Incandescent bulb and light source apparatus

An object of this invention is to provide an incandescent bulb which has sufficiently high brightness and produces a god light distribution on a surface irradiated by the light, and a light source apparatus having high usage efficiency of the light radiated from the incandescent light bulb. The inca...

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Bibliographic Details
Main Authors MURAKI SHINOBU, YAMAMIZU YUTAKA, ONO SATOSHI
Format Patent
LanguageEnglish
Published 23.02.2012
Subjects
BASIC ELECTRIC ELEMENTS
BLASTING
ELECTRIC INCANDESCENT LAMPS
ELECTRICITY
FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF
HEATING
LIGHTING
MECHANICAL ENGINEERING
STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR
WEAPONS
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Summary:An object of this invention is to provide an incandescent bulb which has sufficiently high brightness and produces a god light distribution on a surface irradiated by the light, and a light source apparatus having high usage efficiency of the light radiated from the incandescent light bulb. The incandescent light bulb is provided therein with a filament that includes a plurality of filament segments made from a single coil formed by winding one wire material that respectively extend along an axial direction of the bulb and are arranged in parallel to form a flat surface, wherein a pitch of the plurality of filament segments located at a central part of the bulb is smaller than a pitch of a plurality of filament segments located at both side portions.
Bibliography:Application Number: US201013138949