Abstract: 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.

Abstract: An illumination device includes: a light diffusion device including element diffusion devices that diffuse incident light; a coherent light source that emits coherent light; a shaping optical system that shapes the coherent light; a scanner that adjusts a traveling direction of the coherent light so as to allow the coherent light to scan the light diffusion device; and a light condensing optical system located on a light path of the coherent light from the shaping optical system up to the light diffusion device. The light condensing optical system condenses the coherent light such that a spot area on the light diffusion device is smaller than the element diffusion device. Each element diffusion device diffuses the coherent light incident thereon so as to illuminate an element illumination area corresponding to the element diffusion device.

Abstract: Provided is a lighting device capable of safely illuminating a region to be illuminated having a first direction while making its edge sharp. A lighting device illuminates a region to be illuminated extending in a first direction and extending in a second direction intersecting with the first direction. The lighting device includes a light source and a diffractive optical element having a first hologram component and a second hologram component both of which diffract light from the light source and direct the light to the region to be illuminated, wherein the diffracted light from the first hologram component illuminates the entire region of the region to be illuminated and the diffracted light from the second hologram component illuminates the entire region of the region to be illuminated.

Abstract: An illumination device includes: a predetermined range illumination section capable of illuminating a predetermined range with illumination light emitted from a mobile object; and an eye direction detection section for detecting the direction of the eyes of a driver of the mobile object and/or the direction of the face of the driver. The predetermined range illumination section controls the distribution of the illumination light or the on/off of the illumination light based on the direction of the eyes of the driver and/or the direction of the face of the driver, detected by the eye direction detection section.

Abstract: An illumination device has a coherent light source that emits coherent light beam, and an optical device that diffuses the coherent light beam, wherein the optical device comprises a first diffusion region that diffuses the coherent light beam to illuminate a first area, and a second diffusion region that diffuses the coherent light beam to display predetermined information in a second area.

Abstract: An optical sheet, a screen, and a display apparatus capable of reducing speckles are provided. An optical sheet (50) includes a particle layer (55) including a transparent retaining part (56) having a predetermined thickness and a particle (60) that is accommodated in a cavity (56a) formed in the retaining part (56) and includes a first portion (61) and a second portion (62) having different dielectric constants. The first portion (61) includes a transparent first main portion (66a) and a first diffusion component (66b) that diffuses light. The second portion (62) includes a transparent second main portion (67a) and a second diffusion component (67b) that diffuses light. The first diffusion component (66b) and the second diffusion component (67b) have a diameter d satisfying the following conditional expression (1): 0.1 ?m?d?15 ?m??(1).

Abstract: Provided is an illumination device capable of illuminating a partial range in an illumination range at higher or lower brightness than the other ranges without the need of a complicated processing configuration. The illumination device includes a coherent light source that emits a coherent beam, an optical element 3 including a plurality of diffusion subelements 15-1 to 15-9 each of which guides the coherent beam incident thereon, such that the coherent beam illuminates a corresponding one of illumination object subregions 19-1 to 19-9, and an optical scan unit that guides the coherent beam emitted from the coherent light source and thereby scans the coherent beam on the plurality of diffusion subelements 15-1 to 15-9. The plurality of diffusion subelements 15-1 to 15-9 include diffusion subelements differing in size.

Abstract: Provided is an illumination device which has a coherent light source that emits a first coherent light beam and a second coherent light beam, an optical device that diffuses the first coherent light beam to illuminate a first illumination zone and diffuses a wave of the second coherent light beam to illuminate a second illumination zone, and a timing control unit that individually controls incidence timing of the first coherent light beam and the second coherent light beam on the optical device or illumination timing of the first illumination zone and the second illumination zone, wherein the optical device includes a first diffusion region on which the first coherent light beam is incident, and a second diffusion region on which the second coherent light beam is incident, the first diffusion region is capable of illuminating the first illumination zone by diffusion of the incident first coherent light beam.

Abstract: 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.

Abstract: An illumination device (10) includes: a light diffusion device (50) including element diffusion devices (55) that diffuse incident light; a coherent light source (15) that emits coherent light; a shaping optical system (20) that shapes the coherent light; a scanner (30) that adjusts a traveling direction of the coherent light so as to allow the coherent light to scan the light diffusion device; and a light condensing optical system located on a light path of the coherent light from the shaping optical system up to the light diffusion device. The light condensing optical system condenses the coherent light such that a spot area on the light diffusion device is smaller than the element diffusion device. Each element diffusion device diffuses the coherent light incident thereon so as to illuminate an element illumination area corresponding to the element diffusion device.

Abstract: The invention enables a desired projection pattern on a surface to be illuminated, and enables a projection position and/or a projection orientation of the projection pattern to be changed. A laser beam is shaped into a parallel light, and an incident surface of a diffraction optical element recording a hologram image is irradiated with the parallel light. A projection pattern of an arrow oriented in a predetermined direction is projected as a hologram reconstructed image on a surface to be illuminated. An optical-element drive unit rotates the diffraction optical element about a rotation axis in a rotation plane orthogonal to an optical axis of a parallel incident light. By means of the rotation, a geometric positional relationship of the diffraction optical element with respect to the surface to be illuminated is changed, whereby an orientation of the arrow projection pattern on the surface can be changed.

