Philips Lighting Holding B.v.

Koninklijke Philips Corporation N.V.

Peter Isaac Goldstein

Eric Anthony Roth

Oliver Dross

Brian Roberge

Benjamin Daniel Sweet-Block

A lighting unit () configured to illuminate a surface () having a proximal portion () and a distal portion () in relation to the lighting unit. The lighting unit includes a light source () configured to emit a light beam (), and an optic () positioned between the light source and the surface to modify the emitted light beam to have a largely uniform vertical illumination distribution along the surface. The input surface () of the optic faces the light source and has a convex lens portion () that directs a portion of the emitted light beam at the distal portion of the surface, and a concave lens portion () that directs a portion of the emitted light beam at the proximal portion of the surface.

Forward throw asymmetric optic design

Disclosed is a lighting system () that illuminates a surface () with a uniform illumination pattern (). The lighting system includes a plurality of lighting units () that each emit a light beam that has a variable vertical illumination distribution and a variable horizontal illumination distribution. The intensity of each light beam is uniform in a central region of the horizontal illumination distribution, and non-uniform at each end of the horizontal illumination distribution. Similarly, the intensity of each light beam is uniform in a central region of the vertical illumination distribution, and largely non-uniform at each end of the vertical illumination distribution. The light beams overlap in the region of horizontal nonuniformity in order to create an illumination pattern that appears uniform.

Method and apparatus for uniform illumination of a surface

Methods and apparatus are provided for producing mixed light in a direct-view luminaire. The luminaire includes a plurality of light sources () that, in combination, are configured to generate a plurality of different colors of light, a first light mixing chamber () and at least one second light mixing chamber () in light communication with the first mixing chamber through at least one opening (). At least one directly viewable light exit surface () is coupled to the first light mixing chamber. The light sources are contained in the second light mixing chamber(s), which is configured to prevent light emitted from the light sources from directly impinging on the light exit surface(s). The first light mixing chamber and the light exit surface(s) are configured to mix the light emitted from the light sources such that all light exiting the light exit surface(s) is substantially uniform in brightness and color.

LED-based direct-view luminaire with uniform mixing of light output

Disclosed is an LED-based luminaire () including an optic surrounding a plurality of LEDs (). The optic may include a plurality of interior reflective surfaces for mixing light output of the LEDs and also include a transmissive diffuser () through which interiorly reflected light output of the LEDs exits the LED-based luminaire.

Growing community of inventors

Medford, MA, United States of America

Peter Isaac Goldstein