Abstract: An optical transmitter module includes a semiconductor laser for outputting forward outgoing light and backward outgoing light, a temperature control device for controlling a temperature of the semiconductor laser, a beam splitter plate for receiving incidence of the backward outgoing light and outputting split light, which is reflected part of the backward outgoing light and transmitted light, which is part of the backward outgoing light, a first photoelectric conversion element for converting the split light into an electric signal. The beam splitter plate includes an anti-stray-light structure for preventing the transmitted light reflected by an incident surface of a wavelength filter from entering the first photoelectric conversion element through a side end surface portion of the beam splitter plate.

Abstract: An optical transmitter module includes a semiconductor laser for outputting forward outgoing light and backward outgoing light, a temperature control device for controlling a temperature of the semiconductor laser, a beam splitter plate for receiving incidence of the backward outgoing light and outputting split light, which is reflected part of the backward outgoing light and transmitted light, which is part of the backward outgoing light, a first photoelectric conversion element for converting the split light into an electric signal. The beam splitter plate includes an anti-stray-light structure for preventing the transmitted light reflected by an incident surface of a wavelength filter from entering the first photoelectric conversion element through a side end surface portion of the beam splitter plate.

Abstract: A unit for stabilizing a wavelength of a light, includes (a) a first light-receiver directly receiving a part of laser beams irradiated from a semiconductor laser, (b) a wavelength-filter directly receiving a part of the laser beams, and having a transmittance varying in accordance with a wavelength of the received laser beams, and (c) a second light-receiver receiving laser beams having passed through the wavelength-filter, wherein the first light-receiver has a first edge, and the second light-receiver has a second edge located in the vicinity of the first edge, and the first edge has a first linear portion and the second edge has a second linear portion extending in parallel with the first linear portion.

Abstract: A vacuum cleaner having a vacuum cleaner main body, an electric blower motor provided in the vacuum cleaner main body, a dust collection part provided in the vacuum cleaner main body, a suction nozzle body for communicating with the dust collection part, an impeller having a rotary axis provided in an interior portion of the suction nozzle body and driven by a suction force which is generated by said electric blower motor. At least one of a rotation brush member and a rotation blade member is included in the suction nozzle body and an opening portion of the suction nozzle body is opposed to a surface to be subjected to cleaning, a suction inlet port for the suction nozzle body is provided for sucking air from an outside portion and is located separately from the opening portion of the suction nozzle body.

Abstract: At an interior portion of a suction nozzle body, an impeller and a brush member are installed. The impeller is rotated in response to an air flow produced by a suction force and a brush or a blade member is mounted in a spiral shape along the whole impeller or a part of the impeller and contacts a surface to be subjected to cleaning. The rotary brush rotates integrally with the impeller on the same shaft and no partition wall is provided between the impeller and the rotary brush. A suction nozzle body having a small size, and which is of light weight and provides for silent operation, and a vacuum cleaner using the same, can be provided.