EP0430776A1 - Strahlung reflektierender Spiegel, insbesondere für Beleuchtungseinheiten - Google Patents

Strahlung reflektierender Spiegel, insbesondere für Beleuchtungseinheiten Download PDF

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Publication number
EP0430776A1
EP0430776A1 EP90403309A EP90403309A EP0430776A1 EP 0430776 A1 EP0430776 A1 EP 0430776A1 EP 90403309 A EP90403309 A EP 90403309A EP 90403309 A EP90403309 A EP 90403309A EP 0430776 A1 EP0430776 A1 EP 0430776A1
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EP
European Patent Office
Prior art keywords
arcs
ellipses
section
dome
reflector according
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.)
Withdrawn
Application number
EP90403309A
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English (en)
French (fr)
Inventor
Pierre Malifaud
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Individual
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Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0430776A1 publication Critical patent/EP0430776A1/de
Withdrawn legal-status Critical Current

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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
    • F21V7/04—Optical design
    • F21V7/09—Optical design with a combination of different curvatures

Definitions

  • the present invention relates to a lighting reflector intended to be associated with a radiation source.
  • the invention is, but not exclusively, particularly suitable for the use of a source having a small emissive body, such as short-arc, xenon or metal halide lamps.
  • one immoderly increases the dimensions of the reflector; its surface is provided with dispersive elements or it is made diffusing. Often, too, the source is shifted in the reflector so that an image is formed outside the unwanted areas.
  • the reflector is most commonly a spherical mirror and the source is offset from its center.
  • Such devices are often very bulky. They cause significant yield losses. They are able to control the opening angles of the lighting produced, which also makes them dazzling.
  • One of their major drawbacks, in the most common case where the radiation source is offset, is to pass the reflected radiation through only one image or a pseudo-image of the source, which leaves the risk of damaging concentration during slightest adjustment and what harms the homogeneity of the flow obtained by favoring a particular area of concentration. This drawback is particularly significant when the reflector is associated with a frustoconical mirror collecting the reflected flux and responsible for guiding it while ensuring optimal distribution.
  • the invention generally relates to a lighting reflector comprising a reflective dome with toroidal-ellipsoidal curvature generated by the revolution of two arcs of ellipses off-center relative to the optical axis of the source.
  • the dome being of a design particularly suitable for association with a frustoconical mirror.
  • the subject of the invention is a lighting reflector having an optical axis passing through a radiation source with which said reflector must be associated, characterized in that it comprises, a reflecting cupola having a toroidal-ellipsoidal curvature and the meridian sections of which consist substantially of two arcs of ellipses having distinct and symmetrical centers with respect to the optical axis, and, advantageously associated with the dome, a coaxial frustoconical mirror, the most small cross section is located substantially in the same plane as that of the largest cross section of said dome.
  • FIG. 1 schematically represents in meridian section, the essential components of a lighting reflector according to the invention.
  • FIG. 2 schematically represents the particular case where the arcs of ellipses are arcs of circles.
  • Figure 3 shows schematically in perspective the case where the reflective dome has at its top an axial depression.
  • Figure 4 shows schematically the case where the arcs of ellipses are connected to the top by an arc of a circle.
  • FIG. 5 schematically represents a variant in which the reflecting couple has a recess at its top.
  • FIG. 6 schematically shows an exemplary embodiment where the centers of the arcs of ellipses are not located in the plane common to the largest section of the reflecting dome and to the smallest section of the frustoconical mirror.
  • FIG. 7 schematically shows an exemplary embodiment where the largest cross section of the reflecting dome coincides with the smallest cross section of the frustoconical mirror.
  • FIG 1 is shown schematically in meridian section the essential components of a lighting reflector according to the invention.
  • the reflector is associated with a radiation source of center 1 and has an optical axis 2 passing through the center 1 of the source.
  • the reflector comprises a reflecting dome 3 associated with a frustoconical mirror 4.
  • the surface of the reflecting dome is geometrically defined as being generated by the revolution around the axis 2 of two arcs 5-6 and 7-8, symmetrical with respect to this axis, belonging respectively to two ellipses.
  • the first has its center 9 located at a distance 9-1 from the optical axis 2, and the second has its center 10 symmetrical from the center 9 with respect to the optical axis 2.
  • the first ellipse at one of its foci located at the location of center 1 of the source and its other focus at a point 11 symmetrical with point 1 with respect to its own center 9.
  • the second ellipse also has one of its foci located at the location of center 1 of source and its other focus at a point 12 symmetrical with point 1 with respect to its own center 10.
  • the centers 9 and 10 are, in this example, located in the plane common to the largest cross section of the reflecting dome 3 and to the smallest cross section of the frustoconical mirror 4.
  • the major axes of these ellipses belong, in this example , to the same straight line passing through the center 1 of the source and perpendicular to the optical axis 2.
  • the reflecting dome 3 has a curvature which is both toric and ellipsoidal.
  • the arcs of ellipses are limited, on the side of the top of the dome 3, at points 6 and 8 which are, with this example, at a distance from axis 2 equal to that of points 9 and 10 at the same axis 2
  • the dome 3 with a toroidal-ellipsoidal curvature is therefore limited at its top by a circle of diameter 6-8. It is optically supplemented by a reflective surface 13-14 which can be flat or have any curvature that we want.
