1541 results about "Point light" patented technology

A chromatic confocal technique and apparatus for the rapid three-dimensional measurement of an object shape, particularly of a tooth in a patient's jaw, using an array of polychromatic point light sources, a planar detector matrix, a beam splitter for lateral spectral separation, and an objective for illuminating and recording the object. Spectral defined reference light bundles are generated, injected into the detection beam path via a reference beam path and, following spectral splitting, are focused on the detector matrix as reference image points, wherein laterally shifted sub-matrices are numerically defined on the detector matrix for spectral analysis of the object light, which sub-matrices are implemented as spectral cells for three-dimensional measurement of the shape of the object.

In this surface light source device, light is incident from a plurality of point light sources 2 arranged on a one side end surface of a light guide plate 1, is reflected on a light reflecting surface 11 on a rear surface of the light guide plate 1, and is emitted from a front surface of the light guide plate 1. The point light sources 2 comprise white light emitting diode elements. Two white light emitting diode elements out of six of the white light emitting diode elements having chromaticity outermost from a center of an aimed chromaticity range in opposite hue directions are arranged in an approximately center of a group of the white diode elements.

The present invention is directed to systems and methods for all-frequency relighting by representing low frequencies of lighting with spherical harmonics and approximate the residual high-frequency energy with point lights. One such embodiment renders low-frequencies with a precomputed radiance transfer (PRT) technique (which requires only a moderate amount of precomputation and storage), while the higher-frequencies are rendered with on-the-fly techniques such as shadow maps and shadow volumes. In addition, various embodiments are directed to a systems and methods for decomposing the lighting into harmonics and sets of point lights. Various alternative embodiments are directed to systems and methods for characterizing the types of environments for which the described decomposition is a viable technique in terms of speed (efficiency) versus quality (realism).

The invention discloses an LED (Light Emitting Diode) lamp tube, which comprises a glass tube, lamp caps arranged at two ends of the glass tube as well as an LED lamp strip arranged in the glass tube, wherein the inner wall of the glass tube is coated with a light increasing and heat radiating film; and the LED lamp strip is fixedly adhered to the inner wall of the glass tube through a high heat conduction bonding adhesive. The light increasing and heat radiating film is an aluminum-coated layer, or a frosted heat conduction light increasing adhesive layer or a nano adhesive layer capable of increasing light and radiating heat. The LED lamp strip comprises a substrate, wherein a plurality of LED light sources are welded on the substrate, or an integrated light source consisting of an LED chip is packaged on the substrate; and a driving power supply module is also arranged on the LED lamp strip. According to the LED lamp tube disclosed by the invention, the light emitting efficiency, the light emitting angle and the illumination area of the LED lamp tube are increased; the problems of glare and point light existing in the LED lamp tube are solved; heat generated by an LED is transmitted to the whole glass tube through the substrate of the LED, so that the heat radiating area is greatly increased and the heat increasing speed of the LED lamp tube is increased; the LED lamp tube can be applied to a lamp holder of a traditional fluorescent lamp, and thus the generality of the LED lamp tube is greatly improved; and the replacement and use costs are reduced.

The present invention provides a luminaire comprising an housing having thermally separate compartments for an electronics portion and a lighting portion. These thermally separate compartments can provide a means for providing thermal isolation between the respective components, namely the electronics portion and the lighting portion. In this manner thermal interaction between these portions can be reduced, thereby improving performance of the luminaire. The lighting portion comprises a plurality of light-emitting elements and further includes optics for the manipulation of illumination created by the light-emitting elements. A power supply for supply of energy to the light-emitting elements and a controller for controlling application of energy from a power source to the light-emitting elements is provided in the electronics portion and can be thermally separated within the electronics portion. Moreover, an optical device comprising two linear diffuser elements can be used to further improve the light emission characteristics of the light-emitting elements thereby providing a directly viewable luminaire wherein the illumination produced by point light sources appears uniform along the length of the luminaire.