Abstract: An illumination device including a light source; a light scanner for changing a light path of light-source light; a light diffusion device having element diffusion devices; and a light-path adjustment device disposed on a light path of the light-source light, the light-path adjustment device having element adjustment devices corresponding to respective element diffusion devices, adjusting a light path of the light-source light. An incident position of the light-source light on the light-path adjustment device varies depending on a light path determined by the light scanner. An incident angle of the light-source light on each element diffusion device varies depending on an incident position on the element adjustment device corresponding to the element diffusion device. An emergent angle from each element diffusion device varies depending on the incident angle on the element diffusion device. Each element diffusion device illuminates an element illumination area corresponding to the element diffusion device.

Abstract: An illumination device is provided, including a coherent light source that emits coherent light beam and an optical device that diffuses the coherent light beam. The optical device includes a first diffusion region that diffuses the coherent light beam to illuminate a first area, and a second diffusion region that diffuses the coherent light beam to display predetermined information in a second area. A timing control unit individually controls a light emission timing at which the coherent light source emits the coherent light so that the coherent light is irradiated to the first diffusion region and the second diffusion region, an incident timing at which the coherent light from the coherent light source is incident on the first diffusion region and the second diffusion region, or an illumination timing at which the coherent light diffused by the optical device illuminates the first area and the second area.

Abstract: To protect observer's eyes while forming a clear illumination pattern on a desired region to be illuminated. An illumination device includes a light source that emits coherent light, a collimating optical system that enlarges and collimates a beam diameter of the coherent light emitted from the light source, and a diffractive optical element that diffracts the coherent light collimated by the collimating optical system into a predetermined diffusion angle space. The diffractive optical element has a plurality of element diffractive optical portions and has a function to illuminate the region to be illuminated defined at a predetermined position and having predetermined size and shape to form the desired illumination pattern. Each of the plurality of element diffractive optical portions has a function to illuminate at least a part of the region to be illuminated, and diffractive characteristics of the element diffractive optical portions are different from each other.

Abstract: A coherent light beam from a light source is scanned by a scanning member and is incident to a light receiving surface of a light diffusing element. The incident light beam is emitted as diffused light, passes through an illumination optical system, and forms a drawing spot on an illumination target surface. When a scan control unit controls scanning of the light beam, an illumination area is formed by the moving drawing spot on the illumination target surface.

Abstract: To provide a display device that makes speckles on a screen difficult to be visually recognized and allows an observer to easily observe an image projected on the screen easily. A display device includes a projector that emits coherent light, a screen that projects the coherent light emitted from the projector, and a first optical system that guides transmitted light or diffused light of the screen to an observing direction of an observer, and allows an observer to observe a real image or a virtual image of an image projected on the screen. The screen includes a plurality of particles including a first portion and a second portion, a particle layer having a plurality of particles, electrodes for applying a voltage to the particle layer to generate an electric field for driving the particles of the particle layer.

Abstract: Provided is an optical sheet which includes a plurality of particles and can sustain a speckle reduction effect over long periods of time, and which is used in a screen that is capable of displaying an image by being irradiated with light, the optical sheet including a particle layer having an insulating liquid, a holding layer, and a plurality of particles held rotatably in the holding layer. The particles include a first portion and a second portion, and are held in the holding layer so that the insulating liquid is present around the particles. The kinetic viscosity at 25° C. of the insulating liquid is 5.5 mm2/s or less.

Abstract: An illumination device includes an optical element including a hologram recording medium capable of diffusing a coherent light beam, the hologram recording medium comprising a plurality of regions, each region diffusing a coherent light beam to an illuminated region corresponding to that region, and an irradiation device configured to irradiate the optical element with the coherent light beam so as to allow the coherent light beam to scan the hologram recording medium. The coherent light beam incident to a position existing in each region of the hologram recording medium is diffused to an entire region of the illuminated region corresponding to the region in order to illuminate the entire region of the illuminated region.

Abstract: A laser beam (L50) is reflected by a light beam scanning device (60) and irradiated onto a hologram recording medium (45). On the hologram recording medium (45), an image (35) of a linear scatter body is recorded as a hologram by using reference light that converges on a scanning origin (B). The light beam scanning device (60) bends the laser beam (L50) at the scanning origin (B) and irradiates the laser beam onto the hologram recording medium (45). At this time, by changing a bending mode of the laser beam with time, an irradiation position of the bent laser beam (L60) on the hologram recording medium (45) is changed with time. Diffracted light (L45) from the hologram recording medium (45) produces a reproduction image (35) of the linear scatter body on a light receiving surface (R) of the stage 210.

Abstract: Provided is an illumination device which has a coherent light source that emits a first coherent light beam and a second coherent light beam, an optical device that diffuses the first coherent light beam to illuminate a first illumination zone and diffuses a wave of the second coherent light beam to illuminate a second illumination zone, and a timing control unit that individually controls incidence timing of the first coherent light beam and the second coherent light beam on the optical device or illumination timing of the first illumination zone and the second illumination zone, wherein the optical device includes a first diffusion region on which the first coherent light beam is incident, and a second diffusion region on which the second coherent light beam is incident, the first diffusion region is capable of illuminating the first illumination zone by diffusion of the incident first coherent light beam.