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Function-oriented Knowledge Base \ Optical Mouse Cord

Radio wave signals transmit cursor control signals to computer

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A conventional computer mouse is typically connected to a computer via a connection cord. A problem arising from the use of a corded mouse is that the cord often gets in the way, which is annoying. Furthermore, it can be broken or operate in an irregular manner. Because the cord is an indispensable element, the mouse is limited in its operational area. A method of providing a mouse or other pointing device without a corded connection to the computer is needed.
To transmit cursor control signals to the computer, the use of radio-wave signals is proposed. Transmitter circuitry installed in a computer mouse contains a transmitting antenna. The host computer is fitted with a receiver that has a receiving antenna. When the user's hand moves the mouse, the transmitter circuitry generates narrow band, low power radio-wave signals. The radio-wave signals contain four position signals that correspond to the movement of the mouse in four orthogonally related directions. A demodulator converts the received radio wave signals into analog mouse data signals. A mouse data decoder converts analog mouse data signals into digital mouse data, which are sent to the input port of the host computer. Thus, radio-wave signals transmit cursor control signals to the computer without a corded connection.
Additional information
The bandwidth of the radio-wave signal is approximately 10 to 20 KHz. The maximal power of the radio-wave signal amounts to approximately 1 mW. The maximal usable range of the mouse from the host computer amounts to approximately 5 meters. As a result, the radio-wave signal emitted by the mouse does not interfere with the operation of other electronic equipment in the vicinity.
US Patent 4754268; Link >>
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