JP2000201446A - Motor and electric jointing of coil thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain slimness of an apparatus and little influence on surroundings or a human body by materializing thickness reduction and high reliability, in a motor used in an audiovisual unit or an information-related apparatus. SOLUTION: This electric jointing method includes a coil 1 and a printed circuit board 2, and the printed circuit board 2 includes a connection land 5 formed with a plated layer 29. The connection land 5 and the coil 1 are sandwiched by an upper electrode 42 for pressurizing, and the coil 1 is then energized for self heat generation and temperature rising, so that the plated layer 29 is melted for joining the coil 1 and the connection land 5. The plated layer 29 of the connection land 5 is formed by soldered plating, tinning, or silver plating not including flux.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor mainly used for audio / video equipment and information-related equipment, and more particularly to an electric joining technique of a coil thereof.

[0002]

2. Description of the Related Art The requirements and trends for the electrical connection of coils and the electrical connection of motor coils are as follows.

1: Reduction of dust at joints 2: Ensuring reliability of equipment and devices (outgassing) 3: Smaller and thinner motors and equipment using motors 4: Trend of lead-free (necessity) 5: CO ₂ ( Carbon dioxide) reduction trends

First, the necessity of reducing dust will be described. In recent years, a magnetic disk device particularly in the field of information equipment has a very narrow gap (0.1 μm) between a magnetic disk and a magnetic head.
If dust adheres to or collides with the magnetic disk, the operation during data writing and reading will be hindered.Motors equipped with a magnetic disk must be mounted with a magnetic disk to prevent dust from entering from outside. The entire motor is mounted in a sealed case to maintain the cleanliness of the magnetic disk area.

In recent years, there has been an increasing demand for smaller and thinner magnetic disk devices, lower power consumption, lower noise, and higher capacity in accordance with the trend of downsizing of computers used. The gap between the magnetic disk and the magnetic head during rotation of the clean magnetic disk area is currently about 0.1 μm. However, it is necessary to further reduce the gap in order to increase the density. Therefore, it is necessary to further increase the cleanliness of the apparatus, and there is a demand to reduce dust generated from the motor.

Secondly, the reliability of the device is ensured. In particular, outgas will be described. Adsorption due to outgas from motor members used in magnetic disk drives has become a problem, and the use of electrodeposition coating films with reduced organotin compounds in the electrodeposition coating used as insulating coatings for the stator core has begun to be used. I have.

When the size of the motor becomes smaller, the surface of a magnetic disk (hard disk) or a polygon mirror used in OA equipment has an unclear fogging despite the reduction of tin in the electrodeposition coating film. As a result, a phenomenon that causes a malfunction of writing or reading of data or a printing defect still occurs.

One of the causes is that even if a small amount of tin is contained in the electrodeposition coating of the stator core, as the device becomes smaller, the tin arsenic compound contained in the electrodeposition coating film is activated by chlorine, moisture, etc., and becomes gasified. It has been clarified that the cause is adsorption to the surface of a magnetic disk or the like.

Another problem is that a tin compound gas generated from tin contained in a lead-tin solder used for joining electronic parts and coils is adsorbed on the surface of a magnetic disk or the like. Is being done.

In particular, in the case of a motor for driving a magnetic disk and a motor for driving a polygon mirror, since the device is in a sealed state, even if a gas containing a trace amount of tin volatilizes, the magnetic disk or the polygon mirror may be fogged. all right.

Third, the trend of thinning and miniaturization will be described. The thickness of a magnetic disk device or the like is generally 25.4 mm for a 3.5-inch type, and 12.5 mm for a 2.5-inch type.
Due to the trend toward thin notebook computers from 7 mm in thickness, thinner ones such as 9.5 mm and 8.5 mm are being mounted.

Further, with the spread of the mounting ratio of CD-ROM devices to notebook personal computers, thin devices having a thickness of about 9.5 mm have been generally used. When the device becomes thinner, the height dimension of the motor is regulated by the device. As the device becomes thinner, it is necessary to reduce the overall height of the motor.

Fourth, the necessity of lead-free will be described. Recently, in the U.S., lead contained in solder from electrical appliances left unattended is eluted by acid rain, etc., and dissolves in groundwater. Has been published. Therefore,
Lead-free solder alloys that do not contain lead in solders have been highlighted in order to reduce the impact on the environment and the toxicity to the human body.

Fifth, the trend of CO ₂ (carbon dioxide) reduction will be described. Recently, it has been announced that CO ₂ (carbon dioxide) has an adverse effect on global warming. Therefore, reduction of CO ₂ (carbon dioxide) requires reduction of the amount of electricity, which is the main factor, and accordingly, improvement of energy efficiency of equipment used for production is desired.

In the above demands and trends, the conventional joining technique and joining method of the coil and the connection land of the printed circuit board generally include placing the coil on the connection land,
A method of joining with a bar solder and heat by a soldering iron has been often used. FIGS. 5A and 5B show an example of an electric joining technique of a coil and a connection land used for the coil.

