JPH11295331A - Rotation speed sensor or rotation angle sensor - Google Patents

Abstract

(57) [Summary] [Problem] To prevent output of an output signal indicating that a counterpart gear is rotating even though it is not rotating, a rotation speed at which output can be stabilized. It is an object to provide a sensor or a rotation angle sensor. SOLUTION: A magnet 27, a pair of magnetoresistive elements 29 provided in the vicinity of the magnet 27, and a base 24 for providing a base terminal electrically connected to the magnetoresistive element 29 and holding the magnet 27 are provided. A space 26 having an opening on one side for holding the magnet 27 is provided in the base 24, the magnet 27 is inserted into the space 26 through an opening on one side, and the magnet 27 is inserted into the space 26. A rattling correcting means 25 for correcting rattling of the magnet in a state where the magnet 27 is inserted into the space 26 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation speed sensor for detecting a rotation speed or a rotation angle sensor for detecting a rotation angle.

[0002]

2. Description of the Related Art A conventional rotation speed sensor of this type includes:
One disclosed in Japanese Patent Application Laid-Open No. Hei 8-201016 is known.

Hereinafter, a conventional rotation speed sensor will be described with reference to the drawings. FIG. 7 is a side sectional view of a conventional rotation speed sensor, and FIG. 8 is a side view showing a state where a magnet is mounted in a space in a base of the sensor.

7 and 8, reference numeral 1 denotes a bottomed cylindrical resin case, which is provided with a connector portion 2 protruding outward from an upper outer surface. A connector terminal 3 is provided inside the section 2. 4
Is a resin base housed in the case 1. The base 4 is provided with a space portion 11 having an open bottom surface at a lower portion.
The magnet 5 is mounted inside the space 11, and a pair of magnetoresistive elements 6 are provided on the lower surface of the magnet 5.
The space 11 is larger than the magnet 5 so that the magnet 5 can be easily mounted. Also,
A circuit board 7 made of a flexible wiring board is provided on a side surface of the base 4, and a circuit component 8 is mounted on the circuit board 7, and the circuit component 8 converts an output signal of the magnetoresistive element 6 into a rectangular wave. Converting. Further, a lead wire 9 is provided on the upper part of the circuit board 7, and one end of the lead wire 9 is electrically connected to the circuit component 8 of the circuit board 7, and the other end is connected to the connector of the case 1. It is electrically connected to the terminal 3. Reference numeral 10 denotes a lid made of resin. The lid 10 closes an upper opening of the case 1.

[0005] Next, a method of assembling the conventional rotational speed sensor having the above-described structure will be described.

[0006] First, a pair of magnetoresistive elements 6 are bonded to the lower surface of the magnet 5. Next, the magnet 5 to which the magnetoresistive element 6 is adhered is mounted through a one-sided opening in a space 11 provided below the base 4 made of a preformed resin.

Next, a circuit board 7 made of a flexible wiring board having a circuit component 8 provided on a surface thereof is connected to a pair of magnetoresistive elements 6 having one end bonded to the lower surface of the magnet 5 and the other end being connected to the above-mentioned circuit board. It is formed on the side surface of the base 4 so as to be located above the base 4.

Next, the base 4 provided with the magnet 5, the pair of magnetoresistive elements 6, and the circuit board 7 is housed in the case 1 from above.

Next, the connector terminals 3 of the case 1 and the circuit board 7 of the base 4 are electrically connected by lead wires 9.

Finally, the top opening of the case 1 is
Closed by 0. Next, the operation of the conventional rotation speed sensor or rotation angle sensor configured as described above will be described. On the side facing the lower part of the case 1,
A counterpart gear (not shown) is provided, and the rotation of the unevenness of the gear changes the magnetic flux density applied to the pair of magnetoresistive elements 6 adhered to the lower part of the magnet 5. The change is output by the magnetoresistive element 6 as an output voltage having a sine waveform. Then, the output voltage having the sine waveform is converted into an output voltage of a rectangular wave by the circuit component 8 provided on the circuit board 7, and the output voltage of the rectangular wave is converted by the connector terminal 3 of the case 1 into a mating computer (FIG. Not shown)
To detect the rotation speed.

