Abstract: A loudspeaker including: a magnetic circuit, a voice coil, a vibration plate, a housing, and a magnetic fluid disposed between a plate and the voice coil in a magnetic gap. The magnetic circuit includes a first flow path which passes from a vibration plate side to a rear surface. The housing includes a second flow path which extends the first flow path, and a third flow path which passes through from the vibration plate side to the second flow path. A proportion of a second area to a first area matches with a proportion of an outer area to an inner area, which is an area of the vibration plate corresponding to an inner side with respect to the voice coil.

Abstract: A sound output device includes a loudspeaker including a diaphragm, a loudspeaker back space located behind the loudspeaker on a side opposite to a diaphragm, and a cable which is electrically connected to the loudspeaker and extends from the inside of the loudspeaker back space to the outside. The loudspeaker includes a diaphragm back space located in the back of the diaphragm on a side opposite to the sound radiating direction, and a sound hole having a first opening opened to the diaphragm back space and a second opening opened to the loudspeaker back space. When viewed from the first opening toward the second opening, the cable inside the loudspeaker back space is disposed outside the region of the sound hole.

Abstract: A loudspeaker (100) includes a magnetic circuit (110) having a magnetic gap (111); a voice coil body (120) disposed in the magnetic gap (111) in an inserted state; a diaphragm (130) to which the voice coil body (120) is attached; a frame (140) to which the outer circumferential, portion of the diaphragm (130) and the magnetic circuit (110) are attached; a vibration preventing member (150) including a viscoelastic body attached to the outer circumferential, portion of the diaphragm (130) in an annular shape; and a holding member (160) having an annular shape and sandwiching the outer circumferential portion of the diaphragm (130) and the vibration preventing member (150) between the frame (140) and the holding member.

Abstract: Included are a yoke, a magnet fixed to the yoke, a plate fixed to an end surface of the magnet opposite to an end surface to which the yoke is fixed, a voice coil disposed inside a magnetic gap formed by facing portions disposed in the yoke and the plate, respectively, to face each other, a vibration plate fixed to the voice coil, a holding member which holds the yoke and the vibration plate, and a magnetic fluid disposed between the facing portion of the plate and the voice coil. A coating containing a fluorine resin is formed on a surface of a portion contacting the magnetic fluid in at least one of the plate and the voice coil.

Abstract: An interconnected generator system comprises: a DC power generator means; an inverter circuit operative to convert the DC power from the DC power generator means into AC power; a current smoothing circuit including a condenser and operative to smooth the AC power converted at the inverter circuit; and a system open/close relay operative to connect the current smoothing circuit to an AC power system in an open/close-switchable manner. A bypass circuit is provided to bypass the system open/close relay to connect the current smoothing circuit to the AC power system. The bypass circuit breaks the flow through the bypass circuit when a bypass open/close relay is opened and connects the current smoothing circuit to the AC power system via a positive thermistor when the bypass open/close relay is closed.

Abstract: In a solar energy generator including a solar battery a microcomputer for controlling at least a boosting circuit and an inverter circuit so that AC power suitably usable as the AC power of a commercial power supply system can be supplied to the commercial power supply system, the power to be supplied to the various kinds of equipment of the solar energy generator is selectively supplied from one of the solar battery and the commercial power supply system. The microcomputer stores the operational status data of the solar energy generator into an external storage device, and these data can be used for maintenance or trouble shooting of the solar energy generator.

Abstract: A controlling device of a compressor is provided. A noise filter is arranged at an input of the inverter circuit that converts the commercial frequency to a driving frequency to control a motor driving a compressor mechanism, for suppressing a common mode noise of the commercial power source and the inverter circuit, and is connected to a ground through a metal frame used for receiving a compressor main body. The noise filter comprises coils connected between first capacitors and second capacitors that are connected in series between the AC power lines, and further comprises a clamper connected between nodes of the second capacitors and the metal frame for clamping a voltage and a third capacitor connected to the clamper in parallel. even though the new refrigerant, such as R410A, and the three-phase AC power source are used, the leakage current can be reduced by a simple structure and the increase of the noise terminal voltage can be also suppressed.

Abstract: A controlling device of a compressor is provided. A noise filter is arranged at an input of the inverter circuit that converts the commercial frequency to a driving frequency to control a motor driving a compressor mechanism, for suppressing a common mode noise of the commercial power source and the inverter circuit, and is connected to a ground through a metal frame used for receiving a compressor main body. The noise filter comprises coils connected between first capacitors and second capacitors that are connected in series between the AC power lines, and further comprises a clamper connected between nodes of the second capacitors and the metal frame for clamping a voltage and a third capacitor connected to the clamper in parallel. even though the new refrigerant, such as R410A, and the three-phase AC power source are used, the leakage current can be reduced by a simple structure and the increase of the noise terminal voltage can be also suppressed.

