EP0451997A2 - Metalldampfentladungslampe - Google Patents

Metalldampfentladungslampe Download PDF

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Publication number
EP0451997A2
EP0451997A2 EP91302736A EP91302736A EP0451997A2 EP 0451997 A2 EP0451997 A2 EP 0451997A2 EP 91302736 A EP91302736 A EP 91302736A EP 91302736 A EP91302736 A EP 91302736A EP 0451997 A2 EP0451997 A2 EP 0451997A2
Authority
EP
European Patent Office
Prior art keywords
bulb
light source
discharge lamp
metal vapor
source bulb
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.)
Withdrawn
Application number
EP91302736A
Other languages
English (en)
French (fr)
Other versions
EP0451997A3 (en
Inventor
Akira Itoh
Kazuyoshi Okamura
Kazuiki Uchida
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.)
Toshiba Lighting and Technology Corp
Original Assignee
Toshiba Lighting and Technology 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 Toshiba Lighting and Technology Corp filed Critical Toshiba Lighting and Technology Corp
Publication of EP0451997A2 publication Critical patent/EP0451997A2/de
Publication of EP0451997A3 publication Critical patent/EP0451997A3/en
Withdrawn legal-status Critical Current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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/70—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr
    • H01J61/74—Lamps with low-pressure unconstricted discharge having a cold pressure < 400 Torr having a main light-emitting filling of difficult vaporisable metal vapour, e.g. sodium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
    • H01J61/825—High-pressure sodium lamps

Definitions

  • the present invention relates generally to a metal vapor discharge lamp, and more particularly, to a metal vapor discharge lamp having a bent-shape ceramic bulb.
  • a metal vapor discharge lamp such as a sodium discharge lamp generally comprises a hermetically sealed light source bulb made of translucent material, e.g., a glass tube, a pair of electrodes mounted in the light source bulb through both ends of the bulb, sodium vapor and mercury vapor filled in the bulb as a luminous material and a buffer material, respectively, and rare gas for a lighting starter filled in the light source bulb.
  • Alumina glass has an excellent corrosion-resistancy to sodium and an excellent heat-resistancy in comparison to silica glass.
  • this kind of discharge lamp (referred to as a ceramic discharge lamp hereinafter) may present a higher lamp efficiency in comparison to a conventional discharge lamp having the silica glass bulb.
  • the ceramic bulb such as the alumina glass bulb, however, is hard to be formed into a bent-shape bulb, due to its higher heat-resistancy. That is, the ceramic bulb needs a very high temperature to be softened enough for a hot shaping. Thus, conventionally the ceramic discharge lamp had a straight ceramic bulb.
  • the interior lighting sources are generally demanded to be as small in size as possible.
  • a good approach for reducing the size of the light source bulb is to form the bulb into a bent-shape bulb, e.g., a U-shape bulb. Because the light source bulb is formed in a curved shape, it becomes possible to form the light source bulb into the bent-shape bulb while a distance between electrodes is kept at a required value. Thus, it was highly typical to use a metal vapor discharge lamp having a bent-shape silica glass bulb for the interior lighting sources.
  • the alumina glass bulb has been designed to have a thickness, 0.5 through 1.2 mm, and the discharge lamps were operated at a wall load about 12 through 30 W/cm2.
  • the bulb wall temperature does not rise sufficiently for obtaining a desired lamp efficiency.
  • the bulb wall temperature rises to excessively high to cause a sublimation of the alumina glass bulb.
  • the sublimation of the alumina glass bulb results a blackening of an outer envelope encompassing the light source bulb.
  • the present invention seeks to provide a ceramic discharge lamp, i.e., a metal vapor discharge lamp having a bent-shape ceramic bulb which is not easily broken, without deteriorating the lamp efficiency.
  • the present invention also seeks to provide a ceramic discharge lamp which is able to reduce a temperature difference a temperature imbalance between the outer radius wall and the inner radius wall of the bent section of the bulb.
  • the ceramic discharge lamp includes a hermetically sealed bent-shape bulb made of translucent ceramic material, a pair of electrodes mounted in the light source bulb through both ends of the bulb and metal vapor filled in the bulb, wherein the bent-shape ceramic bulb has a wall load A W/cm2 and an inner bulb diameter Di mm which satisfy the following two relations; 12 ⁇ A ⁇ 30, and Di ⁇ -0.5 x A + 18.5.
  • FIGURE 1 a first embodiment of the ceramic discharge lamp having a bent-shape ceramic bulb according to the present invention will be described in detail.
  • an outer envelope 10 made of, e.g., quartz glass, is evacuated and sealed its one end by a stem 12.
  • the stem 12 is coupled to the Edison socket 14.
  • the outer envelope 10 houses a U-shape light source bulb 16 made of a translucent ceramic, e.g., an alumina glass.
  • the light source bulb 16 thus includes a U-shape section 16a and a pair of straight sections 16b, 16b which are separated by a gap L.
  • Both ends of the light source bulb 16 are hermetically sealed with, for instance, ceramic disks 18, 18 through a solder (not shown) such as metallic oxide. These ceramic disks 18, 18 support electrodes 20 and 20, respectively.
  • the light source bulb 16 had following dimensions:
  • the light source bulb 16 is filled with a sodium amalgam (not shown) including sodium at the ratio of 10 through 25 weight percentage and xenon gas at the pressure of 20 through 700 Torr.
  • a sodium amalgam (not shown) including sodium at the ratio of 10 through 25 weight percentage and xenon gas at the pressure of 20 through 700 Torr.
  • the electrodes 20, 20 are coupled to lead wires 22, 22 which extend from the straight sections 16b, 16b of the light source bulb 16 through the ceramic disks 18, 18, respectively.
  • the lead wires 22, 22 are coupled to support wires 24, 24 which extend in the the outer envelope 10 through the stem 12.
  • support wires 24, 24 are coupled to the Edison socket 14 as usual.
  • the straight sections 16b, 16b of the light source bulb 16 are fastened by a bulb holder 26 which is suspended between opposite walls of the outer envelope 10. Both ends of the bulb holder 26 are elastically fixed on the walls through elastic plates 28, 28, respectively. Thus, the light source bulb 16 is securely held in the outer envelope 10.
  • the straight sections 16b, 16b of the light source bulb 16 are aligned to the longitudinal direction of the outer envelope 10, while the U-shape section 16a of the light source bulb 16 faces a top end of the outer envelope 10 which is opposite to the stem 12.
  • the test was performed by varying the wall load A and the inner diameter Di of the light source bulb 16.
  • the wall load A was varied from 10 to 33 W/cm2, while the inner diameter Di was varied from 2.0 to 9.5 mm.
  • the result of the test is shown in the following table 1.
  • FIGURE 2 The results of the breakage examining test, i.e., the presence (x) or absence (o) of the breakage shown in Table 1 are also shown in FIGURE 2.
  • the inventors of the present invention have investigated a cause of the breakage so that it is estimated that the breakage has a close relation to the position of an arc of discharge occurring between the electrodes 20, 20.
  • the discharge arc comes close to the bulb wall of the light source bulb 16.
  • the heat of the inner radius wall 16i is hardly dissipated in comparison to the outer radius wall 16o. It causes a temperature difference between the inner radius wall 16i and the outer radius wall 16o.
  • the inner diameter Di of the light source bulb 16 is reduced to less than 3.5 mm, the breakage of the light source bulb 16 occurs.
  • the discharge arc becomes close to the inner radius wall 16i of the light source bulb 16. This is because the discharge arc tends to take its shortest route at the position near the inner radius wall 16i in the U-shape section 16a. This also causes a large temperature difference between the inner radius wall 16i and the outer radius wall 16o. Thus, when the inner diameter Di of the light source bulb 16 exceeds 8.0 mm, the breakage of the light source bulb 16 again occurs.
  • the inner diameter Di i.e., the inner diameter Di is within the range from 3.5 mm to 8.0 mm, the breakage occurs in relation to both the inner diameter Di and the wall load A of the light source bulb 16.
  • Di - 0.5 x A + 18.5 gives the border.
  • the light source bulb is formed in the U-shape has been explained in the above embodiment, the present invention is applicable to any bent-shape such as a W letter shape, a V letter shape, a rectangularly bent shape etc.
  • the present invention can provide an extremely preferable ceramic discharge lamp.

