Abstract: An endoscope light source device includes a plurality of first semiconductor light sources that emit pieces of light in wavelength ranges different from each other, an illumination light generation unit that generates white light as illumination light by using the pieces of light emitted from the plurality of first semiconductor light sources, and at least one light source attachment unit that is configured such that a second semiconductor light source is attachable to and detachable from the light source attachment unit, in which the illumination light generation unit generates the illumination light by using the pieces of light emitted from the plurality of first semiconductor light sources and light emitted from the second semiconductor light source in a case where the second semiconductor light source is attached to the light source attachment unit.

Abstract: An endoscope system includes an imaging sensor that images a sutured portion, a display device, and a processor configured to generate an oxygen saturation image imaging an oxygen saturation of the sutured portion based on image information obtained by the imaging sensor, determine a fusion state of the sutured portion, and display the oxygen saturation image and a determination result obtained by determining the fusion state of the sutured portion.

Abstract: Provided is an illumination optical system for endoscope having high light utilization efficiency. The illumination optical system for endoscope which is provided in contact with an end surface of a light guide at a distal end portion of an insertion part of an endoscope, includes a diffusion plate that is provided on the end surface of the light guide and that diffuses light from the light guide, in which the diffusion plate has a diffusion surface that is formed on a surface on a side of the light guide and a light guide unit that guides light diffused on the diffusion surface, the diffusion surface consists of a holographic diffusion plate, and the light guide unit consists of sapphire glass.

Abstract: A fluorescent type of green light source of a semiconductor in a light source apparatus for an endoscope includes a blue excitation light source device and green emitting phosphor. The blue excitation light source device emits blue excitation light. The green emitting phosphor is excited by the blue excitation light, and emits green fluorescence. A dichroic filter in a dichroic mirror cuts off the blue excitation light from an emission spectrum of mixed light of the blue excitation light and green fluorescence from the fluorescent type of green light source. Thus, illumination light with the emission spectrum of a target can be stably supplied without influence of the blue excitation light to a light amount of blue light from a blue light source of a semiconductor.

Abstract: There is provided an endoscope system capable of maintaining a constant light amount ratio for each wavelength of light emitted from an endoscope. The endoscope system has: an endoscope that has a light guide; two or more light sources that supply light to the light guide and have different main wavelengths; a light source driving unit that supplies a driving signal to each of the light sources; a light source control unit that makes the light source driving unit generate a driving signal corresponding to the light amount setting value; and a light source information storage unit that stores information of the main wavelength. The endoscope has a scope information storage unit that stores information of a scope type.

Abstract: The light source device for an endoscope includes a plurality of light sources that emits light with different wavelengths, a light path integration part that integrates light paths of the light, a light path unit on which the integrated light is incident, a photodetector that receives a portion of the light until the light paths are integrated by the light path integration part to obtain information on a light quantity, and a light source controller that adjusts the light quantity of the light based on a light quantity measurement signal generated by the photodetector. The light path unit includes a light guide part that has a homogenizing function to receive the integrated light from the light path integration part, and a light collecting part that collects light passing through the light guide part.

Abstract: An endoscope system includes an imaging sensor that images a sutured portion, a display device, and a processor configured to generate an oxygen saturation image imaging an oxygen saturation of the sutured portion based on image information obtained by the imaging sensor, determine a fusion state of the sutured portion, and display the oxygen saturation image and a determination result obtained by determining the fusion state of the sutured portion.

Abstract: The invention provides an endoscope system for generating an oxygen saturation image that can be used for various medical applications, such as oxygen saturation monitoring during surgery. A clip 141 is attached to the surrounding tissue of a tumor CN from the luminal side. The tissue to which the clip 141 is attached becomes an ischemic part CL. An oxygen saturation image is generated from image information obtained by imaging the tissue on the abdominal cavity side. In the oxygen saturation image, the ischemic part CL is displayed as a low oxygen region. Accordingly, it becomes easy to find the location of the tumor CN even from the abdominal cavity side.

Abstract: There are provided an endoscope that has sufficient air-tightness and excellent durability and an endoscope in which a reduction in the amount of light is suppressed. An endoscope includes: a light guide that emits incident light from an end portion thereof; a distal end member that is provided at the end portion of the light guide, has a function to propagate the light emitted from the light guide by total reflection, and propagates the light emitted from the light guide and emits the light from a distal end face thereof; and an imaging unit that uses the light emitted from the distal end member to image an object to be observed. The distal end member includes a light guide member made of glass.

Abstract: Provided is an endoscope system that maintains the hue of an endoscopic image even in a case where a wavelength shift occurs in light for observation. An endoscope system includes a light source unit including at least one first light source that emits light including two color components with mutually different wavelengths; an image sensor having at least a first element part that has a spectral sensitivity for a first color component and a second element part that has a spectral sensitivity for the second color component out of the two color components of the first light source; and a processor that images an observation object using the light emitted from the at least one first light source of the light source unit and obtains a first signal value of the first color component obtained in the first element part of the image sensor, and a second signal value of the second color component obtained in the second element part.

Abstract: The light source device for an endoscope includes a plurality of light sources that emits light with different wavelengths, a light path integration part that integrates light paths of the light, a light path unit on which the integrated light is incident, a photodetector that receives a portion of the light until the light paths are integrated by the light path integration part to obtain information on a light quantity, and a light source controller that adjusts the light quantity of the light based on a light quantity measurement signal generated by the photodetector. The light path unit includes a light guide part that has a homogenizing function to receive the integrated light from the light path integration part, and a light collecting part that collects light passing through the light guide part.

