JP5112225B2 - Miniature fan motor for surface mounting - Google Patents

Description

  The present invention relates to a substrate surface mounting of a fan motor having a shape and structure that can be mechanically and electrically surface mounted.

FIG. 8 shows the mounting of a general fan motor to the board.
The fan motor 35 has a mounting hole 37 and an electric signal cable 31 in a case 38. When the fan motor 35 is directly attached to the substrate (PCB) 33, the screw 30 is inserted into the attachment hole 37 of the case 38 and fixed with the nut 34. Or insert a rivet and fix it with a snap hook. The electric signal cable 31 is connected to an electric terminal of the substrate 33 by a connector 32.

Further, Patent Document 1 (small fan unit and brushless small DC motor) shows another example of a motor board mounting structure. In this example, a fan is mechanically attached to a substrate, and then the fan pins are soldered to the substrate. This is not surface mounting, but a structure in which pins attached to the fan motor are inserted into holes in the board and soldered from the opposite side of the fan motor.
Japanese Patent No. 4104747

  By the way, in a small device such as a cellular phone, in order to advance automation of component mounting, surface mounting components including mechanical components are required. However, the conventional mounting structure of the motor on the substrate cannot cope with surface mounting.

  An object of the present invention is to provide a surface mount ultra-small fan motor (hereinafter referred to as a “miniature fan motor”) that can be automatically mounted on the upper surface of a substrate by forming wiring patterns on the case surface and the inner surface in order to satisfy the functions both mechanically and electrically. "Surface mount fan motor").

In order to achieve the above-mentioned object, the invention according to claim 1 of the present invention has a fan motor section and a fan motor housing section with a case penetrating shape, and the fan motor is mounted on a case base portion supported by a stay from the outer periphery of the case. A case is provided with a wiring pattern for attaching electronic components to the case base and the stay, the wiring pattern is extended from the stay to the inner wall of the fan motor housing portion, and the extended wiring pattern is connected to the bottom surface of the case. It is characterized by being pulled out to the side of the case via
The invention according to claim 2 of the present invention is that, in the invention according to claim 1, the wiring pattern is led to each of the four side surfaces of the case, and the tip portion is used as a terminal for electrically connecting to the surface mounting substrate. Features.
The invention described in claim 3 of the present invention is characterized in that in the invention described in claim 2, there are two or more wiring patterns led to each of the four side surfaces.
According to a fourth aspect of the present invention, in the first, second, or third aspect, the case is rectangular, and the fan motor housing portion is a cylindrical space.
The invention according to claim 5 of the present invention has a fan motor portion and a fan motor housing portion, and has an opening for exhausting air on one of the side surfaces and the case base at the bottom of the fan motor housing portion. A case having a fan motor portion attached thereto, forming a wiring pattern for attaching an electronic component to the case base, providing a hole in the case base, and providing the wiring pattern on the back side of the case base via the hole; The extended wiring pattern is drawn out to the side of the case.
The invention according to claim 6 of the present invention is that, in the invention according to claim 5, a wiring pattern is led to each of the three side surfaces of the case, and the tip portion thereof is used as a terminal to be electrically connected to the surface mounting substrate. Features.
The invention described in claim 7 of the present invention is characterized in that in the invention described in claim 6, there are two or more wiring patterns led to each of the three side surfaces.
According to an eighth aspect of the present invention, in the first to seventh aspects of the present invention, a positioning guide is provided on the lower surface of the case and a guide fitting hole is provided on a surface mounting board. The fan motor is positioned by fitting a guide into the guide fitting hole.
According to a ninth aspect of the present invention, in the first to eighth aspects of the present invention, the wiring pattern formed on the case is formed by a MID technique.
According to a tenth aspect of the present invention, in the first to ninth aspects, the case is made of polyphthalamide, a liquid crystal polymer, or ceramics.

  According to the above configuration, the fan motor that has been conventionally considered as a mechanical component and could not be surface-mounted has become a component that can be surface-mounted. This has made it possible to automate the mounting of the fan motor on the surface mounting board. For example, it is possible to automate the mounting of a surface mount fan motor having a thickness in the range of 8 to 12 mm and a thickness in the range of 1.8 to 2.5 mm on the surface mounting substrate of the mobile phone, thereby reducing the manufacturing cost of the mobile phone. Can be realized.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view showing an embodiment of a surface mount fan motor according to the present invention, where (a) is a plan view, (b) is a left side view, (c) is a right side view, and (d) is a front view. And (e) are bottom views. 2A is a cross-sectional view taken along the line AA of FIG. 1, FIG. 2B is a diagram showing an example of a wiring pattern and a wiring pattern pattern formed on the stay and the case base, and FIG. 2C is an electronic component mounted on the wiring pattern pattern. It is a figure which shows the example which has arrange | positioned the coil to the upper part.
This example is an axial fan motor having a surface mounting wiring pattern terminal, and the wiring pattern terminal has two functions of electrical connection and mechanical fixing.

