JP5324348B2 - Displacement detection member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To detect relative displacement of a magnetic sensor and to improve the mechanical strength. <P>SOLUTION: Grooves 11a are formed at fixed intervals in the surface of a magnetic metal member 11; a conductive mixture material 12 consisting of a mixture of copper or a conductive material having conductivity equal to or higher than the copper and a thermal spray material harder than copper is embedded in the grooves 11a by thermal spraying, and the entire surface is covered with a surface reinforcing material 13 by thermal spraying. By detecting the difference in the eddy current loss and magnetic resistance between a region of the groove 11a and an area outside the groove 11a by a magnetic sensor D, relative displacement for the magnetic sensor D can be detected. Since the groove 11a is filled with the conductive mixture material 12 which is harder than copper by thermal spraying, mechanical strength can be improved. Since the entire surface is covered with the surface-reinforcing material 13 which is harder than copper by thermal spraying, the mechanical strength is improved. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a displacement detection member, and more particularly to a displacement detection member having improved mechanical strength.

Conventionally, a displacement detecting member for detecting a relative displacement with respect to a magnetic sensor in combination with a magnetic sensor, wherein grooves are formed in a rod made of a ferromagnetic material at regular intervals, and a nonmagnetic material is embedded in the groove. A member for detecting displacement in which magnetic material portions and nonmagnetic material portions are alternately arranged is known (for example, see Patent Document 1).
On the other hand, there is known a magnetic material guide in which unevenness is provided on the surface of a magnetic material guide that supports a movable body and the surface is covered with ceramic by thermal spraying (see, for example, Patent Document 2).

JP-A-5-196478 ([0016], FIG. 4) JP 2009-117803 A ([0025], FIG. 6)

As a specific example of the conventional displacement detecting member, for example, a groove formed in an annular shape at a predetermined interval in a cylindrical rod made of carbon steel is filled with copper by plating, and a magnetic material portion and a conductive material portion are alternately arranged. There are things that are arranged in line. By detecting the difference in eddy current loss and magnetic resistance between the magnetic material portion and the conductive material portion with a magnetic sensor (for example, an excitation coil and an output coil or a magnetoresistive element), the relative displacement of the rod with respect to the magnetic sensor can be detected.
However, since copper is soft, there is a problem that the copper portion is worn.
On the other hand, a chromium layer is plated on the surface to improve mechanical strength.
However, when an external force is applied from packing or the like, there is a problem that the chromium layer is broken or peeled off due to deformation of the copper portion.
Accordingly, an object of the present invention is to provide a displacement detecting member having improved mechanical strength.

In a first aspect, the present invention is a displacement detection member for detecting relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, wherein grooves (11a) are formed on the surface of the magnetic metal member (11) at regular intervals. ), And the groove (11a) is filled with a conductive mixture (12) obtained by spraying copper or a conductive material having a conductivity equal to or higher than copper and a thermal spray material harder than copper by thermal spraying. A displacement detecting member (10) is provided.
In a second aspect, the present invention provides the displacement detection member (10) according to the first aspect, wherein the magnetic metal member (11) is carbon steel and has a conductivity equal to or higher than that of the copper or copper. The conductive material is any one of copper, aluminum, zinc, silver, and gold, and the thermal spray material harder than the copper is tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, A displacement detection member (10) is provided which is one of ceramics.
In the displacement detection member (10) according to the first and second aspects, the magnetic sensor detects the difference in eddy current loss and magnetic resistance between the groove (11a) and the non-groove (11a). The relative displacement with respect to the sensor can be detected. Moreover, since the groove | channel (11a) is filled with the mixed material (12) harder than copper by thermal spraying, mechanical strength can be improved.

