EP1635379B1 - Reflector lamp - Google Patents

Abstract

The lamp has two curved surface areas (F1, F2), where one surface area is attached at a rear of a socket (2) and another surface area is attached at a front of a reflector opening. A light discharge center of a discharge lamp (5) is arranged on a longitudinal axis of a reflector and relative to the curved surface area (F1), such that salt passing light of the discharge lamp is distributed over an entire illuminating surface.

Description

The invention relates to a reflector lamp with a concave, a pedestal, reflector arranged on the reflector longitudinal axis discharge lamp with a filling, which has or forms salts in the burning lamp at a position deviating from a vertical position of its longitudinal axis, especially at substantially horizontal position of the same, at least partially condensate as a condensate on the colder, lower side of the discharge space of the vapor phase in the liquid state, and with a reflector surface having two different curved surface areas, wherein a rear, associated with the base, first surface area and an the same subsequent front, the reflector opening associated, second surface area are provided, which are formed by surfaces of revolution, each having a conic section line as a generator.

At one of the EP 1 076 203 A2 known reflector lamp of this type, the first surface area a paraboloid, ellipsoid or spheroid and the second surface area provided with a longitudinal rib paraboloid and together serve to minimize the hot spot in the middle of the radiation, wherein the configurations of these surface areas are made such that the of the Lamp emitted light is emitted in total in a cone of light from 0 to 5 degrees from the reflector longitudinal axis, so practically with Parallel radiation. Now, if a discharge lamp of the type mentioned is used as a lamp forming the light source, in particular in a position in which the position of the longitudinal axis of the discharge lamp between zero and 45 degrees with respect to the horizontal inclined, especially horizontally, then by said , yellow colored, blue light absorbing, condensate passing down and incident on the ellipsoidal surface area and from there substantially parallel to the lamp longitudinal axis reflected light rays form a yellow spot on the illuminated surface in the lower region due to its yellowing. However, such a separation of the colors of the projected light is undesirable, one wishes rather a uniform color distribution of the light on the illuminated surface.

The document US 5,952,768 also describes a reflector lamp of the same type.

The object underlying the invention is therefore seen to provide a reflector lamp of the type described, in which, while avoiding the described demixing of the colors for a uniform distribution of the color components in the light, or for a good color mixture, is taken care of.

This object is achieved in that the reflector has two or more selected surface areas of said rotation surfaces, and that the respective curvature or curvature or curvature or in the case of conical surfaces, the opening angle of these surface areas are formed and the light emitting center of the lamp is arranged on the reflector longitudinal axis and relative to the first surface area such that the light passing through these salts of the Discharge lamp as evenly distributed over the entire lighting surface.

Paraboloids, ellipsoids, frusto-conical surfaces and spherical surfaces can be used according to the invention as the mentioned surfaces of revolution.

In this case, the different surface areas of a reflector should each have different curvatures or curvatures or opening angles, just such that each of the areas having a certain depth captures some of the yellow light of the condensed salts of the discharge lamp and on another area of the Illuminating surface reflects as the other surface areas. In this way, the yellow light can be distributed more uniformly over the illuminated area. In this case, the arrangement is expediently made such that from the apex of the reflector in the direction of the reflector opening to each on a tangent to a point of the respective curvature precipitated perpendicular of the perpendicular comes closer than the previous Lot on the tangent of the apex closer point. As a result, the light rays emanating from the yellow salts can be progressively reflected more upward toward the center of the illuminated surface and beyond it.

In a first embodiment of the invention, two surface areas are provided, wherein the first surface area is designed as a paraboloid and the second surface area as an ellipsoid.

According to a second embodiment, three surface regions are provided, wherein the first surface region is designed as a paraboloid, the second surface region as a frustoconical surface and the third surface region is likewise designed as a frustoconical surface.

There would also be four or more surface areas possible. In principle, it can be stated that the distribution of the yellow light rays originating from the abovementioned condensed salts becomes more uniformly adjustable the more surface areas of the aforementioned type are present in a reflector according to the invention. However, the production of a reflector with more than three surface areas is particularly expensive.

In order to obtain a particularly good distribution or no demixing of the yellow light rays even with only two or three surface areas, it has proven useful to provide the first surface area with spherical facets in honeycomb structure.

In addition, it may be advantageous in the specific case to provide the second surface area with facets, in which case flat spiral or cylindrical facets have proved to be sufficient, which do not scatter as much as the spherical facets.

