Abstract: An optical receptacle includes an optical receptacle main body and a cylindrical fixing member. The optical receptacle main body includes a first optical surface, a second optical surface, and an annular groove disposed to surround a first central axis of the first optical surface or disposed to surround a second central axis of the second optical surface. The fixing member is configured with a material with a smaller linear expansion coefficient than that of the optical receptacle main body, and is fit to the groove so as to be in contact with at least a part of an inner surface of the groove.

Abstract: An optical receptacle includes an optical receptacle main body and a cylindrical fixing member. The optical receptacle main body includes a first optical surface, a second optical surface, and an annular groove disposed to surround a first central axis of the first optical surface or disposed to surround a second central axis of the second optical surface. The fixing member is configured with a material with a smaller linear expansion coefficient than that of the optical receptacle main body, and is fit to the groove so as to be in contact with at least a part of an inner surface of the groove.

Abstract: The light flux controlling member according to the present invention comprises: an incident surface which is disposed on the back side so as to intersect with a central axis of a light flux controlling member, and on which a part of the light emitted from a light-emitting element falls; a reflection portion arranged on the back side so as to surround the incident surface; a total reflection surface that is disposed on the front side so as to intersect with the central axis, and reflects sidewise the light incident on the incident surface; and an emission surface that is disposed so as to surround the central axis and the total reflection surface and emits light reflected by the total reflection surface. The reflection portion has a plurality of ridges for reflecting light that has reached the reflection portion after Fresnel reflection on the emission surface.

Abstract: The present invention provides a lens (i.e., luminous flux control member) for an optical element of a backlight, capable of easily aligning the orientation in the plane direction. The luminous flux control member according to the present invention includes a lens main body and legs. The lens main body includes a light-entering area for light emitted from a light-emitting element to enter on the lower surface side and a light-emitting area for emitting the light entered from the light-entering area to the outside on the upper surface side. The legs are legs for mounting the luminous flux control member on a substrate on which the light-emitting element is mounted and are disposed on the lower surface of the lens main body so as to project downward.

Abstract: A planar light source device having a plurality of light emission devices and a light diffusion plate. For each of the light emission devices, the light beam from among light beams satisfying ?3/?1<1 that has the smallest emission angle ?1xmin satisfies the relationship Ax<Px, where Ax is the distance from the center axis of the point on the light diffusion plate that is reached by the light beam emitted at the emission angle ?1xmin, which is greater than Px/2. The light beam from among light beams satisfying ?3/?1<1 that has the smallest emission angle ?1ymin satisfies the relationship Ay<Py, where Ay is the distance from the center axis of the point on the light diffusion plate that is reached by the light beam emitted at the emission angle ?1ymin, which is greater than Py/2.

Abstract: This planar light source device comprises a base board, a light-emitting device and a diffusing plate. The light-emitting device includes a light-emitting element and a light flux control member. The light flux control member has an entry surface, an exit surface, and a gate mark. The entry surface and the exit surface are formed in such a manner that the illuminance distribution on the diffusing plate has an anisotropy wherein the light reaches farther in the directions of 1 or more predetermined horizontal angles ? than in other directions, when assuming that the light is emitted from the light-emitting device in a state wherein the light flux control member does not have the gate mark. The horizontal angle ? range of the gate mark includes any one among the 1 or more predetermined horizontal angles ?.

Abstract: The present invention provides a lens (i.e., luminous flux control member) for an optical element of a backlight, capable of easily aligning the orientation in the plane direction. The luminous flux control member according to the present invention includes a lens main body and legs. The lens main body includes a light-entering area for light emitted from a light-emitting element to enter on the lower surface side and a light-emitting area for emitting the light entered from the light-entering area to the outside on the upper surface side. The legs are legs for mounting the luminous flux control member on a substrate on which the light-emitting element is mounted and are disposed on the lower surface of the lens main body so as to project downward.

Abstract: A planar light source device having a plurality of light emission devices and a light diffusion plate. For each of the light emission devices, the light beam from among light beams satisfying ?3/?1<1 that has the smallest emission angle ?1xmin satisfies the relationship Ax<Px, where Ax is the distance from the center axis of the point on the light diffusion plate that is reached by the light beam emitted at the emission angle ?1xmin, which is greater than Px/2. The light beam from among light beams satisfying ?3/?1<1 that has the smallest emission angle ?1ymin satisfies the relationship Ay<Py, where Ay is the distance from the center axis of the point on the light diffusion plate that is reached by the light beam emitted at the emission angle ?1ymin, which is greater than Py/2.

