Incandescent bulb, filament, and method for manufacturing filament
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United States of America Patent
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Feb 2, 2016
Grant Date -
Oct 2, 2014
app pub date -
Oct 24, 2012
filing date -
Oct 27, 2011
priority date (Note) -
In Force
status (Latency Note)
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Abstract
An object of the present invention is to provide a filament showing improved conversion efficiency with a simple configuration. According to the present invention, surface of a filament material processed into a predetermined shape is processed into a mirror surface by mechanical polishing, and surface roughness (center line average roughness Ra) thereof is thereby made to be 1 μm or smaller. Reflectance of the filament can be thereby improved, and emissivity of the filament for lights of the infrared wavelength region can be suppressed.
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