Patent ID: 6445452
Filing Date: 2002-09-03
Classification: G01N

Abstract:
A sheet wrapping package inspecting device which detects a defect of at least one of a wrapping sheet and an object to be wrapped, such as at least one of shape, crack, broken piece, dirt, stain, mixed foreign material and the like, comprising:a first light source (3; 14) for lightening the wrapping sheet (1; 16), said first light source being located at a first side of the wrapping sheet; a second light source (5; 14, 17), for lightening the wrapping sheet (1; 16), said second light source being located at a second side of the wrapping sheet; a two-dimensional sensor (2; 11) located at one of said first and second sides of the wrapping sheet and object (1; 16), for observing the wrapping sheet and object so as to produce signals of a reflected ray image of said wrapping sheet and object by light rays originating from one of said first and second light sources, and signals of a transmitted ray image of said wrapping sheet and object by light rays originating by the other of said first and second light sources; and a signal processing means (7) being provided for putting signals derived from said reflected ray image and from the transmitted ray image into mutual relationship, wherein said signal processing means (7) is provided for binarization or multi-valuing of the reflected ray image and of the transmitted ray image so as to create a code distribution image.