US3654455A - Luminaire - Google Patents
Luminaire Download PDFInfo
- Publication number
- US3654455A US3654455A US851671A US3654455DA US3654455A US 3654455 A US3654455 A US 3654455A US 851671 A US851671 A US 851671A US 3654455D A US3654455D A US 3654455DA US 3654455 A US3654455 A US 3654455A
- Authority
- US
- United States
- Prior art keywords
- reflector
- light
- luminaire
- housing
- angular range
- 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
- F21V5/00—Refractors for light sources
- F21V5/02—Refractors for light sources of prismatic shape
-
- 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
- F21V13/00—Producing particular characteristics or distribution of the light emitted by means of a combination of elements specified in two or more of main groups F21V1/00 - F21V11/00
- F21V13/02—Combinations of only two kinds of elements
- F21V13/04—Combinations of only two kinds of elements the elements being reflectors and refractors
-
- 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
- F21V7/0091—Reflectors for light sources using total internal reflection
Definitions
- Glass reflectors are presently available which operate primarily upon the principal of total reflection at the prismatic surfaces of the reflector which extends around the luminaire light source. These prismatic glass reflectors are usually surrounded by a metallic cover which serves to protect the glass member against breakage.
- These prismatic reflectors have general application in either surface mounted or built-in luminaires to be used in industrial buildings which have low ceilings. Since these luminaires are generally used in combination with high intensity light sources such as mercury, metallic additive, high pressure sodium or incandescent lamps in gymnasiums, supermarkets and the like, the problem of viewer glare is of prime importance.
- FIG. 1 is a partial cross-sectional elevational view of a luminaire according to the present invention
- FIG. 2 is a partial cross-sectional view of the glass reflector and metallic cover portion of the luminaire taken from axis llII of FIG. 1 but without the housing surface being coated with light absorbent means.
- FIG. 3 is a view similar to FIG. 2 with the luminaire housing being constructed in accordance with the present invention.
- the structure of the presently preferred luminaire fixture is defined in U.S. Pat. No. 2,710,340.
- the luminaire is comprised of the following primary components: a light source indicated at L, a prismatic ribbed glass reflector 20 and an aluminum cover 10.
- a socket and mounting bracket 11 retains the cover 10, reflector 20 and light source 2 in assembly and provides support from the mounting surface, not shown.
- the reflector 20 is provided with vertical light reflecting ribs 21 in the form of prisms. (FIGS. 1 and 2).
- the prismatic reflecting ribs 21 are designed so that rays emitted by the light source L (A,B,C) will be reflected by these prisms in a downward direction to strike a horizontal surface such as a floor throughout a predetermined angular range. For low ceiling, industrial uses, this range is normally to 60 from the vertical (A', B, C). Since the normal viewing angular range of a person in a store or gymnasium is seldom beyond the angular range of from 0 to 30, above the horizontal, theoretically no light would be distributed from the luminaire into the observers eyes.
- Ray S in FIG. 1 which is incident on the prism peak or valley of the prismatic reflector 20 is scattered into rays S, S and S (shown diagrammatically), by the metallic cover 10. Since none of these scattered rays can be emitted from the luminaire within the viewing range, these rays either being again reflected by the opposite side of the reflector or passing beneath the opposite edge thereof, this scattered light cannot result in viewer glare since in either instance it will be emitted from the luminaire within the desired angular range.
- the aluminum cover according to the present invention is dipped in caustic soda to clean the surface by removing foreign materialand the aluminum oxide film and then the lower portion thereof (below this horizontal plane) is blackened with black paint 30 to thereby provide an area of light absorption to substantially reduce reflection of light at glare angles. For maximum reduction of glare, the entire lower portion below this horizontal plane will be blackened.
- the present invention has achieved a substantial refinement in comfort control by producing prismatic reflectors that reduce brightness in the glare zone as much as 75 percent while reducing the efficiency of the fixture by less than 10 percent.
- the following chart illustrates this optical refinement by comparing a standard luminaire and the same luminaire made in accordance with the present invention.
- a luminaire comprising a light source and a reflector
- said reflector including a plurality of elongated prisms for reflecting light incident thereon outwardly from said luminaire within a predetermined angular range, said prisms having peaks and valleys, a portion of the light incident on said peaks and valleys being transmitted therethrough as light leakage, a housing surrounding said reflector, said housing reflecting a portion of said light leakage, at least a portion of the surface of said housing adjacent said reflector including means for absorbing light incident thereon.
