Abstract: A wavelength conversion element according to an aspect of the present disclosure includes a substrate having a reflection surface, a wavelength converter that has a first surface on which excitation light that belongs to a first wavelength band is incident, a second surface located at a side opposite the first surface, and a third surface that intersects the first or second surface and converts the excitation light in terms of wavelength into fluorescence that belongs to a second wavelength band different from the first wavelength band, a holder that is so provided as to face the first or third surface and holds the wavelength converter in the direction along the direction in which the excitation light is incident and in a direction that intersects the light incident direction, and a fixer that fixes the holder.

Abstract: A wavelength conversion element according to the present disclosure includes a base member having a reflecting surface, a wavelength conversion section having a first surface which excitation light in a first wavelength band enters, and a second surface opposed to the base member, and configured to perform a wavelength conversion on the excitation light into fluorescence in a second wavelength band, a holding section configured to hold the wavelength conversion section to the base member, and an air layer disposed in one of a space surrounded by a first recessed part provided to the base member so as to be opposed to the second surface of the wavelength conversion section and the second surface of the wavelength conversion section, and a space surrounded by a second recessed part provided to the wavelength conversion section so as to be opposed to the reflecting surface of the base member and the reflecting surface of the base member, wherein in the first surface, at least a part of a portion opposed to the r

Abstract: A wavelength conversion element according to an aspect of the present disclosure includes a substrate having a reflection surface, a wavelength converter that has a first surface on which excitation light that belongs to a first wavelength band is incident, a second surface located at a side opposite the first surface, and a third surface that intersects the first or second surface and converts the excitation light in terms of wavelength into fluorescence that belongs to a second wavelength band different from the first wavelength band, a holder that is so provided as to face the first or third surface and holds the wavelength converter in the direction along the direction in which the excitation light is incident and in a direction that intersects the light incident direction, and a fixer that fixes the holder.

Abstract: A wavelength conversion element according to the present disclosure includes a base member having a reflecting surface, a wavelength conversion section having a first surface which excitation light in a first wavelength band enters, and a second surface opposed to the base member, and configured to perform a wavelength conversion on the excitation light into fluorescence in a second wavelength band, a holding section configured to hold the wavelength conversion section to the base member, and an air layer disposed in one of a space surrounded by a first recessed part provided to the base member so as to be opposed to the second surface of the wavelength conversion section and the second surface of the wavelength conversion section, and a space surrounded by a second recessed part provided to the wavelength conversion section so as to be opposed to the reflecting surface of the base member and the reflecting surface of the base member, wherein in the first surface, at least a part of a portion opposed to the r

Abstract: A wavelength conversion element according to an aspect of the invention includes a base having a reflection surface, a wavelength conversion section that has a first surface on which excitation light is incident and a second surface facing away from the first surface and converts the excitation light in terms of wavelength into fluorescence, and a bonding section that bonds the wavelength conversion section to the base. Bonding the wavelength conversion section to the base via the bonding section with the reflection surface and the second surface separate from each other provides an air layer in part of the space between the reflection surface and the second surface, and at least part of a portion of the first surface that is the portion facing the air layer is a light incident area on which the excitation light is incident.

Abstract: A wavelength conversion element according to an aspect of the invention includes a base having a reflection surface, a wavelength conversion section that has a first surface on which excitation light is incident and a second surface facing away from the first surface and converts the excitation light in terms of wavelength into fluorescence, and a bonding section that bonds the wavelength conversion section to the base. Bonding the wavelength conversion section to the base via the bonding section with the reflection surface and the second surface separate from each other provides an air layer in part of the space between the reflection surface and the second surface, and at least part of a portion of the first surface that is the portion facing the air layer is a light incident area on which the excitation light is incident.

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: The disclosure relates to a wavelength conversion element including: a substrate rotatable around an axis of rotation; and a phosphor layer, wherein the substrate includes a first region on the inner circumferential side of the substrate and a second region provided closer to the outer circumferential side than the first region and thinner than the first region, and the phosphor layer is provided in the first region.

Abstract: A diffractive optics element includes a substrate configured of a sapphire substrate and a diffractive optics structure, provided on the substrate, that forms an image when a laser beam is incident thereon. The diffractive optics structure has a diffractive optics portion, and the diffractive optics portion has a base material and a diffractive optics layer disposed on the base material. The thickness of the base material is no greater than 20 ?m.

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 fluorescent light emitting element includes a substrate; a phosphor layer that is provided on the substrate; an adhesive layer that is provided between the substrate and the phosphor layer; and a reflection unit that is provided between the adhesive layer and the substrate or between the adhesive layer and the phosphor layer. The phosphor layer is formed of a sintered body made of a cerium-activated garnet structure phosphor containing 0.05 atm % cerium, and a thickness of the phosphor layer is in a range of 100 ?m to 250 ?m.

Abstract: The invention relates to a wavelength conversion element including: a phosphor layer including a first surface and fluorescence-emitting points dispersed therein; a reflection surface provided on the opposite side of the phosphor layer from the first surface; and a substrate provided on the opposite side of the reflection surface from the phosphor layer. The phosphor layer includes a first region on the first surface side and a second region located between the first region and the reflection surface. A concentration of the fluorescence-emitting points in the second region is higher than a concentration of the fluorescence-emitting points in the first 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 wavelength conversion element includes a phosphor layer that includes phosphors and a binder. The thickness of a phosphor region obtained by multiplying the thickness of the phosphor layer by the volume concentration of the phosphor is equal to or larger than 15 ?m.

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 fluorescent light emitting element includes a substrate; a phosphor layer that is provided on the substrate; an adhesive layer that is provided between the substrate and the phosphor layer; and a reflection unit that is provided between the adhesive layer and the substrate or between the adhesive layer and the phosphor layer. The phosphor layer is formed of a sintered body made of a cerium-activated garnet structure phosphor containing 0.05 atm % cerium, and a thickness of the phosphor layer is in a range of 100 ?m to 250 ?m.

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 diffractive optics element includes a substrate configured of a sapphire substrate and a diffractive optics structure, provided on the substrate, that forms an image when a laser beam is incident thereon. The diffractive optics structure has a diffractive optics portion, and the diffractive optics portion has a base material and a diffractive optics layer disposed on the base material. The thickness of the base material is no greater than 20 ?m.

Abstract: The phosphor wheel (wavelength conversion element) includes: a substrate; a light-emitting element having at least a phosphor layer provided on one surface of the substrate; and a first reflective portion provided in at least a first side face of the phosphor layer to change a propagation direction of the light propagating inside the phosphor layer such that an angle with respect to a normal line of the emission face where the fluorescent light is emitted from the light-emitting element is reduced.

Abstract: A scanning image display system which includes a plurality of scanning image displays each including a light source adapted to emit a laser beam, and a scan unit having a first scan section adapted to scan the laser beam emitted from the light source in a first direction on a projection surface, and a second scan section adapted to scan the laser beam in a second direction substantially perpendicular to the first direction. The first scan sections are resonant scan sections which are faster than the second scan sections in scan speed. The first scan sections are heated with light during the time that an image is formed and a reset period of the second scan sections in order to control resonant frequencies of the first scan sections.