EP0327346A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Amalgam suitable for use in a low mercury vapor pressure discharge lamp
Assignee: Toshiba Corp
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Filing: 1989-02-01
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Granted: —
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Expires: 2009-02-01
Abstract
Abstract An amalgam has a base metal including bismuth in an amount selected from the range between about 45 wt% and 65 wt%, and lead in an amount selected from the range between about 35 wt% and 55 wt%. The amalgam also includes mercury the amount of which is selected from the range between about 1 wt% and 12 wt% of the total amount of the amalgam. Such amalgam is sealed in a low mercury vapor pressure discharge lamp which operated at a medium tube surface temperature to achieve a stable mercury vapor pressure over an extended amalgam temperature range.
Inventors
- 👤 Takashi C/O Patent Division Yorifuji
- 👤 Seiko C/O Patent Division Komoda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 14:02
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/24; H01J61/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
63 words
An amalgam comprising a base metal including bismuth in an amount selected from the range between about 45 wt% and 65 wt%, and lead in an amount selected from the range between about 35 wt% and 55 wt%; and mercury the amount of which is selected from the range between about 1 wt% and 12 wt% of the total amount of the amalgam.
Claim 2
Dependent Claim
63 words
An amalgam comprising a base metal including bismuth in an amount selected from the range between about 45 wt% and 65 wt%, and lead in an amount selected from the range between about 35 wt% and 55 wt%; and mercury the amount of which is selected from the range between about 1 wt% and 12 wt% of the total amount of the amalgam.
Claim 3
Dependent Claim
45 words
An amalgam as claimed in claim 1, in which the lead content of the base metal is selected from the range between about 30 wt% and 55 wt% and indium is present in an amount selected from the range between zero wt% and 10 wt%.
Claim 4
Dependent Claim
39 words
A low mercury vapor pressure discharge lamp comprising a light permeable sealed tube having means for establishing an electrical discharge therein, said tube containing a quantity of metal vapor and an amalgam as claimed in claim 1 or 2.
Claim 5
Dependent Claim
17 words
A discharge lamp as claimed in claim 3, wherein an auxiliary amalgam is present in the tube.
Claim 6
Dependent Claim
35 words
A discharge lamp as claimed in claim 4, wherein the amalgam and the auxiliary amalgam are positioned in the tube such that, in use, the auxiliary amalgam is at a higher temperature than the amalgam.
Claim 7
Dependent Claim
36 words
A discharge lamp as claimed in claim 5, in which the means for establishing an electrical discharge includes a pair of spaced apart electrode structures and the auxiliary amalgam is mounted on one of the structures.
Claim 8
Dependent Claim
23 words
A discharge lamp as claimed in claim 6, in which the auxiliary amalgam includes molybdenum or stainless steel having a coating of indium.
Claim 9
Dependent Claim
27 words
A discharge lamp as claimed in any one of the claims 3 to 7, in which the light permeable tube is contained within a light permeable globe.
Claim 10
Dependent Claim
18 words
A discharge lamp as claimed in claim 8, in which an electrical ballast is contained within the globe.
References Cited (Backward Citations)
No citation records indexed.
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