US3808421A - Grid for fluorescent lamp units - Google Patents

Grid for fluorescent lamp units Download PDF

Info

Publication number
US3808421A
US3808421A US00320588A US32058873A US3808421A US 3808421 A US3808421 A US 3808421A US 00320588 A US00320588 A US 00320588A US 32058873 A US32058873 A US 32058873A US 3808421 A US3808421 A US 3808421A
Authority
US
United States
Prior art keywords
grid
curve
grid according
light source
generant
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
Application number
US00320588A
Other languages
English (en)
Inventor
P Willumsen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DECORONA APS
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of US3808421A publication Critical patent/US3808421A/en
Assigned to DECORONA APS reassignment DECORONA APS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WILLUMSEN, POUL
Assigned to DECORONA APS reassignment DECORONA APS CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: DKNF 113 APS
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
    • F21V11/06—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using crossed laminae or strips, e.g. grid-shaped louvers; using lattices or honeycombs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24744—Longitudinal or transverse tubular cavity or cell

Definitions

  • the bodies further having outer convex and inner concave reflecting faces, the reflection preferably being obtained by means of metallizing these faces which are of single or double curvature and have a generant curve with a constant or increasing radius in a direction away from a light source, the center of curvature of the generant curve is placed on the side facing the interiorof the tubular body and the curve is preferably of the form y y x".
  • the smallest inner cross-sectional area of the tubular bodies are nearest to the light source.
  • the grid is constructed in such a way that the incident light rays are transmitted both through and between the tubular bodies, the grid producing a pear-shaped light distribution curve in a polar coordinate system, which curve is symmetrical about the 0 axis and extends as a closed curve below the 90 axis and tangent thereto.
  • ATENWU (WK :3 "F f SHEET 7 [IF 9 PRIOR '1 GRID FOR FLUORESCENT LAMPUNITS
  • the invention relates to a grid for fluorescent lamp units for ceiling or wall illumination.
  • a fluorescent lamp unit for use in a frame, comprising one or more light sources and a plurality of self-supporting reflector elements or grids.
  • Such grids may have a directional effect, as is known in so-called low luminance grids which direct a controlled luminous flux down towards a region of limited illumination, or they may be formed as shielding grids producing a diffuse room illumination.
  • low luminance grids all the vertical faces of the grid are formed as parabolic arches whereby the grid prevents the light sourcefrom being viewed directly,
  • the known shielding grids which consist of a plurality of plane parallel vertical faces at right angles to one another, emit a diffuse luminous flux for illuminating a room, but in this grid it is possible to see the light source itself from certain angles.
  • a grid having the properties of both a low luminance grid and a shielding grid.
  • a grid of this type is suitable both for ceiling and wall illumination unlike the heretofore known fluorescent lamp units.
  • the grid according to the invention for fluorescent lamp units for ceiling or wall illumination comprises a system of equidistant, open tubular elements having both external convex reflecting faces and internal concave reflecting faces, said faces being of single or double curvature and having a generant curve whose radius of curvature is preferably constant or increasing in a direction away from alight source, the center of curvature of the generant curve of both faces being in a direction toward the inner part of the tube, the end of the tubular element facing the light source having a smaller inner cross-sectional area, than the end turned away from the light source, the grid being constructed so that the incident luminous flux will be transmitted both through and in between the tubular elements.
  • the luminous flux from the light source will partly pass through the tubular elements, being directed down towards the object it is desired primarily to illuminate as a controlled luminous flux, and secondly a certain percentage of the luminous flux will pass the grid outside the tubular elements through the spaces therebetween, where the luminous flux will be reflectedagainst the external convex faces and leaveby the openings farthest away from thelight source as a diffuse luminous flux.
  • the grid will give the impression of a number of dark regions obtained from the tubular elements which do not reflect any light to the sides, and a number of luminant faces obtained from the luminous flux diffusedly' reflected from the external faces.
  • the grid is further characterized in that the 'individ ual elements are bodies of revolution whose generant curves are essentially parabolic segments, and in that the generant curve of the external convex face may conform to the generant curve of the internal concave face, and'particularly by the element being a body of revolution whose rotary axis forms a given angle to the main axis of a curve of the shape y p x", of which the generant curve forms part thereof.
  • the grid is specifically distinctive because the curve, part of which is the generant curve of the body of revolution is a second degree parabola. This has the advantage that the luminous'flux through the elements may be directed in a controlled manner, as it is possible to calculate mathematically or by trial and error to adjust the luminous flux through the elements.
  • the focal point of the generant curve is disposed at or adjacent the edge of the body of revolution closest to the light source. This ensures guidance of the luminous flux through the body. Furthermore, the-edge of the body farthest away from the light'source is fixed relative to the geometric height of the body by light rays originating from the edge closest to the light source and, having a given angle to the axis of the body, will specifically cut off the parabolic arches at their points farthest away from the light source. This has the advantage that the entireluminous flux which enters through theopening closest to the light source will flow out as controlled light through the opening farthest away from the light source at a desired angle.