FIG. 5A is an explanatory view showing a conventional joining method by soldering. In FIG. 5A, reference numeral 2 denotes a printed board, on which a printed pattern 3 is formed, and a resist 4 is formed on the printed pattern 3. Resist 4
The portions where no is formed are connection lands 5 for electrically connecting components, electronic components and the like.

In the conventional soldering, the coil 1 is connected to the connection land 5.
And lead-tin solder 6 made of tin
Thereafter, the bar solder 6 is melted by the heat of the soldering iron 7 and the coil 1 is joined to the connection land 5. The coil 1 is preliminarily soldered with solder made of lead-tin.
Since the soldering is generally performed in the air, the bar solder 6 contains a flux in order to prevent metal oxidation and reaction of the joint land during the soldering.

FIG. 5B is an explanatory view showing a state after soldering in a conventional example. In FIG. 5 (b), a lead solder (not shown) made of lead-tin contains flux in order to chemically remove an oxide film on the surface of the solder which melts and the metal to be soldered. After soldering, a large amount of flux residue 8 which is a cause of dust affecting the cleanliness of the apparatus remains around the electric joint 9 and the resist 4.

FIG. 6 is a sectional view showing the structure of a motor showing a conventional joining method. In FIG. 6, reference numeral 10 denotes a fixed shaft of the motor. Reference numeral 13 denotes a hub for mounting a magnetic disk (not shown), and reference numeral 15 denotes a cylindrical rotor magnet fixed to the hub 13. An upper bearing 11 and a lower bearing 12 are fixed to the inner diameter portion of the hub 13 so as to be separated from each other in the axial direction.

Reference numeral 14 denotes a bracket, on which the printed circuit board 2 is securely mounted on the surface of the bracket 14.
Thereafter, the stator core 16 provided at a position facing the rotor magnet 15 is fixed to the bracket 14.
Reference numeral 17 denotes a winding wound around the stator core 16. After that, the fixed shaft 10 is attached to a hole (not shown) at the center of the bracket 14, and the bracket 14 is fixed to a base (not shown) of the magnetic disk drive with a fixing screw (not shown).

Reference numeral 19 denotes a holder for holding the magnetic fluid seal 18, which is fixed on the upper bearing 11 on the inner diameter side of the hub 13. Then, the magnetic fluid seal 18 and the fixed shaft 1
A magnetic fluid 26 is magnetically held in a narrow gap with zero.

The magnetic fluid 26 is used for the upper bearing 1 composed of a ball bearing.
The purpose of the seal is to prevent oily dust generated from the bearing 1 and the lower bearing 12. The magnetic fluid 26 maintains the cleanliness of the area requiring cleanliness.

Reference numeral 20 denotes a protective plate, which is sealed with an adhesive 27 after being mounted on the holder 19. The joining of the coil 1 of the motor as described above is generally performed as shown in FIG.
The configuration is as shown in FIG. That is, the coil 1 is placed on the connection land 5 of the printed circuit board 2 and soldered with solder made of tin-lead. After soldering, the electrical joint 9 has a joint height h1 due to the variation in the amount of solder, the lifting of the coil 1 at the soldered portion during soldering, and the like.
And it has been difficult to make the motor thinner.

When joining is performed by the above-described method, the joint height h1 is about 1 mm, which occupies a large weight as compared with the above-described apparatus height of 9.5 mm, which makes it difficult to reduce the thickness of the motor.

FIG. 7 is a front view showing a printed circuit board constituting the motor. In FIG. 7, a printed pattern 3 made of copper is printed on a printed board 2.

The connection land 5 is provided on the printing pattern 3.
Are provided in about six places. These six connection lands 5 serve as electrode portions to which the coil 1 that is to start and end winding of a three-phase winding (not shown) is joined.

The printed board 2 is provided with a drawer portion 21. The drawer portion 21 extends outside the bracket 14 through a drawer hole 22 of the bracket 14 in FIG. After passing through the drawer section 21, the drawer hole 2
2 is a magnetic disk (not shown) sealed with a sealant 23
Maintain the cleanliness of the area in which is mounted.

FIGS. 8A and 8B are cross-sectional views of a motor formed by a conventional joining method. FIGS. 8A and 8B
Has a coil 1 and a printed circuit board 2 to which the coil 1 is soldered, as shown in
After mounting the coil 1 on the connection land 5 of the printed board 2, cream solder 24 is dropped on the electric joint 9, and then the electric joint 9 is heated with hot air 25 to transfer the coil 1 to the connection land 5 of the printed board 2. It is configured to be electrically joined.

In this way, only the intended place can be heated, and it takes a shorter time than warming the whole place. In this respect, it is described as being superior to the reflow soldering method and inexpensive in terms of equipment. ing.

However, since the cream solder 24 contains flux, flux residue (not shown)
Was left in the electrical junction 9, and cleaning was required in a subsequent step to remove the flux residue.

