Abstract: A wavelength converter to which the invention is applied includes a phosphor that converts the wavelength of blue light to emit fluorescence, a rotating mechanism that rotates the phosphor around an axis of rotation that extends in a light incident direction in which the blue light is incident, and a heat insulating member that is provided between the phosphor and the rotating mechanism in the light incident direction. The phosphor has a coinciding section that coincides with the rotating mechanism when viewed in the light incident direction.

Abstract: A light source apparatus according to an aspect of the present disclosure includes a substrate having a first surface, a frame, a lid with which the frame is provided, a light emitter that is accommodated in an accommodation space, a wavelength converter that is provided at the substrate, is accommodated in the accommodation space, converts first light emitted from the light emitter into second light having a wavelength different from the wavelength of the first light, and outputs the second light, and a first optical film that is provided in the light path between the light emitter and the wavelength converter, transmits one of the first light and the second light, and reflects the other one of the first light and the second light, and the light emitter emits the first light in such a way that the chief ray of the first light travels along the first surface.

Abstract: A wavelength conversion element includes a wavelength conversion layer having a first surface which excitation light enters, and a second surface opposed to the first surface, and adapted to perform wavelength conversion on the excitation light, a substrate disposed so as to be opposed to the second surface, and a bonding layer adapted to bond the wavelength conversion layer and the substrate to each other, and the bonding layer has a first bonding material disposed in a first region opposed to an incident area of the excitation light in the second surface, and a second bonding material disposed in at least a second region located on an outer periphery of the first region and lower in Young's modulus than the first bonding material.

Abstract: A light source device according to the present disclosure includes a substrate having a first surface, a plurality of light emitting elements disposed on the first surface side of the substrate, a frame body which is disposed so as to surround the plurality of light emitting elements, and which is bonded on the first surface side of the substrate, and a lid body which has a light transmissive member configured to transmit light emitted from the plurality of light emitting elements, which is disposed so as to be opposed to the first surface of the substrate, and which is bonded on an opposite side of the frame body to the substrate. The plurality of light emitting elements is housed in a housing space, the housing space being formed by the substrate, the frame body and the lid body, and the light transmissive member is formed of a material including resin.

Abstract: A light source device according to the present disclosure includes a substrate having a first surface, a plurality of light emitting elements disposed on the first surface side of the substrate, a frame body which is disposed so as to surround the plurality of light emitting elements, and which is bonded on the first surface side of the substrate, and a lid body which has a light transmissive member, which is disposed so as to be opposed to the first surface of the substrate, and which is bonded on an opposite side of the frame body to the substrate. At least one of a first bonding section with which the substrate and the frame body are bonded to each other, and a second bonding section with which the frame body and the lid body are bonded to each other includes an organic adhesive.

Abstract: A light source device according to the present disclosure includes a substrate having a first surface, a plurality of light emitting elements disposed on the first surface side of the substrate, a frame body which is disposed so as to surround the plurality of light emitting elements, and which is bonded on the first surface side of the substrate, and a lid body which has a light transmissive member configured to transmit light emitted from the plurality of light emitting elements, which is disposed so as to be opposed to the first surface of the substrate, and which is bonded on an opposite side of the frame body to the substrate. The plurality of light emitting elements is housed in a housing space, the housing space being formed by the substrate, the frame body and the lid body. The frame body is formed of a material including a nonconductive material.

Abstract: A light source device according to the present disclosure includes a substrate having a first surface, a plurality of light emitting elements disposed on the first surface side of the substrate, a frame body which is disposed so as to surround the plurality of light emitting elements, and which is bonded on the first surface side of the substrate, and a lid body which has a light transmissive member configured to transmit light emitted from the plurality of light emitting elements, which is disposed so as to be opposed to the first surface of the substrate, and which is bonded on an opposite side of the frame body to the substrate. The plurality of light emitting elements is housed in a housing space, the housing space being formed by the substrate, the frame body and the lid body. The frame body is formed of a material including resin.

Abstract: A wavelength conversion element according to an aspect of the invention includes a first wavelength conversion layer that has a first light incident surface on which excitation light is incident and a first light exiting surface facing away from the first light incident surface and emits first fluorescence, a second wavelength conversion layer that has a second light incident surface on which at least the first fluorescence is incident and emits second fluorescence, and a substrate that has a first surface and a second surface facing away from the first surface and includes a light transmitting portion that transmits at least the first fluorescence. The first wavelength conversion layer is so provided that the first light exiting surface faces the first surface of the substrate, and the second wavelength conversion layer is so provided that the second light incident surface faces the second surface of the substrate.

Abstract: A wavelength converter to which the invention is applied includes a phosphor that converts the wavelength of blue light to emit fluorescence, a rotating mechanism that rotates the phosphor around an axis of rotation that extends in a light incident direction in which the blue light is incident, and a heat insulating member that is provided between the phosphor and the rotating mechanism in the light incident direction. The phosphor has a coinciding section that coincides with the rotating mechanism when viewed in the light incident direction.