A plurality of fans 5 are implanted around the rotor hub 4 fixed to the shaft 15. This fan motor part is accommodated in the fan motor accommodating part 3 a of the rectangular case 3.
Three stays 6a, 6b, 6c are formed on the case bottom surface 3c, and a case base 17 is integrally formed at the center while being supported by the three stays 6a, 6b, 6c. A bearing housing (see FIG. 4) is fixed to the case base portion 17, and a bearing is fixed in the bearing housing. A shaft 15 of the fan motor unit is rotatably attached to the bearing.

  The wiring pattern and the wiring pattern are formed on the back surfaces of the stays 6b and 6c and the case base 17 as shown in FIG. 2B. Two wiring patterns 9 are formed in each of the stays 6b and 6c. A wiring pattern pattern 2 and lands 13a, 13b, and 13c for mounting electronic components are formed on the case base portion 17. The wiring pattern pattern 2 is connected to the wiring patterns of the stays 6b and 6c.

The electronic components 10a and 10b are connected to the wiring pattern 2 by soldering.
The two wiring patterns 9 formed on the stays 6b and 6c are connected to the wiring patterns 9a and 9b formed on the case inner wall 3b as shown in FIG. 2A. Furthermore, the wiring patterns 9a and 9b are connected to the wiring patterns 9c and 9d formed on the case bottom surface 3c. Furthermore, the wiring patterns 9c and 9d are connected to wiring pattern terminals 9e and 9f formed on the case side surface 3d. The wiring pattern terminals 9e and 9f are parts to be soldered to the surface mounting board.

  By such wiring, the surface mount fan motor 1 is electrically connected to the pattern 20a of the surface mount substrate 20 by the solder 21 and mechanically fixed as shown in FIG. For example, if one of the patterns 20a is positive for the fan motor power supply and the other of the patterns 20a is GND, it is possible to electrically connect to the surface mounting board 20 by omitting a lead wire that has been conventionally required. It becomes. Reference numeral 20b denotes an air circulation opening.

FIG. 4 is a partially broken cross-sectional view showing details inside the case.
The rotor hub 4 is fixed to the shaft 15, and the fan 5 is implanted around the rotor hub 4. A yoke 7 and a magnet 8 are disposed on the lower surface of the rotor hub 4. The bearing 12 is inserted and fixed to the bearing housing 14, and a shaft 15 is rotatably inserted into the bearing 12. The coil 11 is disposed outside the bearing housing 14. The lower side of the coil 11 is a case base 17, and a wiring pattern pattern or land is formed on the surface of the case base 17, and a wiring pattern 9 is formed on the surface of the stay 6 c. A yoke 16 is arranged alongside the case base 17.
A method of forming a three-dimensional circuit on the surface of an injection molded product, that is, a case base part, a stay, a fan motor housing part, a wiring pattern pattern formed on a case bottom surface and a case side surface, a wiring pattern and a wiring pattern terminal Made using. This MID does not require a separate circuit board and has the advantage that a wiring pattern can be formed directly on the case at the same time as the case is formed.

FIG. 5 is a plan view showing another embodiment of the present invention.
The embodiment of FIG. 1 shows an example in which wiring pattern terminals are provided on two side surfaces. In this example, wiring pattern terminals are provided on four side surfaces.
Since there are two wiring pattern terminals 25a, 25b, 25c and 25d each, eight electrical signals can be connected by synthesis.
As shown in FIG. 5, by increasing the number of wiring pattern terminals, fan rotation signals, acceleration, humidity, temperature sensor output monitoring, etc., and PWM control signals can be input.
However, for acceleration, humidity, and temperature, it is necessary to provide a fan circuit board and incorporate a sensor in it.

FIG. 6 is a side view showing still another embodiment in which a positioning guide is attached to the fan motor 1.
A positioning guide 23 is provided on the lower surface of the case 3. The surface mounting substrate 20 is provided with a guide fitting hole 20c in addition to the air circulation opening 20b.
When the fan motor 1 is mounted on the surface mounting board 20, the positioning motor 23 is engaged with the guide fitting hole 20c to position the fan motor. The wiring pattern terminal is connected to the pattern 20a by soldering or the like.

FIG. 7 is a partially broken perspective view showing still another embodiment applied to a centrifugal fan motor as a surface mount fan motor.
The case 24 has a rectangular shape, and one side surface of the case 24 is an opening 24a. A lid 25 having an air inlet 25a is placed on the case 24. The fan motor unit 26 is attached to the case base 24 b of the fan motor housing unit 27. Air sucked from the air inlet 25a is discharged from the side opening 24a.

A wiring pattern pattern (not shown) is formed on the surface of the case base 24b, and an electronic component (not shown) is mounted on this portion. The wiring pattern 28a is connected to this wiring pattern pattern, and further connected to the wiring pattern 28b formed on the inner wall of the case. A hole 24c is provided in the case base, and the wiring pattern 28b is connected to the wiring pattern terminal 28c on the side surface of the case via the hole 24c.
In this way, the configuration in which the wiring pattern formed on the case base 24b is connected to the wiring pattern terminal on the side surface of the case via the case inner wall and the hole is the same as the other side surface of the same case side surface and the opposite case side surface. A total of four wiring pattern terminals are formed on the side surfaces of the case that are provided at two locations on the side.

