JP2009186231A - Apparatus for detecting moving object - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for detecting a moving object, which can detect not only movement information of a magnetic moving object but also positional information at a power-on timing. <P>SOLUTION: A projection part 11 of a first magnetic rotating body 10 and a recess part 22 of a second magnetic rotating body 20 are disposed on the approximately same position in the rotational direction of a shaft 1, such that their angles to the rotation axis O are equal to each other in the rotational direction. Moreover, a recess part 12 of the first magnetic rotating body 10 and a projection part 21 of the second magnetic rotating body 20 are disposed on the approximately same position in the rotational direction of the shaft 1, such that their angles to the rotation axis O are equal to each other in the rotational direction. A first Hall element H1 and a second Hall element H2 are arranged in parallel with the rotation axis O. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a technique for detecting position information of a magnetic material moving body from a magnetic field change accompanying the movement of the magnetic material moving body, and in particular, a magnetic material rotating body or a magnetic material straight line used in, for example, industrial machine tools and automobile engines. The present invention relates to a moving body detection apparatus suitable for use in detecting position information of a moving body.

As shown in Patent Document 1 below, a conventional moving body detection device has a pair of Hall elements (examples of magnetoelectric conversion elements) so as to face the outer peripheral surface of a magnetic material rotating body (soft magnetic rotating body) having irregularities. Are arranged in parallel with the tangent line of the magnetic material rotating body, and a bias magnetic field is applied from the back with a permanent magnet. According to this apparatus, it is possible to detect the rotational speed of the magnetic material rotating body from the differential signal of the output voltage of the pair of Hall elements. Also, the bias magnetic field applied to the pair of Hall elements has a strong and weak difference due to the soft magnetic material yoke, thereby preventing erroneous pulses from occurring due to overshoot and undershoot of the applied magnetic field. Is done.
JP 2004-340668 A (Proposed by the present applicant)

  In the conventional moving body detection device, the differential signal from the pair of Hall elements fluctuates when the unevenness switching portion of the magnetic material rotating body passes through the front surface of the pair of Hall elements, but the pair of Hall elements are both When facing the concave portion or convex portion of the magnetic material rotating body, the strength relationship of the applied magnetic field to the pair of Hall elements is the same. For this reason, in the conventional moving body detection apparatus, even if the rotation information of the magnetic material rotating body can be detected, the position information at the time of turning on the power (that is, the convex portion of the magnetic material rotating body is in front of the pair of Hall elements when the power is turned on. Or whether there is a recess). Such a problem is the same when a linear moving body such as a soft magnetic rack is a detection target.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a moving body detection apparatus capable of detecting not only movement information of a magnetic material moving body but also position information at power-on. It is in.

A first aspect of the present invention is a moving body detection apparatus. This device
First and second magnetic material moving parts each having at least one concavo-convex part and forming a magnetic material moving body that moves integrally;
Bias magnetic field generating means;
A first and a second magnetoelectric conversion element that are fixedly arranged with respect to the bias magnetic field generation unit and that change the applied magnetic field according to the positional relationship with the concavo-convex part,
When one of the first and second magnetoelectric conversion elements is present at or near a position facing the recess of the first magnetic material moving part, the other is a position facing the protrusion of the second magnetic material moving part. Or when it exists in the vicinity and one side exists in the position facing the convex part of the first magnetic material moving part or in the vicinity thereof, the other is in the position facing the concave part of the second magnetic material moving part or in the vicinity thereof. It is an existing arrangement.

The second aspect of the present invention is also a moving object detection device. This device
First and second magnetic material moving parts each having at least one concavo-convex part and forming a magnetic material moving body that moves integrally;
Bias magnetic field generating means;
A first and a second magnetoelectric conversion element that are fixedly arranged with respect to the bias magnetic field generation unit and that change the applied magnetic field according to the positional relationship with the concavo-convex part,
The first and second magnetic material moving parts are rotating bodies that rotate integrally with the same rotating shaft,
The convex part of the first magnetic material moving part and the concave part of the second magnetic material moving part have the same angle formed with the rotation axis with respect to the rotation direction, and exist at substantially the same position with respect to the rotation direction,
The concave part of the first magnetic material moving part and the convex part of the second magnetic material moving part have the same angle with the rotation axis with respect to the rotation direction, and are at substantially the same position with respect to the rotation direction.

