Abstract: The light source includes first to eighth light sources configured to emit first to eighth lights, respectively. The first light has a first peak wavelength, the second light has a second peak wavelength, the third light has a third peak wavelength, and the fourth light has the second peak wavelength. The fifth light has the third wavelength, the sixth light has the second wavelength, the seventh light has the first wavelength, and the eighth light has the second wavelength. The first and fifth lights pass through a first optical member. The second and sixth lights pass through a second optical member. The third and seventh lights are reflected by the second optical member. The fourth and eighth lights are reflected by the first optical member.

Abstract: A light source device includes a polarization multiplexing member including first and second regions, and a light source part. The light source part includes a first light source configured to emit a first laser beam having a first peak wavelength, a second light source configured to emit a second laser beam a second peak wavelength different from the first peak wavelength, a third light source configured to emit a third laser beam having the first peak wavelength, and a fourth light source configured to emit a fourth laser beam having the second peak wavelength. The first laser beam passes through the first region. The second laser beam passes through the second region. The third laser beam is reflected by the first region. The fourth laser beam is reflected by the second region.

Abstract: A light source device includes a light source device includes a first light source configured to emit first light, and a first lens that includes a first surface on which the first light having a first optical axis is incident and a second surface from which a second light having a second optical axis is emitted. An intensity of the first light has a first value on the first optical axis of the first light.

Abstract: A light emitting module includes: a light source; and an optical member configured to control a distribution of light emitted from the light source. The optical member comprises an incident face on which the light from the light source is incident, and an output face through which the light incident on the incident face exits. In a plan view: the optical member is shaped to have a long axis and a short axis orthogonal to the long axis, and a central axis of the optical member passes through a center of the light source, a center of the incident face, and a center of the output face, while being orthogonal to a long axis direction parallel to the long axis and a short axis direction parallel to the short axis.

Abstract: An optical lens includes a first light incident portion where a narrow-angle light from a light source is incident, a second light incident portion where a wide-angle light from the light source is incident, a first total reflecting portion that totally reflects incident light from the first light incident portion, a second total reflecting portion that totally reflects incident light from the second light incident portion, and a light exiting portion that emits light totally reflected at the second total reflecting portion. The second total reflecting portion allows light totally reflected at the first total reflecting portion to pass through.

Abstract: A light source module includes a light source and a first optical element. The light source is configured to emit first and second light beams. The first optical element has a first surface on which the first second light beam are to be incident. The first light beam and the second light beam are incident on the first surface along a first direction such that the first light beam is incident at a first position on the first surface and the second light beam is incident at a second position on the first surface. The first light beam has a first width in a second direction intersecting the first direction on the first surface, and a second width in a third direction intersecting a plane including the first direction and the second direction on the first surface. The first width is greater than the second width. The second light beam has a third width in the second direction on the first surface, and a fourth width in the third direction on the first surface. The third width is greater than the fourth width.

Abstract: An optical device includes: a plurality of walls including at least a first wall and a second wall, wherein the plurality of walls are concentrically disposed around a first axis so as to be multi-stepped along the first axis, wherein each of the plurality of walls expands outward in a sector shape around the first axis at a predetermined central angle ? and includes an outer circumferential surface, a reflective curved surface at the outer circumferential surface, a first side end portion, and a second side end portion; a first reflective surface meeting the first side end portions of the walls; and a second reflective surface meeting the second side end portions of the walls. The first reflective surface and the second reflective surface meet each other on the first axis.

Abstract: An optical device includes: a light-transmissive member having a first reflective surface configured to reflect, to an arc-shaped first region around a first axis, first light incident along the first axis and having a light distribution characteristic with an optical axis parallel to the first axis; and a reflector having: a second reflective surface and a third reflective surface intersecting each other on the first axis and disposed such that the first reflective surface is located between the second reflective surface and the third reflective surface; and a fourth reflective surface disposed between the second reflective surface and the third reflective surface to reflect the first light to the arc-shaped first region around the first axis.

Abstract: A measurement device for a light-emitting device includes a light attenuator, a photometric sphere, and a light detector. The light attenuator includes a first surface and a heat dissipator. A first light that is emitted from the first light-emitting device is incident on the first surface. The first surface is configured to absorb a portion of the first light. The heat dissipator is configured to dissipate heat of the first surface. The photometric sphere has an inner surface to reflect the first light reflected by the first surface. The light detector is configured to receive at least a portion of the first light reflected by the inner surface.

Abstract: An optical device includes: a light-transmissive member having a first reflective surface configured to reflect, to an arc-shaped first region around a first axis, first light incident along the first axis and having a light distribution characteristic with an optical axis parallel to the first axis; and a reflector having: a second reflective surface and a third reflective surface intersecting each other on the first axis and disposed such that the first reflective surface is located between the second reflective surface and the third reflective surface; and a fourth reflective surface disposed between the second reflective surface and the third reflective surface to reflect the first light to the arc-shaped first region around the first axis.

Abstract: A light source device includes a light source device includes a first light source configured to emit first light, and a first lens that includes a first surface on which the first light having a first optical axis is incident and a second surface from which a second light having a second optical axis is emitted. An intensity of the first light has a first value on the first optical axis of the first light.

