Abstract: A head up display apparatus configured to display a virtual image corresponding to video to a driver by projecting the video onto a windshield of a vehicle, includes: a video display apparatus including an LED light source and a display element, the video display apparatus being configured to form the video on the display element; and a virtual image optical system configured to cause light emitted from the video display apparatus to be reflected by the windshield to display the virtual image in front of the vehicle. The virtual image optical system includes a concave mirror and an optical element, and a freeform surface of the concave mirror is set so that an optical axis of video light traveling from the concave mirror toward the windshield is inclined in a horizontal direction.

Abstract: A solid state light source device includes N (an integer of two or more) sets of solid state light source assemblies having a plurality of solid state light source cells arranged in a matrix pattern a multiple lens block including N incidence faces facing the N sets of solid state light source assemblies and causing light emitted from the solid state light source cells to be incident through multiple lens cells of a matrix pattern and one emission face composing the light incident from the N incidence faces and a dichroic filter that is obliquely arranged on the incidence faces inside the multiple lens block and selectively reflects or transmits incident light based on the incident light wavelength. Light distribution characteristics and color temperature of light exiting the emission face of the multiple lens block are controlled by a ratio of power supplied to the solid state light source cells.

Abstract: A projection video display apparatus includes: a video projection screen, having a front and a rear surface, arranged in an indoor space. The video projection screen transmits video light from behind the rear surface or in front of the front surface to display video on the front surface. The front surface functions as a video display surface. A video projecting apparatus, arranged in a side of the rear surface or the front surface, enlarges and projects the video light from the rear or front surface. The video projecting apparatus is configured by an optical scanning video projecting apparatus that forms the video by scanning video light composed of coherent light on the video projection screen. The video projection screen guides the video light from the video projecting apparatus toward a direction to the front surface, and causes part of the light in the indoor space to be transmitted therethrough.

Abstract: An object of the present invention is to provide a compact head-up display device. The head-up display device of the present invention includes an image forming unit that emits image light containing image information, and an eyepiece optical system that displays a virtual image by reflecting the image light, in which the eyepiece optical system includes a concave lens, a free curved surface lens, and a free curved surface concave mirror disposed in order from the image forming unit side along the emission direction of the image light.

Abstract: A vehicle headlight apparatus, on a vehicle applies illumination light to a road surface, comprises: a light source device to generate the illumination light; and a lens on a light axis of the light source device and projects the illumination light from the light source device to form a desired light distribution, wherein the light source device includes: one or more semiconductor light source elements to emit light; a collimator unit having one or more collimators disposed on a light emission axis of each of the semiconductor light source elements and converts light emitted from a solid light source into substantially parallel light; and a polarization conversion element provided on an emission surface side of the collimator unit and converts incident light into predetermined polarized light, and the illumination light emitted from the polarization conversion element of the light source device is applied in a predetermined direction through the lens.

Abstract: A vehicle headlight device attached to a part of a vehicle and configured to apply illumination light to a road surface on which the vehicle runs comprises: a light source device configured to Generate the illumination light; an optical unit disposed on a light axis of the light source device and configured to project the illumination light from the light source device so as to form a desired light distribution; and a polarization direction conversion device disposed in a part of a light path between the light source device and the optical unit and being able to control the illumination light from the light source device with inclusion of conversion of a polarization direction thereof for each irradiation region in accordance with a state of a position irradiated with the illumination light on the road surface.

Abstract: [Solution] Provided is a water purification agent suitable for use in an automated purification treatment device, when a wastewater purification treatment using a plant-derived water purification agent is performed with the automated purification treatment device. The water purification agent is a granulated product containing a mixture of a plant powder and a polymer coagulant.

Abstract: Provided is an information display apparatus that significantly improves light resistance with respect to sunlight. The information display apparatus, which displays video-image information on a projection surface by a virtual image, includes in a housing partly having an opening: a video-image-light generator that generates video-image light for displaying the video-image information; a video-image-light processor that performs a predetermined optical processing to a video image generated by the video-image-light generator; and a projector that projects, onto the projection surface through the opening of the housing, the video-image light optically processed by the video-image-light processor so that a viewer is capable of virtually recognizing the video-image information as a virtual image in front of the projection surface, wherein a light path in the housing is provided with a suppressor selectively suppressing a P-polarizing component of light in a visible light region.

Abstract: A projection video display apparatus and method for solving a problem of deterioration of visibility of video that is projected on a transparent or semi-transparent screen. In a projection video display method for projecting and displaying video light on a rear surface or front surface of a transparent or semi-transparent video projection screen disposed in a space by a projection video display apparatus, video light to be projected and displayed is generated, the generated video light is projected on the rear surface or front surface of the transparent or semi-transparent video projection screen, and at that time, a video display position recognition screen for making an observer of the video recognize a position where the video is projected is projected on the transparent or semi-transparent video projection screen before start of the projection of the video light or simultaneously with the start of the projection of the video light.

Abstract: Each of a road sign projector and a vehicle lamp operates in an assumed usage temperature of a car, and has reduced power consumption and reduced device cost. A road sign projector displays images onto a plurality of regions of a road surface. The road sign projector includes: shades each configured to shape image projection light into a predetermined shape corresponding to the image for each of the regions; and projection lenses corresponding to the regions. The projection lenses are different from one another in at least a focal length and axial inclination.

Abstract: Provided is a projection lens assembly method in an oblique projection optical system, which enables efficient manufacture even if a size of an image display element to be mounted varies, and a projection type image display apparatus using the projection lens. The projection lens assembly method in the oblique projection optical system for an oblique type projection image display apparatus including a block of a spherical lens and a block of an aspherical lens includes: preparing in advance the block of the spherical lens having a size that adapts to image display elements having different sizes and incorporated in the projection image display apparatus, and the block of a common aspherical lens; and assembling the block of the spherical lens selected in accordance with the sizes of the incorporated image display elements and the block of the common aspherical lens to assemble the projection lens.

