JP2018066695A - Signal detector, signal detection method, and signal detection program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a signal detector with which it is possible to detect a rotation angle of a magnet that rotates in a plane, and a signal detection method and a signal detection program.SOLUTION: A signal detector 1 comprises: a hall element HEx1, being attached to a housing 4, and outputting a first detection signal SHx1 based on a magnetic field generated by a magnetic M attached to a lens holder 21 movable to the housing 4 in an XY coordinate plane; a hall element HEx2 being attached to the housing 4 and outputting a second detection signal SHx2 based on the magnetic field generated by the magnet M; a sum signal generation unit 11 generating a sum signal S+ of the first detection signal SHx1 and the second detection signal SHx2; and a calculation unit 16 calculating an angle θ of rotation of the magnet M to the hall elements HEx1, HEx2 in the XY coordinate plane on the basis of the sum signal S+ input from the sum signal generation unit 11.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a signal detection apparatus, a signal detection method, and a signal detection program for detecting a position control signal based on the strength of a magnetic field.

  In recent years, there have been increasing opportunities to take still images using a small camera provided in a mobile phone device or the like. Accordingly, even if there is a camera shake (vibration) when shooting a still image, an optical camera shake correction (OIS; Optical Image Stabilizer) that prevents a camera shake on the imaging surface and enables clear shooting. Hereinafter, various devices have been proposed (which may be abbreviated as “camera shake correction”) (for example, Patent Document 1). Such a camera shake correction device detects the magnetic field generated by a magnet fixed to a lens holder used in a small camera, for example, and controls the position of the lens holder.

  The lens holder is provided in a case of a mobile phone device or the like in a state where movement is restricted in three orthogonal directions by a predetermined stage or an elastic member. However, with the reduction in size and thickness of mobile phone devices and the like, it has become difficult to secure an area for providing such a stage and an elastic member. For this reason, since the lens holder is provided in the mobile phone device without being attached to the stage or the like, if camera shake occurs during shooting, in addition to the movement in the conventional three-axis direction, the conventional two-axis May rotate within the plane formed by. However, there is no method for accurately detecting the rotation angle when moving to two axes, and it is difficult to control the rotation. For this reason, the conventional camera shake correction apparatus has a problem that image blur due to rotation of the lens holder in this plane cannot be sufficiently corrected.

JP2015-1964660A

  An object of the present invention is to provide a signal detection device, a signal detection method, and a signal detection program that can detect the rotation angle of a magnet that rotates in a plane.

  In order to achieve the above object, a signal detection device according to an aspect of the present invention generates a magnet attached to a moving body that is movable with respect to a member in one direction and a plane orthogonal to the one direction. A first detection signal based on a magnetic field is output, and when the magnet approaches the first magnetic detection unit by rotating the first magnetic detection unit attached to the member and the moving body in the plane. Is attached to the member so that the magnet approaches when the magnet moves away from the first magnetic detection unit by rotating the moving body within the plane. A second magnetic detection unit that outputs a second detection signal based on the generated magnetic field, a sum signal generation unit that generates a sum signal of the first detection signal and the second detection signal, and the sum signal generation unit. Based on the sum signal Characterized in that it comprises a calculation unit for calculating a rotation angle in the plane of the magnet relative to the first magnetic detection portion and the second magnetic detection portion.

  According to one aspect of the present invention, the rotation angle of a magnet that rotates in a plane can be detected.

It is an external view which shows schematic structure of the camera module 2 of the position detection object of the signal detection apparatus 1 by 1st Embodiment of this invention, Fig.1 (a) is a perspective view of the camera module 2, FIG.1 (b) FIG. 3 is a plan view of the camera module 2. It is a block diagram which shows schematic structure of the signal detection apparatus 1 by 1st Embodiment of this invention. It is a block diagram which shows schematic structure of the signal detection apparatus 3 by 2nd Embodiment of this invention. It is a block diagram which shows schematic structure of the signal detection apparatus 5 by 3rd Embodiment of this invention. It is a block diagram which shows schematic structure of the signal detection apparatus 7 by 4th Embodiment of this invention.

[First Embodiment]
A signal detection apparatus and a signal detection method according to a first embodiment of the present invention will be described with reference to FIGS. The signal detection apparatus 1 according to the present embodiment is provided in the electronic device 100 with a camera function. The electronic device 100 with a camera function in the present embodiment is, for example, a mobile phone device such as a smartphone, a digital camera, a digital movie, or the like.

  FIGS. 1A and 1B are a perspective view (FIG. 1A) and a plan view (FIG. 1B) showing a schematic configuration of a camera module 2 provided in the electronic device 100 with a camera function. In FIG. 1A, for ease of understanding, the illustration of the housing 4 (details will be described later) to which Hall elements HEEx1, HEEx2, HEy, and HEz (details will be described later) are attached is omitted. 1A and 1B show an XYZ orthogonal coordinate system associated with the camera module 2 for convenience of explanation.

  As shown in FIG. 1, the camera module 2 includes a thin plate rectangular lens holder (an example of a moving body) 21 and a lens 22 attached to a through hole formed at the center of the lens holder 21. . The lens holder 21 is provided in a holder mounting portion 41 (see FIG. 1B) of a housing (an example of a member) 4 provided in the electronic device 100 with a camera function. The lens holder 21 is provided so as to be movable with respect to the housing 4 at the holder mounting portion 41.

  The camera module 2 has a magnet M provided on at least a part of the periphery of the lens holder 21. The magnet M includes a magnet Mx, a magnet My, and a magnet Mz. The magnets Mx and My are attached to the side surface of the lens holder 21. The magnet My is disposed on a side surface orthogonal to the side surface of the lens holder 21 on which the magnet Mx is disposed. The magnet Mz is disposed to face the magnet Mx with the lens holder 21 interposed therebetween. The magnet Mz is provided in the holder mounting portion 41 so that the distance from the Hall element HEz is kept constant even when the lens holder 21 moves in the holder mounting portion 41 provided in the housing 4. The magnet Mz has a structure that holds the lens holder 21 from the outside. The magnet Mz and the lens holder 21 are movable independently of each other.

  As shown in FIG. 1B, the hall elements HEEx1, HEEx2, HEy, and HEz are attached to the housing 4. Hall element HEEx1 (an example of a first magnetic detection unit) and Hall element HEEx2 (an example of a second magnetic detection unit) are disposed to face magnet Mx. The Hall element HEy (an example of the third magnetic detection unit) is disposed to face the magnet My. The Hall element HEz (an example of a fourth magnetic detection unit) is disposed to face the magnet Mz.

