EP0140330B1 - Lampe miniature à incandescence - Google Patents

Lampe miniature à incandescence Download PDF

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Publication number
EP0140330B1
EP0140330B1 EP19840112780 EP84112780A EP0140330B1 EP 0140330 B1 EP0140330 B1 EP 0140330B1 EP 19840112780 EP19840112780 EP 19840112780 EP 84112780 A EP84112780 A EP 84112780A EP 0140330 B1 EP0140330 B1 EP 0140330B1
Authority
EP
European Patent Office
Prior art keywords
lamp
xenon
volume
ratio
filament
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.)
Expired
Application number
EP19840112780
Other languages
German (de)
English (en)
Other versions
EP0140330A3 (en
EP0140330A2 (fr
Inventor
Yasuhiro C/O Patent Division Nieda
Kiyokazu C/O Patent Division Honda
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 Corp
Original Assignee
Toshiba 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.)
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Publication date
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Application filed by Toshiba Corp filed Critical Toshiba Corp
Publication of EP0140330A2 publication Critical patent/EP0140330A2/fr
Publication of EP0140330A3 publication Critical patent/EP0140330A3/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/02—Incandescent bodies
    • H01K1/14—Incandescent bodies characterised by the shape
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K1/00—Details
    • H01K1/50—Selection of substances for gas fillings; Specified pressure thereof

