A brushless DC motor structure including a motor body, a controller, and a fan radiator. The illuminator has a plurality of groove groups 2 extending in a parallel to one side face 10, close to which a light source is disposed, each group including one or more grooves, and a flat face 16 bridging the groups 2-1 and 2-2, in the bottom surface 9. Each collected digital data set represents a frame of data displayed on a terminal of the host computing system by the video controller and is stored in a storage device associated with the frame grabber. In this practice, the signals undergo the multi-screen processing via multi-screen reproducedecoding control means 11 and displayed on screens split by monitoring camera in a monitoring area or by monitoring area. Further, based on an appearance pattern of the real image or the virtual image, a determination is made as to whether the defect candidate is located on the main surface, inside, or on the rear surface of the transparent plate material. The classifier uses its codebook store to recognize the person.