  • a second embodiment of the grid according to the invention is characterized in that the cross section of the individual elements is formed as a planar or spherical polygen'with two sides, and in that the convex and concave faces of the elements have generant curves which are elliptical, hyperbolic or'parabolic segments, the generant curves of the faces being a second degree parabola.
  • the second embodiment is further characterized in that a focal line or focal point of a face is substantially at the edge of the element closest to the light source and opposite the respective face. This ensures positive guidance of theluminous flux from the light source into the element.
  • the grid according to said second embodiment is further distinguished in that the edge of the element farthest away from the light source .is fixed relative to the geometric height of the element by light rays originating from the edge closest to the light source and, having an inclination of a given angle such as 45 to the grid, being specifically able to cut off the parabolic arches at their points farthest away from the light source.
  • the entire luminous flux entering the element will flow out as controlled luminous flux from the face of the grid farthest away from the light source.
  • the aforesaid grids are further distinguished in that the individual elements are moulded, bonded or otherwise mounted with respect to each other so as to form a connected assembly of a given design, as determined by the desired technical light effect.
  • This has the advantage of rendering the volume of controlled light relative to the size of the element higher than the volume of passing diffuse light as the area of the spaces between the individual elements will be the smallest posible.
  • the grid is further characterized in that the individual elements are interconnected such that their geometric centers viewed from the. light source and also from the opposite side of the grid towards the light source will form a plane polygonal or spheric polygonal pattern. This ensures that the grid will havea design giving it an attractive appearance both when the illumination is on or when it is off which is essential for marketing purposes.
  • the grid is further distinguished in that the individual elements are moulded together or otherwisemounted in and interconnected by a shielding grid, known per se, having walls in plane parallel relationship and disposed at right angles, to one another. This feature makes it possible to control the ratio of the passing controlled luminous flux to the passing diffuse luminous flux.
  • the latter configuration is furthermore distinguished by the individual elements being inserted so as to have their rotary axis coincide withan X-portion removed 1 from the shielding grid, or by the individual elements being so inserted as to have their rotary axis coincide with the intersecting line'of the horizontal diagonals of the individual openings 'of Y the shielding grid.
  • the shielding grid will not prevent any portion of the luminous flux from reaching the opening of the elements closest to the light source, and it is-also ensured that the highest possible percentage of the luminous flux from the light source will reach the shielding grid, and it has further been possible to reduce the'number of reflections prior to the diffuse luminous flux leaving the face of the grid farthest away from the light source.
  • the grid is also distinguished by being made from a material capable of being'formed into sheets, for example plastics.
  • the material also may be glass or metal although this is not expedient as it will add too much weight to the grid.
  • plastics permits the grid to be made by a simple operation such as moulding.
  • the grid is distinguished by a reflecting coating consisting in metallizing the surface of the material, or in an inherently double-reflecting face coated with a transparent face coated with a transparent material on one or both sides. It is recommended in the preferred embodiment to metallize the surface of the material as this involves the least luminous loss.
  • a coloring matter may be added. This ensures that the controlled luminous flux transmitted from the light source towards the primarily illuminated object will be as high as possible, whereas the toning obtained by adding a coloring matter will dim the diffuseluminous flux slightly such that the diffuse luminous flux will not be felt as a cold reflected light but rather as a warm and pleasant room illumination.
  • the grid is also distinguished by a configuration permitting the light transmitted to spread as a controlled luminous flux like low luminance grids known per se, i.e. grids where the lateral face is substantially parabolic, and also to spread as a difiuse luminous-flux like the distribution of luminous flux 'in shielding grids known per se, i.e. grids where the lateral face has substantially plane parallel faces, and by having a light distribution curve basically as shown in FIG. 11 and further described below.
  • the grid is distinguished by a light distribution curve in a polar. coordinate system in symmetrical about the 0 axis, extending as a closed curve below the axis and with the latter as a horizontal tangent, and being otherwise a substantially pear-shaped curve having a marked indentation in the upper portion of the pear-shaped curve, which means that the pear-shaped curve has two deflection tangents on either side of the axis of symmetry in the upper portion of pear-shaped curve, or by the light distribution curve being shaped as a pear section having an enlarged extension of its stalk.
  • FIG. 1 illustrate a grid for fluorescent lamp units for ceiling illumination or as wall unit according to the invention, viewed in section along the line [-1 in FIG. 2,
  • FIG. 2 shows the grid in FIG. 1, viewed from the light source
