Abstract: An ultraviolet optical system includes an objective lens group that captures ultraviolet light for each angle from an ultraviolet light source and forms an intermediate image, and an imaging lens group that re-images the intermediate image. Neither the objective lens group nor the imaging lens group has a cemented surface, and all lenses included in the objective lens group and in the imaging lens group are single lenses that transmit ultraviolet light having a wavelength of 300 nm or shorter. A light distribution measuring apparatus includes the ultraviolet optical system and a sensor, and outputs light distribution of the ultraviolet light source by using a signal obtained by the sensor. The ultraviolet optical system is positioned such that the intermediate image is re-imaged on a light receiving sensor surface, and the sensor has light receiving sensitivity to ultraviolet light having a wavelength of 300 nm or shorter.

Abstract: The photometric device includes a variable light attenuator. The variable light attenuator includes a plurality of light attenuation filters and a driving device. Each of the plurality of light attenuation filters includes an interference multilayer film and a transparent substrate. A combination of any two of the plurality of light attenuation filters is set as a first light attenuation filter and a second light attenuation filter. A first optical path length of the first transparent substrate of the first light attenuation filter is different from a second optical path length of the second transparent substrate of the second light attenuation filter.

Abstract: A vehicle airbag device includes: an inflator configured to generate gas when a first squib and a second squib are fired, respectively; an airbag including a main bag portion configured to inflate and deploy between an occupant seated in a passenger seat and an instrument panel and between the occupant and a windshield when the gas generated by the inflator is supplied into the airbag, and a center bag portion configured to project between the passenger seat and a driver seat from the main bag portion; and a controlling portion configured to control the inflator such that, when a head-on collision occurs, the second squib is fired after the first squib is fired, and when an oblique collision occurs, the second squib is fired after the first squib is fired and at a timing earlier than that when the head-on collision occurs.

Abstract: An ultraviolet optical system includes an objective lens group that captures ultraviolet light for each angle from an ultraviolet light source and forms an intermediate image, and an imaging lens group that re-images the intermediate image. Neither the objective lens group nor the imaging lens group has a cemented surface, and all lenses included in the objective lens group and in the imaging lens group are single lenses that transmit ultraviolet light having a wavelength of 300 mn or shorter. A light distribution measuring apparatus includes the ultraviolet optical system and a sensor, and outputs light distribution of the ultraviolet light source by using a signal obtained by the sensor. The ultraviolet optical system is positioned such that the intermediate image is re-imaged on a light receiving sensor surface, and the sensor has light receiving sensitivity to ultraviolet light having a wavelength of 300 nm or shorter.

Abstract: A seat belt device includes a buckle provided on a side portion of a seat for a vehicle, and configured such that a tongue plate is inserted into the buckle; a buckle force limiter mechanism connected to the buckle via a connecting member having an elongate shape, the buckle force limiter mechanism being configured to allow the buckle to move in a pulling direction when a tensile load equal to or larger than a predetermined tensile load is applied to the buckle; and a case covering the connecting member from an inner side in a seat width direction, the case having a corner at an upper end portion of the case, the corner facing the connecting member, and the corner having an arc shape.

Abstract: A seat belt device includes a buckle provided on a side portion of a seat for a vehicle, and configured such that a tongue plate is inserted into the buckle; a buckle force limiter mechanism connected to the buckle via a connecting member having an elongate shape, the buckle force limiter mechanism being configured to allow the buckle to move in a pulling direction when a tensile load equal to or larger than a predetermined tensile load is applied to the buckle; and a case covering the connecting member from an inner side in a seat width direction, the case having a corner at an upper end portion of the case, the corner facing the connecting member, and the corner having an arc shape.

Abstract: A vehicle airbag device includes: an inflator configured to generate gas when a first squib and a second squib are fired, respectively; an airbag including a main bag portion configured to inflate and deploy between an occupant seated in a passenger seat and an instrument panel and between the occupant and a windshield when the gas generated by the inflator is supplied into the airbag, and a center bag portion configured to project between the passenger seat and a driver seat from the main bag portion; and a controlling portion configured to control the inflator such that, when a head-on collision occurs, the second squib is fired after the first squib is fired, and when an oblique collision occurs, the second squib is fired after the first squib is fired and at a timing earlier than that when the head-on collision occurs.

Abstract: A surface-emitting unit includes a surface-emitting panel which emits light, a transmissive member which is arranged to face a light-emitting surface, propagates light emitted from the surface-emitting panel as being reflected therein, and allows light to exit from a light exit surface, and a scattering sheet which is provided to face a light exit surface of the transmissive member and scatters light. The transmissive member has a dimming surface provided between a light incident surface on which light emitted from the surface-emitting panel is incident and the light exit surface. The light-emitting surface has a light-emitting region which emits light and a non-light-emitting region which does not emit light. The dimming surface is configured such that a region facing the non-light-emitting region is different in transmittance of light from a region facing the light-emitting region, in accordance with a distribution of light emitted from each of the surface-emitting panels.

Abstract: A planar light-emitting unit includes a light emission region and a non-light emission region located in an outer periphery of the light emission region. A non-space region is provided between a light guide member and a diffusion member in a region corresponding to the non-light emission region such that a space is formed in a region corresponding to the light emission region between the light guide member and the diffusion member. The non-space region includes a protruding region extending to the light emission region from the non-light emission region, and a conditional expression 0<??2d×tan ? is fulfilled, where ? is a protruding amount (mm) from the non-light emission region of the non-space region, d is a thickness (mm) of the light guide member, and ? is a total reflection critical angle between the light guide member and air.

