Abstract: A light source device according to the present disclosure includes a first light source configured to emit a first light flux, a second light source configured to emit a second light flux, a third light source configured to emit a third light flux, a first light combiner configured to enlarge a first light flux width of the first light flux, and combine the first light flux and the second light flux to generate a first combined light flux, and a second light combiner configured to combine the first combined light flux and the third light flux with each other to generate a second combined light flux. The first light flux width is equal to a second light flux width of the second light flux or smaller than the second light flux width, and the first light flux width is smaller than a third light flux width.

Abstract: A light source apparatus according to an aspect of the present disclosure includes a first light source section that outputs first light containing a first polarized component and a second polarized component, a second light source section that outputs second light, a wavelength converter that converts the first light into third light, a light combiner that combines the first light, the second light, and the third light, and a filter that attenuates light of the third wavelength band. The light combiner reflects the first polarized component and transmits the second polarized component to cause one of he first polarized component and the second polarized component to exit toward the wavelength converter, and transmits the first light and the second light or the third light and reflects the third light or the first light and the second light. The filter is movable.

Abstract: A wavelength conversion element according to the present disclosure includes: a wavelength conversion layer; a first substrate; a second substrate; a first intermediate layer; and a second intermediate layer. A linear expansion coefficient of the first substrate is smaller than a linear expansion coefficient of the wavelength conversion layer. The linear expansion coefficient of the wavelength conversion layer is smaller than a linear expansion coefficient of the second substrate. The linear expansion coefficient of the first substrate is smaller than the linear expansion coefficient of the second substrate. A thermal conductivity of the first substrate is larger than a thermal conductivity of the wavelength conversion layer. A thermal conductivity of the second substrate is larger than the thermal conductivity of the wavelength conversion layer.

Abstract: A wavelength conversion element according to the present disclosure includes a substrate, a dichroic layer provided to a first surface of the substrate, an intermediate layer disposed so as to be opposed to the substrate via the dichroic layer, and a wavelength conversion layer disposed so as to be opposed to the dichroic layer via the intermediate layer, and configured to convert light in a first wavelength band into light in a second wavelength band. The dichroic layer has two or more types of refractive index layers having respective refractive indexes different from each other.

Abstract: A light source device according to the present disclosure includes a light source section, a first polarization split element for transmitting first light with a first polarization direction from the light source section and reflecting the first light with a second polarization direction, a first retardation element, a second polarization split element for reflecting the first light in the second polarization direction from the first retardation element, a second retardation element, and a light conversion device having a diffusion element for diffusing the first light from the second retardation element, a first wavelength conversion element for performing wavelength conversion on the first light to emit second light, and a substrate.

Abstract: Alight source device according to the present disclosure includes a light source section configured to emit first light in a first wavelength band, a first optical element configured to collect the first light emitted from the light source section, a second optical element having a first plane of incidence and a first exit surface, and a wavelength conversion element having a second plane of incidence and a second exit surface, and configured to convert the first light entering the wavelength conversion element through the second plane of incidence into second light having a second wavelength band, wherein the second optical element and the wavelength conversion element are disposed in a state in which the first exit surface and the second plane of incidence are opposed to each other at a distance from each other, and the second plane of incidence is larger in size than the first exit surface.

Abstract: A light source device according to the present disclosure includes a light source section, a first polarization split element for transmitting first light with a first polarization direction from the light source section and reflecting the first light with a second polarization direction, a first retardation element, a second polarization split element for reflecting the first light in the second polarization direction from the first retardation element, a second retardation element, and a light conversion device having a diffusion element for diffusing the first light from the second retardation element, a first wavelength conversion element for performing wavelength conversion on the first light to emit second light, and a substrate.

Abstract: A light source apparatus according to the present disclosure includes a light source section, a first polarization separator that transmits in a first polarization component of the first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, a first wavelength converter that converts the wavelength of the first polarization component into second light, and a second wavelength converter that is disposed in a position shifted in a fifth direction from a placement plane where the first polarization separator and the second polarization separator are placed, converts the wavelength of the excitation light into third light, and the second polarization separator transmits the first polarization component of the second light and reflects the second polarization component of the second light.

Abstract: A light source device according to the present disclosure includes a light source section, a first light separation element for transmitting a part of first light entering the first light separation element irrespective of a polarization component, and reflecting another part of the first light irrespective of a polarization component, a second light separation element for reflecting a part of the first light entering the second light separation element, a diffusion element for diffusing and emitting another part of the first light entering the diffusion element, and a wavelength conversion element for performing wavelength conversion on a part of the first light entering the wavelength conversion element to emit second light, wherein the second light separation element transmits a first polarization component with respect to the second light, and reflects a second polarization component.

