EP0442704A2
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EP
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Metal halide lamp and method of making the same
Assignee: Panasonic Holdings Corp
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Filing: 1991-02-12
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Granted: —
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Expires: 2011-02-12
Abstract
Abstract A metal halide lamp is made by coating the inner surface of a luminous tube made of quartz glass with hafnium oxide, uranium oxide, hafnium oxide partially stabilized with yttrium oxide or uranium oxide partially stabilized with yttrium oxide by introducing therein a vapour of metal chelate containing hafnium (Hf), uranium (U) or yttrium (Y) and oxygen (O₂), nitrogen suboxide (N₂O) or ozone (O₃) as a reaction gas, and sealing the inside of the luminous tube with a halogenide of alkali metal, mercury and argon.
Inventors
- 👤 Masaki Aoki
- 👤 Hideaki Omura
- 👤 Toshiaki Ogura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 00:53
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J61/00; H01J61/02; H01J61/30; H01J61/35
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
41 words
A metal halide lamp having formed on an inner surface of a luminous tube a thin film comprising any one of hafnium oxide (HfO₂), uranium oxide (UO₂), HfO₂ partially stabilized with yttrium oxide (Y₂O₃) and UO₂ partially stabilized with yttrium oxide.
Claim 2
Independent Claim
105 words
A method of making a metal halide lamp which comprises introducing in a pipe made of quartz glass which is subjected to reduced pressure of 10⁻ 1 - 10⁻ 4 Torr a vapour of metal chelate containing any one or two elements of hafnium (Hf), uranium (U) and yttrium (Y) and oxygen (O₂), nitrogen suboxide (N₂O) or ozone (O₂) as a reaction gas to coat an inner surface of a quartz glass tube with any one of HfO₂, UO₂, HfO₂ partially stabilized with Y₂O₃ and UO₂ partially stabilized with Y₂O₃, followed by sealing inside said tube with a halogenide of alkali metal, mercury and argon.
Claim 3
Independent Claim
120 words
A method of making a metal halide lamp which comprises causing a high frequency (RF) discharge in the inside of a quartz glass tube which is subjected to reduced pressure of 5 X 10⁻ 1 - 3 X 10⁻ 3 Torr, introducing therein a vapour of metal chelate containing any one or two elements of hafnium (Hf), uranium (U) and yttrium (Y) and oxygen (O₂), nitrogen suboxide (N₂O) or ozone (O₂) as a reaction gas to coat an inner surface of the quartz glass tube with any one of HfO₂, UO₂, HfO₂ partially stabilized with Y₂O₃ and UO₂ partially stabilized with Y₂O₃, followed by sealing inside the quartz glass tube with a halogenide of alkali metal, mercury and argon (Ar).
Claim 4
Independent Claim
120 words
A method of making a metal halide lamp which comprises causing a discharge using an electron cyclotron (ECR) in the inside of a quartz glass tube which is subjected to reduced pressure of 5 X 10⁻ 3 - 10⁻ 4 Torr, introducing therein a vapour of metal chelate containing any one or two elements of hafnium (Hf), uranium (U) and yttrium (Y) and oxygen (O₂), nitrogen suboxide (N₂O) or ozone (O₂) as a reaction gas to coat an inner surface of the quartz glass tube with any one of HfO₂, UO₂, HfO₂ partially stabilized with Y₂O₃ and UO₂ partially stabilized with Y₂O₃, followed by sealing inside the quartz glass tube with a halogenide of alkali metal, mercury and argon (Ar).
Claim 5
Independent Claim
55 words
A method of making a metal halide lamp according to any one of Claims 2 to 4, wherein the metal chelate is hafnium acetyl acetone [Hf(C₅H₇O₂)₄], hafnium dipivaloylmethane [Hf (C₁₁H₁₉O₂)₄] hafnium hexafluoroacetylacetone [Hf(C₅HF₆O₂)₄], uranium acetyl acetone [U(C₅H₇O₂)₄], uranium dipivaloylmethane [U(C₁₁H₁₉O₂)₄], uranium hexafluoroacetylacetone [U (C₅HF₆O₂)₄], yttrium acetyl acetone [Y(C₅H₇O₂)₃], yttrium dipivaloylmethane [Y(C₁₁H₁₉O₂)₃], or yttrium hexafluoroacetylacetone [Y(C₅HF₆O₂)₃].
References Cited (Backward Citations)
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