Abstract: Provided is a light receiving device includes a ball lens and a light receiver disposed in a condensing region of the ball lens. The light receiver includes a light receiving element array in which light receiving units each of which includes a light receiving element and an amplifier circuit associated with the light receiving element are disposed in an array, and a selection circuit that selects a light receiving unit included in the light receiving element array.

Abstract: Provided is a light receiving device including a ball lens, a concave lens that is arranged in a light collecting region of the ball lens, a reflection element that is arranged in association with the concave lens and has a reflection surface that diffracts and reflects an optical signal collected by the concave lens, and a light receiving element that is arranged in association with the reflection element and receives the optical signal diffracted and reflected by the reflection surface of the reflection element.

Abstract: A transmitter that includes a light source that includes a plurality of emitters, a spatial light modulator that includes a modulation part in which a plurality of modulation regions associated with each of a plurality of the emitters is set, curved mirrors that have a curved reflecting surface having a curvature relevant to a projection angle of projection light transmitted as a spatial light signal and disposed in association with each of a plurality of the modulation regions in such a way that, on the reflecting surface, modulated light modulated in each of a plurality of the modulation regions set in the modulation part of the spatial light modulator is reflected, and a light shielding band that is disposed between the spatial light modulator and the curved mirrors and removes an unnecessary light component included in the modulated light modulated in each of a plurality of the modulation regions.

Abstract: A receiver includes a light receiver including a light-receiving ring including a plurality of light-receiving elements arranged in an annular shape and a light-receiving plate including at least one light-receiving element, a ball lens placed on a ring formed by the light-receiving ring, and a reflector arranged in a gap formed between the light-receiving ring and the light-receiving plate. The plurality of light-receiving elements constituting the light-receiving ring are arranged with a light-receiving surface facing an inner side of the ring formed by the light-receiving ring. The light-receiving element included in the light-receiving plate is disposed inside the ring formed by the light-receiving ring with a light-receiving surface facing the ball lens placed on the light-receiving ring.

Abstract: A receiver includes a ball lens, a light receiving element array including a plurality of light receiving elements arranged around the ball lens, and a light guide including a plurality of reflection units that guide optical signals concentrated by the ball lens toward the light receiving elements. Each of the reflection units includes a first reflector associated with one of the plurality of light receiving elements and having reflecting surfaces formed on inner side surfaces tapered from the ball lens toward the light receiving element, and a second reflector disposed inside the first reflector and formed by combining double-sided mirrors having reflecting surfaces parallel to the reflecting surfaces of the first reflector.

Abstract: A light-receiving device includes: a light guide plate that is a transparent member having, as main surfaces, a first surface and a second surface facing each other and has an emission end formed on at least one end portion of the light guide plate; a wave plate that is disposed on the first surface of the light guide plate and converts an optical signal of circularly polarized light into linearly polarized light; a hologram layer that is disposed on the second surface of the light guide plate and guides a traveling direction of the optical signal converted into the linearly polarized light toward the emission end of the light guide plate; and a light receiver that receives the optical signal emitted from the emission end of the light guide plate and converts the received optical signal into an electrical signal.

Abstract: A light receiving device that includes a lens that collects a spatial light signal, a sensor array including a plurality of light receivers that receives the spatial light signal collected by the lens, and a reception unit that integrates an electric signal derived from the spatial light signal received by each of the plurality of light receivers and selects a light receiver that receives the spatial light signal. according to a voltage value of the integrated electric signal.

Abstract: In order to reliably detect a target object located within a projection area and measure a distance to the detected target object, a distance measurement system includes: a light emitting device including a phase-modulation-type spatial light modulator element, and configured to emit projected light for forming a pattern associated with a phase distribution displayed on a display part of the spatial light modulator element, toward at least two projection areas; a light receiving device for capturing an area including a pattern to be formed by projected light emitted by the light emitting device; and a control device for controlling light emission from the light emitting device, verifying, for each projection area, presence or absence of a target object within the projection area by analyzing imaging data captured by the light receiving device, and measuring a distance to a detected target object.

Abstract: A management system includes a monitoring device and at least one detection device. The monitoring device projects detection light for detecting a monitoring target, and identifies the monitoring target based on a detection pattern of reflected light of the detection light. The detection device is installed on the monitoring target. The detection device receives the detection light projected by the monitoring device, and reflects the detection light at a timing set to the detection device in a predetermined period starting from a timing at which the detection light is received.

Abstract: An information display system includes a frame, a pair of cameras arranged at both side ends of the frame, a transparent display fitted into the frame, a display position setting device that detects a target based on a feature extracted from image data captured by the pair of cameras, and sets, as a display position, a position at which a straight line connecting an eye of a user wearing the frame and the target passes through the transparent display, and a controller that controls the transparent display in such a way as to display a point light at the display position set by the display position setting device.

Abstract: A light transmitting device that includes a light transmitter that transmits a spatial light signal including a communication signal, and a light transmission control unit that adds a dummy signal having a same brightness as a ghost image of the communication signal to the spatial light signal and controls the light transmitter in such a way that the dummy signal is displayed at a position of the ghost image.

