Fresnel lens spotlight with coupled variation of the spacing of lighting elements

• US 20050168995A1
• Filed: 12/22/2004
• Published: 08/04/2005
• Est. Priority Date: 12/22/2003
• Status: Abandoned Application

• Current Assignee: Auer Lighting GmbH (Saratoga Lighting Holdings LLC)
• Original Assignee: Schott AG (Carl-Zeiss-Stiftung)
• Inventors: Wagener, Harry, Kittelmann, Rudiger
• Application Number:
  US11/019,409
• Publication Number:
  US 20050168995A1
• Time in Patent Office: Days
• US Class Current: 362/328
• CPC Class Codes: F21L 4/005 the device being a pocket lamp F21L4/022, F21L4/045, F21L4/085 take precedence
• CPC Class Codes: F21V 14/02 by movement of light sources in vehicle head lamps F21S41/657
• CPC Class Codes: F21V 14/06 by movement of refractors in vehicle head lamps F21S41/635
• CPC Class Codes: F21V 3/04 characterised by materials, surface treatments or coatings
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 9/08 for producing coloured light, e.g. monochromatic; for reducing intensity of light with provision for controlling the colour F21V9/40
• CPC Class Codes: F21W 2131/20 Lighting for medical use
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 3/08 with discontinuous faces, e.g. Fresnel lens diffractive Fresnel lenses G02B5/1876

Abstract

A Fresnel lens spotlight whose emitted light beam has a variable aperture angle, having a reflector, a lamp and at least one Fresnel lens is provided. The at least one Fresnel lens has a negative focal length and a virtual focal point.

Claims

1. A Fresnel lens spotlight having an emitted light beam with an adjustable aperture angle, comprising:

a reflector,

a lamp; and

at least one Fresnel lens having a negative focal length that defines a virtual focal point.

2. The Fresnel lens spotlight as claimed in claim 1, wherein the reflector has a reflector focal point that is remote from the reflector so that the reflector focal point can be superimposed on the virtual focal point in the spot position of the Fresnel lens spotlight.

3. The Fresnel lens spotlight as claimed in claim 1, wherein the at least one Fresnel lens is a biconcave negative lens.

4. The Fresnel lens spotlight as claimed in claim 1, wherein the at least one Fresnel lens comprises a double lens with chromatically corrected imaging characteristics.

5. The Fresnel lens spotlight as claimed in claim 1, wherein the at least one Fresnel lens comprises an integrated diffusing glass.

6. The Fresnel lens spotlight as claimed in claim 5, wherein the integrated diffusing glass is circular and is arranged at the center of the at least one Fresnel lens.

7. A Fresnel lens spotlight having an emitted light beam with an adjustable aperture angle, comprising:

a reflector;

a lamp;

a Fresnel lens having a negative focal length that defines a virtual focal point; and

a first distance being defined between the Fresnel lens and the reflector, said first distance being variable in a defined geometric relationship with respect to a second distance defined between the lamp and the reflector on the basis of the adjustable aperture angle to be for the emitted light beam.

8. The Fresnel lens spotlight as claimed in claim 7, wherein the second distance can be adjusted by arranging the lamp so that it can be moved with respect to an apex of the reflector.

9. The Fresnel lens spotlight as claimed in claim 7, wherein the reflector comprises a metallic or transparent dielectric glass and/or plastic.

10. The Fresnel lens spotlight as claimed in claim 7, wherein the reflector comprises at least one surface having a system of optically thin layers.

11. The Fresnel lens spotlight as claimed claim 7, wherein the reflector comprises a surface coated with aluminum.

12. The Fresnel lens spotlight as claimed in claim 7, wherein the reflector is structured to scatter light and/or the at least one Fresnel lens is structured to scatter light.

14. The Fresnel lens spotlight as claimed in claim 7, wherein the reflector and/or the at least one Fresnel lens are/is coated on at least one side.

15. The Fresnel lens spotlight as claimed in claim 14, wherein the coating on the at least one Fresnel lens is a dielectric interference layer system that changes the spectrum of the light passing through it.

16. The Fresnel lens spotlight as claimed in claim 7, wherein the lamp is selected from the group consisting of a halogen lamp, a light-emitting diode, a light-emitting diode array, and a gas discharge lamp.

17. The Fresnel lens spotlight as claimed in claim 7, further comprising an auxiliary reflector arranged between the at least one Fresnel lens and the reflector.

18. The Fresnel lens spotlight as claimed in claim 7, wherein the at least one Fresnel lens is thermally prestressed, on its surface.

22. The Fresnel lens spotlight as claimed in claim 7, wherein the reflector has a reflector focal point that is remote from the reflector so that the reflector focal point can be superimposed on the virtual focal point in the spot position of the Fresnel lens spotlight.

23. The Fresnel lens spotlight as claimed in claim 7, wherein the Fresnel lens is a biconcave negative lens.

24. The Fresnel lens spotlight as claimed in claim 7, wherein the Fresnel lens comprises a double lens with chromatically corrected imaging characteristics.

25. The Fresnel lens spotlight as claimed in claim 7, wherein the Fresnel lens comprises an integrated diffusing glass.

26. The Fresnel lens spotlight as claimed in claim 25, wherein the integrated diffusing glass is circular and is arranged at the center of the Fresnel lens.

27. The Fresnel lens spotlight as claimed in claim 26, wherein the integrated diffusing glass defines a light mixing system that changes a proportion of scattered light relative to a proportion of optically imaged light as a function of the position of the Fresnel lens spotlight.

13. (canceled)

19. A lighting set having an emitted light beam with an adjustable aperture angle, comprising:

a reflector;

a lamp;

a Fresnel lens having a negative focal length that defines a virtual focal point;

a first distance being defined between the Fresnel lens and the reflector, said first distance being variable in a defined geometric relationship with respect to a second distance defined between the lamp and the reflector on the basis of the adjustable aperture angle for the emitted light beam; and

an associated electrical power supply unit or ballast.

28. The lighting set as claimed in claim 19, wherein the reflector has a reflector focal point that is remote from the reflector so that the reflector focal point can be superimposed on the virtual focal point in the spot position of the lighting set.

20. (canceled)

21. A flashlight having an emitted light beam with an adjustable aperture angle, comprising:

a reflector;

a lamp;

a Fresnel lens having a negative focal length that defines a virtual focal point;

a first distance being defined between the Fresnel lens and the reflector, said first distance being variable in a defined geometric relationship with respect to a second distance defined between the lamp and the reflector on the basis of the adjustable aperture angle for the emitted light beam; and

an electrical energy source.

29. The flashlight as claimed in claim 21, wherein the ellipsoid reflector has a reflector focal point that is remote from the ellipsoid reflector so that the reflector focal point can be superimposed on the virtual focal point in the spot position of the flashlight.