METHOD AND DEVICE FOR RECOGNIZING PARTS

PURPOSE:To recognize parts with high precision by constituting a device of first lenses for respective visual fields, a second lens shared among all visual fields, and a shutter member and selecting a central visual field in case of small-sized parts and selecting required visual fields from visual fields in four directions in case of recognition of a part of large-sized parts. CONSTITUTION:The device consists of the first lenses 13 for respective visual fields, the second lens 14 shared among all visual fields, and a shutter member 15 to move the recognition visual field with one picture recognizing device. Visual fields are properly selected from the central visual field 2 and visual fields 3a-3d in four directions, namely, five visual fields in total to recognize parts, and the central visual field 2 is selected in case of small-sized parts 1a. Required visual fields 3a-3d are selected on demand to recognize parts; for example, the visual field 3a is selected in case of recognition of a part of large-sized parts 1b and the visual field 3b is selected in case of recognition of another part. Thus, small-sized parts as well as large-sized parts are recognized with high precision.