US3609340A - Improvements in lighting units - Google Patents
Improvements in lighting units Download PDFInfo
- Publication number
- US3609340A US3609340A US816963A US3609340DA US3609340A US 3609340 A US3609340 A US 3609340A US 816963 A US816963 A US 816963A US 3609340D A US3609340D A US 3609340DA US 3609340 A US3609340 A US 3609340A
- Authority
- US
- United States
- Prior art keywords
- reflector
- lighting unit
- focal point
- cup
- elliptic
- 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
-
- 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
- F21V7/0008—Reflectors for light sources providing for indirect lighting
-
- 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
- F21V7/09—Optical design with a combination of different curvatures
Definitions
- a lighting unit consists of an elliptic rotational reflector having the light source positioned in one focal point, and a convex reflector facing the elliptic rotational reflector and serving for polydirectionally radiating the light rays which are emitted by the light source and pass through the other focal point of the elliptic rotational reflector.
- the convex reflector has at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel.
- This invention relates to a lighting unit of the type comprising an elliptic rotational reflector having the light source positioned in one focal point thereof, and a convex reflector facing the elliptic rotational reflector and preferably formed as a segment of a sphere for polydirectionally radiating the light rays which are emitted by the light source and pass through the other focal point of the elliptic rotational reflector.
- the characteristic feature of the lighting unit resides in that the convex reflector hm at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel.
- the lighting unit When devoid of a cup-shaped inwardly bulging recess, the lighting unit presents the same character of radiation in all directions.
- a lighting unit having in accordance with the invention a cup-shaped inwardly bulging recess provides a certain directional effect on the light, and this effect can be exploited for illumination of a roadway laterally of the lighting unit.
- the reflector 1 designates an elliptic rotational reflector having the light source positioned in one focal point Fl thereof.
- the reflector 1 shall be of such a size as to entirely conceal the light source.
- Mounted above the reflector l is a convex reflector 2 with the reflecting surface facing downwardly. More precisely, the reflector 2 is formed as a segment of a sphere.
- the light rays emitted by the light source are reflected by the reflector 1 through the other focal point F2 thereof towards the reflector 2 so that a polydirectional radiation is obtained within the area A-B.
- the lighting unit presents rotation symmetry around a vertical axis drawn through the focal points F1 and F2, the lighting unit being carried by a post, mast or like element so as to be adapted for use as a stationary lamp, as for example, a stationary roadside lamp for illuminating a highway.
- a clear cover of glass or plastics shall preferably be arranged between the outer peripheries of the two reflectors 1 and 2.
- the reflector 2 has at least one cup-shaped inwardly bulging recess 3 which reflects the light rays impinging thereon at least essentially parallel, thereby providing a certain directional effect on the light.
- this curve When caused to rotate about the O-X-axis, this curve will generate the inwardly bulging recess 3 in the reflector 2. The light rays impinging on this section of the reflector 2 will thus emerge from the lighting unit in parallel relationship.
- the size of the recess 3 is determined by the amount of light to be reflected by the recess. Normally, the recess 3 is given the size shown in the drawing so as to extend from the reflector center to the periphery of the reflector 2, thereby forming an annular recess reflecting a peripheral array of essentially parallel light rays.
- the angle a by which the O-X-axis is inclined in relation to the horizontal plane H is determinative of the direction in which the light emerges from the cup-shaped inwardly bulging recess 3. By changing the angle a it is thus possible to attain the desired angle of radiation of the lighting unit.
- the reflector 2 When it is desired to throw the light along a roadway in both directions as measured from the lighting unit, the reflector 2 is provided with two cup-shaped inwardly bulging recesses 3 of the above-mentioned design rather than a single annular recess 3.
- the lighting unit When the lighting unit is to be placed laterally adjacent to the roadway to be illuminated, the light should be directed slightly obliquely forwardly to cover the roadway. This is attained by causing the longitudinal axes of the two recesses 3 to be axially offset relative to each other so as to be displaced at an angle of more or less than with one another.
- the same effect can be attained by asymmetrically inclining the reflector 2 from a horizontal plane so that the reflector edge closest to the edge of the roadway is at a greater hei ht over the ground.
