Tdk Corporation

Taiyo Yuden Co., Ltd.

Semiconductor Energy Laboratory Co., Ltd.

Junichi Shimamura

Mamoru Sakamoto

Takeshi Nakayama

Takeshi Takahashi

Takayuki Tsukamoto

Kazuo Nishi

Hiroyuki Endo

Osamu Onitsuka

Hisao Morooka

Hideaki Ninomiya

Nobuyuki Yamazaki

Yousuke Futamata

Yoshiyuki Wasada

Yasushi Inoue

Ryoma Nakazawa

Akira Ebisawa

Mitsuaki Ootani

Hideo Kato

Kenji Kamitani

Yuji Ebinuma

Kouji Yasukawa

A dust core includes a metal magnetic material, a resin, an insulation film, and an intermediate layer. The insulation film covers the metal magnetic material. The intermediate layer exists between the insulation film and the metal magnetic material and contacts therebetween. The metal magnetic material includes 85 to 99.5 wt % of Fe, 0.5 to 10 wt % of Si, and 0 to 5 wt % of other elements, with respect to 100 wt % of the entire metal magnetic material. The intermediate layer includes a Fe&#x2014;Si&#x2014;O based oxide. The insulation film includes a Si&#x2014;O based oxide.

Dust core

The present invention provides a substrate holding method capable of contributing to improvement in performance of an electronic part. A plastic film is adhered to a holding frame by using an adhesive tape having a proper gas releasing characteristic such that total quantity of gas detected when analysis using gas chromatograph mass spectrometry (dynamic HS-GC-MS) is conducted under test conditions of 180&#xb0; C. and 10 minutes is 100.5 &#x3bc;g/g or less in n-tetradecane. In the case where the plastic film held by the holding frame is subjected to a process of manufacturing an electronic part (for example, a solar battery), even when a process accompanying generation of heat during the manufacturing process (for example, a film forming process such as plasma CVD) is performed on the plastic film, a release amount of unnecessary gas released from the adhesive tape due to the influence of the heat is suppressed, so that deterioration in the performance of the electronic part caused by the unnecessary gas is suppressed.

Method of manufacturing electronic part

The present invention provides a switching circuit and an electronic switching component having a switching semiconductor device to perform switching between a conducting state and a non-conducting state of a conducting path to thereby reduce the power loss thereof and a control method thereof. In the present invention, at least two FETs and wherein the FET has a faster switching time and the FET has a lower ON resistance. Active terminals (drains and sources) of the FETs and are connected to each other in parallel. By employing these FETs and the conversion between an ON-state and an OFF-state of the conducting path is performed. In converting from the non-conducting state to the conducting state, the control circuit first turns on the FET and then turns on the FET when if a voltage between terminals of the FET reaches around a saturation value thereof. In converting from the conducting state to the non-conducting state, the control circuit first turns off the FET and then turns off the FET when if a voltage between terminals of the FET reaches around a saturation value thereof.

Switching circuit having a switching semiconductor device and control method thereof

It is an object of the present invention to provide a method and an apparatus for driving a piezoelectric transformer capable of always driving with maximum conversion efficiency regardless of changes in the input voltage level, load and temperature, etc. The method and apparatus for driving a piezoelectric transformer of the present invention generate a time-varying sweep voltage through a sweep circuit at predetermined regular intervals, thereby changing the frequency of a drive signal output from a voltage control oscillator, at this time detect a phase difference between the voltage and current generated on the primary side of the piezoelectric transformer by a phase difference detector, and hold the sweep voltage corresponding to the timing at which a maximum value detector detects the maximum value by a sample-and-hold circuit, thereby controlling the frequency of the drive signal so that the phase difference between the voltage and current on the primary side of the piezoelectric transformer always becomes a maximum value.

Method and apparatus for driving piezoelectric transformer

An organic EL device comprises a substrate, an organic EL structure stacked on the substrate, a sealing plate located on the organic EL structure with a predetermined space therebetween, and a sealing adhesive agent for fixing the sealing plate on the substrate and thereby closing up the organic EL structure. The sealing adhesive agent is a photo-curing type adhesive agent which, upon photo-curing, generates gases under heating conditions of 85&deg; C. and 60 minutes. In these gases, the total amount of a low-molecular straight-chain aliphatic hydrocarbon which may have a substituent, an aromatic hydrocarbon which may have a substituent, an alicyclic hydrocarbon which may have a substituent, and a heterocyclic compound and a siloxane which may have a substituent is 200 &mgr;g/g or lower calculated as benzene. The organic EL device of the invention is reduced as much as possible in terms of a deterioration with time, and can maintain its initial performance over a long period of time, so that it can have an ever longer service life.

Organic electroluminescent device

A power source 1 and an operating circuit 4 incorporating a waveform generating circuit 5 for synthesizing composite wave W obtained by synthesizing a sine wave of primary oscillations and a sine wave of secondary oscillations of a Rosen-type piezoelectric transformer and an amplifying circuit 6 raises the voltage of the composite wave so that composite wave W' (having a waveform similar to that of W) is, as input voltage V.sub.in, supplied to the Rosen-type piezoelectric transformer PT. Thus, output voltage V.sub.out having greater output electric power and higher transmitting efficiencies as compared with output voltage which can be obtained from a conventional structure in which input voltage in a single oscillation mode is employed can be produced to load resistor R.sub.o.

Method of operating piezoelectric transformer and operating circuit

Growing community of inventors

Tokyo, Japan

Junichi Shimamura