US2869011A - Electric incandescent lamp for motor-car lighting - Google Patents
Electric incandescent lamp for motor-car lighting Download PDFInfo
- Publication number
- US2869011A US2869011A US491164A US49116455A US2869011A US 2869011 A US2869011 A US 2869011A US 491164 A US491164 A US 491164A US 49116455 A US49116455 A US 49116455A US 2869011 A US2869011 A US 2869011A
- Authority
- US
- United States
- Prior art keywords
- screen
- lamp
- filament
- dimlight
- incandescent lamp
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K9/00—Lamps having two or more incandescent bodies separately heated
- H01K9/08—Lamps having two or more incandescent bodies separately heated to provide selectively different light effects, e.g. for automobile headlamp
Definitions
- An electric incandescent lamp for motor-car lighting comprising a filament surrounded in part by a screen extending substantially in the axial direction of the lamp is known.
- This kind of lamp is intended to be arranged in a parabolic reflector in such manner that the axis of the lamp coincides at least substantially with the axis of the reflector.
- the presence of the screen ensures that the light emanating from the filament strikes only one half of the reflector and is reflected downwards by it, assuming that the axis of the reflector is positioned horizontally.
- the filament will be referred to hereinafter as dimlight filament and the beam of light produced by it as dimlight beam.
- the dimlight beam is supposed to have non-dazzling properties.
- the bulb of the lamp usually contains a second filament not surrounded by a screen and emitting in co-operation with the said reflector a beam of light which is dazzling.
- the object of the screen is to cut oif the dimlight beam sharply and almost horizontally.
- the envisaged effect cannot be obtained completely, since that portion of the dimlight beam which is located about in the centre of the emitted beam exhibits in a cross-section having a vertically positioned measuring surface, an elevation which is located above the prescribed line indicating the boundary between light and dark. Measurements have revealed that the elevation is accentuated more strongly as the extremity of the dimlight filament more approaches the focus of the associated reflector.
- the present invention has for its purpose to obviate the disadvantageous phenomenon just described with the use of simple means.
- the electric incandescent lamp of the kind mentioned in the preamble for this purpose exhibits the characteristic that the inner side of the screen is dull-black at the area of its end face adjacent the lamp cap and has reflecting properties through its remaining portion.
- One advantageous embodiment of the incandescent lamp according to the invention exhibits the characteristic that, as measured along the axis of the lamp, the
- portion of the screen which has a dull-black surface is coated with graphite, zirconium or zirconium compound.
- the last-mentioned materials have the advantage at the same time to exert the getter action which is desirable for gas-filled car lamps.
- the figure is a perspective view of the assembly contained in the electric incandescent lamp according to the invention, which assembly comprises a screened filament 1, a screen 2, a pole wire 3 which carries the screen 2 and a pole wire 4 to which one extremity of the filament is secured.
- the other parts of the lamp are omitted for the sake of clearness; the axis of the lamp is indicated by X-X.
- the main filament which is supported by the pole wire 3 and another pole wire which is not shown.
- the pole wires are housed in a common lamp cap (not shown) which is also located at the left-hand side of the screen in the drawing. All parts of the lamp are enclosed in a glass bulb in the usual manner.
- the lamp is arranged in an associated parabolic reflector in such manner that the axis X-X of the lamp coincides with the axis of the parabolic reflector.
- the focus of the paraboloid is located at F and its top is located on the left-hand side of the drawing.
- the lamp axis XX instead of coinciding with the upper edge of screen 2 is usually located 1 mm. lower.
- the filament 1 which is of the helically-wound type, is secured, at one straight extremity 5, to a horizontal lateral surface 6 of screen 2 and, at its other straight extremity 7, to the pole wire 4.
- the filament When the filament is burning, it radiates light in all directions. However, the light directed downwards is intercepted by the inner side of screen 2 and directed in upward and sideward directions in the embodiment shown.
- the height of the axis of the helical filament 1 and its diameter with respect to the height of the edges 8 and 9 of the depressed portion 10 of the screen as the case may be also with respect to the position of the lateral surfaces 6 and 11 of the screen, substantially determine the upper boundary of the dimlight beam emitted by the reflector co-operating with the lamp.
- the figure also shows that the straight extremity 7 of the filament 1 extends obliquely upwards from the turn 13 which is most adjacent the lamp cap to the pole wire 4.
- the risk of shortcircuit between the straight extremity 7 of the wire and the edge 14 of the screen 2 is rendered extremely small by providing that the distance between the projection of the part 13a, which is of the turn 13 most adjacent the lamp cap, on the axis XX of the lamp and the projection of the part 14a of the edge 14 of the screen on the said axis, which distance is indicated by a, is chosen to be larger than 0.5 mm.
- the part 12 is coated with a thin layer of metallic zirconium.
- This material not only has the desired light-absorbing properties, but also the property that it is active as a getter, thus binding any troublesome impurities in the gas-filling.
- a lamp mount for an automobile incandescent lamp comprising a first pole wire, a screen connected to said first pole wire, a filament extending along the longitudinal axis of said screen and surrounded partly by said screen, and a second pole wire having one end of said filament secured thereto, the inner end surface of said screen adjacent to said pole wires having a dull black non-reflecting portion, the remainder of said inner surface having reflecting properties, a relatively linear extremity on said one end of said filament wherein the distance between said extremity and the adjacent part of said screen is more than 0.5 mm.