Abstract: An optical device includes: a first reflective surface disposed to reflect, to a substantially arc-shaped first region around a first axis, at least a portion of first light incident along the first axis and having a light distribution characteristic with an optical axis parallel to the first axis, the first reflective surface including a plurality of reflective arc surfaces separated in a direction along the first axis; a second reflective surface and a third reflective surface intersecting each other on the first axis and disposed such that the first reflective surface is located between the second reflective surface and the third reflective surface; and a light-transmissive emission surface adapted to refract at least a portion of light reflected by the plurality of reflective arc surfaces to emit the light around the first axis, the emission surface having periodic irregularities in a cross section in the direction along the first axis.

Abstract: An optical device includes: a plurality of walls including at least a first wall and a second wall, wherein the plurality of walls are concentrically disposed around a first axis so as to be multi-stepped along the first axis, wherein each of the plurality of walls expands outward in a sector shape around the first axis at a predetermined central angle ? and includes an outer circumferential surface, a reflective curved surface at the outer circumferential surface, a first side end portion, and a second side end portion; a first reflective surface meeting the first side end portions of the walls; and a second reflective surface meeting the second side end portions of the walls. The first reflective surface and the second reflective surface meet each other on the first axis.

Abstract: A light source module includes a light source configured to emit a first light beam, a first optical element having a first surface on which the first light beam is incident along a first direction, the first surface including a first region on which at least a portion of the first light beam is incident, and a second surface from which the first light beam is emitted, and a second optical element on which the first light beam having emitted from the first optical element is incident. The first light beam has a first width along a second direction and a second width along a third direction. The first width is greater than the second width. The first region has a protruding shape in a first cutting plane including the first and second directions, and has a recessed shape in a second cutting plane including the first and third directions. The second surface has a protruding shape in the first and second cutting planes.

Abstract: An optical device includes: a first reflective surface disposed to reflect, to a substantially arc-shaped first region around a first axis, at least a portion of first light incident along the first axis and having a light distribution characteristic with an optical axis parallel to the first axis, the first reflective surface including a plurality of reflective arc surfaces separated in a direction along the first axis; a second reflective surface and a third reflective surface intersecting each other on the first axis and disposed such that the first reflective surface is located between the second reflective surface and the third reflective surface; and a light-transmissive emission surface adapted to refract at least a portion of light reflected by the plurality of reflective arc surfaces to emit the light around the first axis, the emission surface having periodic irregularities in a cross section in the direction along the first axis.

Abstract: A lens array includes: an input-lens collective body, which is a collective body of input lenses each having a different optical power in a first direction and in a second direction orthogonal to the first direction, the input lenses being aligned along the second direction for which the input lenses have a larger optical power; and an output-lens collective body, which is a collective body of output lenses each having a different optical power in the first direction and in the second direction orthogonal to the first direction, the output lenses being optically opposed to the input lenses, and being aligned along the second direction. Respective lens dimensions of the input lenses are defined so that the input-lens collective body forms a predetermined irradiated region in the irradiated plane by a collection of irradiated areas of light irradiated from the lens array.

Abstract: A fly-eye lens includes: an incident lens assemblage comprising a plurality of incident lenses that are aligned in a vertical direction, wherein each of the incident lenses has a quadrangular shape, wherein horizontal lens widths of the incident lens are the same, and wherein vertical lens widths of at least some of the incident lens are different from one another; and an emission lens assemblage comprising a plurality of emission lenses that are aligned in the vertical direction so as to be optically opposed to the incident lenses, wherein each of the emission lenses has a quadrangular shape, and wherein horizontal lens widths of the emission lenses lens are the same.

Abstract: A lens array includes: an input-lens collective body, which is a collective body of input lenses each having a different optical power in a first direction and in a second direction orthogonal to the first direction, the input lenses being aligned along the second direction for which the input lenses have a larger optical power; and an output-lens collective body, which is a collective body of output lenses each having a different optical power in the first direction and in the second direction orthogonal to the first direction, the output lenses being optically opposed to the input lenses, and being aligned along the second direction. Respective lens dimensions of the input lenses are defined so that the input-lens collective body forms a predetermined irradiated region in the irradiated plane by a collection of irradiated areas of light irradiated from the lens array.

Abstract: A fly-eye lens includes: an incident lens assemblage comprising a plurality of incident lenses that are aligned in a vertical direction, wherein each of the incident lenses has a quadrangular shape, wherein horizontal lens widths of the incident lens are the same, and wherein vertical lens widths of at least some of the incident lens are different from one another; and an emission lens assemblage comprising a plurality of emission lenses that are aligned in the vertical direction so as to be optically opposed to the incident lenses, wherein each of the emission lenses has a quadrangular shape, and wherein horizontal lens widths of the emission lenses lens are the same.

Abstract: A light source device includes a light emitting element and a light transmissive member having a light incident surface opposite to the light emitting element, and a light emitting surface. The light incident surface includes an inner region having a retroreflective lens portion and directly facing the light emitting element, and an outer region having a shape different from a shape of the retroreflective lens.