JP4804764B2 - Small magnetic sensor element that detects magnetic field in three dimensions - Google Patents

Description

  The present invention relates to a magnetic sensor element used in an electronic compass used for navigation, attitude control, and the like, and more particularly to a fluxgate type magnetic sensor element that detects a magnetic field in three dimensions.

  Conventionally, when trying to configure a magnetic sensor that detects a magnetic field in three dimensions using an elongated magnetic detection element such as a fluxgate element, the first, second, and third fluxgate elements are used, The second fluxgate element is arranged with a crossing angle of 90 ° in any two horizontal planes (X axis and Y axis), but the third fluxgate element is perpendicular to the horizontal plane. They are arranged in the direction of the upright axis (referred to as the Z axis) (see, for example, Patent Document 1). Here, the fluxgate element is formed by rotating a coil around a magnetic core made of a magnetic material rod, and detects the strength of the magnetic field in the direction of the magnetic core based on the output of the coil.

Japanese Patent Laid-Open No. 9-304077 (second page, FIG. 3, FIG. 4, FIG. 6)

Here, the principle of operation of the conventional three-dimensional magnetic sensor as described above will be described. As shown in the model diagram of FIG. 10, fluxgate elements 111, 112, and 113 are arranged along three axes X, Y, and Z that are orthogonal to each other. These fluxgate elements are arranged at a place where a three-dimensional magnetic field H shown in FIG. 11 exists. As shown in FIG. 11, the X direction component of the magnetic field H is represented by Hx, the Y direction component is represented by Hy, and the Z direction component is represented by Hz. Here, the vector H of the three-dimensional magnetic field can be regarded as a vector formed by combining the vector Hx in the X-axis direction, the vector Hy in the Y direction, and the vector Hz in the Z direction. By the way, in general, when the angle formed between the direction of the magnetic field and the fluxgate element is θ, the object of detection is obtained by multiplying the strength of the magnetic field by cos θ. Therefore, if the intensity of the magnetic field to be detected by the fluxgate 111 arranged in the X-axis direction is A1, A1 = Hxcos 0 ° + Hycos 90 ° + Hz cos 90 ° = Hx
If the strength of the magnetic field to be detected by the fluxgate 112 arranged in the Y-axis direction is B1,
B1 = Hx cos 90 ° + Hy cos 0 ° + Hz cos 90 ° = Hy
C1 = Hxcos 90 ° + Hycos 90 ° + Hz cos 0 ° = Hz if the strength of the magnetic field to be detected by the fluxgate 112 arranged in the Z-axis direction is C1.
It becomes. In this manner, the flux gates 111, 112, and 113 can detect the three-dimensional components Hx, Hy, and Hz of the magnetic field H, respectively.

Here, for reference, a method for obtaining the orientation of the magnetic field H from the three-dimensional components Hx, Hy, Hz of the magnetic field H in a magnetic orientation measuring means such as an electronic compass will be described. For example, the direction and magnitude of the three-dimensional magnetic field vector H can be obtained by sequentially combining Hx, Hy, and Hz. That is, as shown in FIG. 11, if a combined vector H1 of Hx and Hy is considered and the angle from the X axis on the XY plane is φ1,
φ1 = tan ⁻¹ (Hy / Hx) (1)
The absolute value of H1 is (H1) ² = Hx ² + Hy ²
It becomes. Next, considering a three-dimensional vector H obtained by combining the vector H1 with the vector H1, and assuming that the rotation angle from H1 to H is φ2,
φ2 = tan ⁻¹ (Hz / H1)
= Tan ⁻¹ [Hz / (Hx ² + Hy ² ) ^−1/2 ] (2)
It becomes. The absolute value of the three-dimensional vector H is H ² = (H1) ² + Hz ² = Hx ² + Hy ² + Hz ² ... (3)
It becomes. In this way, the components Hx, Hy, and Hz in the X, Y, and Z directions of the magnetic field vector H are detected by the three-dimensional magnetic sensor, and these values are input to the magnetic direction measuring means such as an electronic compass and calculated by the calculating means. By performing the above, φ1 and φ2 can be calculated from the equations (1) and (2), and the three-dimensional orientation of the magnetic field vector H can be specified, and the magnitude can be obtained from the equation (3). be able to.

