Nec Corporation

Canon Kabushiki Kaisha

Mitsumi Electric Company Ltd.

Other

Akebono Brake Industry Co., Ltd.

Nec Casio Mobile Communications, Ltd.

Lenovo Innovations Limited (hong Kong)

Akebono Research and Developement Centre Ltd.

Yukio Murata

Jun Kuroda

Yasuharu Onishi

Motoyoshi Komoda

Yuichiro Kishinami

Shigeo Satou

Nobuhiro Kawashima

Tatsuya Uchikawa

Yasuhiro Sasaki

Hiroki Matsuda

Ukyo Mori

Masatake Takahashi

Katsutoshi Hisada

Shigeki Sakurai

Satoshi Arima

Ukyou Mori

Tatsuo Okano

Takehiro Yoshida

Kazuhiro Yoshikawa

Shigeo Miura

Yukio Yokoyama

Satoshi Hosokawa

Daisuke Suga

Shigeki Shinoda

Shigeo Sato

Nozomi Toki

Hideki Ueda

Shunichi Fujise

Junichiro Mataga

Yutaka Tomiyori

Yoshio Yoshiura

Naoki Hirasawa

Naoto Kagami

Takumi Hyugaji

Takahiro Kiyohara

Nobuaki Kokubu

Hidetoshi Tanno

Daisuke Imade

Takashi Okubo

Yasuharu Oonishi

Hajime Yamada

Yasuharu Ohnishi

Nobuaki Kokuba

Hisaharu Oki

Harumi Naruse

Haruyasu Minami

Mikio Iryo

Takayuki Sindo

An insulated power supply apparatus includes: a transformer; a switching element connected in series with a primary-side winding of the transformer; an active clamp circuit connected between terminals of the winding; and a semiconductor device for power supply control that controls the switching element and the active clamp circuit. A current-to-voltage converter element is connected in series with the switching element. The semiconductor device includes: a circuit that generates a timing to turn off the switching element based on a voltage obtained by conversion by the converter element and a predetermined turn-off threshold level; a circuit that performs ON/OFF control of the switching element in a burst mode at a predetermined load or less; and a circuit that, in the burst mode, changes a burst frequency to be lower as a load current is smaller with the number of switching times of the switching element in one burst cycle fixed.

Insulated power supply apparatus and semiconductor device for power supply control

Rice-bran oil of superior quality can be obtained from rice bran in high yields, and defatted rice bran of superior quality can be obtained as well. The process of the invention comprises a first processing step of bringing overheated steam in contact with fresh rice bran obtained just after rice polishing to deactivate enzymes, a second processing step of extracting rice-bran oil from the rice bran obtained in the first processing step, and a third processing step of isolating and obtaining defatted rice bran. Preferably in the first processing step, overheated steam of 250&#xb0; C. to 650&#xb0; C. is brought in contact with rice bran for 0.5 to 60 seconds. The extracted rice-bran oil has a low acid number, and the obtained defatted rice bran is free of bacteria and nasty smells, providing a meal of superior edible quality.

Process and apparatus for manufacturing overheated stem processed edible rice-bran

A semiconductor device for a switching power supply includes first and second external terminals, ON and OFF timing generation circuits, and a drive pulse generation circuit. To the first and second external terminals, a feedback voltage and a voltage induced in an auxiliary winding are input, respectively. The ON and OFF timing generation circuits respectively generate timing signals turning on and off a switching element based on the voltages. The drive pulse generation circuit generates a pulse signal based on these signals. The ON timing generation circuit includes: a bottom detection circuit detecting a lowest point of the voltage of the second external terminal; and a timer circuit, and operates in a PWM mode and a quasi-resonant mode in response to a timing of an output of the timer circuit being before a timing of an output of the bottom detection circuit and the reverse case, respectively.

Semiconductor device for switching power supply and AC-DC convertor

A power controlling semiconductor device generates a drive pulse to turn on or off a switching device which applies an intermittent current to a primary side winding of a transformer in response to a voltage proportional to a present current flowing through the primary side winding of the transformer and to an output voltage detection signal from a secondary side of the transformer. The device includes a current detecting terminal and an overcurrent detecting circuit. The voltage proportional to the present current flowing through the primary side winding is applied to the current detecting terminal. The overcurrent detecting circuit compares a voltage corresponding to the voltage applied to the current detecting terminal with an upper limit current detecting voltage to detect an overcurrent. A correction current is applied to a correction resistor connected to the current detecting terminal for a shift in the voltage.

Power controlling semiconductor device, switched-mode power supply, and method of designing the device and power-supply

A semiconductor device for power supply control includes an on/off control signal generation circuit which generates a control signal to turn on or off the switching element, a high-voltage input start terminal to which alternating-current voltage of AC input or voltage rectified in a diode bridge is input, a high-voltage input monitoring circuit connected to the high-voltage input start terminal and monitoring voltage of the high-voltage input start terminal, and a discharging unit connected between the high-voltage input start terminal and a ground point. When the high-voltage input monitoring circuit detects that a time for which the voltage of the high-voltage input start terminal is not lower than a predetermined voltage value for a predetermined period, the discharging unit is turned on.

Semiconductor device for controlling power source

A semiconductor device for power supply control includes an on/off control signal generation circuit which generates a control signal for turning on or off a switching element; a current detection terminal to which voltage in proportion to a current flowing in a primary-side winding wire of a transformer is input; a pull-up unit with high impedance provided between the current detection terminal and a terminal to which an internal power supply voltage is applied; and a terminal monitoring circuit which determines that the current detection terminal is abnormal when comparing the voltage of the current detection terminal with a predetermined voltage and detecting that the voltage of the current detection terminal is higher than the predetermined voltage. When the terminal monitoring circuit detects abnormality of the current detection terminal, a signal generation of the on/off control signal generation circuit is stopped by a signal output from the terminal monitoring circuit.