FIG. 9 is a sectional view of a joint portion of a motor according to another conventional joining method. FIG. 9 shows the actual registration
As shown in the publication, a hole 40 is formed in the connection land 5 of the printed board 2, and an L-shaped dedicated terminal 35 as a fixing member is inserted into the hole 40. The dedicated terminal 35 has a leg 36 inserted into the printed circuit board 2 and a holding piece 37 for holding the coil 1. Dedicated terminal 3 above
Reference numeral 5 denotes a barb 38 provided on the back side of the printed circuit board 2 to prevent the printed circuit board 2 from coming off, and temporarily fix the coil 1. Then, the coil 1 and the dedicated terminal 35 are integrally fixed to the connection land 35 by solder 39.

According to the above-described configuration, it is described that displacement, floating, separation, and the like of the coil 1 can be prevented, so that the soldering operation is facilitated and the working efficiency is improved.

However, the above-mentioned conventional example requires a special dedicated terminal for electrical connection, and also requires a special step of holding down the coil with a pressing piece of the dedicated terminal. In addition, the height of the motor and the device has been increased since the joint part uses a pressing part.

Further, as described in Japanese Utility Model Registration No. 301227/1990, after the coil is mounted on the connection land, the laser is irradiated to heat the soldered portion to remove the insulating film of the coil and to remove the coil connection land. And soldering at the same time.

The object described in this publication is that the removal of the insulating film and the soldering can be easily performed only by the laser irradiation, and the work can be more efficiently performed than the reflow soldering. However, the method described in this publication is expensive due to special equipment such as using a laser device such as a YAG laser.

Further, the removal and heating of the insulating film are performed using a laser device. However, since the energy conversion efficiency (2 to 3%) of the laser device is poor, a large amount of electric power is required to join the coils. Required and economically undesirable.

[0037]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the electrical joining of coils and the electrical joining of motor coils, namely: 1: Reduction of dust due to flux residue due to electrical joining of connection lands and coils. Requirement 2: Reduction of tin contained in components that affect device reliability 3: Requirement of thinning around joints due to slimming of motor 4: No adverse effect on environment and human body Demand for electrical products with joints. 5: To reduce and reduce CO ₂ (carbon dioxide) by reducing the amount of electric power to achieve and achieve global warming.

Also, by joining without using a flux, it is possible to meet internal requirements for improving productivity such as abolishment of cleaning equipment and reduction of steps.

In particular, in a motor for a magnetic disk drive, it is essential to completely remove the flux from the cleanliness required of the equipment. In addition, since the motor is provided with components such as ball bearings, the finished product cannot be washed, and therefore, addresses the problem of the flux removal method.

The joining by the dropping of the cream solder reduces the height of the joint portion, but the hot air as a heat source requires around 200 degrees, so that the temperature of the surrounding environment rises, or a facility for dropping the cream solder is required.

The present invention achieves high productivity without the need for a special device such as a laser device or the like, and the process that does not require the application of cream solder.

The above problems are also solved at the same time.
It is another object of the present invention to provide a motor that does not require special components such as a dedicated terminal or the like and that can be electrically connected without removing an insulating film of a coil before soldering.

By providing an excellent motor which is thin, compact and highly reliable, it is possible to respond to demands for thinning, downsizing, high reliability, and protection of the human body and the environment as well as global warming. The purpose is to prevent the conversion.

[0044]

In order to achieve the above object, the present invention comprises a coil and a printed board, a printed board having connection lands, and a plating layer formed on the connection lands.
The coil is placed on the connection land, the connection land and the coil are sandwiched between the upper electrodes and pressurized. Thereafter, the coil self-heats by heating and the temperature is raised, the plating layer is melted, and the coil and the connection land are separated. The coil of the winding of the motor and the printed circuit board are joined by the method of manufacturing the joined motor.

Further, the plating layer of the connection land is formed by solder plating, tin plating, silver plating or the like which does not contain flux. The coil is characterized in that it is bonded without having to remove an insulating film, a fusion layer or the like in advance.

[0046]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention comprises a coil and a printed board, a plating layer is formed on a connection land of the printed board, a coil is overlapped on the connection land, and a plating layer is formed on the connection land. This is an electrical joining method for joining a coil and a connection land by using a coil joining technique. As described above, since the connection lands are formed of the plating layer, the amount of plating is quantified, and thus the electric connection portion has an effect of keeping the height constant.

According to a second aspect of the present invention, a printed circuit board includes a connection pin to which a coil is joined, a plating layer is formed on a connection land of the printed board, and the connection pin is overlapped on the connection land to form a plating layer. This is an electrical joining method for joining a connection pin and a connection land with a layer, and expresses the present invention in terms of a coil joining technique. As described above, since the connection lands are formed of the plating layer, the amount of plating is quantified, and thus the electric connection portion has an effect of keeping the height constant. And since it is comprised by a connection pin, the position of a connection pin with respect to a connection land can be determined correctly.