Abstract: In a solar energy generator 10 including a solar battery 11, a boosting circuit 14 for boosting DC power generated by the solar battery 11, an inverter circuit 15 for converting the DC power boosted in the boosting circuit to AC power, and a microcomputer 17 for controlling at least the boosting circuit and the inverter circuit so that AC power suitably usable as the AC power of a commercial power supply system 13 can be supplied to the commercial power supply system 13, the power to be supplied to the various kinds of equipment of the solar energy generator 10 is selectively supplied from one of the solar battery 11 and the commercial power supply system 13. The microcomputer 17 stores the operational status data of the solar energy generator 10 into an external storage device 41, and these data can be used for maintenance or trouble shooting of the solar energy generator 10.

Abstract: A method whereby a plurality of inverters for converting DC power outputted from a DC power supply, such as solar cells or fuel cells, to AC power are operated efficiently without being biased to particular inverters. The number of inverters to be run is determined in correspondence with at least one output value of the DC output or AC output, and the determined number of inverters are selected and made to run from among the plurality of inverters on the basis of a predetermined rule. In addition, a parallel-connected system is disclosed for enabling efficient and appropriate parallel-in operation by the use of inverters, with one of the inverters controlling the remaining inverters and effecting system interconnection protection.

Abstract: A power inverter for use in the system interconnection of a direct-current supply with a commercial alternating-current supply includes an inverter circuit and a filter circuit. Feedback signals affecting the frequency of an output to be produced by the inverter circuit are taken from the filter circuit having frequency response characteristics such that the phase angle is reduced to 0.degree. at three frequencies consisting of a higher frequency, lower frequency and commercial frequency, the last of which lies halfway between the first and second. Under the normal condition, the frequency of the output produced by the inverter circuit is equal to the commercial frequency. In the event of a power failure or power cut in the commercial alternating-current supply system, deviation from the commercial frequency is caused by the characteristics of the filter circuit.

Abstract: A current resonance DC-DC converter has a ZCS resonance switch circuit which comprises a semiconductor switch device 7 and a diode 8 connected together into a parallel circuit, the diode 8 being connected at its cathode to one end of a DC power supply 1, a center-tapped resonance inductance 13 adapted to produce voltages of the same polarity across the center tap and its respective opposite ends and connected at its resonance side to the anode of the diode 8, and a resonance capacitor 6 connected to the center tap of the resonance inductance 13 and to the above-mentioned one end of the power supply 1, the resonance inductance 13 being connected at a transformerside terminal thereof to one end of the primary inductance 4 of a high-frequency transformer HT, the other end of the primary inductance 4 being connected to the other end of the power supply 1.

Abstract: A power source apparatus for microwave oven includes a half-bridge converter including a series connection of switching elements, a series connection of resonance capacitors, and a high frequency transformer having a primary winding and a secondary winding, and the half-bridge converter is driven by an output of a diode bridge which receives a commercial power source of 200 V. A current transformer detects a current of the primary winding. A control circuit compares a voltage equal to an average value of the current detected by the current transformer and a voltage set by a microcomputer, and controls the switching elements at a frequency in proportion to a magnitude of a difference of the both voltages, whereby a high frequency high voltage is induced on the secondary winding and applied to a voltage doubler rectifying circuit, and then a direct current high voltage is applied to a magnetron.

Abstract: Dental materials using calcium phosphate glass-ceramics and having the color tone with high approximation to that of natural teeth. In those dental materials, calcium phosphate composite, nickel oxide and one or more other type of compounds selected from oxides of iron, manganese, cerium, titanium and tungsten, are contained as coloring component. Also, if necessary, Al.sub.2 O.sub.3 and/or SiO.sub.2 is contained as a color assisting agent in that composite. The calcium phosphate glass-ceramic according to this invention consists of the same components as that of natural teeth. Besides, it is possible to adjust the color tone delicately to match with the color tone of each individual`s teeth. Moreover, the coloring components are incorporated in crystals of calcium phosphate. Consequently, they cause no elution during use and are therefore ideal as dental material.

Abstract: Disclosed is a substance which is obtained by coating the surface of a specific iron-containing substance, through a specific procedure, with a material composed mainly of aluminum sulfate. The substance thus produced is useful as a catalyst for the removal of nitrogen oxides from an exhaust gas.