1805results about "Light guides details" patented technology

In one embodiment of this invention, a lightguide comprises a low refractive index region disposed between light extracting region and a non-scattering region. In further embodiment of this invention, volumetric scattering lightguide comprises a low refractive index region disposed between a volumetric scattering region and a non-scattering region. In some embodiments, a light emitting device comprising a volumetric scattering lightguide can angularly filter light input into the edge of a volumetric scattering lightguide by controlling the refractive index of the low refractive index region relative to the refractive index of the non-scattering region to prevent direct illumination of the volumetric scattering region, provide a luminance uniformity greater than 70%, or improve the angular luminous intensity of the light emitting device. The volumetric scattering lightguide may be curved, tapered, and a light emitting device comprising the same may further comprise at least one light source and a light redirecting element.

A flat planar light fixture formed of a translucent panel with suitable opacity for the transmission of light is illuminated by a plurality of high brightness LEDs disposed along the edges thereof. A layer of reflective material on a back surface of the panel facilitates reflection and dispersion of light that occurs within the panel through a front surface thereof. The LEDs are powered by low-voltage direct current and coupled with an emergency backup battery that is maintained in a charged condition by household current. The light fixture may be operatively connected with a signal receiver that controls the light intensity and turns the LEDs on and off responsive to signals transmitted from a remote signal transmitter. The LEDs may be provided in different colors to allow the user to vary the color of illumination. The light fixture may also be operatively connected with an alarm system.

A runway and taxiway lighting system (of FIG. 1). The system (100) includes a housing (105) as part of a light assembly (102), which light assembly (102) includes a light source (120) for emitting light (123), and a light pipe (126). The light pipe (126) has a first end (124) in close association with the light source (120) for coupling the light (123) thereinto, and a second end (128) from which the light (123) is dispersed. The system (100) also includes a power source encased in a power box (108), and operatively connected to the light assembly (120) for providing power thereto.

The present invention introduces a new class of thin doubly collimating light distributing engines for use in a variety of general lighting applications, especially those benefiting from thinness. Output illumination from these slim-profile illumination systems whether square, rectangular or circular in physical aperture shape is directional, square, rectangular or circular in beam cross-section, and spatially uniform and sharply cutoff outside the system's adjustable far-field angular cone. Field coverage extends from + / −5- to + / −60-degrees and more in each meridian, including all asymmetric combinations in between, both by internal design, by addition of angle spreading film sheets, and angular tilts. Engine brightness is held to safe levels by expanding the size of the engine's output-aperture without sacrifice in the directionality of illumination. One form of the present invention has a single input light emitter, a square output aperture and the capacity to supply hundreds of lumens per engine. A second multi-segment form of the invention deploys one light emitter in each engine segment, so that total output lumens is determined by the number of segments. Both types of thin light distributing engines provide input light collimated in one meridian and a light distributing element that maintains input collimation while collimating output light in the un-collimated orthogonal meridian, in such a manner that the system's far-field output light is collimated in both its orthogonal output meridians. The present invention also includes especially structured optical films that process the engine's doubly collimated output illumination so as to increase its angular extent one or both output meridians without changing beam shape or uniformity.

A showerhead which may be utilized as a source of illumination includes a source of illumination which is efficiently coupled to individual ones of a plurality of water sprays. In an exemplary embodiment, a plurality of fiber-optic members transmit light from one or more individual light sources to corresponding ones of a plurality of individual shower sprays or nozzles. Light from the source of illumination is thus transferred to and is transmitted through a plurality of individual water sprays.

A light source includes a housing, an LED array of individual LED elements mounted in the housing, and a controller mounted in the housing and coupled to the LED array. The controller sequentially, intermittently pulses the LED elements of the LED array. The controller over drives the LED elements of the LED array with a current in excess of several times the continuous forward rating for the individual LED elements. The housing is a substantially closed, waterproof, tubular member and may include a power source in the housing. The light source may form a portable light source. The light source may include a fiber optic bundle coupling in the housing and a fresnel lens between the LED array and the fiber optic bundle coupling.

