MEMS WAVELENGTH CONVERTING LIGHTING DEVICE AND ASSOCIATED METHODS

• US 20120250137A1
• Filed: 03/28/2011
• Published: 10/04/2012
• Est. Priority Date: 03/28/2011
• Status: Active Grant

• Current Assignee: Healthe, Inc.
• Original Assignee: Lighting Science Group Corporation (Pegasus Capital Advisors, L.P.)
• Inventors: Maxik, Fredric S., Soler, Robert R., Bartine, David E., Zhou, Ran, Bastien, Valerie A.
• Granted Patent: US 8,384,984 B2
• Time in Patent Office: Days
• US Class Current: 359/291
• CPC Class Codes: G02B 26/08 for controlling the direction of light in light guides G02B6/35
• CPC Class Codes: G02B 26/0833 the reflecting element being a micromechanical device, e.g. a MEMS mirror, DMD G02B26/0825 takes precedence; micromechanical devices in general B81B
• CPC Class Codes: H04N 9/3185 Geometric adjustment, e.g. keystone or convergence optical or mechanical adjustment of convergence H04N9/317; using scanning means H04N3/22; optical or mechanical adjustments of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3194 including sensor feedback

Abstract

A lighting device is described for receiving source light within a predetermined source wavelength range, converting the source light into a converted light, and reflecting the converted light to a desired output direction. The lighting device may use a micro electromechanical system (MEMS) device to receive and redirect the source light to the desired output direction. A conversion coating may be applied to the operative surface of the MEMS device to convert the source light into a converted light.

Claims

1. A lighting device for directing source light within a predetermined source wavelength range in a desired output direction, the lighting device comprising:

a micro electromechanical system (MEMS) device that includes at least one operative surface to receive and redirect the source light towards the desired output direction;

a conversion coating, that includes a phosphorous wavelength coating material, applied to the at least one operative surface to convert the source light into a converted light within a predetermined at least one converted wavelength range;

wherein the MEMS device is a digital micromirror device (DMD) that includes an array of mirrors positionable between multiple angles to reflect the converted light; and

wherein the predetermined source wavelength ranges includes a plurality of wavelength ranges that are selectively enabled.

2. A lighting device according to claim 1 wherein the source light is a monochromatic light.

3. A lighting device according to claim 1 wherein the source light is a bichromatic light.

4. A lighting device according to claim 1 wherein the source light is a polychromatic light.

5. A lighting device according to claim 1 wherein the predetermined source wavelength range is within at least one of a blue spectrum and an ultraviolet spectrum.

6. A lighting device according to claim 5 wherein the predetermined source wavelength range of the source light within the ultraviolet spectrum is between 200 nanometers and 400 nanometers.

7. A lighting device according to claim 5 wherein the predetermined source wavelength range of the source light within the blue spectrum is between 400 nanometers and 500 nanometers.

8. A lighting device according to claim 1 further comprising a position detecting device;

and wherein the desired output direction includes a projection surface.

9. A lighting device according to claim 8 wherein the position detecting device senses a location of the projection surface to define a location of a sensed projection surface.

10. A lighting device according to claim 9 further comprising a repositioning device that repositions the MEMS device to project the converted light to the location of the sensed projection surface.

11. A lighting device according to claim 1 further comprising at least one light source that generates the source light in the predetermined source wavelength range.

12-36. -36. (canceled)