and receiving circuit 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data input device having both cable transmitting means and wireless transmitting means.

[0002]

2. Description of the Related Art A keyboard is generally used as an input means (data input device) of an information processing apparatus. At present, a keyboard is generally connected to the apparatus main body by using a cable, but a wireless keyboard has been invented because it is inconvenient to route the cable. When wireless, you need power on the keyboard side,
Therefore, a battery is generally used in many cases.
However, when a battery is used, the driving time is limited, so a mechanism for suppressing power consumption is desired. JP-A-11-
No. 53090 discloses a keyboard as a data input device having both a cable transmitting unit and a wireless transmitting unit. According to this publication, the keyboard includes a power supply that drives each component in the keyboard, a transmitting unit that converts a key input signal into a signal using the air as a propagation medium and transmits the signal, a signal line of the key input signal, A first connector for connecting the power supply potential signal line and the ground potential signal line to the outside.

However, the data input device disclosed in Japanese Patent Application Laid-Open No. H11-53090 has the following problem. That is, the data input device disclosed in Japanese Patent Laid-Open No. 11-53090 has both a cable transmitting unit and a wireless transmitting unit. However, the battery provided in the keyboard can be used for both cable transmission and wireless transmission. , Power is supplied to both the cable transmitting means and the wireless transmitting means. In that case, there is a problem that power is consumed by a circuit that does not need to be operated, and power consumption is unnecessarily increased.

[0003] The present invention has been made in view of the above-mentioned problems in the prior art, and has as its object to reduce the power consumption of a data input device having both a cable transmitting unit and a wireless transmitting unit.

[0004]

Means for Solving the Problems The first invention of the present application, which solves the above problems, comprises a circuit required for cable transmission, a circuit required for wireless transmission, a cable for data transmission and power supply connection, Battery and when connecting the cable,
While shutting off the supply of power to the circuit necessary for the wireless transmission, charging the secondary battery with a power supply connected by the cable, and when the cable is disconnected, the power supply to the circuit required for the cable transmission is turned off. A data input device characterized by interrupting supply.

[0005] When data transmission is performed by cable connection, it is not necessary to operate a circuit necessary for wireless transmission. However, according to the data input device of the first invention of the present application, when data transmission is performed by cable connection. Cuts off the supply of power to circuits required for wireless transmission, so that unnecessary power is not consumed. Conversely, when data is transmitted wirelessly, it is not necessary to operate a circuit required for cable transmission. However, according to the data input device of the first invention of the present application, when data is transmitted wirelessly, the cable is not transmitted. Since supply of power to a circuit necessary for transmission is cut off, unnecessary power is not consumed. Further, when the cable is connected, the secondary battery is charged by the power supplied from the cable, so that the charging operation can be performed efficiently. As a result, there is an advantage that it is possible to reduce the power consumption of the data input device having both the cable transmission unit and the wireless transmission unit.

Further, the second invention of the present application relates to a circuit required for cable transmission, a circuit required for wireless transmission, a cable for data transmission and power connection, a secondary battery, and the presence or absence of connection of the cable. A data input device comprising a cable connection detection circuit for detecting, and a power supply control circuit for controlling supply of power from the secondary battery to a circuit necessary for the cable transmission and a circuit required for wireless transmission according to the presence or absence of the cable connection detection circuit. .

Therefore, according to the data input device of the second aspect of the present invention, the presence or absence of cable connection is detected by the cable connection detection circuit, and a signal indicating the presence or absence of the cable connection is sent to the power supply control circuit. When receiving a signal, the supply of power to the circuit necessary for the wireless transmission is cut off, and power is supplied to the circuit required for the cable transmission. By shutting off power supply to necessary circuits and supplying power to circuits necessary for the wireless transmission, power is not consumed by circuits that do not need to be operated, and when a cable is connected, The secondary battery can be charged by a power supply supplied from a cable. As a result, there is an advantage that it is possible to reduce the power consumption of the data input device having both the cable transmission unit and the wireless transmission unit.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A data input device according to an embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

FIG. 1 is a block diagram showing a data input device and an information input device according to an embodiment of the present invention. The data input device of the present embodiment is an example applied to a keyboard. As shown in FIG. 1, a keyboard 1 as a data input device sends data to an information processing device 51. The keyboard 1 has two types of means for transmitting data: a wireless transmitting means for transmitting via the antenna 24 and a cable transmitting means for transmitting through the cable 41. In the present embodiment, the antenna 24 is used as the wireless transmission means. However, the present invention is not limited to this, and the wireless transmission means may use communication means such as infrared rays.