- a luminaire comprising a light source and a reflector
- said reflector including a plurality of elongated prisms for reflecting light incident thereon outwardly from said luminaire within a predetermined angular range, said prisms having peaks and valleys, a portion of the light incident on said peaks and valleys being transmitted therethrough as light leakage, a housing surrounding said reflector said housing reflecting a portion of said light leakage within said predetermined range and having light absorbing means over a portion of it from which a part of the light leakage would be reflected outside said predetermined angular range.
- said absorbing means includes a black film on said housing.
- a luminaire comprising a light source and a downwardly open, bowl shaped reflector, the reflector including a plurality of elongated prisms on its surface remote from the light source, said prisms reflecting light incident thereon outwardly from the luminaire through the open bottom of the reflector and within a predetermined low angular range, said prisms having peaks and valleys, a portion of the light incident on said peaks and valleys being transmitted therethrough as light leakage, a housing surrounding said reflector, said housing being reflective over an upper portion of 1t from which sai light leakage is reflected through the open bottom of the reflector and within said predetermined angular range and having light absorbing means over a lower annular portion of its interior surface from which said light leakage would be, but for said light absorbing means, reflected through said open bottom of the reflector and above said predetermined angular range.
Abstract
Description
Claims (8)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US85167169A | 1969-08-20 | 1969-08-20 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3654455A true US3654455A (en) | 1972-04-04 |
Family
ID=25311363
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US851671A Expired - Lifetime US3654455A (en) | 1969-08-20 | 1969-08-20 | Luminaire |
Country Status (2)
Country | Link |
---|---|
US (1) | US3654455A (en) |
CA (1) | CA925064A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3798444A (en) * | 1973-04-05 | 1974-03-19 | Dominion Auto Access | Lamp construction |
EP0457645A2 (en) * | 1990-05-15 | 1991-11-21 | Francis David | Lighting device |
US5237449A (en) * | 1991-01-29 | 1993-08-17 | Nelson Optics Company, Inc. | Biased lenticular sign system |
WO2005124227A1 (en) * | 2004-06-22 | 2005-12-29 | Acrilux S.P.A. | Method used to modify the photometrics of a prismatic transparent diffuser |
US20090214828A1 (en) * | 2008-02-26 | 2009-08-27 | Vicki Herzl Watkins | Blunt tip prism film and methods for making the same |
WO2010049288A1 (en) * | 2008-10-28 | 2010-05-06 | Osram Gesellschaft mit beschränkter Haftung | The present invention relates to a lamp, particularly a short-arc discharge lamp or an incandescent lamp having a reflector |
US20190353324A1 (en) * | 2018-05-17 | 2019-11-21 | Amerlux Llc | Linear optic and led lighting fixture |
IT201900021057A1 (en) * | 2019-11-13 | 2021-05-13 | Iguzzini Illuminazione | Recessed lighting fixture. |
WO2021094916A1 (en) * | 2019-11-13 | 2021-05-20 | Iguzzini Illuminazione S.P.A. | Built-in lighting apparatus |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1267882A (en) * | 1917-08-02 | 1918-05-28 | Harrison D Mcfaddin | Hand-lamp for therapeutic purposes. |
US2202590A (en) * | 1937-04-22 | 1940-05-28 | John A Korengold | Lighting shade |
US2663794A (en) * | 1948-06-09 | 1953-12-22 | Patent License Corp | Vehicle light controlling lens panel |
US2710340A (en) * | 1954-03-29 | 1955-06-07 | Holophane Co Inc | Lighting fixtures |
US2818500A (en) * | 1953-07-03 | 1957-12-31 | Holophane Co Inc | Prismatic reflectors |