In a preferred embodiment of a reflector according to the invention with two area regions, the light emission center of the discharge lamp is between the focal point of the first surface area and the base of the reflector, while the focal point of the second surface area is arranged offset to the side facing away from the base of the light emission center. With such an arrangement, the beam path has proven to be particularly favorable.

In an actual example of a 50 mm diameter reflector lamp according to the invention having two surface areas, the depth of the reflector is approximately 28 mm, the depth of its first surface area approximately 8.5 mm from its apex and the depth of its adjacent second surface area approximately 19.5 mm , The light emitting center of the discharge lamp is about 4.3 mm from said apex and thus located approximately in the middle of the first area, and the focal point of the first area is about 5.8 mm from this apex.

In a further embodiment of a reflector lamp according to the invention having three surface regions, the first surface region may also be a paraboloid, the second surface region may be a truncated cone surface and the third surface region may be an ellipsoid. Also, the use of a paraboloid as a first surface area, an ellipsoid as a second area area, and a frusto-conical surface as a third area area forms a further embodiment.

In a manufactured experiment example of a reflector lamp according to the invention of 111 mm diameter with three surface areas, wherein the first surface area a paraboloid, the second surface area a frustoconical surface and the third surface area also a The depth of the reflector is about 36.2 mm, the depth of its first surface area from its apex starting about 15 mm, the depth of its adjacent second surface area between about 5 mm and about 8 mm and the depth of its adjacent to the latter third Area between about 16.2 mm and about 13.2 mm, wherein the light emitting center of the discharge lamp is located about 17 mm from said apex at the focal point of the first surface area.

In the embodiments having three areas each, the distribution of the yellow light beams can be further improved by providing the first and second honeycomb surface areas and the third area having flat spiral or cylindrical facets.

The invention and its advantageous embodiments are explained in more detail below with reference to embodiments in the accompanying drawings.

It shows:

• Fig. 1
  a first embodiment of a reflector lamp according to the invention with two surface areas and the associated beam path, wherein the first surface area is formed as a paraboloid and the second surface area as an ellipsoid, in longitudinal section;
• Fig. 2
  the reflector lamp after Fig. 1 on an enlarged scale;
• Fig. 3
  a second embodiment of a reflector lamp according to the invention with three surface areas and the associated beam path, wherein the first surface area is formed as a paraboloid, the second surface area as a frustoconical surface and the third surface area also as a frustoconical surface, in longitudinal section;
• Fig. 4
  the reflector lamp after Fig. 3 on an enlarged scale.

In the Fig. 1 and 2 a first embodiment of the reflector lamp 1 according to the invention is shown. It has in its concave, a base 2 having a reflector 3 arranged on the reflector longitudinal axis 4 discharge lamp 5 with a filling, which has salts or forms in the burning lamp 5, especially in the illustrated horizontal position of its longitudinal axis, here with the Reflector longitudinal axis 4 is congruent, at least partially sublimate as condensate 6 on the colder, lower side of the discharge space 7 from the gas phase in the solid state.

The discharge lamp 5 in the illustrated embodiment is a metal halide discharge lamp having electrical leads connected to terminals 2 'on the base 2, but corresponding problems with the condensate may also be caused by other means depending on their respective filling Discharge lamps occur, possibly even with electrodeless discharge lamps.

The reflector 3 has a concave reflector surface with two differently curved surface regions F1 and F2, wherein a rear, associated with the base 2, the first surface area F1 and a subsequent thereto, the front, of a lens 10 od. Like. Covered reflector opening 9 assigned, second Surface area F2 are provided, which are formed by surfaces of revolution, each having a conic section line as a generator.

In the embodiment shown, two surface regions are provided, wherein the first surface region F1 is formed as a paraboloid and the second surface region F2 as an ellipsoid. In this case, preferably the first surface area F1 is provided with spherical facets 11 in honeycomb structure and the second area area F2 is provided with flat spiral or cylindrical facets 12.

The light emission center 5 'of the discharge lamp 5, which is assumed to be practically in the middle of the discharge space 7, is here arranged between the not shown focal point of the first area F1 and the base 2 of the reflector 3, while the focal point, not shown, of the second area F2 to the Socket 2 opposite side of the light emitting center 5 'is arranged offset, so the lens 10 back.

In a manufactured reflector lamp 1 according to this embodiment with a diameter of 50 mm, the depth T of the reflector is about 28 mm, the depth t1 of its first surface area F1 starting from its apex 13 about 8.5 mm and the depth t2 of its adjacent second surface area F2 about 19.5 mm. The light emission center 5 ' The discharge lamp is about 4.3 mm away from said apex 13 and thus arranged approximately in the middle of the first surface area F1. The focal point of the first area is approximately 5.8 mm from this apex 13.

