WHITE LED LIGHTING DEVICE AND A LIGHTING APPLIANCE

• US 20130258661A1
• Filed: 03/11/2013
• Published: 10/03/2013
• Est. Priority Date: 03/27/2012
• Status: Active Grant

• Current Assignee: Maquet Incorporated (Getinge AB)
• Original Assignee: Maquet Incorporated (Getinge AB)
• Inventors: Jousse, Robin, Valteau, Ccilia, Comte, Lionel
• Granted Patent: US 9,920,906 B2
• Time in Patent Office: Days
• US Class Current: 362/235
• CPC Class Codes: A61B 1/0646 with illumination filters
• CPC Class Codes: F21S 10/007 using rotating transparent or colored disks, e.g. gobo wheels
• CPC Class Codes: F21S 10/026 by movement of parts, e.g. by movement of reflectors or light sources F21S10/007 takes precedence
• CPC Class Codes: F21V 14/08 by movement of the screens or filters
• CPC Class Codes: F21V 23/003 the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
• CPC Class Codes: F21V 33/0068 Medical equipment
• CPC Class Codes: F21V 9/00 Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters coloured shades F21V1/00; elements characterised by cooling arrangements F21V29/502
• CPC Class Codes: F21V 9/04 for filtering out infrared radiation dichroic reflectors F21V7/22; using liquid-filled chambers F21V9/12
• CPC Class Codes: F21V 9/06 for filtering out ultraviolet radiation
• 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: F21V 9/20 Dichroic filters, i.e. devices operating on the principle of wave interference to pass specific ranges of wavelengths while cancelling others
• CPC Class Codes: F21V 9/40 with provision for controlling spectral properties, e.g. colour, or intensity
• CPC Class Codes: F21W 2131/205 for operating theatres
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05K 999/99 dummy group

Abstract

An LED lighting device (6) having an LED (8) emitting white light and optical filter means (12) suitable for filtering the white light emitted by the LED (8). The optical filter means comprise at least two optical filters (12) that have different transmission coefficients and that are positionable to filter the light emitted by the LED (8) individually. The lighting device (6) includes a power supply unit (10) suitable for delivering different power supply currents to the LED (8) depending on whether one or the other of the optical filters (12) is positioned to filter the light from the LED (8), so as to modify the color temperature of the light emitted by the LED (8).

Claims

1. An LED lighting device (6) having an LED (8) emitting white light and optical filter means (12) suitable for filtering said white light emitted by the LED (8), the device being characterized in that said optical filter means comprise at least two optical filters (12) that have different transmission coefficients and that are positionable to filter said light emitted by the LED (8) individually, and in that the lighting device (6) includes a power supply unit (10) suitable for delivering different power supply currents to said LED (8) depending on whether one or the other of the optical filters (12) is positioned to filter said light from the LED (8), so as to modify the color temperature of the light emitted by the LED (8).

2. The lighting device (6) according to claim 1, wherein at least one optical filter (12) is suitable for attenuating a red component of the light emitted by the LED (8).

3. The lighting device (6) according to claim 2, wherein at least one optical filter (12) is suitable for attenuating a blue component of the light emitted by the LED (8) at a wavelength lying in the range 400 nm to 480 nm.

4. The lighting device (6) according to claim 3, having a plurality of consecutive optical filters (12) having progressive transmission coefficients for attenuating the blue component.

5. The lighting device (6) according to claim 4, wherein the attenuation difference between two consecutive optical filters (12) is at least 15%.

6. The lighting device (6) according to claim 5, having a plurality of identical LEDs (8), each emitting white light.

7. The lighting device (6) according to claim 6, wherein each LED (8) is associated with a set of optical filters (12) having different transmission coefficients, the sets of optical filters (12) being identical from one LED (8) to another.

8. The lighting device (6) according to claim 7, wherein said optical filters (12) are arranged on a rotary disk (11).

9. The lighting device (6) according to claim 8, wherein said filters (12) are arranged at the periphery (11A) of said rotary disk (11).

10. A lighting appliance (1) for an operating theater, the appliance being characterized in that it includes at least one lighting device (6) according to claim 1.

11. The lighting device (6) according to claim 1, wherein at least one optical filter (12) is suitable for attenuating a blue component of the light emitted by the LED (8) at a wavelength lying in the range 400 nm to 480 nm.

12. The lighting device (6) according to claim 11, having a plurality of consecutive optical filters (12) having progressive transmission coefficients for attenuating the blue component.

13. The lighting device (6) according to claim 12, wherein the attenuation difference between two consecutive optical filters (12) is at least 15%.

14. The lighting device (6) according to claim 1, having a plurality of identical LEDs (8), each emitting white light.

15. The lighting device (6) according to claim 14, wherein each LED (8) is associated with a set of optical filters (12) having different transmission coefficients, the sets of optical filters (12) being identical from one LED (8) to another.

16. The lighting device (6) according to claim 1, wherein said optical filters (12) are arranged on a rotary disk (11).

17. The lighting device (6) according to claim 16, wherein said filters (12) are arranged at the periphery (11A) of said rotary disk (11).