Wei W Li

US Patent:

8016470, Sep 13, 2011

Filed:

Oct 8, 2008

Appl. No.:

12/287481

Inventors:

Wei Li - South Barrington IL, US
Jamie Swayne - Lake Zurich IL, US
Austin E. Unsworth - Fort Mill SC, US
Nabil Dagher - Charlotte NC, US
H. Thomas Lockamy - Charlotte NC, US

Assignee:

Dental Equipment, LLC - Charlotte NC

International Classification:

F21V 13/00

US Classification:

362573, 362572, 362294

Abstract:

An electrically powered light source including a light emitting diode (LED) having variable chromaticity, which is adapted for use in a dental operatory. A dental operatory lamp includes a thermally conductive housing having a front directed toward the operating area and a rear away from the operating area; a generally elliptical reflector located on the rear of the thermally conductive housing; at least one heat pipe; a plurality of color LEDs projecting light toward the elliptical reflector, the plurality of LEDs being in thermal contact with the at least one heat pipe; and an optical light guide for combining light from said LEDs. Another embodiment of the lamp includes at least two user selectable light spectra, one of said spectra providing white light with color temperature in the range 4000 K-6000 K and one spectra having reduced output in the wavelength range 400-500 nm.

US Patent:

8388205, Mar 5, 2013

Filed:

Sep 13, 2011

Appl. No.:

13/231221

Inventors:

Jamie Swayne - Lake Zurich IL, US
H. Thomas Lockamy - Monroe NC, US
Nabil Dagher - Charlotte NC, US
Wei Li - South Barrington IL, US

Assignee:

Dental Equipment, LLC - Charlotte NC

International Classification:

F21V 7/00
F21S 8/00

US Classification:

362573, 362572, 362555, 362 85, 362231

Abstract:

An electrically powered light source including a light emitting diode (LED) having variable chromaticity, which is adapted for use in a dental operatory. A dental operatory lamp includes a thermally conductive housing having a front directed toward the operating area and a rear away from the operating area; a generally elliptical reflector located on the rear of the thermally conductive housing; at least one heat pipe; a plurality of color LEDs projecting light toward the elliptical reflector, the plurality of LEDs being in thermal contact with the at least one heat pipe; and an optical light guide for combining light from said LEDs. Another embodiment of the lamp includes at least two user selectable light spectra, one of said spectra providing white light with color temperature in the range 4000 K-6000 K and one spectra having reduced output in the wavelength range 400-500 nm.

US Patent:

8408772, Apr 2, 2013

Filed:

Feb 12, 2010

Appl. No.:

12/705411

Inventors:

Wei Li - South Barrington IL, US

Assignee:

Excelitas Technologies LED Solutions, Inc. - Wheeling IL

International Classification:

G02B 6/04
F21V 1/00
H01L 33/00

US Classification:

362554, 362237, 362244, 362268, 362551, 362555

Abstract:

A device comprising a plurality of LEDs arranged in a coplanar array, the coplanar array comprising an LED at the center and LEDs positioned radially symmetrically around the LED at the center, and wherein the central axes of the LEDs are arranged to be parallel to each other; a one-piece lens array collimating light from the LEDs, the lens array comprising a plurality of coplanar lens tiles, the coplanar lens tiles comprising a lens tile at the center and lens tiles positioned radially symmetrically around the lens tile at the center, and wherein the central axis of each of the lens tiles is aligned with the central axis of a corresponding LED; and a focusing lens converging the collimated light from the lens array into a single image in a focal plane, wherein the central axis of the focusing lens is aligned with the central axis of the lens array.

US Patent:

8616751, Dec 31, 2013

Filed:

Mar 10, 2011

Appl. No.:

13/045111

Inventors:

Wei Li - South Barrington IL, US

Assignee:

Excelitas Technologies Corp. - Waltham MA

International Classification:

F21V 7/04

US Classification:

362610, 362600, 362606, 362608, 362612, 362555

Abstract:

A light guide for interfacing between a light source having a light emitting surface with a first shape and a light receiver with a light receiving surface of a second shape. The light guide has a light emitting end having a first shape of substantially the same size as the first shape of the light emitting surface. A light receiving end has a second shape of substantially the same size as the second shape of the light receiving surface. A free form body between the light emitting end and the light receiving end causes a transition between the first and second shape.

US Patent:

20100091507, Apr 15, 2010

Filed:

Oct 5, 2009

Appl. No.:

12/573609

Inventors:

Wei Li - South Barrington IL, US
Scott Carpenter - Elgin IL, US

Assignee:

Opto Technology, Inc. - Wheeling IL

International Classification:

B64D 47/02
F21V 1/00
F21V 9/00
F21V 7/00

US Classification:

362470, 362241, 362231, 36229601, 362294

Abstract:

A high intensity light is disclosed. A first circular lighting array having a plurality of reflectors and light emitting diodes is provided. A second circular lighting array is mounted on the first circular lighting array. The second circular lighting array has a second plurality of reflectors and light emitting diodes. Each reflector includes a tulip-shaped reflective surface having a symmetrical vertical cross section and a different symmetrical horizontal cross section. The reflective surface creates a uniform beam reflecting from a corresponding LED at horizontal angles relative to the reflective surface and a narrow beam in vertical angles relative to the reflective surface.

US Patent:

20180320860, Nov 8, 2018

Filed:

May 2, 2017

Appl. No.:

15/584318

Inventors:

- Waltham MA, US
Wei Li - South Barrington IL, US

International Classification:

F21V 14/00
F21V 5/04
F21V 23/04
A61B 90/30

Abstract:

A luminaire includes multiple light emitting cells. Each light emitting cell has a light source, and a focus-tunable lens (e.g., a liquid lens) associated with the light source. Each respective one of the light emitting cells is independently controllable relative to the one or more other light emitting cells. In a typical implementation, the control of each light emitting cell may involve, for example, controlling a surface of liquid in the corresponding liquid lens.