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Is-enthalpic control of a thermal printing head

  • US 5,237,338 A
  • Filed: 08/05/1991
  • Issued: 08/17/1993
  • Est. Priority Date: 08/05/1991
  • Status: Expired due to Fees
First Claim
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1. A thermal printing device having is-enthalpic control comprising:

  • a thermal printing head energizable by a selective flow of electrical energy to generate images on a responsive imaging material;

    a heat transfer area associated with said head and disposed to effect transfer of heat generated by said head to a fluid heat transfer medium;

    controllable moving means for moving said medium at a controllable flow rate to flow across said area to remove therefrom heat generated by said head;

    measuring means for measuring a flow rate of electrical energy to said head;

    determining means for determining a flow rate of heat energy removed from said head by said medium that flows across said area; and

    control means for controlling said moving means, in dependence upon said measured flow rate of electrical energy to said head, and said determined flow rate of heat energy removed from said head by said medium, to adjust said controllable flow rate of said medium so that a net energy in said head remains substantially constant.

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