Landscapes

  • Vessels And Coating Films For Discharge Lamps (AREA)
  • Discharge Lamps And Accessories Thereof (AREA)
EP19910302736 1990-03-31 1991-03-28 Metal vapor discharge lamp Withdrawn EP0451997A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP8648790A JPH03285254A (ja) 1990-03-31 1990-03-31 セラミック放電灯
JP86487/90 1990-03-31

Publications (2)

Publication Number Publication Date
EP0451997A2 true EP0451997A2 (de) 1991-10-16
EP0451997A3 EP0451997A3 (en) 1992-08-12

Family

ID=13888343

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910302736 Withdrawn EP0451997A3 (en) 1990-03-31 1991-03-28 Metal vapor discharge lamp

Country Status (2)

Country Link
EP (1) EP0451997A3 (de)
JP (1) JPH03285254A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6437064B1 (en) 1993-06-24 2002-08-20 Pechiney Emballage Flexible Europe Structures of polymers made from single site catalysts
WO2006104624A1 (en) * 2005-03-09 2006-10-05 General Electric Company Highly transparent ceramic arctubes for high intensity discharge lamps
US7588830B2 (en) 1992-11-13 2009-09-15 Cryovac, Inc. Heat shrinkable films containing single site catalyzed copolymers
WO2011152976A1 (en) * 2010-06-03 2011-12-08 General Electric Company Arc shaped discharge chamber for high intensity discharge automotive lamp

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012009372A (ja) * 2010-06-28 2012-01-12 Stanley Electric Co Ltd 紫外線放電ランプおよびその駆動方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0415398A3 (en) * 1989-08-31 1991-08-07 Toshiba Lighting & Technology Corporation Ceramic electric-discharge lamp incorporating arc tube having at least two curved regions

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7588830B2 (en) 1992-11-13 2009-09-15 Cryovac, Inc. Heat shrinkable films containing single site catalyzed copolymers
US6437064B1 (en) 1993-06-24 2002-08-20 Pechiney Emballage Flexible Europe Structures of polymers made from single site catalysts
WO2006104624A1 (en) * 2005-03-09 2006-10-05 General Electric Company Highly transparent ceramic arctubes for high intensity discharge lamps
WO2011152976A1 (en) * 2010-06-03 2011-12-08 General Electric Company Arc shaped discharge chamber for high intensity discharge automotive lamp
US8253335B2 (en) 2010-06-03 2012-08-28 General Electric Company Arc shaped discharge chamber for high intensity discharge automotive lamp

Also Published As

Publication number Publication date
JPH03285254A (ja) 1991-12-16
EP0451997A3 (en) 1992-08-12

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