The keyboard 1 contains a battery 11 as a power source, and can be charged by a charging circuit 12. Since the battery 41 needs to be connected to an external power supply for charging, the cable 41 connects the keyboard 1 and the information processing device 51 to exchange data, and supplies power from the information processing device 51 to the charging circuit 12 of the battery 11. Have the ability to

Hereinafter, the overall operation of the embodiment shown in FIG. 1 will be described. The input operation with the cable 41 connected to the cable connector 31 is as follows. That is, when the cable 41 is connected to the cable connector 31 and data is transmitted through the cable 41, first, the key matrix 3
Press 4. Then, data indicating the pressed key is sent to the protocol conversion circuit 33. Protocol conversion circuit 33
Is converted into a data format to be sent to the information processing device 51, and the converted data reaches the cable connector 31 via the cable connection detection circuit 32 and is sent to the information processing device 51 via the cable 41. On the other hand, the input operation when the cable 41 is not connected to the cable connector 31 is as follows. That is, the cable 41 is connected to the cable connector 31.
When the connection is not made, the data indicating the pressed key is modulated by the modulation circuit 21 and transmitted to the transmission / reception circuit 23 via the amplification circuit 22, and the data is transmitted from the antenna 24 to the information processing device 51.

Next, a mechanism for reducing power consumption according to this embodiment will be described. Power is supplied from the battery 11 to the modulation circuit 21, the amplification circuit 22, the transmission / reception circuit 23, and the protocol conversion circuit 33 via the power supply control circuit 13. The power supply control circuit 13 includes a modulation circuit 21, an amplification circuit 22, a transmission / reception circuit 23, and a protocol conversion circuit 33 from the battery 11.
Controls supply and cutoff of power supplied to the system. The cable connection detection circuit 32 connects the cable 4 to the cable connector 31.
1 is connected or not. When receiving the signal indicating the presence of the cable connection from the cable connection detection circuit 32, the power supply control circuit 13 cuts off the power supply to the modulation circuit 21, the amplification circuit 22, and the transmission / reception circuit 23. At this time, power is supplied to the protocol conversion circuit 33.
Conversely, when a signal indicating no connection is received, power supply to the protocol conversion circuit 33 is cut off. At this time, power is supplied to the modulation circuit 21, the amplification circuit 22, and the transmission / reception circuit 23. When a cable is connected, the modulation circuit 21
The amplifier circuit 22 and the transmission / reception circuit 23 do not need to operate.
When no cable is connected, the protocol conversion circuit 33 does not need to operate. Therefore, according to the above embodiment, by detecting the cable connection and performing power cutoff to a circuit unnecessary for operation, the battery 11
Consumption can be reduced.

[0013]

As described above, according to the present invention, when data transmission is performed by cable connection, the power supply of a circuit necessary for wireless transmission is cut off, and the battery is further charged. When transmitting data wirelessly, the power supply of a circuit required for cable transmission is shut off. The present invention has the effect of reducing power consumption of the data input device and reducing battery consumption by performing power control for each circuit in this manner.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a data input device according to an embodiment of the present invention and an information input device connected thereto;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Keyboard 11 ... Battery 12 ... Charge circuit 13 ... Power supply control circuit 21 ... Modulation circuit 22 ... Amplification circuit 23 ... Transmission / reception circuit 24 ... Antenna 31 ... Cable connector 32 ... Cable connection detection circuit 33 ... Protocol conversion circuit 34 ... Key matrix 41 ... cable 51 ... information processing device

Claims (2)

[Claims] 1. A circuit required for cable transmission, a circuit required for wireless transmission, a cable for data transmission and power supply connection, and a secondary battery, and a circuit required for wireless transmission when the cable is connected. While shutting off the supply of power to the, the secondary battery is charged by the power supply connected by the cable, when the cable is not connected,
A data input device for shutting off power supply to a circuit required for the cable transmission. 2. A circuit required for cable transmission, a circuit required for wireless transmission, a cable for data transmission and power supply connection, a secondary battery, and a cable connection detection circuit for detecting whether or not the cable is connected. A data input device comprising: a power supply control circuit that controls supply of power from the secondary battery to a circuit required for the cable transmission and a circuit required for wireless transmission according to the presence or absence of the power supply control circuit.