- e reflector 2 may very well have more than two cupshaped inwardly bulging recesses 3. For instance, with four cup-shaped inwardly bulging recesses 3 uniformly distributed over the circumference, an approximately square lighted area will be obtained on the ground.
- a lighting unit of the type comprising an elliptic rotational reflector having a light source positioned in one focal point thereof; and a convex reflector facing the elliptic rotational reflector and preferably fonned as a segment of a sphere for polydirectionally radiating the light rays which are emitted by the light source and which pass through the other focal point of the elliptic rotational reflector, said convex reflector having at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel, said cup-shaped inwardly bulging recess being defined by a generated curve yflx) the focus of which is situated in the other focal point (F2) of the elliptic rotational reflector, said curve having been caused to rotate about its axis (O-X) through the focus.
- a lighting unit as claimed in claim 1, wherein the convex reflector has two substantially diametrically opposed, cupshaped, inwardly bulging recesses.
Abstract
A lighting unit consists of an elliptic rotational reflector having the light source positioned in one focal point, and a convex reflector facing the elliptic rotational reflector and serving for polydirectionally radiating the light rays which are emitted by the light source and pass through the other focal point of the elliptic rotational reflector. The convex reflector has at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel.
Description
United States Patent [7 2] Inventor Lars Bertil Habro Lidingo, Sweden [21] Appl. No. 816,963
[22] Filed Apr. 17, 1969 [45] Patented Sept. 28, 1971 [73] Assignee AB Vagbellysning Stockholm, Sweden [32] Priority Apr. 23, 1968 [33] Sweden [54] IMPROVEMENTS IN LIGHTING UNITS 3 Claims, 1 Drawing Fig.
[52] US. Cl. 240/41.1, 240/25, 240/4135 C [51] Int. Cl F2lm 3/04 [50] Field of Search 240/4l.l
[56] References Cited UNITED STATES PATENTS 2,647,203 7/ 1953 Smith 240/4l.l
Primary Examiner-Samuel S. Matthews Assistant Examiner-Richard L. Moses Attorney-Waters, Roditi, Schwartz & Nissen ABSTRACT: A lighting unit consists of an elliptic rotational reflector having the light source positioned in one focal point, and a convex reflector facing the elliptic rotational reflector and serving for polydirectionally radiating the light rays which are emitted by the light source and pass through the other focal point of the elliptic rotational reflector. The convex reflector has at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel.
IMPROVEMENTS IN LIGHTING UNITS This invention relates to a lighting unit of the type comprising an elliptic rotational reflector having the light source positioned in one focal point thereof, and a convex reflector facing the elliptic rotational reflector and preferably formed as a segment of a sphere for polydirectionally radiating the light rays which are emitted by the light source and pass through the other focal point of the elliptic rotational reflector. The characteristic feature of the lighting unit resides in that the convex reflector hm at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel.
When devoid of a cup-shaped inwardly bulging recess, the lighting unit presents the same character of radiation in all directions. A lighting unit having in accordance with the invention a cup-shaped inwardly bulging recess provides a certain directional effect on the light, and this effect can be exploited for illumination of a roadway laterally of the lighting unit.
The invention will now be more fully described in the following, reference being made to the accompanying drawing which in cross section illustrates the reflectors of the lighting unit in a preferred embodiment thereof.
1 designates an elliptic rotational reflector having the light source positioned in one focal point Fl thereof. The reflector 1 shall be of such a size as to entirely conceal the light source. Mounted above the reflector l is a convex reflector 2 with the reflecting surface facing downwardly. More precisely, the reflector 2 is formed as a segment of a sphere.
The light rays emitted by the light source are reflected by the reflector 1 through the other focal point F2 thereof towards the reflector 2 so that a polydirectional radiation is obtained within the area A-B.
The lighting unit presents rotation symmetry around a vertical axis drawn through the focal points F1 and F2, the lighting unit being carried by a post, mast or like element so as to be adapted for use as a stationary lamp, as for example, a stationary roadside lamp for illuminating a highway. A clear cover of glass or plastics shall preferably be arranged between the outer peripheries of the two reflectors 1 and 2.
In accordance with the invention, the reflector 2 has at least one cup-shaped inwardly bulging recess 3 which reflects the light rays impinging thereon at least essentially parallel, thereby providing a certain directional effect on the light.
