LASER SCANNING CODE SYMBOL READING SYSTEM PROVIDING CONTROL OVER LENGTH OF LASER SCAN LINE PROJECTED ONTO A SCANNED OBJECT USING DYNAMIC RANGE-DEPENDENT SCAN ANGLE CONTROL

摘要

Method of and system for reading bar code symbols using a hand-supportable laser scanning bar code symbol reading system supporting an improved level control over the length of laser scan lines projected onto scanned objects, at any instant in time, in a manner dependent the detected location, distance or range of the scanned object in the scanning field of the system during system operation. The length characteristics of the laser scan line are controlled by setting the laser scan sweep angle as a function of detected or estimated distance or range of the object from the system. In the illustrative embodiment, the laser scan sweep angle is controlled by supplying a drive current to the scanning mechanism, as a function of detected or estimated distance or range of the object from the scanning system.