Dai Nippon Printing Co., Ltd.

Kaori Nakatsugawa

Makio Kurashige

Shumpei Nishio

Kazutoshi Ishida

Tomoe Sato

Shogo Kubota

Masanori Umeya

Hiroyuki Honda

A portable lighting device includes: a coherent light source; a shaping optical system that shapes coherent light emitted from the coherent light source; and a diffractive optical element that diffracts the coherent light shaped by the shaping optical system to a surface to be irradiated (IP). The diffractive optical element is rotatably supported. The surface to be irradiated is lighted in a pattern depending on a diffraction pattern of the diffractive optical element.

Portable lighting device and lighting method

An illumination apparatus that illuminates an illumination zone having a first direction and a second direction crossing the first direction is provided with a light source to emit a coherent light beam, and a diffraction optical device to diffract the coherent light beam incident from the light source. The diffraction optical device diffracts the incident coherent light beam so that a width of the illumination zone in the second direction gradually becomes wider along the first direction of the illumination zone from a nearer side to the diffraction optical device.

Illumination apparatus having a coherent light source and diffraction optical device that has a plurality of diffraction zones and widens the width of the illumination zone

Illumination apparatus, hologram device, and vehicle control method

There is provided a screen capable of sufficiently reducing speckles. A screen for displaying an image by being irradiated with a light beam from a projector, is provided with a plurality of particles each including a first part and a second part different in dielectric constant, a particle layer having the plurality of particles, and electrodes which form an electric field for driving the particles of the particle layer by applying a voltage to the particle layer.

Screen, display apparatus, screen use method, particle, particle layer, particle sheet, and light control sheet

An illumination device has a coherent light source, an optical device that diffuses the plurality of coherent light beams and illuminates a predetermined illumination area, and a timing control unit that individually controls incident timing of the plurality of coherent light beams to the optical device or illumination timing of the illumination area, wherein the optical device has a plurality of diffusion regions, the diffusion regions being provided corresponding to the plurality of coherent light beams, the plurality of diffusion regions illuminate the illumination range by diffusion of incident coherent light beams, the plurality of diffusion regions have a plurality of element diffusion regions, the plurality of element diffusion regions illuminate partial regions in the illumination area by diffusion of incident coherent light beams, and at least parts of the partial regions illuminated by the plurality of element diffusion regions are different from one another.

Illumination device

An optical sheet, a screen, and a display apparatus capable of reducing speckles are provided. An optical sheet () includes a particle layer () including a transparent retaining part () having a predetermined thickness and a particle () that is accommodated in a cavity () formed in the retaining part () and includes a first portion () and a second portion () having different dielectric constants. The first portion () includes a transparent first main portion () and a first diffusion component () that diffuses light. The second portion () includes a transparent second main portion () and a second diffusion component () that diffuses light. The first diffusion component () and the second diffusion component () have a diameter d satisfying the following conditional expression (1):0.1 &#x3bc;m&#x2264;d&#x2264;15 &#x3bc;m&#x2003;&#x2003;(1).

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Tokyo, Japan

Kaori Nakatsugawa