Abstract: An optical element unit according to an aspect of the present disclosure includes an optical element wheel that includes a heat dissipation member provided at one surface of a wheel substrate, a hosing including an outer circumferential wall that covers the outer circumference of the optical element wheel, and an opening formed at part of the outer circumferential wall, the housing capable of housing the optical element wheel, a first duct which is provided at the opening of the housing and via which the airflow generated by the optical element wheel is exhausted out of the housing, a heat exchanger which is disposed at the outlet of the first duct and to which the airflow exhausted via the outlet flows, and a second duct that guides the airflow having flowed through the heat exchanger to the heat dissipation member of the optical element wheel.

Abstract: The disclosure relates to a light source apparatus including a solid-state light source, a phosphor on which light emitted from the solid-state light source is incident, an optical system that guides the light emitted from the solid-state light source at least to the phosphor, an enclosure member having a first accommodation space that accommodates the phosphor and a second accommodation space that accommodates the optical system, and an air blowing mechanism that blows air into the first accommodation space, wherein the optical system includes a pickup lens on which fluorescence emitted from the phosphor is incident, and the first accommodation space and the second accommodation space are separated from each other by a holding member that holds the pickup lens.

Abstract: A projector includes an image formation apparatus that forms an image, a lens barrel that accommodates a projection lens that projects the formed image, and a light blocking portion that is configured as a member separate from the lens barrel, is located in a position between the image formation apparatus and the lens barrel, and blocks light to be incident on the lens barrel. The configuration of the projector allows blockage of light incident on the lens barrel and hence prevention of distortion of the lens barrel.

Abstract: The disclosure relates to a light source apparatus including a solid-state light source, a phosphor on which light emitted from the solid-state light source is incident, an optical system that guides the light emitted from the solid-state light source at least to the phosphor, an enclosure member having a first accommodation space that accommodates the phosphor and a second accommodation space that accommodates the optical system, and an air blowing mechanism that blows air into the first accommodation space, wherein the optical system includes a pickup lens on which fluorescence emitted from the phosphor is incident, and the first accommodation space and the second accommodation space are separated from each other by a holding member that holds the pickup lens.

Abstract: A projector includes an image formation apparatus that forms an image, a lens barrel that accommodates a projection lens that projects the formed image, and a light blocking portion that is configured as a member separate from the lens barrel, is located in a position between the image formation apparatus and the lens barrel, and blocks light to be incident on the lens barrel. The configuration of the projector allows blockage of light incident on the lens barrel and hence prevention of distortion of the lens barrel.