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公开(公告)号：CA1143782A
公开(公告)日：1983-03-29
申请号：CA374664
申请日：1981-04-03
Applicant: IBM
Inventor： HEIBEIN HARRY P , TSAO CHEIN-HWA S
Abstract: BO979042 SCALING AERODYNAMIC COMPENSATION IN AN INK JET PRINTER In an ink jet printer, it is desirable to compensate the flight of the ink drops to correct for print errors caused by aerodynamic effects. The apparatus shown herein corrects the flight of ink drops for all aerodynamic effects, drop interactive and environmental. Correction for drop interactive effects can be accomplished in any of several well known ways. The additional correction for environmental effects is accomplished by scaling the drop interactive correction. The scale factor is first determined for static environmental conditions. Environmental conditions include the climate in which the printer operates and the specifications on the component parts of the ink jet printing assembly. The scale factor can be adjusted dynamically for changes in the environment. In particular, changes in air density of the environment are monitored and used to dynamically adjust the scale factor.
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公开(公告)号：CA1137535A
公开(公告)日：1982-12-14
申请号：CA343573
申请日：1980-01-14
Applicant: IBM
Inventor： TSAO CHEIN-HWA S
Abstract: INK DROP COMPENSATION BASED ON DYNAMIC, PRINT-DATA BLOCKS The invention relates to an ink jet printer and in particular to correcting the flight path of drops from the printer to reduce print position error on the print media. Compensation values can be stored and retrieved for use by the printer to correct the flight of a drop to the print media. The compensation values are based on the pattern of print data representing the drops in the ink stream with the drop being compensated. To reduce the number of variables that must be dealt with, one or more portions of the print data can be grouped into one or more blocks and each block treated as having a single effect on the drop being compensated. However, basing the compensation value on one predetermined treatment of print drops as having individual effects or as having individual effects in combination with one or more group effects on the drop being compensated does not produce the optimum print appearance for all combinations of print data. Disclosed herein is a method and apparatus for selecting one of a plurality of treatments of the print data based upon the pattern of print data representing drops in the ink stream. Depending on the BO978055 number of drops in the flight path with the drop being compensated, the drops may be treated as each having an individual effect, an individual effect by some drops and a single group effect by the remaining drops or an individual effect by some drops and group effects by multiple groups of the remaining drops. Also more storage space may be allotted for compensation values based on the combinations treated as multiple groups because these combinations produce the most visible print error. BO978055
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