A surface light-source device (50) includes: a plurality of point light sources (2); a light-guide plate (4) arranged for emitting from its emitting surface the light incident on one lateral side thereof from the point light sources (2); a lower case (10) having a lateral side formed approximately in parallel to the incident surface of the light-guide plate (4); and a light-source substrate (3) on which the plurality of point light sources (2) are arranged at predetermined intervals, disposed on the light-guide plate (4) side; wherein the surface light-source device (50) is provided with a substrate holder (8) that clamps the light-source substrate (3) and the lateral side of the lower case (10) by projections arranged on the substrate holder (8) between adjacent two of the light sources (2).

A light expanding system for converting light beams generated from point-like light sources into a collimated planar light beam is described herein. The light expanding system is especially suitable for backlighting a liquid crystal flat panel display or other such arrangement requiring backlighting with LEDs as the light source. According to an embodiment of the invention, a system for producing a planar light beam includes a light pipe with microprisms on one of its surfaces, and a beam collector which has microprisms in a plane perpendicular to the microprisms in the light guide. According to another embodiment, the light guide has microprisms on two opposite surfaces, and is capable of multiple mode operation. This multiple mode backlight is capable of illuminating a given active area uniformly with light of different spectrum.

The present invention combines point light sources in combination with a light guide element and light redirecting elements into a system which can emit light across one or more extended surfaces of the light guide and may be designed to be able to emit light uniformly across the extended surfaces. The system comprises one or more light-emitting elements and a light guide in which are defined one or more voids. The light-emitting elements are optically coupled to the light guide by positioning them adjacent to a surface of the light guide, or by positioning them proximal to one or more of the voids. One or more light-emitting elements can be optically coupled to one void such that they emit light into the light guide substantially through that void and not through any other void of the one or more voids. Optically coupled to the light guide are a plurality of light redirecting elements for altering of the propagation of light through the light guide, thereby enabling light to be emitted from the surface of the light guide in a desired pattern, for example in a uniform illumination pattern.

A backlight assembly includes a circuit board and a plurality of point light source groups. The plurality of point light source groups includes N point light sources that generate different respective colors and being arranged on the circuit board. Here, N is a number of point light sources. One light source group of the light source groups is rotated by an angle of predetermined degrees in a clockwise direction or a counter-clockwise direction with respect to another light source group that is adjacent to the one point light source group.

A light guide optical system guides a plurality of light beams emitted from a plurality of point light sources arranged linearly to a predetermined surface. The light guide optical system has a plurality of optical surfaces arranged periodically in the arrangement direction of the plurality of point light sources. Each of the plurality of optical surfaces has power in the arrangement direction of the plurality of point light sources.

A positional marker system is disclosed. The positional marker system includes at least one light-emitting or light-reflecting marker that can be positionally detected by an optical tracking system, such as a medical tracking system, wherein the emitting and / or reflecting portion of the marker or markers is formed as a point light source and / or point light reflector.

A lighting device used in an image forming apparatus includes point light sources that emits rays; and a condensing body that is arranged in a direction of the rays emitted from the point light source and that condenses the rays on a surface of a document, which is placed on a contact glass, within a reading width in a sub-scanning direction of the document. The condensing body is arranged in a direction in which angles of all rays, which pass through the condensing body, are smaller than a critical angle of total reflection on the contact glass.

A backlight module includes a light guide plate, a bar member, and two point light sources. The bar member is connected to one side of the light guide plate with a slot being formed between them. The bar member has a light emitting surface facing the light receiving surface of the light guide plate and a light reflecting surface opposite to the light emitting surface, and the light emitting surface and the light receiving surface are spaced apart from each other by the slot. The light receiving surface of the light guide plate and the light emitting surface of the bar member are both bent toward or away from the light reflecting surface.

A backlight unit includes a point light source circuit board, a plurality of point light sources mounted onto the point light source circuit board, and an optical plate having a first surface that faces toward the point light source and is formed with an accommodating part to accommodate the point light source.

The invention provides an LED display screen and a three-dimensional display device thereof. A short-wavelength LED chip array is utilized for sending light, the light penetrates through a short-wave filter coating to irradiate the light conversion material to give out light or to be directly emit out, and then color display is achieved. On that basis, a diffusion barrier, a brightening film and a parallax barrier optical grating are arranged to achieve three-dimensional display. Compared with the prior art, only one LED chip needs to be driven, and a driving circuit is simple, stable and reliable. Due to the fact that the photoluminescence of quantum dots and other materials is utilized for achieving displaying, after the light penetrates through the diffusion barrier and the brightening film, the point light source of each pixel is changed into an area light source, tenderness during watching is achieved, the color gamut is high, and moire fringes can be effectively reduced.

