Browse Prior Art Database

Character Selection and Positioning

IP.com Disclosure Number: IPCOM000090223D
Original Publication Date: 1969-Mar-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 26K

Publishing Venue

IBM

Related People

Chang, DC: AUTHOR

Abstract

Common light deflector drive and minimized optical losses are obtained in this electro-optically controlled collapsing font system. Light deflector 2 accepts a beam from source 1 of collimated polarized light. Deflector 2 selects a character from character mask 4 for subsequent positioning on output medium 6. A second light deflector 3 accepts the selected character from mask 4 to position it through imaging lens 5 on medium 6.

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Character Selection and Positioning

Common light deflector drive and minimized optical losses are obtained in this electro-optically controlled collapsing font system. Light deflector 2 accepts a beam from source 1 of collimated polarized light. Deflector 2 selects a character from character mask 4 for subsequent positioning on output medium 6. A second light deflector 3 accepts the selected character from mask 4 to position it through imaging lens 5 on medium 6.

To minimize the optical losses of the system, the electro-optic switches of deflector 2 have their electrodes disposed on its crystal faces such that they do not encounter the light beam. The electrodes of the electro-optic switches of deflector 3 are conventionally positioned across the faces of the electro-optic crystals so that they encounter the incident light. Although large crystal lengths are traversed by the light beam in deflector 2, there is substantially no optical loss in such deflector as the light does not traverse the electrodes. Such large crystal thicknesses can be tolerated in deflector 2 as the beam emitted by source 1 is collimated. As the light beam carrying a selected character is not in a collimated state after passage through mask 4, the electro-optic switches of deflector 3 are positioned in the conventional manner. The noncollimated beam of light cannot traverse such large crystal thicknesses. This is due to the undesirable zero field birefringence and attendant poor numeric ape...