Browse Prior Art Database

S C LOSU RE JOU RNA L A HALF TONE IMAGING SCREEN

IP.com Disclosure Number: IPCOM000023492D
Original Publication Date: 1977-Dec-31
Included in the Prior Art Database: 2004-Mar-31
Document File: 2 page(s) / 269K

Publishing Venue

Xerox Disclosure Journal

Abstract

Screen 28 includes a substantially clear, transparent sub-strate 78 having a plurality of spaced grooves inscribed therein. A first set of grooves 80 having a width "a" is inscribed in substrate 78. A second set of grooves, 82 having a width "b" is also inscribed in substrate 78. Each groove 82 of the second set is interposed between two adjacent grooves 80 of the first set, In this manner, a repetitive pattern is formed wherein the grooves of the first set alternate with the grooves of the second set, Grooves 80 and 82 are substan-tially parallel to one another and extend substantially normal to the longitudinal axis of screen 28, Width "a" of groove 80 is greater than width "e" of groove 82, Preferably, width "a" is 30 percent of the distance "1" between successive grooves 80. Contrawise, width "e" is 20 percent of the distance "1" between successive adjacent grooves 80. The phase shift be-tween successive adjacent grooves 80 is preferably about 180°. Similarly, the phase shift between successive grooves 82 is also about 180°. The frequency f1 between successive adjacent grooves 80 and the frequency f2 between successive adjacent grooves 82 is substantially the same. The space "b" between adjacent grooves 80 and 82 is about 30 percent of the distance "1" between successive adjacent grooves in one embodiment thereof. In the corresponding embodiment, the distance "d" between grooves 80 and 82 is about 20 percent of the distance "1" between adjacent grooves 80. In an alternate embodiment, the distance "b" is 25 percent of the distance "1" between

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S C LOSU RE JOU RNA L

A HALF TONE IMAGING SCREEN Proposed Classification
~I~hard M. Bobbe U.S. Cl. 96/1R
mt. Cl. G03g

Screen 28 includes a substantially clear, transparent sub-~
strate 78 having a plurality of spaced grooves inscribed
therein. A first set of grooves 80 having a width "a" is
inscribed in substrate 78. A second set of grooves, 82 having
a width "b" is also inscribed in substrate 78. Each groove 82
of the second set is interposed between two adjacent grooves

80 of the first set, In this manner, a repetitive pattern is
formed wherein the grooves of the first set alternate with the
grooves of the second set, Grooves 80 and 82 are substan~

tially parallel to one another and extend substantially normal
to the longitudinal axis of screen 28, Width "a" of groove 80
is greater than width "e" of groove 82, Preferably, width "a"
is 30 percent of the distance "1" between successive grooves
80. Contrawise, width "e" is 20 percent of the distance "1"
between successive adjacent grooves 80. The phase shift be~-
tween successive adjacent grooves 80 is preferably about 180°.
Similarly, the phase shift between successive grooves 82 is
also about 180°. The frequency f1 between successive adjacent
grooves 80 and the frequency f2 between successive adjacent
grooves 82 is substantially the same. The space "b" between

adjacent grooves 80 and 82 is about 30 percent of the distance
"1" between successive adjacent grooves in one embodiment
thereof. In the corresponding embodiment, the distance...