In a third aspect, the present invention provides a displacement detection member for detecting relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, wherein the conductive metal member has a conductivity equal to or higher than that of copper or copper ( Grooves (21a) are formed at regular intervals on the surface of 21), a mixed material (22) of a magnetic material and a thermal spray material is embedded in the grooves (21a) by thermal spraying, and a surface reinforcing material (23 which is harder than copper by thermal spraying) ) To provide a displacement detecting member (20) characterized by covering the entire surface.
In a fourth aspect, the present invention provides the displacement detecting member (20) according to the third aspect, wherein the conductive metal member (21) having a conductivity equal to or higher than the copper or copper is copper, aluminum, zinc. Silver, gold, the magnetic material is ferrite or permalloy, and the thermal spray material is tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, or ceramic. A displacement detecting member (20) is provided, wherein the surface reinforcing material (23) is the same material as the mixed material (22).
In the displacement detection member (20) according to the third and fourth aspects, the magnetic sensor detects the difference in eddy current loss and magnetic resistance between the groove (21a) and the non-groove (21a), thereby providing a magnetic The relative displacement with respect to the sensor can be detected. Moreover, since the whole surface was covered with the surface reinforcing material (23) harder than copper by spraying, the mechanical strength can be improved.

In a fifth aspect, the present invention relates to a displacement detection member for detecting relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, wherein grooves (11a) are formed on the surface of the magnetic metal member (11) at regular intervals. And the groove (11a) is filled with a mixture (32) of a thermal spray material harder than copper and a magnetic material having a magnetic permeability different from that of the magnetic metal member (11). A detection member (30) is provided.
In a sixth aspect, the present invention provides the displacement detection member (30) according to the fifth aspect, wherein the magnetic metal member (11) is carbon steel, and the magnetic metal member (11) has a magnetic permeability. The different magnetic material is ferrite or permalloy, and the thermal spray material harder than the copper is any one of tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, and ceramic. A displacement detecting member (30) is provided.
In the displacement detection member (30) according to the fifth and sixth aspects, the magnetic sensor detects the difference in eddy current loss and magnetic resistance between the groove (11a) and the non-groove (11a). The relative displacement with respect to the sensor can be detected. Moreover, since the groove | channel (11a) is filled with the mixed material (12) harder than copper by thermal spraying, mechanical strength can be improved.

In a seventh aspect, the present invention provides a surface reinforcing material (13) by spraying the surface of the displacement detection member (10, 30) according to any one of the first, second, fifth, and sixth aspects. , 33), the displacement detection member (10, 30) is provided.
In an eighth aspect, the present invention provides the displacement detection member (10, 30) according to the seventh aspect, wherein the surface reinforcing material (13, 33) is the same material as the mixed material (12, 32). Displacement detecting members (10, 30) are provided.
In the displacement detection members (10, 30) according to the seventh and eighth aspects, since the entire surface is covered with the surface reinforcing material (13, 33) harder than copper by thermal spraying, the mechanical strength can be improved. .

In a ninth aspect, the present invention provides a displacement detection member for detecting a relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, and includes grooves (on the surface of the nonmagnetic metal member (41) at regular intervals). 41a) was formed, and the groove (41a) was filled with a magnetic mixture (42) in which a magnetic material and a thermal spray material were mixed, and the entire surface was covered with a surface reinforcing material (43) harder than copper by thermal spraying. A displacement detecting member (40) is provided.
In a tenth aspect, the present invention provides the displacement detecting member (40) according to the ninth aspect, wherein the nonmagnetic metal member (41) is any one of copper, aluminum, zinc, silver, gold, and SUS. The magnetic material is ferrite or permalloy, and the thermal spray material is any one of tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, ceramic, and the surface. A displacement detecting member (40) is provided, wherein the reinforcing material (43) is the same material as the mixed material (42).
In the displacement detection member (40) according to the ninth and tenth aspects, the magnetic sensor detects the difference in eddy current loss and magnetoresistance between the groove (41a) and the non-groove (41a), thereby providing a magnetic sensor. The relative displacement with respect to the sensor can be detected. Moreover, since the whole surface was covered with the surface reinforcing material (43) harder than copper by thermal spraying, mechanical strength can be improved.

