Actuating device for operating lamps

• US 8,408,735 B2
• Filed: 11/16/2010
• Issued: 04/02/2013
• Est. Priority Date: 11/18/2009
• Status: Active Grant

• Current Assignee: Dragerwerk AG & Company KGaA (FPS Vermögensverwaltung GmbH)
• Original Assignee: Drager Medical GmbH (FPS Vermögensverwaltung GmbH)
• Inventors: Kretschmann, Hanno
• Primary Examiner(s): CARIASO, ALAN B
• Application Number:
  US12/947,479
• Publication Number:
  US 20110116260A1
• Time in Patent Office: 868 Days
• Field of Search: 362/804, 362/184, 362/230, 362/231, 362/249.05, 362/800
• US Class Current: 362/231
• CPC Class Codes: F21W 2131/205 for operating theatres
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2105/12 characterised by the geometrical disposition of the light-generating elements, e.g. arranging light-generating elements in differing patterns or densities
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light

Abstract

An actuating device for operating lamps (1) includes an actuator provided for actuating a number of first light-emitting diodes (6) for generating white light, on the one hand, and a number of second light-emitting diodes (7) for generating single-color light, on the other hand. A control is provided such that only the first light-emitting diodes (6) are switched on in a first operating state of the operating lamp (1) and such that the first light-emitting diodes (6) and the second light-emitting diodes (7) are switched on in a second operating state. The second light-emitting diodes (7) are designed such that a preset color rendering index is greater in the second operating state than in the first operating state of the operating lamp (1).

Claims

1. An actuating device for operating lamps, the device comprising:

light emitting diodes including actuatable first light-emitting diodes for generating a first white light and actuatable second light-emitting diodes for generating a blue light;

an actuator for actuating the first light-emitting diodes to generate said first white light, and also for actuating the second light-emitting diodes to generate said blue light such that only the first light-emitting diodes are switched on in a first operating state of the operating lamp and that the first light-emitting diodes and the second light-emitting diodes are switched on in a second operating state to generate a second white light, wherein the second light-emitting diodes are designed such that a general color rendering index R_a and a color rendering index R₉ is greater than 70, and a color temperature in the second operating state is greater than a color temperature in the first operating state of the operating lamp.

2. An actuating device in accordance with claim 1, wherein the first light-emitting diodes and the second light-emitting diodes are chosen to have said general color rendering index Ra greater than 90.

3. An actuating device in accordance with claim 1, wherein:

said second light-emitting diodes radiate light in a spectral range with a maximum at 450 nm.

4. An operating lamp comprising:

light emitting diodes comprising an actuatable first set of light-emitting diodes for generating a first white light and an actuatable second set of light-emitting diodes for generating a blue light;

a light module accommodating the first set of light-emitting diodes and the second set of light-emitting diodes, and having a light exit area, said second light-emitting diodes being arranged distributed in an area of a circumferential edge of said light exit area;

an actuator means for actuating the first set of light-emitting diodes, and also for actuating the second set of light-emitting diodes such that only the first light-emitting diodes are switched on in a first operating state of the operating lamp and that the first light-emitting diodes and the second light-emitting diodes are switched on in a second operating state to generate a second white light, wherein the second light-emitting diodes are such that a general color rendering index R_a and a color rendering index R₉ is greater than 70, and a color temperature in the second operating state is greater than a color temperature in the first operating state of the operating lamp.

5. An operating lamp in accordance with claim 4, wherein the second light-emitting diodes are arranged uniformly distributed in the area of the circumferential edge of the light exit area.

6. An operating lamp in accordance with claim 4, wherein the second light-emitting diodes are arranged adjacent to the outer, first light-emitting diodes in the circumferential direction of the light exit area, wherein two of the second light-emitting diodes are combined as twin light-emitting diodes in a common housing.

7. An operating lamp in accordance with claim 4, wherein the first and second light-emitting diodes are commonly combined on one or more LED chips.

8. An operating lamp in accordance with claim 4, wherein the actuator means comprises a control unit with a control selector element to set the first operating state and a control selector element to set the second operating state.

9. An operating lamp in accordance with claim 4, wherein the first light-emitting diodes and the second light-emitting diodes are chosen for the lamp to provide said general color rendering index R_a in the second operating state greater than 90.

10. An operating lamp in accordance with claim 4, wherein:

said second light-emitting diodes radiate light in a spectral range with a maximum at 450 nm.

11. An operating lamp comprising:

a plurality of first light-emitting diodes for generating a first white light with a first general color rendering index;

a plurality of second light-emitting diodes generating a blue light, a combination of said first white light and said blue light creating a second white light, said first and second light emitting diodes being arranged to have said second white light have a second general color rendering index R_a and a color rendering index R₉ that is greater than 70, said second white light having a color temperature greater than a color temperature of said first white light;

a light module accommodating said first light-emitting diodes and said second light-emitting diodes to emit the respective light in a similar direction;

an actuator for actuating said first light-emitting diodes, and also for actuating said second light-emitting diodes, said actuator selectively switching between a first operating state of the operating lamp with said first light-emitting diodes on and said second light-emitting diodes off, and a second operating state with said first light-emitting diodes and said second light-emitting diodes on.

12. An operating lamp in accordance with claim 11, wherein:

said first and second white lights have a color temperature between 3739 and 5685.

13. An operating lamp in accordance with claim 11, wherein:

said second light-emitting diodes radiate light in a spectral range with a maximum at 450 nm.

14. An operating lamp in accordance with claim 11, wherein:

said second general color rendering index R_a is greater than 90.