Thomas M Marshall

US Patent:

6443594, Sep 3, 2002

Filed:

Mar 31, 2000

Appl. No.:

09/540390

Inventors:

Thomas M. Marshall - Hartsdale NY
Gerard Harbers - SHertogenbosch, NL
Michael D. Pashley - Cortland Manor NY
Stephen Herman - Monsey NY

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

F21V 504

US Classification:

362244, 362236, 362237, 362241

Abstract:

A lens array for a lamp directs light to a light conduit such as an optical fiber or light pipe for guiding light to a remote location. An array of LED serve as light sources. The lens array includes an integrally formed member having a number of collimator lenses positioned in the lens array so that each lens can operate as a collimator for a corresponding LED to produce a respective collimated beam of light. The lenses have optical properties that are optimized according to where their corresponding LED are positioned in the LED array, so that the lens array is provided with lens prescriptions that produce refraction of the collimated beams of light toward an entrance aperture of the light conduit.

US Patent:

6445139, Sep 3, 2002

Filed:

Sep 15, 2000

Appl. No.:

09/663050

Inventors:

Thomas M. Marshall - Hartsdale NY
Michael D. Pashley - Cortlandt Manor NY

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

G05F 100

US Classification:

315291, 315149, 315307, 315360, 250226

Abstract:

A luminaire comprises an array of LEDs that include at least one LED in each of a plurality of colors. Supplied to the LEDs for each color is an electrical current that, during a measuring period, comprises a measuring drive pulse having at least a first boost portion and a turn-off portion. The LEDs relating to each color have a light output which has a nominal continuous value during ordinary operation and increases during the boost portion and is interrupted during the turn-off portion. The array has a combined light output when current is supplied to all of the LEDs in the array. A photodiode is arranged to measure the combined light output which selectively turning off the electrical current to the LEDs so that the photodiode measures the light output for each color separately in response to the measuring drive pulse. The average light output during the measuring period is substantially equal to the nominal continuous light output during the ordinary operation so as to avoid visible flickers.

US Patent:

6513949, Feb 4, 2003

Filed:

Dec 2, 1999

Appl. No.:

09/453420

Inventors:

Thomas M. Marshall - Hartsdale NY
Michael D. Pashley - Cortlandt Manor NY
Stephen Herman - Monsey NY

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

F21V 900

US Classification:

362231, 362800, 313502

Abstract:

A hybrid lighting system for producing white light including at least one light emitting diode and phosphor-light emitting diode. The hybrid lighting system exhibits improved performance over conventional LED lighting systems that use LEDs or phosphor-LEDs to produce white light. In particular, the hybrid system of the invention permits different lighting system performance parameters to be addressed and optimized as deemed important, by varying the color and number of the LEDs and/or the phosphor of the phosphor LED.

US Patent:

6547416, Apr 15, 2003

Filed:

Dec 21, 2000

Appl. No.:

09/746034

Inventors:

Michael Pashley - Cortlandt Manor NY
Thomas Marshall - Hartsdale NY

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

F21V 700

US Classification:

362231, 362235, 362296

Abstract:

A light source includes an array of LED components in each of a plurality of colors such as red, green, and blue in the entrance aperture of a tubular reflector which has an exit aperture, an optic axis extending between the apertures, and a reflective circumferential wall extending between the apertures to reflect and mix light from the array of LED components. At least a portion of the circumferential wall of the reflector body has a polygonal cross-section taken normal to the optic axis, and at least a portion of the cross-section taken parallel to the optic axis includes segments of a curve joined one to the next to form a plurality of facets for reflecting light from the LED components to said exit aperture. Preferably, the segments of the curve included in the cross-section of the reflector body taken parallel to the optic axis are contiguous, linear trapezoidal facets.