A light guide containing substantially aligned non-spherical particles provides more efficient control of light scattering. One or more regions containing ellipsoidal particles may be used and the particle sizes may vary between 2 and 100 microns in the smaller dimension. The light scattering regions may be substantially orthogonal in their axis of alignment. Alternatively, one or more asymmetrically scattering films can be used in combination with a backlight light guide and a reflector to produce an efficient backlight system. The light guides may be manufactured by embossing, stamping, or compression molding a light guide in a suitable light guide material containing asymmetric particles substantially aligned in one direction. The light scattering light guide or non-scattering light guide may be used with one or more light sources, collimating films or symmetric or asymmetric scattering films.

An LED light fixture system includes an LED module having a plurality of LEDs attached thereto and directed inwardly toward a secondary optic. The LED module is releasably attached to an interior surface of a peripheral frame. The frame includes an openable portion positioned to allow the LED module to be inserted or removed through an opening created when the openable portion is in an open position. The openable portion is movable from the open position to a closed position and provides an electrical connection between the LEDs attached to the LED module and a source of electrical current when the openable portion is in the closed position.

Textile product comprising light guiding fibres (2) consisting of a central core capable of transmitting the light and of an external sheath, in which at least a length portion of said external sheath presents, in respect to the internal core, a refraction index allowing the transmitted light to partially escape from the fibre; cloth article made from the textile product; and a manufacturing method of the textile product.

A face-lit waveguide illumination system employing a planar slab or plate of an optically transmissive material. A light source is optically coupled a linear optical element which is attached to a face of the waveguide and is configured to inject light at an angle permitting for light propagation by means of a total internal reflection. Light is propagated through the waveguide towards a predetermined direction in response to optical transmission and total internal reflection. Light extraction features located along the prevailing path of light propagation extract light from the waveguide and emit such light towards a surface perpendicular. In one embodiment, the planar waveguide includes a window pane which provides light transport from one location, where light is injected through the face of the pane, to another location where light is extracted. Additional embodiments of the face-lit waveguide illumination system are also disclosed.

The invention is directed to a linear luminous body comprising: a light source; a light source accommodating portion in which the light source is accommodated; and a light guide held by the light source accommodating portion so as to extend from the light source accommodating portion; wherein a light emitted from the light source is introduced into said light guide through an end surface of said light guide.

An enhanced light fixture containing a volumetric, anisotropic diffuser to control the spatial luminance uniformity and angular spread of light from the light fixture is disclosed. The anisotropic diffuser provides increased spatial luminance uniformity and efficient control over the illuminance such that power reductions, reduced cost or reduced size may be achieved. The anisotropic diffuser contains one or more regions of asymmetrically shaped light scattering particles. The spread of illumination of light from a light emitting source can be efficiently controlled by using a thin, low cost, volumetric, asymmetric diffuser to direct the light in the desired direction. This allows the reduction in number of light sources, a reduction in power requirements, or a more tailored illumination. When the anisotropic diffuser is used in combination with a waveguide to extract light, the light is efficiently coupled out of the waveguide in a thin, planar surface. This transmissive diffuser can be coupled to a reflecting element such that the resulting combination is a light reflecting element with a desired asymmetric light scattering profile.

An enhanced light fixture containing a volumetric diffuser to control the spatial luminance uniformity and angular spread of light from the light fixture is disclosed. The volumetric diffuser provides increased spatial luminance uniformity and efficient control over the illuminance such that power reductions, reduced cost or reduced size may be achieved. The volumetric diffuser contains one or more regions of volumetric light scattering particles. The spread of illumination of light from a light emitting source can be efficiently controlled by using a thin, low cost, volumetric, diffuser to direct the light in the desired direction. This allows the reduction in number of light sources, a reduction in power requirements, or a more tailored illumination. When the volumetric diffuser is used in combination with a waveguide to extract light, the light is efficiently coupled out of the waveguide in a thin, planar surface. This transmissive diffuser can be coupled to a reflecting element such that the resulting combination is a light reflecting element with a desired light scattering profile.