According to a third aspect of the present invention, the connection pin to which the coil is joined is made of a copper-based metal or an aluminum-based metal, and the surface thereof is made of solder plating. This describes a specification suitable for maintaining the quality of the joint state with the coil.

Since the connection pins are made of a material having good conductivity, the coil has an effect of facilitating self-heating of the coil due to a current at the time of joining and raising only the temperature of the plating layer.

According to a fourth aspect of the present invention, the plating layer of the connection land is formed of a printed board made of any one of solder plating, tin plating, and silver plating.
It describes the specifications suitable for maintaining the quality of the joint. This facilitates melting of the coil due to self-heating and maintains the bonding quality.

The invention according to claim 5 of the present invention is such that solder plating, tin plating, silver plating, nickel plating, etc., do not contain flux, thereby having the effect of leaving no flux residue after joining.

According to a sixth aspect of the present invention, the cross-sectional area of the coil at the electrical joint after the electrical joining is at least 1
It has a flat shape at more than two places, thereby making it possible to further reduce the height of the bonding portion and to enable direct bonding with the connection land-like plating layer.

According to a seventh aspect of the present invention, a coil and a printed board are provided, a plated layer is formed on a connection land of the printed board, the coil is overlapped on the connection land, and the coil is connected to the coil by the plated layer. This is a motor in which a land is joined, and the present invention is expressed in the gist of a motor coil joining technique.

As described above, since the connection lands are formed of the plating layer, the amount of plating is quantified, so that the height of the electrical junction becomes constant, and the effect of reducing the variation is obtained.

[0055] The invention according to claim 8 of the present invention is provided with a connection pin to which a coil is joined and a printed board, a plating layer is formed on a connection land of the printed board, and the connection pin is overlapped on the connection land and plated. This is a motor in which connection pins and connection lands are joined by layers, and the present invention is expressed in the gist of a motor coil joining technique. As described above, since the connection lands are formed of the plating layers, the amount of plating is quantified, and thus the electric connection portion has an effect of keeping the height constant.
And since it is comprised by a connection pin, the position of a connection pin with respect to a connection land can be determined correctly.

According to a ninth aspect of the present invention, the connection pin to which the coil is joined is made of a copper alloy, and the surface is made of solder plating. It states the specifications suitable for maintaining the quality of the joint. Since the connection pins are made of a material having good conductivity, the self-heating of the coil due to the current at the time of joining is facilitated, and the function of raising the temperature of only the plating layer is provided.

According to a tenth aspect of the present invention, the plating layer of the connection land is made of a printed board made of any one of solder plating, tin plating, and silver plating. It describes the specifications that are appropriate to maintain. This facilitates melting of the coil due to self-heating and maintains the bonding quality.

According to an eleventh aspect of the present invention, the solder plating, the tin plating, the silver plating, etc. do not contain a flux, which describes a specification suitable for maintaining the quality of the joint. It is a thing.

According to a twelfth aspect of the present invention, the cross-sectional area of the coil of the electric connection after the electric connection of the motor has at least one flat shape, and
This makes it possible to further reduce the height of the joining portion, and also enables direct joining with the connection land-like plating layer.

According to a thirteenth aspect of the present invention, a coil and a printed board are provided, the printed board has connection lands, a plating layer is formed on the connection lands, and the coils are stacked on the connection lands. The coil is pressurized by the upper electrode, and then the coil is self-heated by heating and the temperature is raised. The coil is pressed to form a substantially flat shape, the plating layer is melted, and the coil is connected to the connection land. And a method for manufacturing a motor in which the present invention is joined, in which the present invention is expressed by a procedure for manufacturing an electric joint of the motor. Thereby, electric joining can be performed without requiring special parts for joining, and electric joining can be easily performed without requiring supply of cream solder or the like.

According to a fourteenth aspect of the present invention, there is provided a printed circuit board including a connection pin to which a coil is joined, a printed land having a connection land, a plating layer formed on the connection land, and a connection land. The connection pin is superimposed on the connection pin, and the connection pin is pressurized with the upper electrode. Thereafter, the coil self-heats by heating and the temperature is raised, the plating layer is melted, and the connection pin and the connection land are joined. This is a manufacturing method, in which the present invention is expressed by a manufacturing procedure of an electric joint of a motor. Thereby, electric joining can be performed without requiring special parts for joining, and electric joining can be easily performed without requiring supply of cream solder or the like.

According to a fifteenth aspect of the present invention, the plating layer of the connection land is formed of a printed board made of any one of a solder plating, a tin plating and a silver plating. It describes the specifications that are appropriate to maintain. Thereby, melting by self-heating can be facilitated and the joining quality can be maintained.

According to the invention of claim 16 of the present invention, solder plating, tin plating, silver plating, etc. do not contain flux, which describes a specification suitable for maintaining the quality of the joint. It is a thing.

