A light emitting device includes a light source configured to emit a primary light, a first phosphor that absorbs the primary light and converts the primary light into a first wavelength-converted light having a wavelength longer than that of the primary light, and a second phosphor that absorbs the primary light and converts the primary light into a second wavelength-converted light having a wavelength longer than that of the primary light. The first wavelength-converted light is a fluorescence having a light component over an entire wavelength range of 700 nm or more to 800 nm or less. The second wavelength-converted light is a fluorescence having a peak where a fluorescence intensity shows a maximum value in a wavelength range of 380 nm or more to less than 700 nm. The first wavelength-converted light has a 1/10 afterglow time longer than that of the second wavelength-converted light.

An endoscope system includes a storage medium that stores a plurality of correspondence between an imaging condition and a plurality of index values relating to a plurality of structures of an observation object, wherein the plurality of index values including a first index value acquirable under the first imaging condition and a second index value non-acquirable under the first imaging condition but acquirable under a second imaging condition, a monitor and a processor, coupled to the storage medium and the monitor. The processor is configured to: acquire an image of the observation object by using an endoscope; acquire a first imaging condition which represents an imaging condition of the image; refer to the plurality of index values and the imaging condition in the storage medium and extract the second imaging condition; and display guidance indicating that the second index value is acquirable under the extracted second imaging condition.

A wavelength converter includes a first phosphor activated with Cr.sup.3+; and a second phosphor activated with at least one ion of Ce.sup.3+ or Eu.sup.2+. A fluorescence spectrum of a fluorescence emitted by the second phosphor has a peak where a fluorescence intensity shows a maximum value in a wavelength range of 500 nm or more to less than 580 nm. The wavelength converter emits a fluorescence having a light component over an entire range of 500 nm or more to less than 580 nm. The wavelength converter emits a light having a spectrum in which a ratio of a minimum light emission intensity to a maximum light emission intensity is 40% or less in a wavelength range of 550 nm or more to 700 nm or less.

An endoscope system includes an endoscope including a control section, an insertion section, and a light guide member, a light source configured to emit light guided by the light guide member, a failure-cause detecting circuit configured to detect a pre-failure state that causes a failure of the endoscope, and a light source controller configured to control an output of the light source based on a detection result of the failure-cause detecting circuit. The failure-cause detecting circuit includes a cause predicting circuit configured to detect a second pre-failure state in which it is predicted that the endoscope reaches a first pre-failure state that directly causes the failure of the endoscope. The light source controller controls the output of the light source based on a detection result of the cause predicting circuit.

An illuminating device and an endoscope having the same are described. The illuminating device includes a light source assembly, and the light source assembly includes a first light source, a diffusion sheet and a dichroic mirror. The diffusion sheet is disposed between the first light source and the dichroic mirror, and the diffusion sheet is used to diffuse light of the first light source.

Driving an emitter to emit pulses of electromagnetic radiation according to a jitter specification in a fluorescence imaging system is described. A system includes an emitter for emitting pulses of electromagnetic radiation and an image sensor comprising a pixel array for sensing reflected electromagnetic radiation. The system includes a driver for driving emissions by the emitter according to a jitter specification. The system is such that at least a portion of the pulses of electromagnetic radiation emitted by the emitter comprises electromagnetic radiation having a wavelength from about 770 nm to about 795 nm and/or from about 795 nm to about 815 nm.

An optical endoluminal far-field microscopic imaging catheter comprises a light generating system, a first light delivery conduit for propagating light generated by the light generating system and a light distributor configured to redirect light propagated by the delivery conduit into a direction of an object to be imaged. A discriminator is configured for capturing light reflected from the object incident on a window of the discriminator from a particular direction and transmitting only the light captured from the particular direction to a second light delivery conduit. A drive mechanism is configured to sweep the window through a plurality of directions in a predictable pattern for matching each light capture event in the window with a direction of the window during the event. An analyzer matches the direction of the window with an associated light capture event and generate a visible image based on a mosaic of the captured light.

A wireless medical imaging system comprising a head unit is provided. The head unit comprises a head unit case, an integrated light source, an image sensor, a wireless transceiver, a central processing unit, and a user-input component. The head unit case has an external surface defining an external cavity, an internal surface defining an internal cavity, a first aperture, and a second aperture. The integrated light source, the image sensor, the wireless transceiver, and the central processing unit are disposed within the internal cavity. The integrated light source extends from within the internal cavity into the first aperture and is configured to transmit light from the head unit through the first aperture. The image sensor is configured to detect an image transmitted into the head unit through the second aperture. The external cavity is configured to receive an external battery. The user-input component is disposed on the external surface.

An arrangement for sterile handling of a non-sterile endoscope in a sterile environment includes a sterile endoscope sheath having an optical element arranged at its distal end, and a non-sterile endoscope. The optical element has a light-reflecting element or a light-reflecting area which reflects detection light emitted by the detection light source as reflection light toward a proximal end of the endoscope sheath. The non-sterile endoscope includes an endoscope shaft, an illumination optical system, and an observation optical system. The non-sterile endoscope is received in the endoscope sheath.

An oblique-viewing endoscope includes: an endoscope axis that is a longitudinal direction of an endoscope distal end portion; an optical axis of a lens, the optical axis being an observing direction, the endoscope axis and the optical axis being disposed to form a predetermined inclination angle with respect to each other; a rectangular semiconductor package including an imaging sensor configured to convert an optical image formed by the lens to an image signal, and a terminal formed on a back face of the semiconductor package; and a rigid substrate including a semiconductor package mounting area in which the semiconductor package is mounted, an electronic component mounting area in which an electronic component is mounted, and a cable mounting area in which a cable is mounted.