  In this way, a three-dimensional magnetic sensor using a conventional fluxgate element can detect a three-dimensional magnetic field by directly detecting the components in the X, Y, and Z directions, and based on the detection result. Thus, it is possible to use a magnetic orientation measuring means such as an electronic compass to detect a three-dimensional magnetic orientation. However, in the arrangement of the fluxgate elements in such a conventional three-dimensional magnetic sensor, as shown in FIG. 10, the third fluxgate element (113) is a horizontal plane determined by the first and second fluxgate elements ( It has to be arranged upright with respect to the (XY plane), and requires a space equal to or greater than the length of the fluxgate element in the height direction of the three-dimensional magnetic orientation detection sensor. For this reason, although the shape of the magnetic sensor device was a cubic type, it could not be mounted on a portable information device or the like where the height of the parts is limited. Therefore, as a means to reduce the thickness of a three-dimensional magnetic direction detection sensor using a fluxgate element, only a fluxgate element for Z-axis is used as a semiconductor type fluxgate element (detects a magnetic field perpendicular to the element surface). Although it is conceivable to use a fluxgate element having a characteristic, there is a problem that mounting a different type of element requires a separate drive circuit for the element and complicates the manufacturing process.

  The present invention is a three-dimensional magnetic output sensor using a fluxgate element as described above, and reduces the dimension in the thickness direction compared to the conventional one without causing any special complication of the manufacturing process. It is an object to improve so that it can be mounted on a portable information device or the like.

As a first means for solving the above problems , the present invention provides a magnetic sensor element that detects a magnetic field in three dimensions using a fluxgate element.
A magnetic sensor element substrate arranged on a horizontal plane, a control IC fixed on the substrate, a pedestal arranged in a rectangular parallelepiped on the substrate and having a columnar shape in one direction, and fixed to a vertical side surface of the pedestal. With respect to at least one of the X axis and the Y axis arranged on the horizontal plane, two flux gate elements are set as a set, and each flux gate element is 1 ° in the plus and minus directions with respect to the horizontal plane. And one fluxgate element of the fluxgate element that is a set of the two is inclined in the plus direction with respect to the horizontal plane, and the other fluxgate element Is tilted in the minus direction with respect to the horizontal direction, and the absolute value of the tilt angle in the plus direction is equal to the absolute value of the tilt angle in the minus direction. The intensity of the magnetic field component in the X-axis or Y-axis direction is calculated using the sum of the fluxgate element and the output and the other fluxgate element and the output, and the magnetic field component in the Z-axis direction orthogonal to the horizontal plane is calculated using the difference in output. And a calculating means for calculating the intensity of .

As a second means for solving the above-mentioned problems , the present invention provides a first pedestal and a second pedestal to which the flux gate elements, each of which is a set of the two, are fixed. A third pedestal to which the control IC is fixed and another fluxgate element is fixed is arranged perpendicularly to the first pedestal and the second pedestal, and the three pedestals are used to control the control IC. Is arranged so as to surround from three directions .

As third means for solving the above problems, the present invention is Oite the first hand stage, the two pair and the fluxgate element are fixed to both side surfaces of the first seat The other fluxgate element is fixed to the third pedestal arranged orthogonal to the first pedestal, and the control IC is arranged inside the L-shape composed of the first pedestal and the third pedestal. It is characterized by being.