An enhanced light fixture containing a volumetric, anisotropic diffuser to control the spatial luminance uniformity and angular spread of light from the light fixture is disclosed. The anisotropic diffuser provides increased spatial luminance uniformity and efficient control over the illuminance such that power reductions, reduced cost or reduced size may be achieved. The anisotropic diffuser contains one or more regions of asymmetrically shaped light scattering particles. The spread of illumination of light from a light emitting source can be efficiently controlled by using a thin, low cost, volumetric, asymmetric diffuser to direct the light in the desired direction. This allows the reduction in number of light sources, a reduction in power requirements, or a more tailored illumination. When the anisotropic diffuser is used in combination with a waveguide to extract light, the light is efficiently coupled out of the waveguide in a thin, planar surface. This transmissive diffuser can be coupled to a reflecting element such that the resulting combination is a light reflecting element with a desired asymmetric light scattering profile.

The present invention introduces a new class of thin doubly collimating light distributing engines for use in a variety of general lighting applications, especially those benefiting from thinness. Output illumination from these slim-profile illumination systems whether square, rectangular or circular in physical aperture shape is directional, square, rectangular or circular in beam cross-section, and spatially uniform and sharply cutoff outside the system's adjustable far-field angular cone. Field coverage extends from + / −5- to + / −60-degrees and more in each meridian, including all asymmetric combinations in between, both by internal design, by addition of angle spreading film sheets, and angular tilts. Engine brightness is held to safe levels by expanding the size of the engine's output-aperture without sacrifice in the directionality of illumination. One form of the present invention has a single input light emitter, a square output aperture and the capacity to supply hundreds of lumens per engine. A second multi-segment form of the invention deploys one light emitter in each engine segment, so that total output lumens is determined by the number of segments. Both types of thin light distributing engines provide input light collimated in one meridian and a light distributing element that maintains input collimation while collimating output light in the un-collimated orthogonal meridian, in such a manner that the system's far-field output light is collimated in both its orthogonal output meridians. The present invention also includes especially structured optical films that process the engine's doubly collimated output illumination so as to increase its angular extent one or both output meridians without changing beam shape or uniformity.

An LED light source has a housing having a base. A core projects from the base; is substantially cylindrical and is surrounded by tubes. The core and the base are arrayed about a longitudinal axis. A circuit board in the base supports LEDs. Each of the LEDs is positioned with one of the tubes in a one-to-one relationship at one end of the core. A heat sink is positioned in a heat-transferring relationship with the circuit board and a first reflector is attached to another end of the core. To direct the light emitted by the LEDs from the source to the reflector, the interior of the tubes can be plated with a highly reflective material. In one embodiment, each of the tubes is fitted with a light guide, each light guide extending from a position immediately above one of the LEDs to a position adjacent the reflector.

A lighting system comprising a track having a first and a second rail (5, 7), mutually extending equidistantly. Said first and second rail comprise a first respectively a second electrically conductive strip (13, 15), mutually electrically isolated. A lighting module comprising a first and second electrical contact, which lighting module in mounted position rests by gravitational force on the first and second rail. When mounted the first and second electrical contact are in electrical contact with a respective one of the first and second electrically conductive strip. The lighting module is dismountable from the track by a single displacement of the lighting module in a direction against the direction of the gravitational force.

A light guiding device for an illumination device, especially for a motor vehicle or an indicator device in a rearview device of a motor vehicle includes a light coupling side for incoupling light from a light source, a reflection side having a reflection layer; and a light outcoupling side, which is disposed generally opposite the reflection side. A clearance between the reflection side and the light outcoupling side generally decreases as the distance from the light incoupling side increases. The reflection side having the reflection layer is configured so that light arriving from the light incoupling side is deflected to the light outcoupling side. The reflection layer may be a paint or lacquer layer that is imprinted or evaporation-coated on the reflection side.