Abstract: There are provided a light source device, which is more compact and inexpensive than a known light source device, and an endoscope system having a compact and inexpensive light source device. In a light source device, a light source unit includes a first light source that emits blue light, a second light source that emits broadband green light including not only a green component but also a red component, and an optical filter that adjusts the amount of broadband green light for each wavelength. The optical filter has a characteristic in which the reflectance of the green component is smaller than the reflectance of the red component in the case of reflecting the broadband green light or a characteristic in which the transmittance of the green component is smaller than the transmittance of the red component in the case of transmitting the broadband green light.

Abstract: A band limiter comprises an optical filter, which has first and second filter sections, and a filter moving mechanism for moving the optical filter to place the first or second filter section in a light path of blue light. A passband where transmittance of the first filter section is greater than or equal to half a peak value thereof is defined as a first transmission band. The first transmission band includes a peak wavelength, at which an absorption coefficient of hemoglobin is at its peak. A passband where transmittance of the second filter section is greater than or equal to half a peak value thereof is defined as a second transmission band. The second transmission band does not include an isosbestic wavelength (in the order of 450 nm), at which an absorption coefficient of oxyhemoglobin equals or crosses an absorption coefficient of deoxyhemoglobin.

Abstract: A band limiter comprises an optical filter, which has first and second filter sections, and a filter moving mechanism for moving the optical filter. The first filter section reduces intensity of blue light, which is emitted from a B-LED, in a wavelength range of greater than or equal to a peak wavelength of the blue light to generate first blue light. The second filter section reduces intensity of the blue light in a wavelength range of less than or equal to the peak wavelength of the blue light to generate second blue light. A light source controller places the first filter section in a light path of the blue light in a normal mode to generate the first blue light, and places the second filter section in the light path of the blue light in an oxygen saturation mode to generate the second blue light.

Abstract: Provided is an endoscope system that maintains the hue of an endoscopic image even in a case where a wavelength shift occurs in light for observation. An endoscope system includes a light source unit including at least one first light source that emits light including two color components with mutually different wavelengths; an image sensor having at least a first element part that has a spectral sensitivity for a first color component and a second element part that has a spectral sensitivity for the second color component out of the two color components of the first light source; and a processor that images an observation object using the light emitted from the at least one first light source of the light source unit and obtains a first signal value of the first color component obtained in the first element part of the image sensor, and a second signal value of the second color component obtained in the second element part.

Abstract: There is provided an endoscope system capable of maintaining a constant light amount ratio for each wavelength of light emitted from an endoscope. The endoscope system has: an endoscope that has a light guide; two or more light sources that supply light to the light guide and have different main wavelengths; a light source driving unit that supplies a driving signal to each of the light sources; a light source control unit that makes the light source driving unit generate a driving signal corresponding to the light amount setting value; and a light source information storage unit that stores information of the main wavelength. The endoscope has a scope information storage unit that stores information of a scope type.

Abstract: A fluorescent type of green light source of a semiconductor in a light source apparatus for an endoscope includes a blue excitation light source device and green emitting phosphor. The blue excitation light source device emits blue excitation light. The green emitting phosphor is excited by the blue excitation light, and emits green fluorescence. A dichroic filter in a dichroic mirror cuts off the blue excitation light from an emission spectrum of mixed light of the blue excitation light and green fluorescence from the fluorescent type of green light source. Thus, illumination light with the emission spectrum of a target can be stably supplied without influence of the blue excitation light to a light amount of blue light from a blue light source of a semiconductor.

Abstract: The invention provides an endoscope system for the early detection of suture failure. Parts of the large intestine separated by the resection of a tumor are sutured by using a suturing member 167. A sutured portion is imaged. An oxygen saturation image 180 is generated by imaging the oxygen saturation of the sutured portion based on image information obtained by the imaging. The generated oxygen saturation image 180 is displayed on a display device 14. In the case of suture failure, a low oxygen region 180a is displayed in the oxygen saturation image.

Abstract: An endoscope system includes a light source unit, a band limiting unit, a light source control unit, an imaging sensor, an imaging control unit, and an oxygen saturation image generation unit. The light source unit includes a V-LED that emits violet light, a B-LED that emits blue light, a G-LED that emits green light, and an R-LED that emits red light. The band limiting unit generates measurement light having a specific wavelength band for measuring the oxygen saturation from the blue light. The light source control unit switches the control of the light source unit between a first light emission mode, in which the observation target is irradiated with the violet light, the measurement light, the green light, and the red light, and a second light emission mode, in which the observation target is irradiated with the measurement light.

Abstract: There are provided a light source device, which is more compact and inexpensive than a known light source device, and an endoscope system having a compact and inexpensive light source device. In a light source device, a light source unit includes a first light source that emits blue light, a second light source that emits broadband green light including not only a green component but also a red component, and an optical filter that adjusts the amount of broadband green light for each wavelength. The optical filter has a characteristic in which the reflectance of the green component is smaller than the reflectance of the red component in the case of reflecting the broadband green light or a characteristic in which the transmittance of the green component is smaller than the transmittance of the red component in the case of transmitting the broadband green light.