OPTICAL INFORMATION READING DEVICE, CONTROL METHOD OF OPTICAL INFORMATION READING DEVICE AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an optical information reading device capable of searching for tolerable depth.SOLUTION: A reader 3 includes an AF mechanism 11 for adjusting a focusing position of an optical system, an imaging element 10 for imaging a two-dimensional code 6 provided at a workpiece 2, and a decoding part 13 for decoding an image data acquired with the imaging element 10. A calculation part 23 acquires a decoding result by the decoding part 13 for each picture data that is obtained with the imaging element 10 for each adjustment amount when the adjustment amount at the AF mechanism 11 is changed at a plurality of steps. It acquires correspondence relation between the decoding result and a reading distance obtained by reducing the adjustment amount, and calculates tolerable depth based on the correspondence relation.SELECTED DRAWING: Figure 3