A optical apparatus to display an image to a user is disclosed. The apparatus comprises an image source to generate an image bearing light beam having a first numerical aperture; and a diffuser screen. The diffuser screen is configured to increase the numerical aperture of the image bearing light beam to a second numerical aperture. The diffuser screen comprises a first part comprising: a first face and second face substantially parallel to each other, a first array of a plurality of waveguides forming an optical path between the first face and the second face. A value of an optical property of each of the plurality of waveguides is selected randomly from a set of values of the optical property. The first array of a plurality of waveguides is arranged such that each of the plurality of waveguides has an optical axis that is substantially parallel to it's nearest neighbour. Substantially all the waveguides of the first array are sized below a size that would allow a single mode of visible light to propagate along each waveguide

An optical computing device includes: a light-diffraction element group including planar light-diffraction elements made of a photo-curable resin; and a tubular body that houses the light-diffraction element group and that has an inner surface to which at least a part of a perimeter of each of the planar light-diffraction elements is fixed.

A lens and an optical system device are provided which can measure optical characteristics of a light source or an optical element with a simple structure. A lens 1 has an optical axis, and includes an incident surface F and an emit surface B. The incident surface F and the emit surface B are formed so as to emit incident light to the incident surface F from a first position O at an irradiation angle θ relative to the optical axis from the emit surface B at an emit angle θ/m (where m>1) relative to the optical axis by refraction at the incident surface F and at the emit surface B, and formed in such a way that apparent positions of lights emitted from the emit surface B all begin from a second position P. Moreover, an optical system device includes the lens 1 and a diffuser panel that diffuses emitted light from the lens 1.

An optical film, comprising a substrate, wherein a first plurality of multi-faceted recesses are formed on the substrate, wherein the plurality of multi-faceted recesses are capable of scattering lights that enter into a second surface of the substrate, said first surface and said second surface are two opposite surfaces of the substrate.

A headlamp with frontal lamps and rear signaling is presented. The headlamp uses part of the light produced in the front lamp to achieve rear and/or lateral lighting and signaling. The headlamp has a housing which includes a light module, a light source and a holding strip for allowing the housing to be fixed to the head of a user. Tthe light module contains a module for connecting one or more optical fiber(s). The holding strip contains one or more optical fiber(s) having first and second ends. The first end is coupled to the connection module. The second end is coupled to at least one optical diffuser. A method of providing a headlamp with frontal lamps and rear signaling is also presented.

A rectangular wide-beam flashlight that utilizes a plurality of LEDs positioned in specifically formed optical elements to generate a uniform, rectangular beam pattern configured to substantially illuminate one or more walls in a room. The flashlight uses a radial array of LEDs that are disposed at or within optical elements or cavities configured to combine the output of the LEDs to form a substantially uniform and seamless, high-aspect ratio or wide rectangular beam for adequately illuminating one or more walls in a room.

A light beam emission system includes: a blower that forms a flow path in which aerosol flows; and an emitter that emits a light beam. At least part of the light beam propagates along the flow path of the aerosol.

A light projecting apparatus is disclosed. The apparatus has a head with first and second light sources. There is a first reflector and a second reflector respectively disposed proximate to the first and second light sources. Each of the first and second reflectors has a concave reflective surface and a convex reflective surface configured to form light emitted by the respective light source into an illumination pattern having a central region having a substantially uniform distribution of luminous intensity and a taper region having a tapered luminous intensity.

The present invention relates to a head up display system, in particular for a motor vehicle, comprising: a picture generating unit having a picture projection optics, a tilted mirror and an intermediate image plane, wherein light from the picture projection optics is deflected by the mirror toward the backside of the intermediate image plane, and an optical lens and/or mirror arrangement for magnifying and/or conveying a picture generated on the intermediate image plane to an optical combiner, wherein a pair of prisms is inserted in the optical path between the tilted mirror and the intermediate image plane to eliminate or mitigate specific light beams emanating from the intermediate image plane and traveling toward the tilted mirror and/or specific light beams emanating from the intermediate image plane already being reflected from the tilted mirror and traveling back toward the intermediate image plane.

Accessory lens structures for cameras are described. For example, an image capture device may include a mother lens assembly including a first stack of lenses; an image sensor positioned at a first end of the mother lens assembly and configured to detect images based on light incident on the image sensor through the first stack of lenses; a conversion lens assembly including a second stack of lenses, wherein the second stack of lenses is afocal; and a conversion lens mounting apparatus configured to removably attach the conversion lens assembly to the image capture device in a position over a second end of the mother lens assembly, opposite from the image sensor, such that light incident on an outer lens of the second stack of lenses will be refracted through the second stack of lenses and the first stack of lenses to the image sensor.