Patent ID: 8308645

Claim:
An ultrasonic scanhead comprising: an encoder comprising a fixed element and a rotary element, wherein the rotary element is disposed at the fixed element and capable of rotating about a first axis; a pivot extending along a second axis, having a first distal end passing through both fixed and rotary elements of the encoder and a second distal end opposite to the first distal end, and capable of rotating with the rotary element; a voice coil motor comprising a stator and a mover, wherein the first distal end of the pivot is connected to the mover, and the mover is capable of moving linearly along a third axis and moving relatively to the stator, and the first axis, the second axis and the third axis are substantially perpendicular to each other; and a transducer disposed at the second distal end of the pivot and capable of emitting an ultrasonic wave.