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A pair of piezoelectric transducers (PZTs) functions linearly with adequate frequency response to control motion of a laser beam for operating on an impelled workpiece without relative motion.
English (United States)
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Laser Beam Scanning Device
A pair of piezoelectric transducers (PZTs) functions linearly with adequate
frequency response to control motion of a laser beam for operating on an
impelled workpiece without relative motion.
In the figure, pulsed laser beam 1 passes through lens 2 and reflects from
mirror 3 onto a workpiece 4 carried by moving belt 5. Beam 1, which may be
used for drilling, is preferred to impinge on a workpiece without relative motion.
As the workpiece moves, PZTs 6 and 7 held in stationary bracket 8 are
oppositely contracted and expanded at an energization rate to cause mirror 3 to
rotate about pivot 9. Energization signals are produced in source 10 and applied
through operational amplifier 11. Variable beam deflection distances and PZT
motion limits can be accommodated by altering the arm length between the
fulcrum and PZT actuating points on the mirror back. Pulse rise time of
operational amplifier 11 can also be varied to produce the necessary beam