Abstract: A wavelength converter according to the present disclosure includes a wavelength conversion layer that has a first surface and a second surface different from the first surface and converts excitation light that belongs to a first wavelength band into fluorescence that belongs to a second wavelength band different from the first wavelength band, a first light transmissive member that has a third surface on which the excitation light is incident and a fourth surface different from the third surface and transmits at least the excitation light, and a first layer provided between the first surface of the wavelength conversion layer and the fourth surface of the first light transmissive member, which are surfaces facing each other. The refractive index of the first light transmissive member is greater than the refractive index of the wavelength conversion layer, and the first layer transmits the excitation light and reflects the fluorescence.

Abstract: A wavelength conversion element according to the present disclosure includes a substrate, a dichroic layer provided to a first surface of the substrate, an intermediate layer disposed so as to be opposed to the substrate via the dichroic layer, and a wavelength conversion layer disposed so as to be opposed to the dichroic layer via the intermediate layer, and configured to convert light in a first wavelength band into light in a second wavelength band. The dichroic layer has two or more types of refractive index layers having respective refractive indexes different from each other.

Abstract: A wavelength conversion element according to the present disclosure includes: a wavelength conversion layer; a first substrate; a second substrate; a first intermediate layer; and a second intermediate layer. A linear expansion coefficient of the first substrate is smaller than a linear expansion coefficient of the wavelength conversion layer. The linear expansion coefficient of the wavelength conversion layer is smaller than a linear expansion coefficient of the second substrate. The linear expansion coefficient of the first substrate is smaller than the linear expansion coefficient of the second substrate. A thermal conductivity of the first substrate is larger than a thermal conductivity of the wavelength conversion layer. A thermal conductivity of the second substrate is larger than the thermal conductivity of the wavelength conversion layer.

Abstract: A light source apparatus according to the present disclosure includes a light source section, a first polarization separator that transmits in a first polarization component of the first light and reflects a second polarization component of the first light, a second polarization separator that reflects the first polarization component, a diffuser that diffuses the second polarization component and causes the diffused second polarization component, a first wavelength converter that converts the wavelength of the first polarization component into second light, and a second wavelength converter that is disposed in a position shifted in a fifth direction from a placement plane where the first polarization separator and the second polarization separator are placed, converts the wavelength of the excitation light into third light, and the second polarization separator transmits the first polarization component of the second light and reflects the second polarization component of the second light.

Abstract: A light source device according to the present disclosure includes a light source section, a first light separation element for transmitting a part of first light entering the first light separation element irrespective of a polarization component, and reflecting another part of the first light irrespective of a polarization component, a second light separation element for reflecting a part of the first light entering the second light separation element, a diffusion element for diffusing and emitting another part of the first light entering the diffusion element, and a wavelength conversion element for performing wavelength conversion on a part of the first light entering the wavelength conversion element to emit second light, wherein the second light separation element transmits a first polarization component with respect to the second light, and reflects a second polarization component.

Abstract: Alight source device according to the present disclosure includes a light source section configured to emit first light in a first wavelength band, a first optical element configured to collect the first light emitted from the light source section, a second optical element having a first plane of incidence and a first exit surface, and a wavelength conversion element having a second plane of incidence and a second exit surface, and configured to convert the first light entering the wavelength conversion element through the second plane of incidence into second light having a second wavelength band, wherein the second optical element and the wavelength conversion element are disposed in a state in which the first exit surface and the second plane of incidence are opposed to each other at a distance from each other, and the second plane of incidence is larger in size than the first exit surface.

Abstract: An illuminator includes a first light source unit that includes a first light source region, a second light source unit, and a light ray flux adjusting system. The first light source region outputs parallelized first color light. The first light source unit outputs first light containing the first color light. The second light source unit outputs parallelized second light thicker than the first light. The second light is formed of second color light having a color different from the color of the first color light. The light ray flux adjusting system is in the optical path of the first light. The difference in thickness between the first light and the second light on the downstream of the light ray flux adjusting system is smaller than the difference in thickness between the first light and the second light on the upstream of the light ray flux adjusting system.

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 converter according to the present disclosure includes a wavelength conversion layer that has a first surface and a second surface different from the first surface and converts excitation light that belongs to a first wavelength band into fluorescence that belongs to a second wavelength band different from the first wavelength band, a first light transmissive member that has a third surface on which the excitation light is incident and a fourth surface different from the third surface and transmits at least the excitation light, and a first layer provided between the first surface of the wavelength conversion layer and the fourth surface of the first light transmissive member, which are surfaces facing each other. The refractive index of the first light transmissive member is greater than the refractive index of the wavelength conversion layer, and the first layer transmits the excitation light and reflects the fluorescence.

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: An illuminator includes a first light source unit that includes a first light source region, a second light source unit, and a light ray flux adjusting system. The first light source region outputs parallelized first color light. The first light source unit outputs first light containing the first color light. The second light source unit outputs parallelized second light thicker than the first light. The second light is formed of second color light having a color different from the color of the first color light. The light ray flux adjusting system is in the optical path of the first light. The difference in thickness between the first light and the second light on the downstream of the light ray flux adjusting system is smaller than the difference in thickness between the first light and the second light on the upstream of the light ray flux adjusting system.