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Input system and input device

Inactive Publication Date: 2008-11-27
FUJITSU TAKAMIZAWA COMPONENT LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]According to the above-described input system, since the signals generated by having the carrier frequencies modulated with the input information are transmitted, a received signal level can be raised even if each carrier frequency has weak electric field strength.
[0012]According to the above-described input system, space diversity effect can be obtained by outputting the same data of the same carrier frequency from the wave direction parts. Therefore, an efficient signal transmission can be performed irrespective of an input device state.
[0014]According to the above-described input device, since the signals generated by having the carrier frequencies modulated with the input information are transmitted, a received signal level can be raised even if each carrier frequency has weak electric field strength.
[0016]According to the above-described input device, space diversity effect can be obtained by outputting the same data of the same carrier frequency from the wave direction parts. Therefore, an efficient signal transmission can be performed irrespective of an input device state.

Problems solved by technology

However, legal restrictions on radio waves restrict transmission power in radio communication employing the RF electromagnetic waves, which makes a communicable distance of the RF radio communication insufficient.
Further, the legal restrictions prevent sufficient electric field strength to receive radio waves from being obtained.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0039]FIG. 1 is a block diagram of an input system 1 according to the present invention.

[0040]The input system 1 is applied as an input system for a computer. The input system 1 includes an input device 11 and a reception circuit 12. Information input from the input device 11 is supplied via two radio communication paths to the reception circuit 12. The reception circuit 12 supplies the information from the input device 11 to the computer.

[0041]The input device 11 is a mouse and includes a coordinate detection ball 21, sensors 22 and 23, switches 24 and 25, a microprogram control unit (MCU) 26, first and second transmission circuits 27 and 28, first and second antennas 29 and 30, and a power supply 31.

[0042]Each of the sensors 22 and 23 includes a rotary encoder and generates pulses whose number corresponds to a rotational displacement amount of the coordinate detection ball 21. The detection results of each of the sensors 22 and 23 are supplied to the MCU 26. The MCU 26 computes di...

second embodiment

[0066]FIG. 7 is a block diagram of an input system 100 according to the present invention. In FIG. 7, the same elements as those of FIG. 1 are referred to by the same numerals, and a description thereof will be omitted.

[0067]The input system 100 differs from the input system 1 of FIG. 1 in a reception circuit structure. A reception circuit 110 of this embodiment includes first and second reception parts 111 and 112 for receiving the radio waves of the first and second carrier frequencies f1 and f2 transmitted from the first and second antennas 29 and 30, respectively, and a synthesis part 113 that synthesizes first and second received signals from the first and second reception parts 111 and 112, respectively.

[0068]According to this embodiment, the radio waves of the first and second carrier frequencies, f1 and f2 are individually received and then synthesized. Therefore, the radio waves are efficiently received and demodulated, so that received signal levels can be raised.

[0069]Acc...

third embodiment

[0070]FIG. 8 is a block diagram of an input system 200 according to the present invention. In FIG. 8, the same elements as those of FIG. 1 are referred to by the same numerals, and a description thereof will be omitted.

[0071]The input system 200 differs from the input system 1 of FIG. 1 in an input device structure. An input device 210 of this embodiment includes a transmission circuit 211 and a switching circuit 212 instead of the first and second transmission circuits 27 and 28 of the input device 11 of FIG. 1.

[0072]A switching control signal Sc supplied from the MCU 26 allows the transmission circuit 211 to transmit a signal alternately to the first and second antennas 29 and 30. By thus outputting the same data of the same carrier frequency alternately from the first and second antennas 29 and 30, a space diversity effect can be produced. Therefore, a signal can be efficiently transmitted irrespective of a state of the input device 210.

[0073]FIG. 9 is a block diagram of the tran...

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Abstract

An input system includes an information generation part which generates input information based on a given input operation, a transmission part which transmits signal generated by having a plurality of different carrier frequencies modulated with the input information, and a reception part which receives the transmitted signals and demodulates the signals into input information.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a continuation of Ser. No. 09 / 838,170 filed Apr. 20, 2001 now pending, the disclosures of which is incorporated herein by reference. This application also claims the benefit of Japanese Application 2000-346994 filed on Nov. 14, 2000, whose priority is claimed under 35 U.S.C. §119, the disclosure of which is incorporated herein by reference.BACKGROUND[0002]1. Field[0003]The embodiments discussed herein are directed to input systems and input devices, and more particularly to an input system in which information input by radio communication is transmitted and an input device that transmits information input by radio communication.[0004]2. Description of the Related Art[0005]Recently, there has been a demand for wireless HIDs (Human Interface Devices) to improve the operability of computers. Radio communication methods employing infrared (Ir) lights or radio frequency (RF) electromagnetic waves have been conventionally employed in th...

Claims

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Application Information

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IPC IPC(8): G06F3/033G06F3/02G06F3/038G09G5/00H04B7/02H04B7/06H04B7/08H04B7/12
CPCG06F3/038
Inventor KURASHIMA, SHIGEMIYANAGI, MASAHIROENDO, MASAYASASAKI, SHINOBUENDO, NORIO
Owner FUJITSU TAKAMIZAWA COMPONENT LTD
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