Thermal recording method, thermal recording medium used in the m

Details Thermal recording method, thermal recording medium used in the m Thermal recording method, thermal recording medium used in the m

1990-04-27

1991-12-17

Fuller, Benjamin R.

Recorders

Record receivers and/or driving means therefor

Laminated, impregnated, or coated bases

346 76R, G01D 900, B41M 528

Patent

active

050737872

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to thermal recording, and more specifically, to a thermal recording method using physical changes and enabling stable recording while causing only minimal changes with the passing of time, a thermal recording medium used in the method and a method for producing said recording medium.
This invention can be effectively applied to printing figures and the like corresponding to the contents of magnetic recording in a prepaid magnetic card such as a telephone card to enable the magnetically recorded contents to be macroscopically seen.
Conventionally, there are two methods for recording information on a recording paper by heating the heating element of a thermal head at desired timing according to recording signals while scanning said thermal head over the recording paper. These methods consist of a heat transcription method in which a desired pattern is transcribed on a normal recording paper by heating and melting the ink of a heat sensitive ink ribbon which is interposed between a thermal head and the recording paper, and a thermal method in which a thermal recording paper is colored in a desired pattern.
Since ink is not applied to a recording paper and the heat sensitive layer of the recording paper itself is colored in the thermal method, this method is advantageous because the printed record is not affected almost entirely even when external frictional force is applied to the recording paper after recording. This method is advantageous also because no ink ribbons are necessary.
However, since a layer containing a heat sensitive color former is used as the heat sensitive layer of a recording paper used in the conventional thermal method and said heat sensitive layer is colored due to chemical changes of said color former during heating, sufficiently good quality of the printed record is difficultly obtained because the degree of coloring may vary depending on environmental conditions, and also the stability of recording is not sufficient yet.


SUMMARY OF THE INVENTION

In view of the above problems of the prior art, this invention aims to provide a novel thermal recording method enabling good quality of the printed record and good stability of recording, a novel thermal recording medium used in said method and a method for producing said recording medium.
According to this invention, the above objects are achieved by a thermal recording medium which has a metallic thin layer, a heat sensitive layer formed on said metallic thin layer and a contrast layer formed on either said heat sensitive layer or the above metallic thin layer and visually contrasting with the above metallic thin layer.
According to this invention, the above objects are achieved by a method for producing a thermal recording medium which is characterized by using a material containing minute particles to form a roughed heat sensitive or contrast layer before the formation of a metallic thin layer and depositing it on the roughed heat sensitive or contrast layer.
According to this invention, the above objects are achieved by a thermal recording method which is characterized by heating the heat sensitive and the metallic thin layers of the above thermal recording medium of this invention in a desired pattern to melt the heated areas of said metallic thin layer and disperse the molten metal as fine particles into the heat sensitive layer touching said metallic thin layer thereby destroying it in the above desired pattern.


BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1, 4 and 5 are rough cross-sectional views of the main parts of thermal recording media of this invention.
FIGS. 2(a).about.(e) and FIGS. 7(a).about.(d) indicate the production processes for thermal recording media of this invention.
FIG. 3 is a rough cross-sectional view for explaining a method for recording in the thermal recording medium of this invention.
FIGS. 6(a) and (b) are plan views for explaining the formation of indications produced by writing visible patterns in the thermal recording medium of this invention.


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