Nec Corporation

Nec Platforms, Ltd.

Nec C Orporation

Satoshi Kyosuna

Fujio Okumura

Hirofumi Tsuda

Koya Takata

Satoshi Komatsu

Go Watanabe

Yoichiro Mizuno

In order to efficiently receive spatial light without using a condensing lens, this light receiving device comprises: a first light guide body that has at least a first light receiving surface and a first light emission end and guides, in an oriented manner, signal light entering from the first light receiving surface to the first light emission end; a second light guide body that has at least a second light receiving surface and a second light emission end, the second light receiving surface being connected to the first light emission end, and that guides, in an oriented manner, signal light entering from the second light receiving surface to the second light emission end; and a light receiver that has a light receiving part connected to the second light emission end and that converts the signal light received by the light receiving part to an electrical signal.

Light receiving device, and light transmitting and receiving device

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.

Communication device, phase modulation spatial light modulating element, and operation control method

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.

Projection device, interface device, and projection method

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.

Receiving device, communication system, receiving method, and composite image generation program

In order to reliably communicate with a communication object even when a relative positional relationship with the communication object cannot be accurately recognized, an inter-mobile-body communication system includes: a control device which performs control of switching between a first mode of transmitting wide-area signal light, and a second mode of transmitting selective signal light toward a communication object in response to response signal light responding to the wide-area signal light transmitted in the first mode, and performs control of selectively receiving the response signal light from the communication object; and a light transmitting/receiving device which transmits the wide-area signal light in the first mode, transmits the selective signal light toward the communication object in the second mode, and selectively receives the response signal light from the communication object, according to control by the control device.

Inter-mobile-body communication system, inter-mobile-body communication method, and program recording medium

In order to enable any user to perform an input operation intuitively and safely in a situation where input operation is required, the control device detects an subject entering a projection range based on the characteristics of subjects included in image data generated by controlling an imaging device, controls a projection device to project projection light on a projection surface so that display information for receiving input is displayed over the projection surface, detects when a pointing body has entered the area above the projection surface based on the image data, identifies the content of an instruction based on the positional relation between the display information displayed over the projection surface and the instructing portion of the pointing body, controls a communication device to transmit the identified instruction content as input information, and controls the projection device not to project the projection light on a projection-prohibited surface.

Information input device and information input method

In order to reduce wire connections and achieve a wireless communication environment securing a sufficient communication band, the present invention provides a communication apparatus that includes a wireless communication means for transmitting and receiving a wireless signal, an optical communication means for transmitting and receiving spatial light as communication light, and a control means for performing signal conversion in a process for converting the wireless signal and the communication light and setting a transmission destination of the wireless signal and the communication light.

Apparatus for conversion between wireless signals and spatial light communication signals

A projection device is provided with at least: a laser light source which emits laser light; a conversion unit which converts the laser light into parallel light; a phase-modulation-type spatial modulation element which phase-modulates the parallel light on the basis of a supplied projection image and delivers phase-modulated light; and a control unit. The control unit includes: a projection image storage unit in which at least one projection image group is stored; a processing unit which, with respect to one projection image acquired from the projection image storage unit in synchronism with an update period, generates a combination of a plurality of diffraction patterns in the update period; and a projection image generation unit which supplies the combination of a plurality of diffraction patterns to the phase-modulation-type spatial modulation element as the supplied projection image.

Projection device, projection image control method, and recording medium having projection image control program recorded thereon

In order to make a ghost image appearing when projection light is projected using a phase-modulating spatial light modulation element difficult to visually recognize, a projection device includes a light source, a light-source driving means, a spatial light modulation element, a modulation element control means, a projection control means, and a projection optical system, wherein the projection control means controls the light-source driving means and the modulation element control means in such a way as to cause a phase distribution of an image including a ghost compensation image and a desired image to be displayed on a display part, the ghost compensation image being an image for which high brightness is set totally and in which a display information portion to be displayed on a projection surface is bright while a ghost image portion that appears in association with the display information is dark.

Growing community of inventors

Tokyo, Japan

Satoshi Kyosuna