Eocom Corporation

American Hoechst Corporation

Richard E Amtower

Klaus-Peter Schoen

Steven K Harbaugh

William Jeffers

Norman L McGowan

Engraving apparatus with particular reference to a plate to be engraved having a photosensitive surface in which a write laser beam exposes anid surface by scanning the same in conjunction with a read optical path associated with a copy board positioned proximate the plate. Means, for example, such as a read laser beam scans the copy board, the reflection therefrom being noted and used to control the intensity of the write beam. The optical scanning elements of both the read optical path and the write beam are common to each so that positional error due to vibrations in the optical components is eliminated. Provision is made for read-right conversion to read-wrong during preparation of a plate, both by use of memory circuits and by geometrical arrangement. Independent width and length magnification, other than unity, are also provided.

Laser read-write system for the production of engravings

An electrophotographic apparatus for producing printing masters utilizing modulated laser light as the exposure source and a continuous process for producing such printing masters involving the steps of plate conveyance, synchronous charging and exposure, and electrostatic development and fusing of electrophotographic printing masters suitable for use in offset or lithographic printing processes. The apparatus comprises a transport system for sequentially conveying printing masters to the exposure platen which retains the masters in a fixed plane for synchronous charging and exposure, utilizing as a light source, a modulated laser beam. The optical and deflecting components of the exposure system are mounted in a moveable carriage member adapted to traverse a plane substantially parallel to the plane of the exposure platen such that the exposure laser will raster scan the platen area. The charging coratron is also preferably mounted on the moveable carriage such that the sequence of charging the electrophotographic master and exposure thereof to the raster scan of the exposure laser are synchronous. The apparatus employs an exposure laser having a power of about less than 1 watt, but sufficient power to provide a light energy on the photoconductive surface of the printing master of at least about 2.times.10.sup.-3 millijoules/cm.sup.2 under operating conditions.

Electrophotographic apparatus and method for producing printing masters

Disclosed is a facsimile system having a transmitter for optically scanning input copy to produce modulated electrical signals to be transmitted to a receiver. The receiver responsively controls output optical scanning to form output copy as a reproduction of the input copy. Signal processing in both the transmitter and receiver employs spatial coding. In the transmitter scanner, a spatially coded reference signal, generated by the scanning beam and a spatial mask, is employed. In the receiver scanner, a spatially coded reference signal, generated by the scanning beam and an identical spatial mask is employed also. Therefore, the transmitter and receiver scanners are spatially synchronized without the need for real-time synchronization.

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Laguna Niguel, CA, United States of America

Richard E Amtower