JPH10253729A - Magnetic sensor and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic sensor being employed in magnetic encoder, and the like, and a manufacturing method thereof, in which soldering between a plurality of terminal parts and a plurality of electrode parts of a reluctance element is facilitated without applying any external force and without requiring high bending accuracy of the plurality of electrode parts and the plurality of electrode parts are prevented from being stripped off easily due to thermal stress, or the like. SOLUTION: A reluctance element 12 is fixed previously to a holder 11 and a connector 21, including a plurality of external lead-out terminals 21b and a plurality of terminals 21c provided through a bracket 21a, is inserted into the connector inserting part 11c of the holder 11. According to the structure, sufficient contact can be ensured between a plurality of electrode parts 13b of the reluctance element 12 and the plurality of terminals 21c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic sensor and a method for manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, magnetic sensors have been disclosed in
No. 15 is known.

[0003] Hereinafter, a conventional magnetic sensor will be described with reference to the drawings. FIG. 6A is a perspective view of a conventional magnetic sensor, and FIG. 6B is an exploded perspective view of the same.

[0006] In FIG. 6, reference numeral 1 denotes a holder, which comprises a magnetoresistive element mounting portion 1a and a support base 1b. A plurality of external extraction terminal portions 2a and a plurality of terminal portions 2b each connected to them and having one end bent in an L-shape are embedded in the holder 1 in advance in the support base 1b. I have. Reference numeral 3 denotes a side surface of which is regulated by a guide 1c of the holder 1 and a magnetoresistive element mounting portion 1a of the holder 1.
And a plurality of electrode portions 4b and a plurality of terminal portions 2b are magnetoresistive elements which are press-fitted and fitted. The magnetoresistive element 3 has a pattern 4a of the magnetoresistive element 3 and a plurality of electrode sections 4b. Are formed, and the pattern 4 of the magnetoresistive element 3 is formed.
and the plurality of electrode portions 4b are electrically connected. Reference numeral 5 denotes a protective film, which coats the pattern 4a of the magnetoresistive element 3.

A method of manufacturing the conventional magnetic sensor having the above-described structure will be described below.

FIG. 7 is a process diagram of a conventional magnetic sensor.
First, a plurality of electrode portions and N
After depositing a thin film layer made of an iFe film or a NiCo film and forming a predetermined pattern by a photolithography or etching method, a protective film 5 is deposited or printed to form a magnetoresistive element.

On the other hand, a plate-shaped one made of phosphor bronze solder-plated is punched into a predetermined shape of a hoop comprising a plurality of external lead-out terminals and a plurality of terminals, and a predetermined portion of the hoop is subjected to resin molding. A plurality of terminals and a plurality of external lead terminals are cut at predetermined positions, and the plurality of terminals are bent to form a holder.

Finally, the magnetoresistive element is inserted along the guide of the holder and attached to the magnetoresistive element mounting portion.
The magnetic sensor is manufactured by pressing and fitting the electrode terminal portion and the plurality of terminal portions by external stress such as a soldering iron.

The operation of the conventional magnetic sensor constructed and manufactured as described above will be described below.

FIG. 8 is a perspective view showing an example in which a conventional magnetic sensor is incorporated in a magnetic rotary encoder.

As shown in FIG. 8, a magnetoresistive element and a holder are provided inside the rotary encoder 6 at regular intervals facing the outer peripheral surface of a rotary encoder 6 magnetized at a predetermined pitch with N and S poles alternately arranged on the outer periphery. Magnetic sensor 8 is disposed.
As the rotary encoder 6 rotates, the magnetic field crossing the magnetic sensor 8 changes, and the change in the magnetic field is read by the pattern of the magnetoresistive element of the magnetic sensor 8, and the electrically connected electrode terminals and the plurality of terminal portions are read. Through this, the electric signals are output to a plurality of external extraction terminal portions 2a as electric signals, and the rotational speed and the rotational angle of the rotary encoder 6 are detected and controlled.

