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US 4,908,055 AGranted
Method of manufacturing thereof fluorescent lamp
AssigneeKabushiki Kaisha Toshiba
InventorsAkitoshi Komiya, Taketo Kamei
Life of this patent
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Abstract
A manufacturing method of a fluorescent lamp having a bent discharge path, which comprises the steps of press-molding a straight glass tube, after heating and softening it, into a bulb having a bent discharge path, while blowing a pressurized gas into the discharge path. A fluorescent lamp having a U-shaped discharge path which is integrally connected through a narrow plate. A slit is formed at least in a portion of the narrow plate adjacent to a sealing portion.
Claims6
A manufacturing method of a bulb for a fluorescent lamp comprising the steps of:
- heating and softening a straight glass tube having two ends where at least one of said two ends is open, and
- molding said straight glass tube into a bulb of predetermined shape, having a discharging path with two ends, said molding step including the following steps:
- (i) placing said straight glass tube into a press mold having first and second press mold sides, each of said press mold sides having molding surfaces corresponding to a predetermined shape of said bulb, including opening portions for mounting electrodes,
- (ii) pressing the first and second press mold sides together so as to collapse in a diametrical direction said tube from opposite sides of the tube, and
- (iii) injecting a pressurized gas into said mold to form said bulb by introducing said gas at said open end of said glass tube,
- wherein the pressing step and the injecting step cause the entire outer wall of said tube to be surrounded and deformed by said press mold and cause a bridging portion connecting adjacent sides of said discharge path to be formed.
3 more elements
Dependencies are inferred from the claim text.