Photoconversion device and illumination system

A photoconversion device, comprising

• a holder holding an output portion configured to output excitation light;
• a wavelength converter including an incident surface section including a protruding surface to receive an excitation light from the output portion, the wavelength converter being configured to emit a fluorescence in response to the excitation light that is incident on the incident surface section;
• an optical element including a focusing element configured to focus the fluorescence emitted by the wavelength converter onto a focusing plane, the optical element including a conjugate point having a conjugate relation with a point on the focusing plane, the conjugate point being surrounded by the incident surface section;
• and
• a drive configured to change an illuminating area to receive the excitation light in the incident surface section, wherein
• the incident surface section includes a plurality of phosphor areas including a first phosphor area and a second phosphor area,
• the first phosphor area emits a first fluorescence with a first wavelength spectrum in response to the excitation light,
• the second phosphor area emits a second fluorescence with a second wavelength spectrum different from the first wavelength spectrum in response to the excitation light,
• the drive moves a part of at least one of the holder or the wavelength converter to change a relative positional relationship between the output portion and the plurality of phosphor areas,
• the drive includes a mover configured to move the wavelength converter and the holder relative to each other in an intersecting direction intersecting with an optical axis of the excitation light, and
• the plurality of phosphor areas is arranged in the intersecting direction in a plan view of the wavelength converter in a direction parallel to the optical axis.

A photoconversion device, comprising

• a holder holding an output portion configured to output excitation light;
• a wavelength converter including an incident surface section including a protruding surface to receive an excitation light from the output portion, the wavelength converter being configured to emit a fluorescence in response to the excitation light that is incident on the incident surface section;
• and
• an optical element including a reflector surrounding the wavelength converter, the reflector including a focal point surrounded by the incident surface section to direct the fluorescence emitted by the wavelength converter in a predetermined direction, the reflector being configured to reflect the fluorescence emitted by the wavelength converter, wherein
• the incident surface section includes a first incident surface and a second incident surface being opposite to each other, and
• the photoconversion device further comprises a splitter optical system configured to split the excitation light from the output portion into first excitation light and second excitation light and direct the first excitation light to the first incidence surface and direct the second excitation light to the second incidence surface.

A photoconversion device comprising:

• a holder holding an output portion configured to output an excitation light;
• a wavelength converter including an incident surface section including a protruding surface to receive the excitation light from the output portion, the wavelength converter being configured to emit fluorescence in response to the excitation light that is incident on the incident surface section;
• an optical element including a reflector surrounding the wavelength converter, the reflector including a focal point surrounded by the incident surface section to direct a fluorescence emitted by the wavelength converter in a predetermined direction, the reflector being configured to reflect the fluorescence emitted by the wavelength converter;
• and
• a heat sink,
• wherein the wavelength converter includes a first surface as the incident surface section and a second surface different from the first surface,
• the heat sink includes a third surface joined to the second surface,
• the reflector including a reflective surface located opposite to the incident surface section to focus the fluorescence emitted by the wavelength converter toward a focusing portion,
• the wavelength converter is located between the reflective surface and the focusing portion, and
• the heat sink has a width decreasing in a first direction from the wavelength converter toward the focusing portion, and the heat sink has the width in a second direction perpendicular to the first direction.