Patent US5627426A successfully refreshed from Google Patents.
US5627426A
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US
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Lamp with IR reflecting film and light-scattering coating
Assignee: General Electric Co
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Filing: 1993-03-22
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Granted: 1997-05-06
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Expires: 2013-03-22
Abstract
Abstract Incandescent lamps or arc lamps having an infrared red reflecting multilayer optical interference filter on the outer surface of the vitreous or fused quartz lamp envelope enclosing the filament have a light-scattering coating applied over the filter to scatter light emitted by the lamp and thereby diffuse the filament image. The light-scattering coating consists of light-scattering particles, such as alumina, dispersed in a silica matrix. This coating is formed by applying to the filter a silicone solution in which is dispersed colloidal silica and light-scattering particles and pyrolyzing at high temperature to drive off the organic components and form the silica matrix.
Inventors
- 👤 Pamela K. Whitman
- 👤 Thomas G. Parham
- 👤 Thomas M. Sharda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/28; H01K1/32; H01K1/325; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/40
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
40 words
A light-transmissive article having at least one surface with at least a portion of said surface having a multilayer optical interference filter with a light-scattering coating comprising light-scattering particles in a vitreous substantially pure, silica binder disposed adjacent said filter.
Claim 2
Dependent Claim
40 words
A light-transmissive article having at least one surface with at least a portion of said surface having a multilayer optical interference filter with a light-scattering coating comprising light-scattering particles in a vitreous substantially pure, silica binder disposed adjacent said filter.
Claim 3
Dependent Claim
22 words
An article of claim 1 wherein the refractive index of said light-scattering particles is greater than the refractive index of said binder.
Claim 4
Dependent Claim
15 words
An article of claim 2 wherein said light-scattering particles are transparent to visible light radiation.
Claim 5
Dependent Claim
19 words
An article of claim 3 wherein the effective particle size of said light-scattering particles does not exceed 3 microns.
Claim 6
Dependent Claim
15 words
An article of claim 3 wherein said filter reflects infrared radiation and transmits visible light.
Claim 7
Dependent Claim
16 words
An article of claim 4 wherein said filter reflects infrared radiation and transmits visible light radiation.
Claim 8
Dependent Claim
17 words
An article of claim 6 wherein said filter is made of alternating layers of refractory metal oxide.
Claim 9
Dependent Claim
11 words
An article of claim 7 wherein said light-scattering particles comprise alumina.
Claim 10
Dependent Claim
47 words
A lamp comprising a light-transmissive envelope enclosing a source of IR and visible light radiation with a multilayer optical interference filter disposed adjacent said envelope which transmits visible light and a light-scattering coating comprising light-scattering particles in a vitreous substantially pure, silica binder disposed adjacent said filter.
Claim 11
Dependent Claim
47 words
A lamp comprising a light-transmissive envelope enclosing a source of IR and visible light radiation with a multilayer optical interference filter disposed adjacent said envelope which transmits visible light and a light-scattering coating comprising light-scattering particles in a vitreous substantially pure, silica binder disposed adjacent said filter.
Claim 12
Dependent Claim
23 words
A lamp according to claim 9 wherein said light-scattering particles have a refractive index different from the refractive index of said silica binder.
Claim 13
Dependent Claim
15 words
A lamp according to claim 10 wherein said light-scattering particles are transparent to visible light.
Claim 14
Dependent Claim
18 words
A lamp according to claim 11 wherein said filter is made of alternating layers of refractory metal oxide.
Claim 15
Dependent Claim
20 words
A lamp according to claim 12 wherein said light-scattering particles have an effective particle diameter no greater than 3 microns.
Claim 16
Dependent Claim
11 words
A lamp according to claim 13 wherein said filter reflects IR.
Claim 17
Dependent Claim
13 words
A lamp according to claim 14 wherein said light source is a filament.
Claim 18
Dependent Claim
14 words
A lamp according to claim 14 wherein said light source is an arc discharge.
Claim 19
Dependent Claim
12 words
A lamp according to claim 14 wherein said light-scattering particles comprise alumina.
Claim 20
Dependent Claim
104 words
A lamp comprising a light-transmissive, vitreous envelope enclosing a source of IR and visible light radiation with a multilayer optical interference filter disposed adjacent said envelope which transmits visible light and with a light-scattering coating comprising light-scattering particles in a vitreous substantially pure, silica binder disposed adjacent said filter, wherein said coating is formed by dispersing particles of light-scattering material in a dispersion of colloidal silica in a liquid silicone solution which is disposed adjacent said filter and heated at elevated temperature to drive out the organic component of said silicone and convert said silicone and said colloidal silica to a vitreous, silica binder.
Claim 21
Dependent Claim
104 words
A lamp comprising a light-transmissive, vitreous envelope enclosing a source of IR and visible light radiation with a multilayer optical interference filter disposed adjacent said envelope which transmits visible light and with a light-scattering coating comprising light-scattering particles in a vitreous substantially pure, silica binder disposed adjacent said filter, wherein said coating is formed by dispersing particles of light-scattering material in a dispersion of colloidal silica in a liquid silicone solution which is disposed adjacent said filter and heated at elevated temperature to drive out the organic component of said silicone and convert said silicone and said colloidal silica to a vitreous, silica binder.
References Cited (Backward Citations)
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| 7.5 Years (Year 8) | 2004-05-05 | 2004-11-04 | 2005-05-06 | $3760.00 | Window Closed / Lapsed |
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