Patent ID: 6653621
Filing Date: 2003-11-25
Classification: G02B,G06K

Abstract:
An apparatus for producing a plurality of resonant optical MEMs scanners from a single wafer, each MEMs scanner having a movable body that moves at a desired resonant frequency and carries one or more removable masses, comprising:a first electrical signal source configured for coupling to each respective MEMs scanner while the MEMs scanner is an integral part of the wafer, the first signal source being operative to produce a first input signal for activating the respective optical scanner; a position sensor coupled to the movable body of the respective MEMs scanner and operative to produce an electrical signal indicative of movement of the movable body while the MEMs scanner is an integral part of the wafer; a reference signal source operative to produce a reference signal at the desired resonant frequency; an electronic controller coupled electrically to the position sensor and the reference signal source, the controller being operative to produce an error signal indicative of a difference between a frequency of movement of the movable body and the desired resonant frequency; and a mass removal apparatus responsive to the electronic controller to remove selected portions of the removable masses while the respective MEMs scanner is an integral part of the wafer.