Manufacture of chipless fluorescent lamp and device therefor

Abstract

Abstract PURPOSE:To manufacture a chipless fluorescent lamp in a simple process very easily, and to improve the yield, by heating a holding member with an induction heating in a evacuated outer tube, and melting and sealing a luminous tube and a bead stem held by the holding member. CONSTITUTION:A bead stem 11 is loaded on the center of a recess 61 of a holding member 6 in the condition that two lead wires 12 extended outward from the bead stem 11 are inserted in small holes 62 respectively, and one end 10a of a luminous tube 10 of a small size fluorescent lamp is inserted to a recess 61. After that, an outer tube 2 made of quartz is inserted airtight to a holding table 1, and the inside of the outer tube 2 is evacuated by operated by operating a vacuum pump. Then a current is applied to a high-frequency oscillator to let the high-frequency current flow in a induction coil 7. As a result, an excessive current is induced at the surface of the holding member 6 to heat the holding member 6. When the current is continued to apply further, the temperature of the holding member 6 rises up to 1600 deg.C or higher, and one end 10a of the luminous tube 10 and the bead stem 11 are melted and sealed up. In such a way, a chipless fluorescent lamp can be manufactured in a simple process and in a very easy way.

Inventors

• 👤 Toru Nishikubo
• 👤 亨 西久保
• 👤 Osamu Inoue
• 👤 修 井上
• 👤 Kazuhiro Adachi
• 👤 安達　和浩

Bibliographic Details