According to the first hand stage, as a set of two fluxgate element for at least uniaxial X and Y axes are arranged in a horizontal plane, each of the flux-gate elements in the plus and minus directions with respect to the horizontal plane 1 Since the inclination is provided at an inclination angle in the range of from 45 ° to 45 °, the dimension in the thickness direction can be reduced. Moreover, even if it has such an inclination, the intensity of the magnetic field component in the X-axis or Y-axis direction is calculated using the sum of the outputs of each fluxgate element, and the Z-axis orthogonal to the horizontal plane using the difference The intensity of the magnetic field component in the direction can be calculated, and a three-dimensional magnetic field can be specified from these. As described above, according to the present invention, it is possible to reduce the thickness dimension of the magnetic sensor element that detects a three-dimensional magnetic field component by dealing with the hardware surface and the software surface.

According to the first means, it is easy to calculate the horizontal and vertical components of the magnetic field from the output of each fluxgate element.

According to the second means and the third means, the spacing between flux gate element is secured, the interference between the flux gate element can be prevented, stable operation can be ensured.

The best mode for carrying out the present invention is to use a magnetic sensor for detecting a magnetic field in three dimensions using a fluxgate element, and two fluxgate elements for at least one of the X axis and the Y axis arranged on the horizontal plane. As a set, each fluxgate element is arranged with an inclination in the range of 1 ° to 45 ° in the plus and minus directions with respect to the horizontal plane,
A configuration is provided that includes calculation means for calculating a three-dimensional component of the magnetic field by calculation based on each output of the fluxgate element and the sine or cosine of the tilt angle.

Based on the above-described best mode, the principle of the present invention will be described before describing an embodiment which is a specific mode of the present invention. The present invention is different from the conventional method using three fluxgate elements orthogonal to each other (see FIG. 10), so that the X, Y and Z axes of the magnetic field H as shown in FIG. Hx, Hy, and Hz, which are direction components, are detected. That is, according to the present invention, at least two fluxgate elements among the plurality of fluxgate elements have an inclination angle of 1 ° to 45 ° with respect to a horizontal plane (XY plane) including the X axis and the Y axis. It is what you make. For example, as shown in FIG. 5, in the XZ plane, which is a plane including the X axis and the Z axis (axis perpendicular to the horizontal plane), the flux gate element 11 inclined by θ1 and the flux gate element 12 inclined by θ2 with respect to the X axis. Suppose that θ1 also has an absolute value of θ2 in the range of 1 ° to 45 °. Here, if the angle between the direction of the magnetic field and the fluxgate element is generally θ, the output of the fluxgate element is represented by kcosθ. Here, k is a detection constant. Since the fluxgate element 11 is inclined by θ1 with respect to the magnetic field Hx shown in FIG. 4, an output of k · Hx · cos θ1 is generated. Since it is inclined by (90 ° −θ1) with respect to the magnetic field Hz, an output of k · Hz · sin θ1 is generated. The angle of the fluxgate element 11 with respect to the magnetic field Hy is 90 ° (because it is in the XZ plane), so that the output is k · Hy · cos 90 ° = 0, and no output is generated. Therefore, the output A of the fluxgate output element 11 generated by the magnetic field H having components of Hx, Hy, Hz is A = k (Hx · cos θ1 + Hz · sin θ1) (4)
It becomes. Similarly, the output B of the fluxgate element 12 is B = k (Hx · cos θ2 + Hz · sin θ2) (5)
It becomes.
As shown in FIG. 6, when the fluxgate output elements 11 and 12 are on the YZ plane, the output of the fluxgate output element 11 is the one obtained by replacing Hx with Hy in the equation (4) based on the same principle. The output of the fluxgate output element 12 is obtained by replacing Hx with Hy in the equation (5).

