Patent ID: 9286497
Filing Date: 2016-03-15
CPC Classification: G06K

Claim Text:
1. An image reading device comprising: an illumination system includes one or more illumination sources to produce illumination light and an illumination circuit to drive the illumination sources; an image sensor for capturing light reflected from a target illuminated with the illumination light during an exposure period; and a processor for controlling the illumination system, reading light data captured by the image sensor during a read-out period after the exposure period and decoding an image based on the light data during a decoding period after the read-out period; wherein the processor causes the illumination circuit of the illumination system to produce a first illumination light having a first intensity level continuously during a base illumination period that includes the exposure period and the read-out period by driving the one or more illumination sources, and a second illumination light having a second intensity level higher than the first intensity level during a pulsed illumination period having at least one pulse length in the base illumination period by overdriving the one or more illumination sources.