Method for operating a laser scanner

摘要

A method for operating an indicia reader such as a laser scanner is provided. The method affords a simplified technique for monitoring the offset between the drive frequency and the resonant oscillation frequency of the laser scanner. The phase offset between the drive frequency and the sense frequency is monitored to derive the drive frequency's offset from the resonant oscillation frequency.

主权项

1. A method for operating an indicia reader, comprising:
providing a laser scanner that includes (i) an indicia-capturing subsystem for acquiring information about indicia within the indicia-capturing subsystem's field of view, the indicia-capturing subsystem including a light-deflecting assembly having a resonant oscillation frequency, and the indicia-capturing subsystem including a sense mechanism for generating a sense frequency associated with oscillation of the light-deflecting assembly, and (ii) an indicia-decoding processor for decoding indicia information; driving the indicia-capturing subsystem's light-deflecting assembly at a drive frequency; monitoring the sense frequency; and predicting, based on the phase shift between the drive frequency and the sense frequency, the resonant oscillation frequency of the indicia-capturing subsystem's light-deflecting assembly.