  In the apparatus according to the second aspect, the concavo-convex portion may be present on an outer peripheral surface or an end surface of the first and second magnetic material moving portions.

The third aspect of the present invention is also a moving object detection device. This device
First and second magnetic material moving parts each having at least one concavo-convex part and forming a magnetic material moving body that moves integrally;
Bias magnetic field generating means;
A first and a second magnetoelectric conversion element that are fixedly arranged with respect to the bias magnetic field generation unit and that change the applied magnetic field according to the positional relationship with the concavo-convex part,
The first and second magnetic material moving parts are linear moving bodies that move linearly integrally,
The convex part of the first magnetic material moving part and the concave part of the second magnetic material moving part have the same length in the moving direction and are present at substantially the same position in the moving direction,
The concave portion of the first magnetic material moving portion and the convex portion of the second magnetic material moving portion have the same length in the moving direction and are present at substantially the same position in the moving direction.

  In the first to third aspects of the apparatus, one of the first and second magnetoelectric transducers is located on the first magnetic material moving part side, and the other is located on the second magnetic material moving part side. It is good to arrange them side by side.

The fourth aspect of the present invention is also a moving object detection device. This device
A magnetic material moving body having at least one uneven portion;
Bias magnetic field generating means;
A first magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means, is present at or near a position facing the uneven portion, and an applied magnetic field changes according to a positional relationship with the uneven portion;
A second magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means and is located at a position farther from the magnetic material moving part than the first magnetoelectric conversion element;
A soft magnetic material yoke disposed on the second magnetoelectric conversion element side and strengthening a magnetic field applied to the second magnetoelectric conversion element;
The magnitude relationship of the output voltages of the first and second magnetoelectric conversion elements varies depending on whether the first magnetoelectric conversion element is present at a position facing or near the concave portion or convex portion of the magnetic material moving portion. To do.

The fifth aspect of the present invention is also a moving object detection device. This device
A magnetic material moving body having at least one uneven portion;
Bias magnetic field generating means;
A first magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means, is present at or near a position facing the concavo-convex portion, and an applied magnetic field changes according to a positional relationship with the concavo-convex portion;
A second magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means and is located at a position farther from the magnetic material moving part than the first magnetoelectric conversion element,
The second magnetoelectric conversion element is disposed at a position closer to the bias magnetic field generating means than the first magnetoelectric conversion element;
The magnitude relationship of the output voltages of the first and second magnetoelectric conversion elements varies depending on whether the first magnetoelectric conversion element is present at a position facing or near the concave portion or convex portion of the magnetic material moving portion. To do.

  It should be noted that any combination of the above components is also effective as an aspect of the present invention.

  According to the present invention, the strength relationship of the applied magnetic field to the first and second magnetoelectric conversion elements varies depending on whether the first and second magnetoelectric conversion elements are facing the concave or convex portions of the magnetic material moving body. Since the magnitude relationship between the output voltages of the first and second magnetoelectric transducers changes, it becomes possible to detect not only the movement information of the magnetic material moving body but also the position information when the power is turned on.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

(First embodiment)
FIG. 1 is an exemplary schematic configuration diagram of a moving object detection apparatus 100 according to a first embodiment of the present invention, where (A) is a perspective view, (B) is a right side view, and (C) is a back surface. FIG.

  The moving body detection apparatus 100 includes a first magnetic material rotating body 10 that is an example of a first magnetic material moving unit, a second magnetic material rotating body 20 that is an example of a second magnetic material moving unit, and bias magnetic field generation means. An exemplary bias magnet 5 and a Hall IC 3 are provided. The Hall IC 3 includes a first Hall element H1 that is an example of a first magnetoelectric conversion element and a second Hall element H2 that is an example of a second magnetoelectric conversion element. A circuit diagram of the Hall IC 3 will be described later.

  The plate-shaped or columnar first magnetic material rotating body 10 and the second magnetic material rotating body 20 are integrated by a spacer 30 at a predetermined interval in the axial direction to form a magnetic material moving body, and exist in this state. The shaft 1 passes through the mounting hole 9. Accordingly, the first magnetic material rotating body 10 and the second magnetic material rotating body 20 rotate integrally with the rotation of the shaft 1.

  The outer peripheral surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20 vary in distance from the rotation axis O according to the angle around the rotation axis O (the center of the shaft 1). In other words, the first magnetic material rotating body 10 has a convex portion 11 whose distance from the rotation axis O is large and a concave portion 12 whose distance is small. Further, the second magnetic material rotating body 20 has a convex portion 21 whose distance from the rotation axis O is large and a concave portion 22 whose distance is small.

