JP5099082B2 - Moving body detection device - Google Patents

Description

  The present invention relates to a detection device that detects a change in a magnetic field, and in particular, movement of a detected object that moves linearly or rotates, such as a rack or gear made of a soft magnetic material used in an engine of an industrial machine tool or an automobile, for example. The present invention relates to a moving body detection apparatus suitable for use in the case of magnetically detecting a state.

  A magnetic field was applied by a permanent magnet in order to magnetically detect the moving state of linearly moving or rotating objects such as racks and gears of soft magnetic materials used in industrial machine tools and automobile engines. There is a moving body detection device that uses a characteristic that an output signal of a magnetic sensitive element changes due to the proximity of a soft magnetic material to the magnetic sensitive element. As such a moving body detection apparatus, a structure in which a magnetic sensitive element, a permanent magnet, and a substrate on which electronic components are mounted is held by a holder, and the holder and a case for storing the holder are fitted and fixed is known. (See Patent Document 1 below).

Japanese Patent No. 3840489 Japanese Patent No. 3026295

  In the moving body detection apparatus described in Patent Document 1, the permanent magnet is bonded (temporarily fixed) to the holder with an adhesive, for example, and the movement in the vertical and horizontal directions is limited by the holder and the case. Here, since the adhesive for temporary fixing becomes ineffective when used in a high temperature environment, when a vibration or impact is applied to the apparatus, the permanent magnet is rattled. Absent. When the device is subjected to vibration or impact and a position shift occurs in the permanent magnet, there is a problem that the magnetic field applied to the magnetic sensing element fluctuates and an output error occurs. In addition, as shown in the above-mentioned Patent Document 2, a configuration in which a sealing body is filled and formed in a frame housing a magnetic conversion element, a magnet, or the like is also known. There are significant disadvantages in terms of workability.

  The present invention has been made in view of such a situation, and its purpose is to suppress the displacement of the permanent magnet when a vibration or impact is applied without sealing the permanent magnet with a sealing body. An object of the present invention is to provide a highly reliable moving object detection device.

One embodiment of the present invention is a moving object detection apparatus. This mobile object detection device
A magnetic sensitive element;
A permanent magnet for applying a magnetic field to the magnetically sensitive element;
A holding member for holding the magnetically sensitive element and the permanent magnet;
The holding member has a magnet insertion hole into which the permanent magnet is inserted;
The magnet insertion hole is a square hole,
At least one convex portion protruding inward of the magnet insertion hole is formed in the width direction intermediate portion of each of the first and second side walls adjacent to each other among the side walls of the magnet insertion hole,
The third and fourth side walls that oppose the first and second side walls do not have a convex portion that protrudes inside the magnet insertion hole,
The permanent magnet is pressed against the third and fourth side walls by the convex portions formed on the first and second side walls, and is in surface contact with the third and fourth side walls,
Any one of the side walls is interposed between the magnetically sensitive element and the permanent magnet .
Another embodiment of the present invention is also a moving object detection device. This mobile object detection device
A magnetic sensitive element;
A permanent magnet for applying a magnetic field to the magnetically sensitive element;
A holding member for holding the magnetically sensitive element and the permanent magnet;
The holding member has a magnet insertion hole into which the permanent magnet is inserted;
The magnet insertion hole is a square hole,
At least the first side wall and the second side wall adjacent to each other among the side walls of the magnet insertion hole and the third side wall adjacent to the second side wall protrude at the inside of the magnet insertion hole at the middle in the width direction. One convex part is formed,
The fourth side wall facing the second side wall does not have a protrusion protruding inside the magnet insertion hole,
The permanent magnet is pressed between the convex portions formed on the first and third side walls and pressed against the fourth side wall by the convex portions formed on the second side wall. In surface contact with the fourth side wall,
Any one of the side walls is interposed between the magnetically sensitive element and the permanent magnet.
In the moving body detection apparatus according to another aspect, the magnetically sensitive element may be located behind the second side wall or the fourth side wall.

In the moving body detection device of each aspect, the convex portion may have a height at which a tip located on the opening side of the magnet insertion hole does not reach the opening end of the magnet insertion hole.

In the moving body detection device of each aspect, the surface of the convex portion may be a curved surface.

In the movable body detection device of each aspect, the convex portion approaches the opening end of the magnet insertion hole over a predetermined length in the depth direction of the magnet insertion hole from the tip located on the opening side of the magnet insertion hole. Accordingly, it is preferable that the protruding length from the side wall gradually decreases.

