JP2597510Y2 - Magnetic sensor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic sensor used for detecting a rotation speed and the like.

[0002]

2. Description of the Related Art As a conventional magnetic sensor for detecting the number of revolutions, there is a magnetic sensor disclosed in Japanese Utility Model Laid-Open Publication No. Hei 4-21962. In these, a housing having a built-in magnetically sensitive element and a terminal for outputting an electric signal detected by the magnetically sensitive element to the outside is integrally formed of resin.

[0003]

However, in the magnetic sensor, the magnetic sensitive element and the electronic component are attached to the terminal, and the main part of the magnetic sensitive element, the electronic component, and the terminal are integrally covered with resin and formed. However, stress is likely to be applied to each part due to expansion and contraction of the resin due to temperature changes under the conditions of use, and this stress may cause a short circuit at the soldering point between the terminal and each part. In order to mold a weak magnetically sensitive element with a resin, the resin material used for the housing is limited so as not to break the magnetically sensitive element, and further, there are limitations such as that the magnetic sensor cannot be used under high temperature and high pressure conditions. .

[0004]

In order to solve the conventional problems, the present invention has a terminal for outputting an electric signal corresponding to a magnetic change detected by a magnetic sensing element to the outside,
And disposing the magnetic sensitive element to the distal end, the inner case having a connector portion for deriving the terminal and housing chamber for housing the Ma Gunetto, the inner case is assembled
Magnetic sensor comprising:
In the inner case and the outer case,
Between the outer casing and the outer case.
Between the bottom of the inner surface and the tip of the inner case.
A magnetically sensitive element is arranged and routed on the side of the storage room
The electronic component electrically connected to the terminal
Characterized in that disposed in the portion, also, the opening of the outer case, covered with a sealing member in the vicinity entire circumference molded with a resin and a portion of the inner case adjacent to the opening
It is characterized in that Tsu.

[0005]

According to the above construction, the influence of heat, pressure and the like of the magnetically sensitive element during the manufacture of the magnetic sensor is reduced, and the resin material used for the magnetic sensor is not limited.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a side view of the embodiment, FIG. 3 is a sectional view of an inner case of the embodiment, and FIG. 4 is an electronic component of the inner case of the embodiment. FIG. 5 is a cross-sectional view in which the magnetic sensor of the embodiment is assembled to a main body.

As shown in FIGS. 1 to 4, the magnetic sensor 1 of the present invention comprises an inner case 2 made of a synthetic resin, an outer case 3 also made of a synthetic resin, and the inner case 2 and the outer case 3 assembled. And a sealing member 4 formed of a resin after being found.

The inner case 2 forms a housing 2A for housing the magnet 5 and a connector 2B, and outputs an electric signal output from the Hall IC 6 as a magnetically sensitive element to the outside via the connector 2B. A part of the terminal 7 is built in. A gap 8 formed when the inner case 2 and the outer case 3 are assembled is surrounded by the yoke 9 on the three sides of the main body 6A at the position of the inner surface bottom 3A of the outer case 3 and the tip 2C of the inner case 2. The lead 6B of the Hall IC 6 is electrically connected to the end of the terminal 7. In this gap 8, a chip component 10, which is an electronic component, is disposed between the terminals 7 arranged on the side surface of the storage chamber 2A and electrically connected by means such as soldering.

The outer case 3 is a cylindrical body with a bottom for housing the storage chamber 2A side, and the inner case 2 is assembled to the outer case 3. The assembled inner case 2 and outer case 3 are connected to the opening 3B of the cylindrical body of the outer case 3 and the inner case 2 adjacent thereto.
A sealing member 4 made of a synthetic resin is formed on the entire periphery of a portion near the part. The sealing member 4 seals the magnetic sensor 1. For this reason, it is not necessary to perform special sealing with a resin molding material or the like. Further, since the position for molding the sealing member 4 is a position away from the Hall IC 6, the pressure and heat generated at the time of molding the sealing member 4 are reduced. Since it is difficult to be transmitted to the hole IC 6, a thermosetting resin or the like is injected into the gap 8 formed between the inner case 2 and the outer case 3 to form the hole I.
Since it is not necessary to protect and fix the position of C6,
Man-hours can be reduced.

FIG. 5 shows a magnetic sensor 1 according to the present invention,
For example, it is a diagram assembled to a vehicle mission, in which an O-ring 12 is fitted into a concave portion 4A provided on the entire circumference of a sealing member 4, this magnetic sensor 1 is pressed into a main body 11, and a claw portion 11 of the main body is inserted.
By caulking A, the magnetic sensor 1 is fixed. After the assembly, the rotation is transmitted from the vehicle (not shown) to the rotor 13, and the magnetic fluctuation caused by the rotation is detected by the Hall IC 6 of the magnetic sensor 1, and output to a display device such as an instrument (not shown) by a wiring member (not shown). I do.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the magnetically sensitive element is not limited to only the Hall IC 6. Any member may be used as long as it responds to magnetism.

[0012]

[Effects of the Invention] The inner case and the outer case are assembled, and each part is disposed in a gap between the cases. The entire vicinity of the opening of the outer case and a part of the inner case adjacent to the opening is provided. By forming a sealing member around the circumference, it is possible to obtain a stable quality magnetic sensor with little influence on the magnetic sensitive element such as heat and pressure generated in the magnetic sensor manufacturing process, and further reduce the number of processes. realizable.

[Brief description of the drawings]

FIG. 1 is a sectional view of one embodiment of the present invention.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a sectional view of the inner case of the embodiment.

FIG. 4 is an exemplary side view of the inner case of the embodiment in which electronic components and the like are assembled.

FIG. 5 is a cross-sectional view in which the magnetic sensor of the embodiment is assembled to a main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic sensor 2 Inner case 2A Storage room 2B Connector part 2C Tip part 3 Outer case 3A Bottom part 3B Opening 4 Sealing member 5 Magnet 6 Hall IC (magnetic sensitive element) 7 Terminal 8 Void 10 Chip component (electronic component)

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) G01P 1/00-3/80 G01D 5/12-5/252

Claims (2)

(57) [Scope of request for utility model registration] [Claim 1, further comprising a terminal for outputting an electrical signal corresponding to the magnetic change detected by the magnetic sensitive element to the outside, and disposing the magnetic sensitive element to the tip portion, wherein a housing chamber for housing the Ma Gunetto terminal An inner case having a connector part for leading out, and a bottomed cylindrical shape to which the inner case is attached.
And a body outer case,
A gap between the inner case and the outer case
A bottom portion of the inner surface of the outer case within the gap.
And the magnetic sensitive element between the inner case and the tip of the inner case.
And a child is arranged and routed to the side of the storage room.
An electronic component electrically connected to the terminal is disposed in the gap.
A magnetic sensor, characterized in that the. 2. An entire periphery of an opening of the outer case and a part of the inner case adjacent to the opening is covered with a sealing member molded of resin. Magnetic sensor.