  The convex portion 11 of the first magnetic material rotating body 10 and the concave portion 22 of the second magnetic material rotating body 20 have substantially the same angle range from the rotation axis O with respect to the rotation direction of the shaft 1. Further, the concave range 12 of the first magnetic material rotating body 10 and the convex portion 21 of the second magnetic material rotating body 20 have substantially the same angular range from the rotation axis O with respect to the rotation direction of the shaft 1. That is, the convex portion 11 of the first magnetic material rotating body 10 and the concave portion 22 of the second magnetic material rotating body 20 have the same angle formed with the rotation axis O with respect to the rotation direction of the shaft 1 and substantially the same position with respect to the rotation direction. Exists. Further, the concave portion 12 of the first magnetic material rotating body 10 and the convex portion 21 of the second magnetic material rotating body 20 have the same angle with the rotation axis O with respect to the rotation direction of the shaft 1 and are located at substantially the same position with respect to the rotation direction. To do.

  The bias magnet 5 is a permanent magnet fixedly disposed so as to have an N pole on the surface facing the outer peripheral surface of the first magnetic material rotating body 10 and the second magnetic material rotating body 20 and an S pole on the opposite surface, for example. Preferably, the lateral width of the bias magnet 5 is larger than the arrangement width of the first Hall element H1 and the second Hall element H2 included in the Hall IC 3. Similarly, the total thickness of the first magnetic material rotating body 10, the spacer 30, and the second magnetic material rotating body 20 is also larger than the arrangement width of the first Hall element H1 and the second Hall element H2.

  The Hall IC 3 is fixedly disposed so as to be positioned between the N pole surface of the bias magnet 5 and the outer peripheral surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20. Preferably, in this state, in the first Hall element H1 and the second Hall element H2 included in the Hall IC 3, the first Hall element H1 is positioned on the first magnetic material rotating body 10 side, and the second Hall element H2 is the second Hall element H2. They are arranged side by side so as to be positioned on the magnetic material rotating body 20 side. Preferably, the first Hall element H1 and the second Hall element H2 further include the second Hall element H1 when the first Hall element H1 is present at a position facing (or in the vicinity of) the concave portion 12 of the first magnetic material rotating body 10. The element H2 is present at a position (or the vicinity thereof) facing the convex portion 21 of the second magnetic material rotating body 20, and the first Hall element H1 is positioned facing the convex portion 11 of the first magnetic material rotating body 10 (or When the second Hall element H2 is present in the vicinity thereof, the second Hall element H2 is disposed at a position facing (or in the vicinity of) the concave portion 22 of the second magnetic material rotating body 20. Such an arrangement is obtained when the first magnetic element rotating body 10 and the second magnetic material rotating body 20 are both parallel to the rotation axis O as shown in FIG. This is realized by arranging the Hall elements H2 in parallel with the rotation axis O.

  The magnetic field applied to the first Hall element H1 changes according to the positional relationship between the convex portion 11 and the concave portion 12 of the first magnetic material rotating body 10 (that is, the rotation of the first magnetic material rotating body 10), and the second Hall element The magnetic field applied to H2 changes according to the positional relationship between the convex portion 21 and the concave portion 22 of the second magnetic material rotating body 20 (that is, the rotation of the second magnetic material rotating body 20). That is, the magnetic field applied to the first Hall element H1 becomes large when the first Hall element H1 exists at a position (or in the vicinity thereof) facing the convex portion 11 of the first magnetic material rotating body 10, and When it exists in the position (or its vicinity) which opposes, it becomes small. Similarly, the magnetic field applied to the second Hall element H2 becomes large when the second Hall element H2 exists at a position (or in the vicinity thereof) facing the convex portion 21 of the second magnetic material rotating body 20, and the second Hall element H2 becomes large. When the element H2 is present at a position (or in the vicinity thereof) facing the concave portion 22 of the second magnetic material rotating body 20, the element H2 is small. The applied magnetic field means a magnetic field perpendicular to the magnetosensitive surface. The magnetic sensitive surfaces of the first Hall element H1 and the second Hall element H2 are preferably in the same plane parallel to the plane in contact with the outer peripheral surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20. To do.

