MAGNETIC HEAD FOR DETECTING MAGNETIC FIELD ON SURFACE OF MAGNETIC PATTERN BASED ON MAGNETO-RESISTANCE TECHNOLOGY
First Claim
1. A magnetic head for detecting a magnetic field on the surface of a magnetic pattern based on magneto-resistance technology, comprising:
- a frame;
a printed circuit board (PCB) arranged on the frame;
permanent magnets structure for generating a magnetic field parallel with the surface of the magnetic head; and
a magnetic sensor based on magneto-resistive (MR) elements, which is used for detecting the distribution of the vertical component of a magnetic field on the surface of the magnetic pattern.
1 Assignment
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Accused Products
Abstract
A magnetic head for detecting a magnetic field on the surface of a magnetic pattern based on a magneto-resistance technology comprises a support (1) and a PCB (Printed Circuit Board) (5) arranged on the support (1), and further comprises horizontal excitation structures (20, 21) used for generating a magnetic field parallel to the surface of the magnetic head; and a magnetic field detection component (4) based on magneto-resistance (MR) elements (R1-R4), the magnetic field detection component is used for detecting the distribution of vertical components of a leakage magnetic field on the surface of a magnetic pattern. The magnetic head can effectively detect magnetic patterns made of soft magnetic materials or hard magnetic materials. The soft magnetic material is magnetized in an in-plane manner by means of the horizontal excitation structures (20, 21), so as to generate a specific leakage magnetic field on the surface of a magnetic pattern. A Wheatstone bridge structure connection based on the MR elements (R1-R4) is adopted to effectively detect the vertical components of such specific leakage magnetic field, thus the features of the magnetic patterns made of the soft magnetic materials or the hard magnetic materials can be effectively detected.
19 Citations
9 Claims
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1. A magnetic head for detecting a magnetic field on the surface of a magnetic pattern based on magneto-resistance technology, comprising:
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a frame; a printed circuit board (PCB) arranged on the frame; permanent magnets structure for generating a magnetic field parallel with the surface of the magnetic head; and a magnetic sensor based on magneto-resistive (MR) elements, which is used for detecting the distribution of the vertical component of a magnetic field on the surface of the magnetic pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification