JP2002116055A - Rotational angle detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotational angle detection device enabling adjustment in an assembled state even on sufficiently simple constituent parts, simple in handling and enabling constitution highly precisely. SOLUTION: A sensing unit 23 for detecting the rotational angle of a rotating body to be measured is provided on a housing 21, and incorporates EPROM and a register. The regulation of the output characteristic of the sensing unit 23 is performed by regulating EPROM and the register through a regulation terminal 252 from the outside of a sensor body 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic field rotation type rotation angle used as, for example, a sensor mechanism for detecting a throttle opening of an engine used for an automobile, a steering sensor for detecting a rotation angle of a steering, and the like. It relates to a detection device.

[0002]

2. Description of the Related Art Various rotation angle sensors constituting a rotation angle detecting mechanism using a magnetic field have been proposed. FIG. 7 shows a basic configuration of a rotation angle sensor using such a magnetic field. In the example shown in FIG. 7A, a magnetoresistive element 51 is formed in a ring shape on a fixed substrate surface. At the same time, a permanent magnet 52 which is rotated together with the measured object (not shown) is set with the central axis of the ring-shaped magnetoresistive element 51 as a rotation axis. The magnetic field generated by the permanent magnet 52 acts on the ring-shaped magneto-resistive element 51 to change its resistance, and the change in resistance between both ends of the magneto-resistive element 51 corresponds to the measured rotation angle. As a result, a rotation angle sensor of a magnet facing surface moving type is configured.

Further, as the rotation angle sensor, a magnetic field intensity change type is conceivable, and as the magnetic field intensity change type, there is a configuration as shown in FIG. That is, the magneto-sensitive element 54 composed of the pattern of the magneto-resistive elements is fixedly set on the substrate 53, and is opposed to the surface of the substrate 53.
A yoke 55 to be rotated together with the measured object is set, and a permanent magnet 56 is set to the yoke 55.
In this case, the surface of the yoke 55 facing the substrate 53 is formed to be inclined, and the distance between the yoke 55 and the magneto-sensitive element 54 is changed in accordance with the amount of the rotation angle. The rotation angle amount is detected according to the strength.

However, in such a rotation angle sensor of the magnet facing surface moving type and the magnetic field strength changing type, the relative position error between the magneto-sensitive element and the magnet set opposite thereto has an influence on the detection characteristics. It has a large direct effect.

To cope with such a problem, (C)
A rotation angle sensor of a parallel magnetic field rotation type as shown in the figure has been considered. That is, this rotation angle sensor is provided with a yoke 58 having a pair of leg pieces 581 and 582 extending parallel to the axial direction so as to rotate integrally with a shaft 57 that rotates together with the measured object. , Permanent magnets 591 and 592 are respectively set on the facing surfaces. And
The magnetic sensing element 54 is fixedly set so as to cross the magnetic flux formed between the permanent magnets 591 and 592.

That is, in this rotation angle sensor,
A parallel equal magnetic field is set between the pair of permanent magnets 591 and 592, and the sensitivity element 5 is set in the parallel equal magnetic field.
4 is set, so that the magnet 59
The influence of the relative position error between the magnetic sensing element 54 and the magnetic sensing element 54 is reduced, and the sensor is effectively adopted as a rotation angle sensor requiring detection accuracy and durability.

FIG. 8 shows a conventional example of a rotation angle detecting device using such a magnetic field rotation type rotation angle sensor.
The input shaft 61 is made of a magnetic material, and one end of the input shaft 61 is connected to the rotation of the object to be measured (not shown). An opening is formed on the other end surface along the axis, and the axis is sandwiched on the inner surface of the opening. Permanent magnets 591 and 592 to be opposed
Is glued. That is, yokes 581 and 582 are formed at the other end of the input shaft 61.

The input shaft 61 is rotatably supported by a housing 62 made of a synthetic resin. The input shaft 61 is located at a position facing the end face on which the permanent magnets 591 and 592 of the input shaft 61 are set. The printed board 63 is mounted so as to have a plane orthogonal to the axis of the input shaft 61. Although not shown in detail, electronic circuit components such as an amplifier circuit using a large number of electronic elements are mounted on the printed board 63, and a hall element 64 for angle detection is further mounted. .

The Hall element 64 is mounted and supported on the tip of a support member set perpendicular to the surface of the printed board 63, and is located at an intermediate position between the permanent magnets 591 and 592 mounted on the input shaft 61. That is, it is arranged at a position that coincides with the axis of the input shaft 61. And
The opening of the portion of the housing 62 where the printed board 63 is set is sealed by the cover 65 and the packing.

