Thomson-csf

Compagnie Europeenne De Composants Electroniques

Compagnis Europeenne De Composants Electroniques

Alain Jacobelli

Pierre Hartemann

Paul-Louis Meunier

Henriette Magna

Jean-Marc Coutellier

Gerard Doriath

Jean-Luc Rolland

Maurice Penot

Jean-Yves Beguin

Method for detection of end of grinding of a thin layer magnetic head

A method for achieving the planar surface of an active face for magnetic recording/reading heads. The planar surface of the active face is obtained by grinding, the active face being of the type where, before the grinding operation, the level of the material forming the gap is recessed with respect to the magnetic poles, the method comprising depositing over the recess a thin layer of non-magnetic material with a thickness at least equal to the recess of the gap. The non-magnetive thin layer may then be ground to obtain the planar surface of the active face.

Method for achieving the planar surface of an active face for a magnetic

A process and apparatus for measuring a magnetic field based on the Faraday effect rotation of a light beam passing through a ferrimagnetic coating subject to a magnetic field to be measured is shown. The magnetization direction within the ferrimagnetic coating is coherently oriented by applying a high amplitude alternating magnetic field oriented in accordance with the axis of the light beam. This is followed by a progressive reduction of the amplitude of this magnetic field and the magnetic field to be measured is compensated. A system and a measuring cell making it possible to perform said process is also shown.

Measuring system and measuring cell for making magnetic field

An elastic surface wave accelerometer having a deformable structure, fixed at one end and providing at its free end a seismic mass. The deformable structure may be an open frame with a single post or a closed frame with two posts. The accelerometer can measure movement of a missile or that of a gravitational field.

Elastic surface wave accelerometers

Growing community of inventors

St Michel Sur Orge, France

Alain Jacobelli