US Patent:

6547423, Apr 15, 2003

Filed:

Dec 22, 2000

Appl. No.:

09/747483

Inventors:

Thomas Marshall - Hartsdale NY
Michael Pashley - Cortlandt Manor NY

Assignee:

Koninklijke Phillips Electronics N.V. - Eindhoven

International Classification:

F21V 500

US Classification:

362333, 362326, 362327, 362328, 362334, 362335, 362336, 362350, 362364, 362255

Abstract:

An LED module that includes an LED (light-emitting diode) and a rotationally symmetrical, bowl-shaped collimator lens is provided. The collimator lens has an inner refractive wall, an outer reflective wall, a first surface having an entrance aperture with a recess in which the LED is situated and which collimator lens is also provided with a second surface from which light generated by the LED emerges, the normal to the surface extending substantially parallel to the axis of symmetry of the lens, and the LED module also includes one or more of the following structures: (1) a conic wall portion of the recess of the inner refractive wall at the entrance aperture that includes a curved portion, and an outer reflective wall so configured in accordance with the structure of the inner refractive wall to achieve substantial collimation of a source of light at the entrance aperture; and/or (2) a first surface of the lens that is recessed away from the LED source; and/or (3) two surfaces of said refractive wall between which the refractive function of said refractive wall is divided. The LED module offers an improvement in the performance of the Flat top Tulip Collimator disclosed and claimed in our co-pending application Ser. No. 09/415,833 in terms of reduced size, beam divergence, beam uniformity, and to some degree efficiency.

US Patent:

6692136, Feb 17, 2004

Filed:

Nov 22, 2002

Appl. No.:

10/302315

Inventors:

Thomas M. Marshall - Hartsdale NY
Michael D. Pashley - Cortlandt Manor NY
Stephen Herman - Monsey NY

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

F21V 900

US Classification:

362231, 362230, 362800

Abstract:

A hybrid lighting system for producing white light including at least one light emitting diode and phosphor-light emitting diode. The hybrid lighting system exhibits improved performance over conventional LED lighting systems that use LEDs or phosphor-LEDs to produce white light. In particular, the hybrid system of the invention permits different lighting system performance parameters to be addressed and optimized as deemed important, by varying the color and number of the LEDs and/or the phosphor of the phosphor LED.

US Patent:

6693698, Feb 17, 2004

Filed:

Jul 22, 1998

Appl. No.:

09/120620

Inventors:

Thomas Marshall - Hartsdale NY
Kevin W. Haberern - Cary NC

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

G02F 11343

US Classification:

349148, 349147, 349138

Abstract:

A display device is provided which includes a first substrate having at least one transparent, first picture electrode of a first material, a second substrate having at least one second picture electrode of a second material which, jointly with the picture electrode on the first substrate and an intermediate opto-electronic material, defines a pixel, and means for supplying electric voltages to the picture electrodes, wherein at least one of the picture electrodes is coated with at least one layer of a passivating material such that any asymmetry in operation of the device is substantially reduced or eliminated.

US Patent:

6726341, Apr 27, 2004

Filed:

Oct 12, 2001

Appl. No.:

09/976327

Inventors:

Michael D. Pashley - Cortlandt Manor NY
Thomas M. Marshall - Hartsdale NY
Ans Saalberg - Einchoven, NL
Larry McColloch - San Jose CA

Assignee:

Koninklijke Philips Electronics N.V. - Eindhoven

International Classification:

F25D 2700

US Classification:

362 92, 362133, 362231, 362295, 362555, 362562

Abstract:

A storage compartment is equipped with a light emitting diode (LED) light source for illuminating contents inside the compartment. The LED light source includes a LED light engine outside the compartment and a light guide inside the compartment. The light guide is optically coupled to be LED light engine to bring light from the LED light engine into the compartment for providing illumination inside the compartment. The LED light engine may include red, green, and blue LEDs that contribute to the illumination inside the compartment. Respective outputs of the red, green, and blue LEDs may be separately controllable to allow a variably controlled color point of illumination inside the compartment. Total output of the LED light engine may be controllable to vary intensity of illumination inside the compartment.