JPH02304611A - Wireless keyboard - Google Patents

Abstract

PURPOSE:To obtain such a wireless keyboard as data is not received erroneously by a terminal equipment being not a target but received by a target terminal equipment by adding a identification code of a terminal equipment to be trans mitted, to transmitting data and transmitting it. CONSTITUTION:In the case it is desired to send out data to a personal computer 13, the personal computer 13 is selected by a terminal equipment selecting switch 33 of a wireless keyboard 19. Information for showing a fact that the computer 13 is selected by the terminal equipment selecting switch 33 is stored in a RAM which is not shown in the figure. Whenever a key of a key matrix 35 is depressed, a key code 41 corresponding to the depressed key is outputted. A CPU 37 reads out a identification code 43 of the computer 13 selected previ ously from the RAM which is not shown in the figure. The CPU 37 adds the read-out identification code 43 to the head of the key code outputted by the key matrix 35 and supplies it to an infrared-ray transmitting part 29. The trans mitting part 29 executes the modulation of the code 43 and the key code 41, and transmits infrared rays. The transmitted infrared rays are received by each personal computer 11, 13, 15 and 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a wireless keyboard used in a decoding terminal device.

[Conventional technology]

A compound terminal device is one that allows a wide variety of input/output devices to be selected and connected depending on the purpose of use, and allows a system to be configured relatively freely. Composite terminal devices enable local processing of data on the terminal device side, which is equipped with a large-capacity memory and auxiliary storage device, and can reduce the load on the host computer.

In such a multifunction terminal device, the human power of each terminal device may be performed wirelessly by transmitting a wireless signal such as infrared rays from a wireless keyboard. The wireless keyboard is equipped with an infrared transmitter that emits infrared light corresponding to the pressed key, and instructs each terminal device to perform manual labor and data processing. On the other hand, each terminal device includes an infrared receiving section and receives infrared rays emitted from the wireless keyboard. Each terminal device checks whether the received signal matches the code system and bit structure of its own terminal, and if they match, processes the received signal accordingly. For example, when a wireless keyboard sends out infrared rays instructing print processing, only the printer receives this signal as valid and processes it.

[Problem to be solved by the invention]

In this way, conventional wireless keyboards transmit only the key code corresponding to the pressed key, but there is little risk of malfunction between terminal devices of different types.

However, there are cases where a plurality of microcomputers or personal computers of the same type are arranged as terminal devices.

In such a case, the signal transmitted from the wireless keyboard will be received by all of these terminal devices of the same type as valid signals that match their own terminals.

That is, with the conventional wireless keyboard, when a plurality of terminal devices of the same type are arranged, it is not possible to distinguish between these terminal devices.

Therefore, it is not possible to specify one terminal device among the same type of terminal devices and send data from the wireless keyboard, which has the disadvantage that other terminal devices receive the data incorrectly.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide a wireless keyboard that allows created data to be received by a desired terminal device without being erroneously received by an unnecessary terminal device.

[Means to solve the problem]

The wireless keyboard of the present invention includes (i) a key matrix that outputs a key code corresponding to a pressed key;
(ii) a terminal device selection switch disposed corresponding to the terminal device on the receiving side of the key code; and (iii) identification code output means for outputting an identification code indicating the terminal device selected by the terminal device selection switch. , (iv) code information synthesis means for synthesizing the identification code output from the identification code output means and the key code output from the key matrix, and (V) wireless communication of the code information synthesized by the code information synthesis means. and a wireless signal output means for outputting as a signal.

That is, in the wireless keyboard of the present invention, the identification code of the terminal device to be transmitted is added to the data to be transmitted.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 2 shows the system configuration of a multifunction terminal device configured using a wireless keyboard according to an embodiment of the present invention.

The compound terminal device is a personal computer 11 of the same type.
13, 15, 17J3, and a wireless keyboard 19 that transmits predetermined infrared signals to these terminal devices. Personal computer 11S 13.15
．． 17 are infrared receiving units 21 and 23 that each receive infrared rays.
．． 25.27, wireless keyboard 19
The infrared signal transmitted from the infrared transmitting section 29 is received.

, FIG. 1 shows the configuration of a wireless keyboard used in such a composite terminal device.

The wireless keyboard 19 includes terminal device selection switches 33 arranged corresponding to the plurality of personal computers 11, 13, 15, and 17. An identification code corresponding to this terminal device selection switch 33 is stored in a predetermined area of a random access memory (RAM), not shown.

The pressed key on the wireless keyboard 19! It is equipped with a key matrix 35 that outputs a key code in response to the request. The CPU (central processing unit) 37 adds an identification code to the key code output from the key matrix 35 and supplies the key code to the infrared transmission section 29 . The infrared transmitter 29 is configured to transmit the supplied signal as an infrared signal.