In an eleventh aspect, the present invention relates to a displacement detecting member (10, 20, 30, 40) according to any one of the first to tenth aspects, wherein the groove (11a, 21a, 41a) is filled by thermal spraying. There are at least two mixing ratios of the materials (12, 22, 32, 42), and the mixing ratio of the portion near the bottom of the grooves (11a, 21a, 41a) places importance on adhesion to the grooves (11a, 21a, 41a). The displacement detection member is characterized in that the mixing ratio in the portion far from the bottom of the groove (11a, 21a, 41a) is a mixing ratio that places importance on the detection by the magnetic sensor (D). .
In the displacement detection member according to the eleventh aspect, the balance between the adhesion to the grooves (11a, 21a, 41a) and the detection by the magnetic sensor (D) can be optimized.

  According to the displacement detection member of the present invention, the relative displacement with respect to the magnetic sensor can be detected. Further, the mechanical strength can be improved.

1 is a perspective view showing a displacement detection member according to Embodiment 1. FIG. FIG. 3 is a schematic diagram illustrating a cross section of a surface portion of a displacement detection member according to Example 1 and a magnetic sensor. FIG. 5 is a flowchart illustrating a manufacturing procedure of the displacement detection member according to the first embodiment. 1 is a perspective view showing a magnetic metal member according to Example 1. FIG. It is a perspective view which shows the magnetic metal member which filled the groove | channel by thermal spraying. 6 is a perspective view showing a displacement detection member according to Embodiment 2. FIG. FIG. 6 is a schematic diagram illustrating a cross section of a surface portion of a displacement detection member according to a second embodiment and a magnetic sensor. FIG. 9 is a perspective view showing a displacement detection member according to Embodiment 3. FIG. 10 is a schematic diagram showing a cross section of a surface portion of a displacement detection member according to Example 3 and a magnetic sensor. FIG. 10 is a perspective view illustrating a displacement detection member according to a fourth embodiment. FIG. 10 is a schematic diagram illustrating a cross section of a surface portion of a displacement detection member according to a fourth embodiment and a magnetic sensor.

  Hereinafter, the present invention will be described in more detail with reference to embodiments shown in the drawings. Note that the present invention is not limited thereby.

Example 1
FIG. 1 is a front view illustrating a displacement detection member 10 according to the first embodiment. FIG. 2 is a schematic view showing a cross section of the surface portion of the displacement detection member 10 and a magnetic sensor.
This displacement detecting member 10 has grooves 11a formed on the surface of the magnetic metal member 11 at regular intervals P, and the conductive mixed material 12 is buried in the grooves 11a by thermal spraying, and the entire surface is covered with the surface reinforcing material 13 by thermal spraying. It is a configuration.

  The magnetic metal member 11 is a die casting rod, and the base material is a quenching material of carbon steel S45C. The diameter is 55 mm to 180 mm, and the total length is 700 mm to 2200 mm.

  The groove 11a is a ring surrounding the outer periphery of the magnetic metal member 11, and has a depth of 0.3 mm. In order to improve the adhesion of the conductive mixed material 12, the wall surface is not a vertical surface but an inclined surface. The constant interval P is 16 mm, and the opening width of the groove 11a is 8 mm.

The conductive mixed material 12 is a material obtained by mixing copper or a conductive material having conductivity equal to or higher than copper and a thermal spray material harder than copper.
The conductive material having a conductivity equal to or higher than that of copper or copper is any one of copper, aluminum, zinc, silver, and gold.
The thermal spray material harder than copper is any one of tungsten carbide / nickel chromium, tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, cermet, and ceramic.
Specific examples of the mixing ratio include Cu 10 to 30%, WC 73 to 20%, Ni 7 to 20%, Cr 5 to 20%, and C 5 to 10%.

  The surface reinforcing material 13 is the same material as the conductive mixed material 12 because the thermal spraying work is facilitated. However, only a thermal spray material harder than copper may be used.

