Package for the magnetic field sensitive device
First Claim
1. A package for a magnetic field sensitive device comprising:
- a permanent magnet having a planar major surface;
a pair of coplanar members of a magnetic and electrically conductive material having their major faces dispersed on said magnet major surface, said members having facing edges which are in closely spaced from one another, to provide a narrow gap therebetween, effective to provide a substantially complete ferromagnetic covering on said magnet major face and two electrically isolated sites for making electrical contact with a magnetic field sensitive element to be mounted on outer major faces of said members;
a terminal tab integral with each of said members and extending away from said gap;
dielectric means disposed between said magnet and said members for preventing a low electrical resistance path between said members on said magnet surface,a magnetic field sensitive element on an outer major face of at least one of said members, said element having an active region of a magnetic field sensitive material and spaced contacts on the active region; and
means electrically connecting each of the element contacts to a separate one of the members, effective to provide a magnetic field sensitive device that can exhibit a travelling wave of higher intensity magnetic flux across the faces of said coplanar members, and also have integral connection tabs for making electrical connection to said device.
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Accused Products
Abstract
A package for a magnetic field sensitive element, such as a magnetoresistor, includes at least two planar layers of a relatively stiff ferromagnetic material which is also electrically conductive. The layers have opposed edges which are in closely spaced relation to form a narrow gap therebetween. A terminal tab is integral with and extends from each layer. A magnetic field sensitive element is on a surface of at least one of the layers and preferably extends across the gap to be on both layers. The magnetic field sensitive element has a pair of contacts each of which is electrically connected to a separate one of the layers. A permanent magnet is mounted on and insulated from the surface of the layers opposite the magnetic field sensitive element. A protective layer of an insulating material may cover the magnetic field sensitive element and the layers with the terminal tabs extending therefrom.
78 Citations
28 Claims
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1. A package for a magnetic field sensitive device comprising:
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a permanent magnet having a planar major surface; a pair of coplanar members of a magnetic and electrically conductive material having their major faces dispersed on said magnet major surface, said members having facing edges which are in closely spaced from one another, to provide a narrow gap therebetween, effective to provide a substantially complete ferromagnetic covering on said magnet major face and two electrically isolated sites for making electrical contact with a magnetic field sensitive element to be mounted on outer major faces of said members; a terminal tab integral with each of said members and extending away from said gap; dielectric means disposed between said magnet and said members for preventing a low electrical resistance path between said members on said magnet surface, a magnetic field sensitive element on an outer major face of at least one of said members, said element having an active region of a magnetic field sensitive material and spaced contacts on the active region; and means electrically connecting each of the element contacts to a separate one of the members, effective to provide a magnetic field sensitive device that can exhibit a travelling wave of higher intensity magnetic flux across the faces of said coplanar members, and also have integral connection tabs for making electrical connection to said device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. In a magnetoresistor magnetic circuit which includes an exciter having teeth spaced apart by slots and a magnetoresistor sensor package having a magnetoresistor element mounted over the exciter with the exciter being movable across the magnetoresistor element, the improvement comprising:
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a permanent magnet having a planar major surface, at least two coplanar members of a magnetic and electrically conductive material, said members having opposed major faces, one face of each of which is disposed on said major surface of said magnet, said member further having corresponding edges which are in closely spaced relation to provide a narrow gap therebetween, effective to provide both means for providing a travelling wave of magnetic flux across said magnet major surface but also to provide a support and electrical terminals for a magnetic field sensitive element to be disposed on at least one of said members; a terminal tab integral with and extending from each of the members; a magnetoresistor element mounted on an outer face of at least one of said members, said magnetoresistor element having an active region of a magnetoresistor material and spaced contacts on the active region; means electrically connecting each of the contacts to a separate one of the members; and
a permanent magnet secured to and insulated from a face of the members opposite that on which the magnetoresistor element is disposed. - View Dependent Claims (20, 21, 22, 23)
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- 24. A lead frame for a magnetic field sensitive element package comprising an elongated strip of a ferromagnetic material having spaced parallel side strips, a plurality of square areas arranged in spaced relation between and parallel to the side strips, opposed connecting second strips extending between the square areas and the side strips for supporting the square areas between the side strips and for providing integral opposed tabs on said square areas, and a narrow slit in each square area extending parallel to the side strips for electrically separating said square area into two parts.
- 26. A lead frame for a magnetic field sensitive element package comprising an elongated flat strip of a ferromagnetic material having spaced, parallel side strips, and a plurality of groups of three spaced, parallel second strips extending between and connected to the side strips, the middle strip of each group of second strips having opposed edges which are in closely space relation to an adjacent edge of the other two second strips so as to form narrow gaps between the strips.
Specification