  FIG. 2 is an exemplary circuit diagram of the Hall IC 3 shown in FIG. In this circuit, the first Hall element H1 and the second Hall element H2 are driven by a constant current by a first constant current source 811 and a second constant current source 822, respectively. Output voltages V1 and V2 from the first Hall element H1 and the second Hall element H2 are amplified by a first differential amplifier 801 and a second differential amplifier 802, respectively. The amplified output voltages Vamp1 and Vamp2 are compared with each other in magnitude by the comparator 810 and become a high level or low level signal Vcmp. The output signal Vcmp of the comparator 810 is input to the base of the transistor Q1. The collector of the transistor Q1 is an output terminal (open collector) of the Hall IC 3. The Hall IC 3 uses an IC whose signal level switches between high and low depending on which side of the differential threshold value of the first Hall element H1 and the second Hall element H2 is on the conversion threshold value of the comparator 810 when the power is turned on. .

  FIG. 3 shows a differential output signal obtained from a pair of Hall elements in the conventional mobile body detection device described in Patent Document 1, and the first Hall element H1 and the second Hall in the mobile body detection device of the present embodiment. It is a comparison figure with the differential output signal obtained from the element H2.

  As is apparent from this figure, in the conventional moving body detection apparatus, the differential output signal fluctuates when the unevenness switching portion of the magnetic material rotating body passes through the front surface of the pair of Hall elements, but the pair of Hall elements. When both elements are opposed to the concave or convex portions of the magnetic material rotating body, the strength relationship of the applied magnetic field to the pair of Hall elements is the same, and the differential output signal has a substantially constant value. For this reason, as described above, in the conventional moving body detection device, even if rotation information of the magnetic material rotating body can be detected, position information at the time of turning on the power (that is, the convex portion of the magnetic material rotating body on the front surface of the pair of Hall elements when the power is turned on) It is not possible to determine whether there is a recess or a recess.

  On the other hand, in the moving body detection device 100 of the present embodiment, the first Hall element H1 is present at a position (or in the vicinity thereof) facing the concave portion 12 of the first magnetic material rotating body 10 (hereinafter referred to as “first”). In the state), the second Hall element H2 is present at a position (or the vicinity thereof) facing the convex portion 21 of the second magnetic material rotating body 20, and the first Hall element H1 is the first magnetic material rotating body 10. In a state (hereinafter also referred to as “second state”) existing at a position facing the convex portion 11 (or in the vicinity thereof) (hereinafter also referred to as “second state”), the second Hall element H2 is positioned facing the concave portion 22 of the second magnetic material rotating body 20 (or Therefore, the strength of the magnetic field applied to the first Hall element H1 and the second Hall element H2 changes between the first and second states (that is, the first Hall element H1 and the second Hall element H2). Output voltage V1, V It becomes the magnitude of change) to the differential output signal Vd as is apparent from FIG. 3 is changed not constant value between the first and second state (zero crossing). Accordingly, the level of the output signal Vcmp of the comparator 810 is switched between the first and second states, whereby the level of the output signal Vout of the Hall IC 3 is also switched between the first and second states. Therefore, according to the moving body detection apparatus 100 of the present embodiment, the first and second states can be determined even when the power is turned on, and the first magnetic material rotating body 10 and the second magnetic material It is possible to detect not only the rotation information of the material rotating body 20 but also the position information when the power is turned on.

(Second Embodiment)
FIG. 4 is an exemplary schematic configuration diagram of a moving object detection apparatus 200 according to the second embodiment of the present invention, where (A) is a perspective view, (B) is a front view, and (C) is a right side view. FIG. Here, differences from the first embodiment will be mainly described, and the description of matching points will be omitted as appropriate.

  In the moving body detection apparatus 200 of the present embodiment, unlike the first embodiment, the first magnetic material rotating body 10 and the second magnetic material rotating body 20 are annular or cylindrical. The first magnetic material rotating body 10 has a small diameter, the second magnetic material rotating body 20 has a large diameter, and the first magnetic material rotating body 10 and the second magnetic material rotating body 20 are radially arranged by a spacer 30. Are integrated with a predetermined interval. Concavities and convexities exist on one end face of the first magnetic material rotating body 10 and the second magnetic material rotating body 20. Specifically, the thickness of the one side end surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20 varies depending on the angle around the rotation axis O. That is, the first magnetic material rotating body 10 includes a convex portion 11 having a large thickness and a concave portion 12 having a small thickness. Moreover, the 2nd magnetic material rotary body 20 has the convex part 21 in which thickness becomes large, and the recessed part 22 in which thickness becomes small.