[0012]

In the above-mentioned conventional configuration,
The method of mounting the magnetoresistive element 3 and the holder 1 is such that one end of the magnetoresistive element 3 is inserted and mounted in a plurality of integrally formed L-shaped bent terminal portions 2b. The bending accuracy of the plurality of terminal portions 2b is considerably required,
For example, if the bending angle of the plurality of terminals 2b is larger than 90 degrees, the magnetoresistive element 3 cannot be inserted. Conversely, if the bending angle of the plurality of terminals 2b is smaller than 90 degrees, the plurality of magnetoresistive elements 3 Since the electrode portion 4b and the plurality of terminal portions 2b are not in contact with each other and are electrically connected, it is necessary to perform soldering by applying pressure by a soldering iron or a thermocompression bonding method while applying an external stress later. However, there is a problem that it is troublesome and it takes a lot of man-hours to mass-produce.

Further, in the conventional configuration, since the plurality of terminal portions 2b are not always bent sufficiently, the plurality of electrode portions 4b are not always bent.
There is a problem that stress is present in a direction in which the terminal portions 2b are to be separated from each other, and the plurality of terminal portions 2b are separated due to thermal stress or the like, and conduction cannot be obtained.

An object of the present invention is to solve the above-mentioned problems and to provide a magnetic sensor which requires less man-hour and a method for manufacturing the same.

[0015]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of mounting a magnetoresistive element having a pattern of a magnetoresistive element and a plurality of electrodes on a holder in advance and connecting a plurality of electrically connected elements. A connector in which an external lead-out terminal and a plurality of terminals are integrally formed on a bracket is inserted and fitted at a predetermined position of a holder.

With this configuration, sufficient contact between the plurality of electrodes and the plurality of terminals of the magnetoresistive element can be obtained, and soldering can be easily performed without applying external stress. Further, the problem that a plurality of terminals are separated due to thermal stress or the like can be solved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a magnetoresistive element mounting portion, a connector insertion portion provided above or below the magnetoresistive element mounting portion, and a support base portion. And a plurality of external lead-out terminals provided via a bracket fitted to the connector insertion portion of the holder, and a plurality of terminal portions electrically connected to the external lead-out terminal, respectively. In the magnetic sensor including a connector, when the connector is fitted into the connector insertion portion of the holder, the electrode portion of the magnetoresistive element having a plurality of electrode portions previously mounted on the magnetoresistive element mounting portion of the holder. And the plurality of terminal portions of the connector are electrically connected, and sufficient contact between the electrode portion of the magnetoresistive element and the plurality of terminal portions of the connector can be obtained. I it with is possible, and has an effect that it is possible to reduce the size.

The invention described in claim 2 is the same as the invention described in claim 1.
In the connector insertion portion of the holder, a locked portion is provided with which a locking portion provided on the bracket of the connector is engaged, and the locking portion and the locked portion are compared with a slope with respect to the insertion direction of the connector. The angle of the inclined surface with respect to the direction in which the connector is pulled out is increased, and has an effect of preventing the connector from coming off the connector insertion portion of the holder.

Further, the invention described in claim 3 is the first invention.
The electrical connection between the plurality of electrode portions of the magnetoresistive element and the plurality of terminal portions of the connector according to the above-mentioned is to connect the bracket and the terminal portion of the connector at an acute angle, and to bend the plurality of terminal portions of the connector. This has an effect that sufficient contact between the electrode portion of the magnetoresistive element and the plurality of terminal portions of the connector can be obtained without requiring much accuracy.

The invention described in claim 4 is the first invention.
Wherein the stopper of the connector is provided with a stopper for restricting the insertion of the bracket by abutting the opening of the connector insertion portion of the support base of the holder, and stopping the insertion of the bracket at a predetermined position. It has an action.

The invention described in claim 5 is the first invention.
The bracket of the connector according to the above is provided with a taper, a plurality of terminal portions in the connector is bent along the taper, when bending a plurality of terminal portions in the connector, acute angle along the taper It has the function of being easily folded.

The invention according to claim 6 is the first invention.
A plurality of grooves are provided in the bracket of the connector according to the above, each of the plurality of terminal portions in the bent connector is mounted in the groove, and each of the plurality of terminal portions in the bent connector is It has the effect of being mounted in a groove.

The invention described in claim 7 is the first invention.
And a part of a bracket fitted to the connector insertion portion has a concave portion or a convex portion, respectively.

