JPH02242181A - Hall-effect type sensor apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a Hall effect type senna device that can be preferably used, for example, in detecting a crank angle in an ignition timing damping 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.
Further, a Hall IC, 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, is 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 using resin.

[Problem to be solved by the invention]

In the conventional Hall effect sensor device as described above, components such as Hall ICs and magnetic circuit components are positioned using jigs for each component, and thermoplastic resin or thermosetting resin is injected in that state. This method requires a large number of positioning jigs and has poor positioning accuracy, making it unsuitable for mass production, and has the problem of poor signal accuracy.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to provide a Hall effect sensor device that is easy to position, has high signal accuracy, and is easy to automate assembly.

[Means to solve the problem]

The Hall effect sensor device according to the present invention is configured such that a mold frame is provided with a mounting portion for the Hall element, and the Hall element is attached to the mounting portion.

[Effect]

The Hall element in the present invention is directly positioned, attached, and held with respect to the mold frame.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the main 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 molded frame made of heat-resistant resin such as PPS, which has a mounting part (11) for a Hall element (2), an insert conductor (3) embedded in it, and a connector part ( 12) are integrally provided. A printed conductor (4) is formed on the mounting part (11), and the lead wire of the Hall element (2) is electrically connected to the printed conductor (4) or insert conductor (3) by paste solder (5). and mechanically retained. (6) is an electronic component such as a surge protection element, and is mounted on the mounting portion (11) together with the Hall element (2). (7) is a magnetic flux generating member, which is composed of a magnet (71) and a magnetic flux guide (72), and is integrally secured to the mold frame (1).

Note that the space around the Hall element (2), electronic component (6), etc. is filled with resin such as silicone gel, etc.
protected. (Illustration omitted) (8) is a magnetic flux shutter disposed to move within the gear part G. Although the details are omitted from the illustration, as a typical example, the magnetic material is rotated in a disk shape or a cylindrical shape. The outer periphery of the disc or the cylindrical body part of the cylinder is cut out at predetermined angles, so that the cut parts and the uncut magnetic material parts move alternately within the gear lug part G. be rotated. In order to use it as a crank angle sensor for an internal combustion engine, the magnetic flux shutter (8) may be configured to rotate in synchronization with the internal combustion engine (not shown). It may be a Hall IC 1 or a bare Hall chip, either of which will be referred to as a Hall element in this book.

Next, the operation will be explained. When the cutout part of the magnetic flux shutter (8) 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 (7) is
A magnetic path mainly indicated by the broken line A is formed, and the Hall element (2
) is in a "large" state. Magnetic flux shutter (
When the magnetic body part 8) is located in the gap G, the magnetic flux generated by the magnetic flux generating member (7) forms a magnetic path shown by the broken line B, and the magnetic flux acting on the Hall element (2) is in a "small" state. becomes. Thus, a change in magnetic flux synchronized with the rotation of the internal combustion engine is applied to the Hall element (2), and an electric signal corresponding to the change in magnetic flux is generated due to the Hall effect. The intended crank angle can be detected by guiding this electrical signal to an external circuit (not shown) via the connector section (12) and subjecting it to waveform processing.

Note that the above-mentioned signal processing and the like are well-known matters, so a detailed explanation will be omitted.

As described above, in the embodiment of the present invention, the Hall element (2) is directly fixed to the mold frame (1), so a positioning jig for the Hall element (2) is not required. Further, it is easy to increase the accuracy of positioning by using, for example, the mounting technology of circuit elements on a printed circuit board to attach the Hall element (2) to the mold frame (1). In addition, the number of parts is small and there are no welding points, so assembly is easy. Therefore, according to the embodiment described above, it is possible to construct a sensor device with high signal accuracy, and the assembly can be easily automated.

FIG. 2 is a cross-sectional view of main parts showing another embodiment of the present invention. In FIG. has been done. (lla) is a housing hole for the Hall element (2), which is provided to penetrate between the attachment part (11) and the gap part G. Other symbols are the same as those in the embodiment shown in FIG. 1, so their explanation will be omitted.

According to the embodiment shown in FIG. 2, since the magnetic flux guide (9) is provided, the magnetic flux density to the Hall element (2) in the state indicated by the broken line A can be increased, and therefore, when the magnetic flux shutter (8) is operated, the magnetic flux density can be increased. Changes in magnetic flux to the Hall element (2) can be increased.

Moreover, the Hall element (2) is sunk into the accommodation hole (lla),
Since the magnetic path in the gap G is shortened, it can be expected that the detection sensitivity will be significantly improved.

FIG. 3 is a sectional view of a main part showing still another embodiment of the present invention, and (2) is a Hall IC chip (flip chip).
(50) is a solder bump. Other symbols are the same as those in the embodiment shown in FIG. 1, so their explanation will be omitted.

In addition to the effects of the embodiment shown in FIG. 1, this embodiment can also be expected to have the effect of making the device more compact by using a Hall element made of a Hall IC chip.

In addition, in the above embodiment, P is used as the mold frame (1).
Although PS resin was used, the material is not particularly limited.Also, although the printed conductor (4) was formed, it does not necessarily have to be a printed conductor.Furthermore, the form of the magnetic circuit for the Hall element (2) is formed. The shape of the magnetic flux shutter (8) 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 is also used for other sensor devices, such as a position sensor. The magnetic flux shutter may also 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 is provided with a mounting part for the Hall element, and the Hall element is mounted on this mounting part, so positioning is easy, signal accuracy is high, and the number of parts is small. This has the effect of providing a Hall effect sensor device whose assembly can be easily automated.

[Brief explanation of drawings]

FIG. 1 is a side cross-sectional view showing the main parts of a Hall effect type sensor device according to one embodiment of the present invention, FIG. 2 is a side cross-sectional view showing the main parts of another embodiment of the invention, and FIG. FIG. 7 is a side sectional view showing a main part of still another embodiment of the invention. In the figure, (1) is a mold frame, (2) is a Hall element, (7) is a magnetic flux generating member, and (11) is a mounting part. In the figures, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] A Hall effect sensor comprising a magnetic flux generating member having a magnet, a Hall element disposed in a magnetic path formed by the magnetic flux generating member, and a mold frame that integrally holds the magnetic flux generating member and the Hall element. A Hall effect type sensor device, characterized in that the mold frame is provided with an attachment portion for the Hall element, and the Hall element is attached to the attachment portion.