JPH11299167A - Terminal construction for chip-type motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chip-type motor capable of maintaining a surely electrically connected state of its motor terminals to external fitting terminals 3, only by inserting the external fitting terminals into the motor terminals 2 from a lateral direction, without performing special soldering and so on. SOLUTION: This terminal construction is provided with a bracket 1 made from an insulating material, power-feeding motor terminals 2 protruded from the bracket 1, and external fitting terminals 3 to be connected electrically to the motor terminals 2. And each motor terminal 2 is arranged vertically long between both walls 11, 12 of a groove 10 formed in the bracket 1, and each external fitting terminal 3 has a slit 3a and tapering protrusions 3b capable of interposing a motor terminal 2 in between at its tip section, and is pressed in between both walls 11, 12 of the groove 10 in such a way as to interpose a motor terminal 2 between by the slit 3a. And the tapering protrusions 3b are pressed against the walls 11, 12, and the motor terminal 2 and an external fitting terminal 3 are stuck to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal structure of a chip type motor having a highly reliable external lead-out terminal in a simple process.

[0002]

2. Description of the Related Art As shown in FIG. 5, a conventional small motor is a power supply motor terminal 5 which is press-fitted and fixed to a bracket 51.
2 (the connection between the brush and the inside of the motor)
Was soldered and fixed.

At the time of mounting on a board or the like, a holder 61 is attached to the motor main body 60, and external terminals 53 are inserted into through holes 71 and 72 provided on a circuit board 70 for fixing and supplying the motor. , Foot 61a of holder 61
(Not shown, but at a plurality of locations) are inserted into the through holes 73 and soldered.

As another method, although not shown, there is also a method of directly soldering a lead wire to the motor terminal 2, which is the most common method often used for large motors and the like.

[0005]

However, in the conventional example shown in FIG. 5, it is necessary to insert the motor 10 into the through hole of the board 70 and to solder it from the back side of the board, which causes an increase in cost. Further, in the case of a small motor, the interval between the terminals 3 is narrow, and in the structure of FIG. 5, the workability of the solder is deteriorated, which is a cause of poor soldering.

[0006] Soldering with a lead wire by another method has a large workability, particularly in a small motor, and also causes a cost increase.

Further, in the conventional example shown in FIG. 5, when an impact such as dropping of the apparatus in a soldered state where the motor is mounted on the board is given, the holder 61 and the motor body 60 are relatively displaced by a large impact. There is. In such a case, although the holder 61 and the external terminal 53 are fixed to the substrate 70 by soldering, only the motor main body 60 is displaced, so that a large stress acts between the motor terminal 52 and the external terminal 53. ,
There is a problem that the soldered portion, the motor terminal 52, and the brush inside the motor connected to the soldered portion and the like are seriously damaged, and the motor characteristics are affected.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has, for example, the following arrangement as one means for solving the above-mentioned problems.

That is, the bracket 1 formed of an insulating material
A motor terminal 2 for power supply protruding from the bracket 1, and an external terminal 3 electrically connected to the motor terminal 2, wherein the motor terminal 2 has a groove formed in the bracket 1. The external terminal 3 has a slit 3a and a tapered convex portion 3b which can sandwich the motor terminal 2 at a tip end thereof. 12 between the slits 3a
By press-fitting the motor terminal 2 so as to sandwich it, the tapered convex portion 3b is pressed against the wall surfaces 11 and 12 so that the motor terminal 2 and the external terminal 3 are pressed and stable conduction is obtained. It is characterized by comprising.

[0010] For example, at least the periphery of the central portion of the motor is formed of a flat metal at the bottom at the time of mounting,
The distal end of the external terminal 3 is bent and formed so as to be substantially flush with the flat bottom surface of the metal of the motor to enable reflow soldering to a circuit board.

Also, for example, the wall surface 1 of the bracket 1
The undercut projection 41b is provided on at least one of the wall surfaces of the external terminals 1 and 12 so that the external terminal 3 does not escape in the motor axis direction.
Is provided.