[0024] The invention according to claim 8 has a plurality of leads comprising a plurality of external lead-out terminals and a plurality of terminals respectively connected thereto, and the terminal side of the leads is connected to a common connection portion. Forming a bracket by resin molding at a predetermined position of the hoop in which the external lead-out terminal portion of the lead is connected to the hoop body, and Cutting the common connection portion so that the plurality of terminal portions are not separated from the hoop main body, and simultaneously bending the plurality of terminal portions at predetermined positions of the bracket; and A plurality of terminal portions and a step of separating the plurality of external extraction terminal portions so as to be independent from each other, and inserting a connector into the connector insertion portion of the holder. When the plurality of electrode portions of the magnetoresistive element having the plurality of electrode portions previously attached to the magnetoresistive element mounting portion of the holder are electrically connected to the plurality of terminal portions of the connector. This has an effect that a plurality of terminal portions in the connector can be bent stably.

(Embodiment 1) Hereinafter, a magnetic sensor and a method of manufacturing the same according to Embodiment 1 of the present invention will be described.
This will be described with reference to the drawings.

FIG. 1A is a perspective view of a magnetic sensor according to Embodiment 1 of the present invention, and FIG. 1B is an exploded perspective view of the same.

Reference numeral 11 denotes a holder having a magnetoresistive element mounting portion 11a, a support base 11b, and a connector insertion portion 11c. A guide 11d for positioning and a connector insertion portion 1 are provided around the magnetoresistive element mounting portion 11a of the holder 11.
A locked portion 11e is formed in 1c. Reference numeral 12 denotes a magnetoresistive element mounted on the magnetoresistive element mounting portion 11a along a positioning guide 11d of the holder 11. The pattern 13a of the magnetoresistive element 12 and a plurality of electrodes 13b are formed on the magnetoresistive element 12, and the pattern 13a of the magnetoresistive element 12 and the electrodes 13b are electrically connected. Reference numeral 14 denotes a protective film, which coats the pattern 13a of the magnetoresistive element 12. 21
Is a connector, and a plurality of brackets 21a, a plurality of external lead-out terminal portions 21b, and a plurality of externally-connected lead-out terminal portions 21b are connected to each other through brackets 21a, 21b having a shape and size corresponding to the connector insertion portion 11c of the holder 11. Of the terminal portion 21c. The plurality of terminal portions 21c
Is a taper 2 previously formed on the bracket 21a.
A plurality of grooves 2 which are bent at an acute angle along 1d and a part of the plurality of bent terminal portions are formed in a taper 21d.
1e. Also, the bracket 21a has
A locking portion 21f that matches the locked portion 11e formed in the connector insertion portion 11c of the holder 11 and a stopper 21g that regulates the movement of the connector 21 when the connector 21 is inserted into the connector insertion portion of the holder are formed. . The connector 21 is inserted into the connector insertion portion 11c of the holder 11,
The plurality of electrodes 13b of the magnetoresistive element 12 and the plurality of terminals 21c of the connector are electrically connected.

A method of manufacturing the magnetic sensor according to the first embodiment of the present invention having the above-described configuration will be described below.

FIG. 2 is a process diagram of the magnetic sensor according to the first embodiment of the present invention, and FIG. 3 is a process diagram showing a procedure of processing a connector which is the main part.

First, as shown in FIG. 3 (a), a plate-like hoop material obtained by applying a solder plating to phosphor bronze includes a plurality of external lead-out terminal portions 21b, a plurality of terminal portions 21c, a common terminal portion 22, and the like. Punch into the specified shape.

Next, as shown in FIG. 3B, a taper 21d and a plurality of grooves 21
e, The bracket 21a on which the locking portions 21f and the like are formed is resin-molded.

Next, as shown in FIG. 3 (c), after the bracket 21a is formed, the common connecting portion 22 is AA so that the plurality of terminal portions 21c are not separated from the hoop body. Disconnect with

Next, as shown in FIG. 3D, the plurality of terminal portions 21c of the hoop having the common connection portion cut at AA are provided at predetermined positions of the bracket 21a and the bracket 21a and the plurality of terminal portions 21c. They are simultaneously bent along the taper 21d so that the angle between them becomes an acute angle. A part of the plurality of terminal portions 21c is mounted in the plurality of grooves 21e so that the bent plurality of terminal portions 21c do not move in the left-right direction. Next, as shown in FIG. 3E, the plurality of bent terminal portions 21c and the plurality of external lead-out terminal portions 21b are cut along BB so as to be independent and separated from each other, and then cut along CC. When cut, the connector 21 as shown in FIG. 3 (f) is completed. Here, if the cutting is performed first at BB, the plurality of terminal portions 21c are independent of each other, so that the bending depth tends to vary during the bending process. And then cutting at BB. Further, when cutting is performed at BB, the plurality of terminal portions 21c are independent from each other, so that the adjacent terminals are likely to be short-circuited.
Is attached to regulate the movement of the terminal.

