EP0101519A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Metal vapor discharge lamp
Assignee: Mitsubishi Electric Corp
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Filing: 1983-02-07
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Granted: —
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Expires: 2003-02-07
Abstract
Abstract A metallic vapor discharge lamp which has an outer tube sealed with a predetermined gas therein, and a light-emitting tube including a pair of electrodes mounted in the tube and provided in the discharge space formed therein, with at least a rare gas and mercury sealed into the discharge space, wherein a lower light transmission cover is provided in the vicinity of the end at the lower position of the end of the light-emitting tube, covering at least the lower end of the light emitting tube when it is alight. In this manner, the temperature-reducing action of the lower part of the light-emitting tube due to convection in the gas in the outer tube can be suppressed, thereby increasing the temperature of the coldest part of the light-emitting tube to increase the vapor pressure in the light-emitting tube suitably, and thereby improve the efficiency of the tamp.
Inventors
- 👤 Masato Mitsubishi Denki K.K. Saito
- 👤 Ryo Mitsubishi Denki K.K. Suzuki
- 👤 Keiji Mitsubishi Denki K.K. Watanabe
- 👤 Michihiro Mitsubishi Denki K.K. Tsuchihashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 10:10
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/045
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
93 words
(1) A metal vapor discharge lamp comprising an outer tube having a predetermined gas filled in an inner space; a light emitting tube disposed in the interior or said outer tube, having a pair of electrodes disposed in a discharge space formed in the interior and at least a rare gas and mercury filled in said discharge space; and a lower, light transmissive covering member located in the vicinity of one of end parts of said light emitting tube located downdard during the lighting to cover at least the lower end part thereof.
Claim 2
Dependent Claim
35 words
(2) A metal vapor discharge lamp according to said claim 1 wherein said lower covering member covers substantially the whole body of the lower end part including a sealed part of the light emitting tube.
Claim 3
Dependent Claim
34 words
(3) A metal vapor discharge lamp according to said claim 1 wherein said lower covering member covers the whole body of the lower end part including a sealed part of the light emitting tube.
Claim 4
Dependent Claim
25 words
(4) A metal vapor discharge lamp according to said claim 1 wherein said lower covering member is formed of a heat resisting, light transmissive material.
Claim 5
Dependent Claim
31 words
(5) A metal vapor discharge lamp according to said claim 4 wherein said lower covering member is formed of either one of a light transmissive glass and a light transmissive ceramic.
Claim 6
Dependent Claim
39 words
(6) A metal vapor discharge lamp according to said claim 1 wherein said lower covering member covers at least the lower end part of the light emitting tube by forming spacing between the same and said lower end part.
Claim 7
Dependent Claim
22 words
(7) A metal vapor discharge lamp according to said claim 6 wherein said spacing has a distance of at least 0.5 mm.
Claim 8
Dependent Claim
49 words
(8) A metal vapor discharge lamp according to said claim 6 wherein the upper end part of said lower covering member is made into an open structure and a space formed between the covering member and the light emitting tube communicates with a space formed of the outer tube.
Claim 9
Dependent Claim
34 words
(9) A metal vapor discharge lamp according to said claim 6 wherein said lower covering member has a shape substantially similar to the external shape of the end part of said light emitting tube.
Claim 10
Dependent Claim
44 words
(10) A metal vapor discharge lamp according to said claim 1 wherein the upper end of said lower covering member is located below the extremity of an upper one of said electrodes and above a lower sealed bottom surface of the light emitting tube.
Claim 11
Dependent Claim
31 words
(11) A metal vapor discharge lamp according to said claim 10 wherein the upper end of said lower covering member is located substantially at the center between said pair of electrodes.
Claim 12
Dependent Claim
28 words
(12) A metal vapor discharge lamp according to said claim 1 wherein said light emitting tube is provided on the lower end part with a heat insulating film.
Claim 13
Dependent Claim
30 words
(13) A metal vapor discharge lamp according to said claim 1 wherein said light emitting tube is made in a light transmissive structure except for lead parts of said electrodes.
Claim 14
Dependent Claim
49 words
(14) A metal vapor discharge lamp according to said claim 1 wherein said lower covering member is a tube-like member with a bottom and made into a buttom surface structure having the bottom surface thereof closed substantially throughout the entire area except for a lead part of an electrode.
Claim 15
Dependent Claim
61 words
(15) A metal vapor discharge lamp according to said claim 1 wherein said lower covering member covers at least the lower end part of the light emitting tube by forming a spacing between the same and the lower end part thereof and also the upper and lower end parts of the covering member are constructed so that said space is closed.
References Cited (Backward Citations)
No citation records indexed.
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