  As shown in FIG. 2, the magnetic sensor D includes excitation coils S, −S, C, and −C and output coils 21, 22, 23, and 24, and is installed close to the surface of the displacement detection member 10. The

FIG. 3 is a flowchart showing the manufacturing procedure of the displacement detection member 10.
In step S1, as shown in FIG. 4, the magnetic metal member 11 having the annular grooves 11a formed on the surface at regular intervals P is manufactured.

In step S2, a portion other than the groove 11a is covered (masking process), a blast material is sprayed to roughen the groove 11a (blast process), and a soft metal (for example, Ni-P alloy) for improving adhesion Is sprayed thinly (for example, 100 μm) (undercoat treatment), the conductive mixed material 12 is sprayed (topcoat treatment), and the groove 11a is filled with the conductive mixed material 12 as shown in FIG.
As the thermal spraying method, HVOF (High Velocity Oxigen Fuel) method or HVAF (High Velocity Air Fuel) method is used for precise spraying. The spraying temperature of the HVOF method is 2500 ° C. to 3000 ° C., and the spraying temperature of the HVAF method is 1400 ° C. to 2000 ° C. The conductive mixed material 12 uses powder.

  In step S 3, the cover is removed to expose the entire surface, the conductive mixed material 12 is sprayed, and the entire surface is covered with the surface reinforcing layer 13.

In step S4, the entire surface is polished to adjust the external dimensions.
In step S5, the holes on the entire surface are filled with epoxy resin, phenol resin, silicon resin, or the like (sealing process).

According to the displacement detection member 10 according to the first embodiment, the following effects can be obtained.
(1) By detecting the difference in eddy current loss and magnetic resistance between the groove 11a and the non-groove 11a with the magnetic sensor D, the relative displacement with respect to the magnetic sensor D can be detected.
(2) Since the groove 11a is filled with the conductive mixed material 12 harder than copper by thermal spraying, the mechanical strength can be improved.
(3) Since the entire surface is covered with the surface reinforcing material 13 harder than copper by spraying, the mechanical strength can be improved.

-Example 2-
FIG. 6 is a front view illustrating the displacement detection member 20 according to the second embodiment. FIG. 7 is a schematic view showing a cross section of the surface portion of the displacement detection member 20 and a magnetic sensor.
This displacement detection member 20 has grooves 21a formed on the surface of the conductive metal member 21 at regular intervals P, the magnetic mixture 22 is embedded in the grooves 21a by thermal spraying, and the entire surface is hardened by copper to be harder than copper. The structure is covered with a material 23.

  The conductive metal member 21 is copper or a metal having a conductivity equal to or higher than that of copper.

The magnetic mixed material 22 is a material in which a magnetic material and a thermal spray material are mixed.
The magnetic material is ferrite or permalloy.
The thermal spray material is any of tungsten carbide / nickel chromium, tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, cermet, and ceramic.

  The surface reinforcing material 23 may be made of the same material as the magnetic mixing material 22 because the thermal spraying work is facilitated if the magnetic mixing material 22 is harder than copper. If the magnetic mixing material 22 is softer than copper, only the thermal spray material harder than copper is used.

  The manufacturing procedure of the displacement detection member 20 is in accordance with FIG.

According to the displacement detection member 20 according to the second embodiment, the following effects can be obtained.
(1) The relative displacement with respect to the magnetic sensor D can be detected by detecting the difference in eddy current loss and magnetic resistance between the groove 21a and the non-groove 21a with the magnetic sensor D.
(2) Since the entire surface is covered with the surface reinforcing material 13 harder than copper by spraying, the mechanical strength can be improved.

-Example 3-
FIG. 8 is a front view illustrating the displacement detection member 30 according to the third embodiment. FIG. 9 is a schematic diagram showing a cross section of the surface portion of the displacement detection member 30 and a magnetic sensor.
This displacement detecting member 30 has grooves 11a formed on the surface of the magnetic metal member 11 at regular intervals P, the magnetic mixture material 32 is buried in the grooves 11a by thermal spraying, and the entire surface is covered with a surface reinforcing material 33 by thermal spraying. It is a configuration.

