Magnetic sensor
AssigneeTDK Corporation
InventorKazuya Watanabe
Life of this patent
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Abstract
A magnetic sensor of the present invention has an elongate element portion having a magnetoresistive effect and a pair of elongate soft magnetic bodies that are arranged along the element portion on both sides of the element portion with regard to a short axis thereof. Each soft magnetic body includes a central portion that is adjacent to the element portion from one end to another end of the element portion with regard to a long axis direction thereof and a pair of end portions that protrude from the central portion in the long axis direction. A width of at least one of the end portions gradually decreases in a direction away from the central portion in at least a part of the end portions in the long axis direction thereof.
Claims14
A magnetic sensor comprising:
- an elongate element portion having a magnetoresistive effect;
- and
- a pair of elongate soft magnetic bodies that are arranged along the elongate element portion on both sides of the elongate element portion with regard to a short axis thereof,
- wherein each soft magnetic body includes a central portion that is adjacent to the elongate element portion from one end to another end of the elongate element portion with regard to a long axis direction thereof and a pair of end portions that protrude from the central portion in the long axis direction,
- as viewed in a direction that is perpendicular both to the long axis direction and to a short axis direction of the soft magnetic body, the central portion is rectangular, an entire edge of at least one of the end portions is formed by a curved line, and a width of the at least one of the end portions gradually decreases in a direction away from the central portion in the long axis direction thereof from a boundary between the end portion and the central portion, and
- a relationship W/2≤L is satisfied where W is a width of the central portion and L is a protruding length of the end portion from the boundary between the end portion and the central portion.
A magnetic sensor comprising:
- an elongate element portion having a magnetoresistive effect;
- and
- a pair of elongate soft magnetic bodies that are arranged along the elongate element portion on both sides of the elongate element portion with regard to a short axis thereof, wherein
- each soft magnetic body includes a central portion that is adjacent to the elongate element portion from one end to another end of the elongate element portion with regard to a long axis direction thereof and a pair of end portions that protrude from the central portion in the long axis direction,
- a width of at least one of the end portions gradually decreases in a direction away from the central portion in at least a part of the end portions in the long axis direction thereof,
- an edge of the end portion is expressed by a first curve in a first quadrant of a Cartesian coordinate and by a second curve in a second quadrant of the Cartesian coordinate, as viewed in a direction that is perpendicular both to the long axis direction and to the short axis direction,
- in the Cartesian coordinate, an origin (0,0) represents coordinates of a middle point of an imaginary boundary line between the end portion and the central portion, an X axis is the imaginary boundary line and a Y axis is an imaginary straight line that passes through the coordinates of the middle point and that extends in the long axis direction, and
- the first curve is expressed by the following formula and the second curve is in line symmetry with the first curve with regard to the Y axis:
- (X,Y)=(W/2×cosθ, L×sin (θ+P×sin (2θ)) (formula 2)
- where
- W:
- a width of the central portion
- L:
- a length of the end portion
- P:
- a strain angle
- θ:
- an angle in the Cartesian coordinate system.
Dependencies are inferred from the claim text.