  The bias magnet 5 is a permanent magnet that is fixedly disposed so as to have, for example, an N pole on a surface facing one end face of the first magnetic material rotating body 10 and the second magnetic material rotating body 20 and an S pole on the opposite surface. The Hall IC 3 is fixedly disposed so as to be positioned between the N pole surface of the bias magnet 5 and the one side end surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20. As shown in FIG. 4, when the concave / convex switching surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20 are both radial, the first Hall element H1 and the second Hall element H2 are directed toward the rotation axis O. And arrange them vertically. The magnetic sensitive surfaces of the first Hall element H1 and the second Hall element H2 are preferably in the same plane parallel to one end face of the first magnetic material rotating body 10 and the second magnetic material rotating body 20.

  This embodiment can also achieve the same effects as those of the first embodiment. In the first and second embodiments, the first magnetic material rotating body 10 and the second magnetic material rotating body 20 may be integrally formed without the spacer 30.

(Third embodiment)
FIG. 5 is an exemplary schematic configuration diagram of a moving object detection apparatus 300 according to the third embodiment of the present invention, where (A) is a perspective view, (B) is a right side view, and (C) is a back surface. FIG. Here, differences from the first embodiment will be mainly described, and the description of matching points will be omitted as appropriate.

  Unlike the first embodiment, the moving body detection apparatus 300 according to the present embodiment uses only one magnetic material rotating body 50 as an example of the magnetic material moving body. The magnetic material rotating body 50 has the same shape as the second magnetic material moving unit 20 in FIG. The first Hall element H1 is present at a position (or in the vicinity thereof) facing the convex portion 51 or the concave portion 52 of the magnetic material rotating body 50, and the second Hall element H2 is closer to the magnetic material rotating body 50 than the first Hall element H1. It exists in a distant position. The magnetic field applied to the first Hall element H1 and the second Hall element H2 changes according to the positional relationship between the convex portion 51 and the concave portion 52 of the magnetic material rotating body 50 (that is, the rotation of the magnetic material rotating body 50). Here, as described above, since the second Hall element H2 exists at a position farther from the magnetic material rotating body 50 than the first Hall element H1, the amount of change in the applied magnetic field is greater in the first Hall element H1 than in the second Hall element H1. Greater than H2.

  A soft magnetic material yoke 70 is disposed in front of the second Hall element H2 (on the magnetic material rotating body 50 side), and the magnetic field applied to the second Hall element H2 is strengthened. The degree of strengthening can be appropriately set depending on the material, size, and position of the soft magnetic material yoke 70. In the present embodiment, by providing the soft magnetic material yoke 70, when the first Hall element H1 is present at a position facing (or in the vicinity of) the concave portion 52 of the magnetic material rotating body 50, the second Hall element H2 is provided. Is stronger than the magnetic field applied to the first Hall element H1, and the second Hall is present when the first Hall element H1 is present at a position (or in the vicinity thereof) facing the convex portion 51 of the magnetic material rotating body 50. The magnetic field applied to the element H2 is made weaker than the magnetic field applied to the first Hall element H1. That is, according to the present embodiment, the first Hall element H1 depends on whether the first Hall element H1 is present at a position facing (or in the vicinity of) the convex portion 51 or the concave portion 52 of the magnetic material rotating body 50. The magnitude relationship between the output voltages of H1 and the second Hall element H2 (V1, V2 in FIG. 2) changes, and thereby the level of the output signal (Vout in FIG. 2) from the Hall IC 3 also changes. Therefore, according to the present embodiment, even when the power is turned on, the first Hall element H1 is present at a position (or in the vicinity thereof) facing the convex portion 51 or the concave portion 52 of the magnetic material rotating body 50. Thus, it is possible to detect not only the rotation information of the magnetic material rotating body 50 but also the position information when the power is turned on.