Definitions

  • the present invention relates to a miniature incandescent lamp and, more particularly, to an improvement in lamp characteristics.
  • an inert gas is filled in a bulb to decrease filament evaporation, and a greater effect can be obtained when the molecular weight of the filled gas is larger.
  • a filament temperature of a lamp sealing krypton gas can be higher than that of a lamp filling argon gas and has a lower filling gas loss than the lamp filling argon gas.
  • the above-mentioned effect can be typically reinforced, as described in Japanese Utility Model Publication No. 54-2068.
  • Xenon has a lower ionization voltage than those of argon and krypton.
  • a high content of xenon is filled in the bulb, an arc discharge occurs between coil turns of the filament, and the filament is burnt out.
  • the ratio of xenon to krypton is reduced to 5 to 10.4% by volume.
  • nitrogen is mixed in a gas mixture of krypton and xenon to increase an arc discharge starting voltage.
  • the xenon content is low and the content of nitrogen is high, the effect of xenon is impaired.
  • a conventional halogen lamp is known as an incandescent lamp having high luminous efficacy and long life.
  • the bulb wall temperature must be increased to activate the halogen cycle in the halogen lamp.
  • hard glass such as quartz or aluminosilicate glass having high heat resistance must be used as a bulb material.
  • hard glass is expensive and is difficult to work with.
  • the bulb when a miniature lamp has a lamp power of less than 8 W, the bulb must be extremely minuaturized to increase the bulb wall temperature. As a result, the manufacturing process becomes complicated, and hard glass, which is difficult to work with, cannot be used.
  • the lamp size is decreased, it is difficult to control and fill the proper amount of halogen gas in the lamp.
  • the filament coil wire When the lamp is minuaturized, the filament coil wire must be thinner. The life of the lamp becomes shortened due to a chemical reaction between the halogen gas and the thin coil wire. Therefore, a miniature halogen lamp involves difficult manufacturing techniques and results in high cost.
  • US--A-2 891 189 discloses an gas-filled electric incandescent lamp filled with nitrogen and xenon, wherein the xenon may be pure xenon or a gas mixture containing xenon as an constituent of at least about 80% by volume.
  • the minimum distance between the nearest points of highest potential difference of the filament depends on the rated voltage of the lamp, the rated energy consumption of the lamp, the luminous efficiency and a certain numerical factor.
  • US-A-4 208 609 discloses an incandescent lamp in which a ratio defined by the center to center spacing of the turns of the filament, divided by the diameter of the filament is between 1,4 and 1,8. If this ratio is transformed to a value defined by the spacing between facing sides of two adjacent turns of the filament, divided by the diameter of the filament, there is obtained a value between 0.4 and 0.8.
  • the object of the present invention is to provide a miniature incandescent lamp, which shows high luminous efficacy and long life and which prevents an arc discharge between turns of a coiled filament.
  • a miniature incandescent lamp of the present invention comprises a glass bulb containing an inert gas therein and a coiled filament arranged in the bulb.
  • the inert gas contains xenon and nitrogen.
  • a content of xenon in the inert gas is 80% b volume or more.
  • a pitch ratio p/d of a coil pitch (spacing between two adjacent coil turns) p to a wire diameter d is 1.4 or more.
  • the xenon content preferably falls within the range of 90 and 98% by volume.
  • a nitrogen content preferably falls within the range of 2 and 10% by volume so as to obtain the effect of xenon and prevent the arc discharge.
  • the ratio p/d When the ratio p/d is larger, the effect of preventing the arc discharge can be improved.
  • the upper limit of the pitch ratio is 2.0.
  • the ratio p/d preferably falls within the range of 1.4 and 1.8.
  • the inert gas filled in the lamp of the present invention is not limited to xenon and nitrogen.
  • the inert gas may contain argon and/or krypton.
  • the application of the lamp according to the present invention is not limited to use in vehicles but can be extended to decorative illuminations for home use.
  • the lamp base is not limited to be of a wedge type but can be of an Edison type.
  • a material for the lamp bulb according to the present invention may comprise soft glass or hard glass.
  • a large amount of xenon having high molecular weight i.e., a low thermal conductivity coefficient
  • a miniature incandescent lamp shown in Fig. 1 comprises a wedge base type lamp having ratings of 12 V (5 W).
  • a bulb 1 comprises soft glass such as lead glass or soda-lime glass.
  • a tungsten filament 2 is mounted in the bulb 1 and is connected to lead wires 3.
  • the lead wires 3 are sealed at a pinch-sealed portion 4 and extend outside therefrom. Lead-out portions 6 of the lead wires 3 are folded along the side surfaces of the pinch sealed portion 4.
  • the central portion of the filament 2 is supported by an anchor wire 5.
  • the filament 2 comprises a single coil made of a tungsten wire.
  • a ratio p/d of a coil pitch (spacing between coil turns) p (mm) to a wire diameter d (mm) shown in Fig. 2 is given as 1.8.
  • the color temperature , luminous flux and life of the miniature incandescent lamp of the present invention are better than those of the conventional lamp.
  • the convection loss of the gas is decreased, so that the luminous flux after 100 hours can be more than 70 lm.
  • xenon has a low ionization voltage, and an arc discharge tends to occur between the coil turns of the filament.
  • an arc discharge starting voltage becomes as low as 14.5 V (ratio at the rated voltage is 1.2).
  • the volume content of xenon gas in the filling gas becomes less than 80%, the arc discharge starting voltage is increased.
  • the luminous flux after 1,000 hours becomes 55 lm or less. In this manner, the effect of xenon gas is extremely impaired.
  • the volume % of xenon gas is kept at 80% or more, and the effect of xenon gas is maintained.
  • nitrogen gas is mixed in xenon gas and the ratio p/d of the coil pitch p to the wire diameter d is kept to be 1.4 or more, thereby preventing a decrease in the arc discharge starting voltage.
  • the present inventors made an experiment to clarify the relationship between the ratio p/d and the arc discharge starting voltage in a 12 V, 5 W type miniature incandescent lamp. Results are shown in Fig. 3.
  • the arc discharge starting voltage becomes sufficiently high when the ratio p/d us 1:4 or more.
  • the ratio p/d becomes less than 1.4, the electric field strength between the coil turns is increased, so that the arc discharge tends to occur.
  • the ratio p/d is 1.4 or more, however, the electric field strength between the coil turns is descreased. As a result, the arc discharge will not substantially occur.
  • the inert gas contains 80% by volume or more of xenon, the gas loss becomes small and the liminous efficacy is improved.
  • the filament evaporation of the lamp can be decreased to provide long life.
  • nitrogen is mixed in xenon, and the ratio p/d of the filament is 1.4 or more. Therefore, the arc discharge will not occur between the turns of the coiled filament.
  • Soft glass is used as the bulb material, so that the lamp can be easily manufactured at low cost.