  A coil Cx1 disposed opposite to the magnet Mx is provided around the hall element HEEx1. A current based on a detection signal detected by the hall element HEx1 is supplied to the coil Cx1. A coil Cx2 disposed to face the magnet Mx is provided around the hall element HEx2. The coil Cx2 and the coil Cx1 are disposed adjacent to each other. A current based on a detection signal detected by the Hall element HEx2 is supplied to the coil Cx2. A coil Cy disposed opposite to the magnet My is provided around the Hall element HEy. A current based on a detection signal detected by the Hall element HEy is supplied to the coil Cy. Around the hall element HEz, a coil Cz disposed opposite to the magnet Mz is provided. A current based on a detection signal detected by the Hall element HEz is supplied to the coil Cz.

  The magnets Mx, My, and Mz have a thin plate rectangular parallelepiped shape. The magnet Mx and the magnet Mz are formed larger than the magnet My. The magnets Mx and My are permanent magnets having one N pole and one S pole. The magnet Mx is arranged with the south pole distributed on the lens holder 21 side and the north pole distributed on the hall element HEx1 side. The magnet My is arranged with the S pole distributed on the lens holder 21 side and the N pole distributed on the Hall element HEy side. The magnet Mz is a permanent magnet having two N poles and two S poles. The magnet Mz is arranged with the south pole and the north pole arranged in the short side direction distributed on both the lens holder 21 side and the hall element HEz side. The S poles on the lens holder 21 side and the Hall element HEz side are distributed diagonally, and the N poles on the lens holder 21 side and the Hall element HEz side are distributed diagonally. The magnets Mx, My, Mz may have N poles and S poles distributed in the opposite manner to that shown in FIG. In this configuration, one magnet Mx, My, and Mz is provided, but there is no problem even if there are a plurality of magnets Mx, My, and Mz.

  The lens holder 21 and the magnets Mx and My are provided so as to be movable relative to the housing 4 in the holder mounting portion 41. The signal detection device 1 to be described later detects the moving amount and moving direction of the magnets Mx, My, and Mz based on the detection signals of the hall elements HEEx1, HEEx2, HEy, and HEz, and detects the magnet Mx, Signals for suppressing the movement of My, Mz and the lens holder 21 are output. Further, the magnet Mz may be used for detecting the position of the lens 22 in the optical axis direction of the lens 22 for focus adjustment. In this configuration, sensors such as Hall elements HEEx1, HEEx2, HEy, and HEz are mounted on the casing 4, and the magnets Mx, My, and Mz are mounted on the lens holder 21, but there is no problem even if this is reversed.

  As shown in FIGS. 1A and 1B, at the reference position (design value) of the lens holder 21, the Z-axis direction (an example of one direction) of the XYZ orthogonal coordinate system in the optical axis direction of the lens 22 Are associated. Further, at the reference position of the lens holder 21, an XY coordinate plane is associated with a plane orthogonal to the optical axis direction of the lens 22. Further, the X-axis direction is associated with the direction in which the Hall elements HEEx1 and HEEx2 and the Hall element HEz are arranged. In other words, the X-axis direction is associated with the direction in which the long side of the magnet My extends. The direction from the Hall element HEx side to the Hall element HEz side is the positive direction of the X axis. Furthermore, the Y-axis direction is associated with the direction in which the Hall element HEEx1 and the Hall element HEEx2 are arranged. In other words, the Y-axis direction is associated with the direction in which the long side of the magnet Mx extends. The direction from the hall element HEy side toward the side wall side of the lens holder 21 where no hall element is provided is the positive direction of the Y axis.

  Next, a schematic configuration of the signal detection apparatus 1 according to the present embodiment will be described with reference to FIG. 1 and FIG. In FIG. 2, for easy understanding, a control unit 6 connected to the signal detection device 1, a drive unit 8 controlled by the control unit 6, and coils Cx 1, Cx 2, Cy, Cz driven by the drive unit 8 are shown. It is also illustrated.

  As shown in FIG. 2, the signal detection device 1 includes a Z-axis direction of an XYZ orthogonal coordinate system and a magnet M (see FIG. 1) that can move with respect to the housing 4 in an XY coordinate plane orthogonal to the Z-axis direction. A hall element HEx1 that detects the first detection signal SHx1 based on the magnetic field generated by the attached magnet Mx is provided. Further, in the signal detection apparatus 1, when the lens holder 21 (see FIG. 1) rotates in the XY coordinate plane, when the magnet Mx approaches the Hall element HEx1, the magnet Mx moves backward and the lens holder 21 moves to the XY coordinate. When the magnet Mx moves away from the Hall element HEx1 by rotating in a plane, the magnet Mx is attached to the housing 4 so as to approach and outputs a second detection signal SHx2 based on the magnetic field generated by the magnet Mx. An element HEEx2 is provided. In this case, when the lens holder 21 is translated in the X-axis direction within the XY coordinate plane, the magnet Mx moves in the same direction relative to the Hall element HEEx1 and the Hall element HEEx2.

When the rotation angle of the lens holder 21 is sufficiently small, the first detection signal SHx1 output from the Hall element HEx1 can be expressed by the following equation (1), and the second detection signal SHx2 output from the Hall element HEx2 is expressed by the following equation: (2).
SHx1 = B × (α × x + 1) × sin θ + B0 × (α × x + 1)
+ B × (α × x + 1) × (β × y + 1)
+ B × (α × x + 1) × (γ × z + 1) × sin θ (1)
SHx2 = −B × (α × x + 1) × sin θ + B0 × (α × x + 1)
−B × (α × x + 1) × (β × y + 1)
−B × (α × x + 1) × (γ × z + 1) × sin θ (2)

  Equations (1) and (2) are approximately expressed in terms of first-order terms, but in some cases, higher-order terms or other functions and tables are used to move in the X-axis direction, Y-axis direction, and Z-axis direction. You may express the influence of In addition, although the offset term is expressed as +1 when expressed in the first order, there is no problem even if it is an offset term including 0 which is optimum in each environment.

  In Expression (1), “B” is a reference value (design value) of the magnetic flux density of the magnetic field generated by the magnet Mx detected by the Hall element HEx1 when the lens holder 21 (that is, the magnet M) is present at the reference position. Represents. “Α” represents the rate of change of the magnetic field generated by the magnet Mx when the relative distance between the Hall element HEEx1 and the magnet Mx is shifted from the reference position in the X-axis direction. “X” represents the amount of deviation in the X-axis direction from the reference position of the relative distance between the Hall element HEEx1 and the magnet Mx. “B0” represents an offset amount included in the detection signal detected by the Hall element HEEx1.

  In equation (1), “θ” represents the rotation angle from the reference position of the magnets Mx, My, Mz (that is, the lens holder 21 (see FIG. 1)), that is, the tilt angle (tilt angle) with respect to the reference position. ing. “Β” represents the rate of change of the magnetic field generated by the magnet My when the relative distance between the Hall element HEy and the magnet My deviates from the reference position in the Y-axis direction. “Y” represents the amount of deviation of the relative distance between the hall element HEy and the magnet My from the reference position in the Y-axis direction. “Γ” represents the rate of change of the magnetic field generated by the magnet Mz when the relative distance between the Hall element HEz and the magnet Mz is shifted from the reference position in the Z-axis direction. “Z” represents the amount of deviation in the Z-axis direction from the reference position of the relative distance between the hall element HEz and the magnet Mz.