  The magnetic metal member 11 is a die casting rod, and the base material is a quenching material of carbon steel S45C.

The magnetic mixed material 32 is a material in which a magnetic material having a magnetic permeability different from that of the magnetic metal member 11 and a thermal spray material harder than copper are mixed.
The magnetic material is ferrite or permalloy.
The thermal spray material is any of tungsten carbide / nickel chromium, tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, cermet, and ceramic.

  The surface reinforcing material 33 may be made of the same material as the magnetic mixed material 32 because the thermal spraying work is facilitated. However, only a thermal spray material harder than copper may be used.

  The manufacturing procedure of the displacement detection member 30 is in accordance with FIG.

According to the displacement detection member 30 according to the third embodiment, the following effects can be obtained.
(1) By detecting the difference in eddy current loss and magnetic resistance between the groove 11a and the non-groove 11a with the magnetic sensor D, the relative displacement with respect to the magnetic sensor D can be detected.
(2) Since the groove 11a is filled with the magnetic mixture material 32 harder than copper by spraying, the mechanical strength can be improved.
(3) Since the entire surface is covered with the surface reinforcing material 33 harder than copper by spraying, the mechanical strength can be improved.

Example 4
FIG. 10 is a front view illustrating the displacement detection member 40 according to the fourth embodiment. FIG. 11 is a schematic diagram showing a cross section of the surface portion of the displacement detection member 40 and a magnetic sensor.
This displacement detection member 40 has grooves 41a formed on the surface of the nonmagnetic metal member 41 at regular intervals P, and a magnetic mixture 42 is buried in the grooves 41a by thermal spraying, and the entire surface is hardened by copper to be harder than copper. The structure is covered with a material 43.

  The nonmagnetic metal member 41 is any one of copper, aluminum, zinc, silver, gold, and SUS.

The magnetic mixed material 42 is a material in which a magnetic material and a thermal spray material are mixed.
The magnetic material is ferrite or permalloy.
The thermal spray material is any of tungsten carbide / nickel chromium, tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, cermet, and ceramic.

  The surface reinforcing material 43 may be made of the same material as the magnetic mixed material 42 because the thermal spraying work is facilitated if the magnetic mixed material 42 is harder than copper. If the magnetic mixing material 42 is softer than copper, only the thermal spray material harder than copper is used.

  The manufacturing procedure of the displacement detection member 40 is in accordance with FIG.

According to the displacement detection member 40 according to the fourth embodiment, the following effects can be obtained.
(1) The relative displacement with respect to the magnetic sensor D can be detected by detecting the difference in the eddy current loss and the magnetic resistance in the portion of the groove 41a and the portion that is not the groove 41a with the magnetic sensor D.
(2) Since the entire surface is covered with the surface reinforcing material 43 harder than copper by spraying, the mechanical strength can be improved.

-Example 5
When the grooves 11a, 21a, 41a are filled with the mixed materials 12, 22, 32, 42 by spraying, the spraying is divided into several stages, and the mixing ratio is focused on the adhesion to the grooves 11a, 21a, 41a at the stage near the beginning. (Increase the mixing ratio of the sprayed material), and near the end, the mixing ratio may be set to emphasize the detectability by the magnetic sensor D (increasing the mixing ratio of the conductive material or the magnetic material).

  The displacement detection member of the present invention can be used for a position detection device such as a pneumatic cylinder or a hydraulic cylinder.