Furthermore, a bracket 1 made of an insulating material
A motor terminal 2 electrically connected to the brush portion of the motor is disposed in the recessed portion of the motor so as to protrude by a predetermined amount, and an external terminal 3 for connecting the motor terminal 2 and a motor driving power source is horizontally disposed. A slit portion 3a and a tapered convex portion 3b capable of holding the motor terminal 2 are formed at the tip of the external terminal 3 so that the external terminal 3 can be inserted into the motor terminal 2 in the concave portion from the direction. The motor terminal 2 is inserted into the slit portion 3a and the inner wall surface 1a of the concave portion of the bracket 1 and the tapered convex portion 3 are formed.
b, and presses against the tapered convex portion 3b to apply an inner pressure to narrow the width of the slit portion 3a to connect the motor terminal 2 and the external terminal 3. [Operation] In the above-described configuration, the external connection of the external terminal 3 is securely performed only by inserting the external terminal 3 into the motor terminal 2 without performing special soldering or the like. State can be maintained. For this reason, productivity can be significantly improved.

Furthermore, when an impact is applied, the connecting portion between the motor terminal 2 and the external terminal 3 can shift,
This displacement can absorb an impact, and can reduce the application of an excessive force to the motor terminal 2.

Further, by providing the bracket 1 with the undercut convex portion 41b, the external terminal 3 can be prevented from coming off in the motor axial direction, and a stronger connection state can be maintained.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[First Embodiment] FIGS. 1 to 3 mainly show a terminal structure of a chip type motor according to an embodiment of the present invention. FIG. 1 shows this embodiment. FIG. 2 is a diagram showing a structure of a bracket portion of a chip-type motor body of an embodiment, FIG. 2 is a diagram showing a structure of an external terminal of the embodiment, and FIG. 3 is an external terminal of the chip-type motor of the embodiment. It is a figure showing the state where it attached.

First, the structure of the bracket portion of the chip type motor main body of this embodiment will be described with reference to FIG.
In FIG. 1, reference numeral 1 denotes a bracket according to the embodiment,
Denotes a motor body. In the chip type motor according to the present embodiment, the position indicated by the arrow A is on the substrate side during mounting.

The bracket 1 is made of an insulating material, and the substrate side of the bracket 1 is formed to be slightly thin except for the central portion 15, and the central portion of the thick portion on the opposite side is slightly rectangular at a predetermined distance. Are formed. A motor terminal 2 made of a conductive material that is electrically connected to a brush part (not shown) in the motor body 20 is provided at a substantially central part of the groove part 10. In the present embodiment,
The motor terminal 2 is formed of a metal plate.

In this embodiment, the motor terminal 2
Has a structure in which an external terminal formed of a conductive material for electrically connecting the motor terminal 2 and a wiring pattern (motor drive power supply pattern) on a mounting board is fixed. Reference numeral 15 plays a role of separating between external terminals locked to the respective motor terminals 2.

FIG. 2 shows the configuration of an external terminal inserted into the groove 10. As shown in FIG. In FIG. Reference numeral 3 denotes an external terminal used in the present embodiment. In this embodiment, the external terminal 3 is formed of a metal plate.

A tapered convex portion 3b is formed on both outer sides of the distal end of the external terminal 3, and a slit 3a capable of sandwiching the motor terminal 2 is formed at the center of the distal end.
The base portion has a reflow portion 3c which is bent so as to be substantially a mounting board surface when the external terminal 3 is locked to the motor terminal 2 of the motor body 20 shown in FIG.

FIG. 3 shows a state in which the external terminal 3 is mounted on the bracket 1. In the present embodiment, the motor terminal 2 is provided on both wall surfaces 11, 1, 1 of a groove formed in the bracket 1.
2, the external terminal 3 shown in FIG. 2 is attached to the motor 20 so that the motor terminal 2 is sandwiched between the slits 3a when the external terminal 3 is mounted on the motor 20.
Press-fit the tip of the external terminal 3 between the two.

As a result, the tapered projections 3 are formed on the wall surfaces 11 and 12.
b is pressed and pressure is applied in the direction in which the width of the slit 3a of the motor terminal 2 is reduced, so that the external terminal 3 is maintained in a state of being pressed against the motor terminal 2 and is stably fixed without special soldering or the like. The state is obtained.

