Thermal head recording device

Details Thermal head recording device Thermal head recording device

H - Electricity

04

N

314/41

H04N 1/23 (2006.01) H04N 1/40 (2006.01)

Patent

CA 1193309

- 1 - Abstract: A thermal head recording device includes a thermal head adapted to print a sheet, a source of information alternately producing coded image signal having an arbitrary length and coded EOL signal, decoder for decoding the coded image signal and coded EOL signal into image signal having a predetermined length and EOL signal, respectively. The image signal is transmitted to the thermal head in response to a driving pulse produced from driving pulse generator. The driving pulse generator includes a measuring circuit for measuring length of the coded image signal, a circuit for detecting temperature of the thermal head, a circuit for determining pulse duration based on both the length of the coded image signal measured by the measuring circuit and the temperature of the thermal head, a circuit for producing at least one reference pulse having a predetermined frequency, and a circuit for producing a driving pulse having a frequency determined by the reference pulse producing circuit and a pulse duration determined by the determining circuit.

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