Thermal head driving system
AssigneeFuji Xerox Co., Ltd.
InventorsMasami Kurata, Toshiharu Inui
Life of this patent
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Abstract
A thermal recording apparatus operates to efficiently utilize a smaller capacity power supply by the provision of a capacitor in parallel with the power supply source. The capacitor is discharged during printing cycles and is recharged in the interval between the end of one line printing operation and the beginning of the next. This interval is increased in proportion to the percentage of black bits printed in a given line, such that the capacitor may be sufficiently charged and the power supply efficiently used.
Claims8
A thermal head driving system for a recording apparatus, comprising;
- a DC power source, charge and discharge capacitor means between said DC source and a thermal head for performing thermal recording operations in a line by line manner, said thermal recording taking place during the discharge of said capacitor means, said capacitor means being charged by said DC source to supply drive current to said thermal head, and means for varying the time during which said capacitor means is charged to correspond to the degree to which said capacitor will be discharged in recording a given line.
A thermal head driving system, comprising;
- a DC power source, capacitor means connected in parallel with said power source, means for determining the ratio of printable video signals from among a plurality of video signals for one printing line, and means for determining a charging time for said capacitor means in response to the magnitude of said ratio.
Dependencies are inferred from the claim text.