(Fourth embodiment)
FIG. 6 is an exemplary schematic configuration diagram of a moving object detection apparatus 400 according to the fourth embodiment of the present invention, where (A) is a right side view and (B) is a rear view. The moving body detection device 400 of the present embodiment is a surface in which the bias magnet 5 faces one end face of the magnetic material rotating body 50, as compared to the moving body detection device 300 of the third embodiment shown in FIG. The fixed arrangement is such that the Hall IC 3 is positioned between the N pole face of the bias magnet 5 and the one end face of the magnetic material rotating body 50 so as to have the N pole and the S pole on the opposite face. The difference is that the magnetosensitive surfaces of the first Hall element H1 and the second Hall element H2 are in the same plane parallel to one end face of the magnetic material rotating body 50, and the other points are the same. Yes. This embodiment can achieve the same effects as those of the third embodiment. In the third and fourth embodiments, the same effect can be obtained even if the soft magnetic material yoke 70 is disposed behind the second Hall element H2 (on the side opposite to the magnetic material rotating body 50).

(Fifth embodiment)
FIG. 7 is an exemplary schematic configuration diagram of a moving object detection apparatus 500 according to the fifth embodiment of the present invention, where (A) shows a first example and (B) shows a second example. Compared to the moving body detection apparatus 400 of the third embodiment shown in FIG. 5, the soft magnet yoke 70 is not used, and the second Hall element H2 is more biased than the first Hall element H1. It is different in that it is arranged at a position close to, and matches in other points. In order to realize such an arrangement, in the first example shown in FIG. 7A, the magnetic pole surface of the bias magnet 5 forms a predetermined angle with respect to the rotation axis O, and FIG. In the second example shown, the Hall IC 3 forms a predetermined angle with respect to the rotation axis O.

  In the present embodiment, the second Hall element H2 is disposed at a position closer to the bias magnet 5 than the first Hall element H1, so that the first Hall element H1 faces the recess 52 of the magnetic material rotating body 50 ( Or in the vicinity thereof, the magnetic field applied to the second Hall element H2 is stronger than the magnetic field applied to the first Hall element H1, and the first Hall element H1 faces the convex portion 51 of the magnetic material rotating body 50. The magnetic field applied to the second Hall element H2 is weaker than the magnetic field applied to the first Hall element H1. Therefore, as in the third embodiment shown in FIG. 5, even when the power is turned on, the position at which the first Hall element H1 faces either the convex portion 51 or the concave portion 52 of the magnetic material rotating body 50 (or In the vicinity thereof, it is possible to detect not only the rotation information of the magnetic material rotating body 50 but also the position information when the power is turned on.

(Sixth embodiment)
FIG. 8 is an exemplary schematic configuration diagram of a moving object detection apparatus 600 according to the sixth embodiment of the present invention, where (A) shows a first example and (B) shows a second example. The moving body detection device 600 of the present embodiment is a surface in which the bias magnet 5 faces one end face of the magnetic material rotating body 50, as compared to the moving body detection device 500 of the fifth embodiment shown in FIG. The fixed arrangement is such that the Hall IC 3 is positioned between the N pole face of the bias magnet 5 and the one end face of the magnetic material rotating body 50 so as to have the N pole and the S pole on the opposite face. It is different in the point that has been done, and is consistent in other points. The present embodiment can achieve the same effects as the fifth embodiment.

(Seventh embodiment)
FIG. 9 is an exemplary schematic configuration diagram of a moving object detection apparatus 700 according to the seventh embodiment of the present invention. The moving body detection apparatus 700 of the present embodiment is a magnetic material linear moving body (soft magnetic body) in which irregularities are arranged in a straight line as compared with the moving body detection apparatus 100 of the first embodiment shown in FIG. Since the point that the rack is a magnetic material moving body is mainly different, this point will be mainly described.

  The first magnetic material linear moving body 710 that is an example of the first magnetic material moving unit and the second magnetic material linear moving body 720 that is an example of the second magnetic material moving unit are set in a direction perpendicular to the moving direction by the spacer 730. For example, attached to a linearly moving part of a machine tool (not shown) and moved integrally with the linearly moving part. The first magnetic material linear moving body 710 and the second magnetic material linear moving body 720 change in height from the bottom surface according to the position in the moving direction. That is, the first magnetic material linear moving body 710 includes a convex portion 711 whose height from the bottom surface is large and a concave portion 712 whose height is small. The second magnetic material linear moving body 720 includes a convex portion 721 whose height from the bottom surface is large and a concave portion 722 whose height is small.

