Abstract: A transmissive display device includes: a light source which outputs light; a display part which receives the light from the light source and generates display light representing an image; a deflecting element which changes a direction of the display light emitted from the display part; and a transmissive reflector which reflects, towards a user, light of a wavelength included in the display light emitted from the display part, and transmits light of other wavelengths. An angle formed by a straight line, which extends between an upper edge of an incident area of the display light on the transmissive reflector and a lower portion of an eyebox which is defined as a visible range of the reflected light from the transmissive reflector, with respect to a horizontal line is smaller than a difference between an emission angle and an incident angle of the display light at the transmissive reflector.

Abstract: A display apparatus, includes: a display light emission unit which includes a light source, forms an image, and emits display light corresponding to formed image; a deflection unit which deflects the display light; a narrow band reflection unit which has characteristics of reflecting only light in a reflected wavelength range and transmitting light of wavelengths other than the reflected wavelength range, and reflects the display light incident from the deflection unit towards a viewpoint; and a control unit which changes an incidence angle at which the display light is incident on the narrow band reflection unit, in accordance with change in a wavelength of the light, wherein the narrow band reflection unit is configured such that the reflected wavelength range changes when an incidence angle of light changes, and the control unit changes the incidence angle such that a wavelength of the light is included within the reflected wavelength range.

Abstract: Provided are a laser backside irradiation device and a liquid crystal display device reducing a thickness of the respective device and improving a contrast while making a luminance distribution substantially uniform. The laser backside irradiation device includes a laser light source, a splitting optical system splitting laser light emitted from the laser light source into a plurality of laser beams, and a plurality of illumination optical systems illuminating a liquid crystal panel for two-dimensionally modulating a light intensity from a backside thereof, wherein the illumination optical systems expand the laser beams split by the splitting optical system to illuminate divided regions on the liquid crystal panel, respectively.

Abstract: A liquid crystal display device includes a reflective color filter arranged to intersect with an optical path of light emerging from a principal surface of a light guide plate, and a recycle portion arranged at a side of the light guide plate opposite to the reflective color filter. Out of light incident on the light guide plate, light reflected by the reflective color filter is returned to the reflected color filter again by being reflected by the recycle portion via the light guide plate.

Abstract: A surface illumination apparatus has: a plurality of light sources (12a, 12b) which emit lights; a light guiding plate (15) which allows the lights emitted from the light sources to enter through one of the side faces and emits the lights through one principal plane; a polarizing filter (19) which transmits lights in a predetermined polarizing direction and reflects lights in a polarizing direction perpendicular to the predetermined polarizing direction; a polarizing modulation plate (18) which performs predetermined modulation on the polarizing characteristics of the incident lights; and a reflection sheet (17) which regularly reflects the incident light.

Abstract: A laser illuminating device and an image display device are provided to enable a removal of speckle noises in a diffraction field and an image field, to uniformly illuminate an illumination plane, and to realize miniaturization. The laser illuminating device 100 includes a laser light source 3 and a first lens 1 including a plurality of microlenses 10, each having a predetermined numerical aperture in an in-plane direction, and each of the microlenses 10 being adapted to expand laser light emitted from the laser light source 3 to thereby superimpose the laser light transmitted through each of the microlenses 10. The laser illuminating device 100 also includes a second lens 2 having an effective diameter larger than an effective diameter of the first lens 1, and compensating for a divergence angle of the laser light expanded by each of the plurality of the microlenses 10.

Abstract: A planar illumination device 10 is provided with a laser light source 11 for emitting laser light, a light source side bundle fiber 12 having one end surface thereof optically connected with the laser light source 11, a flat light guide plate 13, a plurality of connection side fibers 16 planarly arranged in parallel with each other at a side surface of the light guide plate 13, and a light guiding fiber 14 for guiding the laser light from the light source side bundle fiber 12 to the plurality of connection side fibers 16. The laser light is incident on the side surface of the light guide plate 13 from the plurality of connection side fibers 16 via a plurality of fiber collimators 17 and output light is uniformly emitted from one principal surface of the light guide plate 13.

Abstract: A see-through display including a light source for emitting light, a projection optical system for projecting the light emitted by the light source, and a volume hologram for deflecting the light projected by the projection optical system. The volume hologram has a linear expansion coefficient of ? (/° C.) and interference fringes recorded with recording light having a wavelength of ? (nm). The wavelength of the light emitted by the light source has a temperature dependency of K (nm/° C.), and the wavelength ? (nm) and the temperature dependency K (nm/° C.) satisfy the relationship of 0?K/??2?.

Abstract: An image display device includes a laser source for emitting a laser beam, an image forming element which uses the laser beam to emit image light for displaying an image, a first diffraction element for diffracting the image light, and a controller for controlling a display position of the image on the basis of a wavelength of the laser beam and a temperature of the first diffraction element.

Abstract: A laser light source (1) emits a beam. A collimator lens (2) converts the beam emitted from the laser light source (1) into first substantially parallel light. A lenticular lens (3) expands a beam of the first substantially parallel light converted by the collimator lens (2) into a linear shape in a first direction. A Fresnel lens (4) converts the beam expanded in the first direction by the lenticular lens (3) into second substantially parallel light. A free curved surface mirror (5) has a reflecting surface formed into a free curved surface, and expands a beam of the second substantially parallel light converted by the Fresnel lens (4) into a planar shape in a second direction orthogonal to the first direction. This arrangement enables to provide a planar illumination device with a small thickness and high light use efficiency.