Abstract: A method for producing an electrical contact includes a step of preparing an electrical contact material including a layer that contains a carbon material on a base material that contains a metallic material having resistivity of 1.59×10?8 ?m to 9.00×10?7 ?m; and a step of processing the electrical contact material obtained to produce an electrical contact, wherein the carbon material is a graphene monolayer or a graphene laminate in which a plurality of the graphene monolayers is laminated, the step of preparing an electrical contact material includes a step of laminating a carbon material layer in which the layer that contains the carbon material is laminated on the base material by microwave surface-wave plasma CVD method or thermal CVD method, and the step of laminating a carbon material layer includes supplying a mixed gas including a source gas that contains carbon and hydrogen gas.

Abstract: A light source apparatus according to an aspect of the invention includes a light source array including a plurality of first light emitting devices and a plurality of second light emitting devices and a light branching element that causes a first light ray flux emitted from the plurality of first light emitting devices and a second light ray flux emitted from the plurality of second light emitting devices to travel in directions different from each other. The light source array is formed of a plurality of series circuits including a first series circuit and a second series circuit. The first series circuit and the second series circuit each include at least one of the plurality of first light emitting devices and at least one of the plurality of second light emitting devices.

Abstract: A wavelength conversion element includes a wavelength conversion layer having a first surface which excitation light enters, and a second surface opposed to the first surface, and adapted to perform wavelength conversion on the excitation light, a substrate disposed so as to be opposed to the second surface, and a bonding layer adapted to bond the wavelength conversion layer and the substrate to each other, and the bonding layer has a first bonding material disposed in a first region opposed to an incident area of the excitation light in the second surface, and a second bonding material disposed in at least a second region located on an outer periphery of the first region and lower in Young's modulus than the first bonding material.

Abstract: A wavelength conversion element includes a wavelength conversion layer which has a first face on which an excitation light is incident and a second face facing the first face, a first layer which is provided facing the second face and contains a first inorganic oxide, a second layer which is provided facing the first layer and contains a first metal or a second inorganic oxide that is different from the first inorganic oxide, and a third layer which is provided facing the second layer, contains either silver or aluminum, and reflects the excitation light or a light obtained by wavelength conversion of the excitation light by the wavelength conversion layer.

Abstract: A wavelength conversion element includes a substrate; a wavelength conversion portion that converts incident light of a first wavelength into light of a second wavelength different from the light of the first wavelength; and a bonding material that bonds the substrate and the wavelength conversion portion. The wavelength conversion portion includes a first surface on which the light of the first wavelength is incident, and a second surface that is positioned on a side opposite to the first surface. The bonding material bonds the substrate and the second surface of the wavelength conversion portion, and forms a bonding region inside the second surface. The wavelength conversion portion is configured such that an irradiation region irradiated with the light of the first wavelength is set on the first surface inside the bonding region.

Abstract: The color separation/light combining element included in an illuminator has at least one first region and at least one second region. The light ray flux contains a first light ray flux outputted from the first light emission unit and a second light ray flux outputted from the second light emission unit. a wavelength conversion element, a diffusive reflection element, and the color separation/light combining element are so disposed that part of the first light ray flux is incident on the diffusive reflection element via the first region, the other part of the first light ray flux is incident on the wavelength conversion element via the first region, a part of the second light ray flux is incident on the wavelength conversion element via the second region, and the second region combines the converted light with a part of light reflected off the diffusive reflection element to produce illumination light.

Abstract: A wavelength conversion element includes a base material and a phosphor layer that contains a phosphor emitting fluorescence upon incidence of excitation light and is provided on the base material, in which the phosphor layer includes a first surface on which excitation light (blue light) is incident and a second surface facing the base material, and a plurality of regions with different absorption coefficients of the excitation light between the first surface and the second surface.

Abstract: A wavelength conversion element includes a phosphor layer, a support member, and a thermal stress reduction member disposed between the phosphor layer and the support member.

Abstract: The color separation/light combining element included in an illuminator has at least one first region and at least one second region. The light ray flux contains a first light ray flux outputted from the first light emission unit and a second light ray flux outputted from the second light emission unit. a wavelength conversion element, a diffusive reflection element, and the color separation/light combining element are so disposed that part of the first light ray flux is incident on the diffusive reflection element via the first region, the other part of the first light ray flux is incident on the wavelength conversion element via the first region, a part of the second light ray flux is incident on the wavelength conversion element via the second region, and the second region combines the converted light with a part of light reflected off the diffusive reflection element to produce illumination light.

Abstract: A light source apparatus according to an aspect of the invention includes a light source array including a plurality of first light emitting devices and a plurality of second light emitting devices and a light branching element that causes a first light ray flux emitted from the plurality of first light emitting devices and a second light ray flux emitted from the plurality of second light emitting devices to travel in directions different from each other. The light source array is formed of a plurality of series circuits including a first series circuit and a second series circuit. The first series circuit and the second series circuit each include at least one of the plurality of first light emitting devices and at least one of the plurality of second light emitting devices.

Abstract: A wavelength conversion element includes a substrate; a wavelength conversion portion that converts incident light of a first wavelength into light of a second wavelength different from the light of the first wavelength; and a bonding material that bonds the substrate and the wavelength conversion portion. The wavelength conversion portion includes a first surface on which the light of the first wavelength is incident, and a second surface that is positioned on a side opposite to the first surface. The bonding material bonds the substrate and the second surface of the wavelength conversion portion, and forms a bonding region inside the second surface. The wavelength conversion portion is configured such that an irradiation region irradiated with the light of the first wavelength is set on the first surface inside the bonding region.