For reference, when the fluxgate element 11 and the fluxgate element 12 are both in the XZ plane as described above, Hy, which is the Y component of the magnetic field, is not detected. The output is the same as when the flux gate element 11 detects the magnetic field H0 of the two-dimensional combined vector of Hx and Hz as shown in FIG. 7A, as shown in FIG. 7B. Here, both H0 and the fluxgate element 11 are in the XZ plane. In this case, if the inclination angle of H0 with respect to the X axis is θ0, sin θ0 = Hz / H0 cos θ0 = Hx / H0. The angle θ formed by the magnetic field H0 and the fluxgate element is θ = θ0−θ1. Therefore, the output A of the fluxgate element 11 is A = k · H0 · cos θ = k · H0 · cos (θ0−θ1).
= K · H0 (cos θ0 · cos θ1 + sin θ0 · sin θ1)
= K · H0 [(Hx / H0) · cos θ1 + (Hz / H0) · sin θ1]
= K (Hx · cos θ1 + Hz · sin θ1)
Which is in agreement with equation (4). Similarly, for the output B of the fluxgate element 1,
B = k · H0 · cos (θ0−θ2) = k (Hx · cos θ2 + Hz · sin θ2)
As a result, an expression that matches the expression (5) is established.

Next, a method for obtaining the magnetic field X and Z-axis components Hx and Hz from the output A of the fluxgate element 11 and the output B of the fluxgate element 12 will be described. As shown in FIG. 5, when the fluxgate element 11 and the fluxgate element 12 are arranged on the XZ plane, by solving simultaneous equations from the equations (4) and (5), Hz = (Acos θ2−Bcos θ1) / ksin (θ1-θ2) (6)
Hx = (Asin θ2-Bsin θ1) / ksin (θ2-θ1) (7)
It becomes. From equations (6) and (7), Hz and Hx can be calculated based on the output A and the output B even when the inclination angles θ1 and θ2 are arbitrary. As a special example, when the direction of the inclination angle is opposite and the absolute values are equal, that is, θ2 = −θ1, Hz = (A−B) / 2 ksin θ1 · ... (8)
Hx = (A + B) / 2 kcos θ1 (9)
Is established. In any case, the components Hx and Hz in the X and Z axis directions of the magnetic field can be obtained from the output A of the fluxgate element 11 and the output B of the fluxgate element 12.

Here, as shown in FIG. 6, when both the flux gate element 11 and the flux gate element 12 are arranged on the YZ plane and are inclined at inclination angles of θ1 and θ2 with respect to the Y axis, This can be obtained by applying the formula (6) or the formula (8). For the magnetic field component Hy in the Y direction, a formula in which Hx is replaced with Hy in the formula (7).
Hy = (Asin θ2-Bsin θ1) / ksin (θ2-θ1) (10)
This can be obtained by: In particular, in the case of θ2 = −θ1, the equation Hy = (A + B) / 2 kcos θ1 (11) in which Hx is replaced with Hy in the equation (9).
This can be obtained by: As described above, the magnetic field can be detected in three dimensions by obtaining the X, Y, and Z components Hx, Hy, and Hz of the magnetic field by calculation.
For example, in order to calculate Hx and Hz from the outputs of the fluxgate element 11 and the fluxgate element 12 arranged on the XZ plane and further obtain Hy, a pair of fluxgates arranged on the YZ plane as shown in FIG. Without using an element, as shown in FIG. 8, the third fluxgate element 13 is arranged in the Y-axis direction, and immediately after the output C, Hy = C / k (12)
Hy can also be obtained. In this way, when all of the X, Y, and Z components of the magnetic field, Hx, Hy, and Hz, are obtained, the three-dimensional orientation of the magnetic field can be obtained from the equations (1) and (2) already described. . If necessary, the strength of the magnetic field can be obtained from equation (3).

In addition to the example described above, for example, as shown in FIG. 9, the fluxgate element 11 of the pair of fluxgate elements 11 and 12 arranged on the XZ plane is horizontal, and the fluxgate element 12 Is tilted at an angle θ2 with respect to the X axis, from equations (6) and (7)
Hz = (B−Acos θ2) / ksin θ2 (11)
Hx = A / k (12)
Hz and Hx can be obtained as follows.
The principle of the present invention has been described above, but more specific embodiments of the present invention will be described below using examples.