Abstract: Upon obtaining green light as wavelength converted light by causing infrared light to be incident on a wavelength conversion element, the absorption of the green light occurs due to the generation of ultraviolet light as sum-frequency light of the infrared light and the green light in the wavelength conversion element and the destruction of a crystal composing the wavelength conversion element occurs due to heat generated at this time. In a laser wavelength converter of the present invention, a condensed position of the infrared light in the wavelength conversion element is deviated from a position assumed to be optimal when the influence of the generated heat is ignored. Consequently, crystal destruction is suppressed, a high-efficiency wavelength conversion is enabled and high-output wavelength converted light exceeding several watts, which was difficult to attain in conventional wavelength conversion elements, is attained.

Abstract: A wavelength conversion laser light source includes: an element temperature switching section that switches a temperature of the wavelength conversion element according to a harmonic wave output value as set in an output setting device, and the element temperature switching section for switching a temperature of a wavelength conversion element according to a harmonic wave output level as set in the output setting device, wherein the element temperature switch section includes an element temperature holding section that holds the wavelength conversion element at the temperature as switched by the element temperature switching section.

Abstract: A display device is provided with an image display portion for temporally switching a left frame image to be viewed by a left eye, and a right frame image to be viewed by a right eye to emit video light so that a video is stereoscopically perceived; a light deflector for deflecting the video light emitted from the image display portion; and a controller for controlling the light deflector to adjust a deflection direction of the video light output from the light deflector. The image display portion changes polarization characteristics of the video light area by area, and the light deflector deflects the video light in response to the polarization characteristics so that the video light of the left frame image is incident to the left eye and the video light of the right frame image is incident to the right eye.

Abstract: A surface illumination device is provided with a laser light source capable of emitting a laser light, an incident surface on which the laser light is incident, a light guiding plate having a principal surface from which the laser light emerges as a surface emergent light, and an irradiating member capable of irradiating the laser light from the laser light source over a specified range extending in the longitudinal direction of the light guiding plate.

Abstract: A wavelength conversion laser device includes a laser light source which emits a laser beam, two reflective surfaces which reflect therefrom a laser beam, a wavelength converter provided between the two reflective surfaces, which converts a laser beam into a wavelength-converted laser beam, and condensing optics which condense the laser beams to be injected between the two reflective surfaces, wherein at least one of the two reflective surfaces has a curvature for reflecting a laser beam to be re-injected into the wavelength converter between the two reflective surfaces repeatedly while forming multi paths of laser beams injected into the wavelength converter at different incident angles, and the condensing optics are arranged to disperse beam waists of the laser beams in the wavelength converter, which reciprocate between the two reflective surfaces.

Abstract: A wavelength conversion laser light source includes: an element temperature switching section that switches a temperature of the wavelength conversion element according to a harmonic wave output value as set in an output setting device, and the element temperature switching section for switching a temperature of a wavelength conversion element according to a harmonic wave output level as set in the output setting device, wherein the element temperature switch section includes an element temperature holding section that holds the wavelength conversion element at the temperature as switched by the element temperature switching section.

Abstract: An LCD backlight (10) has a light source (12) that emits a laser light, a lens (21), a mirror (13), a rotary polygon mirror (14), a scanning lens (15) and a return mirror (16) constituting a transforming optical system that transforms the laser light from the light source (12) to a linear light, and a light guiding plate (17) that allows the linear light to enter and emits two-dimensional light in the horizontal direction. An emission end face (19) of the light source (12) is disposed in a rear face side of the light guiding plate (17) so that a surface normal line thereof is in the horizontal direction or is inclined downward from the horizontal direction, and the lens (21), mirror (13) and scanning lens (15) are disposed in the rear face side of the light guiding plate (17), so that surface normal lines of the light transmission surface and light reflection surface thereof are all in the horizontal direction or are inclined downward from the horizontal direction.

Abstract: A wavelength conversion laser is provided with a pair of fundamental wave reflecting surfaces for reflecting a fundamental wave to define a plurality of fundamental wave paths passing a wavelength conversion element at different angles, and a control unit for controlling wavelength conversion efficiencies so that the wavelength conversion efficiency on a specific one of the plurality of fundamental wave paths extending in different directions between the pair of fundamental wave reflecting surfaces is highest.

Abstract: A wavelength conversion laser device includes a laser light source which emits a laser beam, two reflective surfaces which reflect therefrom a laser beam, a wavelength converter provided between the two reflective surfaces, which converts a laser beam into a wavelength-converted laser beam, and condensing optics which condense the laser beams to be injected between the two reflective surfaces, wherein at least one of the two reflective surfaces has a curvature for reflecting a laser beam to be re-injected into the wavelength converter between the two reflective surfaces repeatedly while forming multi paths of laser beams injected into the wavelength converter at different incident angles, and the condensing optics are arranged to disperse beam waists of the laser beams in the wavelength converter, which reciprocate between the two reflective surfaces.

Abstract: A guiding device includes: a laser light source that emits a laser beam; and a linear guiding portion that propagates the laser beam and is extended in the guiding direction on a road surface on which a mobile body moves. The linear guiding portion is provided with a function of radiating the laser beam in the guiding direction from the surface where linear guiding portion extends, while propagating the laser beam, and guiding the mobile body by light.