Landscapes

  • Discharge Lamp (AREA)

Claims (7)

1. Lampe à incandescence miniature comprenant une ampoule de verre (1) contenant un gaz inerte et un filament spiralé (2) disposé dans ladite ampoule (1), le gaz inerte contenant du xénon et de l'azote, la teneur en xénon du gaz inerte n'étant pas inférieure à 80% en volume, caractérisé en ce que le rapport d'écartement p/d de l'écartement p entre deux spires adjacentes du filament spiralé (2) au diamètre d du fil n'est pas inférieur à 1,4.
2. Lampe selon la revendication 1, caractérisée en ce que la teneur en xénon s'établit dans l'intervalle de 90% en volume à 98% en volume.
3. Lampe selon la revendication 1 ou 2, caractérisée en ce que la teneur en azote s'établit dans l'intervalle de 2% en volume à 10% en volume.
4. Lampe selon la revendication 1, 2 ou 3, caractérisée en ce que le gaz inerte contient en outre au moins une matière choisie dans le groupe formé de l'argon et du krypton.
5. Lampe selon l'une quelconque des revendications 1 à 4, caractérisée en ce que le rapport p/d s'établit dans les limites de 1,4 à 2,0.
6. Lampe selon la revendication 5, caractérisée en ce que le rapport p/d s'établit dans les limites de 1,4 à 1,8.
7. Lampe selon l'une quelconque des revendications 1 à 6, caractérisée en ce que l'ampoule est constituée de verre tendre.
EP19840112780 1983-10-31 1984-10-23 Lampe miniature à incandescence Expired EP0140330B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP20265383A JPS6095850A (ja) 1983-10-31 1983-10-31 小形白熱電球
JP202653/83 1983-10-31

Publications (3)

Publication Number Publication Date
EP0140330A2 EP0140330A2 (fr) 1985-05-08
EP0140330A3 EP0140330A3 (en) 1986-01-22
EP0140330B1 true EP0140330B1 (fr) 1989-01-04

Family

ID=16460907

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840112780 Expired EP0140330B1 (fr) 1983-10-31 1984-10-23 Lampe miniature à incandescence

Country Status (4)

Country Link
EP (1) EP0140330B1 (fr)
JP (1) JPS6095850A (fr)
DE (1) DE3475989D1 (fr)
GB (2) GB8609925D0 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6210854A (ja) * 1985-06-26 1987-01-19 スタンレー電気株式会社 高効率白熱電球
JPS62167365U (fr) * 1986-04-14 1987-10-23
EP0295592A3 (fr) * 1987-06-13 1991-01-02 Knut Otto Sassmannshausen Lampe électrique
TW203145B (fr) * 1991-04-09 1993-04-01 Hayashibara Ken
US5207503A (en) * 1992-02-05 1993-05-04 Lucifer Lighting Company Xenon festoon style lamp
AT407961B (de) * 1998-12-03 2001-07-25 Alfred Dr Schneider Bestrahlungsleuchte
JP3863554B2 (ja) * 2004-01-07 2006-12-27 松下電器産業株式会社 白熱電球及び白熱電球用フィラメント

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR785139A (fr) * 1934-04-23 1935-08-02 Ets Claude Paz & Silva Perfectionnements aux lampes électriques à incandescence
NL216253A (fr) * 1956-04-28
JPS53130880U (fr) * 1977-03-24 1978-10-17
US4208609A (en) * 1978-09-25 1980-06-17 General Electric Company Squirm resistant filament
JPS5619334U (fr) * 1979-07-25 1981-02-20
JPS58164807A (ja) * 1982-03-26 1983-09-29 東芝ライテック株式会社 標識灯

Also Published As

Publication number Publication date
DE3475989D1 (en) 1989-02-09
EP0140330A3 (en) 1986-01-22
EP0140330A2 (fr) 1985-05-08
JPH0480504B2 (fr) 1992-12-18
GB8609925D0 (en) 1986-05-29
GB8613588D0 (en) 1986-07-09
JPS6095850A (ja) 1985-05-29

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