  A three-dimensional magnetic sensor element (or a three-dimensional magnetic field sensor unit) according to Embodiment 1 of the present invention will be described below with reference to the drawings. 1A and 1B are diagrams illustrating a three-dimensional magnetic field sensor element 10 according to the first embodiment, in which FIG. 1A is a top view as viewed in the XY plane, FIG. 1B is a side view as viewed in the YZ plane, FIG. (C) is the side view seen in the XZ plane. In FIG. 1, 1 is a substrate, 2 is a first base, 3 is a second base, 4 is a third base, 5 is a control IC, 11 is a first fluxgate element, and 12 is a second fluxgate element. , 13 are third fluxgate elements. In these flux gate elements, for example, a coil is wound around a columnar magnetic core made of a magnetic material, and an output proportional to the magnetic field passing through the magnetic core is generated from the terminal of the coil. Direction) magnetic field components are detected. The pedestals 2, 3, 4 are substantially rectangular parallelepiped and have a long column shape in one direction. X, Y, and Z are axes orthogonal to each other, and the surface of the substrate 1 is parallel to an XY plane (horizontal plane) defined by the X axis and the Y axis. The pedestal 2 and the pedestal 3 are fixed on the substrate 1 so that the direction parallel to the X axis is the longitudinal direction at a distance. A control IC 5 is fixed on the substrate 1 between the pedestals 2 and 3. The pedestal 4 is fixed in a direction in which the longitudinal direction is parallel to the Y-axis at a position slightly separated from the end surfaces of the pedestal 2 and the pedestal 3 on the apparatus substrate 1. The base 2, 3, 4 surrounds the control IC 5 from three sides.

  The outer side surface 2b of the pedestal 2 is an XZ plane, on which the fluxgate element 11 is fixed in a state inclined by θ1 in the plus direction with respect to the X axis. The outer side surface 3b of the pedestal 3 is also an XZ plane, on which the fluxgate element 12 is fixed in a state inclined by θ2 in the minus direction with respect to the X axis. Here, the absolute values of θ1 and θ2 are greater than 1 ° and less than 45 °. The outer side surface 4b of the pedestal 4 is a YZ plane, and the fluxgate element 13 is fixed to this plane in parallel with the Y-axis direction. Lead wires are drawn out from the fluxgate elements 11, 12, 13 and connected to corresponding element connection terminals 7 provided on the bases 2, 3, 4. Reference numeral 8 denotes an IC connection terminal provided around the control IC 5 on the device substrate 1. The IC connection terminal is connected to the control IC 5 by connection means such as a wire, and is connected to the element connection terminal 7 by wiring means (not shown). The control IC 5 is provided with detection drive means for causing the fluxgate elements 11, 12, and 13 to perform detection operations and calculation means for performing calculations described later.

  Here, when the above-described three-dimensional magnetic sensor element 10 is placed in a three-dimensional magnetic field H, if the outputs from the fluxgate elements 11, 12, and 13 are A, B, and C, respectively, these outputs are The signal is input to the control IC 5 through the element connection terminal 7 and the IC connection terminal 8. Then, in the calculation means provided in the control IC 5, based on the outputs A, B and C, the X, Z and Y components Hx, Hz and Hy of the magnetic field H are respectively based on the principles already described (7), (6) and (12) are calculated. When the absolute values of θ1 and θ2 are equal, Hx and Hz are calculated by equations (8) and (9), respectively. Further, if necessary, the azimuth angles φ1 and φ2 of the magnetic field H are calculated by the equations (1) and (2) based on the calculated values of Hx, Hz, and Hy by the calculation means in the control IC 5. It is also possible to specify the three-dimensional direction of the magnetic field H. As described above, the three-dimensional magnetic sensor element 10 has a function of detecting a magnetic field in three dimensions by combining a plurality of fluxgate elements, which are hardware magnetic detection means, and a control IC that performs a software operation. A magnetic sensor element is configured. In this case, it is not necessary to use a fluxgate element that stands upright on a horizontal plane. Therefore, according to the first embodiment, a thin three-dimensional magnetic sensor having a small occupied space in the Z direction (thickness direction) can be configured, which is advantageous when used for a mobile phone, a small navigator, and the like. Further, since the fluxgate elements 11, 12, and 13 are arranged at a distance, they do not interfere with each other and can be accurately detected.

