EP0104594A2 - Lampe à double enveloppe. - Google Patents

Lampe à double enveloppe. Download PDF

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Publication number
EP0104594A2
EP0104594A2 EP83109346A EP83109346A EP0104594A2 EP 0104594 A2 EP0104594 A2 EP 0104594A2 EP 83109346 A EP83109346 A EP 83109346A EP 83109346 A EP83109346 A EP 83109346A EP 0104594 A2 EP0104594 A2 EP 0104594A2
Authority
EP
European Patent Office
Prior art keywords
shield
light
lamp
containment
mesh
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83109346A
Other languages
German (de)
English (en)
Other versions
EP0104594B1 (fr
EP0104594A3 (en
Inventor
Philip J. White
Robert S. White, Jr.
William Keefe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Osram Sylvania Inc
Original Assignee
GTE Products Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GTE Products Corp filed Critical GTE Products Corp
Publication of EP0104594A2 publication Critical patent/EP0104594A2/fr
Publication of EP0104594A3 publication Critical patent/EP0104594A3/en
Application granted granted Critical
Publication of EP0104594B1 publication Critical patent/EP0104594B1/fr
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/34—Double-wall vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/50—Auxiliary parts or solid material within the envelope for reducing risk of explosion upon breakage of the envelope, e.g. for use in mines