Landscapes
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL332320X | 1954-03-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2869011A true US2869011A (en) | 1959-01-13 |
Family
ID=19784419
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US491164A Expired - Lifetime US2869011A (en) | 1954-03-02 | 1955-02-28 | Electric incandescent lamp for motor-car lighting |
Country Status (7)
Country | Link |
---|---|
US (1) | US2869011A (de) |
BE (1) | BE536105A (de) |
CH (1) | CH332320A (de) |
DE (1) | DE1015926B (de) |
FR (1) | FR1119898A (de) |
GB (1) | GB764944A (de) |
NL (2) | NL86347C (de) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3083315A (en) * | 1958-02-13 | 1963-03-26 | Bosch Gmbh Robert | Headlamps |
US3287587A (en) * | 1964-12-31 | 1966-11-22 | Sylvania Electric Prod | High temperature fluorescent lamp with reflector having mercury amalgamative material on its electrode stems |
US3824421A (en) * | 1971-09-09 | 1974-07-16 | Philips Corp | Electric filament lamp |
US3962596A (en) * | 1973-11-14 | 1976-06-08 | British Sealed Beams Limited | Filament shields |
US4029985A (en) * | 1976-03-24 | 1977-06-14 | General Electric Company | Rectangular headlamp filament shield |
US4594529A (en) * | 1982-12-01 | 1986-06-10 | U.S. Philips Corporation | Metal halide discharge lamp |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1237684B (de) * | 1958-04-18 | 1967-03-30 | Albert Masseron | Gluehlampe fuer Scheinwerfer |
DE1165748B (de) * | 1961-09-01 | 1964-03-19 | Rolf Mickley | Zweifadengluehlampe fuer abgeblendetes Fern- und Nahlicht in Kraftfahrzeugscheinwerfern |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US606792A (en) * | 1898-07-05 | Electric radiator | ||
US1250030A (en) * | 1917-02-03 | 1917-12-11 | Lillie E Schickerling | Electric-lamp attachment. |
US1693672A (en) * | 1926-11-22 | 1928-12-04 | Charles J Schroeder | Electric light |
US2144438A (en) * | 1937-10-06 | 1939-01-17 | Birdseye Electric Company | Tubular incandescent electric lamp |
US2158561A (en) * | 1938-06-09 | 1939-05-16 | Hygrade Sylvania Corp | Reflector bulb lamp |
US2171336A (en) * | 1938-05-02 | 1939-08-29 | Silas B Hayden | Nonglare reflector |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH265335A (fr) * | 1949-01-31 | 1949-11-30 | Valenti Martino | Lampe électrique pour phare de véhicule automobile. |
-
0
- BE BE536105D patent/BE536105A/xx unknown
- NL NLAANVRAGE7900311,A patent/NL185528B/xx unknown
- NL NL86347D patent/NL86347C/xx active
-
1955
- 1955-02-25 GB GB5703/55A patent/GB764944A/en not_active Expired
- 1955-02-26 DE DEN10268A patent/DE1015926B/de active Pending
- 1955-02-28 US US491164A patent/US2869011A/en not_active Expired - Lifetime
- 1955-02-28 FR FR1119898D patent/FR1119898A/fr not_active Expired
- 1955-02-28 CH CH332320D patent/CH332320A/de unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US606792A (en) * | 1898-07-05 | Electric radiator | ||
US1250030A (en) * | 1917-02-03 | 1917-12-11 | Lillie E Schickerling | Electric-lamp attachment. |
US1693672A (en) * | 1926-11-22 | 1928-12-04 | Charles J Schroeder | Electric light |
US2144438A (en) * | 1937-10-06 | 1939-01-17 | Birdseye Electric Company | Tubular incandescent electric lamp |
US2171336A (en) * | 1938-05-02 | 1939-08-29 | Silas B Hayden | Nonglare reflector |
US2158561A (en) * | 1938-06-09 | 1939-05-16 | Hygrade Sylvania Corp | Reflector bulb lamp |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3083315A (en) * | 1958-02-13 | 1963-03-26 | Bosch Gmbh Robert | Headlamps |
US3287587A (en) * | 1964-12-31 | 1966-11-22 | Sylvania Electric Prod | High temperature fluorescent lamp with reflector having mercury amalgamative material on its electrode stems |
US3824421A (en) * | 1971-09-09 | 1974-07-16 | Philips Corp | Electric filament lamp |
US3962596A (en) * | 1973-11-14 | 1976-06-08 | British Sealed Beams Limited | Filament shields |
US4029985A (en) * | 1976-03-24 | 1977-06-14 | General Electric Company | Rectangular headlamp filament shield |
US4594529A (en) * | 1982-12-01 | 1986-06-10 | U.S. Philips Corporation | Metal halide discharge lamp |
Also Published As
Publication number | Publication date |
---|---|
GB764944A (en) | 1957-01-02 |
BE536105A (de) | |
NL185528B (nl) | |
FR1119898A (fr) | 1956-06-26 |
DE1015926B (de) | 1957-09-19 |
NL86347C (de) | |
CH332320A (de) | 1958-08-31 |
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