Patent ID: 6237850
Filing Date: 2001-05-29
Classification: G06K

Abstract:
A bar code reader, comprising:a transmitter including a light source,a vibrating mirror which scans bar codes using a light beam from said transmitter and collects light reflected by the bar codes,a receiver made up of a light sensor which converts the reflected light that is collected into electrical signals,a decoder which converts the electrical signals from said receiver into data characters,determining means for determining a time period in which there is no change in the amount of the reflected light, anda vibration angle adjuster means for scanning the bar codes while changing the angle of vibration of said vibrating mirror, wherein said vibration angle adjuster means stepwisely decreases the angle of vibration of the vibrating mirror in order to stepwisely decrease the scanning region for the bar codes when said determining means determines said time period to be longer than a first predetermined value.