  • FIG. 3 is a second grid according to the invention, viewed in section along the line III-III in FIG. 4,
  • FIG. 4 shows the grid in'FIG. 3, viewed fromthelight source
  • FIG. 5 shows the construction of a body of revolution for the lamp unit in FIG. 1, designated V, and the construction of the faces of FIG. 3.
  • FIG. 6 shows the light transmission through a parabola ,of revolution as used in the grid
  • FIG.v 7 shows the light distribution of an unshielded fluorescent lamp
  • FIG. 8 shows two light distribution curves of fluorescent lamp units where the grid consists of plane parallel facesoriented substantially away from the light source toward the object illuminated
  • FIG. 9 shows a light distribution curve for a unit with I experiments at the Lighting Engineering Laboratory
  • FIG. 11 shows alight distribution curve derived from experiments at the Lighting Engineering Laboratory having the characteristic configuration of the light distribution curve for the grid according to the invention.
  • FIGS. 1 and 2 show a grid 1 according to the invention where the numeral 2 designates bodies of revolution or elements having both external, convex reflecting faces 3 and internal, concave reflecting faces 4.
  • the individual elements 2 are secured to or moulded integrally with a shielding grid which consists of a plurality of walls 6, 7 at right angles to one another.
  • a shielding grid which consists of a plurality of walls 6, 7 at right angles to one another.
  • every second wall 6, 7 is continuous and every second wall 6, 7 interrupted'by elements 2. All faces of walls 6, 7 are reflecting.
  • the walls 6', 7 are shorter in length that the elements 2, extending from the edge B farthest away from the light source 5.
  • the elements 2 may also be mounted within the rectangular squares of the shielding body withthe rotary axis of the elements coinciding with the intersection of diagonals such as in a chessboard pattern. If necessary, the shielding grid may be left out altogether, and the individual elements may be joined and secured at the edge B farthest away from the light source 5.
  • the elements 2 are bodies of revolution having a generant curve whose radius of curvature increases in a direction away from the light source 5 and with the center of curvature of their generant curve in a direction toward the interior of the tube.
  • the generant curve of the configuration specifically shown here are parabolic segments of a second degree parabola. The generant curve and the construction of theelements will be further described below. i
  • FIG. 3 and 4 show a second embodiment of the grid according to the invention.
  • the grid 1 is composed of a plurality of elements 2' having a square cross section and being interconnected at the edge farthest away from the light source.
  • the faces 3, 4' of the elements 2 are reflecting and of single curvature in the example shown, having a generant curve whose radius of curvature is increasing in a direction away from the light source 5 and with the center of curvature of the generant curve in a direction toward the interior of the tube.
  • the generant curves of the embodiment shown here are parabolic'segments of a second degree parabola.
  • adjoining comers of the individual faces 3', 4' resemble in shape hiproofs of arched configuration.
  • the aforesaid shielding grid is left out as in each individual square the external convex faces of the individual elements form a shielding grid section of substantially the same technical light effect as a corresponding square in a shielding grid of conventional construction.
  • the structures illustrated here are moulded from plastics in large or small sections and thereafter assembled and bonded together.
  • the finished grid is then metallized on all faces with a highly reflecting material such as aluminum, whereupon, if desired, the grid is immersed into a suitable pickle bath to render the reflecting face resistant to corrosion, etc-Another method consists in constructing the grid from reflecting faces and coating these with a transparent material such as a clear plastic material. The latter method will, however, result in a somewhat more'costly and heavier unit and therefore is not preferred.
  • the spaces 8, 8' between the elements may be covered with a transparent sheet of a material such as plastic or glass to which a coloring matter has been added.
  • An alternative procedure for dimming the luminous flux between the elements comprises adding to the metallizing coat for the external faces 3, 3 of the elements a coloring matter'and also to the plan parallel walls 6, 7 at right-angles to one another.
  • FIG. 5 shows the construction of the generant curve of the faces 3, 4 and 3' and 4'.
  • a parabola P of the configuration y p x is drawn in conventional manner.
  • the focal point B of the parabola there is drawn a line at the angle V to the main axis, which line intersects the parabola P at B
  • the center normal C of B, and B is drawn, and the parabolic segment 8 D, is reflected with the center normal C as axis of symmetry on to B,D,.
  • the edge closest to the light source 5, 5 is determined by the line B,B while the edge farthest away from the light source 5, 5 may be determined by drawing lines from B, and B of the angle V to the'center normal.
  • FIG. 6 illustrates an optical system having the characteristic that light hitting the upper surface of the system at any angle of incidence will be able to'leave the lower surface of the system at an angle to a vertical line which is always less or equal to V.
  • the system consists of opposing reflecting faces whose vertical sectional lines form parabolas P, and P These parabolas are symmetrical about the vertical axis of the system as explained above. In a rotary symmetrical system it is possible to have the parabolas cover each other.
  • the parabola P has the focal point B and the axis A, forming the angle V to the vertical axis.
  • the parabola P being symmetrical to P, is so positioned as to pass through the focal point B, of the parabola P,.
  • thefoacl' point B, of the parabola P must'therefore be on the parabola P,.
  • An imaginary light source is placed at the focal point B,'.
