Browse Prior Art Database

Optical Printer

IP.com Disclosure Number: IPCOM000090638D
Original Publication Date: 1969-Jun-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Eichelberger, EB: AUTHOR [+4]

Abstract

An optical printer utilizes an m-by-n array of holograms which consist of partially transparent interference patterns, so constructed that each hologram images a single character in a certain print position whenever illuminated by a light beam.

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Optical Printer

An optical printer utilizes an m-by-n array of holograms which consist of partially transparent interference patterns, so constructed that each hologram images a single character in a certain print position whenever illuminated by a light beam.

As in A, laser source 10 passes a beam through modulator 12 and digital light deflector 14 which provides vertical deflection, and onto rotating mirror 16 which provides horizontal deflection. Thus any one of m characters in each of n columns of hologram array 18 can be selected for projection onto photosensitive medium 20 in its respective print position.

By making array 18 of holograms with a reference beam conjugate to a readout beam which is focused on the face of mirror 16 as in B1 and B2, a stationary first-order real image is formed. Such occurs irrespective of the position of the beam on the hologram, thus eliminating the problem of character resolution with a moving beam.

By displacing the light beam from a to a' and allowing mirror 16 to rotate slightly, the angle between the light beam and the hologram can be changed. As in C, the beam follows the path a', b', c instead of a, b, c and images the same character at d' instead of d. By using any one of a number of parallel light beams and appropriately selecting the proper angle of mirror 16, a single hologram can be used to image characters in mp different positions where m is the number of holograms in the hologram array and p is the number of par...