Abstract: This communication device has a phase-modulation spatial light modulator; and a control unit which causes, during one frame time interval, the phase-modulation spatial light modulator to operate with first and second operation patterns. In a predetermined period within the one frame time interval, the first operation pattern includes a first light transmittable interval during which first signal light can be output, and a first pause interval during which the first signal light cannot be output whereas the second operation pattern includes a second light transmittable interval during which second signal light can be output, and a second pause interval during which the second signal light cannot be output. The first and second light transmittable intervals are each longer than a half of the predetermined period. The second pause interval is present within the first light transmittable interval, and the first pause interval is present within the second light transmittable interval.

Abstract: A display system includes a plurality of tags and a detection device. Each tag of the plurality of tags stores an identification code for identifying that tag, generates electric power upon receiving light that contains identification information to be compared with the identification code, and emits light using the electric power of that tag when the identification information contained in the received light matches the identification code. The detection device generates image data in accordance with an input of the identification information on a selected article, projects scanning light containing identification information on the position of the tag extracted from the generated image data, and, when emitted light from any of the plurality of tags is detected from the image data acquired during a period in which the scanning light is projected, projects marking light within a range attached with the tag that has emitted light.

Abstract: A light-receiving device includes: a light guide plate that is a transparent member having, as main surfaces, a first surface and a second surface facing each other and has an emission end formed on at least one end portion of the light guide plate; a wave plate that is disposed on the first surface of the light guide plate and converts an optical signal of circularly polarized light into linearly polarized light; a hologram layer that is disposed on the second surface of the light guide plate and guides a traveling direction of the optical signal converted into the linearly polarized light toward the emission end of the light guide plate; and a light receiver that receives the optical signal emitted from the emission end of the light guide plate and converts the received optical signal into an electrical signal.

Abstract: A gas detection that includes a projector including a light source that emits laser light having a wavelength at which an absorption rate by a detection target gas is high and a spatial light modulator that modulates the laser light emitted from the light source, a projection control unit that controls projection light to be projected toward a retroreflector by causing the light source to emit the laser light and setting a pattern of a modulation part of the spatial light modulator, a light receiver that receives reflected light of the projection light reflected by the retroreflector and measures an intensity of the received reflected light; and a leakage determination unit that acquires the intensity of the reflected light from the light receiver and determines leakage of the detection target gas in a detection space with the retroreflector based on the intensity of the reflected light.

Abstract: A light-receiving device includes: a light guide plate of a transparent member having a first surface and a second surface as principal surfaces opposed to each other and an emission surface formed on at least one end of the transparent member; a lens sheet having lenses and is disposed opposite to the first surface; a support member that supports the lens sheet such that a distance between the principal surface of the lens sheet and the second surface is equal to the focal distance of the lenses; a directional light-guide layer that is disposed on the second surface of the light guide plate and guides, toward the emission surface, the travel direction of an optical signal entering the light guide plate; and a receiver that receives the optical signal emitted from the emission surface of the light guide plate and converts the received optical signal into an electric signal.

Abstract: A projection device comprises: a spatial light modulator having a display unit whereon a pattern corresponding to a display image is presented; a light source arranged to irradiate the display unit with emission light; a projection optical system arranged on the optical path of the reflected light of the emission light incident on the display unit and projecting projection light with the high order component included in the reflected light removed therefrom; and a projection control unit that causes the display unit to present a composite image that combines an image formed by a virtual lens that focuses the emission light incident on the display unit at a first focus position with the pattern corresponding to the display image, and controls the light source so that the display unit is irradiated with the emission light.

Abstract: This communication system includes: at least one transmitter which emits signal light; and a receiving device which receives the signal light. The receiving device is provided with: a control unit which generates a phase image on the basis of position information indicating a position of the transmitter, and combines a virtual lens image with the phase image to generate a composite image; a phase-modulation spatial light modulating element which receives the composite image and diffracts and collects signal light; and a detector which receives the diffracted and collected signal light.

Abstract: An information display system includes a frame, a pair of cameras arranged at both side ends of the frame, a transparent display fitted into the frame, a display position setting device that detects a target based on a feature extracted from image data captured by the pair of cameras, and sets, as a display position, a position at which a straight line connecting an eye of a user wearing the frame and the target passes through the transparent display, and a controller that controls the transparent display in such a way as to display a point light at the display position set by the display position setting device.

Abstract: This display system includes: a projection device including a phase-modulation-type spatial light modulator element, a light source radiating light to a display part of the element, and a control circuit controlling the element and the light source; and projecting reflection light of the part of the element; and a reflecting mirror reflecting projection light of the device. The control circuit displays, on the part of the element, a first pattern and a second pattern associated with display information having different definition degrees. The reflecting mirror includes a first reflection region causing reflection light of a portion where the first pattern is displayed to enter, and reflecting the light toward a first display region, and a second reflection region causing reflection light of a portion where the second pattern is displayed to enter, and reflecting the light toward a second display region.