[0011]

However, in the above-described conventional configuration, the space 11 is configured to have a size larger than the magnet 5 so that the magnet 5 can be easily mounted. When the magnet 5 is tilted in the space 11, even if the gear (not shown) on the other side is not rotating, the distance to the gear on the other side of the pair of magnetoresistive elements 6 is increased. In the magnetoresistive element 6 on the side away from
This is equivalent to the case where the concave portion of the counterpart gear is approaching, and in the magnetoresistive element 6 on the side closer to the other counterpart gear, it is as if the convex portion of the counterpart gear is approaching. As a result, an output signal indicating that the other gear is rotating when it is not rotating is output, and as a result, the output of the rotation speed sensor or the rotation angle sensor is output. There was a problem that it became unstable.

The present invention solves the above-mentioned conventional problems, and does not output an output signal indicating that the other gear is rotating when the other gear is not rotating. It is an object of the present invention to provide a rotation speed sensor or a rotation angle sensor that can be made into a single unit.

[0013]

In order to achieve the above object, a rotation speed sensor or rotation angle sensor according to the present invention comprises: a magnet; a pair of magnetoresistive elements provided near the magnet;
A base terminal electrically connected to the magnetoresistive element; and a base for holding the magnet. The base is provided with a space having an open surface for holding the magnet. The magnet is inserted from the opening, and the space portion is provided with a rattling correcting means for correcting rattling of the magnet in a state where the magnet is inserted into the space portion. It is possible to stabilize the output without outputting an output signal indicating that the side gear is rotating when it is not rotating.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a magnet, a pair of magnetoresistive elements provided near the magnet, and a base terminal electrically connected to the magnetoresistive element are provided. And a base for holding the magnet, provided in the base, a space having an open surface for holding the magnet is provided in the base, the magnet is inserted into the space from one surface opening, and in the space, A rattling correcting means for correcting rattling of the magnet when the magnet is inserted into the space is provided. According to this configuration, the magnet is inserted into the space in the space of the base. Since the rattling correcting means for correcting the rattling of the magnet in the above is provided, even if the space is configured to be larger in size than the magnet so that the magnet can be easily mounted, the rattling correcting means can be used to reduce the magnet in the space. Can't lean Therefore, since the distance between both the pair of magnetoresistive elements and the gear on the other side does not fluctuate, an output signal indicating that the gear on the other side is rotating when it is not rotating is output. As a result, the output of the rotation speed sensor or the rotation angle sensor can be stabilized.

According to a second aspect of the present invention, there is provided a bottomed cylindrical case provided with a connector portion having a connector terminal so as to protrude outward from an outer surface, a magnet housed in the case, and a lower portion provided with a magnet. A pair of magneto-resistive elements are provided on the lower surface of the magnet, and a circuit component for processing the output signal of the magneto-resistive element is provided on the side surface. A base having a base terminal electrically connected to the connector terminal of the case, a lid closing the opening of the case, and a space having an open surface on one side for holding the magnet is provided in the base,
The magnet is inserted into the space through a one-sided opening, and the space is provided with rattling correcting means for correcting rattling of the magnet in a state where the magnet is inserted into the space. According to the present invention, in the space of the base, the rattling correcting means for correcting the rattling of the magnet in a state where the magnet is inserted into the space is provided, so that the magnet can be easily mounted on the space. Even in the case of a larger size, the backlash correcting means does not cause the magnet to tilt in the space, so that the distance between both the pair of magnetoresistive elements and the gear on the other side does not fluctuate. However, there is no possibility that an output signal indicating that the other gear is rotating when it is not rotating is not output, and as a result, the output of the rotation speed sensor or the rotation angle sensor can be stabilized. Those having an effect of that.

According to a third aspect of the present invention, the rattling correcting means according to the first or second aspect is constituted by an elastic body. According to this configuration, the rattling correcting means is constituted by an elastic body. Therefore, the pair of magneto-resistive elements can be urged toward the gear of the other party by the correcting means made of the elastic body, whereby the distance between the pair of magneto-resistive elements and the gear of the other party can be reduced. Since it is small, the change in the output signal of the pair of magnetoresistive elements is large, and as a result, the sensitivity of the output of the rotation speed sensor or the rotation angle sensor is improved.

