Abstract: An illumination device includes: a plurality of light-emitting elements; a collimating optical system; a first multi-lens array including a plurality of first lenses; a second multi-lens array including a plurality of second lenses; and a superimposing lens. The plurality of second lenses are arranged respectively corresponding to the plurality of first lenses. The plurality of first lenses form a plurality of first lens columns. A width, in a first direction, of one second lens of the plurality of second lenses has a distribution in a second direction, where the first direction is a direction in which the plurality of first lens columns are arranged and the second direction is a direction orthogonal to the first direction.

Abstract: A wavelength conversion device in which a wavelength conversion element less easily comes off a substrate. A wavelength conversion device includes a substrate capable of rotating around a rotation axis, a wavelength conversion element provided around the rotation axis on one surface side of the substrate, and a fixing member that fixes the wavelength conversion element to the substrate. The wavelength conversion element includes a first surface opposed to the one surface of the substrate, a second surface on the opposite side of the first surface, and a first side surface section that connects the first surface to the second surface. The fixing member is in contact with the first side surface section in at least a part of the first side surface section when viewed from a direction parallel to the rotation axis.

Abstract: A wavelength conversion device includes a substrate having a first surface and a second surface, a wavelength conversion element provided on the first surface, and a heat sink provided on the second surface separately from the substrate.

Abstract: The invention relates to a wavelength converter including a rotating device, a substrate rotated by the rotating device, a wavelength conversion element provided on a first surface of the substrate, and a heat sink that is provided on a second surface facing away from the first surface and is a member different from the substrate. The heat sink includes a plurality of fins, and the substrate is formed of a light transmissive member.

Abstract: An illuminator includes a light source that emits light containing a predetermined polarized light component, an optical element that transmits the light emitted from the light source, a polarization separation element on which the light having passed through the optical element is incident and which performs polarization separation on the incident light, and a temperature adjuster that adjusts the temperature of the optical element.

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 plurality of light-emitting elements; a collimating optical system; a first multi-lens array including a plurality of first lenses; a second multi-lens array including a plurality of second lenses; and a superimposing lens. The plurality of second lenses are arranged respectively corresponding to the plurality of first lenses. The plurality of first lenses form a plurality of first lens columns. A width, in a first direction, of one second lens of the plurality of second lenses has a distribution in a second direction, where the first direction is a direction in which the plurality of first lens columns are arranged and the second direction is a direction orthogonal to the first direction.

Abstract: The invention relates to a light source device including a solid-state light source, a collimator lens which a light beam emitted from the solid-state light source enters, an afocal optical system which includes a light collecting optical system and a collimating optical system and which the light beam having been transmitted through the collimator lens enters, a lens integrator which the light beam having been transmitted through the afocal optical system enters, a polarization splitting element which the light beam having been transmitted through the lens integrator enters, and a wavelength conversion element which a first polarization component split by the polarization splitting element from the light beam enters. At least one of the light collection optical system and the collimating optical system includes a lens formed of quartz.

Abstract: A rotary cooling device includes a rotating device, a base connected to a cooling target and configured to be rotated by the rotating device, and a heat radiating section disposed in the base and configured to radiate heat transmitted from the cooling target via the base. The heat radiating section includes a plurality of fins extending from a rotation center side of the base to an outer circumference side of the base and arrayed along a rotating direction of the base, a plurality of first grooves formed among the plurality of fins and communicating with an outer region of the heat radiating section when viewed along a rotation axis of the base, and a plurality of second grooves crossing at least one of the plurality of first grooves to divide the plurality of fins into a plurality of fin elements.

Abstract: A wavelength conversion device includes a substrate having a first surface and a second surface, a wavelength conversion element provided on the first surface, and a heat sink SCR provided on the second surface separately from the substrate.

Abstract: A light source unit includes one or more light source rows that include a first light source row including light emitting devices. The light emitting devices of the first light source rows are arranged at non-uniform intervals. An illuminator includes a light source unit for emitting a bundle of light beams, a first fly-eye lens including lenslets, a second fly-eye lens, and a condenser lens. The light source unit includes one or more light source rows each including light emitting devices. The principal rays of first light beams outputted from a first light source row out of the one or more light source rows enter different lenslets out of the lenslets. A positional relationship between a principal ray of each of the first light beams and the optical axis of the lenslet which the principal ray enters is aperiodic over the first light source row.

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 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 light source apparatus includes a light source, an optical element on which light emitted from the light source is incident, and a rotating device that rotates the optical element. The optical element includes a substrate rotated by the rotating device, an optical element layer located on a first surface of the substrate, and a heat dissipater located on the substrate. The heat dissipater has a plurality of fins extending from the side facing the center of rotation of the optical element toward the outer circumference of the optical element and arranged along the rotational direction. Among the plurality of fins, the dimension along the rotational direction between two fins adjacent to each other in the rotational direction is so set as to fall within a predetermined dimension range.

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 wavelength conversion device includes a rotating device and a base member which is rotated by the rotating device. The base member includes a wavelength conversion portion which is disposed in an annular shape on a first surface of the base member, a first region which is located further inside than the wavelength conversion portion, and a second region which is located further outside than the wavelength conversion portion, and is larger in surface area than the first region.

Abstract: The invention relates to a light source device including a solid-state light source, a collimator lens which a light beam emitted from the solid-state light source enters, an afocal optical system which includes a light collecting optical system and a collimating optical system and which the light beam having been transmitted through the collimator lens enters, a lens integrator which the light beam having been transmitted through the afocal optical system enters, a polarization splitting element which the light beam having been transmitted through the lens integrator enters, and a wavelength conversion element which a first polarization component split by the polarization splitting element from the light beam enters. At least one of the light collection optical system and the collimating optical system includes a lens formed of quartz.

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 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: The invention relates to a wavelength converter including a rotating device, a substrate rotated by the rotating device, a wavelength conversion element provided on a first surface of the substrate, and a heat sink that is provided on a second surface facing away from the first surface and is a member different from the substrate. The heat sink includes a plurality of fins, and the substrate is formed of a light transmissive member.