Pulse width modulation method for a parallel input print head

Details Pulse width modulation method for a parallel input print head Pulse width modulation method for a parallel input print head

1995-04-20

1998-04-14

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Having driving circuitry for recording means

347183, B41J 235

Patent

active

057398380

ABSTRACT:
An apparatus and method for generating all of the print levels represented by an image data signal using a parallel input print head which has an input data bus which is narrower than the image data signal involves processing and printing image data multiple times. Each time the image data is processed, it is reduced from its original width down to the width which the print head can accept. The process includes the steps of determining the minimum number of times L.sub.min that the print head must be loaded to accomplish printing using the full width of the image data signal; processing the image data L times, where L.gtoreq.L.sub.min, to produce L output signals that (1) are no wider than the width of the input data bus and (2) have values such that the sum of the values of the L output signals equals the value of the input data signal; and using the L output signals to drive the print head.

REFERENCES:
patent: 4621271 (1986-11-01), Brownstein
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patent: 4819008 (1989-04-01), Nagato et al.
patent: 4951152 (1990-08-01), Suzuki et al.
patent: 4994822 (1991-02-01), Caine
patent: 5604527 (1997-02-01), Ng et al.

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