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US 2009/0267480 A1Published application
High-pressure discharge lamp and lighting equipment
AssigneeToshiba Lighting & Technology Corporation
InventorsAkira Kawakatsu, Kazuyoshi Okamura
Life of this patent
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Abstract
A high-pressure discharge lamp includes a luminous tube, a translucent protective tube disposed to cover the luminous tube, and a light-cutting layer formed on an outer or inner surface of the protective Lube and includes, as a main component, metal oxide particles which absorb light having a wavelength no greater than 600 nm and allow light having a wavelength of greater than 600 nm to permeate, the light-cutting layer having optical properties that a cut ratio of light having a wavelength of 450 nm is confined to 20-50%.
Claims10
A high-pressure discharge lamp comprising:
- a luminous tube;
- a translucent protective tube disposed to cover the luminous tube;
- and
- a light-cutting layer formed on an outer or inner surface of the protective tube and comprising, as a main component, metal oxide particles which absorb light having a wavelength no greater than 600 nm and allow light having a wavelength of greater than 600 nm to permeate, the light-cutting layer having optical properties that a cutting ratio of light having a wavelength of 450 nm is confined to 20-50%.
1 more element
Dependencies are inferred from the claim text.