Abstract: A wavelength conversion device includes a wavelength conversion element, and a cooling device adapted to cool the wavelength conversion element. The cooling device has a first blower device, and the wavelength conversion element is disposed on an intake side of the first blower device.

Abstract: A projector includes a light source device, a diffraction element that converts light from the light source device into 0-th order light and diffracted light, a light modulation device that modulates the diffracted light so as to form image light, and a projection optical system that emits projected light having a chief ray which is tilted with respect to an optical axis of the image light incident from the light modulation device. Defining a reference plane as a plane which is perpendicular to a plane including the optical axis and a chief ray of the projected light and includes the optical axis, a plane including an optical axis of the 0-th order light and a chief ray of the diffracted light intersects the reference plane.

Abstract: A light source apparatus includes a light source, a substrate provided rotatably around a predetermined axis of rotation, a scattered light generator which is provided on the substrate and on which light from the light source is incident, a pickup lens provided on the light exiting side of the scattered light generator, and a holding member that holds the pickup lens, and at least one of the contour of a surface closest to the substrate among the surfaces of the holding member and the contour of a surface facing the substrate among the surfaces of the pickup lens is located inside the contour of the substrate when viewed in the direction parallel to the axis of rotation.

Abstract: A projector capable of reliably reducing speckle noise includes a light modulation element which modulates laser light, and a projection optical system on which light emitted from the light modulation element is incident. When the center coordinates of an illumination distribution of laser light in an exit pupil of the projection optical system are x=0 and y=0, normalized illumination at each coordinate is P(x,y), and a calculation range of integration is r (mm), the value of EP determined from a specific numerical expression is set in a range according to the color of laser light.

Abstract: An illumination device includes a light source device which has a plurality of light emission regions including a first light emission region and a second light emission region, and is able to adjust the amount of light emitted from each of the plurality of light emission regions, a light source control device which controls the light source device such that, in a first period, the amount of light emitted from the first light emission region is different from the amount of light emitted from other light emission regions among the plurality of light emission regions, and in a second period, the amount of light emitted from the second light emission region is different from the amount of light emitted from the second light emission region in the first period, and an illumination optical system which superimposes light from the plurality of light emission regions in an illumination region.

Abstract: A projector includes a light source unit, a light modulator that modulates light exited from the light source unit, a polarizer or a wave plate provided on the light modulator, a cooling unit that supplies cooling air to the light modulator, and a turbulent flow plate disposed between the light modulator and the polarizer or the wave plate in a path along which the cooling air from the cooling unit flows toward the light modulator, the turbulent flow plate having a fin that tapers from a base end toward a tip.

Abstract: A light source apparatus includes a light source unit, a light diffusion element that is provided so as to be rotated about a predetermined rotation shaft and includes a plurality of diffusion regions which are consecutively formed around the rotation shaft, and a motor that rotates the light diffusion element so that a region on which light from the light source unit is incident in the light diffusion element is moved between the plurality of diffusion regions. The plurality of diffusion regions include a first diffusion region, and a second diffusion region which has diffusion characteristics different from diffusion characteristics of the first diffusion region and is provided so as to be adjacent to the first diffusion region.

Abstract: A wavelength conversion element includes a substrate, a reflecting section disposed on one surface side of the substrate, a wavelength conversion layer disposed on an opposite side of the reflecting section to the substrate, and emitting fluorescence in response to irradiation with excitation light, and a reflecting surface disposed between a surface of the wavelength conversion layer on an opposite side to the reflecting section and the reflecting section, and adapted to totally reflect light having been input at an angle no smaller than a critical angle out of the fluorescence.

Abstract: A projector includes: a spatial light modulator provided for each color light flux and configured to modulate the light flux in accordance with an image signal; a light combining system configured to combine the color light flux outputted from the spatial light modulator; a projection system configured to project the light combined by the light combining system; a fixing member configured to integrally fix the spatial light modulator, the light combining system, and the projection system; a base on which the spatial light modulators and the light combining system fixed to the fixing member are mounted; and a cover member configured to cover the spatial light modulator and the light combining system mounted on the base, wherein the base and the cover member form a cooling duct through which cooling air for sequentially cooling the spatial light modulator for the respective color light flux flows.

Abstract: A wavelength conversion element includes a disk, a wavelength conversion layer disposed above a first surface of the disk, and a reflecting layer disposed between the disk and the wavelength conversion layer, and Formula 1 is fulfilled. ?d?w(r0)/dr<d?s(r0)/dr??(Formula 1) where, assuming that a circular polar coordinate system having the rotational center as an origin is set on a plane parallel to the first surface of the disk, r: moving radius in the circular polar coordinate system, r0: radius of the disk, ?s(r): thermal resistance of thermal paths passing through inside and a surface of the disk between a point with the moving radius r on the first surface of the disk and an entire surface of the disk, and ?w(r): thermal resistance of the wavelength conversion layer in a thickness direction of the wavelength conversion layer at the moving radius r.