According to a seventeenth aspect of the present invention, the connection pin to which the coil is joined is made of a copper alloy, and the surface is made of solder plating. It states the specifications suitable for maintaining the quality of the joint. This allows
Since the connection pins are made of a material having good conductivity, they have an effect of facilitating self-heating by current at the time of joining.

[0065]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1A is a sectional view of a printed circuit board according to an embodiment of the present invention, FIG. 1B is a sectional view of a bracket according to an embodiment of the present invention, and FIG. 1C is an embodiment of the present invention. It is sectional drawing of a stationary assembly.

1 (a), 1 (b) and 1 (c), a coil 1 which is a lead wire of a winding 17 wound around a stator core 16 has a winding start and an end wound from the winding 17. It is. The stator core 16 around which the winding 17 is wound is attached to the fixed shaft 10. At that time, coil 1
Is passed through the lead hole 49 of the fixed shaft 10. After the rotor magnet 15 is fixed to the inner diameter side of the hub 13, the bearing 50 a is firmly fixed to the hub 13.

After the bearing 50b is fixed to the inner diameter of the bush 51 in advance by a method such as bonding, the inner diameter of the bearing 50b is fixed to the fixed shaft 10. Then, the rotor magnet 1
The hub 13 having the bearing 5a and the bearing 50a inserts the bearing 50a into the fixed shaft 10 and inserts the inner diameter of the hub 13 into the bush 5
1 and fixed to the bearings 50a and 50b while applying a preload thereto. In this way, the stationary assembly 52 is completed with the hub 13 rotatable about the fixed shaft 10. Thereafter, the stationary assembly 52
And fixed to a predetermined height. After that, the printed board 2 is attached on the surface of the bracket 14.

FIG. 1D is a sectional view of a motor assembly according to the embodiment of the present invention. In FIG. 1D, reference numeral 53 denotes a motor assembly in which the bracket 14 and the printed board 2 are attached to the stationary assembly 52, and shows a state in which the coil 1 is not joined to the printed board 2.

The coil 1 is electrically connected to a printing pattern (not shown) of the printed board 2 fixed to the bracket 14 in order to supply a driving current from a driving circuit (not shown) provided outside the motor. Need to be

FIG. 2A is a view showing a state in which a coil is placed on a printed circuit board according to the embodiment of the present invention. FIG.
(B) is an enlarged sectional view of a joint part in an example of the present invention. In FIG. 2A, a printed pattern 3 is formed on a printed substrate 2 and is covered with a resist 4 thereon.

The portions where the resist 4 is not formed become connection lands 5 for electrically connecting components, electronic components and the like. The print pattern 3 is provided with an external connection land 55 for connecting to a drive circuit (not shown). A disposal land 54 is provided near the connection land 5. Then, the coil 1 that has gone out through the lead hole 49 of the fixed shaft (not shown) is placed on the connection land 5 provided on the printed pattern 3 of the printed board 2.

In FIG. 2B, a plating layer (not shown) of any one of solder plating, tin plating, and silver plating is formed on the surface of the connection land 5 in advance. These plating layers do not contain flux so that flux residue after soldering can be easily removed.

In FIG. 2B, the coil 1 is placed on the connection land 5 of the printed circuit board 2 placed on the bracket 14 and joined. Since the joint 1 height h2 of the coil 1 is suppressed to a height substantially equivalent to the diameter of the coil, the joint height h2 can be suppressed low.

The coil 1 is electrically connected to the connection land 5 by a plating layer (not shown) of solder plating, tin plating or silver plating formed on the connection land 5 in advance.

Therefore, since no flux remains in the soldering portion, dust such as flux generated from the motor can be reduced, and the reliability of the device can be improved. In particular, a greater effect can be obtained for a magnetic disk device that requires cleanliness.

Particularly, as shown in FIG. 2 (b), since the soldering state does not become a swelling shape as seen at the time of joining with the bar solder, the joint height h2 is substantially equivalent to the diameter of the coil 1, and the conventional technique is not used. It is possible to make the joint portion lower in height.

FIG. 2C is a structural sectional view of the motor according to the embodiment of the present invention. Therefore, as shown in FIG. 2C, the height of the joint portion of the coil 1 fixed to the printed board 2 fixed on the bracket 14 can be reduced.

The overall height of the motor can be reduced, and the equipment in which the motor is used can be reduced. The outer diameter of the coils used in these motors is φ0.05
０．５0.5 mm, which can be reduced to about 以下 or less as compared with the conventional soldering method.

In order to reduce the height h2 of the bonding portion, a suitable bonding state was obtained when the thickness of the plating layer was 10 μm to 100 μm. If the thickness of the plating is increased, the processing time of the plating process is required, which affects the productivity. Therefore, in the case of a bonding state within a practical range, 10 μm to 4 μm
A plating thickness of 0 μm is acceptable.

FIG. 3A is an explanatory view showing a method of electrical connection according to the present invention. In FIG. 3A, a plating layer 29 of any one of solder plating, tin plating, and silver plating is formed in advance on a connection land 5 forming a part of the print pattern 3 of the print substrate 2. Then, the coil 1 is placed at a position substantially at the center of the plating layer 29 on the connection land 5 provided on the print pattern 3 of the print substrate 2.