[0010] However, the structure of the rotation angle detecting device thus configured requires a large number of parts and increases the manufacturing cost. In order to reduce the number of components, for example, as disclosed in Japanese Patent Application Laid-Open No. 2-285212, it is conceivable to integrate an amplifying circuit, an adjusting circuit, and the like, including a magneto-sensitive element including a Hall element 64.

When an amplifying circuit and an adjustment circuit are integrated together with a magneto-sensitive element to form an IC chip, the magneto-sensitive element is first formed by forming a pattern of a magnetically responsive material on an insulating film. Since the electronic circuit element is combined with the element on the same film, the direction of the film surface is parallel to the printed board. On the other hand, since the magnetic sensing direction of the magnetic sensing element is perpendicular to the film surface, an appropriate magnetic field (parallel magnetic field) cannot be applied only from one side of the film.

That is, in order to apply a rotating magnetic field to this magneto-sensitive element, a magnetic circuit must be configured so as to sandwich the printed board. And the magnetic circuit interfere with each other, and in the structure as shown in FIG. 8, the sensitivity element formed as an IC cannot be used.

As a method of adjusting the characteristics of such a magneto-sensitive element, a plurality of resistors are set inside an integrated circuit, and a fuse is arranged in parallel with the resistors, and whether or not the fuse is blown is selected. It is known to adjust the resistance value set in the circuit. However, in order to improve the accuracy of the adjustment, a large number of terminals for adjustment are required, and the size of the integrated IC chip is also increased, so that the adjustment terminal is drawn out of the sensor including the IC chip. Then, the size of the sensor body also increases.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and enables adjustment of assembled components even when the components are sufficiently simple, and is easy to handle. It is an object of the present invention to provide a rotation angle detection device that can be configured with high accuracy by using a rotation angle detection device.

[0015]

A rotation angle detecting device according to the present invention includes a housing, a sensing unit provided in the housing, for detecting a rotation angle of a rotating body to be measured, and an output characteristic of the sensing unit. Adjusting means for adjusting from outside the housing via a terminal.

[0016]

In the rotation angle detecting device constructed as described above, the output characteristics of the sensing unit for detecting the rotation angle of the rotating body to be measured can be adjusted from outside the housing via a terminal. It is possible to make adjustments in a mounted state including variations in the rotation angle, and it is possible to provide a rotation angle detection device that is easy to handle and can be configured with high accuracy.

[0017]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a sectional configuration of a rotation angle detecting device, which is configured, for example, to detect a rotation angle amount of a throttle valve 12 constituting a throttle valve member 11. For this reason, an input shaft 14 that is rotated integrally with the throttle valve 12 is set in a housing 13 integrally formed with the throttle member 11, and the input shaft 14 is formed in the housing 13. The rotation member 15 is connected to the rotation member 15 and is rotated integrally with the throttle valve 12 driven in response to the depression operation of an accelerator pedal (not shown).

A yoke 16 made of a magnetic material is integrally attached to the rotary member 15, and the yoke 16 has a pair of yoke pieces 161 and 162. Permanent magnets 171 and 172 are attached to opposing surfaces of the yoke pieces 161 and 162, respectively, by bonding or the like, so that a parallel magnetic field is set therebetween. That is, a parallel rotating magnetic field that rotates with the rotation of the throttle valve 12 is set.

As described above, the housing 13 formed of a resin molded body is combined with the housing 13 that rotatably holds the rotation member to be measured 15 integrated with the yoke 16. The sensor body 22 is constituted by the parts. A sensing unit 23 is set inside the housing 21. The sensing unit 23 includes, for example, an EPR which constitutes an amplification circuit and an adjustment circuit thereof together with the magneto-sensitive element as shown in FIG.
It has an IC chip 24 in which the OM and the register are integrated into one chip.

The IC chip 24 is mounted on a lead frame 25 which also serves as a wiring and a connector terminal of the sensor main body 23. The lead portion of the lead frame 25 and the IC chip 24 are appropriately connected by bonding. Is done. An output terminal 251 and an adjustment terminal 252 as the sensor body 22 are provided in the lead frame 25 in a later process.
In particular, by mounting by resin molding as shown by a broken line in FIG. (A), the sensing unit 23 as shown in FIG. (B) is completed.

