SURFACE WITH VARYING ELECTRICAL OR MAGNETIC PROPERTIES

A substrate (2) has a surface on which is provided a modifying layer which is incomplete and has a distribution such as to provide a plurality of islands of said material and/or islands of substrate surface whereby the surface exhibits a modified electrical and/or magnetic property. As shown, substr...

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Bibliographische Detailangaben
Hauptverfasser:	TREEN, ANDREW, SHAUN, MORRIS, GEORGE, WILLIAM
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ANTENNAS, i.e. RADIO AERIALS BASIC ELECTRIC ELEMENTS CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DEAF-AID SETS DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FOR PERFORMING MECHANICAL WORK IN GENERAL GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL INDUCTANCES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS MAGNETS METALLURGY METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICALVIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY PERFORMING OPERATIONS PUBLIC ADDRESS SYSTEMS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSFORMERS TRANSPORTING
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Beschreibung
Zusammenfassung:	A substrate (2) has a surface on which is provided a modifying layer which is incomplete and has a distribution such as to provide a plurality of islands of said material and/or islands of substrate surface whereby the surface exhibits a modified electrical and/or magnetic property. As shown, substrate (2) is piezoelectric, and has a central electrode (9) and a peripheral electrode (10), between which are deposited a large number of electrically conductive dots having a dot density which decreases with distance from electrode (9). The construction acts as a sonar transducer over a relatively wide frequency range. L'invention concerne un substrat (2) présentant une surface sur laquelle est déposée une couche de modification incomplète et répartie de manière à obtenir une multitude d'îlots constitués dudit matériau et/ou d'îlots formés par la surface du substrat, la surface présentant une propriété magnétique et/ou électrique modifiée. Selon le mode de réalisation décrit dans l'invention, le substrat (2) est piézo-électrique et il comprend une électrode centrale (9) et une électrode périphérique (10) entre lesquelles sont déposés un grand nombres de points conducteurs présentant une densité de point qui diminue avec la distance de l'électrode (9). L'ensemble décrit dans cet invention fait office de transducteur sonar sur une gamme de fréquence relativement étendue.