A number of laser beam stations emit vertically separated parallel planes and / or ray-planes of laser light that can be discriminated by their respective plane elevations, modulation of the laser light, time synchronizing, etc. Identifying the laser plane would also imply an identification of the source laser beam station, and thus a precise indication of the elevation at the point of optical intercept. Alternatively, a single laser beam station is used that can emit several different monochromatic color planes and / or ray-planes of laser light. Monochromatic laser diodes, for example, are used for point-light sources and rotating or on-end conical mirrors are used to convert the diode laser light to the required monochromatic color planes and / or ray-planes of laser light. Receivers, generally held on masts attached to motor grader, bulldozer, loader, and excavator machines are used to sense the vertical reference position of the monochromatic color planes and / or ray-planes of laser light, relative to the earth cutting blade of the machine. Fixed-color filters, color filter wheels, and / or linear array photodetectors are used to discriminate amongst the colors and to exactly sense the plane of intersection with the machine. The results of the sensing are either displayed to an equipment operator for manual adjustment of the blade to an automatic servo control system connected to hydraulically control the blade.

A planar light source device includes: a plurality of point light sources, each of which emits a light; a light guide plate that includes a first surface, and a second surface perpendicular to the first surface, and that is configured to guide the emitted lights incident from the first surface to be emitted from the second surface; a bottom case including a side portion substantially parallel to the first surface; a light source substrate that includes the plurality of point light sources arranged thereon at a predetermined interval, and that is arranged at a side of the first surface; a frame that sandwiches the light source substrate and the side portion of the bottom case and holds the second surface and that includes a plurality of gaps at positions facing the point light source.

[Purpose] To provide a surface illumination fixture using a point light source having strong directivity.[Constitution] In the surface illumination fixture 3 including a surface illumination light-source device 6 converting light from a plurality of point light sources 36 having strong directivity into surface illumination and an illumination fixture main body 41, the surface illumination light-source device 6 includes a casing 30 having a flat plate part 35 being used to attach the surface illumination light-source device to the illumination fixture main body, lateral plate parts standing from the flat plate part, and an opening on a surface opposite to the flat plate part, and includes a light-guide reflection plate covering the opening. The flat plate part 35, the lateral plate parts 32 and 33, and the light-guide reflection plate 40 are formed by members having a high light reflectance and a low light transmittance. The light-guide reflection plate 40 is formed to have a lower light reflectance and a higher light transmittance as the distance from the corresponding point light source increases. The illumination fixture main body 41 having attaching means for attachment to a ceiling or a wall.

A light-emitting module includes a light guide plate and a light source unit in accordance with an embodiment. The light guide plate include an upper surface, a lower surface facing the upper surface, a plurality of side surfaces connecting the upper surface and the lower surface, and a cross-sectional surface connected to at least one of the side surfaces. The light source unit includes a substrate disposed in correspondence with the cross-sectional surface and a point light source mounted on the substrate to emit light to the cross-sectional surface. Thus, light-emitting efficiency may be enhanced and the arrangement of point light sources may be optimized, so that a required amount of emitted light may be obtained using a small number of the point light sources. In addition, uniformity of luminance and heat-radiating efficiency may also be enhanced.

To obtain a planar light source which is free from brightness variations or chromaticity variations by using a point light source having a high directivity for emitted light, and to provide a liquid crystal display device capable of obtaining superior display characteristics by using this planar light source device. A planar light source device having an opening in the upper surface comprises a hollow box, a diffusion plate disposed in the opening, a reflecting plate disposed on the bottom of the hollow region of the box, and a plurality of point light sources disposed in a row along at least one side surface of the box. This planar light sources device is characterized by including a refracting element disposed parallel to the row of point light sources and between the point light sources and the hollow region for refracting the light from the point light sources, whereby the light at an incident angle at which the brightness is greatest in the luminous intensity distribution of the light radiated to the irradiation subject surface of the refracting element is refracted to the bottom surface of the box by the refracting element.