Thereafter, the power source a 28 is connected to the upper electrode 42. Also, a power supply b41 has one connected to the upper electrode 42,
The other is connected to the print pattern 3 by the lower electrode 45. The upper electrode 42 is connected to the coil 1 in a state where the coil 1 is pressurized by the pressing force F.

Here, the lower electrode 45 is connected to the print pattern 3, but may be directly connected to the connection land 5 or the plating layer 29 thereon. Although the printed board 2 in FIG. 3A is made of a single-sided copper foil board, it may be a double-sided copper foil board. In that case, the connection may be made to a pattern (not shown) or a land (not shown) on the back surface connected to the connection land 5 by a through hole (not shown).

Desirably, it is more efficient and practical to connect the lower electrode 45 to the plating layer 29 of the connection land 5 on which the coil 1 to be joined is mounted. However, if the area of the connection land 5 is small and there is no contact space for the lower electrode 45, as shown in FIG.
It is preferable that the plating layer is provided in advance, and the lower electrode 45 is connected to the plating layer of the waste land 54.

As described above, in particular, the upper electrode 42 and the lower electrode 45
It is not necessary to make the coil 1 narrow, and it is only necessary to connect at least one electrode to the coil. Therefore Figure 2
As shown in (c), the coil can be self-heated and joined in the last step when the assembly of the motor is almost completed.

FIGS. 3B and 3C are cross-sectional views of the electrically joined portion of the present embodiment. 3B and 3C, when a current flows from the power source a to the upper electrode 42, Joule heat is generated in the narrow portion 43 of the upper electrode 42, and the narrow portion 43 of the upper electrode 42 is heated. . The coil 1 is generally provided with an insulating film (not shown) of insulating polyurethane for maintaining insulation. When high insulation and heat resistance are required, an insulating film such as polyester or polyimide is used.

The insulating film of the coil 1 is moved from the power source a to the narrow portion 43.
The Joule heat of the current flowing through the film causes softening, and part of the insulating film is destroyed. Since the upper electrode 42 is pressed downward by the pressing force F, the upper electrode 42 and the coil 1 make metal contact. The current supplied from the power source a may be AC or DC.

Thereafter, a current is supplied from the power source b to the upper electrode 42, and then flows from the upper electrode 42 to the coil 1, then flows from the coil 1 to the plating layer 29, and flows from the plating layer 29 to the connection land 5. Flows from the connection land 5 to the lower electrode 45 connected to the print pattern 3. Even if the current flows in the opposite direction as described above from the lower electrode 45 to the upper electrode 42, the effect does not hinder.

When the lower electrode 45 is connected to the plating layer of a discard land (not shown), the power is supplied from the power source b toward the upper electrode 42, flows from the upper electrode 42 to the coil 1, and flows from the coil 1 to the upper electrode 42. The lower electrode 4 flows through the plating layer 29 via a waste land (not shown) connected to the plating layer 29.
Flow to 5. It should be noted that the direction in which the current flows is opposite to that described above, and the flow of the current from the lower electrode 45 toward the upper electrode 42 does not affect the effect.

The current flowing from the power source b self-heats due to the resistance of the flowing path. Then, heat generated from the inside of the coil 1 causes the insulating film (not shown) of the coil 1 to be vaporized and removed. Thereafter, the plating layer 29 located on the lower portion of the coil 1 is melted by the heat generated by the self-heating of the coil 1. Thereafter, the molten plating layer 29 is drawn into the gap space 46 between the coil 1 and the connection land.

When the power supply from the power source b is stopped and the upper electrode 42 is removed from the coil 1, the plating layer 29 is electrically joined by the hardened metal after melting. Since the plating layer is formed of a metal having a lower melting point than the copper alloy which is the material of the coil 1, the plating layer can be melted without melting the coil 1 itself. is there.

In particular, in this method, since the coil 1 is pressurized with the pressing force F, the coil 1
As shown in FIG. 3A, the cross section of the coil 1 is made up of the coil 1 and the upper electrode 42, and the coil 1 and the plating layer 29 as shown in FIG.
Contact point 47 or contact point 48, and contact point 47,
48 can be formed into a flat shape, and as a result, the joint height h2 can be further reduced.

According to such a method, it is not necessary to remove the insulating film of the coil by laser irradiation or a mechanical method in advance, and the insulating film can be removed and the electric bonding can be performed in the same step. A highly productive motor can be provided. In the above-described configuration, the method of energizing current and causing self-heating is based on energy conversion efficiency (30%).
(About 50%), which leads to a power reduction of about 1/10 compared to the joining using a laser device, and can greatly contribute to the prevention of global warming.