Definitions

  • This invention relates to light-source capsule containment devices and electric lamps employing such devices.
  • the term "light-source capsule” denotes an arc tube of an arc discharge lamp, a halogen capsule of a tungsten halogen lamp, or any light-emitting capsule within the outer envelope of a lamp where the possibility of a lamp-containment failure exists.
  • efficacy or luminous efficacy used herein are a measure expressed in lumens per watt of the total luminous flux emitted by a light source over all wavelengths divided by the power input of the source.
  • Another object of this invention is to improve the operating safety characteristics of tungsten halogen lamps.
  • a light-source capsule containment device comprising a shield, containment means, and mounting means.
  • the shield has a light-transmissive body enclosing a cavity.
  • the body of the shield has at least one opening in it.
  • the containment means substantially contains shards of the shield,
  • the containment means has a minimal effect on the transmissiveness of the shield.
  • the mounting means provides for mounting the containment means operatively with respect to the shield.
  • a lamp having a light-source capsule containment device Such lamp comprises an outer envelope, a light-source capsule, a stem, a shield, containment means, and mounting means.
  • the light-source capsule is mounted on the stem within the outer envelope.
  • the shield has a light-transmissive body which encloses a cavity.
  • the body of the shield has at least one opening in it.
  • the shield is mounted such that the light-source capsule is substantially contained within the cavity of the shield.
  • the containment means substantially restricts shards of the shield and shards of the light-source capsule from colliding with and . shattering the outer envelope in the event the light-source capsule bursts and causes the shattering of the shield.
  • the containment means preferably has a minimal effect on the efficacy of the lamp.
  • the mounting means provides for operatively mounting the containment means with respect to the shield.
  • FIG. 1 shows a light-source capsule containment device 2 comprising shield 1, containment means 3, and mounting means 5.
  • Shield 1 is a light-transmissive cylinder.
  • Containment means 3 is a loosely woven wire mesh 4 which is wrapped around and substantially surrounds shield 1.
  • Mesh 4 may be sewn or constructed such that the mesh forms a continuous cylinder around the exterior of shield 1.
  • Mounting means 5 comprises two metal straps 6 which secure mesh 4 to shield 1.
  • Metal straps 6 may be bound by appropriate means, such as welding or clamping.
  • FIG. 2 shows an alternate embodiment of light-source capsule containment device 2 comprising shield 9, containment means 11, and mounting means 13.
  • Shield 9 comprises light-transmissive cylinder 15 and dome 17 fused into a single light-transmissive body.
  • Containment means 11 is a loosely-woven wire mesh 12 which surrounds shield 9 laterally and about dome 17.
  • Mesh 12 may be sewn or constructed such that the mesh forms a continuous enclosure around the exterior of shield 9 everywhere except in the vicinity of opening 19.
  • Mounting means 13 comprises a metal strap 14.
  • Mesh 12 may be securely mounted to shield 9 with strap 14.
  • 'Strap 14 may be bound by appropriate means, such as welding or clamping.
  • FIG 3 shows a lamp 8 with light-source containment device 2.
  • Lamp 8 comprises outer envelope 21, light-source capsule 23, stem 25, shield 1, containment means 3, and mounting means 5.
  • lamp 8 is an arc discharge lamp and light-source capsule 23 is a double-ended arc tube 24.
  • Containment device 2, comprising shield-1, containment means 3, and mounting means 5, is the identical embodiment shown in FIG. 1 above.
  • Containment device 2 is mechanically mounted within outer envelope 21 to lamp mount 33 by means of support wires 31 such that containment device 2 substantially surrounds arc tube 24 laterally.
  • Strap 10 being the closer of the two straps of mounting means 5 to lamp mount 33, is rigidly fastened to support wires 31.
  • Support wires 31 are rigidly fastened to lamp mount 33.
  • Lamp mount 33 is mounted on stem 25. Rigid mechanical fastening may be accomplished by welding, clamping,-or other suitable means.
  • shield 1 will absorb a substantial portion of the shards and energy emanating from such burst. Frequently, shield 1 will be shattered by the effects of the burst. At this point, mesh 4 is critical. Mesh 4 will substantially restrict shards of shield 1 and shards of arc tube 24 from shattering outer envelope 21. Thus, the protection against the possibility of a lamp-containment failure has been significantly improved.
  • FIG. 4 shows an enlarged partial view of mesh 4.
  • the stitching of the mesh is approximately square. As shown in the diagram, distance x is size of the stitch.
  • FIG. 5 shows an enlarged partial view of another embodiment of containment means 3 comprising a rigid mesh 35. This type of mesh or screen is well known.
  • the containment means is exterior to the shield. There are other embodiments where the containment means may be imbedded in the shield.
  • the containment means is a loosely woven wire mesh. In other embodiments, the containment means may be a rigid mesh. In some embodiments, the loosely woven mesh may be preferred because of its superior energy-containing capability. In other embodiments, the rigid mesh may be preferred because of its tractability or greater transmissiveness.
  • the mesh be highly transmissive of visible light so that there will be a minimal effect on the efficacy of the lamp.
  • a certain percentage of light will be reflected by the mesh on the light's first pass through the shield.
  • a portion of the reflected light will be unobstructed by the mesh on the reflected light's subsequent pass or passes through the shield.
  • the net reduction in luminous efficacy is less than would be expected by estimating the percentage of the area of the shield covered by the mesh.
  • efficacy was reduced by less than 5% due to the presence of the mesh. Because of the partial diffusion caused by the mesh, lamps with mesh-containment devices tend to have less glare.
  • the selection of construction materials for the shield and containment means is heavily influenced by the environment within the outer envelope during operation of the lamp and immediately following a burst of the light-source capsule.
  • the ambient temperature about the shield and contaiment means may be in excess of 300° C.
  • the ambient pressure about the shield and containment means may be in the neighborhood of 30 atmospheres. Because of their excellent high-temperature properties and transmissiveness, quartz, fused silica,. Pyrex, and hard glass would be suitable materials for the construction of the shield.
  • Stainless-steel wire with a high chromium content is a preferred material for the construction of the containment mesh and.mounting strap or straps because of its superior high-temperature properties, relatively low coefficient of thermal expansion, good resistance to oxidation and corrosion, and high tensile strength.
  • the mesh size i.e., the number of stitches per inch
  • the mesh size should be selected such that the mesh will contain shards with mass large enough to be likely to cause a rupture of the outer envelope in the event of a burst of the light-source capsule.
  • the selection of mesh size is dependent on many factors, such as the type of lamp, the properties of the light-source capsule, the atmosphere within the capsule, the type of mesh, the diameter and tensile strength of the wire in the mesh, etc,
  • FIG. 3 there is shown an arc discharge lamp having a double-ended arc tube and a cylindrical containment device.
  • arc discharge lamps with" double-ended arc tubes employ domed containment devices like the device shown in FIG. 2.
  • arc discharge lamps with single-ended arc tubes employ domed containment devices. All of the benefits and variations of embodiments that have been disclosed with respect to arc discharge lamps apply with equal effectiveness and validity to tungsten halogen lamps and more generally to any electric lamps having a light-source capsule within an outer envelope where the possibility of lamp-containment failure exists.
  • Each lamp employed a quartz shield.
  • the containment means was a loosely woven wire mesh surrounding the shield. Mesh sizes ranged from 8 to 20 stitches per inch.
  • the mesh was constructed of stainless-steel wire having a diameter of approximately .005 inches.
  • the mounting means comprised one or two .stainless-steel straps.
  • the mounting means for securing the containment means to the shield may be inherent in the shield or containment means.
  • the containment means is imbedded in the shield.
  • the containment means is secured to the shield by means of elastic or adhesive forces exerted by the containment means itself.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP83109346A 1982-09-23 1983-09-20 Lampe à double enveloppe. Expired EP0104594B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42231282A 1982-09-23 1982-09-23
US422312 1982-09-23