Here, the main body 231 of the sensing unit 23 in which the main part of the lead frame 25 is embedded is formed in a flat plate shape, and an opening is formed corresponding to the IC chip 24. The IC chip 2 is located in the opening.
4 is resin-molded together with an electronic circuit element, and an IC built-in portion 241 as a magnetic sensing portion is set. The IC built-in portion 241 is set up in a direction perpendicular to the plane of the main body 231. I have. That is, by bending the lead piece connecting the IC chip 24 and the lead frame 25 at a right angle, the magnetically sensitive surface of the magnetically sensitive element set in the inside of the IC built-in part 241 is particularly improved. It is set to be perpendicular to the part 231.

The sensing unit 2 configured as described above
3 is molded with resin so that the housing 2
In this housing 21, an IC built-in portion 242 that rises vertically from the surface of the main body portion 241 is provided.
Are projected into a peninsula shape. Then, with this housing 21 combined with the housing 13, an IC
Penetrated peninsula part 211 of built-in part 241
Are arranged between the pair of yoke pieces 161 and 162 of the yoke 16. That is, the permanent magnets 17 attached to the yoke pieces 161 and 162, respectively.
Intersecting the parallel magnetic field between 1 and 172, IC chip 2
4, especially the magneto-sensitive surface of the magneto-sensitive element is set.

FIG. 3A shows the sensor body 22 taken out, and shows a cylindrical portion 22 to which the housing 13 is connected.
1 and a peninsula 211 is protruded from a central portion thereof.
FIG. 2B shows a yoke 16 arranged inside the housing 13.
The plate member made of a magnetic material is bent into a U-shape to form a pair of yoke pieces 161 and 162. The permanent magnets 171 and 172 are adhered to the opposing surfaces of the yoke pieces 161 and 162, and the connecting piece 163 connecting the yoke pieces 161 and 162 is connected to the rotating member 15 connected to the input shaft 14. Be integrated.

In the rotation angle detecting device constructed as described above, when the throttle valve 12, which is the test object, is rotated in response to the operation of the accelerator pedal or the like, the rotation member 15 is integrally formed therewith. Is rotated, and the yoke 16 is rotated accordingly. When the yoke 16 is rotated, the yoke pieces 161 and 162 are integrally combined with the permanent magnets 171 and 172.
Together with each other in a parallel plane, and a parallel equal magnetic field is rotated in a plane. Therefore, the permanent magnets 171 and 17
The magnetic field that crosses the peninsula 211 having the built-in IC built-in portion 241 of the sensing unit 23 disposed therebetween is rotated.

Here, the yoke pieces 161 and 1 of the yoke 16
And the parallel magnetic field set between 62 and
Assuming that the rotation angle of the yoke 16 is θ, the peninsula 211
The effective magnetic field H applied to the magneto-sensitive element constituting the IC chip 24 set inside the IC varies according to H = Ho sin θ.

For example, when the magneto-sensitive element is constituted by a Hall element, the output voltage V from the magneto-sensitive element becomes V = Vo sin θ due to the Hall effect (where Vo is “H = Ho” Output voltage).

The method of adjusting the output characteristics and the like of the magneto-sensitive element is based on the EPR integrated as an IC chip.
The adjustment is performed by the OM and the register, and an adjustment terminal 252 is used.
By inputting a series of electric signals from the sensor, the inclination (amplification) and the offset (bias), which are sensor output characteristics, are adjusted.

In the rotation angle detecting device constructed as described above, the IC chip 2 in which the magnetic sensing element, the amplifying circuit, the adjusting circuit and the like which are the internal functional parts of the sensor body 22 are integrated.
4, a connector terminal composed of the output terminal 251 of the sensor body 22, and a lead frame 25 formed by press working for wiring the connector terminal and the IC chip 24 as a sensing unit 23 by resin molding. Have been. Therefore, the number of assembling steps for each of these components is reduced.

Further, the sensing unit 23 integrated in this way has a housing 21 formed by inserting it into a resin. At the same time, it is possible to reduce the number of components such as a cover and packing for sealing the opening of the electronic circuit assembling portion with respect to the housing 21, and the fixing state of the sensing unit 23 is extremely stabilized, and the durability is improved. It is said to be rich in sex.

Further, the IC chip built-in portion 241 including the magneto-sensitive element of the sensing unit 23 is configured to protrude as a peninsula portion 211 in the housing 21, and the housing 21 is combined with the housing 13 connected to the subject. The peninsula 211 is the permanent magnet 2 of the yoke 16.
It is located between 71 and 272. Therefore, a magnetic circuit that is hardly affected by an error in the relative position between the rotating permanent magnets 271 and 272 and the magneto-sensitive element is configured, and the “parallel magnetic field rotation type” can be effectively applied.

