JPS58142268A - Magnetic sensor - Google Patents

Abstract

PURPOSE:To elevate the impact resistance and the reliability preventing the deterioration in the connection between a coil and a signal line and the coil by housing a coil with a magnet and a signal line connected thereto in a case while the case is filled with a mold member to shield the connection and the coil from outside air. CONSTITUTION:A coil 16 is housed in a coil housing section 7 in a case body 1 and a permanent magnet 15 in a magnet housing section 8. A signal line 17 is led outside a case body 1 through retaining sections 12 and 14 while the end of a shielded wire 18 is bent in U and retained a round a retaining section 13. The extreme end of the shielded wire 18 extends upto a part of a case body 1 where a surrounding wall 3 doesn't exist. When a molding material 20 such as epoxy resin in the case body 1 housing the permanent magnet 15, the coil 16 and the like is solidified, it shields the magnet 15, the coil 16 and the connection between the coil 16 and the signal line 17 from the outside air. This molding material fills clearances between parts, clearances between parts and the case body 1 and parts exposed to parts except for the extreme end of the shielded wire 18.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic sensor that generates a predetermined voltage in a coil in response to changes in the magnetic flux of a magnet.

The aim is to provide a magnetic sensor with stable quality over a long period of time.

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9.

That is, in the figure, (l) is a case body made of synthetic resin with an open upper end, as shown in detail in FIGS. 3 and 6 to 8, and has a keyhole shape consisting of two circular parts and a rectangular part. It also constitutes a magnetic sensor case together with a cover plate 6B, which will be described later. (2) is the keyhole-shaped bottom wall of the case body (1); 2) nine peripheral walls integrally protruding from the periphery; (4) is a nine first protrusion integrally protruding from both open ends of the peripheral wall (3) and the corresponding bottom wall (2);
It constitutes a part of the 20th locking part 1, which will be described later, and also serves to reinforce both open ends of the circumference 1it31. (5)
is integrally provided on the back surface of the bottom wall (2) of the case body (1).

When the magnetic sensor is placed on the base (2), the circular protrusion for positioning is concentric with the circular part of the case body (1), and when the magnetic sensor is placed on the base (2), it engages with the recess (1) of the base (ω) and the magnetic sensor is It acts to determine the overall position.

(61 is integrally provided on the inner surface of the bottom wall (2) of the case body (1). It is a hollow cylindrical convex wall concentric with the circular part and positioning protrusion (5) of the case body (1), The case body (110) has an annular coil storage part (7) inside the circular part.

This coil storage @ (71 and concentric magnet storage part (8)
It is divided into two parts. Further, the outer diameter of the convex wall (6) is formed to be smaller by a predetermined value than the diameter of the first positioning protrusion (5), and its height is smaller by a predetermined value than the height of the second peripheral wall (13). ing. (9) is an annular step formed around the tip of the convex wall (61), and an annular projection (25) of the cover plate (2), which will be described later, engages with the outer periphery of the annular step.

(8) is a hollow cylindrical magnet housing concentric with the protrusion (51) which faces the first positioning protrusion (5) formed by the convex wall (fi) via the bottom wall (2); (Positioning protrusion (5) by a predetermined dimension from the bottom wall (8) surface where the grain is formed)
Due to the depression, its height is higher than the height of the convex wall (61) by the amount of the depression. This is to accommodate a larger magnet (1! itF) here.

Alternatively, it is an upper second protrusion that is integrally provided on the bottom wall (21'') so as to form a predetermined space between the peripheral wall of the case body (1) and (3), and its height is 1. It is formed to be smaller than the height of the peripheral wall (83) by a predetermined value. al is the height of the first protrusion (4
There are two parallel third protrusions integrally protruding from the bottom wall (21) located in between, the height of which is smaller than the height of the first circumferential wall (3) by a predetermined value. is part of the surrounding wall (2) and part of the bottom wall (2).

and both end surfaces of the second protrusion aQ. Two 10th projections into which the first protrusions (goods) of the cover plate (goods) to be described later fit.
The locking portion also serves to separate and lead out signal lines at+', which will be described later. Pith 1 is the first process (4).

It was formed by the third protrusion an and a part of the bottom wall (2). The two 20th locking parts are the two 20th locking parts that are locked by bending the end of the shielded wire into a IIU shape, which will be described later, and the cover plate (2), which will be described later.
The second protrusion (2) of is fitted. A4 is the third locking part into which the No. So protrusion (2) of the cover plate (goods), which will be described later, fits.