The apex 13 of the parabolic surface or the paraboloid of the first surface area F1 and the immediately surrounding, in the Fig. 1 and 2 Dashed part 14 of the first surface area F1 is so to speak cut off by the base 2, especially since he is largely hidden by the discharge space 7 of the discharge lamp 5 and could make any significant contribution to the light reflection anyway.

In Fig. 1 Now, the beam path of the passing through the condensate 6 and thereby discolored, and usually yellow discolored, light rays shown. In this case, the light beams reflected by the first area F1 are shown as solid lines by the reference numeral 15, the light beams 16 reflected by the second area area F2 by dashed lines.

According to the law of reflection, the angle of incidence of a light beam impinging on the reflector surface is equal to the angle of reflection thereof, regardless of whether these angles are measured with respect to a tangent applied to the impact surface on the reflector surface or to the solder deposited on this tangent at the point of impact. This applies in general and of course for all embodiments of the invention.

Three such solders 17, 17 'and 17 "on impact points 18, 18' and 18" on the elliptical second surface area F2 are shown in FIG Fig. 2 shown. From these points of incidence 18, 18 ", 18", the three light beams 16 shown go off. Of course, the same applies to the outgoing light rays 15 from the parabolic first area F1.

In Fig. 1 is the surface illuminated by the light beams 15 and 16, the illumination surface 19. The reflector longitudinal axis 4 is incident on the illumination surface 19 at 4 'as the illumination center.

The yellow light beams 15 emanating from the first surface area F1 illuminate a surface which, in the side view shown, is indicated by the end points i1, i1 and a center m1. This surface covers the lower region of the illumination surface 19 and goes up beyond the center 4 'of the illumination surface 19. Its center m1 is offset by the distance e1 from the center 4 'of the illumination surface 19 down.

The light beams 16 emanating from the second surface area F2 illuminate a surface which, in the side view shown, is indicated with the end points i2, i2 and a center m2. This surface covers the upper region of the illumination surface and does not reach all the way to the center 4 'of the illumination surface 19. Its center m2 is offset by the distance e2 from the center 4 'of the illumination surface 19 upwards.

As can be seen, there is a slight overlap of the light beams 15 and 16 in the area between i1 and i2. Overall, a scattering of the yellow light beams 15 and 16 over the entire illumination area 19 results and thus a good distribution thereof and mixing with the rest of the light Discharge lamp 5. A segregation and thus a yellow spot especially in the lower region of the illumination surface 19 are thereby avoided.

The depth t1 of the first surface area F1 in this 50 mm reflector lamp 1 is essentially dependent on the length of the discharge chamber of the discharge lamp 5 and the position of the discharge lamp 5 or its light emission center 5 '. If the depth t1 and therefore the length of F1 became longer and longer, then the proportion of yellow light of the condensate reflected by F1 would become larger and larger and would be reflected downwards. Only a small proportion of the yellow light, only a fraction of it, would fall on the second surface area F2 and be reflected upwards. The result would be a more concentrated yellow light in the lower area of the illumination area 19 in the combination, which should be avoided.

In the Fig. 3 and 4 a second embodiment of the reflector lamp 100 according to the invention is shown. It has in the same way as the first embodiment in its concave, a base 20 having reflector 30 has a arranged on the reflector longitudinal axis 40 discharge lamp 50 with a filling, which has salts or forms in the burning lamp 50, especially in the illustrated horizontal position its longitudinal axis, which is also congruent here with the reflector longitudinal axis 40, at least partially as Condensate 60 on the colder, lower side of the discharge space 70 from the gas phase in the solid state sublimate.

In this second embodiment, the reflector 30 has a concave reflector surface 80 with three different curved surface areas F10, F20 and F30, wherein a rear, the base 20 associated, first surface area F10 and a subsequent thereto the central area F20 and a third surface area F30 are provided , The third surface area F30 adjoins the reflector opening 90 and is covered by a lens 200 or the like. All areas F10, F20 and F30 are formed by surfaces of revolution, each having a conic section as a generatrix.

In the illustrated preferred embodiment, the first area F10 is formed as a paraboloid, the second area F20 as a frustoconical surface and the third area F30 also as a frustoconical surface.