  • the rays from this light source hitting the opening B of the system will readily be seen to leave the system in directions forming an angle to thevertical axis which is less than V. All rays from B, hitting the parabola P, will be reflected in a direction forming the angle V to the vertical axis. Rays from B, hitting the parabola P,
  • the Lighting Engineering Laboratory, the Technical University of Denmark, the Technical High School of Denmark has measured the photometric characteristics of the optical grid according to the invention.
  • the principle of measuring' is further described in the publication Lampetten" No. 4/1967 issued by the Lighting Engineering Society, Denmark on pages 79 to 88.
  • the principle of the method of measuring depends on using a special photocell of at least the same size as the lamp and which is designed so as to be sensitive onlyto light hitting the surface thereof atright angles, which will, among other things, makeit possible to reduce the distance from the lamp to the measuring photocell.
  • a photocell being only sensitive to incident light at right angles will measure the true luminous-power of the lamp, provided the photocell is of at least the same sideof which is a grid permitting passageway light hitting the grid within a very small angle to the normal.
  • the light penetrating the grid into the cavity is reflected by the white faces thereof, summated and measured by a photomultiplier.
  • a special guiding raster is used, comprising eight layers, each about 1 cm deep andeach provided with a hole onthe surface facing the light source. The openings are centered with respect to each other so as to guide a light ray from the lamp toward the photocell].
  • the measuring itself is effected by the photocell being rotated 36 about the centrally positioned lamp. It should be mentioned that the Commision International d Eclarage comite E-2.2. Photometric Requirements for Luminaries have accepted the measuring principle.
  • the grid was positioned such that its plane formed an angle of 45 to the photocell, and the transmission factor and light distribution curve of the grid were measured.
  • FIGS. 7, 8 and 9 show light distribution curves for a fluorescent lamp without mounting unit and also for ordinary heretofore used fluorescent lamp units.
  • FIGS. 7 to 9 have been reproduced from Lys og Belysning (Lighting and Illumination) Nos. 3, 4 and 5, published by Aschehoug Dansk Forlag", Copenhagen 1967/1968, respectively pages 3-29, 5-25 and 4-10. It will be evident from FIGS. 8 and 9 that the light distribution curves of the heretofore customary fluorescent lamp units are substantially con vex.
  • the grid according to the inv'ention will be seen to have a light distribution curve which is substantially pear-shaped with a marked deformation of the upper portion of the pear-shape curve, and in fact such, that the pear-shaped curve has two inflections on either side of the axis of symmetry in the upper portion'of the pear-shaped curve, and that the pear configurationhas a bulge at its stalk.
  • the report on the test received from the Lighting Engineering Laboratory reads as follows:
  • Object Integral silvered grid, manufacturer Poul Willumsen. Scope of test: Measuring of photometric characteristics of optical grid.
  • a grid used below a lamp unit will, in addition to the transmission of light, also reflect the unit. The light reflected will travel back to the lamp unit and therefore 'to a certain extent hit the grid again and be transmitted.
  • the light distribution curve of the incident flux on the grid has been drawn such that the maximum luminous power is equal to 10 divisions. Based on this determination of the scale ratio, the light distribution curves of the grids have been drawn.
  • the transmission factor of the grid is 55 percent.
  • the distributions of light measured are attached in graphic form.
  • a grid for fluorescent lamp units for ceiling or wall illumination which comprises a system of equidistantly spaced open tubular elements having both external convex reflecting faces and internal concave reflecting faces, said faces being at least of single curvature and having a generant curve whose radius of curvature is constant or increasing in a direction away from a light source, the center of curvature of said generant curve of both faces being in a direction toward the interior of said tube, the end of said tubular elementfacing said light source having a smaller inner cross-sectional area than, the end away from Said light source, said grid being so constructed that the incident luminous flux 2.
  • a grid according to claim 1 wherein said generant curves are substantially parabolic segments, said generant curve of said external convex face conforming to said generant curve of said internal concave face.
  • each said tubular element is a body of. revolution whose rotary axis forms a given angle (V) to the main axis (A) of a curve of the configuration y p x" of which said generant curve forms part thereof.
  • tubular elements have a cross section formed as a planar or spherical polygon with at least two sides.
  • a grid according to claim 1 comprising a reflecting coating on said tubular elements.
  • a grid according to claim 1 having light distribution curve in a polar coordinate system symmetrical about the 0 axis, extending as a closed curve below the axis with the latter as its horizontal tangent and having a humped portion just below the 90 axis, and being a substantially pear-shaped curve with a marked indentation in the upper portion of the pear-shaped curve, such that the pear-shaped curve has two inflections on either side of the axis of symmetry in the upper portion of the pearshaped curve.
  • a grid according to claim 1 having a light distribution curve shaped as a pear section having an enlarged extensionat its stalk.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Optical Elements Other Than Lenses (AREA)
US00320588A 1972-01-04 1973-01-02 Grid for fluorescent lamp units Expired - Lifetime US3808421A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK2772A DK130937C (da) 1972-01-04 1972-01-04 Gitter til belysningsarmatur