In addition, by incorporating an EPROM and a register in the IC chip 24 as adjustment means, it is possible to adjust output characteristics using several adjustment terminal structures. By leading the sensor to the outside of the sensor main body 22 through the lead frame 25, the adjustment in the assembled state including the variation of the magnet is enabled.

FIG. 4A shows another example of the sensing unit 23, and FIG. 4B shows the sensor unit 22 inserted into the resin by inserting the sensing unit 23 into a resin.
Is shown. That is, the sensing unit 23 shown here uses the output terminal 251 as an IC.
This IC should be aligned with the direction in which the built-in portion 241 extends.
A connector structure including the output terminal 251 is formed so as to extend to the side opposite to the built-in portion 241 and to the side opposite to the coupling surface of the housing 21 with the housing 13.

FIG. 5 shows still another embodiment of the sensing unit 23. In this embodiment, a first IC built-in section 31 containing a magneto-sensitive element, an amplifier circuit and the like, and an adjustment circuit etc. are built-in. The second IC built-in section 32 is divided into two parts, and both parts are attached to one lead frame. Then, when the first IC built-in portion 31 including the magnetic sensing element is planted and formed into a housing by resin molding as the sensor body, a pair of permanent magnets set in the yoke of the housing is formed. It is adapted to form peninsulas located between each other.

FIGS. 6A and 6B show still another embodiment of the sensing unit 23.
(A) In the example of the figure, the lead out of the IC built-in part 241 and the lead frame 25 are separately formed, and are integrated by spot welding 35 to each other. Also, in the example of FIG.
The lead frame 25 and the lead frame 25 are separately formed, and are mutually integrated by spot welding 37. That is, in the example shown in FIG. 6, the lead terminal of the IC chip, the connector terminal, and the lead frame are separately formed, and are connected using the spot welding means. Constitutes an integrated sensing unit 23.

[0035]

As described above, according to the rotation angle detecting device of the present invention, the output characteristics of the sensing unit for detecting the rotation angle of the rotating body to be measured can be adjusted from outside the housing via the terminal. Therefore, it is possible to perform adjustment in a mounted state including variations in magnets, and a magnetic field rotation type rotation angle sensor mechanism that is easy to handle and can be configured with high accuracy can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional configuration diagram illustrating a rotation angle detection device according to an embodiment of the present invention.

FIG. 2A is a plan view for explaining a process of creating a sensing unit in the embodiment, and FIG. 2B is a diagram showing a completed sensing unit.

3A is a view showing the sensor body taken out, and FIG. 3B is a view showing the yoke part taken out.

FIG. 4A is a diagram showing a second embodiment of the sensing unit, and FIG. 4B is a cross-sectional view showing a sensor main body in which the sensing unit is built.

FIG. 5 is a diagram showing a third embodiment of the sensing unit.

FIGS. 6A and 6B are diagrams illustrating fourth and fifth examples of a sensing unit, respectively.

FIGS. 7A to 7C are diagrams illustrating a basic configuration example of a rotation angle sensor using a magnetic field.

FIG. 8 is a cross-sectional configuration diagram illustrating a conventional rotation angle detection device.

[Explanation of symbols]

 11: throttle valve member, 12: throttle valve, 13: housing, 14: input shaft, 15: rotating member, 16: yoke, 161, 162: yoke piece, 171, 172: permanent magnet, 21: housing, 211 ... Peninsula part, 22: Sensor body, 23: Sensing unit, 24: IC chip, 241: IC built-in part, 25: Lead frame.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2F063 AA35 BA06 CA34 DA01 DC08 GA52 2F077 AA11 AA46 JJ08 JJ09 JJ23 VV02 VV10 VV31 VV33

Claims (5)

[Claims] 1. A housing, a sensing unit provided in the housing, for detecting a rotation angle of a rotating body to be measured, and adjusting means for adjusting output characteristics of the sensing unit from outside the housing via a terminal. And a rotation angle detection device. 2. The rotation angle detecting device according to claim 1, wherein said adjusting means includes an EPROM and a register. 3. The rotation angle detection device according to claim 1, wherein the housing is formed by resin-molding the terminal, and the adjustment unit and the sensing unit are provided in the housing. 4. A support for a rotating body to be measured is constituted, and
A sensing unit including a magnetic sensing element, wherein the sensing element is located in a space formed by the housing and the housing, and is provided to protrude from the housing. 4. The rotation angle detection device according to claim 3, wherein the rotation angle is detected. 5. The rotation angle detecting device according to claim 4, wherein a magnet is provided on the rotating body to be measured in a non-contact state with the magneto-sensitive element.