Patent ID: 8181878
Filing Date: 2012-05-22
Classification: G06K

Abstract:
1. A method of indicating an in-focus condition for a two-dimensional imaging device that senses a coded pattern on a target, the method comprising: generating two beams of light from two spaced apart aiming light sources; aiming and shaping the two beams of light to produce two spaced apart illuminated aiming marks on the target without an intersection of said two respective beams with each other or with a central axis passing through a center of a field of view on the target; and signaling at least one of an in-focus condition or an out-of-focus condition when the two illuminated aiming marks are in a pre-defined relationship relative to each other on the target and inside the field of view; wherein the in-focus condition or an out-of-focus condition is signaled through a digital output to an external host.