Abstract: A method for fault location is provided which can accurately perform a fault location process by a simple and direct calculation without requiring no synchronization of terminals. Data relating to the voltage and the current (vector quantity) at opposite ends of a power transmission line section to be located and a transmission line constant set in advance are used. When the distance x from a designated terminal A to a fault point F is an unknown quantity, the distance x can be calculated by solving a quadratic equation obtained by taking as the fault point a point where values of the second power of a fault point voltage in a fault phase when viewed from opposite ends of the section to be located are equal to each other.

Abstract: Provided is a high-precision and highly functional digital protective relay device and a data transmission device for a digital protective relay device, by enabling transmission of large amounts of system electrical quantity data. The data transmission device for a digital protective relay device, the transmission device comprising: an analog/digital conversion portion 6, which, after sampling a system electrical quantity signal acquired from an electric power system at m times the fundamental frequency f0 (m>12) thereof, performs conversion into n-bit digital data (n>12); a data processing portion 7, which converts m sampling data of n bits with frequency m·f0, obtained by the analog/digital conversion portion, into k sampling data with frequency k·f0 (k?m) at or below the former frequency; and a transmitting portion 8, which transmits k sampling data obtained by the data processing portion to another protective relay device in a prescribed transmission format.

Abstract: The present invention provides a wide area protection control measurement system and method which excels in economy, reliability and expandability, in which applied arithmetic operation functions for protection, control and measurement can be freely added and changed, without adding or changing power monitoring terminals to be installed in the electric-supply station. The wide area protection control measurement system is configured from N number of power monitoring terminals 1 installed in an electric-supply station in a target range, one electric quantity aggregation device 3 connected with these power monitoring terminals 1 via a communication network 2, and M number of applied arithmetic operation devices 4 connected with the electric aggregation device 3 through an inter-device connection. Each power monitoring terminal 1 transmits electric quantity data to the electric quantity aggregation device 3 via the communication network 2.

Abstract: The present invention provides a wide area protection control measurement system and method which excels in economy, reliability and expandability, in which applied arithmetic operation functions for protection, control and measurement can be freely added and changed, without adding or changing power monitoring terminals to be installed in the electric-supply station. The wide area protection control measurement system is configured from N number of power monitoring terminals 1 installed in an electric-supply station in a target range, one electric quantity aggregation device 3 connected with these power monitoring terminals 1 via a communication network 2, and M number of applied arithmetic operation devices 4 connected with the electric aggregation device 3 through an inter-device connection. Each power monitoring terminal 1 transmits electric quantity data to the electric quantity aggregation device 3 via the communication network 2.

Abstract: In a speaker having a magnet circuit causing vibrations of a diaphragm and attached to and supported on a frame, a plurality of projections is formed on a bottom portion of the frame supporting the magnetic circuit. The projections are in point contact with a rear-facing face of a flange of a yoke partially forming the magnetic circuit in order for the magnetic circuit to be supported on the speaker frame.

Abstract: A circuit board includes: a substrate; a conductive pattern disposed on a surface of the substrate; a lower insulation layer disposed on the conductive pattern to cover the conductive pattern except for an opening, through which the conductive pattern is partially exposed from the lower insulation layer; a conductor disposed on the lower insulation layer and connecting to the conductive pattern through the opening; an upper insulation layer disposed on the conductor for covering the conductor and the lower insulation layer; and a test coupon disposed on the substrate for evaluating the conductor.

Abstract: A coupled body of a speaker apparatus having a frame and a vibration unit, the coupled body including a disk which is connected in its inner periphery on a side of the vibration unit and connected in its outer periphery on a side of the frame, the disk having a plurality of corrugations like concentric circles, wherein a first corrugation in the vicinity of the vibration unit is formed to be higher than the plurality of second corrugations other than the first corrugation, and the second corrugations are formed to have identical heights.

Abstract: A voice coil bobbin, which transmits a motive force from the voice coil wound around the bobbin to a diaphragm, includes a main part, a reinforcement part formed on the surface side of the main part, and a middle part formed between the main part and the reinforcement part and made of a material which has a lower density than the other two parts, preferably a non-woven cloth. Thus, there can be provided with the simple-design, high-rigidity voice coil bobbin with high internal loss and a speaker system capable of high-quality sound reproduction.

Abstract: A multiple-bolt insertion tool in accordance with the present invention simultaneously inserts bolts into at least two bolt holes arrayed in a workpiece and includes a bolt receiving member and a hold-and-release mechanism. The bolt receiving member includes bolt positioning portions which establish a positional relationship among the bolts that are to be inserted that matches the positional relationship of the bolt holes, and a tool positioning portion, which fits (mates with) the workpiece to locate the bolt positioning portions in alignment with corresponding bolt holes in the workpiece. The hold-and-release mechanism holds the bolts in the bolt positioning portions until the tool positioning portion is mated with the workpiece and can release the bolts from the bolt positioning portions.

Abstract: A multiple-bolt insertion tool in accordance with the present invention simultaneously inserts bolts into at least two bolt holes arrayed in a workpiece and includes a bolt receiving member and a hold-and-release mechanism. The bolt receiving member includes bolt positioning portions which establish a positional relationship among the bolts that are to be inserted that matches the positional relationship of the bolt holes, and a tool positioning portion, which fits (mates with) the workpiece to locate the bolt positioning portions in alignment with corresponding bolt holes in the workpiece. The hold-and-release mechanism holds the bolts in the bolt positioning portions until the tool positioning portion is mated with the workpiece and can release the bolts from the bolt positioning portions.