According to a fourth aspect of the present invention, the substrate according to the first or second aspect is formed of a resin, and the rattling correcting means is formed of a rib provided on an inner wall of the space.
According to this configuration, since the rattling correcting means is constituted by the rib provided on the inner wall of the space, the rib can be formed at the same time when the resin base is formed. This has the function of easily forming the correction means.

According to a fifth aspect of the present invention, the base is made of a resin, and a hole is formed on a surface of the base opposite to the opening on one surface of the space portion to allow a deformed portion of the rib when the magnet is inserted to escape. According to the configuration, since a hole is provided on a surface of the base opposite to the one surface opening of the space portion to allow a deformed portion of the rib when the magnet is inserted, the deformed portion when the rib is inserted enters this hole. This has the effect that the magnet can be securely mounted to the bottom of the space facing the one surface opening of the space of the base.

According to a sixth aspect of the present invention, the base is made of a resin, and a concave portion is provided on a surface of the base opposite to the opening on one surface of the space to allow a deformed portion of the rib when the magnet is inserted to escape. According to the configuration, since the concave portion for allowing the deformed portion of the rib at the time of inserting the magnet is provided on the surface of the base opposite to the one surface opening of the space portion, the deformed portion at the time of inserting the rib enters the concave portion, This has the effect that the magnet can be securely mounted to the bottom of the space facing the one surface opening of the space of the base.

Hereinafter, a rotation speed sensor or a rotation angle sensor according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of a rotation speed sensor or a rotation angle sensor according to an embodiment of the present invention, FIG. 2 is a side sectional view of the rotation speed sensor or the rotation angle sensor, and FIG. FIG. 4 is a side sectional view showing a state in which a magnet is mounted in a space of the base in the rotation angle sensor, and FIG. 4 is a side sectional view showing a state in which a magnet is mounted in a space of the base in the rotation speed sensor or the rotation angle sensor.

In FIG. 1 to FIG. 4, reference numeral 21 denotes a cylindrical resin case having a bottom, and a connector portion 22 is provided at an upper portion of an outer surface of the case 21 so as to protrude outward. A connector terminal 23 is provided inside the portion 22. Reference numeral 24 denotes a resin-made base housed in the bottomed cylindrical case 21. A space 26 having a rattling correcting means 25 made of an elastic rib is provided below the base 24. The magnet 27 is provided in the space 26 so as to urge the magnet 27 downward by the rattling correcting means 25. Further, a hole 28 is provided on a surface of the base 24 facing the one surface opening of the space 26, and the backlash correcting means 25 made of a rib generated when the magnet 27 is inserted into the space 26 is formed in the hole 28. Is made to escape the deformed portion 25a. Further, a pair of magnetoresistive elements 29 are provided on the lower surface of the magnet 27. Further, a circuit board 30 made of a flexible wiring board is provided on a side surface of the base 24, and a circuit component 31 is provided on an upper surface of the circuit board 30, and the magneto-resistive element 29 is provided by the circuit component 31. Is converted to a rectangular wave output voltage. Furthermore, a base terminal 32 is integrally provided on the base 24, and one end of the base terminal 32 is electrically connected to the circuit component 31 of the circuit board 30, and the other end is electrically connected to the connector terminal 23. Connected. A lid 33 is made of resin. The lid 33 is provided so as to close an opening on the upper surface of the case 21.

Next, a method of assembling the rotational speed sensor or the rotational angle sensor according to one embodiment of the present invention will be described.

First, a pair of magnetoresistive elements 29 are bonded to the lower surface of the magnet 27. Next, the magnet 27 to which the magnetoresistive element 29 is bonded is attached to the base 2 made of a pre-formed resin.
4 is mounted through a one-sided opening in a space 26 having a rattling correcting means 25 provided at a lower portion of the lower part 4.

In this case, the base 24 is made of resin, and the rattling correcting means 25 is made of ribs provided on the inner wall of the space 26. Can be formed at the same time, and as a result, it is possible to easily form the rattling correcting means 25.

