Patent ID: 8575537

Claim:
A proximity sensor, comprising: a substrate with a length L and a width W, wherein L is less than is less than 10 millimeters and W is less than 5 millimeters; a first transmitting unit attached to the substrate, the first transmitting unit configured to transmit a first signal in a first direction; a first receiving unit attached to the substrate, the first receiving unit configured to receive at least a portion of the first signal transmitted in the first direction; a second transmitting unit attached to the substrate, the second transmitting unit configured to transmit a second signal in a second direction, wherein the second transmitting unit is adjacent to the first transmitting unit and the second signal in the second direction is perpendicular and does not intersect to the first signal in the first direction; a second receiving unit attached to the substrate, the second receiving unit configured to receive at least a portion of the second signal transmitted in the second direction; and logic in communication with the first transmitting unit, first receiving unit, second transmitting unit, and second receiving unit, the logic configured to detect whether at least a portion of the first signal transmitted from the first transmitting unit has been received by the first receiving unit or when at least a portion of the second signal transmitted from the second transmitting unit has been received by the second receiving unit.