Publications (1)

Publication Number Publication Date
US3808421A true US3808421A (en) 1974-04-30

Family

ID=8088914

Family Applications (1)

Application Number Title Priority Date Filing Date
US00320588A Expired - Lifetime US3808421A (en) 1972-01-04 1973-01-02 Grid for fluorescent lamp units

Country Status (6)

Country Link
US (1) US3808421A (da)
DE (1) DE2263803B2 (da)
DK (1) DK130937C (da)
GB (1) GB1390344A (da)
MY (1) MY8400236A (da)
SE (2) SE400359C (da)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147761A (en) * 1990-06-11 1992-09-15 W. R. Grace & Co.-Conn. Method for preparing relief image printing plates
US6164800A (en) * 1996-01-17 2000-12-26 Nsi Enterprises, Inc. Reflective materials for manufacture of reflective lighting elements including parabolic louvers and the like
EP1154200A3 (de) * 2000-05-10 2002-10-16 Regent Beleuchtungskörper AG Lichtverteiler für eine Leuchteinrichtung sowie Leuchteinrichtung und Verwendung einer Leuchteinrichtung
US20130294076A1 (en) * 2011-10-28 2013-11-07 Tobias Grau Light fixture
CN104141905A (zh) * 2013-05-07 2014-11-12 苏州欧普照明有限公司 一种灯具

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK130937C (da) * 1972-01-04 1982-07-05 Decorona Aps Gitter til belysningsarmatur
DE3831205A1 (de) * 1988-09-14 1990-03-22 Licentia Gmbh Verfahren zur herstellung eines leuchtenrasters

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839671A (en) * 1956-01-13 1958-06-17 Harry H Shearin Light-diffusing unit
US2937265A (en) * 1958-02-10 1960-05-17 Blitzer Bud Cellular lighting element and means for supporting the same
US3124310A (en) * 1964-03-10 lipscomb
US3246138A (en) * 1963-06-11 1966-04-12 Lightolier Inc Low brightness louver for lighting fixture
US3600570A (en) * 1967-12-11 1971-08-17 Mitsubishi Rayon Co Low glare louver
US3708381A (en) * 1970-07-06 1973-01-02 R Schwartz Interconnecting means for modular closed louver panel system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1017104B (de) * 1953-06-15 1957-10-10 Franz Zwick Abschirmgitter fuer Lichtquellen
GB993402A (en) * 1960-08-25 1965-05-26 Reginald Henry Bone Improvements in or relating to light shielding means and the like
DE1597908A1 (de) * 1967-01-14 1970-08-27 Acker Norbert Karl Raumbeleuchtung
DE1984108U (de) * 1968-01-13 1968-04-25 Guenther Gubela Raster zur anordnung vor beleuchtungsquellen.
FR1570726A (da) * 1968-04-30 1969-06-13
DE1935378A1 (de) * 1969-07-11 1971-01-21 Ernst Duellmann Kg Lichtraster fuer Leuchten mit stabfoermigen Lichtquellen
DK130937C (da) * 1972-01-04 1982-07-05 Decorona Aps Gitter til belysningsarmatur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3124310A (en) * 1964-03-10 lipscomb
US2839671A (en) * 1956-01-13 1958-06-17 Harry H Shearin Light-diffusing unit
US2937265A (en) * 1958-02-10 1960-05-17 Blitzer Bud Cellular lighting element and means for supporting the same
US3246138A (en) * 1963-06-11 1966-04-12 Lightolier Inc Low brightness louver for lighting fixture
US3600570A (en) * 1967-12-11 1971-08-17 Mitsubishi Rayon Co Low glare louver
US3708381A (en) * 1970-07-06 1973-01-02 R Schwartz Interconnecting means for modular closed louver panel system