Abstract: A planar light-emitting unit includes a light emission region and a non-light emission region located in an outer periphery of the light emission region. A non-space region is provided between a light guide member and a diffusion member in a region corresponding to the non-light emission region such that a space is formed in a region corresponding to the light emission region between the light guide member and the diffusion member. The non-space region includes a protruding region extending to the light emission region from the non-light emission region, and a conditional expression 0<??2d×tan? is fulfilled, where ? is a protruding amount (mm) from the non-light emission region of the non-space region, d is a thickness (mm) of the light guide member, and ? is a total reflection critical angle between the light guide member and air.

Abstract: A surface-emitting unit includes a surface-emitting panel which emits light, a transmissive member which is arranged to face a light-emitting surface, propagates light emitted from the surface-emitting panel as being reflected therein, and allows light to exit from a light exit surface, and a scattering sheet which is provided to face a light exit surface of the transmissive member and scatters light. The transmissive member has a dimming surface provided between a light incident surface on which light emitted from the surface-emitting panel is incident and the light exit surface. The light-emitting surface has a light-emitting region which emits light and a non-light-emitting region which does not emit light. The dimming surface is configured such that a region facing the non-light-emitting region is different in transmittance of light from a region facing the light-emitting region, in accordance with a distribution of light emitted from each of the surface-emitting panels.

Abstract: A surface-emitting unit includes a surface-emitting panel which emits light, a transmissive member which is arranged to face a light-emitting surface and propagates light emitted from the surface-emitting panel, and a reflection member which scatters propagated light. The light-emitting surface has a light-emitting region and a non-light-emitting region. The reflection member is provided on the surface-emitting panel so as to overlap with the non-light-emitting region. When a light distribution curve in a plane perpendicular to the light-emitting surface is drawn for each surface-emitting panel, the light distribution curve has at least a portion in which a condition of L>cos ? is satisfied, with a luminance on a front side along an axis extending in a direction of normal to the light-emitting surface being defined as 1 and L representing a luminance in a direction in which an angle formed with respect to the axis in the plane is ?.

Abstract: An optical path of measurement light emitted from a measurement light source is overlaid by a beam combiner on an optical path of reference light emitted from a reference light source. The measurement light emitted from the measurement light source includes light in the sensitivity wavelength range (S1) of a measurement light detector and light in the sensitivity wavelength range (S2) of a reference light detector. An interferometer includes a wavelength separation filter that cuts light in at least a part of the sensitivity wavelength range (S2) of the reference light detector, of light included in the wavelength range of the measurement light.

Abstract: A surface light-emitting unit includes light-emitting panels, a reflective member for reflecting part of light emitted from the light-emitting panels toward the front side, a first diffusion plate arranged so as to be opposed to the light-emitting panels and the reflective member at a distance therefrom, and a second diffusion plate positioned on the opposite side to the light-emitting panels as viewed from the first diffusion plate for diffusing light from the first diffusion plate.

Abstract: An illumination apparatus includes: a plurality of light emitting panels each having a surface with a light emitting region and a non-light emitting region; a light guiding member having a light incidence face and a light exit face, with the light incidence face opposite to the surface of the light emitting panel; a reflector opposite to the non-light emitting region, and reflecting the light incident on the light guiding member; a light attenuator on the light exit face opposite to the light emitting region, and attenuating the light outputted through an area on the light exit face, the area being opposite to the light emitting region; and a light diffusion member opposite to the light guiding member with a gap therebetween.

Abstract: An interferometer (1) measures a measuring interference beam, while detecting the position of a moving mirror (16) on the basis of detection results obtained from a reference beam detector (25). In the interferometer, a reference beam source (21) is configured by including a light source (21a) composed of a semiconductor laser device. A reference optical system (20) has a collimating optical system (22) for a reference beam, said collimating optical system converting a laser beam outputted from the reference beam source (21) into a collimated beam, and the collimated beam is diagonally inputted to a fixed mirror (15).

Abstract: Provided is a small, highly accurate Fourier spectrometer which enables highly accurate detection of an optical path difference in an interferometer. An element for changing to a narrow band is provided to return reflected light to a second light source (4), and the wavelength of light emitted by the second light source is locked, whereby the position of a movable mirror (8) is measured highly accurately and an optical path length (1) and an optical path length (2) match highly accurately.

Abstract: An optical semiconductor package includes an optical semiconductor device, a temperature detection unit, and a temperature control unit including a support member, the optical semiconductor device and the temperature detection unit being arranged such that a temperature of a portion of a surface of the support member where the optical semiconductor device is arranged and a temperature of a portion of the surface of the support member where the temperature detection unit is arranged are substantially in thermal equilibrium with each other.

Abstract: An optical path of measurement light emitted from a measurement light source is overlaid by a beam combiner on an optical path of reference light emitted from a reference light source. The measurement light emitted from the measurement light source includes light in the sensitivity wavelength range (S1) of a measurement light detector and light in the sensitivity wavelength range (S2) of a reference light detector. An interferometer includes a wavelength separation filter that cuts light in at least a part of the sensitivity wavelength range (S2) of the reference light detector, of light included in the wavelength range of the measurement light.

Abstract: An interferometer (1) measures a measuring interference beam, while detecting the position of a moving mirror (16) on the basis of detection results obtained from a reference beam detector (25). In the interferometer, a reference beam source (21) is configured by including a light source (21a) composed of a semiconductor laser device. A reference optical system (20) has a collimating optical system (22) for a reference beam, said collimating optical system converting a laser beam outputted from the reference beam source (21) into a collimated beam, and the collimated beam is diagonally inputted to a fixed mirror (15).