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Print Contrast Signal Meter

IP.com Disclosure Number: IPCOM000092754D
Original Publication Date: 1967-Jan-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

ter Voort, L: AUTHOR [+2]

Abstract

The apparatus evaluates the print quality of characters on a document. Operation is half-automatic. The procedure performed by the operator is as follows. The document is positioned face down on the X-Y table. The table is shifted so that desired character is projected on the frosted glass screen. The drum is rotated until the corresponding template is in an operative index position. Thus a negative transparency of the subject character is projected on the screen. The superposed images are viewed and the table is adjusted in order to align the original positive image with the reference negative image. The pantograph pin is put in a guide groove of the template. The illumination of the template is extinguished so that also a photocell connected to circuitry, not shown, is closed.

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Print Contrast Signal Meter

The apparatus evaluates the print quality of characters on a document. Operation is half-automatic. The procedure performed by the operator is as follows. The document is positioned face down on the X-Y table. The table is shifted so that desired character is projected on the frosted glass screen. The drum is rotated until the corresponding template is in an operative index position. Thus a negative transparency of the subject character is projected on the screen. The superposed images are viewed and the table is adjusted in order to align the original positive image with the reference negative image. The pantograph pin is put in a guide groove of the template. The illumination of the template is extinguished so that also a photocell connected to circuitry, not shown, is closed. The pantograph is handled such that pin follows guide groove. Thus the photocell below the viewing screen is made to describe either the character centerline or the character outline limit, depending upon which groove the pin is put in.

During this last step, the momentary photocell output is related electronically to reference white as sensed by a stationary photocell offset from the character image. These relative values are recorded by a chart recorder not shown.

The drum is exchangeable to accommodate other character fonts. The templates are manufactured by conventional engraving or etching techniques. The negative transparencies are glued to suitable light...