Recording apparatus having a print head drive apparatus with an

Details Recording apparatus having a print head drive apparatus with an Recording apparatus having a print head drive apparatus with an

1994-07-21

1996-08-06

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Density control

347211, B41J 236, B41J 2375

Patent

active

055438288

ABSTRACT:
A recording apparatus having a print head control apparatus containing an IC drive control circuit utilizes at least two shift registers having N single bit registers with respective data input terminals sequentially switched to receive print data wherein, at any one print cycle, one shift register is storage for current print data and the other shift register is storage for past print data so that, on the succeeding print cycle, the latter shift register receives new print data and the former shift register becomes the holder of past print data. When one of the shift registers provides output for the current print data to the thermal print head drivers, the other shift register is employed for referencing the past print data, i.e., comparing current and past print data. Thus, the function of shift registers are sequentially switched to control the drive data output to the thermal elements of the print head based on past print data history. Logical circuitry is employed comprising gate circuits for referencing or comparing the current print data with past data history relative to each individual thermal element of a plurality of N thermal elements. At least first and second strobe signals are provided having respectively first and second pulse widths which may be individually or collectively applied to each respective individual thermal element for application of current print data based upon its past print data history over one or more preceding print cycles.

REFERENCES:
patent: 4364063 (1982-12-01), Anno et al.
patent: 4912485 (1990-03-01), Minowa

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