Title:
BULB FILAMENT
Document Type and Number:
Japanese Patent JP2016119159
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a bulb filament which can be small-sized while securing a light flux and the lifetime, of which the lifetime can be prolonged while securing an outline dimension and the light flux and which is capable of improving the light flux while securing the outline dimension and the lifetime.SOLUTION: A filament wire 4 is formed by spirally winding a winding wire 3 of which the diameter is smaller than that of a core wire 2, around the core wire 2 in a predetermined pitch, and a coil-shaped bulb filament 1 is formed by spirally winding the filament wire 4 in a predetermined pitch.SELECTED DRAWING: Figure 3
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Inventors:
SATO ISAMU
INOUE MASAKAZU
INOUE MASAKAZU
Application Number:
JP2014256430A
Publication Date:
June 30, 2016
Filing Date:
December 18, 2014
Export Citation:
Assignee:
STANLEY ELECTRIC CO LTD
International Classes:
H01K1/14
Attorney, Agent or Firm:
Teruo Akimoto
Daisuke Yoshizawa
Daisuke Yoshizawa