G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/55 (2006.01) B41F 33/00 (2006.01) B41M 1/28 (2006.01) H04N 7/18 (2006.01)
Patent
CA 2280522
This automatic system (1) detects printing faults on metallised strips (3) or any other printing support comprising a predominance of specular colour surfaces. The said system, arranged in a blackout casing (2), comprises an arm (30) on which there can move automatically a lighting unit (10) provided with a video camera (55). The camera has a variable-focus lens (56) which, through a semi-transparent filter (57) disposed in an oblique position in front of the lens, continuously films a portion of the strip (3) of a format (7) of variable size. The illumination of this strip portion is provided by two direct-illumination flashlights (12, 14), provided primarily to illuminate the non-specular surfaces of the strip, and by two other indirect-illumination flashlights (11, 13), advantageously provided to illuminate the specular colour surfaces. One of the two flashlights (11, 13) comprises a translucent flat diffuser (27) disposed on its leading front surface and oriented preferentially in the direction of the semi-transparent filter (57), while the other flashlight (11) is oriented in the direction of the surface of a concave and opaque diffuser (25). Enclosing the semi-transparent filter (57), the diffuser (25) is mounted at its centre on a sleeve (26) which provides the mechanical and optical connection between the diffuser (25) and the lens (56) of the camera (55).
Porret Olivier
Toma Claude
Bobst S.a.
Smart & Biggar
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