Optical scanner

Details Optical scanner Optical scanner

1998-10-20

2000-05-30

Spyrou, Cassandra

Optical: systems and elements

Deflection using a moving element

By moving a reflective element

359212, 359226, 318696, G02B 2608, H02P 800

Patent

active

060697261

ABSTRACT:
An optical scanner includes a support frame which rotatably supports a mirror. A stepper motor is provided for turning a cam which abuts the mirror. The motor imparts force to the mirror to define a scan profile when the cam is rotated. The scanner further includes a resilient member which applies force to the mirror, which, in turn, counteracts and cancels the force provided by the cam. Due to the cancellation of the force provided by the cam and the resilient member, no bending forces are applied to the mirror. The optical scanner further includes a control mechanism for applying sinusoidal currents to the stepper motor. More specifically, the control mechanism provides sine and cosine waveforms, and the control mechanism commutates the motor with the sine and cosine waveforms. The sine and cosine waveforms are pre-stored in a memory. In exemplary embodiments, the control mechanism provides constant velocity in one direction, and a fast retrace in an opposite direction. The control mechanism controls the motor without the use of feedback, thereby reducing the complexity and cost of the scanner.

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