  A three-dimensional magnetic sensor element according to Embodiment 2 of the present invention will be described below with reference to the drawings. 2A and 2B are diagrams illustrating a three-dimensional magnetic sensor element 20 according to the second embodiment, in which FIG. 2A is a top view seen from the XY plane, FIG. 2B is a side view seen from the XZ plane, FIG. (C) is the side view seen in the YZ plane. In FIG. 2A, the horizontal direction is the X direction. As shown in FIG. 2, the pedestal 3 is omitted from the three-dimensional magnetic sensor element 10 shown in FIG. 1 in the three-dimensional magnetic sensor 20, and the fluxgate element 11 is fixed to one side surface 2b of the pedestal 2 so as to face this. The fluxgate element 12 is fixed to the other side surface 2c. Also in this case, the inclination angles θ1 and θ2 with respect to the X axis of the fluxgate element 11 and the fluxgate element 12 are the same as in the case of the apparatus unit 10 shown in FIG. The other structure is the same as that of the apparatus unit 10 of the magnetic sensor shown in FIG. Also in the second embodiment, the same outputs A, B, and C as those in the first embodiment are input to the control IC 5 from the flux gate elements 11, 12, and 13, respectively. Here, the same calculation as in the first embodiment is performed. The magnetic field H can be detected in three dimensions. In the case of the second embodiment, since only two pedestals 3 are required, the planar dimensions can be reduced as compared with the first embodiment.

  As a modification of the second embodiment, although not shown, the flux gate element 13 is removed from the three-dimensional magnetic sensor element 20 shown in FIG. 2 and ZY of the two side surfaces 4b and 4c facing the base 4 is used instead. In some cases, a pair of fluxgate elements that are inclined at different angles with respect to the Y-axis are arranged on the surface. In this example, Hy, which is the Y component of the magnetic field H, can be obtained by performing the calculation of equation (10) based on the output of the pair of fluxgate elements. In this case, Hx and Hz are obtained by calculation based on the outputs of the fluxgate element 11 and the fluxgate element 12 fixed to the pedestal 2 as in the three-dimensional magnetic sensor 20 shown in FIG.

A three-dimensional magnetic sensor element according to Embodiment 3 of the present invention will be described below with reference to the drawings. 3A and 3B are diagrams illustrating a three-dimensional magnetic sensor element 30 according to the third embodiment, in which FIG. 3A is a top view as viewed in the XY plane, FIG. 3B is a side view as viewed in the XZ plane, FIG. (C) is the side view seen in the YZ plane. In FIG. 3, 6 is a wide pedestal with a wide upper surface, and 14 is a flux gate element for the upper surface. As shown in FIG. 3, in the three-dimensional magnetic sensor element 30, the wide pedestal 6 is fixed on the substrate 1 in the X direction, and the fluxgate element 11 is fixed to the XZ plane of one side surface 6 b of the pedestal 6. The fluxgate element 12 is fixed to the other opposite side surface 6c, and the upper surface fluxgate element 14 is fixed to the XY surface of the upper surface 6d of the base 6 with an inclination angle of θ3 with respect to the X axis. Also in this case, the inclination angles θ1, θ2 with respect to the X axis of the fluxgate element 11 and the fluxgate element 12 are the same as those in the case of the three-dimensional magnetic sensor element 10 shown in FIG. Outputs A and B similar to those in the case of 1 are output. Here, assuming that the output of the flux gate element 14 for the upper surface is D, basically the same principle as described above (refer to the principle of the expression (4) or (5)).
D = K (Hx cos θ3 + Hysin θ3)
It becomes. From this, Hy
Hy = [(D / K) −Hxcos θ3] / sin θ3 (13)
Thus, Hy can be obtained using equation (13). That is, in the third embodiment, when the output A of the fluxgate element 11, the output B of the fluxgate element 12, and the output D of the fluxgate element 14 are input to the control IC 5, first, the expressions (6) and ( 7) Hz and Hx are calculated using equations. Next, Hy is calculated from the calculated Hx and output D using equation (13). From the thus calculated Hz, Hx, and Hy, the control IC 5 can also calculate the direction of the magnetic field by the calculation already described. In the third embodiment, since only one pedestal 6 is used as the pedestal, the plane size of the apparatus can be further reduced. Further, since the flux gate elements 11, 12, and 14 can be arranged apart from each other through the pedestal 2 without being in contact with each other, interference between the flux gate elements can be prevented.