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5147761A (en) * 1990-06-11 1992-09-15 W. R. Grace & Co.-Conn. Method for preparing relief image printing plates
US6164800A (en) * 1996-01-17 2000-12-26 Nsi Enterprises, Inc. Reflective materials for manufacture of reflective lighting elements including parabolic louvers and the like
US6301770B1 (en) * 1996-01-17 2001-10-16 Nsi Enterprises, Inc. Method for forming lighting sheet
EP1154200A3 (de) * 2000-05-10 2002-10-16 Regent Beleuchtungskörper AG Lichtverteiler für eine Leuchteinrichtung sowie Leuchteinrichtung und Verwendung einer Leuchteinrichtung
US20130294076A1 (en) * 2011-10-28 2013-11-07 Tobias Grau Light fixture
CN104141905A (zh) * 2013-05-07 2014-11-12 苏州欧普照明有限公司 一种灯具
CN104141905B (zh) * 2013-05-07 2016-09-07 苏州欧普照明有限公司 一种灯具

Also Published As

Publication number Publication date
MY8400236A (en) 1984-12-31
DK130937C (da) 1982-07-05
DK130937B (da) 1975-05-05
SE400359C (sv) 1979-10-08
GB1390344A (en) 1975-04-09
DE2263803A1 (de) 1973-07-12
SE7708167L (sv) 1977-07-14
SE400359B (sv) 1978-03-20
DE2263803B2 (de) 1977-07-21

Similar Documents

Publication Publication Date Title
US7178949B2 (en) Lighting equipment
US3721818A (en) Ceiling mounted luminaire and light-transmitting enclosure therefor
US4118763A (en) Variable transmission prismatic refractors
US2908197A (en) Wide angle lenses
US2474317A (en) Light refracting and transmitting
CN101614364B (zh) 用于电灯器具的透镜组件
US2506951A (en) Foraminous sheet material and luminaire made therefrom
US4703405A (en) Glare reducing lens
US6578983B2 (en) Tubular lamp luminaire with convex and concave reflector sides
US12000563B2 (en) Lighting system and artificial window
US3808421A (en) Grid for fluorescent lamp units
US3668381A (en) Prismatic light louver
US4538216A (en) Lighting apparatus
CA2374023C (en) Light
GB2070222A (en) Lamp unit for a vehicle
US3395273A (en) Refractor street lighting luminaire
US5436762A (en) Glass for an optical signalling device, the glass being fitted with non-catadioptric elements
CN212841371U (zh) 透镜、光学模组、光电模组及吸顶灯
US3202814A (en) Lighting device for dispelling shadows
US3377479A (en) Signal searchlight with end plate carrying optical directional means and with diaphragms arranged in the inner path of rays to eliminate phantom light caused by inner reflection
US3700882A (en) Faceted reflector
EP0860652A2 (en) Vehicle signal lamp
JPH07311893A (ja) 信号表示器
US3413460A (en) Optical anti-dazzling device
US3098612A (en) Lighting fixtures

Legal Events

Date Code Title Description
AS Assignment

Owner name: DECORONA APS

Free format text: CHANGE OF NAME;ASSIGNOR:DKNF 113 APS;REEL/FRAME:003858/0277

Effective date: 19810409

Owner name: DECORONA APS, MORTONSVEJ 11, DK-2800 LYNGBY, DENMA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WILLUMSEN, POUL;REEL/FRAME:003858/0279

Effective date: 19810422

Owner name: DECORONA APS, DENMARK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WILLUMSEN, POUL;REEL/FRAME:003858/0279

Effective date: 19810422