FOLDED PATH SEQUENTIAL SCREENING SHADOWGRAPH

Publishing Venue

Xerox Disclosure Journal

Abstract

A screening shadowgraph for a copier optical system is shown in the figure. The device comprises a small lamp having a filament 2, parallel mirrors 4, 6, baffles 8, 10, a beam directing mirror 12 and a screen 14. The mirrors are masked in areas 4A, 6A to prevent overlapping of the beams creating, in effect, parallel rows of mirror segments 4', 6'.

'EROX L DISCLOSURE JOURNAL

FOLDED PATH SEQUENTIAL SCREENING SHADOWGRAPH U.S. C1. 355/8
George R. Simpson
Joseph P. Taillie

Proposed Classification

Int. CI. G03g 15/28

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A screening shadowgraph for a copier optical system is shown in the figure. The device comprises a small lamp having a filament 2, parallel mirrors 4, 6, baffles 8, 10, a beam directing mirror 12 and a screen 14. The mirrors are masked in areas 4A, 6A to prevent overlapping of the beams creating, in effect, parallel rows of mirror segments 4', 6'.

Volume 5 Number 1 January/February 1980 95

FOLDED PATH SEQUENTIAL SCREENING SHADOWGRAPH (Cont'd)

In operation, the portion of the light from filament 2 not blocked by baffles 8 and 10 falls onto a first mirror segment 4'. This beam is reflected from segments 4', 6' and caused to follow a folded path until it emerges to be reflected from mirror 12 to screen 14, which provides the desired modulation at the surface of a photoconductor 16. The folded path thus allows the device to be compactly constructed and without shortening the distance from source to screen 14.

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   XEROX DISCLOSURE JOURNAL Volume 5 Number 1 January/February 1980