| 摘要 |
PURPOSE:To enable uniform heat generation, by setting the width of a heat generating resistor provided on an insulating base to be sufficiently large, uniformizing the thickness of a central part of the resistor, opposing electrodes to each other over a length shorter than the width of the resistor, and determining the dot size of an energization region by the length of the opposed parts of the electrodes. CONSTITUTION:A thick film thermal bead, having a recording density of 8 dots/mm, comprises a glass heat-accumulating layer 2 on a ceramic substrate 1, and a common electrode 13 and discrete electrodes 14 provided on the layer 2, with an organogold paste being used as a material so as to ensure favorable contact of the head with a recording paper. The length l of opposed parts of the electrodes 13, 14 is set to be shorter than that in a conventional system so that the length coincides with the size of s print dot in an auxiliary scanning direction. A single heat generating resistor 15 is provided, with a central part of the resistor being located at the opposed parts of the electrodes and the width L of the resistor being sufficiently greater than the length l of the opposed parts of the electrodes, end an abrasion-resistant layer 16 is provided thereon by using a glass paste. |