  In Expression (2), “B” represents a reference value (design value) of the magnetic flux density of the magnetic field generated by the magnet Mx detected by the Hall element HEx2 when the lens holder 21 (that is, the magnet M) is present at the reference position. Represents. “Α” represents the rate of change of the magnetic field generated by the magnet Mx when the relative distance between the Hall element HEx2 and the magnet Mx deviates from the reference value in the X-axis direction. “X” represents an amount of deviation in the X-axis direction from the reference position of the relative distance between the hall element HEEx2 and the magnet Mx. “B0” represents an offset amount included in the detection signal detected by the Hall element HEEx2. Each term has an offset of +1, but depending on the configuration of the magnet M, it may be unnecessary.

  In the equation (2), “θ” represents the rotation angle from the reference position of the magnets Mx, My, Mz (that is, the lens holder 21 (see FIG. 1)), that is, the tilt angle (tilt angle) with respect to the reference position. ing. “Β” represents the rate of change of the magnetic field generated by the magnet My when the relative distance between the Hall element HEy and the magnet My deviates from the reference position in the Y-axis direction. “Y” represents the amount of deviation of the relative distance between the hall element HEy and the magnet My from the reference position in the Y-axis direction. “Γ” represents the rate of change of the magnetic field generated by the magnet Mz when the relative distance between the Hall element HEz and the magnet Mz is shifted from the reference position in the Z-axis direction. “Z” represents the amount of deviation in the Z-axis direction from the reference position of the relative distance between the hall element HEz and the magnet Mz.

  The signal detection device 1 cannot be detected by a conventional camera shake correction device, and the lens holder 21 when the lens holder 21 moves and rotates in at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction. The rotation angle θ can be calculated.

  As shown in FIG. 1, the magnet Mx is fixed to the lens holder 21, and the hall element HEEx <b> 1 and the hall element HEx <b> 2 face the magnet Mx and are arranged next to each other. For this reason, when the lens holder 21 is moved by the distance x in the positive direction of the X axis with respect to the reference position, the relative distance between the Hall element HEEx1 and the Hall element HEEx2 and the magnet Mx is increased by the distance x. Further, when the lens holder 21 is moved by the distance x in the negative direction of the X axis with respect to the reference position, the relative distance between the Hall element HEEx1 and the Hall element HEEx2 and the magnet Mx is shortened by the distance x. Further, when the lens holder 21 rotates by the rotation angle θ with respect to the reference position in the XY coordinate plane, the relative distance between the Hall element HEEx1 and the magnet Mx becomes shorter (longer) by a distance proportional to sin θ, whereas The relative distance between the element HEEx2 and the magnet Mx becomes longer (shorter) by a distance proportional to sin θ. Thus, when the lens holder 21 is rotated in the XY coordinate plane, the relative positional relationship between the Hall element HEEx1 and the magnet Mx and the relative positional relationship between the Hall element HEEx2 and the magnet Mx are opposite to each other. As shown in (1) and Equation (2), the first detection signal SHx1 and the second detection signal SHx2 are absolute values except for the offset component (B0 × (α × x + 1) term). Are the same.

  Returning to FIG. 2, the signal detection apparatus 1 includes a sum signal generation unit 11 that generates a sum signal of the first detection signal SHx1 and the second detection signal SHx2. One of the two input terminals of the sum signal generation unit 11 is connected to the output terminal of the Hall element HEEx1. The other of the two input terminals of the sum signal generation unit 11 is connected to the output terminal of the Hall element HEEx2.

  The signal detection device 1 includes a calculation unit 16 that calculates the rotation angle of the magnet Mx in the XY coordinate plane with respect to the Hall element HEEx1 and the Hall element HEEx2 based on the sum signal S + input from the sum signal generation unit 11. Yes. The configuration of the calculation unit 16 will be described later.

  The signal detection apparatus 1 includes a difference signal generation unit 12 that generates a difference signal S− between the first detection signal SHx1 and the second detection signal SHx2. The output terminal of the Hall element HEEx1 is connected to one of the two input terminals of the difference signal generation unit 12. The other of the two input terminals of the difference signal generation unit 12 is connected to the output terminal of the Hall element HEEx2. When the first detection signal SHx1 and the second detection signal SHx2 are input to the difference signal generation unit 12, the same detection signals as the first detection signal SHx1 and the second detection signal SHx2 input to the difference signal generation unit 12 Input to the sum signal generator 11 is almost simultaneously.

When approximated as “sin θ = θ (θ≈0)” in the equations (1) and (2), the sum signal S + and the difference signal S− are expressed by the following equation (3) from the equations (1) and (2). ) And formula (4).
S + = SHx1 + SHx2
= 2 × B0 × (α × x + 1) (3)
S- = SHx1-SHx2
= 2 × B × (α × x + 1) × θ
+ 2 × B × (α × x + 1) × (β × y + 1)
+ 2 × B × (α × x + 1) × γ × z × θ (4)

  Here, when the magnet M does not move in the X-axis, Y-axis and Z-axis directions (x = y = z = 0) with respect to the Hall elements HEEx1, HEx2, the difference signal S is obtained from the equation (4). − Is “2 × B × θ”. The magnetic flux density B is the magnetic flux density of the magnetic field detected by the Hall elements HEEx1 and HEEx2 when the magnet M is disposed at the reference position with respect to the Hall elements HEEx1 and HEEx2. That is, the magnetic flux density B is a reference value (design value) and is known. For this reason, by substituting the value of the difference signal S− and the value of the magnetic flux density B into the equation (4), the XY coordinate plane of the magnet M (that is, the lens holder 21) with respect to the Hall elements HEEx1 and HEx2 (that is, the housing 4). The rotation angle θ can be calculated.

  On the other hand, when the magnet M moves in at least one of the X-axis, Y-axis, and Z-axis directions with respect to the Hall elements HEEx1 and HeEx2 and rotates in the XY coordinate plane, as shown in Expression (4) The difference signal S− includes a component related to the X-axis direction (B × (α × x + 1)), a component related to the Y-axis direction (B × (β × y + 1)), and a component related to the Z-axis direction (B × (γ × z). Xθ)). The change rates α, β, and γ are unknown numbers. For this reason, when the magnet M moves in at least one of the X-axis, Y-axis, and Z-axis directions with respect to the Hall elements HEEx1, HEx2, and rotates in the XY coordinate plane, the magnet M (ie, the lens) The rotation angle θ of the holder 21) cannot be calculated from the difference signal S− alone.