Semiconductor device for power supply control

A semiconductor device for power supply control includes an over-current detection circuit which detects an over-current state on a secondary side of a transformer by comparing a voltage in proportion to current flowing in a primary-side winding wire with an over-current detection voltage; a control signal generation circuit which generates a control signal to turn off a switching element when the over-current detection circuit has detected the over-current state; and an over-current detection level generation circuit which generates the over-current detection voltage in accordance with an on-duty of a driving pulse of the switching element. The over-current detection level generation circuit is configured to generate the over-current detection voltage in accordance with: Vocp=Vint+a&#xb7;ON Duty, where Vocp represents the over-current detection voltage, ON Duty represents the on-duty, Vint represents the over-current detection voltage to be a reference, and 'a' represents a correction coefficient.

A control circuit that controls a switching element includes a first terminal to which a voltage produced by conversion of current flowing through the switching element by a current-to-voltage conversion element is input, a second terminal to which the voltage of a point of contact of an inductor and rectification element or a voltage proportional thereto is input, a filter for smoothing the voltage input into the second terminal, and a voltage comparison circuit for comparing the voltage smoothed by the filter and the voltage input into the second terminal. The control circuit performs control such that the switching element is switched from off to on near the point where the inductor current becomes zero based on the voltage comparison circuit output and the switching element is switched from on to off in response to the voltage applied to the first terminal reaching a prescribed voltage.

Non-isolated power supply device

A second housingis capable of moving in a direction in which the second housing covers one surface of a first housing. Oscillating elements of an oscillating element groupare arranged in a matrix and oscillate sound waves outward from the one surface of the first housing. A control unit controls the plurality of oscillating elements. A sound wave sensor constitutes the same matrix as the plurality of oscillating elements and detects sound waves having a specific wavelength. The detection results of the sound wave sensor are output to the control unit. A frame body holds the plurality of oscillating elements and the sound wave sensor. The control unit oscillates sensor sound waves having a specific wavelength outward from at least one of the oscillating elements. The control unit determines that the second housingcovers the one surface of the first housingwhen the sound wave sensor detects the sound waves having the specific wavelength.

Electronic apparatus and control method for electronic apparatus

An electronic apparatus () includes a first detachable speaker unit () including a first speaker having a relatively high directivity, and a second detachable speaker unit () including a second speaker having a relatively low directivity. The electronic apparatus () further includes a body unit (an electronic apparatus body ()) provided with a slot () in which any one of the first detachable speaker unit () and the second detachable speaker unit () is detachably installed therein in an alternative way, and a control unit that is provided in the body unit and controls the first and second speakers.

Electronic apparatus with detachable speakers, a body unit and a control unit

An oscillation device (electro-acoustic transducer ()) includes an oscillation element () that has a vibrating member () and a piezoelectric element () that is attached to one surface of the vibrating member (). The oscillation device includes a sheet-shaped waterproof member () that is constituted by a waterproof material. The oscillation device includes a frame-shaped supporting member () that holds an outer peripheral portion of the vibrating member () and an outer peripheral portion of the waterproof member () so that the waterproof member () and the oscillation element () face each other. The oscillation device includes a connection member () that partially connects mutual opposed surfaces of the oscillation element () and the waterproof member ().

Oscillation device and electronic apparatus

A portable terminal device has first and second casings () and a biaxial hinge () coupling the first and second casings (). The portable terminal device also has a speaker () provided in the first casing () or the biaxial hinge (), a sound emission hole (), a waveguide () guiding a sound wave to the sound emission hole (), and a display device () provided for the second casing (). A display screen () of the display device () and the sound emission hole () are disposed in a face () whose orientation changes when the second casing () turns about a second axis, in the second casing ().

Portable terminal device having sound emission hole which changes orientation based on rotation of casing about biaxial hinge

In an electro-acoustic transducerwhich is an oscillator device, center positions of principal surfaces of piezoelectric elementsthat are positioned on both surfaces of an elastic memberare different from each other. As such, since the two piezoelectric elementsare disposed asymmetrically on the upper and lower sides in the electro-acoustic transducer, it is possible to prevent vibrations of reversed phases at the time of divided vibration in which the reversed phases overlap with each other. In other words, since it is possible to prevent the generation of sound waves due to the vibration of local reversed phases, the sound pressure level can be improved.

Oscillator device and electronic apparatus

Disclosed is an electronic device including: a housing () in which at least one sound hole () and at least one sound hole () are formed; an oscillator () that is provided inside the housing () and outputs a modulated wave for a parametric loudspeaker; a sound demodulation unit () that is not provided in the sound hole () but provided in the sound hole () and demodulates the modulated wave; and a sound hole opening and closing unit () that is mounted to the housing () and opens and closes the sound hole ().

Electronic device

Provided is an oscillator () including a piezoelectric body () that has a plurality of protrusions () on one surface thereof, a plurality of electrodes () that are respectively provided on the plurality of protrusions () so as to be separated from each other, and a plurality of electrodes () that are provided on the other surface opposite to the one surface of the piezoelectric body () so that each of the electrodes faces only one electrode (). Thus, it is possible to prevent variation in acoustic characteristics from occurring. Therefore, the oscillator capable of improving the acoustic characteristics of an electronic device is provided.

Oscillator and electronic device

Growing community of inventors

Tokyo, Japan

Yukio Murata