The Mead Corporation

Robert C Howard

Rodger L Gamblin

Donald L Head

An optical encoder for scanning a master image at scan points positioned in a plurality of parallel scan rows across the master image includes a means for illuminating the master image. A plurality of photoelectric scanning means, each such scanning means including a row of photoelectric transducers, provides electrical signals in dependence upon the amount of light striking the transducers. Light is directed from the master image by a focusing arrangement toward a first one of the photoelectric scanning means such that the first photoelectric scanning means receives light from an associated one of the scan rows on the master image. An optical diversion means includes one or more half silvered mirrors which divert a portion of the light directed toward the first photoelectric scanning means such that it strikes the others of the plurality of photoelectric scanning means whereby each of the scanning means receives light from an associated one of the plurality of scan rows on the master image.

Optical encoder

An ink jet printing device is provided of the type having a manifold (10) forming a liquid reservoir (11) with means (12) for supplying the reservoir (11) with liquid under pressure, a flexible orifice plate (13) forming one side of the reservoir (11) and containing a plurality of orifices (14) disposed in at least one row through which the printing liquid is expelled, means (18) for stimulating the orifice plate (13) to cause traveling wave vibrations there along so as to induce formation of uniform filaments and droplets from the orifice plate (13), means (15) for electrically charging selective ones of the droplets coming from the orifices (14) and further means (16) for catching the selectively charged droplets. A vibration damping means (21, 26, 32) is provided which engages an end portion or end portions of the orifice plate (13) beyond the end of the rows of orifices (14) for substantially completely damping out the traveling wave vibrations in the orifice plate (13) as they reach the end portions, with the damping means(21, 26, 32) having a V-shaped cross sectioned portions (22, 28, 36) in a plane parallel to the orifice plate (13) with the apex (23) of the V-shaped portion (22, 28, 36) extending towards the oncoming traveling waves. An alternative embodiment uses the damping means (21,26,32) in engagement with a pressure plate (40) which is liquid coupled to the orifice plate (13).

Damping means for an ink jet printing device

A dot matrix copying device includes optical rectification apparatus comprising storage means for storing image information in dot matrix form and means for transferring the stored information to a dot matrix print head. The image information is derived by simultaneously scanning an original document and an optical grating positioned adjacent thereto and directing the scanned scene toward an array of photosensing elements, one of which is positioned to view the optical grating. The optical data so derived is stored in the storage means under timing control of the photosensing element which views the optical grating.

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Arcadia, CA, United States of America

Robert C Howard