Hitachi, Ltd.

Renesas Electronics Corporation

Samsung Sdi Co., Inc.

Hitachi Global Storage Technologies Japan, Ltd.

Other

Nanofilm Technologies International Limited

Kenji Furusawa

Mitsuya Fukazawa

Masaaki Futamoto

Yuzuru Hosoe

Yoshibumi Matsuda

Nobuyuki Inaba

Tomoo Yamamoto

Shinji Narishige

Yasutaro Uesaka

Kazusuke Yamanaka

Shinji Sasaki

Hiroyuki Kataoka

Taro Yoshida

Yuichi Kokaku

Yoshinari Murayama

Futoshi Yamane

Masami Ishikawa

Mitsutoshi Muraoka

Satoshi Matsunuma

Hiroshi Inaba

Katsuo Abe

Shigehiko Fujimaki

Makoto Kitoh

Toshio Tamura

Minoru Yamasaka

Shinya Hirano

Atsushi Amatatsu

Shi Xu

Hideaki Tanaka

Toshihiko Nakata

Masao Ito

Yoshihiro Shiroishi

Akira Kato

Masaaki Hayashi

Yoshinori Honda

Takao Nakamura

Hideaki Sasazawa

Heigo Ishihara

Norikazu Tsumita

Jiro Matsuo

Tokuho Takagaki

Takaaki Shirakura

Hideo Yamakura

Toshio Seki

Nobuya Sekiyama

Takateru Seki

Yukihiro Isono

Nobuo Nakagawa

Akio Takakura

Yuji Ochiai

Hiromu Chiba

Keiko Nakano

Shinya Matsuoka

Shigeru Ono

Minako Morisato

Naoko Uchida

Hiroaki Hagimae

Mitsuyoshi Ootake

A power conversion system includes a controller to control discharge of a smoothing condenser based on at least one signal received through an input. The at least one signal indicates a failure of a discharge circuit configured to discharge the smoothing condenser The controller controls discharge of stored charge in the smoothing condenser through parasitic resistance components of a power system which includes the smoothing condenser. The power conversion system may be used with an electric vehicle.

Electric vehicle power conversion system

A power conversion system including a DC main power supply for supplying a DC voltage, boosting circuits for performing a retrogression operation of boosting the DC voltage and comprising driving circuits, an inverter circuit for converting the DC voltage into an AC voltage, a motor/generator for receiving the AC voltage, and a control circuit for outputting a control signal to the driving circuits and stopping an operation of a faulty boosting circuit of the boosting circuits when one of the boosting circuits is faulty, for setting power control values depending on a number of remaining non-faulty boosting circuits of the boosting circuits, and for controlling the remaining non-faulty boosting circuits and the inverter circuit based on the power control values, wherein the inverter circuit and the boosting circuits perform a regeneration operation of supplying regeneration power to the DC main power supply, peripheral equipment, and/or a DC auxiliary power supply.

Power conversion system for electric vehicles

A reference voltage generating circuit including a bandgap reference circuit generating a bandgap reference voltage, and a filter circuit smoothing the bandgap reference voltage. The bandgap reference circuit is configured to generate the bandgap reference voltage having a first voltage value when a clock signal is in a first logic level, and to generate the bandgap reference voltage having a second voltage value when the clock signal is in a second logic level. The filter circuit includes a first capacitive element charged with the bandgap reference voltage having the first voltage value in the first clock cycle, a second capacitive element charged with the bandgap reference voltage having the second voltage value in the first clock cycle, a third capacitive element charged with the bandgap reference voltage, and a fourth capacitive element.

Small-circuit-scale reference voltage generating circuit

A control device for a hybrid vehicle includes: a current command value calculator configured to calculate torque and a weak field current command values input to the inverter; and a current command value correction calculator configured to calculate torque and weak field current correction values added to the torque and weak field current command values, wherein when an accumulation of electricity of the electricity storage device is equal to or larger than a reference value, the current command value calculator is configured to calculate the torque and weak field current command values to make a load applied to the engine by the motor generator zero, and the current command value correction calculator is configured to calculate the torque and weak field current correction values to make a load applied to the engine by the motor driving system other than the motor generator zero.

Control device for hybrid vehicle and control method for hybrid vehicle

A reference voltage generating circuit with extremely low temperature dependence is provided. The reference voltage generating circuit includes a BGR circuit which generates a bandgap reference voltage; a bandgap current generating circuit which generates a bandgap current according to the bandgap reference voltage; a PTAT current generating circuit which generates a current proportional to the absolute temperature; and a linear approximate correction current generating circuit which compares the current generated by the PTAT current generating circuit and the bandgap current to generate a correction current, and the BGR circuit adds, to the bandgap reference voltage, a correction voltage generated based on the correction current.

