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GRADED STITCH PAGEWIDTH ARRAY

IP.com Disclosure Number: IPCOM000026012D
Original Publication Date: 1989-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Document File: 4 page(s) / 125K

Publishing Venue

Xerox Disclosure Journal

Abstract

The construction of pagewidth arrays 10 of marking elements, such as, for exam le, thermal ink 'et arrays, could be accomplished by composing smaller modules could be butted edge-to-edge, stacked in an interleaved fashion like bricks, or assembled on opposite sides of a central registration bar 16. For ink jet arrays, a key problem is bringing the active transducer elements to within a small fraction of a pixel of the desired position on opposite sides of the "joints" or abutted edges 14. The allowable tolerance is only a few microns. An additional problem for an ink jet system is the differing aerodynamic behavior of the end marking elements compared to those in the center of an array when a stacked approach is used as in Figures lb and lc.

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Page 1 of 4

.EROX DISCLOSURE JOURNAL

GRADED STITCH PAGEWIDTH ARRAY
Stephen F. Pond

Proposed Classification

U.S. C1.346/75 Int. C1. Gold 15/18

1

FIG. la

FIG. 7b

I L I

12' FIG. 7c

Volume 14 Number 5 September/October 1989 22 1

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Page 2 of 4

GRADED STITCH PAGEWIDTH ARRAY (Cont'd)

A

v

L

16

The construction of pagewidth arrays 10 of marking elements, such as, for exam le, thermal ink 'et arrays, could be accomplished by composing smaller

modules could be butted edge-to-edge, stacked in an interleaved fashion like bricks, or assembled on opposite sides of a central registration bar 16. For ink jet arrays, a key problem is bringing the active transducer elements to within a small fraction of a pixel of the desired position on opposite sides of the "joints" or abutted edges 14. The allowable tolerance is only a few microns. An additional problem for an ink jet system is the differing aerodynamic behavior of the end marking elements compared to those in the center of an array when a stacked approach is used as in Figures lb and lc.

The "butt joint" or image joint in the stacked array construction method can be blended by adding an overlapping set of jets. Studies suggest, in the context of carriage motion image bands, that tolerances can be assisted by a factor of two through the use of 6 to 8 overlapping marking elements 20 with "graded stitch" selection of the printing done by jets 18 in the overlap region "d". For example, in Figure 2, the situation of three overlapping jets 18 is shown between A and B modules in an array construction such as that shown in Figure lc. By varying the probability for printing the blended scan lines in a graded fashion, as indicated in Table I, th...