Abstract: An endoscope system includes a light source configured to generate either one of first illumination light and second illumination light, an image pickup apparatus configured to obtain an image by picking up an image of an object, and a processor. The processor is configured to make an instruction to set an observation mode of the endoscope system at either one of a first observation mode and a second observation mode, detect an observation state at a time of observing the object based on a feature value calculated from pixel values included in pixels forming a first image, and invalidate an instruction to set the observation mode of the endoscope system at the second observation mode when the observation state at the time of observing the object is not an appropriate observation state.

Abstract: An endoscope system includes a light source apparatus configured to generate first/second illumination light, an image pickup apparatus, a switching instruction device configured to be able to set one of a first observation mode in which an image obtained by image pickup of an object illuminated with the first illumination light is displayed and a second observation mode in which an image obtained by processing a color/pattern of an image obtained by image pickup of the object illuminated with the second illumination light is displayed and a processor configured to calculate a feature value indicating movement of a distal end portion of an endoscope and disable an instruction for setting the second observation mode when the feature value is equal to or higher than a predetermined threshold.

Abstract: An endoscope system includes a light source configured to generate either one of first illumination light and second illumination light, an image pickup apparatus configured to obtain an image by picking up an image of an object, and a processor. The processor is configured to make an instruction to set an observation mode of the endoscope system at either one of a first observation mode and a second observation mode, detect an observation state at a time of observing the object based on a feature value calculated from pixel values included in pixels forming a first image, and invalidate an instruction to set the observation mode of the endoscope system at the second observation mode when the observation state at the time of observing the object is not an appropriate observation state.

Abstract: A method for producing a flame-proofed fiber by performing a flame-proofing treatment on a carbon-fiber precursor fiber bundle with a heat treatment furnace including a gas supply blowout nozzle, including: a nozzle body including an inclined plate that guides a gas flowing straightly from a gas inlet port to a rectification board; and the rectification board which rectifies the flow of the gas to blow out toward a yarn from a gas outlet port, where a gas introduction direction in the nozzle is different from a gas blowing out direction, a gas guiding zone is between the inclined plate and the rectification board and includes a guide plate in a space between the gas inlet port and the rectification board and divides the gas supplied from the inlet port into two or more streams, and at least one of between the inclined plate and the guide plate or between the guide plates, an upstream passage width W1 perpendicular to a gas flowing direction inside the gas passage and any downstream passage width W2 satisfy

Abstract: The nozzle body of the gas supply blowout nozzle (11) includes an inclined plate (13) guiding a gas flowing straightly from a gas inlet port to a rectification board (12), which is connected with the nozzle body. The rectification board (12) rectifies the flow of the gas guided by the inclined plate (13) so that the gas blows out perpendicular or parallel to a yarn from a gas outlet port. A gas guiding zone formed between the inclined plate (13) and the rectification board (12) includes one or more guide plates (14) which divide the gas supplied from the gas inlet port (11a) of the gas supply blowout nozzle (11) into two or more streams. In each gas passage formed at least one of between the inclined plate (13) and the guide plate (14) or between the guide plates (14), an upstream passage width W1 and any downstream passage width W2 thereof satisfy the relation of W1?W2.

Abstract: The present invention relates to a heating furnace suitable for a step in which a precursor fiber bundle is flameproofed. The heating furnace is provided with a hot air introduction duct disposed in a horizontal space and a heat treating chamber, and in the hot air introduction duct outside the heat treatment chamber, a heating device and a circulation fan for the hot air. The interior of the heat treatment chamber comprises a fiber travel path in which the fiber bundles each having a sheet shape horizontally travels the hot air flowing in a low-temperature region is directed to the high-temperature region side by an air direction change plate to be narrowed and flow in the width direction of the hot air introduction duct As a result, the temperature distribution in the width direction in the treatment chamber can be improved.