EP0413397A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electro-mechanical transducer and positioning device comprising such an electro-mechanical transducer
Assignee: Koninklijke Philips NV
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Filing: 1990-08-15
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Granted: —
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Expires: 2010-08-15
Abstract
Abstract The addition of an additional, annular electrode pair to a tubular piezo-electric element, results in an electro-mechanical transducer in which a displacement range in an x-direction and a y-direction is independent of the displacement in the longitudinal direction of the element. Because of the additional electrode pair, the element can be driven by using only two power supply sources.
Inventors
- 👤 Hendrik Karel Moraal
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:44
CPC Classifications
G; G01; G01Q; G01Q10/00; G01Q10/04; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/35; G02B6/3564; G02B6/3568; G02B6/3578; H; H10; H10N; H10N30/00; H10N30/20; H10N30/202; H10N30/2027; G02B6/3502; G02B6/3504; G02B6/354; G02B6/3554; G02B6/3558
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
104 words
An electro-mechanical transducer, comprising a tubular piezo-electric element which is covered with an inner and an outer electrode over a length on an inner side and an outer side, respectively, which outer electrode comprises conductor segments which are electrically isolated from one another in a circumferential direction by insulating tracks, characterized in that the outer electrode comprises a further conductor segment which is electrically isolated from the conductor segments in a longitudinal direction by a further insulating track, the inner electrode comprising at least two inner conductor segments which are electrically isolated from one another in the longitudinal direction by an inner insulating track.
Claim 2
Dependent Claim
104 words
An electro-mechanical transducer, comprising a tubular piezo-electric element which is covered with an inner and an outer electrode over a length on an inner side and an outer side, respectively, which outer electrode comprises conductor segments which are electrically isolated from one another in a circumferential direction by insulating tracks, characterized in that the outer electrode comprises a further conductor segment which is electrically isolated from the conductor segments in a longitudinal direction by a further insulating track, the inner electrode comprising at least two inner conductor segments which are electrically isolated from one another in the longitudinal direction by an inner insulating track.
Claim 3
Dependent Claim
39 words
An electro-mechanical transducer as claimed in Claim 1, characterized in that it comprises an equal number of inner and outer conductor segments, radial projections of inner insulating tracks on the outer side being coincident with the outer insulating tracks.
Claim 4
Dependent Claim
41 words
An electro-mechanical transducer as claimed in Claim 1 or 2, characterized in that on the outer side the insulating tracks extend parallel to the longitudinal direction, an angular distance between two neighbouring insulating tracks on the outerside amounting to 90 degrees.
Claim 5
Dependent Claim
41 words
A positioning device for a relative displacement of two objects with respect to one another, which positioning device comprises an electro-mechanical transducer as claimed in any one of the preceding Claims, the electro-mechanical transducer being connected to one of the objects.
Claim 6
Dependent Claim
27 words
A positioning device as claimed in Claim 4, characterized in that the object connected to the positioning device is situated on the longitudinal axis of the element.
Claim 7
Dependent Claim
48 words
A positioning device as claimed in Claim 4 or 5, characterized in that the objects comprise a first and a second glass fibre, the positioning device acting as a switch for optically coupling the first glass fibre, being connected to the electro-mechanical transducer, to the second glass fibre.
Claim 8
Dependent Claim
25 words
A positioning device as claimed in Claim 6, characterized in that the second glass fibre forms part of a matrix consisting of several glass fibres.
Claim 9
Dependent Claim
27 words
A positioning device as claimed in Claim 4 or 5, characterized in that the object connected to the transducer comprises an electron source in an electron-optical system.
Claim 10
Dependent Claim
28 words
A positioning device as claimed in Claim 4 or 5, characterized in that the object connected to the transducer comprises a current-conducting needle in a scanning tunneling microscope.
References Cited (Backward Citations)
US4087715A
Cited
EP0239085A2
Cited
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