Sumitomo Chemical Company, Limited

Nec Corporation

Tokyo Institute of Technology

Mitsubishi Electric Corporation

Masayuki Fujita

Tatsuya Miyatake

Kohtaro Osakada

Daisuke Takeuchi

Yoshinori Seki

Sehoon Park

Nobuo Oi

Takahiro Ishii

Makoto Uemura

Tsuyoshi Watanabe

Masaaki Nabika

Hayato Kihara

Wataru Hirahata

Miwa Saeki

Takashi Nakagawa

Hidetoshi Ikeda

Yuji Igarashi

Takashi Iwasaki

Hiroyoshi Nakajima

Kenji Atarashi

Osamu Ihata

Hiroshi Kuribayashi

Takeshi Hatanaka

Yukio Adachi

Ryuichi Matsuura

Sakashi Oyama

A motor control apparatus includes a reference model unit configured to generate a model output, a feedback unit configured to generate a feedback, and an adder configured to add up the model input and the feedback and generate a control input to the controlled object. The reference model unit includes a storing unit configured to retain, as a vector, a present value of the target value and one or a plurality of past values of the target value, a numerical model configured to simulate a characteristic of the controlled object and generate the model output and a state variable on the basis of the model input, a model controller configured to generate the model input and a controller determining unit configured to determine the model controller.

Motor control apparatus

A homopolymer having a monomer unit such as an isopropylidene diallylmalonate unit; a process for producing said homopolymer comprising the step of homopolymerising a monomer such as isopropylidene diallylmalonate; a copolymer containing said monomer unit and an ethylene unit and/or &#x3b1;-olefin unit; and a process for producing said copolymer comprising the step of copolymerizing a monomer such as isopropylidene diallylmalonate with at least ethylene and/or an &#x3b1;-olefin.

Copolymer and production process thereof

Homopolymer and copolymer, and production process thereof

A polymer containing units represented by the defined formula (1); and a process for producing the polymer, which comprises the step of polymerizing a compound represented by the defined formula (3), the units represented by the formula (1) being polymerized units of the compound represented by the formula (3) such as 9,9-diallylfluorene.

Diene polymer and process for producing the same

A polymer containing units represented by the defined formula (1); and a process for producing the polymer, which comprises the step of polymerizing a compound represented by the defined formula (3), the units represented by the formula (1) being polymerized units of the compound represented by the formula (3) such as 1,6-heptadiene.

A copolymer comprising (i) an olefin unit selected from the group consisting of an ethylene unit and an &#x3b1;-olefin unit having 3 to 20 carbon atoms, and (ii) a unit of a compound represented by the formula, CH&#x2550;CH&#x2014;(R)&#x2014;SOX; and a process for producing said copolymer comprising the step of contacting (i) the above-mentioned olefin, and (ii) the above-mentioned compound with a polymerization catalyst, wherein m is a number of 0 or 1, Ris an aliphatic hydrocarbylene group having 1 to 18 carbon atoms, and X is a mono-valent cationic species.

Copolymer containing functional group of sulfonic acid or its salt, and process for producing said copolymer

A polar monomer-olefin copolymer comprising a polar monomer unit in an amount of 50 to 75% by mol and an olefin unit in an amount of 25 to 50% by mol, and containing a chain structure consisting of two or more olefin units; a process for producing said copolymer comprising the step of radically copolymerizing 100 parts by mol of an olefin with 1 to 100 parts by mol of a polar monomer; and a process for producing said copolymer comprising the step of radically copolymerizing an olefin having a concentration in a polymerization reactor of 0.04 to 100 mol/liter with a polar monomer having a concentration therein of 0.01 to 25 mol/liter.

Polar monomer-olefin copolymer and process for producing the same

A modified aluminum oxy compound (A) obtained by reacting an aluminum oxy compound (a), water (b) and a compound having a hydroxyl group (c); a polymerization catalyst component comprising the modified aluminum oxy compound; a polymerization catalyst obtained by contacting said modified aluminum oxy compound (A), a transition metal compound (B) and optionally an organoaluminum compound (C) and a specified boron compound; and a process for producing an olefin polymer or an alkenyl aromatic hydrocarbon polymer with the polymerization catalyst.

Modified aluminum oxy compound, polymerization catalyst and process for producing olefin polymer and alkenyl aromatic hydrocarbon polymer

A lens actuator keeps an objective lens focused on a track in an information recording layer of an optical disc against fluctuation unavoidable for the optical disc, and has a lens holder, three electromagnetic actuators for moving and tilting the lens holder and three pairs of elastically deformable conductive connecting rods connected to both side surfaces of the lens holder for movably retaining the lens holder over a base plate; since two pairs of elastically deformable conductive connecting rods are symmetrically arranged on upper and lower sides of the remaining pair, the lens holder is smoothly tilted and moved in the radial direction of the optical disc without any tilt, whereby the lens actuator promptly and exactly cancels the fluctuation of the optical disc.

Lens actuator incorporated in optical information storage system for promptly canceling fluctuation of radial tilt angle of rotating disc

When a lens holderA is in a neutral position, a ratio of a gap between opposing surfaces of one tilt magnetand one tilt coilwhich oppose to each other, to a radial direction thickness of the tile magnetis in the range of 1/2 to 1/3. In at least one tilt coil of the tilt coils, a ratio of a light axis direction inside distance of the tilt coil to a light axis direction height of the tilt magnet, is in the range of 1/1.5 to 1/4. With this arrangement, even if the objective lens is shifted in a tracking direction or in a focusing direction, variation in the sensitivity and the linearity of the radial tilt movement is small, and an internally accessible area is increased.

Objective lens driving device

Modified aluminum oxy compound, polymerization catalyst and process for producing olefin polymer and alkenyl

Process for producing solid product, solid catalyst component, and catalyst for olefin polymerization, and process for producing olefin polymer

A modified aluminum oxy compound(A) obtained by reacting an aluminum oxy compound(a), water (b) and a compound having a hydroxyl group(c); a polymerization catalyst component comprising the modified aluminum oxy compound; a polymerization catalyst obtained by contacting said modified aluminum oxy compound(A), a transition metal compound(B) and optionally an organoaluminum compound(C) and a specified boron compound; and a process for producing an olefin polymer or an alkenyl aromatic hydrocarbon polymer with the polymerization catalyst.

An olefin polymerization catalyst obtained by contacting a specific transition metal compound(A), an organoaluminumoxy compound (B) soluble in an aromatic solvent and water (C), and a process for producing an olefin polymer with said catalyst.

Olefin polymer, olefin polymerization catalyst and process for producing olefin polymer

An olefin polymer of an alkenyl hydrocarbon having 5 or more carbon atoms, wherein said olefin polymer is an amorphous polymer having a Mn of 300,000 and a Mw/Mn of 2.40 or less, and substantially not having a melting point, and a process for producing said olefin polymer which comprises polymerizing an alkenyl hydrocarbon having 5 or more carbon atoms with an olefin polymerization catalyst obtained by contacting: a specific transition metal compound(A), an organoaluminumoxy compound (B) soluble in an aromatic solvent and water (C).

Growing community of inventors

Ichihara, Japan

Masayuki Fujita