Abstract: This light flux control member has an incidence surface and an emission surface. The emission surface includes a first emission surface projecting toward the back side and disposed so as to cross the central axis, and a second emission surface projecting toward the front side and disposed so as to surround the first emission surface. When the light-emitting element is disposed so as to face the recessed part such that a light emission center thereof is located on the central axis, and a surface to be irradiated is disposed above the emission surface so as to lie at right angles to the central axis, a second maximum value calculated by a predetermined expression is larger than a first maximum value calculated by a predetermined expression.

Abstract: This planar light source device comprises a base board, a light-emitting device and a diffusing plate. The light-emitting device includes a light-emitting element and a light flux control member. The light flux control member has an entry surface, an exit surface, and a gate mark. The entry surface and the exit surface are formed in such a manner that the illuminance distribution on the diffusing plate has an anisotropy wherein the light reaches farther in the directions of 1 or more predetermined horizontal angles ? than in other directions, when assuming that the light is emitted from the light-emitting device in a state wherein the light flux control member does not have the gate mark. The horizontal angle ? range of the gate mark includes any one among the 1 or more predetermined horizontal angles ?.

Abstract: This light flux control member has an incidence surface and an emission surface. The emission surface includes a first emission surface projecting toward the back side and disposed so as to cross the central axis, and a second emission surface projecting toward the front side and disposed so as to surround the first emission surface. When the light-emitting element is disposed so as to face the recessed part such that a light emission center thereof is located on the central axis, and a surface to be irradiated is disposed above the emission surface so as to lie at right angles to the central axis, a second maximum value calculated by a predetermined expression is larger than a first maximum value calculated by a predetermined expression.

Abstract: This light flux control member comprises an entry surface, a reflective surface, a circular groove containing a first circular surface and a second circular surface, and an exit surface. The circular groove is disposed in such a manner as not to intersect with the optical path of a light from the entry surface to the reflective surface, and, in such a manner as to intersect with at least a portion of the optical path of a light, from being emitted from a point other than the center of the light-emitting element, entering at the entry surface and being reflected at the reflective surface, to reaching the exit surface. The second circular surface is formed in such a manner that the width of the circular groove widens as the opening ridges of the circular groove is approached from the valley portion of the circular groove.

Abstract: This light flux control member comprises an entry surface, a reflective surface, a circular groove containing a first circular surface and a second circular surface, and an exit surface. The circular groove is disposed in such a manner as not to intersect with the optical path of a light from the entry surface to the reflective surface, and, in such a manner as to intersect with at least a portion of the optical path of a light, from being emitted from a point other than the center of the light-emitting element, entering at the entry surface and being reflected at the reflective surface, to reaching the exit surface. The second circular surface is formed in such a manner that the width of the circular groove widens as the opening ridges of the circular groove is approached from the valley portion of the circular groove.

Abstract: A light emitting device comprises a light emitting element and a light flux controlling member configured to control the distribution of light emitted from the light emitting element. The light flux controlling member comprises an incidence surface including an outer incidence surface including an inclining surface formed such that the distance from the light emitting element increases as the distance from the optical axis of the light emitted from the light emitting element increases and an inner incidence surface, a reflection surface disposed on a side of the light flux controlling member opposite to the incidence surface, and a emission surface disposed to surround the optical axis. Light emitted from the light emitting surface center of the light emitting element does not reach the inclining surface.

Abstract: A light emitting device comprises a light emitting element and a light flux controlling member configured to control the distribution of light emitted from the light emitting element. The light flux controlling member comprises an incidence surface including an outer incidence surface including an inclining surface formed such that the distance from the light emitting element increases as the distance from the optical axis of the light emitted from the light emitting element increases and an inner incidence surface, a reflection surface disposed on a side of the light flux controlling member opposite to the incidence surface, and a emission surface disposed to surround the optical axis. Light emitted from the light emitting surface center of the light emitting element does not reach the inclining surface.

Abstract: With proposed radiation thermometry and radiation thermometry system (10), a thin-film (2) is disposed on a substrate to make a thin-film substrate, and measurement is conducted for polarized radiance components emitted from the thin-film (2) in a direction which is within an angle range ? eic, from a planar normal line of the thin-film (2), where radiance components remain invariable. A temperature of the thin-film (2) is determined on the basis of the measured results of the polarized radiance components. The polarized radiance components are measured using a radiometer (4) by measuring p-wave polarized radiance components which are parallel to an emitting surface including a direction where the polarized radiance components are measured. A pseudo-blackbody (5) is disposed in a mirror symmetrical state to the radiometer (4), and absorbs and negates background radiations to the radiometer (4).