It also serves to hold the signal line aη and the shield line Aη, which will be described later, and also to lead them out to the outside. The case body (1) is constructed as described above.

Alternatively, a cylindrical permanent magnet such as a ferrite magnet stored in the magnet storage 5 (8) of the siliceous body (1).

The outer diameter of the convex wall (61) is smaller than the inner diameter of the convex wall (61) by a dimension that allows a mold member (2), which will be described later, to enter between the convex wall (6) and the height of the i1 stone storage 5 ( 6)
The height is the same as that of a. is the case body (1
) was stored in the coil storage section (7). An annular coil formed by winding an extremely thin conductive wire many times, and its outer and inner diameters are:

The dimensional relationship is taken into consideration so that a mold member, which will be described later, can penetrate between the convex wall (6) and the peripheral wall (3).

Further, its height is selected to be approximately the same as the height of the convex wall (6). The fins are separated at the tenth stop S- by two signal lines connected to the output ends of the coil, respectively, and the third
It serves to transmit the electromotive force generated in the coil a due to the disturbance of the magnetic flux of the magnet to a control circuit (not shown) which is led out to the outside through the zero-locking S axis. Further, this signal fin is connected in advance before the coil head is housed in the case body (1). The end of the trout is bent into a second locking @uKTJ shape, and the trout is locked and led out to the outside through the 30th locking S-axis tube.
electrically connected to. The cod is a repeated part that is repeated on the outer periphery of the signal @an and the shield wire medullary field so as to integrate them together.

(2) has a magnet a9 inside the case body (1). coil aS
, part of the signal line, and part m of the shield 11 are arranged as described above, and then molded with epoxy resin or other material filled in the case body 11 after a predetermined period of time. harden.

And this mold member (1) is this mold member (
When 2) is hardened, the magnet cod, coil aS, coil collection e and signal I! The connection part with aη is the mold member (
2), so that it is isolated from the outside air and does not come into contact with the outside air, and the connection between the magnet, coil ae, coil a and the signal wire fin, the signal wire IO part located inside the case body (1), and In order to firmly hold the ends of the shield wires in their respective predetermined positions, each gap between each component, each gap between each component and the case body 1), and each except for the extreme end S of the shield wire The part of the part exposed to the outside air is filled.

Book a is a keyhole-shaped synthetic resin cover plate that is fitted into the upper opening of the case body (1) as shown in detail in Figures 3 and 4, and the circular part is A predetermined value is set from the circular part of the case body (1) so that a first viewing window (2) is formed between the case body (1) and the first peripheral wall (3) when it is fitted into the upper open part of the case body (1). It is formed small. (2) was integrally protruded from the back of the cover plate ochin. An annular protrusion concentric with the a-th circular part of the cover plate
) of the annular step s (fits into the protrusion) of the convex wall (6). (2) are two first protrusions integrally provided on both sides 11 of the rectangular portion of the deaf cover plate a.

They fit into the tenth locking portions (I) of the case body (1), and the signal wires are held between the bottom wall (2) and the bottom wall (2).

4 are 2 integrally provided at the corners of the rectangular portion of the cover plate a1.
The second protrusion of the case body (1)
At the same time, the shield wire a@ is held between the bottom wall (2) and the bottom wall (2). (to) is a third protrusion that protrudes integrally between the four second protrusions, and the 30th locking part of the case body (1) also fits into the #1 signal line and the shield. The line 1111' is clamped at the threshold with the bottom wall (2). Also, (to) is the center 1f of the circular part of the cover plate (to)
A circular second viewing window formed in IK has a diameter smaller than the diameter of the magnet as. @The third circular viewing window formed in the rectangular part of the expansion plate ofJ.

This is to confirm whether the two signal lines 1n are separated from each other at the tenth locking portion a2. The Obitaguchichin is structured as described above. Then, the cover plate (1) is filled with the mold member (1) as described above, and the 1st protrusion (1) is attached to the 10th lock su of the case body (1) b.
．． In addition, 11E2 is attached to the 20th locking part a3 of the case body (1).
By fitting the protrusions (2) on the upper opening S of the case body (1) and the third protrusions (to) on the 30th locking part a4 of the case body (11), the upper opening S of the case body (1) Outer surface (
The conductive coating containing carbon, binder, etc. is coated on the outer surface of the case body, the outer surface of the cover plate, and the outer surface of the mold member present in the 1st to 30th slots, and the outermost part of the shield wire part and Connected electrically.