  Therefore, the signal detection device 1 removes the component related to the X-axis direction included in the difference signal S− using the sum signal S +, and the Hall element HEy detects the component related to the Y-axis direction included in the difference signal S−. A signal SHy (details will be described later) is removed, and a component relating to the Z-axis direction included in the difference signal S- is removed using a Z signal SHz (details will be described later) detected by the Hall element HEz. ing.

  As shown in FIG. 2, the signal detection device 1 includes an X signal (first signal) based on the movement of the magnet Mx in the X-axis direction (an example of the first direction) that approaches or moves away from the Hall element HEEx1 in the XY coordinate plane. An example of one signal) An X-direction coefficient calculation unit (an example of a first coefficient calculation unit) 13 that calculates an X-direction coefficient (an example of a first coefficient) Kx related to SHx using a sum signal S + is provided. The input terminal of the X direction coefficient calculation unit 13 is connected to the output terminal of the sum signal generation unit 11. Thereby, the sum signal S + output from the sum signal generation unit 11 is input to the X direction coefficient calculation unit 13.

  The X signal SHx corresponds to “B × (α × x + 1)” included in the equations (1) and (2). That is, the X signal SHx includes the absolute value of the first detection signal SHx1 detected by the Hall element HEx1 and the first value detected by the Hall element HEx2 when the magnet M moves only in the X-axis direction (y = z = θ = 0). This signal is equal to the absolute value of the second detection signal SHx2. The X-direction coefficient Kx corresponds to “α × x + 1” shown in Expressions (1) to (4). Since “B0” is known, the X direction coefficient calculation unit 13 can calculate the X direction coefficient Kx from the sum signal S +.

  The signal detection device 1 is attached to the housing 4 to detect the strength of the magnetic field of the magnet My, and the magnet My in the Y-axis direction (an example of the second direction) that is a direction orthogonal to the X-axis direction in the XY coordinate plane. A hall element HEy that outputs a Y signal based on movement (an example of a second signal) SHy is provided. The rotation component included in the Y signal SHy with the rotation of the magnet My in the XY coordinate plane is compared with the rotation component included in the first detection signals SHx1 and SHx2 with the rotation of the magnet Mx in the XY coordinate plane. It is extremely small. For this reason, in the present embodiment, the rotation component included in the Y signal SHy is ignored. Therefore, the Y signal SHy is a signal detected by the Hall element HEy when the magnet M moves only in the Y-axis direction. Therefore, the Y signal SHy corresponds to “B × (β × y + 1)” included in Equation (1), Equation (2), and Equation (4).

  The signal detection apparatus 1 includes a Y-direction coefficient calculation unit (second coefficient calculation unit) that calculates a Y-direction coefficient (an example of a second coefficient) Ky related to the Y signal SHy using the Y signal SHy input from the Hall element HEy. Example) 14 is provided. The input terminal of the Y-direction coefficient calculation unit 14 is connected to the output terminal of the Hall element HEy. Thereby, the Y signal SHy output from the Hall element HEy is input to the Y direction coefficient calculation unit 14. The Y-direction coefficient Ky corresponds to “β × y + 1” shown in equations (1) to (4). Since “B” is known, the Y-direction coefficient calculation unit 14 can calculate the Y-direction coefficient Ky from the Y signal SHy.

  The signal detection device 1 includes a hall element HEz that is attached to the housing 4 and detects the intensity of the magnetic field of the magnet Mz, and outputs a Z signal (an example of a third signal) SHz based on the movement of the magnet Mz in the Z-axis direction. ing. The rotation component included in the Z signal SHz with the rotation of the magnet Mz in the XY coordinate plane is compared with the rotation component included in the first detection signals SHx1 and SHx2 with the rotation of the magnet Mx in the XY coordinate plane. It is extremely small. For this reason, in this embodiment, the rotation component included in the Z signal SHz is ignored. Therefore, the Z signal SHz is a signal detected by the Hall element HEz when the magnet M moves only in the Z-axis direction. Therefore, the Z signal SHz corresponds to “B × (γ × z + 1)” included in the equations (1), (2), and (4).

  The signal detection apparatus 1 includes a Z-direction coefficient calculation unit (third coefficient calculation unit) that calculates a Z-direction coefficient (an example of a third coefficient) Kz related to the Z signal SHz using the Z signal SHz input from the Hall element HEz. An example) 15 is provided. The input terminal of the Z direction coefficient calculation unit 15 is connected to the output terminal of the Hall element HEz. Thereby, the Z signal SHz output from the hall element HEz is input to the Z direction coefficient calculation unit 15. The Z direction coefficient Kz corresponds to “γ × z + 1” shown in Expressions (1) to (4). Since “B” is known, the Z direction coefficient calculation unit 15 can calculate the Z direction coefficient Kz from the Z signal SHz.

  The calculation unit 16 included in the signal detection device 1 converts a part of the component (B × (α × x + 1)) related to the X direction included in the difference signal S− input from the difference signal generation unit 12 to X A component (B × (β × y + 1)) related to the Y direction included in the difference signal S− is removed from the Y direction coefficient calculation unit 14 by using the X direction coefficient Kx input from the direction coefficient calculation unit 13. It has a component removal pre-stage portion 161 that is removed using the input Y-direction coefficient Ky.

  Of the three input terminals of the component removal pre-stage unit 161, the output terminal of the X-direction coefficient calculation unit 13 is connected to the first terminal, the output terminal of the Y-direction coefficient calculation unit 14 is connected to the second terminal, The output terminal of the difference signal generator 12 is connected to the three terminals. As a result, the X-direction coefficient signal Skx output from the X-direction coefficient calculator 13 and including the information on the X-direction coefficient Kx and the Y-direction coefficient calculator 14 output to the component removal pre-stage unit 161 and information on the Y-direction coefficient Ky. Including the Y-direction coefficient signal Sky and the difference signal S− output from the difference signal generation unit 12. Since “B” is known, the component removal pre-stage unit 161 uses the X direction coefficient Kx included in the X direction coefficient signal Skx and the Y direction coefficient Ky included in the Y direction coefficient signal Sky to generate the difference signal S−. The component corresponding to the term “2 × B × (α × x + 1) × (β × y + 1)” to be configured is removed. The component removal pre-stage unit 161 outputs a calculation signal Sef, which is a calculation result signal from which components related to the X direction and the Y direction are removed, to the component removal post-stage unit 163 provided in the calculation unit 16.

  The calculation unit 16 calculates a component (B × γ × z) related to the Z direction included in the calculation signal Sef input from the component removal pre-stage unit 161 of the Z direction coefficient Kz input from the Z direction coefficient calculation unit 15. A component removal post-stage unit 163 that removes the information using the Z-direction coefficient signal Skz including information and the output signal So of the calculation unit 16 is provided.

