MANUFACTURE OF FLUORESCENT LAMP

摘要

PURPOSE:To prevent failure to lighting and a decrease in a luminous lamp flux by coating a bulb internal surface with a phosphor containing a caking agent and making a hot wind of 300 deg.C to 450 deg.C blow in the bulb so as to burn up the caking agent. CONSTITUTION:In sintering of a glass bulb 1 whose internal surface is coated with a phosphor containing a caking agent, a hot wind 4 of 300 deg.C to 450 deg.C generated in a device 3 is made to advance rotationally on a rod 5 and to blow from an opening of one end of the bulb 1 into the inside of the bulb so that the phosphor is uniformly baked by a gas burner 2 so as to burn up the caking agent. Resultingly, a phosphor film is formed on the internal surface of the bulb 1. The amount of impure gases remaining in the bulb is much decreased by this method so that failure to lighting and a decrease in a luminous lamp flux can be prevented.