Honda Giken Kogyo Kabushiki Kaisha

Japan Science and Technology Corporation

Masaaki Tanaka

Teiji Miwa

Takashi Kubo

Chitoshi Kato

Masayuki Fukumori

Toshiaki Hayashi

Goro Uchida

Yoshio Akasaka

Kenji Kusumegi

Hideo Saitoh

Masashi Koike

Kenichi Kakijima

Takeshi Endoh

Nagahisa Kitamura

Takefumi Fujie

Daiji Sukawa

Satoshi Endoh

A ferromagnetic double quantum well tunneling magnetoresistance device is disclosed that utilizes a two-dimensional electron (positive hole) system to obtain an infinitely great magnetoresistance ratio. Also disclosed are a sensitive magnetic sensor and a nonvolatile storage device derived from that device. In structural terms of the device, a first and a second quantum well layer of ferromagnetic material ( ) in each of which the quantum confinement for carriers is established in a two-dimensional electron (positive hole) state are each sandwiched between a pair of barrier layers of nonmagnetic material ( ) through which the carriers can tunnel. The first and second quantum well layers ( ) have a difference in coercive force so that when an external magnetic field is applied thereto only one of them may be reversed in the direction of magnetization. As a result, if magnetizations of the two quantum wells are parallel to each other, tunneling is allowed to occur, and if they are antiparallel to each other, tunneling is inhibited. A infinitely great tunneling magnetoresistance ratio is thereby obtained.

Ferromagnetic double quantum well tunnel magneto-resistance device

On a setting cart which is movable back and forth between a setting station and a vehicle body assembly station, there are provided floor panel setting members, side sill receiving members and side panel forcing members which force side panels toward a floor panel from a lateral outward. In the setting station, the floor panel and the side panels which are set in position on the setting cart are transferred to a jig which is disposed in a side portion of the vehicle body assembly station. The side panels are welded to the floor panel by welding robots which are disposed at a level below the jig. In the above-described arrangement, the side sill receiving members and the side panel forcing members are set on the setting cart so as to be retractable into shunted positions free from interference with the welding robots in welding operation. The welding work by the welding robots can thus be started without waiting for the returning of the setting cart to the setting station.

Apparatus for assembling vehicle body

A method for assembling a motor vehicle body by fixing relative positional relationship among a plurality of motor vehicle body constituent parts by means of positioning members provided in a welding jig which is disposed on each side of an assembly station and, in this condition, welding together the plurality of motor vehicle body constituent parts at a plurality of tack-welding locations. First welding guns of indirect feeding type are mounted on the welding jig to weld a part of the tack-welding portions. A welding robot having mounted thereon a second welding gun is disposed outside the welding jig. The above-described part of the tack-welding portions are welded by supplying electric power from the second welding gun to the first welding guns by pinching, by the second welding gun, feeder terminals of the first welding guns in a condition in which the above-described part of the tack-welding portions are being pinched by the first welding guns. The remaining of the tack-welding portions are thereafter welded by the second welding gun.

Method and apparatus for assembling motor vehicle body

Growing community of inventors

Saitama-ken, Japan

Masaaki Tanaka