In the moving body detection device of each aspect, the convex portion may have an elongated shape extending over a predetermined length in the depth direction of the magnet insertion hole.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the present invention, the permanent magnet is sandwiched in contact with the convex portion formed on the side wall of the magnet insertion hole and the portion of the magnet insertion hole facing the convex portion. Even if it is not sealed, the displacement of the permanent magnet when vibration or impact is applied can be suppressed, and the reliability of the apparatus can be improved.

1 is a side sectional view showing a configuration of a moving object detection device according to a first embodiment of the present invention. It is explanatory drawing which shows the positional relationship of the moving body detection apparatus and a soft-magnetic-material gear, (A) is a top view, (B) is a left view, (C) is a front view. The front-end | tip part expanded sectional view of the holding member of the moving body detection apparatus. IV-IV 'arrow view of FIG. FIG. 5 is a schematic comparison diagram comparing the influence of impact when a convex portion is formed in a magnet insertion hole (embodiment) and when it is not formed. It is an enlarged view of the magnet insertion hole of the holding member of the moving body detection apparatus concerning the 2nd Embodiment of this invention, (A) is a sectional side view, (B) is the bottom view which looked at the opening side (same figure) (A) B-B 'arrow view). Explanatory drawing of a modification. Explanatory drawing of a modification.

  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 a side sectional view showing a configuration of a moving object detection apparatus 100 according to the first embodiment of the present invention. 2A and 2B are explanatory views showing the positional relationship between the moving body detection device 100 and the soft magnetic gear 1, wherein FIG. 2A is a plan view, FIG. 2B is a left side view, and FIG. 2C is a front view. .

  As shown in FIG. 1, the moving body detection device 100 includes a case 20 and a holding member 30. The case 20 and the holding member 30 are made of, for example, PBT (PolyButylene Terephthalate). The holding member 30 holds the magnetic sensitive element 10 such as a Hall IC, the permanent magnet 60, and the substrate 70. As shown in FIG. 2, the moving body detection device 100 is used in a state where the magnetic sensitive element 10 is supported so as to face the outer peripheral surface of the soft magnetic gear 1 that is an example of the moving body.

  The magnetic sensitive element 10 is positioned in a recessed portion 39 formed at the distal end portion of the support portion 31 of the holding member 30 and is fixedly held.

  The permanent magnet 60 is inserted and held in the magnet insertion hole 36 formed in the support portion 31 and is positioned in the vicinity of the magnetic sensitive element 10, and applies a magnetic field to the magnetic sensitive element 10. Although details will be described later with reference to FIGS. 3 and 4, the side wall of the magnet insertion hole 36 is formed with at least one convex portion 37 projecting inside the magnet insertion hole 36, and the permanent magnet 60 has a convex portion. By being pressed by 37, the position shift in the magnet insertion hole 36 is prevented. The opening of the magnet insertion hole 36 is closed by the case 20.

  The substrate 70 is supported and fixed to the upper side portion of the support portion 31 (in the vicinity of the magnetic sensitive element 10). The terminal 11 of the magnetic sensitive element 10 is connected to the substrate 70, and an electronic component 80 (IC or chip element) that protects (processes) the output signal of the magnetic sensitive element 10 is mounted (mounted) on the substrate 70 to protect the output signal. (Process) The circuit is assembled.

  The end portions of the plurality of conductors 50 that are bent and formed in an L shape (insert molding) through the cylindrical plug body portion 32 of the holding member 30 are connected to the substrate 70, respectively, and the tip ends of the conductors 50 are the connectors. The pin 51 protrudes into the inner housing of the connector portion 33 of the holding member 30. The conductor 50 is for leading out an output signal detected by the magnetic sensitive element 10 to the outside. The substrate 70 is fixedly supported on the upper side portion of the support portion 31 by passing through the conductor 50 (integrated with the holding member 30) and soldering. The magnetic sensitive element 10 is fixedly held in the concave portion 39 at the tip of the support portion 31 by the terminal 11 being soldered to the substrate 70.

  The case 20 has a bottomed cylindrical shape with one end serving as an opening, and is configured to be fitted to the holding member 30. A flange portion 21 is formed integrally with the case 20, and a collar 22 is fitted and fixed inside the flange portion 21. Further, an O-ring attachment groove 40 for attaching the moving body detection device 100 to the other side is formed on the outer peripheral portion of the case 20 (the front side of the flange portion 21). A constricted portion 34 is formed in the cylindrical plug body portion 32 of the holding member 30, and an O-ring 35 as an elastic body for watertight sealing such as rubber is attached to the constricted portion 34. In addition, regarding the fitting structure of the case 20 and the holding member 30, the technique of the said patent document 1 is applicable.

