Light reflector with a defined contour sharpness of the light distribution produced thereby

• US 20070268706A1
• Filed: 05/15/2007
• Published: 11/22/2007
• Est. Priority Date: 05/16/2006
• Status: Active Grant

• Current Assignee: Auer Lighting GmbH (Saratoga Lighting Holdings LLC)
• Original Assignee: Schott AG (Carl-Zeiss-Stiftung)
• Inventors: Wagener, Harry, Kittelmann, Rudiger
• Granted Patent: US 7,547,120 B2
• Time in Patent Office: Days
• US Class Current: 362/348
• CPC Class Codes: F21V 19/0005 of sources having contact pins, wires or blades, e.g. pinch sealed lamp F21V19/001 takes precedence
• CPC Class Codes: F21V 7/09 with a combination of different curvatures

Abstract

The invention relates to a light reflector comprising a reflective surface having facets at least in sections, and a region for arranging at least one luminous means, wherein facets in a first region, closer to the region for arranging at least one luminous means, the region close to the luminous means, have a cylindrical shape, and facets in a second region, more remote from the region for arranging at least one luminous means, the region remote from the luminous means, have a spherical shape.

Claims

1. A light reflector comprising:

a reflective surface having facets at least in sections; and

a region for arranging at least one luminous means;

wherein said light reflector is defined by the fact that facets in a first region, closer to the region for arranging at least one luminous means, the first region being the region close to the luminous means, have a cylindrical shape, and

wherein facets in a second region, more remote from the region for arranging at least one luminous means, the second region being the region remote from the luminous means, have a spherical shape.

2. The light reflector as claimed in claim 1, wherein the boundary between the first region, close to the luminous means, and the second region, remote from the luminous means, runs approximately along the line of intersection of a plane running perpendicular to the axis of symmetry.

3. The light reflector as claimed in claim 1, wherein the first region, close to the luminous means, occupies between 5 and 70%, of the reflective surface.

4. The light reflector as claimed in claim 2, wherein the boundary between the first region, close to the luminous means, and the second region, remote from the luminous means,

i) subdivides the surface of the reflector for a contour sharpness value according to DIN 5040-4, April 1999, at an area ratio of approximately 1 to 4 for a value of K3, the factor 1 defining the area of the spherical facets and the factor 4 defining the area of the cylindrical facets, and

ii) subdivides it at an area ratio of approximately 1 to 1 for a value of K4.

5. The light reflector as claimed in claim 1, wherein, in the case of a contour sharpness according to DIN 5040-4, April 1999,

i) for a value of K3 the radii of the spherical facets are approximately 0.67 to 1.0 times the focal length of the reflector, and the cylindrical facets define at least 48 subdivisions over the circular circumference, and

ii) for a value of K4 given a reflector with a focal length of 5.2 mm and a basic contour scattering of the reflector of approximately 15°

, the scattering behavior thereof by cylinders and spheres is widened to 36 to 38°

, the radii of the spherical facets being approximately 3.5 to 5 mm, and the cylindrical facets defining at least 48 subdivisions over the circular circumference.

6. The light reflector as claimed in claim 5, wherein, in the case of a contour sharpness according to DIN 5040-4, April 1999,

i) for a value of K3 given a reflector with a focal length of 5.2 mm and a basic contour scattering of the reflector of approximately 15°

, the scattering behavior thereof by cylinders and spheres is widened to 36 to 38°

, the radii of the spherical facets being approximately 3.5 to 5 mm, and the cylindrical facets defining at least 48 subdivisions over the circular circumference, and

ii) for a value of K4 given a reflector with a focal length of 5.2 mm and a basic contour scattering of the reflector of approximately 15°

, the scattering behavior thereof by cylinders and spheres is widened to 36 to 38°

, the radii of the spherical facets being approximately 3.5 to 5 mm, and the cylindrical facets defining at least 48 subdivisions over the circular circumference.

7. The light reflector as claimed in claim 3, wherein the reflector has a maximum inside diameter of approximately 42 mm and a focal length that is greater than 5.0 mm.

8. The light reflector as claimed in claim 1, wherein in the case of the facets the ratio of length to width in the first region, close to the luminous means, is more than 2, times as large as in the second region, remote from the luminous means.

9. The light reflector as claimed in claim 1, wherein at least a portion of the facets define polyhedral sections.

10. The light reflector as claimed in claim 9, wherein at least a portion of the facets in the second region, remote from the luminous means, define regular or semiregular polyhedral sections.

11. The light reflector as claimed in claim 1, wherein the facets are at least partially constructed in at least one of a convex and concave fashion.

12. The light reflector as claimed in claim 1, wherein the light reflector is constructed in a spherical, parabola-shaped or ellipsoidal fashion.

13. The light reflector as claimed in claim 1, wherein the circumferential shape of the facets in the second region, remote from the luminous means, is substantially constructed in a polygonal fashion.

14. The light reflector as claimed in claim 1, wherein the circumferential shape of the facets in the first region, close to the luminous means, is substantially constructed in an elongated fashion.

15. The light reflector as claimed in claim 1, wherein facets in the second region, remote from the luminous means, are substantially arranged in honeycomb fashion relative to one another.

16. The light reflector as claimed in claim 1, wherein the light reflector has at least one second opening, substantially arranged in the midpoint area, for introducing a luminous means.

17. The light reflector as claimed in claim 2, wherein the facets are grouped around the axis of symmetry of the reflector and run radially, at least in the first region, close to the luminous means.

18. A luminaire comprising:

at least one luminous means;

and at least one light reflector that comprises;

a reflective surface having facets at least in sections, and

a region for arranging at least one luminous means,

wherein said light reflector is defined by the fact that facets in a first region, closer to the region for arranging at least one luminous means, the first region being the region close to the luminous means, have a cylindrical shape, and

wherein facets in a second region, more remote from the region for arranging at least one luminous means, the second region being the region remote from the luminous means, have a spherical shape.

19. The luminaire as claimed in claim 18, wherein the luminous means has a length of 2.5 to 3.5 mm and has a diameter that is less than or equal to 1.5 mm.

20. The luminaire as claimed in claim 18, wherein the luminous means has a length of approximately 2.5 mm and a diameter of approximately 1 mm.

21. The luminaire as claimed in claim 18, wherein the luminous means has a length of approximately 3.5 mm and a diameter of approximately 1.5 mm.

22. The luminaire as claimed in claim 18, wherein the position of the luminous means is axially adjustable along the optical axis of the reflector.

23. The luminaire as claimed in claim 18, wherein the reflector is configured as a substantially concave, cylindrically or rotationally symmetrical body, and the luminous means is arranged adjustably in the direction of the axis of cylindrical or rotational symmetry of the reflector.

24. A method for providing illumination for at least one of film production, on stage, and a photographic studio, the method comprising utilizing the luminaire as claimed in claim 18.