Further, as shown in FIG.
A lid 12 is attached to a holder 16 for fixing the motor body 20 on a mounting board so that the motor body 20 does not move due to an impact or the like. Then, the external terminal 3 is press-fitted and inserted into the motor terminal 2, and the bottom surface 16b of the holder 16 and the reflow portion 3c of the external terminal 3 have the same height, or the reflow portion 3c of the external terminal 3 is slightly It is configured to float more.

In this embodiment, as shown in FIG. 3, the bottom surface 16b of the holder 16 and the top surface of the lid 17 are formed in a flat shape. This is to enable automatic mounting on a substrate by an automatic mounting machine. Because of this structure, cream solder is placed on the motor fixing pattern portion of the mounting board, and the flat surface of the upper surface of the lid 17 is sucked by the vacuum tweezers or the like of the automatic mounting machine to attract the motor of this embodiment, and Can be put in place.

In this state, if a reflow furnace is passed, the bottom surface 16
The part b is reflow-soldered, and the fixing on the substrate is completed. At the same time, the reflow portion 3c of the external terminal 3 can be connected at the same time.

In the present embodiment, the diameter of the chip type motor is about 6φ, and the cost is greatly reduced by fully automating these steps. That is, the diameter used for general large motors and models is 15 mm.
Or, unlike a motor that has more than that, soldering is very difficult with a small motor, and if the amount of solder is slightly wrong, soldering failure will occur. The small size makes manual positioning difficult and very inefficient, but automatic mounting by an automatic mounting machine is possible, which can significantly improve productivity.

The motor shown in FIG. 3 in the present embodiment is mounted on a control board in a radio telephone by attaching a weight having an eccentric center of gravity to a drive shaft, for example, and when the called signal arrives at the telephone, the motor is activated. Applications such as generating vibrations by rotating them are conceivable.

When a compact portable product such as a wireless telephone is mounted as described above, the machine may be accidentally dropped or hit against the surroundings, causing an unexpected impact. According to the above configuration of the present embodiment, the influence of the impact can be minimized even in such a case.

The chip type motor of this embodiment is shown in FIG.
As shown in (1), the motor terminal 2 and the external terminal 3 are not directly soldered, but in a state in which the external terminal 3 is pressed into the motor terminal 2. For this reason, the holder 16 and the lid 17, which are fixed to the substrate by reflow soldering, are protected against the impact so that the motor does not float.
Even if the motor body is displaced, the motor terminal 2 and the external terminal 3 are only connected by press-fitting, and the connection part can be displaced when an impact is applied, and the impact is absorbed by this displacement. As a result, the application of excessive force to the motor terminal 2 can be reduced. Therefore, the reflow solder portion 3c,
No large force is applied to the motor terminal 16b or the motor terminal 2.

As described above, according to the present embodiment, the external terminal 3 is securely inserted into the motor terminal 2 only by inserting the external terminal 3 from the lateral direction without special soldering or the like. The state of being electrically connected to the attached terminal 3 can be maintained. For this reason, productivity can be significantly improved.

Further, when an impact is applied, the connecting portion between the motor terminal 2 and the external terminal 3 can shift,
This displacement can absorb an impact, and can reduce the application of an excessive force to the motor terminal 2.

[Second Embodiment] In the above description, the attachment of the external terminal 3 to the motor 20
a, the distal end of the external terminal 3 is press-fitted between the two wall surfaces 11 and 12 of the groove portion 10 so that the motor terminal 2 is sandwiched between the tapered convex portions 3b. The state of being pressed against the motor terminal 2 was maintained, and a stable fixed state was obtained.

However, the present invention is not limited to the above example, and furthermore, a second embodiment of the present invention according to the present invention, in which the fixed state between the external terminal 3 and the motor terminal 2 is completed. An embodiment will be described in detail.

FIG. 4 is a view showing a state in which the external terminal 3 is mounted on the bracket 1 according to the second embodiment of the present invention. In FIG. 4, the same components as those of the first embodiment shown in FIG. 3 described above are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the embodiment of the second invention, the structure of both wall surfaces of the groove is different. In FIG.
Are the grooves of the second embodiment, and the undercut projections 4 are formed in the upper openings of both wall surfaces of the groove 40 of the bracket 1.
1b is provided.

