| 摘要 |
Apparatus for determining inter-pen offsets in a multiple pen ink jet printer including a piezoelectric ink drop detector having a piezoelectric detector film having one or more openings formed therein. A carriage position sensor indicates the position of the carriage at the time a first ink drop is detected from each of the ink jet pens as the pens are scanned across an opening, whereby the sensed positions for the respective pens provides information indicative of inter-pen offset in the scan direction. For determination of inter-pen offset in the media scan direction, the piezoelectric film includes a plurality of openings, whereby the detect/no detect patterns for each of the pens provides information indicative of the inter-pen offsets.
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