  • a coaxial frustoconical mirror 4 with a smaller straight section 15 and a larger section 16, is associated with the dome 3.
  • the surface of the mirror can also be "conoidal", the generating curve remaining parallel to a given direction.
  • frustoconical mirror taken into account in the spirit of the present invention and throughout the description, are the angle at the mean apex of a cone and the ratio of the areas between the largest cross section and the smallest cross section of the frusto-conical mirror.
  • the smallest straight section 15 is located in a plane which coincides with that of the largest flat section, 17, of the dome 3.
  • the foci 9 and 10 of the arcs of ellipses are, in this example, located inside of the frustoconical mirror 4, in the plane of the small planar section.
  • the dome 3 with toroidal-ellipsoidal curvature forms from the center of the source an infinity of images distributed over a circle of diameter 11-12. It thus provides lighting according to symmetrical layers around the optical axis 2. It is also easy, under these conditions, to set the value of the diameter 11-12 so that the reflected light rays do not reach the damaging zones of source. These results, important in themselves, take even more interest by association with the frusto-conical mirror 4. This indeed requires, in order to operate under good conditions, an emission of radiation distributed symmetrically around its axis.
  • FIG. 2 shows the particular case where the arcs of ellipses are arcs of circles (case of zero "eccenticity"). Their homes are respectively confused with their centers 18 and 19.
  • These arcs 5 a -6 a and 7 a -8 a are summarily limited to points 6 a and 8 a located respectively on the perpendiculars 18-6 a and 19-8 a to the large base of the diameter 5 a -7 has the reflecting dome 3, and therefore on the parallels to the optical axis passing through the centers 18 and 19.
  • the dome 3 has a spherical toroidal curvature. In this case, the light rays reflected by the dome 3 do not pass exactly through the points 20 and 21 symmetrical of the source with respect to the centers 18 and 19.
  • the reflected rays pass by points which are distributed between 20 and 1, and 21 and 1, respectively according to the geometrical places of concentration of the light which one calls "caustic".
  • the mirror is stigmatic and the reflected rays pass through one or the other of the focal points.
  • Figure 3 shows schematically, in perspective, a variant where the arcs of ellipses are not limited on the side of the top of the reflector, as they are in the figure 1, at points 6 and 8. These arcs extend up to the optical axis 2.
  • the reflecting dome 3 has a "Kouglof mold” shape and has a central depression 3 a at its top.
  • FIG. 4 represents the case where the connection between the ends 22 and 23 of the arcs of ellipses is ensured by an arc of a circle 24 whose center is located at the point of intersection of axis 2 and the normals which are the bisectors angles 25-22-1 and 26-23-1, 25 and 23 being the foci that the arcs of ellipses do not have in common.
  • FIG. 5 represents a variant of the invention particularly suitable for the case where the radiation source has a single base disposed along the axis 2 of the reflector on the side of its top. A circular recess of diameter 27-28 is necessary for the passage of the base (not shown).
  • the ellipse arc 27-29 has one of its foci located in 1 and the other located in point 30.
  • the ellipse arc 28-31 has one of its foci located in 1 and the another located at point 32.
  • these foci 30 and 32 are close to the edge of the smallest cross section of the frustoconical mirror 4 and inside it.
  • the top ends 27 and 28 of the arcs of ellipses are located respectively on the perpendiculars, passing through the focal points 30 and 32, in the plane common to the largest section of the reflecting dome 3 and to the smallest section of the mirror. tapered 4.
  • the elliptical arc 27-29 reflects rays towards the inside of the frusto-conical mirror 4 whose angles with the optical axis 2 vary from 0 ° to 90 °, which is advantageous for the final distribution obtained and overcomes the disadvantage of having a blind spot at the top of the reflector 27-1-28.
  • the centers 33 and 34 of the arcs of ellipses are not located in the plane common to the reflecting dome 3 and to the frustoconical mirror 4.
  • the focal points 35 and 36 of the arcs of ellipses 37-38 and 39-40 are located outside the frustoconical mirror 4. Their location is chosen so that the frustoconical mirror 4 does not intercept the reflected rays, by its non-external surface reflective.
  • the useful reflecting arc 41-42 formed by a focal ellipse arc 35, extended by a reflecting arc up to the apex 42 of the reflector
  • all the rays reflected by the arc d ellipse between points 41 and 43 remain outside the conical mirror 4, avoiding its external surface.
  • the rays are reflected towards the interior of the frustoconical mirror 4.
  • the locations of the focal points 35 and 36 are here chosen to be close to the perimeter of the large base of the frustoconical mirror 4.
  • the assembly is particularly compact and provides optimally homogeneous lighting.
  • the centers 48 and 49 of the arcs of ellipses 54-50 and 46-51 are, in the example shown, located respectively on lines 1-52 and 1-53 joining center 1 of the source to points 52 and 53 of the perimeter of the largest section of the frustoconical mirror 44.
  • the focal points 54 and 55 are located inside this mirror 44.
  • the eccentricity of the ellipses is also chosen in such a way that the rays such as 1-45 (or 1-46) in the section common to the reflecting dome 47 and to the frustoconical mirror 44, are reflected passing substantially through the center 56 of the large section of the frustoconical mirror 44.
  • a Fresnel lens (not shown in the drawing) can advantageously be associated with the reflector, in particular that which is shown in FIG. 7, preferably in the vicinity of the plane of its large section.
  • the main effect of such an association is to decrease the angle of the light beam exiting the reflector.
  • the Fresnel lens can also be placed in the vicinity of the largest section of the conical mirror 4 of the embodiments of FIGS. 1 to 6.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
EP90403309A 1989-11-27 1990-11-22 Strahlung reflektierender Spiegel, insbesondere für Beleuchtungseinheiten Withdrawn EP0430776A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8915571 1989-11-27
FR8915571 1989-11-27

