Ink drop compensation based on print-data blocks

Details Ink drop compensation based on print-data blocks Ink drop compensation based on print-data blocks

1979-03-26

1980-10-21

Hartary, Joseph W.

Recorders

Record receiver deforming

G01D 1518

Patent

active

042297494

ABSTRACT:
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. It has been found that drops as far as 30 drop positions ahead of a drop in the ink stream can have an effect on the flight path of that drop to the print media. Using a memory to store 2.sup.30 compensation values to correct the flight of the drop for all possible combinations of drop patterns in the ink stream is not practical. Disclosed herein is a method and apparatus for using a smaller number of compensation values to correct the flight path for all possible combinations. This is accomplished by grouping the drops remote in position from the drop being compensated into blocks of drops and treating the entire block of drops as contributing one effect on the flight of the drop. Accordingly, drops close to the compensated drop are treated as having an individual effect on the flight path while drops remote from the compensated drop are grouped into one of more blocks and each block is treated as having a single effect on the compensated drop.

REFERENCES:
patent: 3631511 (1971-12-01), Keur
patent: 3789422 (1974-01-01), Haskell
patent: 3828354 (1974-08-01), Hilton
patent: 3946399 (1976-03-01), Zaretsky
patent: 4032924 (1977-06-01), Takano
Bengds et al., Ink Printer . . . for Charge Compensation; IBM Tech. Disc. Bulletin, vol. 16, No. 11, Apr., 1974, pp. 3550-3552.
Nguyen, N. N., Storing and Computing . . . in a High-Speed Ink Jet Printer, IBM Tech. Disc. Bulletin, vol. 21, No. 4, Sep., 1978, pp. 1540-1542.

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