| 摘要 |
A thermosensitive color recording material is provided having cyan, magenta, and yellow thermosensitive coloring layers formed on a supporting material in this order. As a thermosensitive coloring layer is positioned deeper within the recording material, which corresponds to a lower heat sensitivity thereof, a larger heat energy for coloring is required. The high density area of the yellow thermosensitive color layer overlaps with the low density area of the magenta thermosensitive coloring layer, and the high density area of the magenta thermosensitive color layer overlaps with the low density area of the cyan thermosensitive coloring layer. In coloring the yellow thermosensitive coloring layer, it is necessary to prevent the underlying magenta thermosensitive coloring layer from developing color. To this end, a pulse train including one bias pulse and a plurality of image pulses is divided into a plurality of subsidiary pulse trains, in order to generate a heat energy lower than the coloring heat energy necessary for obtaining a desired density. The subsidiary pulse trains are supplied to the thermal head at a slight time delay interval or in a manner which allows a sequential frame recording. Likewise, the thermal recording of the magenta thermosensitive coloring layer is performed for a plurality of times. |