It is a figure which shows the structure of the three-dimensional magnetic sensor element which concerns on Example 1 of this invention. It is a figure which shows the structure of the three-dimensional magnetic sensor element which concerns on Example 2 of this invention. It is a figure which shows the structure of the three-dimensional magnetic sensor element which concerns on Example 3 of this invention. It is a figure which shows the three-dimensional magnetic field detected by this invention. It is a figure explaining the state of arrangement | positioning of the fluxgate element used for this invention. It is a figure explaining the state of arrangement | positioning of the fluxgate element used for this invention. It is a figure explaining the method to detect the component of a magnetic field by this invention. It is a figure explaining the state of arrangement | positioning of the fluxgate element used for this invention. It is a figure explaining the state of arrangement | positioning of the fluxgate element used for this invention. It is a figure explaining the arrangement | positioning state of the fluxgate element in the conventional three-dimensional magnetic sensor. It is a figure explaining the magnetic field used as the detection object of the conventional three-dimensional magnetic sensor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 1st base 2b, 2c, 3b, 4b, 4c, 6b, 6c Side surface of a base 3 2nd base 4 3rd base 5 Control IC
6 Wide pedestal 6d Upper surface of pedestal 7 Element connection terminal 8 IC connection terminal 10, 20, 30 3D magnetic sensor element 11 First flux gate element 12 Second flux gate element
13 Third fluxgate element
14 Fluxgate element for top surface

Claims (3)

In a magnetic sensor element that detects a magnetic field in three dimensions using a fluxgate element,
A magnetic sensor element substrate arranged on a horizontal plane, a control IC fixed on the substrate, a pedestal arranged in a rectangular parallelepiped on the substrate and having a columnar shape in one direction, and fixed to a vertical side surface of the pedestal. A fluxgate element,
For at least one of the X-axis and Y-axis arranged on the horizontal plane, two fluxgate elements are used as a set, and each fluxgate element is inclined at a tilt angle in the range of 1 ° to 45 ° in the plus and minus directions with respect to the horizontal plane. While arranging with an inclination,
One fluxgate element of the two fluxgate elements as a set is inclined in the plus direction with respect to the horizontal plane, and the other fluxgate element is inclined in the minus direction with respect to the horizontal direction. The absolute value of the inclination angle in the minus direction is made equal, and the intensity of the magnetic field component in the X-axis or Y-axis direction is calculated using the sum of one fluxgate element and output and the other fluxgate element and output, and the output A magnetic sensor element comprising a computing means for calculating the intensity of a magnetic field component in the Z-axis direction orthogonal to the horizontal plane using the difference . The control IC is fixed between the first pedestal and the second pedestal to which the two fluxgate elements as a set are fixed, and the third pedestal to which the other fluxgate elements are fixed. 2. The magnetic sensor according to claim 1, wherein the magnetic sensor is arranged so as to be orthogonal to the first pedestal and the second pedestal, and the three pedestals are arranged so as to surround the control IC from three directions . The flux gate element as a set of the two is fixed to both side surfaces of the first pedestal, and the other flux gate element is fixed to a third pedestal arranged orthogonal to the first pedestal, The magnetic sensor according to claim 1, wherein a control IC is disposed inside an L-shape including the first pedestal and the third pedestal .

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