An object of the present invention is to provide a liquid-crystal display device which includes a diffuser board that does not produce striped mura on the surface of a liquid crystal panel even if point light sources are used as light sources of a backlight.A backlight apparatus 103 is provided with a diffuser board 103b having diffusion portions 103b1. At each of the diffusion portions 103b1, the light L emitted by a LED module 104 included in a light source unit 103a is reflected by prism patterns P and diffused around the LED module 104. Then, the diffused light is reflected again by a reflecting surface formed on the inner surface of a housing 103c and emitted from the backlight apparatus 103, thereby achieving illuminating light without mura.

A point light source includes a light-emitting element, an optical lens, and at least two reflective members. The light-emitting element emits a point light. The optical lens is disposed over the light-emitting element. The reflective members are disposed in the optical lens. The reflective members confine an optical path of the light emitted from the light-emitting element, thereby substantially preventing the illumination areas of the point light sources from overlapping each other.

The invention relates to a chromatic confocal technique method and arrangement for the rapid three-dimensional measurement, in particular, of object shape, more particularly of a tooth in the jaw of a human being with an array of polychromatic point light sources, a planar detector matrix, arranged before means for lateral spectral separation and an objective for object illuminating and recording. According to the invention, spectral defined reference light bundles are generated also using components of the arrays of point light sources for chromatic calibration, wherein said reference light bundles are injected into the detection beam path via a reference bean path for chromatic lateral separation and then focused on the detector matrix as reference image points. Spectral reference points are calculated at the detector matrix positions and sub-matrices for spectral analysis of object light are digitally stored with pixel accuracy by means of the above positions which then serve for obtaining measurement points such that the detector matrix may be completely filled out with oblong sub-matrices, the planar array is arranged on the planar detector matrix rotated about an acute angle to the spectral axis, wherein the rotation is carried out about the optical axis (OA) of the arrangement, such that a connecting line of point light sources on projection thereof in the plane of the detector matrix includes an acute angle there with the spectral axis, the λ-axis.

A system for illuminating panels such as advertising display panels is provided. Such illuminated panels can be operated very efficiently, cost-effectively and with minimal maintenance once installed in the field. In one embodiment, the illuminated panel includes a panel frame with one or more illuminated frame member. Additional illuminated frame member(s) may be needed depending on the overall dimensions of the illuminated panel. The inside surface of the illuminated frame member should be reflective to increase the light transmission efficiency of the panel. A row of point light sources, e.g., a row of light emitting diodes, is located within the illuminated frame member. The panel frame encloses a light diffusion layer, e.g., an acrylic sheet, with a diffusion edge facing the row of point light sources. The diffusion edge has a surface roughness configured to diffuse light emitted by the row of point light sources. Suitable surface roughness can be accomplished by saw cuts or sanding the light diffusion layer with a suitable grit. In some embodiments, the illuminated frame member has an internal profile to better focus the light emitted by the light sources towards the diffusion edge. Suitable internal profiles include rounded profiles such as parabolic and elliptical shapes. Further, because the point light sources are discrete components, the panel frame members can take on a variety of shapes including curved shapes.

An illumination device for simulating neon lighting comprising a plurality of spaced point light sources positioned adjacent a lateral light receiving surface of a substantially rod-like waveguide made of a material that preferentially scatters light entering the light receiving surface such that the light intensity pattern exiting a lateral light emitting surface of the waveguide has a substantially uniform light intensity pattern.

A planar light source device includes: a plurality of point light sources, each of which emits a light; a light guide plate that includes a first surface, and a second surface perpendicular to the first surface, and that is configured to guide the emitted lights incident from the first surface to be emitted from the second surface; a bottom case including a side portion substantially parallel to the first surface; a light source substrate that includes the plurality of point light sources arranged thereon at a predetermined interval, and that is arranged at a side of the first surface; a frame that sandwiches the light source substrate and the side portion of the bottom case and holds the second surface and that includes a plurality of gaps at positions facing the point light source.