Of course, the bonding can be performed by removing the insulating film at the portion to be bonded or the fusion layer formed on the outer periphery thereof before the bonding by the above-described method. In particular, when the plating layer 29 is formed of any one of tin and silver plating, the motor having the joint becomes a lead-free motor containing no lead, and can prevent adverse effects on the environment and the human body. Furthermore, silver plating or the like does not generate a tin compound gas that affects the reliability of the device, so that it is possible to provide a motor that generates less gas that has a harmful effect on the device.

In particular, in the case of joining coils having an insulating film, they are joined in a shape as shown in FIG. That is, the plating layer 29 is guided and joined to the lower portion of the coil 1. Although approximately half the outer diameter of the coil 1 is covered with the plating layer 29 at the joining portion, the reliability is sufficient.

FIG. 3B shows that the coil 1 and the like are preliminarily subjected to a surface treatment such as solder plating or preliminary soldering.
As shown in (b), the joining that covers the entire outer periphery of the coil 1 can be performed. Even in this case, the height h2 of the joint portion can be substantially the same as that of the coil 1, and it is possible to provide a thin electric joint which can be kept lower than that, or a motor using the same.

As described above, since the coils are joined by pressurizing with the upper electrode 42, the joined coils are contact points 47 or 48, and contact points 47 and 47 shown in FIG. It is flattened by being pressed around 48. The flat shape can increase the direct contact area between the printing land 5 and the coil 1, thereby ensuring electrical connection. And contact point 47 or 4
By making the contact points 8, the contact points 47, and the contact points 48 flat, the joint height h2 can be further reduced.

FIG. 4A is a sectional view showing a winding assembly according to another embodiment of the present invention, and FIG. 4B is a sectional view showing a printed board assembly having a printed board according to another embodiment of the present invention. FIG. 4C is a sectional view showing a bracket assembly according to another embodiment of the present invention.

In FIG. 4 (a), reference numeral 33 denotes a winding assembly, the manufacturing process of which is described. The winding 17 is wound around the stator core 16 via an insulator 44 for insulation. The cylindrical portion 31 that is a part of the insulator 44 is inscribed in the hole 30 of the stator core 16. Then, a substantially L-shaped connection pin 32 is press-fitted into the inside located at the center of the inscribed cylindrical portion 31. The connection pins 32 may be bent into a substantially L-shape after press-fitting a straight pin.

The connection pins 32 are made of a conductive or elastic copper-based metal or aluminum-based metal.
The surface is plated with solder or the like.

The coil 1 at the end of winding or at the beginning of winding, which is a lead wire of the winding 17, is wound around the connection pin 32, and is electrically joined in advance by soldering or the like. The winding assembly 33 is assembled as described above.

In FIG. 4B, reference numeral 34 denotes a printed board assembly, and the printed board 2 is fixed to the bracket 14. A printed pattern 3 and a connection land (not shown) are provided on the printed board 2.
Is provided. A connection land provided on the print pattern 3 of the print substrate 2 has a plating layer (not shown) of any one of solder plating, tin plating, and silver plating.
Are formed in advance.

In FIG. 4C, a winding assembly 33 is attached to the printed board assembly 34. The connection pins 32 are arranged so as to correspond to connection lands (not shown) of the printed board 2 of the printed board assembly 34.

Since a plating layer (not shown) of any one of solder plating, tin plating and silver plating is formed on the connection land (not shown) in advance, the upper electrode (not shown) of the power supply (not shown) is formed. ) Is connected to the connection pin 32 and the other lower electrode (not shown) is connected to the print pattern 3, and then the power is supplied from a power source to melt the plating layer by self-heating, thereby connecting the connection land and the connection pin 32. Electrically join.

If the coil is wound around the connection pin in advance and soldering is performed as described above, the positioning between the connection pin of the winding assembly and the connection land of the printed circuit board assembly can be accurately performed, and the position of the joint can be improved. Misalignment can be eliminated. Then, the joining step can be automated and the productivity can be improved.

The electric joining technique of the present invention can be applied not only to motors but also to electric joining in other fields using similar coils.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various applications and developments are possible within the scope of the present invention.

[0108]

As is apparent from the above description, according to the present invention, it is possible to reduce the height of the joint at the electric joint of the motor coil and to reduce the generation of dust from the joint to reduce the reliability. It is possible to obtain highly product. Further, it is possible to provide a motor that generates less gas such as tin. Further, the use of lead, which is harmful to the environment and toxic to the human body, can be eliminated.

In addition, it is possible to abolish washing after bonding by a bonding method that does not require a flux, and it is possible to reduce steps and equipment investment. In addition, the connection can be performed without requiring a special device such as a laser device or a special component for fastening.

Thus, a small-sized and highly reliable motor can be provided, thereby making it possible to reduce the thickness of the device and reduce adverse effects on the global environment and the human body.

[Brief description of the drawings]

1A is a sectional view of a printed circuit board according to an embodiment of the present invention. FIG. 1B is a sectional view of a bracket according to an embodiment of the present invention. FIG. 1C is a sectional view of a stationary assembly according to an embodiment of the present invention. Sectional view of the motor assembly in the embodiment of FIG.

