Abstract: A light source device includes a connector, a light source, a lever member, and a detector. The connector allows the light guide member to be detachably connected thereto. The light source emits light to be incident on the light guide member connected to the connector. The lever member is displaced depending on presence or absence of the connection of the light guide member to the connector. The detector detects the displacement of the lever member and outputs a detection result.

Abstract: An endoscope system includes: an insertion component which includes a base end and a tip end, and is inserted into a subject at least up to the tip end; a light source which emits first light and second light having a hue different from a hue of the first light a light sensor; and a controller, the insertion component includes: a first light guide member which emits the first light and the second light from the tip end as illumination light; and a second light guide member which guides reflected light of the illumination light emitted from the tip end, the light sensor receives the reflected light guided by the second light guide member, and the controller controls the light source based on the intensity of the reflected light received by the light sensor to stop emission of the at least one of the first light or the second light.

Abstract: A light source device includes a plurality of light sources; a condensing optical member; a fluorescent unit that converts at least a portion of the light from the light sources and condensed by the optical member into light including converted light and light from the light sources; and a sensor that detects an anomaly in the fluorescent unit, such sensor disposed within a circular area circumscribed by the light sources.

Abstract: A device includes a light source; a first lens for condensing light emitted by the light source; a member for converting at least a portion of the condensed light; a sensor for detecting light traveling from the member back towards the light source; and a second lens for directing light traveling back toward the light source to the sensor. The first lens includes a curved first face facing the light source, and a flat second face opposite the first face; the second lens has a curved third face facing away from the first lens and with a curvature different from a curvature of the first face of the first lens, and a flat fourth face facing the second face of the first lens. The second lens is provided between the first lens and the wavelength converting member.

Abstract: A light source device, includes: a plurality of excitation light sources that emit primary light; an optical member that condenses the primary light; a fluorescent unit that emits secondary light including the primary light and wavelength converted light which is at least some of the primary light on which wavelength conversion is performed; and a sensor that detects an anomaly in the fluorescent unit. In addition, when seen along an optical axis of the primary light emitted by the plurality of excitation light sources, the sensor circumscribes, among the plurality of excitation light sources, a first excitation light source and a second excitation light source different from the first excitation light source, and is disposed inside an imaginary circle having, as a diameter, a line segment connecting the first excitation light source and the second excitation light source.

Abstract: A light source device includes: an excitation light source that emits primary light; a first lens that condenses the primary light; a wavelength converting member that emits secondary light including the primary light and wavelength converted light; a sensor that detects an anomaly in the wavelength converting member; and a second lens that causes light which travels back toward the excitation light source to be incident on the sensor. The sensor detects the light via the second lens. The first lens includes (i) a first face through which the primary light enters, and (ii) a second face opposite the first face from which the primary light that has entered from the first face and transmitted through an inside of the first lens exits. The third face of the second lens has a curvature different from a curvature of the first face and the second face of the first lens.

Abstract: A light-emitting device includes: a laser light source that radiates blue-based light as primary light; a wavelength converting member that emits secondary light, the secondary light including wavelength-converted light, the wavelength-converted light being the primary light converted into light having more long-wavelength components than the primary light; a first light-guiding member that transmits the secondary light emitted by the wavelength converting member; and a second light-guiding member which includes a resin material, and transmits the secondary light transmitted by the first light-guiding member, and the first light-guiding member and the second light-guiding member are connected by a connector, the connector including a numerical aperture (NA) converting member that optically connects a transmission path in the first light-guiding member and a transmission path in the second light-guiding member.

Abstract: A light-emitting device includes: a laser light source that radiates blue-based light as primary light; a wavelength converting member that emits secondary light, the secondary light including wavelength-converted light, the wavelength-converted light being the primary light converted into light having more long-wavelength components than the primary light; a first light-guiding member that transmits the secondary light emitted by the wavelength converting member; and a second light-guiding member which includes a resin material, and transmits the secondary light transmitted by the first light-guiding member, and the first light-guiding member and the second light-guiding member are connected by a connector, the connector including a numerical aperture (NA) converting member that optically connects a transmission path in the first light-guiding member and a transmission path in the second light-guiding member.

Abstract: A light-emitting device includes: a laser light source that radiates primary light; a wavelength converting member that emits secondary light, the secondary light including wavelength-converted light, the wavelength-converted light being the primary light converted into light having more long-wavelength components than the primary light; a first light-guiding member that transmits the secondary light; and a second light-guiding member that transmits the secondary light, and in the light-emitting device, an exit face of the first light-guiding member and an entrance face of the second light-guiding member are in direct contact with each other, and each of a residual stress in the exit face of the first light-guiding member and a residual stress in the entrance face of the second light-guiding member decreases with distance from a center of an interface between the exit face of the first light-guiding member and the entrance face of the second light-guiding member.