Kabushiki Kaisha Toshiba

Doryokuro Kakunenryo Kaihatsu Jigyodan

Osami Tsukamoto

Yukio Wada

Tomihisa Ogawa

Kazunori Yamamoto

Takeshi Ohara

Sadao Mori

Chie Miyake

Particles contained in a suspension are separated in accordance with their magnetic susceptibility and based on the variation in flow velocity of suspension. In order to achieve this magnetic separation, a pair of wall plates having at least one flat surface in which a plurality of ferromagnetic narrow wires are buried in parallel are positioned in parallel to each other with a small distance therebetween so that the flat surfaces are opposed to each other to form a channel. The suspension flows in a laminar state with different flow velocities through the channel in the longitudinal direction of the ferromagnetic wires. A magnetic field is externally applied to the channel in the direction perpendicular both to the flow direction and the wall plates. Particles are separated in accordance with their magnetic susceptibility and based on variation in flow velocity which interacts with the magnetic susceptibility.

Column and method for separating particles in accordance with their

In a servo type magnetic head drive control device, a moving velocity of a magnetic head is controlled on the basis of an error between an actual moving velocity value of the magnetic head generated using servo data and a target velocity value set in accordance with a moving distance to a target position. When the magnetic head is moved to a predetermined position, transient control is performing by using finite time settling control on the basis of position information and velocity information of the magnetic head, and normal tracking control or tracking control using the finite time settling control is performed to form positioning control of the magnetic head. Also a difference between the head position and the position of the head generated from a model is determined and used to control head movement.

Magnetic recording/reproducing apparatus capable of reducing a setting

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Mitaka, Japan

Osami Tsukamoto