  The convex portion 711 of the first magnetic material linear moving body 710 and the concave portion 722 of the second magnetic material linear moving body 720 have substantially the same existence range in the movement direction. The existence range of the concave portion 712 of the first magnetic material linear moving body 710 and the convex portion 721 of the second magnetic material linear moving body 720 are substantially the same in the moving direction. That is, the convex portion 711 of the first magnetic material linear moving body 710 and the concave portion 722 of the second magnetic material linear moving body 720 have the same length in the moving direction and are substantially at the same position in the moving direction. Further, the concave portion 712 of the first magnetic material linear moving body 710 and the convex portion 721 of the second magnetic material linear moving body 720 are also equal in length in the moving direction and are present at substantially the same position in the moving direction.

  The bias magnet 5 is fixed so as to have, for example, an N pole on the surface facing the upper surface (surface on which the unevenness is formed) of the first linear moving body 710 and the second magnetic material linear moving body 720 and an S pole on the opposite surface. Be placed. The Hall IC 3 is fixedly disposed so as to be positioned between the N pole surface of the bias magnet 5 and the upper surfaces of the first linear moving body 710 and the second magnetic material linear moving body 720. The magnetic sensitive surfaces of the first Hall element H1 and the second Hall element H2 are preferably in the same plane parallel to the top surfaces of the first linear moving body 710 and the second magnetic material linear moving body 720.

  According to the present embodiment, for the same reason as in the first embodiment, not only the movement information of the first linear moving body 710 and the second magnetic material linear moving body 720 but also the position information at the time of power-on is detected. It becomes possible to do. In addition, regarding the second to sixth embodiments, the magnetic material linear moving body (soft magnetic material rack) in which irregularities are linearly arranged may be used as a magnetic material moving body instead of the magnetic material rotating body, In this case, the same effect can be obtained.

  The present invention has been described above by taking the embodiment as an example. However, it will be understood by those skilled in the art that various modifications can be made to each component of the embodiment within the scope of the claims. Hereinafter, modifications will be described.

  In the first embodiment, the description has been given of the case where the concave / convex switching surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20 are both parallel to the rotation axis O. As shown, the concave and convex switching surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20 may form a predetermined angle with the rotation axis O. In this case, the first Hall element H1 and the second Hall element H2 may be arranged so as to form the same predetermined angle with respect to the rotation axis O. That is, the first Hall element H1 and the second Hall element H2 are preferably arranged so as to be parallel to the unevenness switching surfaces of the first magnetic material rotating body 10 and the second magnetic material rotating body 20.

  In the first to sixth embodiments, the number of the concave portions and the convex portions of the magnetic material rotating body is one, but in the modification, the number of the concave portions and the convex portions may be two or more.

  In each of the embodiments, the case where the first Hall element H1 and the second Hall element H2 are included in the Hall IC 3 has been described. However, in a modified example, they may be discrete components.

  In each embodiment, the bias magnetic field generating means is a permanent magnet. However, an electromagnet can be used on the principle of operation.

BRIEF DESCRIPTION OF THE DRAWINGS It is an exemplary schematic block diagram of the moving body detection apparatus concerning the 1st Embodiment of this invention, (A) is a perspective view, (B) is a right view, (C) is a rear view. FIG. 2 is an exemplary circuit diagram of the Hall IC 3 shown in FIG. 1. A differential output signal obtained from a pair of Hall elements in the conventional mobile body detection device described in Patent Document 1, and a differential output obtained from the first and second Hall elements in the mobile body detection device of the present embodiment The comparison figure with a signal. It is the exemplary schematic block diagram of the moving body detection apparatus which concerns on the 2nd Embodiment of this invention, (A) is a perspective view, (B) is a front view, (C) is a right view. It is the exemplary schematic block diagram of the moving body detection apparatus which concerns on the 3rd Embodiment of this invention, (A) is a perspective view, (B) is a right view, (C) is a rear view. It is the exemplary schematic block diagram of the moving body detection apparatus which concerns on the 4th Embodiment of this invention, (A) is a right view, (B) is a rear view. It is an exemplary schematic block diagram of the moving body detection apparatus which concerns on the 5th Embodiment of this invention, (A) is a 1st example, (B) is a 2nd example. It is an exemplary schematic block diagram of the moving body detection apparatus which concerns on the 6th Embodiment of this invention, (A) is a 1st example, (B) is a 2nd example. The exemplary schematic block diagram of the mobile body detection apparatus which concerns on the 7th Embodiment of this invention. Regarding the modification of the first embodiment, the first and second holes when the unevenness switching surfaces of the first magnetic material rotating body and the second magnetic material rotating body are both at a predetermined angle with the rotation axis O. Element arrangement explanatory drawing.

