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Function-oriented Knowledge Base \ Optical Mouse Cord

Modulated light pulses transmit cursor control signals to computer

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A conventional computer mouse is typically connected to a computer via a connection cord. As a result, the cord of the corded mouse often gets in the way, which is annoying. Furthermore, it can be broken or operate unstably. Because the cord is a necessary element, the operational area of the mouse is limited. A method of providing a mouse or other pointing device without a corded connection to the computer is needed.
To transmit a cursor control signal to the computer, the use of modulated light pulses is proposed. The base of the computer has two light sources embedded into it that emit broad-spectrum white light over a wide, fan-shaped horizontal angle. The white light penetrates the mouse through optical windows. The optics of the mouse then split the white light into red, green, yellow, blue and cyan light. The green and red light pass through openings in an initial chopper wheel and are reflected from an initial retroreflector. The yellow and blue light pass through openings in a second chopper wheel and are reflected from a second retroreflector. When the user's hand moves the mouse forward and backward, the rotation of the ball causes rotation of the initial chopper wheel. As a result, a series of pulses of red and green light is produced. When the user moves the mouse in the right/left direction, a series of pulses of yellow and blue light is produced. The movement of the mouse in a random direction leads to the generation of a unique series of light pulses composed of the described colors. These light pulses are emitted through the optical windows of the mouse. They then reach a detecting means installed on the computer. The detecting means (in conjunction with electronics) converts the light pulses into corresponding cursor control signals. The cursor control signals are sent to the conventional input port of the host computer. Thus, modulated light pulses transmit a cursor control signal to the computer without a corded connection.
Additional information
Cyan light is used to generate one light pulse when the user presses a mouse button. The proposed mouse does not contain any electronics or power sources.
US Patent 6111563; Link >>
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