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Browse Prior Art Database

Ink Jet Measurements

IP.com Disclosure Number: IPCOM000051320D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Liberatore, DF: AUTHOR

Abstract

Deviations of an ink jet nozzle edge from the vertical, the ink jet fro the horizontal and the ink jet from a gutter are calculated by digitally acquiring three points displayed on a video monitor image of the nozzle and jet and then calculating the slopes of two lines defined by these points.

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Ink Jet Measurements

Deviations of an ink jet nozzle edge from the vertical, the ink jet fro the horizontal and the ink jet from a gutter are calculated by digitally acquiring three points displayed on a video monitor image of the nozzle and jet and then calculating the slopes of two lines defined by these points.

The trajectory of a jet of ink from a nozzle to a gutter is viewed on a video monitor attached to a video camera placed to frame the nozzle edge and a portion of the ink jet. An X-Y digitizer (for example, the CVI Model 622 X-Y Digitizer manufactured by Colorado Video, Incorporated) connects the video channel to a digital computer and supplies a movable cursor visible on the monitor screen.

In Fig. 1, deviations of the nozzle edge (falling on a line L ) and ink jet trajectory (along line L(2)) from the vertical and horizontal, respectively, may be defined in terms of the slopes M(1) and M(2) of lines L(1) and L(2). An operator moves the cursor to one point P(1) and P(3) on each of lines L(1) and L(2) and a point P(2) at the intersection of lines. For each of these positions, a corresponding set of digital coordinates X , Y(1) ; X(2), Y(2) ; and X(3), Y(3) is supplied to the computer. The computer th calculates the slopes M(1) and M(2) of lines L(1) and L(2) using the relationshi See Original.

In Fig. 2, the distance d of the ink jet from the top of the gutter is calculated using either a second camera or repositioning the camera 90 degrees around the in...