Further, the base 24 is made of resin, and the deformed portion 25a of the rattling correcting means 25, which is made of a rib when the magnet 27 is inserted into the surface of the base 24 facing the one surface opening of the space portion 26, is formed. Since the escape hole 28 is provided, the rattling correcting means 2 made of a rib is formed in the hole 28.
The deformed portion 25a at the time of the insertion of the 5 enters, and thereby has an effect that the magnet 27 can be securely mounted to the bottom of the space 26 facing the one surface opening of the space 26 of the base 24.

Next, the circuit components 31 are placed on the upper surface of the circuit board 30.
After mounting, the circuit board 30 is mounted on the side surface of the base 24. In this case, the circuit board 30 has one end electrically connected to the magnetoresistive element 29 and the other end connected to the base 2.
4 is mounted on the side surface of the base 24 so as to be electrically connected to the base terminal 32 provided integrally with the upper part of the base 4.

Next, the base 24 provided with the magnetoresistive element 29, the magnet 27 and the circuit board 30 is housed inside the case 21 from the upper opening of the case 21.

Next, the base terminal 32 of the base 24 housed in the case 21 and the connector terminal 2 of the case 21
3 is electrically connected by soldering.

Finally, the upper opening of the case 21 is closed with a lid 33. Next, the operation of the rotation speed sensor or the rotation angle sensor according to the embodiment of the present invention configured as described above will be described.

On the side facing the lower part of the case 21,
A gear (not shown) of the other vehicle is provided, and the rotation of the unevenness of the gear changes the magnetic flux density applied to the magneto-resistive element 29. Output as waveform output voltage. And
The output voltage of the sine waveform is converted into an output voltage of a rectangular wave by a circuit component 31 provided on the circuit board 30, and the output voltage of the rectangular wave is converted to the connector terminal 2 of the case 21.
The signal is output to the other computer (not shown) by 3 and the number of rotations or the angle of rotation is detected.

In the rotation speed sensor or rotation angle sensor according to the embodiment of the present invention, the base 2
In the space 26 of FIG. 4, the rattle correcting means 25 composed of a rib for correcting the rattling of the magnet 27 in a state where the magnet 27 is inserted into the space 26 is provided.
Is larger than the magnet 27 so that the magnet 27 can be easily mounted, the backlash correcting means 25 does not cause the magnet 27 to tilt in the space 26. Since the distance between the two gears and the other gear (not shown) does not fluctuate, an output signal indicating that the other gear is rotating when it is not rotating is output. As a result, the output of the rotation speed sensor or the rotation angle sensor can be stabilized.

Since the rattling correcting means 25 is made of an elastic body, the rattling correcting means 2 made of this elastic body is used.
5, the pair of magneto-resistive elements 29 can be urged toward the gear (not shown) on the other side, thereby reducing the distance between the pair of magneto-resistive elements 29 and the gear on the other side. The change in the output signal of the pair of magnetoresistive elements 29 is large, and as a result, the sensitivity of the output of the rotation speed sensor or the rotation angle sensor is improved.

In the rotation speed sensor or the rotation angle sensor according to the embodiment of the present invention, the base 24 is made of resin, and the magnet 27 is provided on the surface of the base 24 facing the one surface opening of the space 26. Deformation portion 25a of rattling correcting means 25 comprising a rib when inserted
Although the configuration in which the hole 28 for allowing the air to escape is provided has been described, FIG.
As shown in FIG. 7, even when the concave portion 34 is provided instead of the hole 28, the same operation and effect as those of the above-described embodiment of the present invention can be obtained.

Further, in the rotation speed sensor or the rotation angle sensor according to the embodiment of the present invention, the rattling correcting means 25 is constituted by an elastic rib, but as shown in FIG. The rattling correcting means 35 may be provided as a separate member made of an elastic body such as a metal spring or rubber.

