Abstract: A cutting machine of the present invention for cutting a material to be cut, which is placed on a table, with a rotating saw blade, includes an imaging device, a determination device and a stopping device. The imaging device takes a video image of an area on the table and outputs the video image. The determination device makes a determination on whether or not a number of pixels of a specific color, which is previously set, exceeds a predetermined threshold in one frame of image constituting the video image outputted from the imaging device. The stopping device stops rotation of the saw blade when it is determined by the determination device that the number of pixels of the specific color exceeds the predetermined threshold.

Abstract: A cutting machine of the present invention for cutting a material to be cut, which is placed on a table, with a rotating saw blade, includes an imaging device, a determination device and a stopping device. The imaging device takes a video image of an area on the table and outputs the video image. The determination device makes a determination on whether or not a number of pixels of a specific color, which is previously set, exceeds a predetermined threshold in one frame of image constituting the video image outputted from the imaging device. The stopping device stops rotation of the saw blade when it is determined by the determination device that the number of pixels of the specific color exceeds the predetermined threshold.

Abstract: The claimed invention provides an ultrasonic welding method, whereupon joint portions in which a copper foil portion and a twisted-wire electric cable are placed one upon the other in each groove of a resin casing, the grooves having a through-hole portion. In the through-hole portion, the copper foil portion and the twisted-wire electric cable are placed one upon the other. Welding is performed in a state in which the piled-up portion is sandwiched between a welding tip formed at an end of a welding head and an anvil. Thus, the joint portion between the copper foil portion and the twisted-wire electric cable invade and are invaded by a portion of the resin casing softened by welding heat. The joint portion is fastened not only by welding, but also by the solidified resin.

Abstract: A semiconductor laser device in which a housing with an optical fiber inserted in is secured to a header with a semiconductor laser chip mounted on is integrated, the light emitting surface of the semiconductor laser chip and the end surface of the optical fiber are opposed to each other, and there is provided a photodiode chip for detecting the signal light emitted from the backside (rear end surface) of the light emitting surface of the semiconductor laser chip, in the top incidence type photodiode chip having a pn junction area of the structure as a photo-sensing region, the first region is surrounded by a second region of the second conductivity type formed at a portion of the semiconductor layer. The second region has the same or larger depth as or than that of the first region. Thus, even if a light is directed to the outside of the photo-sensing region, extra charges into the photo-sensing region is prevented.

Abstract: An infrared light transmission fiber comprising an optical fiber made of an infrared light transmitting material which is covered with a reinforcing layer formed by impregnating glass fibers with a thermosetting varnish and curing the same is disclosed. The optical fiber may have a primary coating of cured thermosetting resin provided on the optical fiber and/or a coating of an elastic material provided on the reinforcing layer.

Abstract: An infrared light transmitting fiber is disclosed. The fiber is prepared by hot extruding an alkali metal halide, silver halide or thallium halide crystal containing an alkaline earth metal element.

Abstract: This invention relates to an infrared fiber excellent in elongation as well as tensile strength and yield strength, which comprises a mixed crystal containing 0.01 to 10% by weight of silver chloride in silver bromide or a mixed crystal containing 0.01 to 10% by weight of silver bromide in silver chloride.

Abstract: An infrared fiber is obtained in which a core crystal fiber for transmitting infrared rays is inserted in a cladding crystal pipe having a smaller refractive index than the core crystal fiber and in which the interface between the core and pipe is held smooth. This infrared fiber can effectively be prepared by inserting a core crystal fiber in a cladding crystal pipe and then subjecting the inserted pipe to a drawing working through a die.

Abstract: An infrared light transmitting optical fiber and a process for producing the same are disclosed. The infrared light transmitting optical fiber is produced by a process comprising preparing a core crystalline fiber having a high melting point and a high refractive index, forming around the core fiber a continuous layer of cladding crystal having a low melting point and a low refractive index, and subsequently forming a protective layer on the resulting step-index fiber.

Abstract: A process is disclosed for producing an infrared light transmitting optical fiber by drawing a rod of single crystal or polycrystalline metal halide into a fiber through a die; also disclosed is a process for producing an infrared light transmitting optical fiber of step-index type by forming around a single crystal or polycrystalline fiber core, an intimate cladding crystal layer having a lower refractive index than the core by working in the temperature range that does not cause recrystallization of the core or cladding during working.

Abstract: This invention relates to an infrared fiber excellent in elongation as well as tensile strength and yield strength, which comprises a mixed crystal containing 0.01 to 10% by weight of silver chloride in silver bromide or a mixed crystal containing 0.01 to 10% by weight of silver bromide in silver chloride.

Abstract: A process for continuous production of porous metal in a tape form is disclosed which comprises the steps of treating a non-conductive porous tape to give its skelton surface electrical conductivity and then moving the porous tape in an electrolytic bath in close contact with a moving cathode immersed in said bath to electroplate it to a predetermined thickness.