The thermal head which uses the phosphorus acid type glass and the phosphorus acid type glass

摘要

Topic The former silicate type glass coefficient of thermal conductivity was large, the thermal head could not assure electric power consumption conversion low.Solutions The mol % with, P₂ O₅ 50 - 68%, CeO₂ 15 - 39%, B₂ O₃ 2 - 7%, 0.2 - 0.5% to include PR₆ O_11, phosphorus acid type glass, or P₂ O_{5 where the} mol ratio of P₂ O₅ for CeO₂ satisfies the relationship of 1 P2O5/CeO24 50 - 65%, CeO₂ 5 - 15%, B₂ O₃ 3 - 8%, Al₂ O₃ 0 - 10%, BaO to include 0 - 9% and PR₆ O₁₁, the mol ratio of P₂ O₅ for CeO₂Because the phosphorus acid type glass which satisfies the relationship of 4 P2O5/CeO2 coefficient of thermal conductivity is small, it can assure electric power consumption conversion low by using for the glaze layer of the thermal head. In addition, because coefficient of thermal expansion is equal to the ceramic baseplate, exfoliation of the ceramic baseplate is difficult to happen, in heat resistance is superior. Selective figure Figure 1