EP0140330A2 - Miniaturglühlampe - Google Patents
Miniaturglühlampe Download PDFInfo
- Publication number
- EP0140330A2 EP0140330A2 EP84112780A EP84112780A EP0140330A2 EP 0140330 A2 EP0140330 A2 EP 0140330A2 EP 84112780 A EP84112780 A EP 84112780A EP 84112780 A EP84112780 A EP 84112780A EP 0140330 A2 EP0140330 A2 EP 0140330A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- xenon
- bulb
- inert gas
- volume
- 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
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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
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- 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.
- a miniature incandescent lamp of the present invention comprises a glass bulb filling 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% by volume or more.
- a ratio p/d of a coil pitch (spacing between 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 p 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 1m.
- 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 1m 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 is 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 decreased. 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 luminous 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)
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 true EP0140330A2 (de) | 1985-05-08 |
EP0140330A3 EP0140330A3 (en) | 1986-01-22 |
EP0140330B1 EP0140330B1 (de) | 1989-01-04 |
Family
ID=16460907
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19840112780 Expired EP0140330B1 (de) | 1983-10-31 | 1984-10-23 | Miniaturglühlampe |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0140330B1 (de) |
JP (1) | JPS6095850A (de) |
DE (1) | DE3475989D1 (de) |
GB (2) | GB8609925D0 (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0241599A2 (de) * | 1986-04-14 | 1987-10-21 | Stanley Electric Co., Ltd. | Hochwirksame Glühlampe |
EP0295592A2 (de) * | 1987-06-13 | 1988-12-21 | Knut Otto Sassmannshausen | Elektrische Lampe |
EP0508593A2 (de) * | 1991-04-09 | 1992-10-14 | Hayashibara, Ken | Füllzusammensetzung für eine Glühlampe, diese enthaltende Glühlampe und ihre Verwendung |
AT407961B (de) * | 1998-12-03 | 2001-07-25 | Alfred Dr Schneider | Bestrahlungsleuchte |
Families Citing this family (3)
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 |
US5207503A (en) * | 1992-02-05 | 1993-05-04 | Lucifer Lighting Company | Xenon festoon style lamp |
WO2005067004A1 (ja) * | 2004-01-07 | 2005-07-21 | Matsushita Electric Industrial Co., Ltd. | 白熱電球及び白熱電球用フィラメント |
Citations (3)
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 |
US2891189A (en) * | 1956-04-28 | 1959-06-16 | Egyesuelt Izzolampa | Gas-filled electric incandescent lamp |
US4208609A (en) * | 1978-09-25 | 1980-06-17 | General Electric Company | Squirm resistant filament |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53130880U (de) * | 1977-03-24 | 1978-10-17 | ||
JPS5619334U (de) * | 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 |
-
1983
- 1983-10-31 JP JP20265383A patent/JPS6095850A/ja active Granted
-
1984
- 1984-10-23 EP EP19840112780 patent/EP0140330B1/de not_active Expired
- 1984-10-23 DE DE8484112780T patent/DE3475989D1/de not_active Expired
-
1986
- 1986-04-23 GB GB868609925A patent/GB8609925D0/en active Pending
- 1986-06-04 GB GB868613588A patent/GB8613588D0/en active Pending
Patent Citations (3)
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 |
US2891189A (en) * | 1956-04-28 | 1959-06-16 | Egyesuelt Izzolampa | Gas-filled electric incandescent lamp |
US4208609A (en) * | 1978-09-25 | 1980-06-17 | General Electric Company | Squirm resistant filament |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0241599A2 (de) * | 1986-04-14 | 1987-10-21 | Stanley Electric Co., Ltd. | Hochwirksame Glühlampe |
EP0241599A3 (de) * | 1986-04-14 | 1989-03-22 | Stanley Electric Co., Ltd. | Hochwirksame Glühlampe |
EP0295592A2 (de) * | 1987-06-13 | 1988-12-21 | Knut Otto Sassmannshausen | Elektrische Lampe |
EP0295592A3 (de) * | 1987-06-13 | 1991-01-02 | Knut Otto Sassmannshausen | Elektrische Lampe |
EP0508593A2 (de) * | 1991-04-09 | 1992-10-14 | Hayashibara, Ken | Füllzusammensetzung für eine Glühlampe, diese enthaltende Glühlampe und ihre Verwendung |
EP0508593A3 (en) * | 1991-04-09 | 1992-12-23 | Hayashibara, Ken | Filling composition for incandescent lamp, and incandescent lamp containing the same and its use |
AT407961B (de) * | 1998-12-03 | 2001-07-25 | Alfred Dr Schneider | Bestrahlungsleuchte |
Also Published As
Publication number | Publication date |
---|---|
DE3475989D1 (en) | 1989-02-09 |
GB8613588D0 (en) | 1986-07-09 |
EP0140330B1 (de) | 1989-01-04 |
JPS6095850A (ja) | 1985-05-29 |
GB8609925D0 (en) | 1986-05-29 |
EP0140330A3 (en) | 1986-01-22 |
JPH0480504B2 (de) | 1992-12-18 |
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Legal Events
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PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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17P | Request for examination filed |
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