-
1969
- 1969-08-20 US US851671A patent/US3654455A/en not_active Expired - Lifetime
-
1970
- 1970-08-14 CA CA090976A patent/CA925064A/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1267882A (en) * | 1917-08-02 | 1918-05-28 | Harrison D Mcfaddin | Hand-lamp for therapeutic purposes. |
US2202590A (en) * | 1937-04-22 | 1940-05-28 | John A Korengold | Lighting shade |
US2663794A (en) * | 1948-06-09 | 1953-12-22 | Patent License Corp | Vehicle light controlling lens panel |
US2818500A (en) * | 1953-07-03 | 1957-12-31 | Holophane Co Inc | Prismatic reflectors |
US2710340A (en) * | 1954-03-29 | 1955-06-07 | Holophane Co Inc | Lighting fixtures |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3798444A (en) * | 1973-04-05 | 1974-03-19 | Dominion Auto Access | Lamp construction |
EP0457645A2 (en) * | 1990-05-15 | 1991-11-21 | Francis David | Lighting device |
EP0457645A3 (en) * | 1990-05-15 | 1992-02-26 | Francis David | Lighting device |
US5237449A (en) * | 1991-01-29 | 1993-08-17 | Nelson Optics Company, Inc. | Biased lenticular sign system |
WO2005124227A1 (en) * | 2004-06-22 | 2005-12-29 | Acrilux S.P.A. | Method used to modify the photometrics of a prismatic transparent diffuser |
US20090214828A1 (en) * | 2008-02-26 | 2009-08-27 | Vicki Herzl Watkins | Blunt tip prism film and methods for making the same |
WO2010049288A1 (en) * | 2008-10-28 | 2010-05-06 | Osram Gesellschaft mit beschränkter Haftung | The present invention relates to a lamp, particularly a short-arc discharge lamp or an incandescent lamp having a reflector |
US20190353324A1 (en) * | 2018-05-17 | 2019-11-21 | Amerlux Llc | Linear optic and led lighting fixture |
US10731825B2 (en) * | 2018-05-17 | 2020-08-04 | Amerlux Llc | Linear optic and LED lighting fixture |
US11143380B2 (en) | 2018-05-17 | 2021-10-12 | Amerlux Llc | Linear optic and LED lighting fixture |
IT201900021057A1 (en) * | 2019-11-13 | 2021-05-13 | Iguzzini Illuminazione | Recessed lighting fixture. |
WO2021094916A1 (en) * | 2019-11-13 | 2021-05-20 | Iguzzini Illuminazione S.P.A. | Built-in lighting apparatus |
CN114729732A (en) * | 2019-11-13 | 2022-07-08 | 伊古齐尼照明有限公司 | Built-in lighting equipment |
Also Published As
Publication number | Publication date |
---|---|
CA925064A (en) | 1973-04-24 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HOLAPHANE COMPANY, INC., A CORP. OF DE. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MANVILLE SALES CORPORATION, A CORP. OF DE;REEL/FRAME:005125/0574 Effective date: 19890630 |
|
AS | Assignment |
Owner name: MANVILLE SERVICE CORPORATION Free format text: MERGER;ASSIGNOR:MANVILL SALES CORPORATION;REEL/FRAME:005253/0520 Effective date: 19890605 Owner name: MANVILLE BUILDING MATERIALS CORPORATION (MERGED IN Free format text: MERGER;ASSIGNOR:MANVILL SALES CORPORATION;REEL/FRAME:005253/0520 Effective date: 19890605 Owner name: MANVILLE PRODUCTS CORPORATION Free format text: MERGER;ASSIGNOR:MANVILL SALES CORPORATION;REEL/FRAME:005253/0520 Effective date: 19890605 Owner name: JOHNS-MANVILLE SALES CORPORATION (CHANGED TO) Free format text: MERGER;ASSIGNOR:MANVILL SALES CORPORATION;REEL/FRAME:005253/0520 Effective date: 19890605 |
|
AS | Assignment |
Owner name: WELLS FARGO BANK, N.A., AS AGENT, CALIFORNIA Free format text: FIRST AMENDMENT TO PATENT SECURITY AGREEMENT AND SECOND AMENDMENT TO SUPPLEMENTAL PATENT SECURITY AGREEMENT;ASSIGNOR:HOLOPHANE CORPORATION, SUCCESSOR BY MERGER TO HOLOPHANE LIGHTING, INC., A DELAWARE CORPORATION;REEL/FRAME:007534/0221 Effective date: 19950331 |
|
AS | Assignment |
Owner name: HOLOPHANE CORPORATION (SUCCESSOR BY MERGER TO HOLO Free format text: RELEASE OF PATENT AGREEMENTS;ASSIGNOR:WELLS FARGO BANK, N.A., AS AGENT;REEL/FRAME:009314/0787 Effective date: 19980323 |