Broad spectrum reflective coating for an electric lamp
First Claim
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1. An interference coating for reflecting both visible light and infrared radiation comprising:
- a dichroic structure including a plurality of layers of a material having a low index of refraction, and a plurality of layers of a material having a high index of refraction, the coating having an average spectral high reflectance of at least 80% for wavelengths in the visible light section of the electromagnetic spectrum and of at least 50% for wavelengths in a portion of the infrared section of the electromagnetic spectrum at least 150 nm wide.
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Abstract
An interference coating (22) for reflecting both visible light and a portion of the region of the infrared spectrum is disclosed. The coating includes a dichroic structure of a plurality of layers of a material having a low index of refraction and a plurality of layers of a material having a high index of refraction. The coating has an average spectral high reflectance of at least 80% for wavelengths in the visible light section of the electromagnetic spectrum and of at least 50% for wavelengths in a portion of the infrared section of the electromagnetic spectrum at least 150 nm wide.
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Citations
20 Claims
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1. An interference coating for reflecting both visible light and infrared radiation comprising:
a dichroic structure including a plurality of layers of a material having a low index of refraction, and a plurality of layers of a material having a high index of refraction, the coating having an average spectral high reflectance of at least 80% for wavelengths in the visible light section of the electromagnetic spectrum and of at least 50% for wavelengths in a portion of the infrared section of the electromagnetic spectrum at least 150 nm wide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An interference coating for reflecting both visible light and infrared radiation comprising:
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a dichroic structure including a plurality of alternating layers of an oxide of silicon and an oxide selected from the group consisting of titanium, tantalum, niobium, hafnium and combinations thereof, the coating having an average spectral high reflectance of at least 80% for wavelengths of from about 400 nm to about 800 nm and of at least 50% for wavelengths in a portion at least 150 nm wide of the electromagnetic spectrum beyond a wavelength of about 800 nm at a normal angle of incidence. - View Dependent Claims (12, 13, 14, 15, 16)
said average spectral high reflectance from about 400 nm to about 800 nm is at least 90%; and
said average spectral high reflectance for wavelengths in said portion of the electromagnetic spectrum beyond about 800 nm is at least 60% from about 800 nm to about 1,500 nm.
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17. An electric lamp, comprising:
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a reflector for reflecting both visible light and infrared radiation, including a substrate; and
at least a portion of said substrate coated with a dichroic structure including a plurality of layers, said coating having an average spectral high reflectance of at least 80% for wavelengths in the visible light section of the electromagnetic spectrum and of at least 50% for wavelengths in a portion of the infrared section of the electromagnetic spectrum at least 150 nm wide. - View Dependent Claims (18, 19, 20)
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Specification