Function-oriented Knowledge Base \ Optical Mouse Cord
Radio wave signals transmit cursor control signals to computer
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Introduction 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.
Description 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.
