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AssigneeCentral Glass Company, Limited
InventorsYoshio Mohri, Tsutomu Ikeda, Takashi Hiroishi, Kinzi Sano, Yasuhiro Yamamoto, Yuji Yamamoto, Ryoji Nakashima
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A method of producing a glazed ceramic substrate, which is useful for a hybrid integrated circuit or a thermal head of a thermal printer for instance, by applying a glass onto a major surface of a ceramic substrate, firing the substrate to form a molten glass layer on the substrate surface and cooling the fired substrate. To obtain the glazed ceramic substrate with high flatness despite the tendency of the substrate to warp due to difference in thermal expansion coefficient between the ceramic and the glass, a refractory base which supports the substrate during the firing and cooling steps is so shaped as to allow the substrate to deform during the firing step reversely to the expected warp at the cooling step, so that the warp at the cooling step is offset by the preceding deformation. For example, the upper surface of the base is shaped into a continuous and concave surface. As a modification, suitably shaped rib-like or pillar-like spacers are arranged on the top face of a flat base plate with intervals therebetween.
In a method of producing a glazed ceramic substrate having the steps of applying a glass onto a major surface of a plate-shaped ceramic substrate, firing the glass-applied substrate at a temperature above the melting temperature of the glass to thereby form a molten glass layer on the substrate, and cooling the fired substrate to allow the molten glass layer to turn into a solid coating layer, the glass-applied substrate being placed on a refractory base during the firing and cooling steps,
Dependencies are inferred from the claim text.