Printing head system

Details Printing head system Printing head system

1987-09-11

1989-05-30

Goldberg, E. A.

Recorders

Thermal recording

346107R, 346160, 346154, G01D 1510

Patent

active

048355496

ABSTRACT:
A printing head applicable to a printer widely used as an output device of a facsimile, a computer, or the like having a printing element for generating light or heat to contribute to a printing operation and a driving circuit for supplying the printing element with a controlled energy to drive the printing element. The driving circuit is cons=tituted from a shift register for temporarily storing drive data of the printing element including, for example, a light emitting diode (LED) array to transfer the drive data to the printing element side at a fixed period of time, a storage section including plural memories for storing in advance correction data corresponding to output characteristics of plural printing elements such as LED printing elements, a selection circuit for transmitting a correction instruction output based on the drive data delivered from the shift register and selection data inputted from a selection wiring, and a drive control circuit including, for example, a current or voltage amplifying circuit for supplying the printing element with an appropriate output energy, namely, an output current value or an output voltage value so as to control an output characteristic of each of the individual printing elements based on the three data including the correction data fed via the storage section, image data supplied via an image input line, and an energy output data of, for example, a light emission or a heat radiation delivered from an energy input line. Without using a time factor for controlling the output of the printing element, a control is achieved to attain a uniform output energy from each of the individual printing element constituting the printing element by use of an energy factor such as a current and a voltage, thereby preventing an undesirable printout spot associated with the overall printing element.

REFERENCES:
patent: 4455562 (1984-06-01), Dolan et al.
patent: 4596995 (1986-06-01), Yamaka et al.

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