Further, the light emitting center 50 'of the discharge lamp 50 is disposed at the focal point of the first area F10. The frustoconical second and third surface areas F20 and F30 naturally have no foci.

In a manufactured reflector lamp 20 according to this embodiment with a diameter of 111 mm, the depth T of the reflector is about 36.2 mm, the depth t10 of its first surface area F10 starting from its apex 130 about 15 mm, the depth t20 of its adjacent second surface area F20 between about 5 mm and about 8 mm and the depth t30 of its third surface area F30 adjacent to the latter is between about 16.2 mm and about 13.2 mm. The light emitting center 50 'of the discharge lamp 50 is located at about 17 mm from said apex 130 at the focal point of the first area F10.

In this case, the focal point of the first area F10 is located very close to the lens 200, i. H. at a greater distance from the apex 130. The length or depth t10 and thus the first surface area F10 ends at the beginning of the discharge space of the discharge lamp 50 and the length or depth t20 and thus the second area F20 begins there and extends slightly beyond the end the discharge space of the discharge lamp 50, which is at most 8 mm long. In this way, the wide area F20 has approximately the same function as the first area F1 in the 50 mm reflector lamp according to the first embodiment.

Preferably, the first and second surface regions F10 and F20 are provided with spherical facets 110 in honeycomb structure and the third surface region F30 is provided with flat spiral or cylindrical facets 120.

In Fig. 3 For example, the area illuminated by the light beams 150, 160 and 170 is the illumination area 190. The reflector longitudinal axis 40 is incident on the illumination area 190 at 40 'as the illumination center.

The yellow light beams 150 emanating from the first area F10 are shown interrupted and illuminate a surface that in the side view shown in FIG Fig. 3 , as already indicated in the first embodiment, with the end points i1, i1 and a center ml, which lies around the distance e1 and thus only slightly below the center 40 of the illumination surface 190. This area covers almost the entire area of the illumination area 190.

The yellow light beams 160 emanating from the second surface area F20 illuminate a surface which, in the side view shown, is again indicated by the end points i2, i2 and a center m2. This surface covers only the lower area of the illumination surface 190, its center m2 lies around the distance e2 below the center 40 '.

The yellow light beams 170 emanating from the third surface area F30 illuminate an area which, in the side view shown, is indicated by the end points e3, e3 and a center point m3. This area is above the center point 40, namely by the distance e3.

As can be seen, the surface i1, i1 covers most of the two surfaces i2, i2 and i3, i3. Overall, a scattering of the yellow light beams 150, 160 and 170 over the entire illumination surface 190 results and thus a very good distribution of the same and mixing with the remaining light of the discharge lamp 50. Demixing and thus a yellow spot especially in the lower region of the illumination surface 190 are avoided.

It should be emphasized that in the context of the invention, other arrangements of the surface areas formed by surfaces of revolution of conical cutting lines are possible. For example, in the second embodiment described, the first area may be a paraboloid, the second area may be a frusto-conical surface, and the third area may be an ellipsoid, not shown. The possibility of forming the first surface area in a manner not shown as a paraboloid, the second surface area as an ellipsoid, and the third surface area as a frustoconical surface should also be expressly pointed out here.

Claims (15)

