Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
November 18, 2008
0Patent Application Number
105047600
Date Filed
February 3, 2003
0Patent Citations Received
Patent Primary Examiner
Patent abstract
An electric lamp includes a lamp vessel which is transparent to visible light and accommodates a light source. The lamp vessel is covered with a combination of a light-absorbing medium and an optical interference film having layers of alternately layers of silicon dioxide and layers of a material with a comparatively high refractive index (e.g. ZrO2) . The reflection R of the interference film changes from 0.60≦R≦0.95 to 0.40≦R≦0.65 with a step ΔR in the range 0.2≦ΔR≦0.45, in a wavelength range 0.95×λtr≦λ≦1.2×λtr. In operation, the electric lamp emits colored light in the transmission mode and has a substantially color-neutral appearance in the off state.
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