2A is a diagram showing a state in which a coil is placed on a printed circuit board according to an embodiment of the present invention. FIG. 2B is an enlarged cross-sectional view of a joint portion according to the embodiment of the present invention. Cross section of the structure

FIGS. 3A and 3B are explanatory views showing a method of electrical joining according to the present invention; FIG. 3B is a sectional view of an electrically joined portion of the present embodiment;

FIG. 4A is a cross-sectional view showing a winding assembly according to another embodiment of the present invention. FIG. 4B is a cross-sectional view showing a printed board assembly having a printed board according to another embodiment of the present invention. Sectional drawing which shows the bracket assembly in another Example.

FIG. 5 (a) is an explanatory view showing a joining method by soldering of a conventional example. (B) is an explanatory view showing a state after soldering of a conventional example.

FIG. 6 is a sectional view of a motor showing a conventional joining method.

FIG. 7 is a front view showing a printed circuit board constituting the motor.

8A is a cross-sectional view of a motor formed by a conventional joining method. FIG. 8B is a cross-sectional view of a motor formed by a conventional joining method.

FIG. 9 is a sectional view of a joint portion of a motor formed by another conventional joining method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil 2 Printed circuit board 5 Connection land 9 Electrical connection part 29 Plating layer 32 Connection pin 42 Upper electrode

Continued on the front page F term (reference) 5E319 AA03 AB01 AC17 CC11 GG20 5H604 AA05 BB01 BB15 BB17 CC01 CC05 CC16 QB01 QB04 5H615 AA01 BB01 BB07 BB14 BB16 BB17 PP01 PP14 PP15 QQ02 RR09 SS16 SS18 SS38 TT05 TT12

Claims (17)

[Claims] 1. A printed circuit board comprising: a coil; and a printed board, wherein a plating layer is formed on a connection land of the printed board, the coil is overlapped on the connection land, and the coil and the connection land are joined by the plating layer. Electrical joining method. 2. A printed circuit board comprising: a connection pin to which a coil is joined; and a printed board, a plating layer is formed on a connection land of the printed board, the connection pin is overlapped on the connection land, and the connection pin is An electric joining method for joining the connection land. 3. The electric joining method according to claim 2, wherein the connection pin to which the coil is joined is made of a copper-based metal or an aluminum-based metal, and the surface thereof is made of solder plating. 4. The method according to claim 1, wherein the plating layer of the connection land comprises a printed board formed of any one of solder plating, tin plating, and silver plating. 5. The method according to claim 4, wherein the solder plating, tin plating, silver plating, etc. do not contain flux. 6. The electric joining method according to claim 1, wherein the cross-sectional area of the coil of the electric joining portion after the electric joining has at least one flat shape. 7. A printed circuit board comprising: a coil; and a printed board, wherein a plating layer is formed on a connection land of the printed board, the coil is overlapped on the connection land, and the coil and the connection land are joined by the plating layer. Motor 8. A printed circuit board comprising: a connection pin to which a coil is joined; and a printed board, a plating layer is formed on a connection land of the printed board, the connection pin is overlapped on the connection land, and the connection pin is A motor formed by joining the connection lands. 9. The motor according to claim 8, wherein the connection pin to which the coil is joined is made of a copper-based metal or an aluminum-based metal, and the surface thereof is made of a solder plating. 10. The plating layer of the connection land is plated with solder,
9. The motor according to claim 7, comprising a printed board made of one of tin plating and silver plating. 11. The motor according to claim 10, wherein the solder plating, tin plating, silver plating and the like do not contain flux. 12. The motor according to claim 7, wherein the cross-sectional area of the coil of the electric connection after the electric connection has at least one flat shape. 13. A printed circuit board comprising: a coil; and a printed board, wherein the printed board has connection lands, a plating layer is formed on the connection lands, the coil is overlapped with the connection lands, and the coil is connected to an upper electrode. Then, the coil is self-heated by energization, and the temperature is increased.The coil is formed into a substantially flat shape by pressurization, and the plating layer is melted.
A method for manufacturing a motor, comprising joining the coil and the connection land. 14. A printed circuit board comprising: a connection pin to which a coil is joined; and a printed board, wherein the printed board has a connection land, a plating layer is formed on the connection land, and the connection pin is overlapped with the connection land. Pressing the connection pin with the upper electrode,
Thereafter, a method of manufacturing a motor, wherein the coil is self-heated by heating and the temperature is raised to melt the plating layer and join the connection pin and the connection land. 15. The plating layer of the connection land is solder-plated.
15. The method for manufacturing a motor according to claim 13, comprising a printed board formed of one of tin plating and silver plating. 16. The method for manufacturing a motor according to claim 15, wherein solder plating, tin plating, silver plating and the like do not contain flux. 17. The motor according to claim 14, wherein the connection pin to which the coil is joined is made of a copper-based metal or an aluminum-based metal, and the surface thereof is made of a solder plating.