  Of the four input terminals of the component removal post-stage unit 163, the output terminal of the X-direction coefficient calculation unit 13 is connected to the first terminal, the output terminal of the Z-direction coefficient calculation unit 15 is connected to the second terminal, The output terminal of the component removal pre-stage unit 161 is connected to the three terminals, and the output terminal of the calculation unit 16 is connected to the fourth terminal. As a result, the component removal post-stage unit 163 outputs the X-direction coefficient signal Skx output from the X-direction coefficient calculation unit 13 and the Z-direction coefficient signal Skz output from the Z-direction coefficient calculation unit 15 and includes information on the Z-direction coefficient Kz. The calculation signal Sef output from the component removal pre-stage unit 161 and the output signal So output from the calculation unit 16 are input.

  The component removal post-stage unit 163 uses the output signal So including information on the X-direction coefficient Kx included in the X-direction coefficient signal Skx, the Z-direction coefficient Kz included in the Z-direction coefficient signal Skz, and the rotation angle θ, before the component removal. A component corresponding to the term “2 × B × (α × x + 1) × γ × z × θ” included in the calculation signal Sef output from the unit 161 and constituting the difference signal S− is attenuated. More specifically, the component removal post-stage unit 163 feeds back the value of the rotation angle θ calculated by the calculation unit 16 and corresponds to the term “2 × B × (α × x + 1) × γ × z × θ”. Attenuate components The component removal post-stage unit 163 outputs a calculation signal Seb that is a signal of the calculation result and attenuates a component related to the Z direction to the division unit 165 provided in the calculation unit 16. The component removal post-stage unit 163 repeats the feedback process of feeding back the output signal So, so that the voltage value of the output signal So finally converges to the true value of the rotation angle θ.

  The calculation unit 16 includes a division unit 165 that divides the difference signal S− input from the difference signal generation unit 12 by the sum signal S + input from the sum signal generation unit 11. Of the two input terminals of the division unit 165, the component removal post-stage unit 163 is connected to one terminal, and the output terminal of the sum signal generation unit 11 is connected to the other terminal.

When the output signal So having the true value of the rotation angle θ is fed back, the calculation signal Seb output from the component removal post-stage unit 163 is derived from the difference signal S− output from the difference signal generation unit 12 in the X-axis direction and the Y-axis. The signal related to the direction and the Z-axis direction is removed. That is, the calculation signal Seb has the terms “2 × B × (α × x + 1) × (β × y + 1)” and “2 × B × (α × x + 1) × γ × z × θ” in Equation (4). It can be represented by the removed formula. Therefore, the signal output from the division unit 165, that is, the output signal So of the calculation unit 16, can be expressed by the following equation (5).
So = S− / S +
= (2 × B × (α × x + 1) × θ
+ 2 × B × (α × x + 1) × (β × y + 1)
+ 2 × B × (α × x + 1) × γ × z × θ)
/ (2 × B0 × (α × x + 1))
= (B / B0) × θ (5)
However, 2 × B × (α × x + 1) × (β × y + 1) = 0, 2 × B × (α × x + 1) × γ × z × θ) = 0.

  As shown in Expression (5), the output signal So output from the calculation unit 16 does not include the change rates α, β, and γ in the X-axis direction, the Y-axis direction, and the Z-axis direction, and includes only the rotation angle θ. It is. Since the magnetic flux density B and the offset amount B0 are known, the rotation angle θ can be obtained based on the output signal So.

Further, using only the condition of “2 × B × (α × x + 1) × (β × y + 1) = 0” and summarizing the equation (5), the output signal So can be expressed as the following equation (6). Can do.
So = S− / S +
= (2 × B × (α × x + 1) × θ
+ 2 × B × (α × x + 1) × (β × y + 1)
+ 2 × B × (α × x + 1) × γ × z × θ)
/ (2 × B0 × (α × x + 1))
= (B + B × γ × z) × θ / B0 (6)

  In Expression (6), “z” is calculated from a position sensor (Hall element HEz) in the Z-axis direction, and “γ” can be calculated from the output signal So if it is obtained in advance.

  As shown in FIG. 2, the electronic device 100 with a camera function includes a control unit 6 connected to the signal detection device 1 and a drive unit 8 connected to the control unit 6.

  The control unit 6 includes an X direction control unit 61 having an input terminal connected to the output terminal of the X direction coefficient calculation unit 13, a tilt control unit 63 having an input terminal connected to the output terminal of the calculation unit 16, and Y A Y-direction control unit 65 having an input terminal connected to the output terminal of the direction coefficient calculation unit 14 and a Z-direction control unit 67 having an input terminal connected to the output terminal of the Z-direction coefficient calculation unit 15 are provided. . As a result, the X direction coefficient signal Skx output from the X direction coefficient calculation unit 13 is input to the X direction control unit 61. The output signal So output from the calculation unit 16 is input to the tilt control unit 63. A Y direction coefficient signal Sky output from the Y direction coefficient calculation unit 14 is input to the Y direction control unit 65. The Z direction coefficient signal Skz output from the Z direction coefficient calculation unit 15 is input to the Z direction control unit 67.

  The X direction control unit 61 calculates the amount of movement of the lens holder 21 in the X direction from the reference position based on the input X direction coefficient signal Skx, and generates an X direction control signal Sxd. The tilt control unit 63 calculates the rotation angle θ of the lens holder 21 from the reference position based on the input output signal So, and generates a tilt control signal Sθ. The Y direction control unit 65 calculates the amount of movement of the lens holder 21 from the reference position in the Y direction based on the input Y direction coefficient signal Sky, and generates a Y direction control signal Syd. The Z direction control unit 67 calculates the amount of movement in the Z direction of the lens holder 21 from the reference position based on the input Z direction coefficient signal Skz, and generates a Z direction control signal Szd.

  The drive unit 8 includes a coil drive unit 81 having two input terminals connected to the output terminal of the X direction control unit 61 and the output terminal of the tilt control unit 63, and the output terminal and tilt control unit 63 of the X direction control unit 61. A coil driving unit 83 having two input terminals connected to the output terminal. The drive unit 8 includes a coil drive unit 85 having an input terminal connected to the output terminal of the Y direction control unit 65, and a coil drive unit 87 having an input terminal connected to the output terminal of the Z direction control unit 67. It has. As a result, the X direction control signal Sxd output from the X direction control unit 61 and the tilt control signal Sθ output from the tilt control unit 63 are input to the coil drive unit 81. The coil driving unit 83 receives an X direction control signal Sxd output from the X direction control unit 61 and a tilt control signal Sθ output from the tilt control unit 63. A Y direction control signal Syd output from the Y direction control unit 65 is input to the coil drive unit 85. A Z direction control signal Szd output from the Z direction control unit 67 is input to the coil drive unit 87.