  Hereinafter, the holding structure of the permanent magnet 60 will be described in detail. FIG. 3 is an enlarged cross-sectional view of the distal end portion (near the magnet insertion hole 36) of the holding member 30 of the moving body detection device 100 of the present embodiment. 4 is a view taken in the direction of arrows IV-IV ′ in FIG.

  As shown in these drawings, among the side walls of the magnet insertion hole 36 which is a square hole (square hole), the first side wall 301 and the second side wall 302 adjacent to each other and the third side wall adjacent to the second side wall 302 are provided. For example, two convex portions 37 projecting inward of the magnet insertion hole 36 are formed at each intermediate portion in the width direction of the side wall 303 (that is, a portion that is not a corner), for example, two (total six). On the other hand, the fourth side wall 304 facing the second side wall 302 has a flat surface without a convex portion. Each convex portion 37 has an elongated shape (rib shape) extending from the bottom of the magnet insertion hole 36 over a predetermined length in the depth direction of the magnet insertion hole 36 (vertical direction in FIG. 3). The surface of each convex portion 37 is a curved surface (a curved surface that protrudes inside the magnet insertion hole 36, for example, an arc surface or an elliptical arc surface). The magnetic sensitive element 10 is located behind the fourth side wall 304 (a plane on which the convex portion 37 is not formed).

The rectangular parallelepiped permanent magnet 60 has a length in the vertical direction in FIG. 4 that is smaller than the distance L ₁₃ between the first and third side walls 301, 303 and is formed on the first and third side walls 301, 303. The distance L ₁₃ ′ between the vertices of the convex portions 37 (the distance before the permanent magnet 60 is inserted) is slightly larger. Further, the permanent magnet 60 has a length in the horizontal direction in the drawing that is smaller than the distance L ₂₄ between the second and fourth side walls 302 and 304, and the apex of the convex portion 37 formed on the second side wall 302. And slightly larger than the distance L ₂₄ ′ (distance before the permanent magnet 60 is inserted) between the flat side wall and the fourth side wall 304 which is a plane. Here, although the dimensional tolerance exists in the magnet insertion hole 36 and the permanent magnet 60, even when the permanent magnet 60 having the smallest dimension within the tolerance range and the magnet insertion hole 36 having the largest dimension within the tolerance range are combined. In addition, it is preferable to form the convex portion 37 having a size that does not allow the permanent magnet 60 to rattle from the magnet insertion hole 36. Although it is desirable that the depth of the magnet insertion hole 36 and the length of the permanent magnet 60 in the insertion direction match in terms of assembly and management, the permanent magnet 60 is slightly shorter than the depth of the magnet insertion hole 36. Or longer. The positional shift of the permanent magnet 60 with respect to the depth direction of the magnet insertion hole 36 has a relatively small influence on the output voltage of the magnetic sensitive element 10.

  With the above dimensional relationship, the permanent magnet 60 is sandwiched in contact with the convex portion 37 and the portion of the magnet insertion hole 36 that faces the convex portion 37 in the magnet insertion hole 36. That is, in the magnet insertion hole 36, the permanent magnet 60 is sandwiched between the convex portions 37 formed on the first and third side walls 301 and 303 in the longitudinal direction in FIG. The direction (the direction connecting the magnetic sensing element 10 and the permanent magnet 60) is sandwiched between the convex portion 37 formed on the second side wall 302 and the fourth side wall 304 which is a plane. In this state, the permanent magnet 60 is pressed in the vertical and horizontal directions in FIG. 4 by the six convex portions 37 and the fourth side wall 304, thereby preventing displacement due to vibration or impact in the same direction.

  As shown in FIG. 3, the tip 371 of each convex portion 37 (the tip located on the opening side of the magnet insertion hole 36) has a height that does not reach the opening end 361 of the magnet insertion hole 36. As a result, when the permanent magnet 60 is inserted into the magnet insertion hole 36, the permanent magnet 60 is first temporarily inserted to the depth of the tip 371 of each convex portion 37, and then the convex portion 37 is deformed (crushed) and deeper. It can be press-fitted (mainly inserted), and the permanent magnet 60 can be easily inserted as compared with the case where the tip 371 has a height reaching the opening end 361 of the magnet insertion hole 36. The height of the tip 371 is set such that the distance between the open end 361 and the tip 371 is preferably half the length of the permanent magnet 60 (the length in the vertical direction in FIG. 3). For example, when the length of the permanent magnet 60 and the depth of the magnet insertion hole 36 are 5 mm, each convex portion 37 is present within a range of 2.5 mm from the bottom of the magnet insertion hole 36 (of the tip 371). The height is 2.5mm). Considering the insertion workability of the permanent magnet 60, the distance between the open end 361 and the tip 371 is preferably one quarter or more of the length of the permanent magnet 60.