As will appear from the drawing, the focal point P2 of the ellipse is the focus of a curve y=f(x), for instance, a parabola. When caused to rotate about the O-X-axis, this curve will generate the inwardly bulging recess 3 in the reflector 2. The light rays impinging on this section of the reflector 2 will thus emerge from the lighting unit in parallel relationship. The size of the recess 3 is determined by the amount of light to be reflected by the recess. Normally, the recess 3 is given the size shown in the drawing so as to extend from the reflector center to the periphery of the reflector 2, thereby forming an annular recess reflecting a peripheral array of essentially parallel light rays.
The angle a by which the O-X-axis is inclined in relation to the horizontal plane H is determinative of the direction in which the light emerges from the cup-shaped inwardly bulging recess 3. By changing the angle a it is thus possible to attain the desired angle of radiation of the lighting unit.
When it is desired to throw the light along a roadway in both directions as measured from the lighting unit, the reflector 2 is provided with two cup-shaped inwardly bulging recesses 3 of the above-mentioned design rather than a single annular recess 3. When the lighting unit is to be placed laterally adjacent to the roadway to be illuminated, the light should be directed slightly obliquely forwardly to cover the roadway. This is attained by causing the longitudinal axes of the two recesses 3 to be axially offset relative to each other so as to be displaced at an angle of more or less than with one another. The same effect can be attained by asymmetrically inclining the reflector 2 from a horizontal plane so that the reflector edge closest to the edge of the roadway is at a greater hei ht over the ground.
e reflector 2 may very well have more than two cupshaped inwardly bulging recesses 3. For instance, with four cup-shaped inwardly bulging recesses 3 uniformly distributed over the circumference, an approximately square lighted area will be obtained on the ground.
The invention is not limited to the embodiment described above and shown in the drawing but can be modified within the scope of the appended claims.
What I claim and desire to secure by Letters Patent is:
l. A lighting unit of the type comprising an elliptic rotational reflector having a light source positioned in one focal point thereof; and a convex reflector facing the elliptic rotational reflector and preferably fonned as a segment of a sphere for polydirectionally radiating the light rays which are emitted by the light source and which pass through the other focal point of the elliptic rotational reflector, said convex reflector having at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel, said cup-shaped inwardly bulging recess being defined by a generated curve yflx) the focus of which is situated in the other focal point (F2) of the elliptic rotational reflector, said curve having been caused to rotate about its axis (O-X) through the focus.
2. A lighting unit as claimed in claim 1, wherein the convex reflector has two substantially diametrically opposed, cupshaped, inwardly bulging recesses.
3. A lighting unit is claimed in claim 1, wherein the axis (O-X) of the curve y=f(x) through the focus is inclined in relation to the horizontal plane.
Claims (3)
1. A lighting unit of the type comprising an elliptic rotational reflector having a light source positioned in one focal point thereof; and a convex reflector facing the elliptic rotational reflector and preferably formed as a segment of a sphere for polydirectionally radiating the light rays which are emitted by the light source and which pass through the other focal point of the elliptic rotational reflector, said convex reflector having at least one cup-shaped inwardly bulging recess which reflects the light rays impinging thereon at least essentially parallel, said cup-shaped inwardly bulging recess being defined by a generated curve y f(x) the focus of which is situated in the other focal point (F2) of the elliptic rotational reflector, said curve having been caused to rotate about its axis (O-X) through the focus.
2. A lighting unit as claimed in claim 1, wherein the convex reflector has two substantially diametrically opposed, cup-shaped, inwardly bulging recesses.
