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Thermal head driving/control apparatus

  • US 4,587,530 A
  • Filed: 09/13/1983
  • Issued: 05/06/1986
  • Est. Priority Date: 09/13/1982
  • Status: Expired due to Fees
First Claim
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1. In a recording device performing picture data recording one line at a time using a thermal head, a thermal head driving/control apparatus comprising:

  • a picture data memory for storing picture signals each corresponding to one of a plurality of lines which make up a recorded image, each picture signal corresponding to an information bit, a plurality of which make up a line;

    a correction data memory for storing picture signals corresponding to several of a plurality of lines which make up a recorded image, the most recently provided line successively displacing the least recently provided line in said correction data memory;

    a correction data designating circuit for producing address information signals for said correction data memory such that picture signals corresponding to information bits located in the vicinity of a designated reference bit are output by said correction data memory;

    a data calculation circuit for counting the number of picture signals addressed by said correction data designating circuit and provided from said correction data memory which contain information commanding printing of a black dot for producing a correction signal which has one of two states depending on the number of picture signals counted by said data calculation circuit which command printing of a black dot;

    a rearranging circuit for interspersing picture signals from said picture data memory with corresponding correction signals provided from said data calculation circuit;

    a data buffer for storing picture signals alternating with correction signals as provided in sequence from said rearranging circuit; and

    a thermal head including a plurality of heating elements for printing a recorded image by activating heating elements thereof in response to picture and correction data signals provided by said data buffer;

    means for producing address information signals corresponding to a predetermined first number of bits on either side of said reference bit in the same line as said reference bit and bits of similar line position as said reference bit and said predetermined first number of bits on said either side of said reference bit in a second predetermined number of successive lines previous to said line containing said reference bit.

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