  Based on the input X direction control signal Sxd and tilt control signal Sθ, the coil driving unit 81 determines the current amount and direction of the current supplied to the necessary coil Cx1 to return the lens holder 21 to the reference position. A current is supplied to the coil Cx1 connected to the output terminal. Based on the input X direction control signal Sxd and tilt control signal Sθ, the coil driving unit 83 determines the current amount and direction of the current supplied to the necessary coil Cx2 to return the lens holder 21 to the reference position. A current is supplied to the coil Cx2 connected to the output terminal. The coil drive unit 85 determines the amount and direction of the current supplied to the coil Cy required to return the lens holder 21 to the reference position based on the input Y direction control signal Syd, and is connected to the output terminal. A current is supplied to the coil Cy. The coil drive unit 87 determines the amount and direction of current to be supplied to the necessary coil Cz and return the lens holder 21 to the reference position based on the input Z direction control signal Szd, and is connected to the output terminal. A current is supplied to the coil Cz. As a result, even if camera shake occurs in the electronic device 100 with a camera function at the time of shooting, the positional shift of the lens holder 21 is suppressed, so that clear shooting can be performed while preventing image blur on the imaging plane.

Next, the signal detection method according to the present embodiment will be briefly described with reference to FIGS.
In the signal detection method according to the present embodiment, first, the first detection signal SHx1 based on the magnetic field generated by the magnet Mx attached to the lens holder 21 movable with respect to the housing 4 in the XY coordinate plane orthogonal to the Z-axis direction. Is output by the Hall element HEEx1. At this time, when the lens holder 21 rotates in the XY coordinate plane, when the magnet Mx approaches the Hall element HEx1, the magnet Mx moves far away, and the lens holder 21 rotates in the XY coordinate plane, thereby causing the magnet Mx to move. When moving away from the Hall element HEEx1, the Hall element HEx2 attached to the housing 4 so as to approach the magnet Mx outputs a second detection signal SHx2 based on the magnetic field generated by the magnet Mx. The timing at which the hall element HEEx1 outputs the first detection signal SHx1 and the timing at which the hall element HEx2 outputs the second detection signal SHx2 are substantially the same.

  In the signal detection method according to the present embodiment, the sum signal generation unit 11 generates the sum signal S + of the first detection signal SHx1 and the second detection signal SHx2, and based on the generated sum signal S +, the Hall elements HEx1 and The calculation unit 16 calculates the rotation angle θ in the XY coordinate plane of the magnet M with respect to the Hall element HEEx2. The calculation unit 16 calculates the rotation angle θ as described above.

  As described above, according to the signal detection device and the signal detection method according to the present embodiment, the magnet moves in at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction, and in the XY coordinate plane. Even if it is rotated, the rotation angle of the magnet rotating in the XY coordinate plane can be calculated. Thereby, according to the signal detection apparatus and signal detection method by this embodiment, the vibration by the camera shake etc. of the lens holder to which the magnet was fixed can be suppressed.

[Second Embodiment]
A signal detection apparatus and signal detection method according to a second embodiment of the present invention will be described with reference to FIG. The signal detection device 3 according to the present embodiment is provided in an electronic device with a camera function, like the signal detection device 1 according to the first embodiment. The electronic device 300 with a camera function in the present embodiment is a mobile phone device such as a smartphone, a digital camera, a digital movie, or the like, as in the first embodiment. Since the configuration of the camera module in the present embodiment is the same as that in the first embodiment, the signal detection device 3 according to the present embodiment will be described below with reference to FIG. 1 as appropriate. In addition, the same code | symbol is attached | subjected to the component which show | plays the same effect | action and function as the signal detection apparatus 1 by the said 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 3, the signal detection device 3 according to the present embodiment includes a calculation unit 17 having a configuration different from that of the calculation unit 16 in the first embodiment. The calculation unit 17 includes a component removal pre-stage unit 161 and a division unit 165. Further, the calculation unit 17 inputs a component (B × (γ × z × θ)) related to the Z-axis direction included in the calculation signal Sef input from the component removal pre-stage unit 161 from the Z direction coefficient calculation unit 15. The component removal post-stage unit 171 is removed using a Z direction coefficient signal Skz including information on the Z direction coefficient Kz and a predetermined value. Furthermore, the calculation unit 17 includes a predetermined value generation unit 173 that generates a predetermined value input to the component removal post-stage unit 171.

  Of the four input terminals of the component removal post-stage unit 171, the output terminal of the X-direction coefficient calculation unit 13 is connected to the first terminal, the output terminal of the Z-direction coefficient calculation unit 15 is connected to the second terminal, The output terminal of the component removal pre-stage unit 161 is connected to the three terminals, and the output terminal of the predetermined value generation unit 173 is connected to the fourth terminal. The component removal post-stage unit 171 is the same as the component removal post-stage unit 163 in the first embodiment except that the constant signal Sc output from the predetermined value generation unit 173 is input instead of the output signal So of the calculation unit 17. It has a configuration and exhibits the same function. The constant signal Sc is, for example, a signal having a predetermined voltage value and a constant signal level.

  The component removal post-stage unit 171 corresponds to this term by using the value of the constant signal Sc for θ in the term “2 × B × (α × x + 1) × γ × z × θ” constituting the difference signal S−. Remove ingredients. When a camera shake occurs after taking a photograph using the electronic device with camera function 300, the rotation angle θ of the magnet M (that is, the lens holder 21) in the XY coordinate plane is, for example, about 0 to 2 °. Therefore, the signal detection device 3 according to the present embodiment generates a constant signal Sc corresponding to, for example, 0 to 2 ° by the predetermined value generation unit 173 and inputs the constant signal Sc to the component removal post-stage unit 171. Accordingly, the component removal post-stage unit 171 converts the term “2 × B × (α × x + 1) × γ × z × θ” constituting the difference signal S− into the constant signal Sc and the X-direction coefficient signal Skx that are input. Are removed using the X-direction coefficient Kx included in the Z-direction coefficient Kz and the Z-direction coefficient Kz included in the Z-direction coefficient signal Skz. The calculation unit 17 divides the calculation signal Seb output from the component removal post-stage unit 171 and from which the term “2 × B × (α × x + 1) × γ × z × θ” is removed by the sum signal S + in the division unit 165. By doing so, “B / B0) × θ” shown in Expression (5) can be calculated.

  Since the signal detection method according to the present embodiment is the same as the signal detection method according to the first embodiment except that the processing in the component removal post-stage unit 171 is different, the description thereof is omitted.

  As described above, according to the signal detection device 3 and the signal detection method according to the present embodiment, the magnet M moves in at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction, and the XY coordinates. Even if it rotates in the plane, the rotation angle of the magnet rotating in the XY coordinate plane can be calculated. For this reason, the signal detection device 3 and the signal detection method according to the present embodiment can obtain the same effects as those of the signal detection device 1 and the signal detection method according to the first embodiment.