3. A lighting unit is claimed in claim 1, wherein the axis (O-X) of the curve y f(x) through the focus is inclined in relation to the horizontal plane.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE5396/68A SE308699B (en) | 1968-04-23 | 1968-04-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3609340A true US3609340A (en) | 1971-09-28 |
Family
ID=20266382
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US816963A Expired - Lifetime US3609340A (en) | 1968-04-23 | 1969-04-17 | Improvements in lighting units |
Country Status (11)
Country | Link |
---|---|
US (1) | US3609340A (en) |
AT (1) | AT285739B (en) |
BE (1) | BE731783A (en) |
CH (1) | CH501867A (en) |
DK (1) | DK123732B (en) |
FI (1) | FI49876C (en) |
FR (1) | FR2006766A1 (en) |
GB (1) | GB1234895A (en) |
NL (1) | NL6906298A (en) |
NO (1) | NO121457B (en) |
SE (1) | SE308699B (en) |
Cited By (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3983039A (en) * | 1975-03-03 | 1976-09-28 | Fusion Systems Corporation | Non-symmetrical reflector for ultraviolet curing |
US4075471A (en) * | 1974-10-17 | 1978-02-21 | Lucas Electrical Company Limited | Lamp assembly |
US4112483A (en) * | 1976-07-28 | 1978-09-05 | Optical Coating Laboratory, Inc. | Lighting fixture and method using multiple reflections |
US4174533A (en) * | 1976-10-21 | 1979-11-13 | Compagnie Des Lampes, Societe Anonyme | Waveflux concentration reflector |
FR2431090A1 (en) * | 1978-07-10 | 1980-02-08 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | ELECTRONIC FLAT APPARATUS HAVING A REFLECTOR WITH ORIENTABLE ELEMENTS |
US4194234A (en) * | 1977-09-08 | 1980-03-18 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | Simultaneous multi directional single source multiple reflector electronic photo flash unit |
US4298909A (en) * | 1978-07-10 | 1981-11-03 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | Photoflash reflector configuration |
US4310876A (en) * | 1978-06-30 | 1982-01-12 | Small Jr Edward A | Lighting fixture and method using multiple reflections |
US4583528A (en) * | 1984-11-08 | 1986-04-22 | Jack Bauman | Examining device with improved optical coupling between the light source and light conductor |
US4669449A (en) * | 1986-02-18 | 1987-06-02 | Jack Bauman | Submergible laryngoscope metallic housing for fiber optics power source |
US4679547A (en) * | 1986-02-19 | 1987-07-14 | Jack Bauman | Fluid submersible laryngoscope |
US4694822A (en) * | 1986-04-01 | 1987-09-22 | Jack Bauman | Submergible laryngoscope battery housing |
US4709312A (en) * | 1986-06-24 | 1987-11-24 | Ruud Lighting, Inc. | Floodlight with improved reflector system |
US4809147A (en) * | 1983-08-19 | 1989-02-28 | Masataka Negishi | Lighting device |
US5199782A (en) * | 1991-05-23 | 1993-04-06 | Glen Co. Breda & Associates, Inc. | Illumination system for vanity or the like |
US5501651A (en) * | 1994-06-13 | 1996-03-26 | Bauman; Jack | Fluid submersible laryngoscope preventing electrolytic current flow |
US5873646A (en) * | 1996-06-14 | 1999-02-23 | Aktiebolaget Electrolux | Lighting arrangement at a refrigerator or freezer cabinet |
US6431737B1 (en) * | 1999-03-25 | 2002-08-13 | Stanley Electric Co., Ltd. | Vehicle headlamp having multi-reflex optical system |
US6439745B2 (en) | 2000-01-14 | 2002-08-27 | Stanley Electric Co., Ltd. | Light composition for vehicle light |
US20100302510A1 (en) * | 2009-06-02 | 2010-12-02 | Seiko Epson Corporation | Light source device, illumination system, and projector |
EP2295852A3 (en) * | 2009-09-10 | 2012-06-27 | Münz, Christoph | Reflector arrangement |
-
1968
- 1968-04-23 SE SE5396/68A patent/SE308699B/xx unknown
-
1969
- 1969-04-15 CH CH573669A patent/CH501867A/en not_active IP Right Cessation
- 1969-04-16 GB GB09323/69A patent/GB1234895A/en not_active Expired
- 1969-04-17 US US816963A patent/US3609340A/en not_active Expired - Lifetime
- 1969-04-21 FI FI691159A patent/FI49876C/en active
