Abstract: A condition monitoring device for a wind turbine power generating apparatus provided with an auxiliary motor power supply system including a power-supply-side line connected to a power supply and a plurality of auxiliary-motor-side lines diverging from the power-supply-side line and connected to a plurality of auxiliary motors, respectively, comprises: a current measurement device for measuring a current flowing through the power-supply-side line; and a control device for controlling the plurality of auxiliary motors. The control device is configured to, when a generator of the wind turbine power generating apparatus is in a standby state where power generation is stopped at a low wind speed, execute a single sequential operation mode in which each of the plurality of auxiliary motors is singly and sequentially operated. The current measurement device is configured to measure a current flowing through the power-supply-side line during execution of the single sequential operation mode by the control device.

Abstract: A condition monitoring device for a wind turbine power generating apparatus provided with an auxiliary motor power supply system including a power-supply-side line connected to a power supply and a plurality of auxiliary-motor-side lines diverging from the power-supply-side line and connected to a plurality of auxiliary motors, respectively, comprises: a current measurement device for measuring a current flowing through the power-supply-side line; and a control device for controlling the plurality of auxiliary motors. The control device is configured to, when a generator of the wind turbine power generating apparatus is in a standby state where power generation is stopped at a low wind speed, execute a single sequential operation mode in which each of the plurality of auxiliary motors is singly and sequentially operated. The current measurement device is configured to measure a current flowing through the power-supply-side line during execution of the single sequential operation mode by the control device.

Abstract: A rotational driving apparatus with a motor, a worm pressingly fitted to an output shaft of the motor, and a worm wheel meshing with the worm, is provided to output rotation of the motor from the worm wheel via the worm. The apparatus includes support, pressing, plug, and urging members. The support member is placed forming a gap with respect to a tip end of the worm, and includes a through hole positioned on a same axis as the worm. The pressing member is inserted into the through hole, and protrudes from a tip end of the through hole to butt against a tip end face of the worm. The plug member is fitted into the through hole to close the through hole, in which its fitting degree into the through hole is adjustable. The urging member is interposed between the pressing member and the plug member to urge the pressing member toward the worm.

Abstract: A rotational driving apparatus which comprises a motor, a worm pressingly fitted to an output shaft of the motor, and a worm wheel meshing with the worm, to output rotation of the motor from the worm wheel via the worm, the apparatus comprising: a support member placed with forming a gap with respect to a tip end of the worm, the support member comprising a through hole positioned on a same axis as the worm; a pressing member that is inserted into the through hole, and protrudes from a tip end of the through hole to butt against a tip end face of the worm; a plug member fitted into the through hole to close the through hole, in which its fitting degree into the through hole is adjustable; and an urging member interposed between the pressing member and the plug member to urge the pressing member toward the worm.

Abstract: The lens barrel cover of a camera is made separately from its front cover, whereby the center positions of the lens barrel and opening of the lens barrel cover can easily be aligned with each other. Also, since the insertion opening of the front cover is disposed as being shielded with the lens barrel cover, the insertion opening is not exposed to the exterior of the camera, whereby the appearance of the camera will not be spoiled even if the insertion opening and lens barrel positionally deviate from each other. Further, since the front cover is pressed toward the main body section as the lens barrel cover is being attached, no gap is formed between the front cover and the main body section.

Abstract: A parallax correcting mechanism for a real image type viewfinder, particularly for a real image type viewfinder having a zoom function of high magnification and allowing a desired parallax correction to be easily achieved by swinging a housing for an erecting optical system relative to a housing for an objective side optical system and thereby adjusting a relative position between an optical axis of the objective side optical system and an optical axis of the erecting optical system at its incidence side. More specifically, the housing for the objective side optical system containing therein lens holders serving to hold objective lenses respectively, includes a support hole at a position thereon appropriately spaced from a common optical axis of these objective lenses.

Abstract: A real-image viewfinder for a variable-exposure camera has a mask member having a field frame for defining a field of view of the viewfinder, and a mask drive mechanism which moves the mask member between an operative position in which the mask member is positioned in an image surface of an optical system of the viewfinder so that the field frame is viewed through an eyepiece of the viewfinder and a retracted position in which the mask member is retracted from the optical path of light bundle passing through the optical system. A transparent support member having a smooth surface is disposed so that the smooth surface is positioned in the image surface of the optical system of the viewfinder and the mask member is formed of an elastic material having a flexibility. The mask drive means moves the mask member so that the mask member is brought into close contact with the smooth surface of the support member under the elasticity of the mask member itself in the operative position.