FIG. 3 shows the contents of the infrared signal transmitted from the wireless keyboard 19 to each personal computer 1113.15.17.

The contents of the infrared signal are composed of a key code 41 of the personal computer selected by the IJ box 35 and an identification code 43 of the terminal device selected by the terminal device selection switch 33.

Next! Now, the operation of transmitting such an infrared signal from the wireless keyboard 19 will be explained.

The infrared signals sent from the infrared transmitter 29 of the wireless keyboard 19 shown in FIG. 2 are now in a state where each personal computer 11, 13, 15, and 17 can receive them. In such a state, if it is desired to send data to a predetermined personal computer 13, for example, the personal computer 13 is selected using the terminal device selection switch 33 shown in FIG. Information indicating that the personal computer 13 has been selected by the terminal device selection switch 33 is stored in a RAM (not shown).

Each time a key in the key matrix 35 is pressed, a key code 41 corresponding to the pressed key is output. When the key code 41 is output, the CPU 37 reads out the identification code 41 of the previously selected personal computer 13 from a RAM (not shown). The CPtJ 37 adds the read identification code 43 to the beginning of the key code output by the key matrix 35 and supplies it to the infrared transmitter 29 .

The infrared transmitter 29 modulates the identification code 43 and key code 41 supplied from the CPU 37, and transmits the modulated infrared rays. The infrared rays emitted from the infrared transmitter 29 are transmitted to each personal computer 11. ．． 13.15.17 received.

FIG. 4 shows each personal computer 11, 13, 15.
17 is shown.

The infrared signal transmitted from the infrared transmitting section 29 of the wireless keyboard 19 is received by the infrared receiving section 51. The infrared receiving section 51 demodulates the received infrared signal into the original key code 41 and identification code 43 and supplies them to the serial interface 53.

The serial interface 53 transfers the supplied signal to the signal separation section 55 bit by bit. The signal separation unit 55 separates the transferred signal into a key code 41 and an identification code 43, and checks whether the identification code 43 is a signal indicating the own terminal. The identification code 430m is recognized by the CPU 3'7 by comparing the identification code 43 transferred from the serial interface 53 with the code that identifies the own terminal written in a storage area (not shown).

When the identification code 43 indicates the own terminal, the code separation unit 55 selects the key ':]-1'4 from the separated code.
1 to B I OS (Basic Ilo System)
m>57. The key code 41 supplied to the BIO 557 is supplied to the key state table 59 if it is a special code such as a stop command, and is supplied to the key data buffer 61 if it is not a special code. The key code 41 supplied to the key status table 59 and key data buffer 61 can be taken out by the BIO 363 when necessary.

On the other hand, if the identification code 43 does not indicate the own terminal, the code separation unit 55 transfers the separated key code 41 to the BIO
Do not supply to 557. As a result, the code 41 output from the wireless keyboard 19 is manually input only to the predetermined personal computer 13 selected by the terminal device selection switch 33, and not to other personal computers 11, 15, 17. becomes.

In the embodiment described below, the wireless keyboard outputs infrared rays, but the present invention is not limited to this, and for example, ultrasonic waves or radio waves may be used.

Furthermore, in the embodiments described above, the determination as to whether or not the identification board received by the personal computer indicates its own terminal device is made by comparing the CPU with an identification code stored in a RAM (not shown), but the logic circuit This may be done by hardware, or it may be done by software, using a BIO5 program.

〔Effect of the invention〕

As described above, according to the present invention, the identification code of the terminal device to be transmitted is added to the data to be transmitted before transmission, so that the manually inputted data is not erroneously received by an unnecessary terminal device. It is possible to provide a wireless keyboard that can be received by a predetermined target terminal device.

[Brief explanation of drawings]

Figures 1 to 4 are for explaining one embodiment of the present invention, of which Figure 1 is a configuration diagram showing the configuration of a wireless keyboard, and Figure 2 is a configuration diagram showing the configuration of a wireless keyboard. Figure 3 shows the system configuration of the device, from the wireless keyboard to each personal computer!
FIG. 4 is a circuit diagram showing a part of the circuit of a personal computer. 19...Wireless keyboard, 29...
・Infrared transmitter,

Claims (1)

[Claims] A key matrix that outputs a key code corresponding to a pressed key; a terminal device selection switch disposed corresponding to a terminal device on the receiving side of the key code; and a terminal device selection switch that outputs a key code corresponding to a pressed key; identification code output means for outputting an identification code indicative of the terminal device that has been accessed; code information synthesis means for synthesizing the identification code output from the identification code output means and the key code output from the key matrix; A wireless keyboard comprising: wireless signal output means for outputting code information synthesized by the information synthesis means as a wireless signal.