Apparatus for and method of inspecting sheet body

Details Apparatus for and method of inspecting sheet body Apparatus for and method of inspecting sheet body

2005-08-09

2005-08-09

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

C250S559400, C250S559420, C356S239100, C356S430000

Reexamination Certificate

active

06927408

ABSTRACT:
When a film is rewound, light is applied from light-emitting units to the film, and light that has passed through the film is detected by light-detecting units to detect a plurality of inclined defects in the film based on a change in the intensity of the light transmitted through the film. Slits oriented in the direction of the inclined defects are disposed in front of the light-emitting units and the light-detecting units. Detected signals outputted from the light-detecting units are transmitted to a processing device and processed thereby. The processing device processes the signals by approximating a maximum value array of extremal values of the signals in respective reference lengths of the film, with two functions in zones, and identifying a boundary between the zones as a position where a defect disappears.

REFERENCES:
patent: 5452079 (1995-09-01), Okugawa
patent: 6011620 (2000-01-01), Sites et al.
patent: 2-216437 (1990-08-01), None

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