  Each convex portion 37 gradually protrudes from each side wall as it approaches the opening end 361 of the magnet insertion hole 36 over a predetermined length from the tip 371 in the depth direction of the magnet insertion hole 36 (vertical direction in FIG. 3). The inclined surface 372 becomes shorter. Thus, when the permanent magnet 60 is inserted into the magnet insertion hole 36, it is possible to prevent the permanent magnet 60 from being caught at the tip 371 of each convex portion 37, so that the tip surface of each convex portion 37 does not have the inclined surface 372. The permanent magnet 60 can be easily inserted as compared with the case of being perpendicular to each side wall. The inclination angle of the inclined surface 372 is preferably 45 ° with respect to the side wall surface. The angle of 45 ° or less is suitable from the viewpoint of ease of insertion.

  The assembly of the moving body detection apparatus 100 can be performed by the following procedure. First, the substrate 70 on which the electronic component 80 (IC or chip element) that protects (processes) the output signal is mounted is placed on and fixed to the upper side portion of the support portion 31 of the holding member 30, and the magnetic sensitive element 10 is supported by the support portion. The permanent magnet 60 is inserted and held in the magnet insertion hole 36 of the support portion 31. In addition, the output terminal 11 of the magnetic sensitive element 10 is connected to the substrate 70, and the end of the conductor 50 is connected to the substrate 70. Here, the tip of the conductor 50 is arranged as a connector pin 51 in a connector portion 33 for connection to an external circuit (not shown). Next, the holding member 30 with the O-ring 35 attached to the constricted portion 34 of the cylindrical plug body portion 32 is inserted into the opening of the bottomed cylindrical case 20, and the holding member 30 and the case 20 are fitted to each other. To fix and integrate. At this time, the O-ring 35 is interposed between the cylindrical plug body 32 and the inner periphery of the case 20 to seal water tightly between them.

  According to the present embodiment, the following effects can be achieved.

(1) Since the permanent magnet 60 is sandwiched between the convex portions 37 formed on the first to third side walls 301 to 303 and the fourth side wall 304, the permanent magnet 60 is sealed with a sealing body. Even if it does not stop, the displacement of the permanent magnet 60 when a vibration or impact is applied can be suppressed, and the reliability of the apparatus can be improved. FIG. 5 is a schematic comparison diagram comparing the influence of impact when the convex portion 37 is formed in the magnet insertion hole 36 (this embodiment) and when the convex portion 37 is not formed. In this figure, the horizontal axis represents time, and the vertical axis represents the output voltage of the magnetic sensitive element 10. It can be seen that when the convex portion 37 is formed in the magnet insertion hole 36 (the present embodiment), the positional displacement of the permanent magnet 60 is smaller, and the fluctuation of the output voltage when an impact is applied is smaller. Here, a structure in which the permanent magnet 60 is press-fitted into the magnet insertion hole 36 by constricting the opening size of the magnet insertion hole 36 to be smaller than the dimension of the permanent magnet 60 without providing a convex portion in the magnet insertion hole 36 can be considered. In view of the tolerance between the two, the structure is not preferable because the permanent magnet 60 may not enter the magnet insertion hole 36. Moreover, even if it enters, insertion workability | operativity is not good.

(2) Since the tip 371 of each convex portion 37 has a height that does not reach the opening end 361 of the magnet insertion hole 36, the workability of inserting the permanent magnet 60 into the magnet insertion hole 36 is good as described above.

(3) Since the inclined surface 372 is formed from the tip 371 of each convex portion 37 over a predetermined length, the workability of inserting the permanent magnet 60 into the magnet insertion hole 36 is good as described above.

(4) Since each convex portion 37 has a curved surface such as an arc surface, the dimensional accuracy is good. That is, if the surface is rounded, the corner is easy to be removed when it is removed from the mold after molding, and the dimensional accuracy is poor, but such a problem can be prevented by making the convex surface a curved surface.

