Low deflection force sensitive pick

Details Low deflection force sensitive pick Low deflection force sensitive pick

H - Electricity

01

L

356/187

H01L 21/00 (2006.01) H01L 21/677 (2006.01)

Patent

CA 1276317

Abstract of the Disclosure A tactile pick includes a base and a lever attached beneath the base by a pivot. A load sensing device including a strain gauge is located between the base and the portion of the lever on one side of the pivot; the portion of the lever on the other side of the pivot is adapted to receive a semiconductor wafer. Rotation of the lever about the pivot induced by the weight of a wafer causes an actuator to depress a flexible member on which a strain gauge is mounted. The output signal of the strain gauge is processed by a controller to provide an output signal which varies monotonically with the magnitude of the weight placed on the wafer receiving portion of the lever. The pick is employed in connection with the wafer transport system which transfers wafers from a cassette to the pick lever.

560961

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