Web defect scanning apparatus with incandescent illumination mea

Details Web defect scanning apparatus with incandescent illumination mea Web defect scanning apparatus with incandescent illumination mea

1988-12-27

1990-04-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

355 69, G01N 2188

Patent

active

049143085

ABSTRACT:
In a scanning apparatus, a scanned transverse region of a moving web is illuminated by focused illumination from an elongate incandescent lamp with a long filament maintained in tension and supported only at its ends to prevent shadows or other luminance variations along the length of the lamp.

REFERENCES:
patent: 1041100 (1912-10-01), Knowles
patent: 1104807 (1913-07-01), Knight
patent: 3739219 (1973-06-01), Carley
patent: 3814946 (1974-06-01), Takahashi et al.
patent: 4186431 (1980-01-01), Engel et al.
patent: 4682040 (1987-07-01), Hohki et al.
patent: 4752897 (1988-06-01), Zoeller
patent: 4801810 (1989-01-01), Koso
patent: 4816875 (1989-03-01), Takeda

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