US2799791A - Electric incandescent lamp comprising a reflector - Google Patents
Electric incandescent lamp comprising a reflector Download PDFInfo
- Publication number
- US2799791A US2799791A US340082A US34008253A US2799791A US 2799791 A US2799791 A US 2799791A US 340082 A US340082 A US 340082A US 34008253 A US34008253 A US 34008253A US 2799791 A US2799791 A US 2799791A
- Authority
- US
- United States
- Prior art keywords
- reflector
- lamp
- incandescent lamp
- ellipse
- 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 - Lifetime
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V7/00—Reflectors for light sources
- F21V7/04—Optical design
- F21V7/06—Optical design with parabolic curvature
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/28—Envelopes; Vessels
- H01K1/32—Envelopes; Vessels provided with coatings on the walls; Vessels or coatings thereon characterised by the material thereof
- H01K1/325—Reflecting coating
Definitions
- the main object of the invention is to provide an incandescent lamp in which the beam is non-directional in a horizontal plane and directional in a vertical plane so that the beam is clearly visible in a wide circle around the vehicle.
- an electric incandescent lamp including a filament comprises a reflector forming a portion of a surface of revolution defined by rotation of a portion of an ellipse about a line extending at right angles to the axis connecting the focal points of the ellipse and passing through one focal point, the portion of the ellipse employed to produce the reflector being located solely on that side of the line adjacent the other focal point.
- the filament of the lamp is located along the line passing through the one focal point.
- ellipse is to be understood in this case to include an ellipse in which one focal point lies at infinity, and which, consequently, is a parabola.
- the reflector may be constituted by parts of the bulb of the lamp or a member distinct from the bulb.
- Fig. 1 is a diagrammatic view of one form of incandescent lamp with cap in accordance with the invention in which reflector and lamp constitute a single assembly;
- Fig. 2 is a plan view of the lamp shown in Fig. 1;
- Fig. 3 is a diagrammatic view of another form of incandescent lamp in accordance with the invention, comprising a base plate;
- Fig. 4 shows a modification of the lamp shown in Fig. 3;
- Fig. 5 shows an incandescent lamp in accordance with the invention having a separate reflector.
- Fig. 1 shows an incandescent lamp in accordance with the invention constituted by a bulb 1 and a base 2.
- the bulb contains a filament 3 which is supported in the usual manner.
- the upper and lower parts of the bulb have the shape of portions of a surface of revolution obtained by rotation of an ellipse 4 (shown in dotted line) about an axis YY indicated by a dot-and-dash line.
- This line Y-Y passes through one focal point P1 of the ellipse and is at right angles to an axis XX connecting the two focal points of the ellipse.
- the filament 3 is also located at this focal point F1.
- the second focal point or focus of the ellipse falls outside the drawing and may be located at infinity, the ellipse then changing to a parabola.
- the shape of the bulb is determined by the figure of revolution of such parts of the ellipse as are located between the two focal points, that is to say, by revolution of the line portions AB and CD.
- These portions of the bulb are provided, either internally or externally, with a conventional type of reflecting layer, whereas the porice tions of the bulb between the circles passing through points A and D are transparent, and may be either clear or colored.
- the filament 3 preferably coincides as far as possible with the axis of revolution Y-Y thereby increasing the symmetry of the light beam being produced. Two rays 5 and 6 of this light beam are shown.
- Fig. 3 shows a modification of the invention, in which the beam exhibits a horizontal radiation pattern of 360", comprising a base plate 11, e. g. of glass.
- a plurality of pins 12 are pressed into base plate ll.
- Two such pins have welded on them wires 13 for supporting the lower end of a filament 14.
- two supporting wires are employed which are interconnected at their upper ends. If desired, one supporting wire only would suflice.
- wires 15 which carry two reflector members 16 and 17, having the shape of cups and provided with apertures through which rods 15 are passed and subsequently welded in position.
- These reflectors form portions of a surface of revolution defined by a rotating ellipse in accordance with the invention. It is evident that many variations in the manner of supporting the reflectors 1d, 17 are possible.
- a bridge 18 carrying the upper ends of filament 14 is welded between the upper ends of two rods 15 located diametrically opposite each other. The upper end of the filament extends through an aperture of the upper reflector 17.
- the filament could alternatively be connected directly to this portion of the reflector.
- the construction shown offers the advantage that the mounting and centering of the filament is simplified.
- the lamp furthermore comprises an exhaust tube, which is not shown for simplicity. If desired, one of the pins 12 may be used as such a tube.
- the lamp shown in Pig. 4 is a modification of that shown in Fig. 3 and comprises a reflector, of which one portion 31 is constituted by the bulb 32 and the other portion is constituted by a metal cup 33. This lamp otherwise substantially corresponds to that shown in Fig. 3.
- the lamp according to the invention shown in Fig. 5 externally comprises two reflector portions 41 and 42, which are connected along their flanged edges to a transparent cylindrical member 43.
- An incandescent lamp 44 proper is secured with its cap 45 in the cylindrical member 46.