Abstract: A wavelength conversion element includes a substrate, and a fluorescent material layer disposed on the substrate. The volume concentration of the fluorescent material in the fluorescent material layer is equal to or higher than 15 vol %.

Abstract: A projector includes an illumination device adapted to emit a plurality of light beams, which includes a first light beam and a second light beam, as illumination light, a liquid crystal light valve, and a projection optical system adapted to project image light, which is emitted from the liquid crystal light valve, on a screen. The image light is formed of a plurality of diffracted light beams and a plurality of zero-order light beams, which are generated by the illumination light and the liquid crystal light valve. In the exit pupil, an illuminance peak due to the zero-order light beam corresponding to the first light beam is disposed at a position different from a position of an illuminance peak due to the diffracted light beam corresponding to the second light beam.

Abstract: A projector includes a light source unit, a light modulator that modulates light exited from the light source unit, a polarizer or a wave plate provided on the light modulator, a cooling unit that supplies cooling air to the light modulator, and a turbulent flow plate disposed between the light modulator and the polarizer or the wave plate in a path along which the cooling air from the cooling unit flows toward the light modulator, the turbulent flow plate having a fin that tapers from a base end toward a tip.

Abstract: An optical device includes: a light modulation unit configured to modulate a light according to image information, including an element substrate having a pixel electrode and a switching element connected with the pixel electrode, and an opposed substrate disposed opposed to the element substrate; a frame configured to hold the light modulation unit; and an incident side dustproof glass disposed in close contact with a light incident side end surface of the opposed substrate, the incident side dustproof glass having the plane size larger than the plane size of the opposed substrate is disposed on the light incident side of the frame.

Abstract: A projector includes a light source unit, a light modulator that modulates light exited from the light source unit, a polarizer or a wave plate provided on a light incident side of the light modulator, a cooling unit that supplies cooling air to the light incident side of the light modulator, and a turbulent flow plate disposed between the light modulator and the polarizer or the wave plate in a path along which the cooling air from the cooling unit flows toward a light incident surface of the light modulator, the turbulent flow plate having a fin that tapers from a base end toward a tip.

Abstract: A projector includes a light source device, a diffraction element that converts light from the light source device into 0-th order light and diffracted light, a light modulation device that modulates the diffracted light so as to form image light, and a projection optical system that emits projected light having a chief ray which is tilted with respect to an optical axis of the image light incident from the light modulation device. Defining a reference plane as a plane which is perpendicular to a plane including the optical axis and a chief ray of the projected light and includes the optical axis, a plane including an optical axis of the 0-th order light and a chief ray of the diffracted light intersects the reference plane.

Abstract: An optical element includes: a first glass substrate; a second glass substrate; a diffractive element disposed on the first glass substrate and made of a resin; a spacer disposed between the first glass substrate and the second glass substrate and regulating a gap between the first glass substrate and the second glass substrate; and a void disposed between the second glass substrate and the diffractive element.

Abstract: A light source apparatus includes a light source unit, a light diffusion element that is provided so as to be rotated about a predetermined rotation shaft and includes a plurality of diffusion regions which are consecutively formed around the rotation shaft, and a motor that rotates the light diffusion element so that a region on which light from the light source unit is incident in the light diffusion element is moved between the plurality of diffusion regions. The plurality of diffusion regions include a first diffusion region, and a second diffusion region which has diffusion characteristics different from diffusion characteristics of the first diffusion region and is provided so as to be adjacent to the first diffusion region.

Abstract: An illumination device includes a light source device which has a plurality of light emission regions including a first light emission region and a second light emission region, and is able to adjust the amount of light emitted from each of the plurality of light emission regions, a light source control device which controls the light source device such that, in a first period, the amount of light emitted from the first light emission region is different from the amount of light emitted from other light emission regions among the plurality of light emission regions, and in a second period, the amount of light emitted from the second light emission region is different from the amount of light emitted from the second light emission region in the first period, and an illumination optical system which superimposes light from the plurality of light emission regions in an illumination region.

Abstract: A projector includes a plurality of light modulation devices and a cooling device. The cooling device includes a cooling fan configured to introduce and discharge air, and a duct configured to guide air received from the cooling fan toward the plural light modulation devices. The duct includes a first duct portion configured to allow the air to flow through the light modulation devices from sides of the light modulation devices, and a second duct portion which communicates with the first duct portion and guides a part of the air flowing through the first duct portion toward devices other than the light modulation devices.