DESCRIPTION OF SYMBOLS 10 Displacement detection member 11 Magnetic metal member 11a Groove 12 Conductive mixed material 13 Surface reinforcement material 20 Displacement detection member 21 Conductive metal member 21a Groove 22 Magnetic mixture material 23 Surface reinforcement material 30 Displacement detection member 32 Magnetic mixture material 33 Surface reinforcing material 40 Displacement detecting member 41 Non-magnetic metal member 41a Groove 42 Magnetic mixed material 43 Surface reinforcing material

Claims (11)

A displacement detection member for detecting relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, wherein grooves (11a) are formed on the surface of the magnetic metal member (11) at regular intervals, and the grooves (11a) Displacement detecting member (10), characterized in that copper or a conductive mixed material (12) obtained by mixing a conductive material having conductivity equal to or higher than copper and a thermal spray material harder than copper is embedded by thermal spraying. The displacement detection member (10) according to claim 1, wherein the magnetic metal member (11) is carbon steel, and the conductive material having a conductivity equal to or higher than the copper or copper is copper, aluminum, zinc, silver. The thermal spray material harder than copper is any one of tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, and ceramic. Displacement detecting member (10) characterized. A displacement detecting member for detecting a relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, wherein grooves are formed on the surface of copper or a conductive metal member (21) having a conductivity equal to or higher than copper at regular intervals. (21a) was formed, and the groove (21a) was filled with a magnetic mixture (22) in which a magnetic material and a thermal spray material were mixed, and the entire surface was covered with a surface reinforcing material (23) harder than copper by thermal spraying. A displacement detection member (20) characterized by the above. The displacement detection member (20) according to claim 3, wherein the copper or the conductive metal member (21) having a conductivity equal to or higher than copper is any one of copper, aluminum, zinc, silver, and gold, The magnetic material is ferrite or permalloy, and the thermal spray material is any one of tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, and ceramic, and the surface enhancement The displacement detection member (20), wherein the material (23) is the same material as the magnetic mixed material (22). A displacement detection member for detecting relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, wherein grooves (11a) are formed on the surface of the magnetic metal member (11) at regular intervals, and the grooves (11a) A displacement detecting member (30), wherein a magnetic mixed material (32) obtained by mixing a magnetic material having a magnetic permeability different from that of the magnetic metal member (11) and a thermal spray material harder than copper is embedded by thermal spraying. The displacement detection member (30) according to claim 5, wherein the magnetic metal member (11) is carbon steel, and a magnetic material having a magnetic permeability different from that of the magnetic metal member (11) is ferrite or permalloy, The thermal spray material harder than copper is any one of tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, and ceramic. 30). The surface of the displacement detecting member (10, 30) according to any one of claims 1, 2, 5, and 6 is covered with a surface reinforcing material (13, 33) by thermal spraying. Displacement detecting members (10, 30). The displacement detection member (10, 30) according to claim 7, wherein the surface reinforcing material (13, 33) is the same material as the mixed material (12, 32). 10, 30). A displacement detection member for detecting a relative displacement with respect to the magnetic sensor in combination with a magnetic sensor, wherein grooves (41a) are formed on the surface of the nonmagnetic metal member (41) at regular intervals, and the grooves (41a A displacement detecting member (40) characterized in that a magnetic mixed material (42) in which a magnetic material and a thermal spray material are mixed with each other is embedded by thermal spraying and the entire surface is covered with a surface reinforcing material (43) harder than copper by thermal spraying. ). The displacement detection member (40) according to claim 9, wherein the nonmagnetic metal member (41) is any one of copper, aluminum, zinc, silver, gold, and SUS, and the magnetic material is ferrite or permalloy. The sprayed material is any one of tungsten carbide / cobalt, tungsten carbide / nickel, tungsten carbide / cobalt chromium, tungsten carbide / nickel chromium, cermet, and ceramic, and the surface reinforcing material (43) is the magnetic mixed material. The displacement detection member (40), which is made of the same material as (42). The displacement detection member (10, 20, 30, 40) according to any one of claims 1 to 10, wherein the mixture (12, 22, 32, 42) fills the groove (11a, 21a, 41a) by thermal spraying. ) At least in two stages, and the mixing ratio of the portion close to the bottom of the groove (11a, 21a, 41a) is a mixture ratio that places importance on adhesion to the groove (11a, 21a, 41a), and the groove (11a 21a, 41a) is a displacement detection member characterized in that the mixing ratio in the portion far from the bottom is a mixing ratio that places importance on the detection by the magnetic sensor (D).

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