Double-filament incandescent lamp for automotive vehicle front lighting
US-9966246-B2 · May 8, 2018 · US
Incandescent bulb, filament, and method for manufacturing filament
US9252006B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9252006-B2 |
| Application number | US-201214354557-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 24, 2012 |
| Priority date | Oct 27, 2011 |
| Publication date | Feb 2, 2016 |
| Grant date | Feb 2, 2016 |
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Abstract
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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.
First claim
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The invention claimed is: 1. An incandescent light bulb comprising: a translucent gastight container, a filament disposed in the translucent gastight container, and a lead wire for supplying an electric current to the filament, wherein the filament is processed so as to have a surface roughness (center line average roughness Ra) of 1 μm or smaller. 2. A filament processed to have a surface roughness (center line average roughness Ra) of 1 μm or smaller. 3. The incandescent light bulb according to claim 1 , wherein reflectance of the filament for lights in an infrared wavelength region of a wavelength of 3 μm or longer is 0.9 or larger, and reflectance of the filament for lights in a visible light wavelength region of a wavelength of 0.7 μm or shorter is 0.6 or smaller. 4. A heater comprising the filament according to claim 2 .
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- What does patent US9252006B2 cover?
- 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. R…
- Who is the assignee on this patent?
- Stanley Electric Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01K1/02. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Feb 02 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).