Patent ID: 6313825
Filing Date: 2001-11-06
Classification: G06F

Abstract:
An input device for a computer comprising:a transmitter for producing energy;a first directional receiver for receiving reflected energy from at least one selected field in space defining a volume having an adjustable boundary;a second directional receiver for receiving reflected energy from said at least one selected field in space;a clock for determining the difference in time between producing a first amount of energy from the transmitter and receiving the first reflected energy from the transmitter at the first directional receiver and receiving the first reflected energy from the transmitter at the second directional receiver,the clock also determining the difference in time between producing the wave from the transmitter and receiving the second reflected wave front from the transmitter at the first directional receiver and receiving the second reflected wave front from the transmitter at the second directional receiver;a comparator for determining the difference in time between producing the first wave front at the transmitter and receiving the first reflected wave front at the first receiver, and producing the second wave front at the transmitter and receiving the second reflected wave front at the first receiver;an interpreter for detecting movements within the at least one selected field and mapping the detected movements to control inputs to the computer which include cursor movement on a computer monitor; andat least one input space defined by the at least one selected field and movable to any desired position within the physical range of the transmitter.