On the other hand, after a plurality of electrode portions and a thin film layer made of a NiFe film or a NiCo film are deposited on a substrate made of glass or the like, and formed into a predetermined magnetoresistive element pattern by a photolithography or etching method. The magnetoresistive element 12 formed by depositing or printing a protective film is mounted on the magnetoresistive element mounting portion 11 along a positioning guide 11d of the holder 11 formed by resin molding.
a is attached via a UV resin or a thermosetting resin.

Next, the bracket of the connector is inserted into the connector insertion portion of the holder on which the magnetoresistive element is mounted. At this time, the insertion of the bracket is desirably performed until the bent shape of the plurality of terminal portions of the connector becomes about 90 degrees, and the stopper for restricting the insertion of the connector is located at such a position. By forming at the time of molding, the plurality of terminals are bent to about 90 degrees while being pressed against the plurality of electrodes of the magnetoresistive element. As a result, the plurality of terminals are formed by the plurality of electrodes of the magnetoresistive element. The parts are pressed against each other and are electrically connected. In order to prevent the connector bracket from coming off the holder, the bracket has a locking portion, and the locked portion in the connector insertion portion of the holder has a slope in the connector removal direction as compared to the slope in the connector insertion direction. Is formed at the time of molding with a large angle, so that the locking portion and the locked portion are prevented from being caught and removed. As described above, the holder and the connector are completely fixed and have an integrated structure.

Finally, for stable electrical connection, a plurality of terminals of the connector and a plurality of electrodes of the magnetoresistive element are soldered as necessary. In this embodiment, however, no external stress is applied. It can be easily soldered with a soldering iron, reflow, etc. Further, since the plurality of terminal portions are in contact with the plurality of electrode portions from the beginning, the plurality of terminal portions are not separated from the plurality of electrode portions due to thermal stress or the like.

(Embodiment 2) Hereinafter, a magnetic sensor according to Embodiment 2 of the present invention will be described with reference to the drawings.

FIG. 4A is a perspective view of a magnetic sensor according to Embodiment 2 of the present invention, and FIG. 4B is an exploded perspective view of the same.

The present embodiment is different from the first embodiment in that a convex portion 31 a and a locked portion 31 b are formed on the side surface of the holder 31, and the convex portion 31 a of the holder 31 is provided on the connector 41. The point is that the concave portion 41a and the engaging portion 41b of the matching shape and size are formed. With this configuration, if the concave portion 41a of the connector is inserted and fixed to the convex portion 31a of the holder to which the magnetoresistive element 32 is attached, the same configuration as in the first embodiment can be obtained. When the rotary encoder is installed at a low position according to the configuration of the present embodiment, the pattern of the magnetoresistive element facing the rotary encoder can also be arranged at a low position, which is an effective configuration.

Embodiment 3 Hereinafter, a magnetic sensor according to Embodiment 3 of the present invention will be described with reference to the drawings.

FIG. 5A is a perspective view of a magnetic sensor according to Embodiment 3 of the present invention, and FIG. 5B is an exploded perspective view of the same.

In the figure, reference numeral 51 denotes a holder, which is formed above and below the mounting portion of the holder 51 so that the support bases 51a and 51b are parallel to the pattern forming surface of the magnetoresistive element 52. With this configuration, the connector 61 is inserted into the connector insertion portion 51c of the holder to which the magnetoresistive element 52 is attached.
By inserting and fixing, the same effect as in the first and second embodiments can be obtained.

[0043]

As described above, according to the present invention, the plurality of electrodes of the magnetoresistive element and the plurality of terminals of the connector are electrically connected to the connector insertion portion of the holder in which the magnetoresistive element is mounted in advance. By inserting the connector as described above, it is possible to obtain sufficient contact between the plurality of electrode portions of the magnetoresistive element and the plurality of terminal portions of the connector without requiring much bending accuracy of the plurality of terminal portions of the connector. And a magnetic sensor which can be easily soldered without applying external stress, and a method of manufacturing the same.