[Third Embodiment]
A signal detection apparatus and a signal detection method according to a third embodiment of the present invention will be described with reference to FIG. The signal detection device 5 according to the present embodiment is provided in an electronic device with a camera function, similarly to the signal detection device 1 according to the first embodiment. The electronic device 500 with a camera function in the present embodiment is a mobile phone device such as a smartphone, a digital camera, a digital movie, or the like, as in the first embodiment. In addition, since the configuration of the camera module in the present embodiment is the same as that in the first embodiment, hereinafter, the signal detection device 5 according to the present embodiment will be described with reference to FIG. 1 as appropriate. In addition, the same code | symbol is attached | subjected to the component which show | plays the same effect | action and function as the signal detection apparatus 1 by the said 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 5, the signal detection device 5 according to the present embodiment includes a calculation unit 18 having a configuration different from that of the calculation unit 16 in the first embodiment. The calculation unit 18 includes a component removal pre-stage unit 161 and a component removal post-stage unit 163. Further, the calculation unit 18 generates an X signal (first signal) based on the movement of the magnet M (magnet Mx) in the X-axis direction (an example of the first direction) that is a direction toward or away from the Hall element HEEx1 in the XY coordinate plane. An X-direction coefficient calculation unit 583 that calculates an X-direction coefficient (an example of a first coefficient) Kx related to (an example) using a sum signal S +. The X direction coefficient calculation unit 583 has the same configuration as the X direction coefficient calculation unit 13. Further, the calculation unit 18 removes a component related to the X-axis direction included in the difference signal S− input from the difference signal generation unit 12 using the X-direction coefficient Kx input from the X-direction coefficient calculation unit 583. And a removing portion 581 to be removed.

  The input terminal of the X direction coefficient calculation unit 583 is connected to the output terminal of the sum signal generation unit 11. Of the two input terminals of the removal unit 581, one terminal is connected to the output terminal of the X-direction coefficient calculation unit 583, and the other terminal is connected to the output terminal of the component removal post-stage unit 163. The calculation signal Seb output from the removal unit 581 becomes the output signal So of the calculation unit 18. The X direction coefficient calculation unit 583 outputs an X direction coefficient signal Skx including information on the X direction coefficient Kx to the removal unit 581 based on the input sum signal +. The removing unit 581 uses the input X-direction coefficient Kx (= α × x + 1) to calculate the arithmetic signal Seb (= (2 × B × (α × x + 1) × θ) input from the component removal post-stage unit 163. “Α × x + 1” is removed, and “(B / B0) × θ” shown in Expression (5) is calculated.

  The signal detection method according to the present embodiment is the same as the signal detection method according to the first embodiment except that the processing in the X-direction coefficient calculation unit 583 and the removal unit 581 is different, and thus description thereof is omitted.

  As described above, according to the signal detection device 5 and the signal detection method according to the present embodiment, the magnet M moves in at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction, and the XY coordinates. Even if it rotates in the plane, the rotation angle of the magnet rotating in the XY coordinate plane can be calculated. For this reason, the signal detection device 5 and the signal detection method according to the present embodiment can obtain the same effects as those of the signal detection device 1 and the signal detection method according to the first embodiment.

[Fourth Embodiment]
A signal detection apparatus and signal detection method according to a fourth embodiment of the present invention will be described with reference to FIG. Similarly to the signal detection device 1 according to the first embodiment, the signal detection device 7 according to the present embodiment is provided in an electronic device with a camera function. The electronic device 700 with a camera function in this embodiment is a mobile phone device such as a smartphone, a digital camera, a digital movie, or the like, as in the first embodiment. In addition, since the configuration of the camera module in the present embodiment is the same as that in the first embodiment, the signal detection apparatus 7 according to the present embodiment will be described below with reference to FIG. 1 as appropriate. In addition, the same code | symbol is attached | subjected to the component which show | plays the same effect | action and function as the signal detection apparatus by said 1st-3rd Embodiment 1,3,5, and the description is abbreviate | omitted.

  As shown in FIG. 5, the signal detection apparatus 7 according to the present embodiment includes a calculation unit 19 having a configuration different from that of the calculation unit 16 in the first embodiment. The calculation unit 19 includes a component removal pre-stage unit 161, a component removal post-stage unit 171, a predetermined value generation unit 173, an X-direction coefficient calculation unit 583, and a removal unit 581. The component removal post-stage unit 171 and the predetermined value generation unit 173 have the same configuration as the component removal post-stage unit 171 and the predetermined value generation unit 173 in the second embodiment, and exhibit the same functions. Further, the X-direction coefficient calculation unit 583 and the removal unit 581 have the same configuration as the X-direction coefficient calculation unit 583 and the removal unit 581 in the third embodiment, and exhibit the same functions.

  The component removal post-stage unit 171 performs the same processing as the component removal post-stage unit 171 in the second embodiment to calculate the operation signal Seb from which the term “2 × B × (α × x + 1) × γ × z × θ” has been removed. Is output to the removing unit 581. The removal unit 581 uses the X-direction coefficient Kx (= α × x + 1) input from the X-direction coefficient calculation unit 583 by the same processing as the removal unit 581 in the third embodiment to input the calculation signal Seb. “Α × x + 1” is removed from (= (2 × B × (α × x + 1) × θ) to calculate “B / B0) × θ” shown in Expression (5).

  The signal detection method according to the present embodiment is the same as the signal detection method according to the first embodiment except that the processing in the component removal post-stage unit 171, the X direction coefficient calculation unit 583, and the removal unit 581 is different. Is omitted.

  As described above, according to the signal detection device 7 according to the present embodiment, the magnet M moves in at least one of the X-axis direction, the Y-axis direction, and the Z-axis direction and rotates in the XY coordinate plane. Even so, the rotation angle of the magnet M rotating in the XY coordinate plane can be calculated. For this reason, the signal detection device 7 and the signal detection method according to the present embodiment can obtain the same effects as the signal detection device 1 and the signal detection method according to the first embodiment.

Next, signal detection programs according to the first to fourth embodiments will be described.
A part of the configuration of the signal detection devices 1, 3, 5, and 7 according to the first to fourth embodiments can be embodied as a computer program. For example, the function of each unit of the signal detection devices 1, 3, 5, and 7, more specifically, the sum signal generation unit 11, the difference signal generation unit 12, the X direction coefficient calculation unit 13, the Y direction coefficient calculation unit 14, and Z The functions of the direction coefficient calculation unit 15 and the calculation units 16, 17, 18, and 19 can be realized as a signal detection program. Thus, some or all of the present invention can be incorporated into hardware or software (including firmware, resident software, microcode, state machines, gate arrays, etc.). Furthermore, the present invention can take the form of a computer program product on a computer-readable storage medium that can be used by a computer (including a central processing unit for control provided in an electronic device with a camera function) This medium incorporates computer usable or computer readable program code. A computer usable or computer readable medium can record, store, communicate, propagate, or carry a program used by or in conjunction with an instruction execution system, apparatus or device, Any medium can be used.