(5) Since the permanent magnet 60 is sandwiched between the convex portions 37 formed on the first to third side walls 301 to 303 and the fourth side wall 304, temporary provisions required when the convex portions 37 are not provided. A fixing adhesive is unnecessary and preferable.

(6) The permanent magnet 60 is a fourth surface formed by the convex portion 37 formed on the second side wall 302 with respect to the direction connecting the magnetic sensing element 10 and the permanent magnet 60 (lateral direction in FIGS. 3 and 4). Since it is pressed against the side wall 304, the positional accuracy in the direction is higher than in the case of being sandwiched between the convex portions in the direction. On the other hand, since the permanent magnet 60 is sandwiched between the convex portions 37 in the direction perpendicular to the direction (vertical direction in FIG. 4), the ease of inserting the permanent magnet 60 is high.

(Second embodiment)
6A and 6B are enlarged views of the magnet insertion hole 36 of the holding member 30 of the moving body detection apparatus according to the second embodiment of the present invention, where FIG. 6A is a side sectional view and FIG. It is the bottom view (BB 'arrow view of the same figure (A)). The moving body detection device of the present embodiment is different from the first embodiment in that the convex portion 37 is not formed on the third side wall 303 of the magnet insertion hole 36, and in other points. Match. Hereinafter, the difference will be mainly described.

  As shown in FIG. 6B, a magnet insertion hole is formed in the width direction intermediate portion (that is, a non-corner portion) of each of the first and second side walls 301 and 302 adjacent to each other among the side walls of the magnet insertion hole 36. For example, two convex portions 37 projecting inside 36 are formed (four in total). On the other hand, the 3rd and 4th side walls 303 and 304 which oppose the 1st and 2nd side walls 301 and 302 are flat without a convex part. Therefore, in the magnet insertion hole 36, the permanent magnet 60 is sandwiched between the convex portion 37 formed on the first side wall 301 and the flat third side wall 303 in the longitudinal direction in FIG. With respect to the horizontal direction in the figure, it is sandwiched between the convex portion 37 formed on the second side wall 302 and the fourth side wall 304 which is a plane.

  According to the present embodiment, since the convex portion 37 is not formed on the third side wall 303 of the magnet insertion hole 36, the ease of insertion of the permanent magnet 60 into the magnet insertion hole 36 is the same as that of the first embodiment. The permanent magnet 60 is pressed against the third side wall 303, which is a plane, by the convex portion 37 formed on the first side wall 302 with respect to the longitudinal direction of FIG. The positional accuracy of the permanent magnet 60 is high.

  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 embodiment, the case where the inclined surface 372 is formed over the predetermined length from the tip 371 of each convex portion 37 has been described, but in the modified example, the inclined surface as illustrated in FIGS. 7A and 7B. It is good also as a structure where the front end surface of each convex part 37 is perpendicular | vertical to each side wall, without providing. This modification can also achieve the same effect as the embodiment from the viewpoint of preventing the displacement of the permanent magnet 60.

  Further, as illustrated in FIGS. 7C and 7D, the tip 371 may have a height that reaches the open end 361. This modification can also achieve the same effect as the embodiment from the viewpoint of preventing the displacement of the permanent magnet 60. In this modified example, by forming the inclined surface 372 similar to that of the embodiment from the tip 371 of each convex portion 37 over a predetermined length, the ease of inserting the permanent magnet 60 can be enhanced.

  Further, as illustrated in FIGS. 8A and 8B, each convex portion 37 may be a combination of a plane and a plane whose surfaces form a predetermined angle (for example, 90 ° to 120 °). In this case, the cross section of each convex portion 37 is a triangle. This modification can also achieve the same effect as the embodiment from the viewpoint of preventing the displacement of the permanent magnet 60.

  In each of the above-described modifications, whether or not the convex portion 37 is provided on the third side wall 303 of the magnet insertion hole 36 can be appropriately selected according to design convenience and performance requirements.

  In the embodiment, the case where the convex portion 37 is formed at the intermediate portion in the width direction of the side wall has been described. However, in the modification, the convex portion 37 is formed at the end in the width direction of the side wall as illustrated in FIGS. It may be formed on the part and straddle the side walls adjacent to each other. This modification is not accurate because the degree of insertion of the permanent magnet 60 into the magnet insertion hole 36 is different depending on the R (curvature radius) of the corner of the permanent magnet 60, but compared with the case where the convex portion 37 is not provided. There is an effect of suppressing the displacement of the permanent magnet 60.

