JPH0676864U - Magnetic sensor - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a magnetic sensor that can be used under conditions of high temperature and high pressure and is not easily affected by heat and pressure generated during the manufacturing process. [Constitution] Inner case 2 with a part of terminal 7 built-in
, The Hall IC 6 and the chip component 10 are electrically connected,
The Hall IC 6 side of the inner case 2 is inserted and assembled into the outer case 3 having a cylindrical body with a bottom, and the opening 3B of the outer case 3 and the entire circumference in the vicinity of the inner case 2 adjacent thereto are sealed with resin. Mold 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic sensor used to detect the number of revolutions and the like.

[0002]

[Prior art]

 Conventionally, as a magnetic sensor for detecting the number of revolutions, there is one disclosed in Japanese Utility Model Publication No. 4-21962. These are integrally formed of resin with a housing having a magnetic sensitive element and a terminal for outputting an electric signal detected by the magnetic sensitive element to the outside.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned magnetic sensor, the magnetic sensitive element and the electronic component are attached to the terminal, and the magnetic sensitive element, the electronic component, and the main part of the terminal are integrally molded with the resin. Due to the expansion and contraction of the resin due to changes, stress is likely to be applied to each component, and this stress may short-circuit the soldering points between the terminals and each component. For molding, the resin material used for the housing is limited so as not to destroy the magnetic sensitive element, and the magnetic sensor is also not applicable under high temperature and high pressure conditions.

[0004]

[Means for Solving the Problems]

 Therefore, 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 the magnetic sensitive element to the outside, and the magnetic sensitive element is provided at the front end portion. A bottomed cylinder having an inner case having a storage chamber for storing a magnet therein and a connector for leading out the terminals, and a void portion formed between the side of the inner case to cover the storage chamber side of the inner case. It is characterized by comprising an outer case in the form of a sheet, and an electronic component electrically connected to the terminal arranged around the void, and the opening of the outer case and the opening. And a sealing member formed of a resin that covers the entire circumference in the vicinity of a part of the inner case adjacent to the inner case.

[0005]

[Action]

 With the above structure, the influence of heat, pressure, etc. of the magnetic sensitive element during manufacturing of the magnetic sensor is reduced, and the resin material used for the magnetic sensor is not limited.

[0006]

【Example】

 Hereinafter, the present invention will be described with reference to FIGS. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a side view of the same embodiment, FIG. 3 is a sectional view of an inner case of the same embodiment, and FIG. 4 is an electronic component of the inner case of the same embodiment. FIG. 5 is a side view in which the magnetic sensor of the embodiment is assembled, and FIG.

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

The inner case 2 forms a storage chamber 2A for storing the magnet 5 and a connector portion 2B, and an electric signal output from the Hall IC 6 which is a magnetically sensitive element is externally transmitted via the connector portion 2B. It incorporates part of the output terminal 7. A body 8 surrounds the inner case 2 and the outer case 3 in a space 8 formed when the inner case 2 and the outer case 3 are assembled, at the position of the inner surface bottom 3A of the outer case 3 and the tip 2C of the inner case 2, and the body 6A is surrounded by the yoke 9 on three sides. The Hall IC 6 is provided, and the lead 6B of the Hall IC 6 is electrically connected to the end of the terminal 7. Further, in the void portion 8, a chip component 10 which is an electronic component is disposed between the terminals 7 which are arranged around the side surface of the storage chamber 2A and electrically connected by means such as soldering.

The outer case 3 is a bottomed cylindrical body that houses the storage chamber 2 A side, and the inner case 2 is assembled to the outer case 3. The assembled inner case 2 and outer case 3 are covered with a synthetic resin sealing member 4 around the entire circumference of the cylindrical opening 3B of the outer case 3 and a part of the inner case 2 adjacent to the opening 3B. To mold. The magnetic sensor 1 is sealed by the sealing member 4. Therefore, it is not necessary to perform special sealing with a resin molding material or the like, and since the position where the sealing member 4 is molded is a position away from the Hall IC 6, the pressure and heat generated during the molding of the sealing member 4 can be reduced. Since it is difficult to transmit to the Hall IC 6, it is not necessary to inject a thermosetting resin or the like into the space 8 formed between the inner case 2 and the outer case 3 to protect and fix the position of the Hall IC 6. The number of steps can be reduced.

FIG. 5 is a view of the magnetic sensor 1 of the present invention assembled in a main body 11, for example, a mission of a vehicle, in which an O-ring 12 is fitted in a recess 4 A provided all around the sealing member 4. The magnetic sensor 1 is press-fitted into the main body 11 and the claw portion 11A of the main body is caulked to fix the magnetic sensor 1. After the assembly, the rotation is transmitted from the vehicle side (not shown) to the rotor 13, and the Hall IC 6 of the magnetic sensor 1 detects the magnetic fluctuation caused by the rotation, and the wiring member (not shown) causes a display device such as an instrument (not shown) Output to.

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

[0012]

[Effect of device]

 Assemble the inner case and outer case, arrange each part in the space between the cases, and seal the entire circumference in the vicinity of the opening of the outer case and part of the inner case adjacent to this opening. By molding the member, it is possible to obtain a magnetic sensor of stable quality and to reduce the number of steps, because the heat and pressure generated in the manufacturing process of the magnetic sensor have little influence on the magnetic sensitive element.

[Brief description of drawings]

FIG. 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 cross-sectional view of the inner case of the same embodiment.

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

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

[Explanation of symbols]

 1 Magnetic Sensor 2 Inner Case 2A Storage Room 2B Connector 2C Tip 3 Outer Case 3A Bottom 3B Opening 4 Sealing Member 5 Magnet 6 Hall IC (Magnetic Sensitive Element) 7 Terminal 8 Void 10 Chip Component (Electronic Component)

Claims (2)

[Scope of utility model registration request] 1. A storage chamber having a terminal for outputting an electric signal corresponding to a magnetic change detected by a magnetic sensitive element to the outside, the magnetic sensitive element being arranged at a tip portion, and a magnet being housed therein. An inner case having a connector portion for leading out terminals, an outer case of a bottomed tubular body that covers the storage chamber side of the inner case and forms a gap between the side surfaces of the inner case, and is routed through the gap. A magnetic sensor comprising: an electronic component electrically connected to the provided terminal. 2. A sealing member formed of a resin that covers the entire circumference in the vicinity of the opening of the outer case and a part of the inner case adjacent to the opening. 1. The magnetic sensor according to 1.