Burroughs, Inc.

Thomas Robson

Richard C Fedder

George C Schafner

Aubrey E Thompson

Thomas F McMahon

Novel apparatus (probe) for sensing and controlling the surface charge on an electro-photographic copier drum in which a hollow, cylindrical, tubular shield member provided with a single elongated aperture therein houses a rotatable charge receiving, insulatingly segmented, rod-like fluted member, the latter extending centrally through the shield member. The elongated slot of the outer shield member extends from edge-to-edge of the drum and in close, spaced proximity thereto. One end of the probe apparatus carries an electromagnetic, Hall effect transducer including a phasing paddle wheel member rotatable with the segmented member for timing and synchronizing the rotation of the probe with the drum rotation. The probe is disposed between two spaced apart drum charging corotrons. The probe senses the surface charge on the drum and compares this charge with a known standard charge level. An output potential level derived from this comparison is incremented or decremented in accordance with the comparison level and the derived charge is automatically applied to the drum surface via the charging corotrons.

Electrostatic charge probe for electrophotographic apparatus

A self contained, demountable, unitary modular optical system for a Solid State Laser Diode Printer/Copier utilizes a folded light beam path whereby laser light is collimated through a compound four element collimating objective lens assembly, passed through a cylindrical lens focussing the beam to a horizontal line image onto the facets of a rotatable polygon mirror assembly. The beam is then passed through a cylindrical meniscus lens focussing the beam to a small dimension in the scanning or horizontal direction. A pair of cylindrical-spherical lenses with the corresponding centers of the cylindrical and spherical surfaces located near the facet of the polygon provide cross-scan focussing in the vertical direction as well as approximating a pair of toridal lenses. Horizontal and vertical spot size can thus be independently focussed.

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Orlando, FL, United States of America

Thomas Robson