  In the embodiment, the case where the magnet insertion hole 36 is bottomed (non-penetrating) has been described. However, in the modification, the magnet insertion hole 36 may be a through hole. Further, the convex portion 37 may not reach the bottom of the magnet insertion hole 36. Moreover, the convex part 37 may be a shape swelled in a dot shape instead of being an elongated shape (rib shape).

  Although the case where the magnet insertion hole 36 is a square hole has been described in the embodiment, the magnet insertion hole 36 is not limited to a square hole, and a part or all of the side wall may be a curved surface. Also in this modification, it is possible to prevent the displacement of the permanent magnet 60 by providing at least one convex portion 37 on the side wall.

  In the first embodiment, the convex portion 37 is not formed on the fourth side wall 304. However, in the modified example, the first side wall 301, the second side wall 302, or the second side wall 304 is replaced with the fourth side wall 304. It is good also as what does not form the convex part 37 in the side wall 303 of 3. In the second embodiment, the convex portions 37 are not formed on the third and fourth side walls 303 and 304. However, in the modified example, the first and second side walls 303 and 304 are replaced with the first and second side walls 303 and 304. The convex portions 37 may not be formed on the second side walls 301 and 302. Or it is good also as what does not form the convex part 37 in the 2nd and 3rd side walls 302,303 or the 1st and 4th side walls 301,304.

  The number of the convex parts 37 is not limited to two with respect to one side wall, and may be one or three or more.

DESCRIPTION OF SYMBOLS 10 Magnetic sensitive element 20 Case 30 Holding member 31 Support part 32 Columnar plug part 33 Connector part 36 Magnet insertion hole 37 Convex part 50 Conductor 51 Connector pin 60 Permanent magnet 70 Substrate 80 Electronic component 100 Moving body detection apparatus

Claims (7)

A magnetic sensitive element;
A permanent magnet for applying a magnetic field to the magnetically sensitive element;
A holding member for holding the magnetically sensitive element and the permanent magnet;
The holding member has a magnet insertion hole into which the permanent magnet is inserted;
The magnet insertion hole is a square hole,
At least one convex portion protruding inward of the magnet insertion hole is formed in the width direction intermediate portion of each of the first and second side walls adjacent to each other among the side walls of the magnet insertion hole,
The third and fourth side walls that oppose the first and second side walls do not have a convex portion that protrudes inside the magnet insertion hole,
The permanent magnet is pressed against the third and fourth side walls by the convex portions formed on the first and second side walls, and is in surface contact with the third and fourth side walls,
Any one of the said side walls is interposed between the said magnetic sensitive element and the said permanent magnet , The moving body detection apparatus. A magnetic sensitive element;
A permanent magnet for applying a magnetic field to the magnetically sensitive element;
A holding member for holding the magnetically sensitive element and the permanent magnet;
The holding member has a magnet insertion hole into which the permanent magnet is inserted;
The magnet insertion hole is a square hole,
At least the first side wall and the second side wall adjacent to each other among the side walls of the magnet insertion hole and the third side wall adjacent to the second side wall protrude at the inside of the magnet insertion hole at the middle in the width direction. One convex part is formed,
The fourth side wall facing the second side wall does not have a protrusion protruding inside the magnet insertion hole,
The permanent magnet is pressed between the convex portions formed on the first and third side walls and pressed against the fourth side wall by the convex portions formed on the second side wall. In surface contact with the fourth side wall,
Any one of the said side walls is interposed between the said magnetic sensitive element and the said permanent magnet, The moving body detection apparatus. The moving body detection apparatus according to claim 2 , wherein the magnetically sensitive element is located behind the second side wall or the fourth side wall. 4. The moving body detection device according to claim 1, wherein the protrusion has a height at which a tip located on an opening side of the magnet insertion hole does not reach an opening end of the magnet insertion hole. A moving body detection device. The moving body detection apparatus as described in any one of Claim 1 to 4 WHEREIN: The moving body detection apparatus whose surface of the said convex part is a curved surface. The moving body detection device according to any one of claims 1 to 5 , wherein the convex portion extends from the tip located on the opening side of the magnet insertion hole over a predetermined length in the depth direction of the magnet insertion hole. The moving body detection apparatus in which the protrusion length from the side wall is gradually shortened as approaching the opening end of the magnet insertion hole. In moving object detection apparatus according to any one of claims 1 to 6, wherein the protrusions are elongated shape extending over a predetermined length in the depth direction of the magnet insertion holes, moving object detection apparatus.

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