- An electric incandescent lamp as claimed in claim 1 in which the other of said focal points is located at 15 p 3.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL311971X | 1952-03-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2799791A true US2799791A (en) | 1957-07-16 |
Family
ID=19783656
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US340082A Expired - Lifetime US2799791A (en) | 1952-03-04 | 1953-03-03 | Electric incandescent lamp comprising a reflector |
Country Status (7)
Country | Link |
---|---|
US (1) | US2799791A ( ) |
BE (1) | BE518131A ( ) |
CH (1) | CH311971A ( ) |
DE (1) | DE942341C ( ) |
FR (1) | FR1072116A ( ) |
GB (1) | GB728541A ( ) |
IT (1) | IT500078A ( ) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2904714A (en) * | 1958-06-16 | 1959-09-15 | Gen Electric | Electric lamp |
US3018403A (en) * | 1958-03-05 | 1962-01-23 | Westinghouse Electric Corp | Reflector lamp |
US3162785A (en) * | 1960-04-22 | 1964-12-22 | Sylvania Electric Prod | Projection lamp |
US3256456A (en) * | 1958-01-09 | 1966-06-14 | Sylvania Electric Prod | Reflector incandescent projection lamp |
US3257574A (en) * | 1960-02-11 | 1966-06-21 | Thorn Electrical Ind Ltd | Projection lamp having ellipsoidal-spherical reflector with vents therebetween |
US4280076A (en) * | 1978-10-18 | 1981-07-21 | Duro-Test Corporation | Incandescent lamp with structure for collecting evaporated filament material |
US4446397A (en) * | 1981-09-28 | 1984-05-01 | General Electric Company | High intensity discharge lamp with infrared reflecting means for improving efficacy |
US4992695A (en) * | 1989-10-10 | 1991-02-12 | Daniel Naum | Reflector for high-intensity lamps |
US5418420A (en) * | 1993-06-22 | 1995-05-23 | Ilc Technology, Inc. | Arc lamp with a triplet reflector including a concave parabolic surface, a concave elliptical surface and a convex parabolic surface |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2516204A1 (fr) * | 1981-11-06 | 1983-05-13 | Lampes Sa | Borne autonome d'eclairage |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1676300A (en) * | 1927-02-21 | 1928-07-10 | Sved Alexander | Incandescent electric lamp |
US1981329A (en) * | 1931-11-16 | 1934-11-20 | Rivier Louis | Lamp |
US1998187A (en) * | 1933-12-01 | 1935-04-16 | Eclairage Rationnel Sper Soc P | Improved optical combination |
US2110590A (en) * | 1936-09-11 | 1938-03-08 | Birdseye Electric Corp | Reflecting incandescent lamp |
US2272186A (en) * | 1939-07-19 | 1942-02-10 | Edward P Creehan | Radiant energy projector |
US2488751A (en) * | 1948-03-05 | 1949-11-22 | Gen Electric | Reflecting electric lamp |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE94157C ( ) * | ||||
DE339849C (de) * | 1919-03-06 | 1921-08-13 | Siemens & Halske Akt Ges | Lichtbogenbestrahlungslampe, die auf einer zweckmaessig in der Hoehe verstellbaren Saeule angeordnet ist |
US2362175A (en) * | 1943-03-25 | 1944-11-07 | Swanson Harold | Piped light full-beam electric lamp |
US2362172A (en) * | 1943-03-25 | 1944-11-07 | Swanson Harold | Vehicle headlight with integral full-beam electric lamps |
US2362176A (en) * | 1943-03-25 | 1944-11-07 | Swanson Harold | Flashlight full-beam electric lamp |
-
0
- IT IT500078D patent/IT500078A/it unknown
- BE BE518131D patent/BE518131A/xx unknown
-
1953
- 1953-02-27 GB GB5539/53A patent/GB728541A/en not_active Expired
- 1953-03-01 DE DEN6826A patent/DE942341C/de not_active Expired
- 1953-03-02 FR FR1072116D patent/FR1072116A/fr not_active Expired
- 1953-03-02 CH CH311971D patent/CH311971A/de unknown
- 1953-03-03 US US340082A patent/US2799791A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1676300A (en) * | 1927-02-21 | 1928-07-10 | Sved Alexander | Incandescent electric lamp |
US1981329A (en) * | 1931-11-16 | 1934-11-20 | Rivier Louis | Lamp |
US1998187A (en) * | 1933-12-01 | 1935-04-16 | Eclairage Rationnel Sper Soc P | Improved optical combination |
US2110590A (en) * | 1936-09-11 | 1938-03-08 | Birdseye Electric Corp | Reflecting incandescent lamp |
US2272186A (en) * | 1939-07-19 | 1942-02-10 | Edward P Creehan | Radiant energy projector |
US2488751A (en) * | 1948-03-05 | 1949-11-22 | Gen Electric | Reflecting electric lamp |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3256456A (en) * | 1958-01-09 | 1966-06-14 | Sylvania Electric Prod | Reflector incandescent projection lamp |
US3018403A (en) * | 1958-03-05 | 1962-01-23 | Westinghouse Electric Corp | Reflector lamp |
US2904714A (en) * | 1958-06-16 | 1959-09-15 | Gen Electric | Electric lamp |
US3257574A (en) * | 1960-02-11 | 1966-06-21 | Thorn Electrical Ind Ltd | Projection lamp having ellipsoidal-spherical reflector with vents therebetween |
US3162785A (en) * | 1960-04-22 | 1964-12-22 | Sylvania Electric Prod | Projection lamp |
US4280076A (en) * | 1978-10-18 | 1981-07-21 | Duro-Test Corporation | Incandescent lamp with structure for collecting evaporated filament material |
US4446397A (en) * | 1981-09-28 | 1984-05-01 | General Electric Company | High intensity discharge lamp with infrared reflecting means for improving efficacy |
US4992695A (en) * | 1989-10-10 | 1991-02-12 | Daniel Naum | Reflector for high-intensity lamps |
US5418420A (en) * | 1993-06-22 | 1995-05-23 | Ilc Technology, Inc. | Arc lamp with a triplet reflector including a concave parabolic surface, a concave elliptical surface and a convex parabolic surface |
Also Published As
Publication number | Publication date |
---|---|
CH311971A (de) | 1955-12-15 |
FR1072116A (fr) | 1954-09-08 |
BE518131A ( ) | |
IT500078A ( ) | |
DE942341C (de) | 1956-05-03 |
GB728541A (en) | 1955-04-20 |
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