1. Reflector lamp (1, 100) having a discharge lamp (5, 50) arranged on the reflector longitudinal axis (4, 40) in the concave reflector (3, 30) having a base (2, 20), the discharge lamp (5, 50) having a filling which has or forms salts which condense in the burning discharge lamp (5, 50) in a position of its longitudinal axis deviating from a vertical position, particularly in essentially horizontal position of the same, at least partly as condensate on the colder, lower side of the discharge chamber (7, 70) from the vapour phase into the liquid physical state, and having a reflector surface (8, 80), which has two differently curved surface areas (F l, F2), wherein a rear, first surface area (F1) assigned to the base (2) and a front adjoining the same, second surface area (F2) assigned to the reflector opening (9) are provided, which are formed by surfaces of revolution which have in each case a conical intersection line as generatrix,
   characterised in that
   the reflector (3, 30) has two or more surface areas (F1, F2; F10, F20, F30) selected from the said surfaces of revolution, and in that the particular curvatures or arches or in the case of conical surfaces, the aperture angle of these surface areas (F1, F2; F10, F20, F30), are designed and the light-release centre (5', 50') of the discharge lamp (5, 50) is arranged on the reflector longitudinal axis (4, 40) and relative to the first surface area (F1; F10) such that the light of the discharge lamp (5, 50) passing through these salts can be distributed as uniformly as possible over the entire illumination surface (19; 190).
2. Reflector lamp (1) according to claim 1,
   characterised in that
   two surface areas (F1, F2) are provided and the first surface area (F1) is designed as a paraboloid and the second surface area (F2) as an ellipsoid.
3. Reflector lamp (1) according to claim 1,
   characterised in that
   three surface areas (F10, F20, F30) are provided and the first surface area (F10) is designed as a paraboloid, the second surface area (F20) as a frustum surface and the third surface area (30) likewise as a frustum surface.
4. Reflector lamp (1) according to claim 1, 2 or 3,
   characterised in that
   the first surface area (F1) is provided with spherical facets (11) in honeycomb structure.
5. Reflector lamp according to claim 1, 2, 3 or 4,
   characterised in that
   the second surface area (F2) is provided with flat-spiral or cylindrical facets (12).
6. Reflector lamp (1) according to claim 1, 2, 4 or 5,
   characterised in that
   the light-release centre (5') of the discharge lamp (5) is arranged between the focal point of the first surface area (F1) and the base (2) of the reflector (3), whereas the focal point of the second surface area (F2), not shown, is arranged to be offset to the side of the light-release centre (5') facing away from the base (2).
7. Reflector lamp (100) according to one of claims 1, 3, 4 or 5,
   characterised in that
   the light-release centre (50') of the discharge lamp (50) is arranged in the focal point of the first surface area (F10), whereas the focal points, if present, of the one or the further surface area or surface areas (F20, F30) is or are arranged to be offset to the side of the light-release centre (50') facing away from the base (20).
8. Reflector lamp (1) according to claim 1, 2, 4, 5 or 6,
   characterised in that
   the depth (T) of the 50 mm reflector (3) is about 28 mm, the depth (t1) of its first surface area (F1) starting from its apex (13) about 8.5 mm and the depth (t2) of its adjoining second surface area (F2) about 19.5 mm, in that the light-release centre of the discharge lamp (5) is arranged about 4.3 mm away from the said apex (13) and hence approximately in the centre of the first surface area (F1), and in that the focal point of the first surface area (F1) lies about 5.8 mm away from this apex (13).
9. Reflector lamp according to claim 1, 3, 4, 5 or 7,
   characterised in that
   the first surface area is a paraboloid, the second surface area is a frustum surface and the third surface area is an ellipsoid.
10. Reflector lamp according to claim 1, 3, 4, 5 or 8,
    characterised in that
    the first surface area is a paraboloid, the second surface area is an ellipsoid and the third surface area is a frustum surface.
11. Reflector lamp (100) according to claim 1, 3, 6, 7, 9 or 10,
    characterised in that
    the depth (T) of the 111 mm reflector (30) is about 36.2 mm, the depth (t10) of its first surface area (F10) starting from its apex (130) about 15 mm, the depth (t20) of its adjoining second surface area (F20) between about 5 mm and about 8 mm and the depth (t30) of its third surface area (F30) adjoining the latter between about 16.2 mm and about 13.2 mm, and in that the light-release centre of the discharge lamp (50) is arranged about 17 mm away from the said apex (130) in the focal point of the first surface area (F10).
12. Reflector lamp (100) according to claim 3, 4, 5, 9, 10 or 11,
    characterised in that
    the first and the second surface area (F 10, F20) are provided with spherical facets (110) in honeycomb structure and the third surface area (F30) with flat-spiral or cylindrical facets (120).
13. Reflector lamp according to claim 1, 2, 4, 5, 6 or 8,
    characterised in that
    the depth (t1) of the first surface area (F1) corresponds to the maximum length of the discharge chamber plus 25% of the same.
14. Reflector lamp according to claim 8,
    characterised in that
    the light-release centre of the discharge lamp (5) is arranged at a distance of about 4.3 mm from the apex (13) of the first surface area (F1), in that the length of the discharge chamber of the discharge lamp (5) is about 8 mm, and in that the maximum depth (t1) of the first surface area (F1) is about 8.3 mm.
15. Reflector lamp according to claim 1, 3, 4, 5, 7, 9, 10, 11 or 12,
    characterised in that
    the focal point of the first surface area (F10) is arranged very close to the lens (200), the depth (t10) of the first surface area (F10) terminates at the start of the discharge chamber of the discharge lamp 50 and the depth (t20) of the second surface area (F20) begins at this start and extends at the most as far as the end of the discharge chamber of the discharge lamp 50 plus 25% of the same, wherein the discharge chamber is a maximum 8 mm long.

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