JPH02242183A - Hall-effect type sensor apparatus - Google Patents

Abstract

PURPOSE:To omit a fixing jig in heating and drying by providing a plate which is supported with a molded frame through a gap part with respect to a magnetic-flux generating member and a Hall element which is fixed on the surface that is opposite to said gap part. CONSTITUTION:When the cut part of a magnetic shutter 14 is located at a gap part G by the rotation of an internal combustion engine and the like, the magnetic flux which is generated with a magnetic-flux generating member 3 forms a magnetic path shown by a broken line A. The magnetic flux acting on a Hall element 4 becomes a 'large' state. When the magnetic body part of the magnetic shutter part 14 is located at the gap part G, the magnetic path is shorted, and the magnetic flux which is generated with the magnetic-flux generating member 3 formes a magnetic path shown by a broken line B. The magnetic flux acting on the Hall element 4 becomes a 'small' state. The change in magnetic flux in synchronization with the rotation of the internal combustion engine is imparted to the Hall element 4. An electric signal corresponding to the change in magnetic flux due to the Hall effect is generated. The electric signal is guided to an external circuit through a connector part 1d, and the waveform is processed. Thus the objective crank angle is detected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a Hall effect sensor device that can be preferably used, for example, for detecting a crank angle in an ignition timing control device for an internal combustion engine.

[Conventional technology]

Conventionally, various sensor devices using the Hall effect, such as position sensors, angle sensors, and speed sensors, are well known.
Hall ICs, in which a Hall element used in such a sensor device is provided as a hybrid integrated circuit on a substrate made of ceramic or the like, are also well known. A Hall effect sensor device for controlling ignition timing of an internal combustion engine is also known, in which such a Hall IC is integrated with a magnetic circuit into a case or frame.

[Problem to be solved by the invention]

In the conventional Hall effect type sensor device as described above, components such as Hall ICs and magnetic circuit components are positioned and fixed using jigs for each item, and in that state, thermoplastic resin or thermosetting resin is used. The process involved injecting and drying or curing in a heating oven, which required a large number of positioning jigs.
There were problems in that positioning accuracy was poor, making it unsuitable for mass production, and signal accuracy was poor.

This invention was made in order to solve the above-mentioned problems, and to obtain a Hall effect sensor device that does not require a jig when heating and drying resin, has high signal accuracy, and can easily automate assembly. With the goal.

[Means to solve the problem]

The Hall effect type sensor device according to the present invention includes a mold frame, a magnetic flux generating member having a magnet held by the mold frame, and a plate held by the mold frame through a gap portion with respect to the magnetic flux generating member. , and a Hall element fixed to the surface of the plate opposite to the gap portion.

[Effect]

The plate in the present invention is positioned relative to the mold frame, and the Hall element is positioned and fixed to this plate.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

1 and 2 are cross-sectional views showing essential parts of a Hall effect type sensor device according to an embodiment of the present invention.

This embodiment is suitable as a sensor device for detecting the crank angle of an internal combustion engine.

In the figure, (1) is a mold frame, which includes a locking part (1a) of the plate 2), a locking part (1b) of the magnetic flux generating member 3), and a housing part (4) for the Hall element (4), etc. 1c)
and an insert conductor (5) is embedded therein, and a connector portion (1d) is provided at one end in a line fishing manner.

Note that a plurality of insert conductors (5) are provided in a direction perpendicular to the plane of the drawing. In addition, the magnetic flux generating member (3
It consists of a monthly magnet (31) and a magnetic flux guide (32), and the locking part (1b) of the mold frame (1).
) is positioned and fixed. The plate (2) is made of metal, plastic, etc., and the magnetic flux generating member (3)
It is arranged through a gap part G and fixed to the locking part (1a). (6) is an insulating film provided on the back side of the plate (2), (7) is a printed conductor formed on this insulation M (6), and (8) is a predetermined portion of this printed conductor (7). The provided solder bumps (9) are, for example, electronic components such as surge protection elements. The Hall element (4), electronic component (9), etc. are positioned and fixed to the plate (2) via the solder bump (8). (10)
is a magnetic flux guide member fixed to the cover (12) with an adhesive (11). The cover (12) covers the accommodating part (1c) and attaches to the mold frame (1) as shown in the figure.
is fixed. Note that the space around the Hall element (4), magnetic flux guide member (10), etc. in the accommodating part (IC) is filled with resin such as silicone gel, etc.
Protected from the surrounding environment (not shown) (13
) is a bonding wire that electrically connects a predetermined portion of the printed conductor (7) and one end of the insert conductor (5).

