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US 8,945,946 B2Granted
Sensor element and detection method of magnetic particles using this element, and detection method of target substance
AssigneeCanon Kabushiki Kaisha
InventorTakashi Ikeda
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Abstract
A sensor device is configured by using a sensor element including functions as a magnetic field sensor and capable of generating the magnetic field for collecting magnetic particles on a sensor surface by the application of the current. As a result, a sensor device can be provided in which the magnetic particles serving as a label can be effectively collected on the sensor, and at the same time, the influence given to the sensor by the magnetic field for collecting the magnetic particles can be reduced.
Claims5
A sensor device for detecting magnetic particles in a specimen, comprising:
- a sensor element having a detection surface for detecting the magnetic particles and capable of generating a magnetic field for collecting the magnetic particles on the detection surface by application of a current;
- a current applying unit for letting the current flow to the sensor element;
- and
- a signal taking out unit for obtaining a change in the magnetic field on the detection surface as an electrical output signal,
- wherein a circuit is formed by connecting the current applying unit to the sensor element with a wiring,
- wherein a cross-sectional area of the sensor element perpendicular to a direction of the current flowing on the sensor element is smaller than a cross-sectional area of the wiring perpendicular to a direction of the current flowing on the wiring, and
- wherein the center axis in the length direction of the sensor element is displaced from the center axis in the length direction of the wiring toward a region of the sensor device in which the magnetic particles exist.
4 more elements
Dependencies are inferred from the claim text.