Abstract: Provided is a light source apparatus that is small and lightweight, has high light utilization efficiency, and is easily utilizable as a modularized, planar light source. The light source apparatus 10 has a light source unit including a plurality of LED elements 14, a LED collimator 15 including a plurality of collimator elements each arranged on a light-emitting axis of each of the plural LED elements 14, and a light guide 17 disposed on an emission side of the LED collimator 15. The light guide 17 includes an incidence portion 171 having an incidence surface on which light on the light-emitting axis from the LED elements 14 is incident, and an emission portion 173c having an emission surface emitting light, and has a free-form surface shape for realizing predetermined light distribution control on at least one of the incidence surface and the emission surface.

Abstract: A small-sized information display apparatus capable of displaying, as virtual images, different pieces of video image information at different positions in a wide area of a windshield. An embodiment has a virtual image optical system in which a flat display forming video image information is arranged, and that includes a projected member for causing virtual images to be displayed at a plurality of positions ahead of a vehicle by reflecting a video image on the flat display, thereby forming the virtual images at the plurality of positions so as to correspond to a viewpoint position of a driver. The virtual image optical system is arranged so that video image light fluxes for establishing the respective virtual images are separated from and independent of one another between the flat display and a concave mirror, and is configured by arranging different optical elements so as to correspond to the respective light fluxes.

Abstract: A projection video display apparatus includes: a video projection screen, having a front and a rear surface, arranged in an indoor space. The video projection screen transmits video light from behind the rear surface or in front of the front surface to display video on the front surface. The front surface functions as a video display surface. A video projecting apparatus, arranged in a side of the rear surface or the front surface, enlarges and projects the video light from the rear or front surface. The video projecting apparatus is configured by an optical scanning video projecting apparatus that forms the video by scanning video light composed of coherent light on the video projection screen. The video projection screen guides the video light from the video projecting apparatus toward a direction to the front surface, and causes part of the light in the indoor space to be transmitted therethrough.

Abstract: It is an object of the present invention to provide a projection optical system having a minimal optical configuration while ensuring necessary capabilities and a head-up display device having a tilted virtual image plane. The head-up display device according to the present invention includes an image forming unit to emit image light containing image information and an eyepiece optical system to display a virtual image by reflecting the image light. While a virtual image plane is tilted to display a virtual image in a range from a far distance to a near distance, a point on the image forming unit conjugating to a far point on the virtual image plane is optically farther from a light flux entering the image forming unit than a point on the image forming unit conjugating to a near point on the virtual image plane.

Abstract: The present invention provides an optical source apparatus that can be manufactured with a low cost, is small and light in weight, has a high usage efficiency of emitted light, and is modularized to be easily usable as a planar optical source. The optical source apparatus includes at least: a plurality of semiconductor optical source elements configured to generate light; a collimator portion on each light emitting axis of the plurality of semiconductor optical source elements; and a polarization conversion element configured of a plurality of polarization split prisms and a phase plate, and the polarization split prisms and the phase plate are arranged at positions that are symmetric to each other with respect to a center axis of the collimator.

Abstract: A HUD system and light source apparatus can be manufactured with miniaturization at low cost. A head-up display apparatus includes: an image display apparatus generating image light to be projected; an optical system performing predetermined correction to the image light emitted from the image display apparatus; and a concave mirror reflecting the image light corrected by the optical system to project it onto a windshield or combiner. The image display apparatus includes: a solid light source; a collimating optical system converting, into parallel light, the light from the solid light source; a lighting optical system configured by an optical member that polarizes a direction of a light beam generated by the collimating optical system and simultaneously expands a width of the light beam; and a display apparatus, the image display apparatus being configured to be arranged across and opposite the optical system on an optical axis of the concave mirror.

Abstract: The information display apparatus configured to display video information of a virtual image on a reflecting surface of conveyance includes: a display configured to display the video information; and a virtual image optical system configured to display a virtual image at a front of the conveyance by reflecting light emitted from the display by means of the reflecting surface. The virtual image optical system includes a concave mirror and an optical element. The optical element is arranged between the display and the concave mirror, and is configured to correct distortion of the virtual image obtained so as to correspond to a viewpoint position of a driver on a basis of a shape of the concave mirror and a shape of the optical element. The information display apparatus further includes a virtual image double image conversion reducer configured to reduce double image conversion of the virtual image.

Abstract: A compact head-up display device is provided. For that purpose, the head-up display device includes a projection optical system which includes an image forming unit to display image information and an ocular optical system to reflect light emitted from the image forming unit to display a virtual image. In the ocular optical system, a free-form surface lens and a free-form surface concave mirror are arranged in order from the image forming unit. The shape of the free-form surface concave mirror is such that curvature radius RY1 in projection on a vertical cross section of the coordinate system of an eye-box is smaller than curvature radius RX1 in projection on a horizontal cross section.

Abstract: A head-up display device that displays information including a video in a part of a field of view of an operator (407) includes a video display device (420) that is arranged at a position deviated from the field of view of the operator and generates and projects video light for projecting the information and a transparent screen (410) that is arranged in a part of the field of view of the operator, and transmit light from the field of view and reflects projection light from the video display device in a direction of the operator. A solid-state light source device (421) that reflects and mixes light emitted from a plurality of light-emitting cells (40) and emits the light obtained by the mixing in a predetermined direction is used as a light source constituting the video display device.