Northern Telecom Limited

John S Wei

William D Westwood

Kenneth Arnold Pickar

Robert R Parsons

A scanning device for use in a facsimile system is formed on a semiconductor substrate. The substrate has an array of apertures, the boundary of each aperture presenting a pn junction which functions as a photodetector when appropriate bias is applied through sensing and addressing circuits. A light is directed through the apertures from one side of the substrate to be incident on a document located against the other side. The boundaries of the apertures are contoured so that the photodetectors intercept light reflected from the document but are shielded from direct light. In use, the document and the scanning device are slid past one another at a rate commensurate with the rate of operation of the addressing circuit.

Document scanning head

An optical system provides a multiple image of a linear object, the images focussed on an image array, with the images displaced both laterally and longitudinally relative to each other, a different section of each image in a contiguous, side-by-side position. The multiple imaging is obtained by a plurality of mirrors in a stacked array, the mirrors each tilted about a first axis and rotated about a second axis, the tilt and rotation increasing progressively from the front mirror. The mirrors each have a predetermined optical transmission characteristic, being a maximum for the front mirror and decreasing progressively to the rearmost mirror.

Optical system for multiple imaging a linear object

An optical system for imaging an elongate object comprises at least two prisms back to back and means for laterally displacing light rays from part of the image prior to passage through the prisms, so that a series of images are formed in side-by-side arrangement. The images will be displaced relative to each other in the direction of the longitudinal axis of the object but are still overlapping so that a section across the images will include all of the object. By increasing the number of prism pairs, further apparent subdivision of the object can be obtained.

Optical system for imaging an elongate object in rearranged sections

An optical system for a scanning apparatus uses a folded optical path with certain mirrors moving, the movement of the mirrors such that the length of the optical path, and thus the magnification, is maintained constant. Either a fixed or movable lens system can be provided. With a fixed lens system there is differential movement of mirrors. With a moving lens system, the lens system and image receiver move in fixed relationship with the scanning mirror.

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Ottawa, Canada

John S Wei