Focusable spotlight with a negative lens

• US 6,575,598 B2
• Filed: 12/18/2001
• Issued: 06/10/2003
• Est. Priority Date: 12/18/2000
• Status: Expired due to Fees

• Current Assignee: Dedo Weigert Film GmbH
• Original Assignee: Dedo Weigert Film GmbH
• Inventors: Weigert, Dedo, Chin, Depu
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Negron, Ismael
• Application Number:
  US10/020,243
• Publication Number:
  US 20020114160A1
• Time in Patent Office: 539 Days
• Field of Search: 362/268, 362/308, 359/366, 359/728
• US Class Current: 362/268
• CPC Class Codes: F21S 8/003 Searchlights, i.e. outdoor lighting device producing powerful beam of parallel rays, e.g. for military or attraction purposes searchlights mounted on a vehicle B60Q1/245
• CPC Class Codes: F21V 14/02 by movement of light sources in vehicle head lamps F21S41/657
• CPC Class Codes: F21V 14/04 by movement of reflectors in vehicle head lamps F21S41/675
• CPC Class Codes: F21V 14/06 by movement of refractors in vehicle head lamps F21S41/635
• CPC Class Codes: F21V 5/045 the lens having discontinuous faces, e.g. Fresnel lenses
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21W 2131/406 for theatres, stages or film studios

Abstract

A spotlight has a curved reflector (1, 1′) and a lamp (2, 2′) arranged inside a cavity formed by the reflector (1, 1′). The lamp (2, 2′) and the reflector (1, 1′) are movable relative to one another in a direction of a main optical axis of the spotlight. A converging lens (5) is arranged in front of the reflector (1, 1′) in a direction of light emission. A dispersive lens (6) is arranged between the reflector (1, 1′) and the converging lens (5).

Claims

1. A spotlight having a curved reflector (1, 1′

) and a lamp (2, 2′

) arranged inside a cavity formed by the reflector (1, 1′

), with the lamp (2, 2′

) and the reflector (1, 1′

) being movable relative to one another in a direction of a main optical axis of the spotlight, and a converging lens (5) arranged in front of the reflector (1, 1′

) in a direction of light emission, wherein a dispersive lens (6) is arranged between the reflector (1, 1′

) and the converging lens (5).

2. The spotlight of claim 1, wherein the reflector (1, 1′

) is movable with the lamp (2, 2′

) in the direction of the main optical axis of the spotlight.

3. The spotlight of claim 1, wherein the dispersive lens (6) is movable in the direction of the main optical axis of the spotlight.

4. The spotlight of claim 1, wherein the reflector (1, 1′

) and the dispersive lens (6) are movable together in the direction of the main optical axis of the spotlight.

5. The spotlight of claim 1, wherein a rear central area of a reflector wall is closed, the lamp (2′

) has a two-side socket mount, and the reflector wall has two guide slots to receive and guide movement of the two-side socket mount.

6. The spotlight of claim 1, wherein at least one of the converging lens (5) and the dispersive lens (6) is a Fresnel lens.

7. The spotlight of claim 1, wherein at least one of the converging lens (5) and the dispersive lens (6) is a resinous plastic lens.

8. The spotlight of claim 1, wherein at least one of the surfaces of the dispersive lens (6) in the path of the beam has a micro-lens structure.

9. The spotlight of claim 1, wherein the dispersive lens (6) is an aspherical lens.

10. The spotlight of claim 1, wherein at least a portion of the surface of the converging lens (5) has a micro-lens structure.

11. The spotlight of claim 1, wherein each of the converging lens (5) and the dispersive lens (6) is a Fresnel lens.

12. The spotlight of claim 1, wherein each of the converging lens (5) and the dispersive lens (6) is a resinous plastic lens.

13. The spotlight of claim 1, wherein a reflector wall of the reflector has an opening (4) in its rear central area.

14. The spotlight of claim 13, wherein the lamp is movable through the opening (4).

15. The spotlight of claim 13, wherein a socket-and-movement device (3) for the lamp (2) extends through the opening (4).

16. The spotlight of claim 1, wherein

the reflector (1) is displaceable in the direction of the main optical axis of the spotlight;

the lamp (2) is displaceable in the direction of the main optical axis of the spotlight;

the dispersive lens (6) is displaceable in the direction of the main optical axis of the spotlight, and

during adjustment from a flood setting toward a spot setting of the spotlight, the dispersive lens (6) is displaced away from the converging lens (5), the reflector (1) is displaced away from the dispersive lens (6), and the lamp (2) is displaced into the reflector (1), with the spotlight being structured so that said displacements of the reflector (1), the lamp (2) and the dispersive lens (6) are carried out by a unitary movement mechanism in a predetermined and coordinated manner such that, when seen over a complete displacement between the flood setting and the spot setting of the spotlight, with a subdivision of this complete displacement into multiple displacement sections, there is no linear relationship between the respective displacement lengths of the reflector (1), the lamp (2) and the dispersive lens (6).

17. The spotlight of claim 16, wherein the spotlight is structured so that during an adjustment from the flood setting to the spot setting, at least during a portion of the adjustment, spacing between the dispersive lens (6) and the converging lens (5) increases to a greater extent than does a spacing between the reflector (1) and the dispersive lens (6).

18. The spotlight of claim 16, wherein the spotlight is structured so that during an adjustment from the flood setting to the spot setting, a spacing between the reflector (1) and the dispersive lens (6) increases to a greater extent, at least during a portion of the adjustment, than does a displacement of the lamp (2) into the reflector (1).

19. The spotlight of claim 1, wherein a shape of the reflector (1, 1′

), except for a central rear area thereof, is generated by rotation of a curved section (P) about the main optical axis of the spotlight, said curved section P being a curved section of a smooth curve (C), which can be described by a polynomial function, and if the curve (C) has only a single apsis, said apsis being away from the main optical axis of the spotlight.

20. The spotlight of claim 19, wherein the smooth curve (C) conforms to the following functional relationship:

21. The spotlight of claim 20, wherein the a has a value of 0.046.

22. The spotlight of claim 19, wherein a shape of the reflector (1, 1′

) is generated by rotation of a curved section (P) about the main optical axis of the spotlight, said curved section P being a curved section of a smooth curve (C), which can be described by a polynomial function, and if the curve (C) has only a single apsis, said apsis being away from the main optical axis of the spotlight.

23. The spotlight of claim 20, wherein the smooth curve (C) conforms to the following functional relationship:

24. The spotlight of claim 23, wherein the a has a value of 0.046.