Explanation of symbols

1 Shaft 3 Hall IC
5 Bias magnet 9 Through-hole 10 First magnetic material rotating body 20 Second magnetic material rotating body 11, 21 Convex parts 12, 22 Concave part 30 Spacer H1 First Hall element H2 Second Hall elements 100, 200,. Moving body detection device

Claims (7)

First and second magnetic material moving parts each having at least one concavo-convex part and forming a magnetic material moving body that moves integrally;
Bias magnetic field generating means;
A first and a second magnetoelectric conversion element that are fixedly arranged with respect to the bias magnetic field generation unit and that change the applied magnetic field according to the positional relationship with the concavo-convex part,
When one of the first and second magnetoelectric conversion elements is present at or near a position facing the recess of the first magnetic material moving part, the other is a position facing the protrusion of the second magnetic material moving part. Or when it exists in the vicinity and one side exists in the position facing the convex part of the first magnetic material moving part or in the vicinity thereof, the other is in the position facing the concave part of the second magnetic material moving part or in the vicinity thereof. A moving body detection device that is an existing arrangement. First and second magnetic material moving parts each having at least one concavo-convex part and forming a magnetic material moving body that moves integrally;
Bias magnetic field generating means;
A first and a second magnetoelectric conversion element that are fixedly arranged with respect to the bias magnetic field generation unit and that change the applied magnetic field according to the positional relationship with the concavo-convex part,
The first and second magnetic material moving parts are rotating bodies that rotate integrally with the same rotating shaft,
The convex part of the first magnetic material moving part and the concave part of the second magnetic material moving part have the same angle formed with the rotation axis with respect to the rotation direction, and exist at substantially the same position with respect to the rotation direction,
The moving body in which the concave portion of the first magnetic material moving portion and the convex portion of the second magnetic material moving portion have the same angle with the rotation axis with respect to the rotation direction and are substantially at the same position with respect to the rotation direction. Detection device.   The apparatus according to claim 2, wherein the concavo-convex portion is present on an outer peripheral surface or an end surface of the first and second magnetic material moving portions. First and second magnetic material moving parts each having at least one concavo-convex part and forming a magnetic material moving body that moves integrally;
Bias magnetic field generating means;
A first and a second magnetoelectric conversion element that are fixedly arranged with respect to the bias magnetic field generation unit and that change the applied magnetic field according to the positional relationship with the concavo-convex part,
The first and second magnetic material moving parts are linear moving bodies that move linearly integrally,
The convex part of the first magnetic material moving part and the concave part of the second magnetic material moving part have the same length in the moving direction and are present at substantially the same position in the moving direction,
The concave part of the first magnetic material moving part and the convex part of the second magnetic material moving part have the same length in the moving direction and are present at substantially the same position in the moving direction.   5. The apparatus according to claim 1, wherein one of the first and second magnetoelectric transducers is located on the first magnetic material moving unit side, and the other is on the second magnetic material moving unit side. A moving body detection device arranged side by side so as to be positioned. A magnetic material moving body having at least one uneven portion;
Bias magnetic field generating means;
A first magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means, is present at or near a position facing the uneven portion, and an applied magnetic field changes according to a positional relationship with the uneven portion;
A second magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means and is located at a position farther from the magnetic material moving part than the first magnetoelectric conversion element;
A soft magnetic material yoke disposed on the second magnetoelectric conversion element side and strengthening a magnetic field applied to the second magnetoelectric conversion element;
The magnitude relationship of the output voltages of the first and second magnetoelectric conversion elements varies depending on whether the first magnetoelectric conversion element is present at a position facing or near the concave portion or convex portion of the magnetic material moving portion. A moving body detection device. A magnetic material moving body having at least one uneven portion;
Bias magnetic field generating means;
A first magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means, is present at or near a position facing the uneven portion, and an applied magnetic field changes according to a positional relationship with the uneven portion;
A second magnetoelectric conversion element that is fixedly arranged with respect to the bias magnetic field generation means and is located at a position farther from the magnetic material moving part than the first magnetoelectric conversion element,
The second magnetoelectric conversion element is disposed at a position closer to the bias magnetic field generating means than the first magnetoelectric conversion element;
The magnitude relationship of the output voltages of the first and second magnetoelectric conversion elements varies depending on whether the first magnetoelectric conversion element is present at a position facing or near the concave portion or convex portion of the magnetic material moving portion. A moving body detection device.

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