Also, since the plurality of terminal portions and the plurality of electrode portions are in contact with each other from the beginning, it is possible to provide a magnetic sensor and a method of manufacturing the magnetic sensor, in which the plurality of terminal portions are not easily separated from the plurality of electrode portions due to thermal stress or the like. It is.

[Brief description of the drawings]

FIG. 1A is a perspective view of a magnetic sensor according to a first embodiment of the present invention. FIG.

[Fig. 2]

FIG. 3 is a view showing a processing procedure of a connector which is a main part of the same.

4A is a perspective view of a magnetic sensor according to a second embodiment of the present invention, and FIG.

FIG. 5A is a perspective view of a magnetic sensor according to a third embodiment of the present invention, and FIG.

FIG. 6A is a perspective view of a conventional magnetic sensor. FIG.

FIG. 7

FIG. 8 is a perspective view showing a usage example of a magnetic sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Holder 11a Magnetic resistance element mounting part 11b Support base part 11c Connector insertion part 11e Locked part 12 Magnetic resistance element 13b Electrode part 21 Connector 21a Bracket 21b External lead-out terminal part

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Masui ▲ Jo ▼ Shoji 1006 Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. In company

Claims (8)

[Claims] 1. A holder including a magnetoresistive element mounting portion, a connector insertion portion provided above or below the magnetoresistive element mounting portion, and a support base, and fitted to the connector insertion portion of the holder. A magnetic sensor comprising: a plurality of external lead-out terminals provided via a bracket to be provided; and a connector including a plurality of terminal parts electrically connected to the external lead-out terminals, respectively. When the connector is fitted to the connector, the electrode section of the magnetoresistive element having a plurality of electrodes previously attached to the magnetoresistive element attaching section of the holder is electrically connected to the plurality of terminals of the connector. Magnetic sensor. 2. A connector, in which a locking portion provided on a bracket of the connector is engaged within a connector insertion portion of the holder, and the locking portion and the locked portion are inclined surfaces with respect to the insertion direction of the connector. 2. The magnetic sensor according to claim 1, wherein the angle of the slope with respect to the direction in which the connector is removed is larger than that of the magnetic sensor. 3. The magnetic sensor according to claim 1, wherein the plurality of electrodes of the magnetoresistive element and the plurality of terminals of the connector are electrically connected at an acute angle between the bracket and the terminal of the connector. 4. The magnetic sensor according to claim 1, wherein the bracket of the connector is provided with a stopper that abuts on a surface of the holder having an opening of the connector insertion portion to restrict insertion of the bracket. 5. A taper is provided on a bracket of a connector,
The magnetic sensor according to claim 1, wherein a plurality of terminal portions in the connector are bent along the taper. 6. The magnetic sensor according to claim 1, wherein a plurality of grooves are provided in a bracket of the connector, and each of the plurality of terminal portions in the bent connector is mounted in the groove. 7. The magnetic sensor according to claim 1, wherein the connector insertion portion has a convex portion or a concave portion, and a part of a bracket fitted to the convex portion has a concave portion or a convex portion, respectively. And a plurality of leads each including a plurality of external lead-out terminal portions and a plurality of terminal portions respectively connected to the plurality of external lead-out terminal portions, wherein the terminal portion side of the leads is connected to the hoop main body by a common connection portion, and Forming a bracket by resin molding at a predetermined position of a hoop in which an external lead terminal portion of a lead is connected to the hoop body; and wherein the plurality of terminal portions are arranged on the hoop body with respect to a lead on a plurality of terminal portions of the hoop. A step of simultaneously bending the plurality of terminal portions at a predetermined location of the bracket after cutting the common connection portion so as not to be separated from the plurality of external connection portions; When inserting the connector into the connector insertion portion of the holder, the connector including a step of separating the extraction terminal portions so as to be independent from each other; A method for manufacturing a magnetic sensor, wherein the electrode portion of the magnetoresistive element having the plurality of electrode portions previously attached to an attachment portion and the plurality of terminal portions of the connector are electrically connected.