As described above, the magnetic sensor according to the embodiment of the present invention is constructed as follows: the case body (1) described above, the coil (Il!, permanent) to which the signal line is connected. Magnet aS and cover plate (to)
Then, store the coil r1e in the coil housing part (7) in the case body (1), store the permanent magnet 11st in the magnet housing part (8), and connect the signal wire to the 10th magnet.
Latch @ (12 and 30th locking part a4 to lead out of the case body (1), and the ends of the shield l1Ial are respectively bent into a U-shape at the 20th locking part opening and locked. At this time, the end of the shield @aS is extended to 16 minutes of the case body (1) where the peripheral wall (3) does not exist.

Next, a mold member made of epoxy resin or the like is placed inside the case body (1) housing the permanent magnets, coils, etc., and when the mold member (2) is hardened, an ia stone a9. The connection between the coil aS and the signal line between the coil a and the signal line is isolated from the outside air by the molded member and does not come into contact with the outside air, and the connection between the magnet, the coil aQ, the coil ring and the signal @an is part, the case body of the signal line (1
1, and the ends of the shield lll-, respectively, are held firmly in place with each gap between each part.

Each gap between each part and Kenneth body (1), and shield @
Fill the outside air mist part of each part except the end of the aS.

Next, before this mold member hardens, cover plate Q-chin is
An annular protrusion (2) is attached to the convex wall (6th annular step t9J) of the case body (1), and the tenth locking part a of the case body (1)
the first protrusion (2), and the second protrusion (2) of the case body (1).
0 locking ill 113 K second protrusion (2), and then the third protrusion cl to the 30th locking Hn of the case body (1).
9. By fitting a into each other. It is firmly fixed to the upper open part of the case body (1) together with the adhesiveness of the mold member (7). In this way, a magnetic sensor main body is manufactured.

Note that at this time, the first to third locking portions Ia8 (signal I! fin and shield lI mouse located at 14).

The bottom wall (2) of the case body (1) and the first to third parts of the cover plate ab
They are each held by the protrusions (goods) ■ (2).

Finally, the mold member hardens after death.

The main body of the magnetic sensor is immersed in the formation of a conductive surface, and is present on the outer surface of the case main body (1), the outer surface of the cover plate aD, and the first to third peepholes (2) In@ part. A conductive coating (2) is formed on the outer surface of the mold member (to), and the shield wire t1s is exposed to the outer ISK during this immersion.
A magnetic sensor is manufactured by electrically connecting the extreme end to the conductive repeat.

The above magnetic sensor is shown in Fig. 1 and 412.
As shown in the figure, a recess (1 mm) formed in one base (4)
Insert the positioning protrusion (6) into the base (A)K.
When the rectangular part of the case body (1) is inserted between the protruding pillars (2 mm), it is installed on the base (2).

When the magnetic flux of the permanent magnet is disturbed by the object to be detected, an electromotive force is generated in the coil.

Note that this electromotive force is transmitted through the signal and signal lI fins to the control circuit wI (
(not shown) and used to obtain desired data.

As explained above, the embodiments of the present invention have various effects as described below. That is, according to this embodiment, the magnet αS is inside the case body (1).

The coil aI to which the signal line aη is connected in advance is housed, and the coil aS is housed in this case body (11).
, @ stone aS , and the mold member @ is filled so as to isolate the connecting part between coil αe and signal @tiη from the outside air, so that the coil aS, i! 1. The connections between the stone Buddha s and the coil a and the signal line fin will not deteriorate due to oxidation, and the case body (11 and molded member (2) Since the connection parts and the like are protected from external shocks, a strong magnetic sensor can be obtained.

The molded member cJn also includes a magnet αS, a coil (
Since each part such as Ie is filled in the case body (1) so as to be fixed, the magnet aS, coil, etc. can be fixed very easily, and this magnetic sensor does not vibrate. Even if it is used in a location where the magnetic sensor is used in a location where the molded member (7) that is fixed to the case main body recess may cause misalignment between each component over a long period of time, the characteristics of the magnetic sensor may change. There will be no combined copies.

In addition, the case body containing the magnets (19 etc.)
), the cover plate (2), etc. are provided with a conductive conductive repeating coating on each outer surface, so if the sensor is not provided with a shielded wire section or a shielded wire that is electrically connected to the conductive repeating covering (4), it is possible to If so, it can be shielded through the conductive S provided on the base (4) or the like and electrically connected to the conductive covering (2), thereby preventing the sensor from malfunctioning due to external noise.