[0036]

As described above, the rotation speed sensor or the rotation angle sensor of the present invention comprises a magnet, a pair of magnetoresistive elements provided near the magnet, and a base electrically connected to the magnetoresistive element. A base provided with terminals and holding the magnet, a space having an open surface for holding the magnet is provided in the base, the magnet is inserted into the space through a one-sided opening, and the space is provided. And a rattling correcting means for correcting rattling of the magnet in a state where the magnet is inserted into the space, and according to this configuration, the magnet is inserted into the space in the space of the base. The rattling correcting means is provided to correct the rattling of the magnets in the state where the magnets are set. Therefore, even when the space is configured to have a size larger than the magnet so that the magnet can be easily mounted, the rattling correcting means can be used. The magnet does not tilt at this time, so that the distance between both of the pair of magnetoresistive elements and the counterpart gear does not fluctuate, so that the counterpart gear is rotating even though it is not rotating. Thus, the output signal is not output, and as a result, the output of the rotation speed sensor or the rotation angle sensor can be stabilized.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotation speed sensor or a rotation angle sensor according to an embodiment of the present invention.

FIG. 2 is a side sectional view of the rotation speed sensor or the rotation angle sensor.

FIG. 3 is a side view showing a state where a magnet is mounted in a space of a base body in the rotation speed sensor or the rotation angle sensor.

FIG. 4 is a side cross-sectional view showing a state where a magnet is mounted in a space of a base in the rotation speed sensor or the rotation angle sensor;

FIG. 5 is a side sectional view showing a state in which a magnet is mounted in a space of a base in a rotation speed sensor or a rotation angle sensor according to another embodiment of the present invention.

FIG. 6 is a side view showing a state in which a magnet is mounted in a space of a base in a rotation speed sensor or a rotation angle sensor according to still another embodiment of the present invention.

FIG. 7 is a side sectional view of a conventional rotation speed sensor.

FIG. 8 is a side view showing a state where a magnet is mounted in a space in a base body of the rotation speed sensor.

FIG. 9 is a side view showing a state in which a magnet is tilted and attached to a space in the base body of the rotation speed sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Case 22 Connector part 23 Connector terminal 24 Substrate 25, 35 Jiggle correction means 25a Deformation part 26 Space part 27 Magnet 28 Hole 29 A pair of magnetoresistive elements 31 Circuit component 33 Cover 34 Recess

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koji Nabetani 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 72) Inventor Yasuo Katsuki, 1006 Kadoma, Kadoma, Osaka Prefecture, Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A base, comprising: a magnet; a pair of magnetoresistive elements provided in the vicinity of the magnet; and a base for providing a base terminal electrically connected to the magnetoresistive element and holding the magnet. A space is provided on one side for holding the magnet, and the magnet is inserted into the space from the one side opening, and the magnet is inserted into the space and the magnet is inserted into the space. A rotational speed sensor or a rotational angle sensor provided with a rattling correcting means for correcting rattling. 2. A bottomed cylindrical case provided with a connector portion having a connector terminal so as to protrude outward from an outer surface, a magnet housed in the case, and a magnet fixed to a lower portion of the case. A pair of magnetoresistive elements are provided on the lower surface, and a circuit component for processing the output signal of the magnetoresistive element is provided on the side surface. One end is electrically connected to the circuit component and the other end is electrically connected to the connector terminal of the case. A base having a base terminal connected to the base, and a lid for closing an opening of the case, a space having an open surface for holding the magnet is provided on the base, and a space is formed in the space from the one surface opening. A rotation number sensor or a rotation angle sensor provided with rattling correcting means for correcting the rattling of the magnet in a state where the magnet is inserted and the magnet is inserted into the space, in the space. 3. The rotation number sensor or rotation angle sensor according to claim 1, wherein the rattling correcting means is formed of an elastic body. 4. The rotation speed sensor or rotation angle sensor according to claim 1, wherein the base is made of a resin, and the rattling correcting means is made of a rib provided on an inner wall of the space. 5. The rotation speed sensor or rotation angle according to claim 4, wherein the base is made of resin, and a hole is formed on a surface of the base opposed to the opening on one surface of the space portion to allow a deformed portion of a rib to escape when a magnet is inserted. Sensor. 6. A rotation speed sensor or a rotation angle according to claim 4, wherein the base is made of resin, and a concave portion is provided on a surface of the base opposed to the opening on one surface of the space portion to allow a deformed portion of the rib to escape when the magnet is inserted. Sensor.