Publications (3)

Publication Number Publication Date
EP0104594A2 true EP0104594A2 (fr) 1984-04-04
EP0104594A3 EP0104594A3 (en) 1984-11-07
EP0104594B1 EP0104594B1 (fr) 1989-01-25

Family

ID=23674305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83109346A Expired EP0104594B1 (fr) 1982-09-23 1983-09-20 Lampe à double enveloppe.

Country Status (4)

Country Link
EP (1) EP0104594B1 (fr)
AU (1) AU570012B2 (fr)
CA (1) CA1237111A (fr)
DE (1) DE3379089D1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0238200A3 (fr) * 1986-02-19 1989-08-23 McLauchlan, Robert Alexander Protecteur pour tube de lumière et tube
EP0361530A3 (fr) * 1988-09-30 1990-08-01 Gte Products Corporation Montage de lampe utilisant un écran protecteur et un grillage de fibres céramiques de retenue
EP0306269A3 (fr) * 1987-08-28 1991-01-23 Gte Products Corporation Lampe électrique à ampoule double
WO1992010848A1 (fr) * 1990-12-06 1992-06-25 Gte Products Corporation Ensemble lampe a reflecteur comportant un tube a arc a halogene-metal
WO2012065870A1 (fr) * 2010-11-17 2012-05-24 Osram Ag Lampe à décharge comportant un piston extérieur entouré par un grillage servant de protection contre les fissures

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1190369B (it) * 1985-06-19 1988-02-16 Montefluos Spa Composizioni covulcanizzabili di fluoroelastomeri a migliorata stabilita' chimica
US6995513B2 (en) 2001-05-08 2006-02-07 Koninklijke Philips Electronics N.V. Coil antenna/protection for ceramic metal halide lamps

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE432316A (fr) * 1938-01-25
NL50256C (fr) * 1938-04-02
DE1080225B (de) * 1954-03-17 1960-04-21 Viktor Weiss Langgestreckte rohrfoermige elektrische Lampe
US4281274A (en) * 1979-08-01 1981-07-28 General Electric Co. Discharge lamp having vitreous shield

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0238200A3 (fr) * 1986-02-19 1989-08-23 McLauchlan, Robert Alexander Protecteur pour tube de lumière et tube
EP0306269A3 (fr) * 1987-08-28 1991-01-23 Gte Products Corporation Lampe électrique à ampoule double
EP0361530A3 (fr) * 1988-09-30 1990-08-01 Gte Products Corporation Montage de lampe utilisant un écran protecteur et un grillage de fibres céramiques de retenue
WO1992010848A1 (fr) * 1990-12-06 1992-06-25 Gte Products Corporation Ensemble lampe a reflecteur comportant un tube a arc a halogene-metal
WO2012065870A1 (fr) * 2010-11-17 2012-05-24 Osram Ag Lampe à décharge comportant un piston extérieur entouré par un grillage servant de protection contre les fissures
US8786187B2 (en) 2010-11-17 2014-07-22 Osram Gmbh Discharge lamp with an outer bulb surrounded by a wire gauze as explosion protection

Also Published As

Publication number Publication date
EP0104594B1 (fr) 1989-01-25
EP0104594A3 (en) 1984-11-07
AU570012B2 (en) 1988-03-03
CA1237111A (fr) 1988-05-24
AU1950783A (en) 1984-03-29
DE3379089D1 (en) 1989-03-02

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