The present invention is not limited to the first to fourth embodiments and can be variously modified.
The signal detection devices 3 and 7 according to the second and fourth embodiments have the X-direction coefficient calculation units 13 and 583, but the present invention is not limited to this. The signal detection devices 3 and 7 include either one of the X-direction coefficient calculation units 13 and 583, and the output terminals of one X-direction coefficient calculation unit are the component removal pre-stage unit 161, the component removal post-stage units 163 and 171 removal units. Even if connected to the respective input terminals of 581 and the X direction control unit 61, the same effects as those of the signal detection devices 3 and 7 according to the second and fourth embodiments can be obtained. Furthermore, since there is one X-direction coefficient calculation unit, the signal detection device can be downsized.

  The technical scope of the present invention is not limited to the illustrated and described exemplary embodiments, and includes all embodiments that provide an effect equivalent to the intended purpose of the present invention. Further, the technical scope of the present invention is not limited to the combinations of features of the invention defined by the claims, but is defined by any desired combination of specific features among all the disclosed features. sell.

1, 3, 5, 7 Signal detection device 2 Camera module 4 Housing 6 Control unit 8 Drive unit 11 Sum signal generation unit 12 Difference signal generation unit 13, 583 X direction coefficient calculation unit 14 Y direction coefficient calculation unit 15 Z direction coefficient Calculation unit 16, 17, 18, 19 Calculation unit 21 Lens holder 22 Lens 41 Holder mounting unit 61 X direction control unit 63 Tilt control unit 65 Y direction control unit 67 Z direction control units 81, 83, 85, 87 Coil driving unit 100 , 300, 500, 700 Electronic device with camera function 161 Component removal pre-stage unit 163, 171 Component removal post-stage unit 165 Division unit 173 Predetermined value generation unit 581 Removal unit HEEx1, HEx2, HEy, HEz Hall element M, Mx, My, Mz magnet

Claims (8)

A first detection signal based on a magnetic field generated by a magnet attached to a movable body that is movable relative to the member in one direction and a plane orthogonal to the one direction is output, and the first detection signal is attached to the member. A magnetic detector;
When the moving body rotates in the plane, the magnet moves away when the magnet approaches the first magnetic detection unit, and the moving body rotates in the plane causes the magnet to move in the first plane. A second magnetic detection unit that is attached to the member so as to approach the magnet when moving away from the one magnetic detection unit, and outputs a second detection signal based on a magnetic field generated by the magnet;
A sum signal generator for generating a sum signal of the first detection signal and the second detection signal;
A signal detection apparatus comprising: a calculation unit that calculates a rotation angle of the magnet in the plane with respect to the first magnetic detection unit and the second magnetic detection unit based on a sum signal input from the sum signal generation unit . A difference signal generator for generating a difference signal between the first detection signal and the second detection signal;
The signal detection device according to claim 1, wherein the calculation unit includes a division unit that divides the difference signal input from the difference signal generation unit by the sum signal input from the sum signal generation unit. A difference signal generator for generating a difference signal between the first detection signal and the second detection signal;
The calculation unit includes:
A first coefficient calculation that uses the sum signal to calculate a first coefficient related to a first signal based on the movement of the magnet in a first direction that approaches or moves away from the first magnetic detection unit in the plane. And
A removal unit that removes a component related to the first direction included in the difference signal input from the difference signal generation unit using the first coefficient input from the first coefficient calculation unit. The signal detection apparatus as described. A first coefficient calculation that uses the sum signal to calculate a first coefficient related to a first signal based on the movement of the magnet in a first direction that approaches or moves away from the first magnetic detection unit in the plane. And
A third magnetic detector that is attached to the member and detects the intensity of the magnetic field, and outputs a second signal based on movement of the magnet in a second direction that is perpendicular to the first direction in the plane;
A second coefficient calculation unit that calculates a second coefficient related to the second signal using the second signal input from the third magnetic detection unit;
The calculation unit removes a part of the component related to the first direction included in the difference signal input from the difference signal generation unit using the first coefficient input from the first coefficient calculation unit. The signal according to claim 2, further comprising: a component removal pre-stage unit that removes a component related to the second direction included in the difference signal by using the second coefficient input from the second coefficient calculation unit. Detection device. A fourth magnetic detector attached to the member and outputting a third signal based on the movement of the magnet in the one direction based on the magnetic field;
A third coefficient calculation unit that calculates a third coefficient related to the third signal using the third signal input from the fourth magnetic detection unit,
The calculation unit uses a component related to the one direction included in the signal input from the component removal pre-stage unit, using the third coefficient input from the third coefficient calculation unit and the output signal of the calculation unit. The signal detection device according to claim 4, further comprising: a component removal post-stage portion to be removed. A fourth magnetic detector attached to the member and outputting a third signal based on the movement of the magnet in the one direction based on the magnetic field;
A third coefficient calculation unit that calculates a third coefficient related to the third signal using the third signal input from the fourth magnetic detection unit,
The calculation unit removes a component related to the one direction included in the signal input from the component removal pre-stage using a third coefficient and a predetermined value input from the third coefficient calculation unit. The signal detection apparatus according to claim 4, further comprising a post-removal stage. A first detection signal based on a magnetic field generated by a magnet attached to a moving body that is movable relative to the member in one direction and a plane orthogonal to the one direction; Output,
When the moving body rotates in the plane, the magnet moves away when the magnet approaches the first magnetic detection unit, and the moving body rotates in the plane causes the magnet to move in the first plane. The second magnetic detection unit attached to the member so that the magnet approaches when it moves away from one magnetic detection unit outputs a second detection signal based on the magnetic field generated by the magnet,
Generating a sum signal of the first detection signal and the second detection signal;
A signal detection method for calculating a rotation angle of the magnet in the plane with respect to the first magnetic detection unit and the second magnetic detection unit based on the generated sum signal. Computer
A first detection signal based on a magnetic field generated by a magnet attached to a movable body that is movable relative to the member in one direction and a plane orthogonal to the one direction is output, and the first detection signal is attached to the member. Magnetic detector,
When the moving body rotates in the plane, the magnet moves away when the magnet approaches the first magnetic detection unit, and the moving body rotates in the plane causes the magnet to move in the first plane. A second magnetic detection unit that outputs a second detection signal based on the magnetic field generated by the magnet, attached to the member so that the magnet approaches when moving away from the one magnetic detection unit;
A sum signal generation unit that generates a sum signal of the first detection signal and the second detection signal, and the first magnetic detection unit and the second magnetic detection based on the sum signal input from the sum signal generation unit The signal detection program which functions as a calculation part which calculates the rotation angle in the said plane of the said magnet with respect to a part.

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