Systems and methods for optical narrowcasting are provided for transmitting various types of content. Optical narrowcasting content indicative of the presence of additional information along with identifying information may be transmitted. The additional information (which may include meaningful amounts of advertising information, media, or any other content) may also be transmitted as optical narrowcasting content. Elements of an optical narrowcasting system may include optical transmitters and optical receivers which can be configured to be operative at distances ranging from, e.g., 400 meters to 1200 meters. Moreover, the elements can be implemented on a miniaturized scale in conjunction with small, user devices such as smartphones, thereby also realizing optical ad-hoc networking, as well as interoperability with other types of data networks. Optically narrowcast content can be used to augment a real-world experience, enhance and/or spawn new forms of social-media and media content.

A head mounted display is used in a state of being mounted on a user's head and includes a convex lens disposed at a position facing the user's cornea when the head mounted display is mounted. An infrared light source emits infrared light toward the convex lens. A camera captures an image including the user's cornea in a subject. A housing houses the convex lens, the infrared light source, and the camera. The convex lens is provided with a plurality of reflection regions that reflects infrared light in an inside of the convex lens. The infrared light source causes a pattern of infrared light to appear on the user's cornea by emitting infrared light to each of the plurality of reflection regions provided in the convex lens.

Interactive sensing in retro-reflective imaging systems may be enabled through auto-alignment of an infrared (IR) illumination region with a floating image region by transmitting IR light, added on or within a display, through the same optical path as the visible floating image light. The IR illumination at the display may be either a flood of light or structured light. In some implementations, stereo vision based imaging techniques may be employed in conjunction with an auto-aligned IR floating image to provide illumination for a stereo imaging system and to provide position sensing for interaction.

An apparatus is provided that includes a near infrared (NIR) light emitting diode (LED) having a predominant axis of NIR light transmission from the NIR LED and a lens that disperses NIR light received from the NIR LED with respect to first and second planes, the lens having an air to lens light entry boundary where light from the NIR LED enters a surface of the lens and a lens to air boundary where the light exits the lens in each of the first and second planes, wherein an intersection formed by the second plane with the surface is a line that is concave on each side of the predominant axis, and wherein a radius of the air to lens light entry boundary of the line successively increases over each span of a predetermined number of degrees progressing outwards along the line from the predominant axis.

The present disclosure relates to an optical gas sensor including at least: an optical wave guide including a first elliptical mirror formed along at least part of a first 3-dimensional ellipsoid and having a first focal point and a second focal point, a second elliptical mirror formed along at least part of a second 3-dimensional ellipsoid and having the first focal point and a third focal point, and a third elliptical mirror formed along at least part of a third 3-dimensional ellipsoid and having the first focal point and a fourth focal point; one or more optical sensors installed at at least one of the first, second, third, and fourth focal points; and one or more light sources installed at at least one of the first, second, third, and fourth focal points where the one or more optical sensors are not installed.

A head mounted display is used in a state of being mounted on a user's head and includes a convex lens disposed at a position facing the user's cornea when the head mounted display is mounted. An infrared light source emits infrared light toward the convex lens. A camera captures an image including the user's cornea in a subject. A housing houses the convex lens, the infrared light source, and the camera. The convex lens is provided with a plurality of reflection regions that reflects infrared light in an inside of the convex lens. The infrared light source causes a pattern of infrared light to appear on the user's cornea by emitting infrared light to each of the plurality of reflection regions provided in the convex lens.

Example embodiments include a lens having an IR-reflective coating that is selectively applied to form a variable infrared (IR) interaction pattern on the lens. The variable IR interaction pattern may vary in the manner it interacts with IR wavelengths, so as to provide a machine-readable code when the lens is illuminated by IR light. Accordingly, variable IR interaction patterns may be used to identify particular lenses. Accordingly, a glasses-style, modular, head-mountable device (HMD) may identify which of a number of different possible lenses are currently attached to the HMD, and update certain processes according to the lens or lenses is or are attached. For example, an HMD may calibrate an eye-tracking process according to the particular lens that is attached.

A switch module of a photoelectric integrated mechanical shaft keyboard, having a casing and a key cap a driving device, a photoelectric switch, a movable optical module and a fixed optical module. The photoelectric switch has a PCB, an SMD IR integrated on the PCB and an SMD PT tube. By pressing down the key cap, the driving device drives the movable optical module to move up and down to control the relative positions of the movable optical module and the fixed optical module. When light emitted by the SMD IR tube is coupled into the SMD PT tube, an optical path is connected, so that the photoelectric switch is turned on and when the light emitted by the SMD IR tube cannot be coupled into the SMD PT tube, the optical path is disconnected, so that the photoelectric switch is turned off.

The present invention relates to a light fixture comprising at least one visible light source emitting visible light, at least one IR light source emitting infrared light in an infrared spectrum, an outer housing in which the at least one visible light source and the at least one IR light source is located, a first projection system configured to collect at least some of the visible light and configured to generate at least one first light beam of the visible light along an optical axis having a first beam characteristic, a second projection system configured to collect at least some of the infrared light and configured to generate at least one second light beam of the IR light along the optical axis, wherein the second projection system is configured such that at least outside the outer housing the second beam characteristic substantially corresponds to the first beam characteristic.

A diverged beam optical transmitter is provided that includes a laser source configured to emit a light beam, and one or more lenses. The diverged beam optical transmitter also includes a diffuser placed between the laser source and the one or more lenses, and configured to increase an intrinsic divergence of the light beam and to fill some portion of the one or more lenses such that the light beam is eye safe after the one or more lenses.