The position of the protrusions 41b on both wall surfaces is at least as much as the thickness of the external terminal 3 above, and the external terminal 3 enters under the protrusion 41b, and the external terminal 3 is connected to the motor. The structure is such that it does not come off toward the upper side of the terminal 2.

As described above, according to the second embodiment, in addition to the functions and effects of the first embodiment, the external terminal 3 is provided on the wall surface of the groove 40 of the bracket 1 in the axial direction of the motor. By providing the undercut convex portion 41b so that the external terminal 3 does not enter the lower side of the convex portion 41b so that the external terminal 3 does not come off in the axial direction of the motor, a stronger connection is provided. We can maintain state.

[0039]

As described above, according to the present invention, the external terminal 3 can be securely inserted into the motor terminal 2 by inserting the external terminal 3 into the motor terminal 2 without any special soldering. The state where the terminal 3 is electrically connected can be maintained. For this reason, productivity can be significantly improved.

Further, when an impact is applied, the connecting portion between the motor terminal 2 and the external terminal 3 can be shifted.
This displacement can absorb an impact, and can reduce the application of an excessive force to the motor terminal 2.

Further, by providing the bracket 1 with the undercut projection 41b, the external terminal 3 can be prevented from coming off in the motor axial direction, and a stronger connection state can be maintained.

[0042]

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a bracket portion of a motor body in an embodiment of the present invention according to the present invention.

FIG. 2 is a diagram showing a structure of an external terminal of the motor according to the embodiment.

FIG. 3 is a diagram showing a state in which an external terminal is mounted on the motor according to the embodiment.

FIG. 4 is a view showing a state in which external terminals are mounted on a motor according to a second embodiment of the present invention.

FIG. 5 is a diagram showing a state in which a conventional motor is mounted on a board.

[Explanation of symbols]

 1, 51 bracket 2, 52 motor terminal 3, 53 external terminal 3a slit 3b taper convex part 3c reflow part 10, 40 groove part 11, 12 wall surface of groove part 15 central part 16, 61 holder 16b bottom surface of holder 17 lid 20, 60 Motor body 41b Convex portion 61a Holder foot 70 Circuit board 71, 72, 73 Through hole

Claims (4)

[Claims] 1. A bracket 1 made of an insulating material, and a power supply motor terminal 2 protruding from the bracket 1.
And an external terminal 3 that is electrically connected to the motor terminal 2. The motor terminal 2 is vertically disposed between both wall surfaces 11 and 12 of a groove formed in the bracket 1. The external terminal 3 has a slit 3a and a tapered convex portion 3b at its tip end capable of sandwiching the motor terminal 2, and the motor terminal 2 is sandwiched between the two wall surfaces 11, 12 of the groove by the slit 3a. Characterized in that the tapered projections 3b are pressed against the wall surfaces 11 and 12 by press-fitting, so that the motor terminals 2 and the external terminals 3 are pressed against each other to obtain stable conduction. Type terminal structure of motor. 2. At least the periphery of a central portion of the motor is
The bottom portion at the time of mounting is formed of a flat metal, and the tip of the external terminal 3 is bent and formed so as to be substantially flush with the flat bottom surface of the metal of the motor, and reflow soldering to the circuit board is performed. The terminal structure of a chip-type motor according to claim 1, wherein the terminal structure is enabled. 3. An undercut projection 41b is provided on at least one of the wall surfaces of the bracket 1 so that the external terminal 3 does not escape in the motor axis direction. A terminal structure of the chip type motor according to any one of the above. 4. A motor terminal 2 electrically connected to a brush portion of a motor is provided in a concave portion of a bracket 1 formed of an insulating material so as to protrude by a predetermined amount. A motor terminal 2 is connected to the distal end of the external terminal 3 so that the external terminal 3 for connecting to a power supply can be connected to the motor terminal 2 in the recess from the lateral direction.
Forming a slit portion 3a and a tapered convex portion 3b capable of holding the motor terminal 2 in the slit portion 3a of the external terminal 3.
And presses the inner wall surface 1a of the concave portion of the bracket 1 against the tapered convex portion 3b to apply an inner pressure to the tapered convex portion 3b, thereby narrowing the width of the slit portion 3a to reduce the width of the motor terminal 2 and the external terminal 3. A terminal structure of a chip-type motor, wherein connection is made.