Further, according to this embodiment, since the shield wire tII is provided on the sensor side of 4I, a conductive part corresponding to the lead wire is provided on the base (4) side, and this conductive part and the conductive repeating (extremely ), there is no need to make an electrical connection by contacting them, thereby eliminating the inconvenience of the contact being separated due to vibration or the like. Also, connect the end S of the shield wire to the case body < 1
) is bent into a U-shape at the 20th lock sa3, so the shield wire (2
) can be well secured, and furthermore, after the mold member is made tetravalent, it can be firmly fixed together with the adhesiveness of the mold member (to). In addition, since the shield wire is distributed to the left and right with respect to the lead-out portion, even when the shield wire is pulled from the outside, the force is applied evenly, making it difficult to break the wire. Also, attach the end S of the shield liner to the bottom wall ((9) of the case body (1) and the second protrusion (2) of the cover plate e).
Since it is sandwiched between the mold member (7), the fixing becomes stronger, and the end portion of the shield wire as can be well fixed when the mold member (7) is cured.

In addition, the case body (1) is formed into a keyhole shape, and the coil a+! and a magnet AS, the signal line aη etc. are led out from the rectangular part, and the circular part has a positioning protrusion (
5), the sensor can be easily set to prevent rotation by simply providing a recess (1 person) and a pillar (2 mm) in the base as shown in Figures 1 and 2. The overall shape becomes smaller. In addition, a coil storage (T) smaller than the outer diameter of the positioning projection (5) is provided on the side facing the positioning projection (5), and the bottom surface of this coil storage S- is placed on the positioning projection (5) side. Since it is extended, the entire sensor can be made larger than the magnet asy stored in the coil storage portion, while keeping the shoe body shape small.

Additionally, there is a convex wall (6) inside the circular part of the keyhole-shaped case body (1).
2 is provided, and its interior is divided into an annular coil storage part (7) and a magnet storage part located in the center of this, and each storage part ffl (81 stores a coil salt and a magnet AS, respectively). , and a cover plate *@” on the open top of the case body (1).
Since the coil U and the magnet a9 are provided, the coil U and the magnet a9 can be positioned reliably, flat surfaces can be provided on the upper and lower surfaces of the sensor, and the thickness of the sensor itself can be reduced.

Furthermore, there is also a second page on the above-mentioned cover plate (to). Third peephole @f
:m, and the first one between Ryo Okitaguchi and the case body (1).
A peephole (2) is provided, so when inspecting the sensor after the sensor is completed, the first peephole (2) is provided.
) Is the coil holder stored?

It is possible to check whether the mold member (2) is properly filled, etc., and check whether the magnet is housed in the second observation window. It is possible to check whether the component country is visible, etc., and also check whether the two signal lines I are separated at the tenth stop sI through the third peephole 4, and whether the mold component is visible. It is possible to check whether the tank is properly filled.

According to this embodiment, various effects as described above can be achieved.

In the above embodiments, the case where the conductive skin @ is formed by immersing it in a conductive coating liquid is explained, but the conductive plate is formed into a container shape by press molding, etc., and the sensor is housed in this. Needless to say, you can do it this way.

As described above, according to the present invention, a magnet and a coil in which a signal is subjected to II:IR are housed in a case, and a connection portion between the coil and the signal line, and a coil are isolated from the outside air. Since the connection part between the coil and the signal line and the coil are filled with a molded member that protects the coil from oxidation and deterioration, the connection part and the coil etc. are protected from external shocks due to the molded member of the case. can be protected.

Therefore, a highly reliable magnetic sensor can be obtained.

[Brief explanation of the drawing]

The figures show one embodiment of the present invention. Fig. 1 is a front view showing the entire magnetic sensor and shows the base Km in good condition. Fig. 2 is a sectional view taken along the single layer line of Fig. 1. Fig. 3 , Fig. 4 is an exploded perspective view of the magnetic sensor, Fig. 5 is a front view of the large magnetic sensor with the cover plate removed, Fig. 6 is a front view of the case body of the magnetic sensor, and Fig. 1 is the same as shown in Fig. 6. - ■ cross-sectional view, Figure 8 is 8
11 is a left side view, and FIG. 1 is a bottom view of FIG. 6. Agent Makoto Kuzuno - 1st WJ 1i311 9ri Figure 6 1j /4 Figure 7 Figure 9

Claims (2)

[Claims] (1) A magnetic device is constructed by housing a coil connected to a magnet and a signal line in a case, and filling the case with a connection part between the coil and the signal line, and a molded member that isolates the coil from the outside air. sensor. (2) The magnetic sensor according to claim 1, wherein the mold member also isolates the magnet from the outside air.