Abstract: A log feeding apparatus for feeding a log to first and second cutting spindles is provided, in which a log is fed to a second receiving position when centering spindles have reached a second delivery position that is away from the second receiving position downstream in the direction of log transport by a distance equal to or greater than an assumed maximum diameter of the log. That is, a new log is transported to the second receiving position by placing sections when the log held between the centering spindles reaches a position that will avoid contact with the new log. As a result, the time can be reduced for transporting the log to the cutting spindles.

Abstract: A light emission device includes: a laser light source; an electric storage element for supplying a drive current to the laser light source; a switch element connected in series to the laser light source; and a monitoring circuit configured to monitor temporal change in a voltage of the electric storage element.

Abstract: A light emission device includes: a laser light source; an electric storage element for supplying a drive current to the laser light source; a plurality of switch elements connected in series to the laser light source; and an electrical element placed at least between a ground and an input part, for a switch opening/closing signal, of the switch element to which another one of the switch elements is connected on a downstream side, and configured to guide noise having a high level exceeding a voltage level of the switch opening/closing signal, to the ground.

Abstract: Included are: a laser light source which emits a plurality of laser beams; an aspherical lens which the plurality of laser beams emitted from the laser light source enters and which converts the plurality of laser beams into convergent beams; and a phosphor which is irradiated with the convergent beams from the aspherical lens as excitation beams to generate fluorescence, wherein the plurality of laser beams have different spread angles in a horizontal direction and a vertical direction and enter the aspherical lens while arranged in a direction in which the spread angle is smaller, from among the horizontal direction and the vertical direction, and the aspherical lens has a function of equalizing a light intensity in a direction in which the spread angle is larger, from among the horizontal direction and the vertical direction.

Abstract: A log feeding apparatus for feeding a log to first and second cutting spindles is provided, in which a log is fed to a second receiving position when centering spindles have reached second delivery position that is away from the second receiving position downward in the direction of log transport by a distance equal to or greater than an assumed maximum diameter of the log. That is, a new log is transported to the second receiving position when the log transported by placing sections reaches a position not to contact the log held between the centering spindles. As a result, the time can be reduced for transporting the log to the cutting spindles.

Abstract: Included are: a laser light source which emits a plurality of laser beams; an aspherical lens which the plurality of laser beams emitted from the laser light source enters and which converts the plurality of laser beams into convergent beams; and a phosphor which is irradiated with the convergent beams from the aspherical lens as excitation beams to generate fluorescence, wherein the plurality of laser beams have different spread angles in a horizontal direction and a vertical direction and enter the aspherical lens while arranged in a direction in which the spread angle is smaller, from among the horizontal direction and the vertical direction, and the aspherical lens has a function of equalizing a light intensity in a direction in which the spread angle is larger, from among the horizontal direction and the vertical direction.

Abstract: A light source device includes: a semiconductor light-emitting device including a flat-shaped base having a first main surface on a first side and a second main surface and a semiconductor light-emitting element disposed on the first side; a first fixing component having a first through-hole and a first pressing surface that presses the first main surface; and a second fixing component having a second through-hole and a second pressing surface that presses the second main surface. The base is fixed between the first and second pressing surfaces by an engagement between a first inner surface surrounding the first through-hole of the first fixing component and a second outer surface of the second fixing component. A distance between the first and second pressing surfaces is smaller than or equal to a thickness of the base, and a void is formed lateral to the base between the first and second pressing surfaces.

Abstract: A light emitting device includes: a laser light source which emits a laser beam; a fluorescent member which emits fluorescence when irradiated with the laser beam emitted from the laser light source; and a light separation element on which the laser beam and the fluorescence are incident and which causes the laser beam and the fluorescence to travel in mutually different directions.

Abstract: A light source device includes: a semiconductor light-emitting device including a flat-shaped base having a first main surface on a first side and a second main surface and a semiconductor light-emitting element disposed on the first side; a first fixing component having a first through-hole and a first pressing surface that presses the first main surface; and a second fixing component having a second through-hole and a second pressing surface that presses the second main surface. The base is fixed between the first and second pressing surfaces by an engagement between a first inner surface surrounding the first through-hole of the first fixing component and a second outer surface of the second fixing component. A distance between the first and second pressing surfaces is smaller than or equal to a thickness of the base, and a void is formed lateral to the base between the first and second pressing surfaces.

Abstract: The present disclosure aims to enhance controllability of a lighting apparatus and increase durability. A lighting apparatus includes a light source; a condenser that converges first light emitted from the light source onto a predetermined focal position of a wavelength conversion element as converged light; the wavelength conversion element that receives the converged light and emits second light at an emission point; and a projection lens that projects the second light as projection light. The lighting apparatus changes the focal position of the condenser lens to change the emission point of the second light to the projection lens, thereby being capable of projecting the second light in any direction.

Abstract: A projection apparatus of the present disclosure includes a light-emitting element for emitting excitation light, a wavelength converter for receiving the excitation light, converting the excitation light into light of a different wavelength, and emitting the converted light as radiation light, and an optical filter for receiving the radiation light. The optical filter reflects long-wavelength light of wavelengths longer than wavelengths of the radiation light. With this configuration, the optical filter reflects long-wavelength light of wavelengths longer than wavelengths of the radiation light, thus being able to prevent the wavelength converter from being irradiated with long-wavelength light, and being able to prevent deterioration of the wavelength converter.