Abstract: A wound coil assembling jig is used to determine the length of a lead wire disposed at an end of a wound coil disposed on a stator core, and comprises a base plate and a holding device. The base plate has a mounting face mounted to an end of the stator core in an axial direction, a positioning device that positions the base plate with respect to the stator core in a circumferential direction, and an insertion opening which can receive a coil end portion, which is a portion of the wound coil protruding from the end of the stator core in the axial direction. The holding device is disposed at an outer face of the base plate, and holds the lead wire at the wound coil.

Abstract: In a speaker device 10 having: a magnetic circuit 13 including a magnet 14 and a yoke 11; a voice coil 16 which is placed in a magnetic gap 12 of the magnetic circuit 13; and a diaphragm 17 which is vibrating available in a state where the diaphragm is coupled with the voice coil 16, a peripheral edge of the diaphragm 17 being fixed to a housing 20, a damper holder 30 is disposed in a portion where a damper 27 is attached to the housing 20. The damper holder 30 is in point contact with the housing 20 via three or more projections 31 which are disposed on one of the damper holder 30 and the housing 20. Preferably, the damper holder 30 is made of a hybrid material of a resin (polypropylene) and tungsten, and has a specific gravity of 10.0 or larger.

Abstract: For providing a damping system to supply good sound characteristics of a speaker, the damping system includes an inner panel, a speaker and a damping device. The inner panel is vibrated by the speaker. The inner panel is provided on a surface thereof with a mounting portion of the damping device. The damping device has an elastic member and a mass. The elastic member is mounted at the mounting portion. The mass is mounted on the elastic member. When the mass vibrates against the elastic member, natural frequency of the damping device is equal to natural frequency of the mounting portion.

Abstract: A speaker includes a speaker unit, a case, and a vibration absorber. The case includes an outer case for enclosing the speaker unit. The outer case is formed of a closed end tube, having an outer bottom plate and an outer cylindrical wall extending from a periphery of the outer bottom plate. The vibration absorber is attached to the outer bottom plate. The vibration absorber includes an elastic member attached to the outer bottom plate, and a weight attached to the elastic member.

Abstract: In a speaker having a magnet circuit causing vibrations of a diaphragm and attached to and supported on a frame, a plurality of projections is formed on a bottom portion of the frame supporting the magnetic circuit. The projections are in point contact with a rear-facing face of a flange of a yoke partially forming the magnetic circuit in order for the magnetic circuit to be supported on the speaker frame.

Abstract: A circuit board includes: a substrate; a conductive pattern disposed on a surface of the substrate; a lower insulation layer disposed on the conductive pattern to cover the conductive pattern except for an opening, through which the conductive pattern is partially exposed from the lower insulation layer; a conductor disposed on the lower insulation layer and connecting to the conductive pattern through the opening; an upper insulation layer disposed on the conductor for covering the conductor and the lower insulation layer; and a test coupon disposed on the substrate for evaluating the conductor.

Abstract: In a focusing state determining device for determining a focusing state of a taking lens, an object light entering the taking lens is captured by focusing state determination imaging elements provided separately from a video imaging element, and the focusing state is determined according to luminance signals outputted from the focusing state determination imaging elements. Any error of determination of the focusing state induced by saturation of the luminance signals in imaging an object of high luminance is prevented by adjusting the gains of the image signals outputted from the focusing state determination imaging elements or the charge accumulation times of the focusing state determination imaging elements. High-frequency components are determined from the luminance signals obtained from the focusing state determination imaging elements (A, B, C), and the focus evaluation value is determined by integration thereof.

Abstract: A beam splitter (24)for splitting light in a wavelength range of about 500 nm to about 600 nm is arranged in a relay optical system of a taking lens (12). A green light beam reflected from the beam splitter (24) is directed through a relay lens (R3) to a focusing state determination imaging unit (26). The imaging unit (26) comprises three imaging elements (A, B, C) for capturing the directed green light beam to determine the focusing state. Thus, a device for determining the focusing state of the taking lens is provided, in which the green light beam is separated as an object light for determining the focusing state from the object light entering the taking lens (12), so that the focusing state can be determined with high accuracy on the basis of the high-frequency components of the image signal generated by capturing the green light beam by means of the imaging elements (A, B, C) having different optical path lengths.

Abstract: A speaker capable to playback in wide frequency range by means of reducing peak values of amplitude of resonance frequencies in frequency characteristics is provided by means of differing a radius of curvature R1 of an inner diaphragm 10a and a radius of curvature R2 of an outer diaphragm 10b to differ resonance frequencies of the inner diaphragm 10a and the outer diaphragm 10b. Furthermore, by means of equalizing an area S1 of the inner diaphragm 10a and an area S2 of the outer diaphragm 10b, sound pressure levels of the inner and outer diaphragms 10a, 10b are equalized with each other.

Abstract: A beam splitter (24) for splitting light in a wavelength range of about 500 nm to about 600 nm is arranged in a relay optical system of a taking lens (12). A green light beam reflected from the beam splitter (24) is directed through a relay lens (R3) to a focusing state determination imaging unit (26). The imaging unit (26) comprises three imaging elements (A, B, C) for capturing the directed green light beam to determine the focusing state. Thus, a device for determining the focusing state of the taking lens is provided, in which the green light beam is separated as an object light for determining the focusing state from the object light entering the taking lens (12), so that the focusing state can be determined with high accuracy on the basis of the high-frequency components of the image signal generated by capturing the green light beam by means of the imaging elements (A, B, C) having different optical path lengths.