- 1969-04-21 BE BE731783D patent/BE731783A/xx unknown
- 1969-04-22 FR FR6912665A patent/FR2006766A1/fr not_active Withdrawn
- 1969-04-22 AT AT389569A patent/AT285739B/en not_active IP Right Cessation
- 1969-04-22 DK DK220069AA patent/DK123732B/en not_active IP Right Cessation
- 1969-04-22 NO NO1649/69A patent/NO121457B/no unknown
- 1969-04-23 NL NL6906298A patent/NL6906298A/xx unknown
Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4075471A (en) * | 1974-10-17 | 1978-02-21 | Lucas Electrical Company Limited | Lamp assembly |
US3983039A (en) * | 1975-03-03 | 1976-09-28 | Fusion Systems Corporation | Non-symmetrical reflector for ultraviolet curing |
US4112483A (en) * | 1976-07-28 | 1978-09-05 | Optical Coating Laboratory, Inc. | Lighting fixture and method using multiple reflections |
US4174533A (en) * | 1976-10-21 | 1979-11-13 | Compagnie Des Lampes, Societe Anonyme | Waveflux concentration reflector |
US4194234A (en) * | 1977-09-08 | 1980-03-18 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | Simultaneous multi directional single source multiple reflector electronic photo flash unit |
US4310876A (en) * | 1978-06-30 | 1982-01-12 | Small Jr Edward A | Lighting fixture and method using multiple reflections |
US4298909A (en) * | 1978-07-10 | 1981-11-03 | Patent-Treuhand-Gesellschaft Fur Elektrische Gluhlampen Mbh | Photoflash reflector configuration |
FR2431090A1 (en) * | 1978-07-10 | 1980-02-08 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | ELECTRONIC FLAT APPARATUS HAVING A REFLECTOR WITH ORIENTABLE ELEMENTS |
US4974138A (en) * | 1983-08-19 | 1990-11-27 | Masataka Negishi | Lighting device |
US4809147A (en) * | 1983-08-19 | 1989-02-28 | Masataka Negishi | Lighting device |
US4583528A (en) * | 1984-11-08 | 1986-04-22 | Jack Bauman | Examining device with improved optical coupling between the light source and light conductor |
US4669449A (en) * | 1986-02-18 | 1987-06-02 | Jack Bauman | Submergible laryngoscope metallic housing for fiber optics power source |
US4729367A (en) * | 1986-02-18 | 1988-03-08 | Jack Bauman | Submergible laryngoscope with handle fluid sealing means |
US4679547A (en) * | 1986-02-19 | 1987-07-14 | Jack Bauman | Fluid submersible laryngoscope |
US4694822A (en) * | 1986-04-01 | 1987-09-22 | Jack Bauman | Submergible laryngoscope battery housing |
US4709312A (en) * | 1986-06-24 | 1987-11-24 | Ruud Lighting, Inc. | Floodlight with improved reflector system |
US5199782A (en) * | 1991-05-23 | 1993-04-06 | Glen Co. Breda & Associates, Inc. | Illumination system for vanity or the like |
US5501651A (en) * | 1994-06-13 | 1996-03-26 | Bauman; Jack | Fluid submersible laryngoscope preventing electrolytic current flow |
US5873646A (en) * | 1996-06-14 | 1999-02-23 | Aktiebolaget Electrolux | Lighting arrangement at a refrigerator or freezer cabinet |
US6431737B1 (en) * | 1999-03-25 | 2002-08-13 | Stanley Electric Co., Ltd. | Vehicle headlamp having multi-reflex optical system |
US6439745B2 (en) | 2000-01-14 | 2002-08-27 | Stanley Electric Co., Ltd. | Light composition for vehicle light |
US20100302510A1 (en) * | 2009-06-02 | 2010-12-02 | Seiko Epson Corporation | Light source device, illumination system, and projector |
US8506128B2 (en) * | 2009-06-02 | 2013-08-13 | Seiko Epson Corporation | Light source device, illumination system, and projector |
EP2295852A3 (en) * | 2009-09-10 | 2012-06-27 | Münz, Christoph | Reflector arrangement |
Also Published As
Publication number | Publication date |
---|---|
FI49876C (en) | 1975-10-10 |
NL6906298A (en) | 1969-10-27 |
FR2006766A1 (en) | 1970-01-02 |
DE1919199A1 (en) | 1969-11-06 |
AT285739B (en) | 1970-11-10 |
SE308699B (en) | 1969-02-24 |
DK123732B (en) | 1972-07-24 |
DE1919199B2 (en) | 1976-01-15 |
GB1234895A (en) | 1971-06-09 |
FI49876B (en) | 1975-06-30 |
CH501867A (en) | 1971-01-15 |
NO121457B (en) | 1971-03-01 |
BE731783A (en) | 1969-10-01 |
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