Reference voltage generating circuit

A BGR circuit controls a switch circuit in synchronization with a clock signal from a control signal generating circuit and an inverted signal thereof, and thereby, alternately switches between a differential input terminal receiving a voltage VIM and a differential input terminal receiving a voltage VIP. An LPF circuit includes capacitive elements, a switch connected between an input node and each capacitive element, and a switch connected between an output node and each capacitive element. The LPF circuit controls ON/OFF of the switches in synchronization with a clock signal CLK, and thereby, calculates a moving average value of an output voltage of the BGR circuit in the most recent one clock cycle.

A reference voltage generating circuit that accurately corrects temperature characteristics of a BGR (bandgap reference) circuit and a regulator. A voltage dividing circuit outputs first and second voltages obtained by dividing a BGR voltage. The regulator includes a differential amplifier, first and second resisters coupled in series between the output terminal of the differential amplifier and the ground. The positive input terminal of the differential amplifier receives the BGR voltage, and the negative input terminal is coupled to a coupled node between third and fourth resistors. The BGR circuit outputs a third voltage varying with a temperature determined by a predetermined amount of current flowing in the BGR circuit and a predetermined resistor. A temperature-characteristics correcting circuit controls a correcting current flowing through the coupled node so that its magnitude varies with the difference between the first and third voltages, and the difference between the second and third voltages.

In a cluster ion beam irradiation apparatus including an apparatus for measuring size and energy distribution of gas cluster ions by using the time of flight (TOF) mass spectrometry, a unit for applying a retarding voltage is disposed in a stage preceding a TOF measuring instrument including a drift tube and a current measuring instrument. By measuring the size and energy distribution of the gas cluster ions and adjusting ionization conditions, cluster ions having predetermined energy and size are supplied to a work surface. In addition, a product of a pressure in an ion transportation device and an ion transportation length is controlled so as to satisfy the relation P&#xd7;L&#x2266;30/N/EPa&#xb7;m, where N is the size of gas cluster ions used for irradiation, and E is kinetic energy (eV) of the gas cluster ions.

Gas cluster-ion irradiation apparatus

A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.

Magnetic recording medium and magnetic recording and reproducing apparatus

In order to realize a shape of an air bearing surface of a magnetic head slider which is capable of coping with a lowering of flying height and which has high reliability, at the time of polishing the air bearing surface of the magnetic head slider by bringing the air bearing surface and the surface of a polishing machine into contact with each other, machining is conducted in the condition where the stiffness acting between both the members is enhanced, and the standard deviation of the flatness of the air bearing surface machined and the standard deviation of the recess amount between the air bearing surface and a magnetic element are controlled. Thus, it is possible to efficiently manufacture a magnetic head slider which enables driving at a low flying height.

Magnetic head slider and method of manufacturing the same

A plasma processing device include a plasma generation unit for generating plasma by using a cathodic arc discharge, first and second magnetic field ducts arranged in a row for transporting the plasma with one end of the row being connected to the plasma generation unit and a processing chamber connected to the other end of the row unit and having a stage for holding a substrate to be processed. A shutter is provided for covering the plasma during a period of a predetermined time after start of arc discharge or during a period of predetermined time before end of arc discharge. The shutter is disposed between the first magnetic field duct and the substrate to be processed, and is movable. The shutter is capable of being supplied with a voltage, and is kept in a state so as to be electrically insulated from the processing chamber.

Plasma processing apparatus with real-time particle filter

An ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N value is high. The ferromagnetic thin film as the magnetic film of the magnetic recording medium is such that the fluctuation field of magnetic viscosity at 25&#xb0; C. at the field strength equal to remanence coercivity or coercivity is not less than 15 oersteds and the coercivity is not less than 2000 oersteds.

Magnetic recording medium possessing a fluctuation field of not less than 30 Oe

A method of measuring variation in dimensions and alignment error of thin film magnetic heads formed on a raw bar cut-off from a substrate is provided. Such method comprises illuminating a MR element and a resistance detector element which is formed for monitoring a lapping process, both of which are formed on the raw bar, with illuminating light whose wavelength is 300 nm or less; forming an image by imaging light reflected from the elements; and converting the image to an image signal through photoelectric conversion so as to detect variation in dimensions of the MR element and the resistance detector element formed on the raw bar, and alignment error between the MR element and the resistance detector element with a high degree of accuracy.

Method for measuring dimensions and alignment of thin film magnetic head and apparatus therefor

A magnetic head is formed of materials having different hardnesses. The head includes a base coat formed on a substrate having a high hardness, for example alumina titanium carbide, upon which a base coat, for example alumina, is formed. The base coat typically had a thickness in the range of 0.05 to 0.5 &mgr;m. This structure provides an improved flying height for heads manufactured using a lapping process.

Thin film magnetic head with base coat and small pole-tip recess

Growing community of inventors

Yokohama, Japan

Kenji Furusawa