Registers – Coded record sensors – Particular sensor structure
Patent
1990-01-16
1992-06-30
Levy, Stuart S.
Registers
Coded record sensors
Particular sensor structure
235470, 235472, 318129, G06K 710, H02K 3300, H02P 100, H02P 300
Patent
active
051265451
ABSTRACT:
A lightweight hand-held scanning device for repetitively scanning a laser light source having a laser light generating means and at least one high speed scanning motor controlled by a motor drive circuit which adjusts the amplitude and presets the frequency of oscillation of a high speed scanning motor. The frequency and amplitude regulation is accomplished by using an open loop control system that supplies two opposing stator windings of the scanning motor with a pair of periodic triangular current waveforms that are 180 degrees out of phase for energizing an de-energizing the stator coils respectively. The energizing and de-energizing of the opposing stator coils causes variations in the magnetic strength of these coils, thereby causing the rotor to alternately align itself with the energizing stator coil which results in a smooth oscillating motion of the motor shaft. By adjusting the amplitude, and presetting the frequency of oscillation of the high speed scanning motor, the motor can maintain a consistent scanning speed and use less power.
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Glembocki Christopher R.
Levy Stuart S.
Symbol Technologies Inc.
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