Optical information reading device

A fixed optical information reading device, comprising:

• a first illumination section that irradiates the workpiece with illumination light through a polarization filter;
• a second illumination section that irradiates the workpiece with illumination light without any polarization filter;
• an imaging section provided with a polarization filter having a polarization direction different from a polarization direction of the polarization filter of the first illumination section, the imaging section for receiving light through the polarization filter having the polarization direction different from the polarization direction of the polarization filter of the first illumination section to capture an image of a code provided in the workpiece, the light being irradiated by at least one of the first illumination section and the second illumination section and being reflected at the workpiece;
• a decoding section that decodes image data acquired by the imaging section;
• and
• a reading condition control section that controls a reading condition including an imaging condition of the imaging section and an image processing condition in the decoding section, wherein
• the reading condition control section executes coarse adjustment of a brightness parameter in the reading condition with respect to each of a polarization mode and a non-polarization mode to determine in which of the polarization mode and the non-polarization mode the decoding succeeds more, and further executes fine adjustment of the brightness parameter with respect to the mode in which the decoding succeeds more between the polarization mode and the non-polarization mode, the polarization mode being a mode in which the first illumination section is lighted and the second illumination section is not lighted, the non-polarization mode being a mode in which the first illumination section is not lighted and the second illumination section is lighted.

A fixed optical information reading device, comprising:

• a first illumination section that irradiates the workpiece with illumination light through a polarization filter;
• a second illumination section that irradiates the workpiece with illumination light without any polarization filter;
• an imaging section provided with a polarization filter having a polarization direction different from a polarization direction of the polarization filter of the first illumination section, the imaging section for receiving light through the polarization filter having the polarization direction different from the polarization direction of the polarization filter of the first illumination section to capture an image of a code provided in the workpiece, the light being irradiated by at least one of the first illumination section and the second illumination section and being reflected at the workpiece;
• a decoding section that decodes image data acquired by the imaging section;
• and
• a reading condition control section that controls a reading condition including an imaging condition of the imaging section and an image processing condition in the decoding section, wherein
• the reading condition control section executes coarse adjustment of a brightness parameter in the reading condition with respect to each of a polarization mode and a non-polarization mode, and in the coarse adjustment, the reading condition control section executes code search processing of searching for the code from the image data in one of the polarization mode and the non-polarization mode, when the code is found by the code search processing, the reading condition control section switches to the other mode of the polarization mode and the non-polarization mode to again execute the code search processing, and when the code is not found in the other mode, the reading condition control section stops the adjustment of the reading condition in the other mode to execute the adjustment of the reading condition on the one mode, the polarization mode being a mode in which the first illumination section is lighted and the second illumination section is not lighted, the non-polarization mode being a mode in which the first illumination section is not lighted and the second illumination section is lighted.