Extended area lighting devices, which are useful e.g. as luminaires, include a light guide and diffractive surface features on a major surface of the light guide. The diffractive surface features are tailored to extract guided-mode light from the light guide. The light guides can be combined with other components and features such as light source(s) to inject guided-mode light into the light guide, light source(s) to project light through the light guide as non-guided-mode light, a framework of interconnected support members (attached to multiple such light guides), and / or a patterned low index subsurface layer that selectively blocks some guided mode light from reaching the diffractive surface features, to provide unique and useful lighting devices. Related optical devices, and optical films having diffractive features that can be used to construct such devices and light guides, are also disclosed.

In one aspect, the present invention provides light emitting devices, including light fixtures and luminaires. In some embodiments, a light emitting device comprises at least one light source, a lightguide operable to receive light from the at least one light source at a first location on the lightguide, at least one light extraction region optically coupled to the lightguide and a substantially non-scattering region along a portion of the lightguide.

A refraction-type LED ceiling lamp, especially a plate-type ceiling lamp which is used on an indoor ceiling, includes primarily a fiber light guide plate, a reflection surface of which is provided with multiple chip-shape reflection elements, distributed in arrays. A chip size of the reflection elements decreases gradually toward an entrance surface by a geometric series; whereas, a gap between the reflection elements increases gradually. A reflection curve of the reflection element allows light to be projected out uniformly and a required illumination angle to be achieved.

A modular light source system forms a plurality of distinct light sources with a common tubular metal housing, an LED based lighting element for each light source, and a pair of end caps on opposed ends of the metal housing for each light source. Each distinct lighting source is comprised of one of the LED based lighting elements and a given pair of the end caps, whereby distinct light sources can be formed through replacement of the LED based lighting elements and the end caps.

A lighting arrangement (1) of a space-saving configuration, including a fluorescent lamp (2) and at least one light emitting diode (6), which is suitable in particular for use for interior lighting of an aircraft. In this case the light emitting diode (6), viewed in the direction of a main lighting direction (13), is arranged behind the fluorescent lamp (2). The lighting arrangement (1) further includes a light guide element (10) which is adapted to guide light (L2) emitted by the light emitting diode (6) past the fluorescent lamp (2) and emit it substantially in the main lighting direction (13).

A light source unit capable of considerably reducing the size of a vehicular lamp. An LED is mounted on an optical axis extending in the longitudinal direction of the vehicle with its light output directed upward, and a reflector is provided above the LED having a first reflecting surface for collecting the light emitted by the LED and reflecting the light generally in the direction of the optical axis Ax. The reflector is formed by a reflective coating formed on the surface of a translucent block covering the LED. Consequently, the size of the reflector can be considerably reduced as compared with reflectors employed in conventional vehicular lamps. Moreover, since the LED used as a light source emits little heat, the reflector can be designed without having to take into account the influence of heat generated by the light source. Furthermore, the LED can be treated substantially as a point light source so that proper reflection control can be carried out even if the size of the reflector is reduced. By mounting the LED so that its light output is directed substantially orthogonal to the optical axis Ax, moreover, it is possible to effectively utilize most of the light emitted by the LED and reflected by the first reflecting surface.

A fiber optic fabric includes woven optical fibers, an opaque coating on the fibers and openings on the high points of the weave. The opaque coating prevents light leakage from the fibers and the openings allow light to be emitted from the fabric in a directed manner. The fabric is capable of emitting light at an angle relative to the surface of the fabric such that the light is not visible from every viewpoint.

A light fixture converts source light from one or more solid state light emitting elements to a virtual light source output. An optical element receives and diffuses light from the solid state emitters to form a processed light for the virtual source output. The optical element forms light that is relatively uniform, for example having a substantially Lambertian distribution and / or having a maximum-to-minimum intensity ratio of 2 to 1 or less over the optical area of the virtual source. In the examples, the diffuse optical processing element comprises a cavity having at least one diffusely reflective surface, and the emitting elements supply light into the cavity at locations that result in reflection and diffusion before emission through an aperture of the cavity. The aperture or a downstream processing element appears as the virtual source of the processed light from the cavity.