Although FIG. 7 shows an example in which the wiring patterns are drawn out to the side surfaces facing each other, it is possible to adopt a configuration in which two wiring patterns are drawn out from the side surfaces of the three cases, for a total of six wiring patterns.
The wiring pattern pattern, wiring pattern, and wiring pattern terminal of this embodiment can also be formed using MID.

The surface dimensions of the surface mount fan motor according to the present invention are, for example, 10 mm in length and width and 2.2 mm in thickness. As the resin material of the case, polyphthalamide (PPA), liquid crystal polymer (LCP), ceramics (alumina), or the like is used. The material of the wiring pattern is, for example, copper, nickel, gold, solder plating, or a combination thereof.
Although an example in which two positioning guides are provided in the above embodiment has been described, three or four positioning guides may be provided. Furthermore, the wiring pattern terminals provided on the side surfaces may be provided on three side surfaces, and one wiring pattern terminal may be provided on each side surface.

  This is a fan motor for mounting on a substrate surface used in small devices such as mobile phones.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows embodiment of the surface mount fan motor by this invention, (a) is a top view, (b) is a left view, (c) is a right view, (d) is a front view, (e) Is a bottom view. It is AA sectional drawing of FIG. It is a figure which shows the example of the wiring pattern formed in the stay and case base, and a wiring pattern pattern. It is a figure which shows the example which mounted the electronic component in the wiring pattern pattern, and has arrange | positioned the coil to the upper part. It is a figure which shows the state which mounted the fan motor on the surface mounting board | substrate. It is a figure for demonstrating the structure in a case. It is a top view which shows other embodiment of this invention. It is a figure which shows the example which provided the positioning guide in the fan motor. It is a partially broken perspective view which shows other embodiment applied to the centrifugal fan motor as a surface mount fan motor. It is a figure for demonstrating the mounting structure of the conventional fan motor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Surface mount fan motor 2 Wiring pattern pattern 3,24 Case 4 Rotor hub 5 Fan 6 Stay 7, 16 Yoke 8 Magnet 9 Wiring pattern (formed in stay)
9a, 9b Wiring pattern (formed on the inner wall of the case)
9c, 9d wiring pattern (formed on the bottom of the case)
9e, 9f Wiring pattern terminal (formed on the side of the case)
10a, 10b Electronic components (driving IC, resistors, etc.)
DESCRIPTION OF SYMBOLS 11 Coil 12 Bearing 14 Bearing housing 15 Shaft 17 Case base 18 Centrifugal fan 20 Surface mounting board 21 Solder

Claims (10)

A fan motor section;
The case has a case through-shaped fan motor housing portion, and includes a case in which the fan motor portion is attached to a case base supported by a stay from the outer periphery of the case
A wiring pattern for attaching electronic parts to the case base and the stay is formed, the wiring pattern is extended from the stay to the inner wall of the fan motor housing, and the extended wiring pattern is pulled out to the side of the case via the case lower surface. A super small fan motor for surface mounting.   2. The surface mount ultra-small fan motor according to claim 1, wherein a wiring pattern is led to each of the four side surfaces of the case, and a tip thereof is used as a terminal to be electrically connected to the surface mount substrate.   The surface mount micro fan motor according to claim 2, wherein there are two or more wiring patterns led to each of the four side surfaces. The case is rectangular,
4. The surface mount ultra-small fan motor according to claim 1, wherein the fan motor housing portion is a cylindrical space. A fan motor section;
It has a fan motor housing part, and includes a case in which an opening for discharging air is provided on one of the side surfaces and the fan motor part is attached to the case base of the bottom of the fan motor housing part,
Forming a wiring pattern for attaching an electronic component to the case base, providing a hole in the case base, extending the wiring pattern to the back side of the case base via the hole, and extending the extended wiring pattern to the case side surface Ultra-small fan motor for surface mounting, characterized by being pulled out to   6. The surface mount micro fan motor according to claim 5, wherein a wiring pattern is led to each of the three side surfaces of the case, and a tip thereof is used as a terminal to be electrically connected to the surface mount substrate.   The surface mount micro fan motor according to claim 6, wherein there are two or more wiring patterns led to each of the three side surfaces. A positioning guide is provided on the lower surface of the case and a guide fitting hole is provided on the surface mounting substrate.
8. The surface mount ultra-small fan motor according to claim 1, wherein when mounting the fan motor, the positioning motor is positioned by fitting the positioning guide into the guide fitting hole.   9. The surface mount ultra-small fan motor according to claim 1, wherein the wiring pattern formed on the case is formed by a MID technique.   The surface mount ultra-small fan motor according to claim 1, wherein the case is made of polyphthalamide, liquid crystal polymer, or ceramics.

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