Publications (1)

Publication Number Publication Date
EP0430776A1 true EP0430776A1 (de) 1991-06-05

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Family Applications (1)

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EP90403309A Withdrawn EP0430776A1 (de) 1989-11-27 1990-11-22 Strahlung reflektierender Spiegel, insbesondere für Beleuchtungseinheiten

Country Status (3)

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EP (1) EP0430776A1 (de)
JP (1) JPH03190003A (de)
CA (1) CA2030474A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5719127B2 (ja) * 2010-07-27 2015-05-13 株式会社モデュレックス Ｌｅｄ光源を有する屋内照明器具

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB268787A (en) * 1926-03-31 1928-07-02 Walter Gachet Reflector diffusing apparatus for light
GB399880A (en) * 1932-04-16 1933-10-16 Curtis Lighting Europ Sa Improvements in and connected with lamp reflectors
FR1134734A (fr) * 1955-11-09 1957-04-17 Perfectionnements apportés aux réflecteurs d'éclairage à miroir demi-sphérique utilisant une source lumineuse disposée selon l'axe du réflecteur, et notamment dans le cas de la correction spectrale de la lumière par réflextion sélective
DE3032586A1 (de) * 1979-10-11 1981-04-30 Kollmorgen Technologies Corp., Dallas, Tex. Ringfoermige beleuchtungsoptik

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB268787A (en) * 1926-03-31 1928-07-02 Walter Gachet Reflector diffusing apparatus for light
GB399880A (en) * 1932-04-16 1933-10-16 Curtis Lighting Europ Sa Improvements in and connected with lamp reflectors
FR1134734A (fr) * 1955-11-09 1957-04-17 Perfectionnements apportés aux réflecteurs d'éclairage à miroir demi-sphérique utilisant une source lumineuse disposée selon l'axe du réflecteur, et notamment dans le cas de la correction spectrale de la lumière par réflextion sélective
DE3032586A1 (de) * 1979-10-11 1981-04-30 Kollmorgen Technologies Corp., Dallas, Tex. Ringfoermige beleuchtungsoptik

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JPH03190003A (ja) 1991-08-20
CA2030474A1 (fr) 1991-05-28

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