A light source producing a beam of variable divergence, comprising one or more light-emitting devices arranged on a planar substrate, with each of the light-emitting devices having a Lambertian emission distribution. The light source may further comprise a chamber for mixing light emitted from the one or more light-emitting devices, the chamber itself comprising a base defined by the planar substrate, one or more side walls having a reflective interior surface, and a planar diffusive emission surface defining a ceiling of the chamber. The chamber may have an adjustable height. A reflector extends from the chamber for redirecting light exiting from the chamber to form a light beam, the reflector surrounding and having a focal plane coincident with the ceiling of the chamber. Finally, the light source may comprise a mechanism to control a height of the chamber to thereby variably control a divergence of the light beam.

A theater light projector including a housing, a plurality of light sources, a plurality of lenses, a light exiting output aperture, and a central integrating mask. The light exiting output aperture has a center. The plurality of light sources are arranged around a central axis. The plurality of light sources project light though the light exiting output aperture. The center of the light exiting output aperture is substantially void of projected light projected by the plurality of light sources. The central integrating mask is located in the center of the light exiting aperture and partially intersects a portion of the projected light from each of the plurality of light sources.

A theater light projector including a housing, a plurality of light sources, a plurality of lenses, a light exiting output aperture, and a central integrating mask. The light exiting output aperture has a center. The plurality of light sources are arranged around a central axis. The plurality of light sources project light though the light exiting output aperture. The center of the light exiting output aperture is substantially void of projected light projected by the plurality of light sources. The central integrating mask is located in the center of the light exiting aperture and partially intersects a portion of the projected light from each of the plurality of light sources.

An illumination unit includes: a light source section including a laser light source; an optical-path branching device outputting light incident from the light source section, by branching the light into an outgoing optical path of illumination light and other optical path; a photodetector receiving a light flux that travels on the other optical path; a control section controlling an emitted light quantity in the laser light source, based on a quantity of the light flux received by the photodetector; and a light-quantity-distribution control device disposed between the optical-path branching device and the photodetector on the other optical path, the light-quantity-distribution control device controlling a light quantity distribution in the light flux to be incident upon the photodetector.

A light emitting diode lamp is composed of a light emitting diode, a band-pass filter and a light angle adjuster. The filter has a light cutoff function to cut off a light ray with a specific wavelength. The light angle adjuster allows the light rays emitted from the diode to be incident on the filter at incident angles of less than or equal to a maximum incident angle up to which the filter is capable of exerting the light cutoff function. The light angle adjuster is a reflector. The diode is mounted to a bottom portion. The filter is mounted to an opening. On an imaginary cross section including the optical axis, an angle formed between the optical axis and a straight line is less than or equal to the maximum incident angle, the straight line connects the emission center and an edge of the opening.

This vehicle lamp includes a light source part having a semiconductor-type light source, a second lens disposed in front of the light source and having a second lens part, and a first lens disposed between the light source and the second lens and having a first lens part that converts a light cone of the light source into a cone connecting the second lens part and a basic focal point P of the second lens part, wherein the first lens part is formed such that it radiates the light coming from the light source and entering an incident surface located on the horizontally outer side of the first lens part after converting it into inward light so that the light enters an incident surface located on the horizontally outer side of the second lens part.

A display device includes a substrate, a light source, a reflecting structure, and an optical film set. The light source and the reflecting structure are disposed on the substrate. The reflecting structure has an opening, and the light source is correspondingly disposed in the opening. The optical film set is disposed on the reflecting structure, and at least part of the optical film set overlaps with the light source. The optical film set includes a semi-transmissive film disposed on the reflecting structure, a diffuser film disposed on the semi-transmissive film, and a conversion film disposed on the diffuser film.

A display device includes a substrate, a light source, a reflecting structure, and an optical film set. The light source and the reflecting structure are disposed on the substrate. The reflecting structure has an opening, and the light source is correspondingly disposed in the opening. The optical film set is disposed on the reflecting structure, and at least part of the optical film set overlaps with the light source. The optical film set includes a semi-transmissive film disposed on the reflecting structure, a diffuser film disposed on the semi-transmissive film, and a conversion film disposed on the diffuser film.

A light emission device includes a light source that emits an excitation light beam, a light deflector, a wavelength converter that receives and converts the excitation light beam deflected by the light deflector to wavelength-converted light, and a light concentration section that focuses the excitation light beam on the wavelength converter. The light concentration section includes a first optical system disposed between the light source and the light deflector, and a second optical system disposed between the light deflector and the wavelength converter. In the second optical system, a focal length of an Ay-axis is shorter than a focal length of an Ax-axis, where the Ax-axis is defined as an axis that has a lowest beam parameter product of the excitation light beam, and the Ay-axis is defined as an axis orthogonal to the Ax-axis in a cross section perpendicular to a propagation direction of the excitation light beam.

The invention relates to a lighting device for issuing a light beam in a main direction along an optical axis. The lighting device comprises a light source and a positive, refractive lens provided on the optical axis, the lens being movable with respect to the light source over the optical axis. The lighting device further comprises a mixing structure provided on the optical axis and having an added blurring strength FWHM, with FWHM being in a range of 3 to 15.