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US 6,611,101 B1Granted
Electric light bulb and coating method of electric light bulb
AssigneeKoito Manufacturing Co., Ltd.
InventorsToshiaki Mitobe, Koichi Nakamura
Life of this patent
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Abstract
An electric light bulb that minimizes peeling of the coating, suppresses reduction of the number of light fluxes, and is easy to manufacture is described. The electric light bulb 1 has a glass bulb 2 having a straight tube 2a and a leading edge portion 2b that is continuous with the straight tube. A blue coating 5 is applied onto the straight tube, and a white or silver shield coating 6 is applied onto the leading end portion 2b.
Claims1
An electric light bulb having a substantially cylindrical straight tube portion continuous with a leading end portion comprising:
- a blue coating applied onto the straight tube;
- and
- a white or silver shield coating applied onto the leading end position;
- wherein the straight tube contains only the blue coating, the leading end portion contains only the shield coating and, wherein the shield coating overlaps the blue coating at a boundary portion between the blue coating and the shield coating.
1 more element
Dependencies are inferred from the claim text.