Optical transparency detection and discrimination in an electron

Details Optical transparency detection and discrimination in an electron Optical transparency detection and discrimination in an electron

1991-09-06

1994-07-12

Donovan, Lincoln

Photocopying

Contact printing

Light boxes

250561, 355311, 356446, G03G 2100

Patent

active

053293380

ABSTRACT:
A method and apparatus for detecting and discriminating a copy sheet in an electronic reprographic printing system has a diffuse reflective sensor disposed adjacent a portion of the path over which the copy sheet moves. The sensor is disposed so that its optical axis intersects the copy sheet where the angle of intersection between the copy sheet and the optical axis remains within a specified range of angles for the maximum length of the copy sheet. A diffuse reflective sensor is also disposed adjacent inlet baffles with its optical axis aligned so that a transparent copy sheet is not detected while an opaque copy sheet is.

REFERENCES:
patent: 4540887 (1985-09-01), Minerd et al.
patent: 4671309 (1987-06-01), Iemura et al.
patent: 5005049 (1991-04-01), Matsushita
patent: 5049937 (1991-09-01), Takeda
patent: 5132736 (1992-07-01), Muramatsu et al.

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