Proximity sensor with adaptive threshold

Details Proximity sensor with adaptive threshold Proximity sensor with adaptive threshold

2005-08-23

2005-08-23

Gutierrez, Diego (Department: 2859)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Cursor mark position control device

C345S163000, C250S221000

Reexamination Certificate

active

06933922

ABSTRACT:
A proximity sensor measures receptor output with an energy source deactivated. The sensor then measures receptor output with the energy source activated. The measurements with the energy source activated are compared to the measurements with the energy source deactivated to compensate for the effect of ambient conditions. A near condition is recognized if the change between the two groups of measurements exceeds a designated value. To compensate for receptor output that may decrease after reaching a peak value during approach of an object, a near condition can be maintained until the change between the two groups of measurements no longer exceeds a different designated value. Multiple sensors can be used to avoid false near conditions caused by, e.g., placing a device equipped with the sensors next to a stationary object. In one embodiment, a sensor comprises an infrared light emitting diode and a phototransistor.

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