(14) is a magnetic flux shutter disposed to move within the gear part G, and although the details are omitted from the drawings, as a typical example, the magnetic material is formed into a disc shape or a cylindrical shape, and a disc The outer periphery of a cylinder or the cylindrical body part of a cylinder is cut out at a predetermined angle, and the inner part of the gear part G is cut out with the cut out part. It is driven to rotate so that the parts of the magnetic material that are not in contact with each other are moved alternately. Note that this magnetic flux shutter (1
4) may be configured to rotate in synchronization with the internal combustion engine (not shown). Furthermore, the Hall element (4) is not limited to a Hall IC chip, but may be, for example, a bare Hall chip or It may also be a hybrid integrated circuit on a substrate together with other electronic components, and in this book, any of these will be referred to as a Hall element.

Next, the operation will be explained. When the cutout part of the magnetic flux shutter (14) is located in the gap part G due to the rotation of the internal combustion engine, the magnetic flux generated by the magnetic flux generating member (3) mainly forms a magnetic path shown by the broken line A in FIG. , the magnetic flux acting on the Hall element (4) becomes r large. When the magnetic body part of the magnetic flux shutter (14) is located in the gap part G, the magnetic path is short-circuited and the magnetic flux generated by the magnetic flux generating member (3) forms a magnetic path shown by the broken line B, and is directed to the Hall element (4). The acting magnetic flux is in a "small" state. Thus, a change in magnetic flux synchronized with the rotation of the internal combustion engine is applied to the Hall element (4), and an electric signal corresponding to the change in magnetic flux is generated due to the Hall effect. This electrical signal is transmitted to the connector cover (
The target crank angle can be detected by guiding the signal to an external circuit (not shown) via Id) and processing the waveform. Note that the above-mentioned signal processing and the like are well-known matters, so a detailed explanation will be omitted.

As mentioned above, in the embodiment of the present invention, the Hall element (4) is connected to the mold frame (1) via the plate (2).
), there is no need for a jig for positioning and fixing the Hall element (4) during heating drying. Further, the Hall element (4) is positioned by fitting it into the solder bump 8).

This attachment can be easily performed using an assembly robot, for example, to easily improve the positioning accuracy. Therefore, according to the above embodiment, a sensor device with high signal accuracy can be constructed, and assembly can be easily automated.

In the above embodiment, the plate (2) is provided with an insulating film (6), a printed conductor (7), etc., but these may not necessarily be provided.For example, when an insulator is used as the material of the plate (2), The insulating film (6) is not required for
Furthermore, when a hybrid IC formed on a substrate is used as the Hall element (4), the printed conductor (7) is also unnecessary.

In addition, the mold frame (1) may be used as a primary mold, for example.
The magnetic circuit for the Hall element (4) may be formed in stages such as by secondary molding. ,
The shape of the magnetic flux shutter (14) and the like are also not limited to those of the embodiment.

Incidentally, in the above description, the present invention is used for detecting a crank angle for controlling the ignition timing of an internal combustion engine, but it can also be used as other sensor devices, such as a position sensor. Further, the magnetic flux shutter may be moved linearly.

In short, the above-mentioned embodiments are merely examples shown to facilitate understanding of the present invention, and it goes without saying that various modifications and changes can be made in addition to the above-mentioned embodiments within the scope of the spirit of the present invention.

〔Effect of the invention〕

As described above, according to the present invention, the mold frame and
a magnetic flux generating member having a magnet held by the mold frame; a plate held by the mold frame through a gap with respect to the magnetic flux generating member;
Since it is configured to include a Hall element fixed to the surface opposite to the gap part of this play 1~, there is no need for a fixing jig during heating drying, the signal accuracy is high, and it is easy to assemble. This has the effect of providing a Hall effect sensor device that is easy to automate.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view showing the main parts of a Hall effect sensor device according to an embodiment of the present invention, and FIG. 2 is a side sectional view taken along the line ■=■ in FIG. In the figure, (1) is a mold frame, (2) is a plate, (3) is a magnetic flux generating member, (4) is a Hall element, and G
is the gap part. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] a mold frame, a magnetic flux generating member having a magnet held by the mold frame, a plate held by the mold frame through a gap portion with respect to the magnetic flux generating member, and a side of the plate opposite to the gap portion. 1. A Hall effect sensor device comprising: a Hall element fixed to a surface of the sensor.