Abstract: An illumination apparatus of the disclosure includes a semiconductor light-emitting element and a light conversion element. The semiconductor light-emitting element has a first optical waveguide and a second optical waveguide. The light conversion element has a first light converter and a second light converter. A first emitted light emitted from first optical waveguide enters the first light converter and a second emitted light emitted from the second optical waveguide enters the second light converter. First power applied to the first optical waveguide and second power applied to the second optical waveguide are independent.

Abstract: In a light source in which a semiconductor luminescence element and a phosphor are combined, red light having high color purity is efficiently radiated. The light source includes: a semiconductor luminescence element; a fixed or rotatable first wavelength converting unit; and a rotatable second wavelength converting unit. The second wavelength converting unit includes: a second wavelength converting region that absorbs output light emitted from the semiconductor luminescence element and radiates light having a second wavelength different from that of the output light; and a transmission region that transmits the output light. The first wavelength converting unit absorbs the output light to radiate light having a first wavelength longer than the second wavelength of the light, and the light having the first wavelength is transmitted through the transmission region.

Abstract: A wavelength conversion member includes: a heat conducting layer; a sapphire substrate having a third surface directly contact with a second surface of the heat conducting layer and the fourth surface opposite to the third surface; and a phosphor layer having a fifth surface directly contact with the fourth surface and a sixth surface opposite to the fifth surface, the phosphor layer including phosphor. At least one of an area of a first surface and an area of the second surface of the heat conducting layer is at least 2800 times as large as an area of the sixth surface of the phosphor layer. At least one of an area of the third surface and an area of the fourth surface of the sapphire substrate is at least two times as large as the area of the sixth surface of the phosphor layer.

Abstract: The present disclosure aims to enhance controllability of a lighting apparatus and increase durability. A lighting apparatus includes a light source; a condenser that converges first light emitted from the light source onto a predetermined focal position of a wavelength conversion element as converged light; the wavelength conversion element that receives the converged light and emits second light at an emission point; and a projection lens that projects the second light as projection light. The lighting apparatus changes the focal position of the condenser lens to change the emission point of the second light to the projection lens, thereby being capable of projecting the second light in any direction.

Abstract: An illumination apparatus of the disclosure includes a semiconductor light-emitting element and a light conversion element. The semiconductor light-emitting element has a first optical waveguide and a second optical waveguide. The light conversion element has a first light converter and a second light converter. A first emitted light emitted from first optical waveguide enters the first light converter and a second emitted light emitted from the second optical waveguide enters the second light converter. First power applied to the first optical waveguide and second power applied to the second optical waveguide are independent.

Abstract: A projection apparatus of the present disclosure includes a light-emitting element for emitting excitation light, a wavelength converter for receiving the excitation light, converting the excitation light into light of a different wavelength, and emitting the converted light as radiation light, and an optical filter for receiving the radiation light. The optical filter reflects long-wavelength light of wavelengths longer than wavelengths of the radiation light. With this configuration, the optical filter reflects long-wavelength light of wavelengths longer than wavelengths of the radiation light, thus being able to prevent the wavelength converter from being irradiated with long-wavelength light, and being able to prevent deterioration of the wavelength converter.

Abstract: A light-emitting device includes: a semiconductor light-emitting element which emits light of a first wavelength; and a first wavelength conversion unit which includes a first phosphor and emits light of a second wavelength by being excited by the light of the first wavelength. The first phosphor contains europium as an activator. The light of the first wavelength is emitted to the first wavelength conversion unit at 1 kW/cm2 or greater. 1??12/?11?1.17 is satisfied where ?1 is light output ratio of the light of the first wavelength to the light of the second wavelength, ?11 is light output ratio obtained when the light of the first wavelength is emitted to the first wavelength conversion unit at 5 kW/cm2, and ?12 is light output ratio obtained when the light of the first wavelength is emitted to the first wavelength conversion unit at 2.5 kW/cm2.

Abstract: In a light source in which a semiconductor luminescence element and a phosphor are combined, red light having high color purity is efficiently radiated. The light source includes: a semiconductor luminescence element; a fixed or rotatable first wavelength converting unit; and a rotatable second wavelength converting unit. The second wavelength converting unit includes: a second wavelength converting region that absorbs output light emitted from the semiconductor luminescence element and radiates light having a second wavelength different from that of the output light; and a transmission region that transmits the output light. The first wavelength converting unit absorbs the output light to radiate light having a first wavelength longer than the second wavelength of the light, and the light having the first wavelength is transmitted through the transmission region.

Abstract: A wavelength conversion member includes a heat conductor, a light guide path and a wavelength converter. The heat conductor has a recessed portion and an opening extending through the heat conductor. The light guide path includes a transparent material with which the opening is filled. The light guide path includes a light exit port disposed on a side of the recessed portion and a light incident port disposed on a side opposite to the recessed portion. The wavelength converter converts first light having a first peak wavelength incident through the light guide path into second light having a second peak wavelength different from the first peak wavelength. The wavelength converter is disposed in contact with the heat conductor, at least a part of the wavelength converter being embedded in the recessed portion.