Magnetic sensor and manufacturing method therefor
First Claim
1. A manufacturing method for a magnetic sensor comprising:
- forming a planation layer that provides planation by covering a wiring layer of a semiconductor substrate;
forming a passivation film on the planation layer;
forming a thick film on the passivation film;
forming a resist film on the thick film;
partially removing the resist film;
performing etching on the resist film and the thick film, thus forming a plurality of channels in the thick film;
forming an opening in the thick film to form a via;
forming a wiring film on a planar surface of the thick film as well as slopes, top portions, and bottom portions of the channels;
connecting the wiring film to a conductive portion of the via;
forming magneto-sensitive elements on the slopes of the channels; and
connecting the wiring film to the magneto-sensitive elements.
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Accused Products
Abstract
A magnetic sensor for detecting the intensity of a magnetic field in three axial directions, in which a plurality of giant magnetoresistive elements are formed on a single semiconductor substrate. A thick film is formed on the semiconductor substrate; giant magnetoresistive elements forming X-axis and Y-axis sensors are formed on a planar surface thereof; and giant magnetoresistive elements forming a Z-axis sensor are formed using slopes of channels in the thick film. Each of the slopes of the channels can be constituted of a first slope and a second slope, so that a magneto-sensitive element is formed on the second slope having a larger inclination angle. In order to optimize the slope shape and inclination with respect to each channel, it is possible to form a dummy slope that does not directly relate to the formation of the giant magnetoresistive elements.
46 Citations
9 Claims
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1. A manufacturing method for a magnetic sensor comprising:
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forming a planation layer that provides planation by covering a wiring layer of a semiconductor substrate; forming a passivation film on the planation layer; forming a thick film on the passivation film; forming a resist film on the thick film; partially removing the resist film; performing etching on the resist film and the thick film, thus forming a plurality of channels in the thick film; forming an opening in the thick film to form a via; forming a wiring film on a planar surface of the thick film as well as slopes, top portions, and bottom portions of the channels; connecting the wiring film to a conductive portion of the via; forming magneto-sensitive elements on the slopes of the channels; and connecting the wiring film to the magneto-sensitive elements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A manufacturing method for a magnetic sensor comprising:
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forming a conductive pad on a semiconductor substrate; forming a thick film; forming a resist film on the thick film; performing etching on the resist film and the thick film, thus forming a plurality of channels in the thick film, each of the channels having slopes, top portions, and bottom portions; forming an opening in the thick film to form a via exposing the conductive pad; forming a wiring film on a planar surface of the thick film as well as the slopes, top portions, and bottom portions of the channels; connecting the wiring film to the conductive pad; forming magneto-sensitive elements on the slopes of the channels; and connecting the wiring film to the magneto-sensitive elements.
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Specification