JP2990637B

PURPOSE:To prevent the occurrence of pit so as to form a stable thick-film electrode thereby improving the quality of a thick-film electrode by applying silver paste including glass flit on both main surfaces of the obverse and reverse of a piezoelectric ceramic substrate, and baking it in a high-pressure baking furnace after drying so as to form a thick-film electrode. CONSTITUTION:Electrode materials including glass flit ingredients in silver paste are applied all over both the main surfaces of the obverse and reverse of a ceramic substrate and is dried. After that, the ceramic substrate is sent to a baking furnace at high pressure, wherein it is baked to form a thick-film electrode 2. If it becomes that the bubbles can not expand after cooling, the pressure is lowered. Hereby, the bubbles in the thick-film electrode can not expand, being suppressed by glass, so the bubbles cease to burst, and the occurrence of pit can be prevented. Accordingly, a stable thick-film electrode can be made, and the quality of the thick-film electrode can be improved.