JPH09247901A - Motors and equipment incorporating motors - Google Patents

Abstract

(57) An object of the present invention is to improve the mounting accuracy of a stator portion of a motor and the PCB 1, thereby improving the rotational accuracy of the motor. SOLUTION: This motor has a stator core 7 whose side edges are hexagonal and whose top has a hole 7a for screwing.
In order to fix the stator core 7 at a predetermined height, a PCB 1 provided with a first cut-and-raised portion 3 obtained by cutting and raising a part of a metal substrate.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a motor and a motor-assembled device.

[0002]

2. Description of the Related Art Conventionally, as a motor built-in device, for example, a laser beam printer, a disk drive device and the like have been proposed. In recent years, however, it has been desired to further improve the performance of these devices as the housing becomes smaller.

Now, a conventional motor will be described with reference to FIG.

As shown in the figure, the conventional motor has a rotor portion (negnet 55, yoke 56, shaft 57).
And the stator portion (coil 58, stator core 59, housing 60) and circuit board (printed circuit board:
The housing 60 of the stator portion is fixed to the PCB 61.

The housing 60 and the fixing plate 63 are fixed to each other by caulking or integral molding by caulking. The positioning of the stator core 59 and the PCB 61 is performed by the spacer 62 and the claw 62a of the spacer 62. Here, the claw 62a is fitted in the square hole of the PCB 61 to perform positioning for preventing rotation. Also PCB
61 and the fixing plate 63 are provided with a screw 65 via a spacer 64.
It is tightened and fixed.

[0006] As a device using this type of motor,
Although there are laser beam printers and the like, in recent years, the technology tends to move toward miniaturization, higher image quality, and higher speed.

Generally, laser beam printers and the like have
A motor (scanner motor) equipped with a polygon mirror for scanning a laser beam is incorporated in a deflection scanning unit (scanner) therein. This scanner motor needs to accurately scan a laser beam with a polygon mirror, which requires high rotation accuracy.

However, in the conventional motor, the housing 60, which is the stator portion of the motor, is positioned and fixed to the PCB 61 via the claws 62a and the spacers 62 and 64. Is bad, and the mounting accuracy is adversely affected by the rotation accuracy.

That is, when the mounting accuracy of the PCB 61 and the stator core 59 (coil 58) is poor, the waveform detected by the Hall element is deteriorated and the response of the driver IC and the like is deteriorated.

Therefore, such a motor cannot be used further as a scanner motor of a laser beam printer by making it smaller.

[0011]

As described above, in the conventional motor, since the stator portion is mounted on the circuit board via the claws and the spacers, the mounting accuracy is poor, and the rotation accuracy cannot be improved due to this influence. There was a problem that it could not be used for small scanner motors. The present invention has been made to solve such a problem, and provides a motor and a motor-assembled device capable of improving the mounting accuracy of a stator portion and a circuit board and thereby improving various performances. It is an object.

[0012]

In order to achieve the above-mentioned object, a motor according to a first aspect of the present invention comprises a stator core provided with a stator coil, and a substrate itself for fixing the stator core at a predetermined height. And a circuit board having a start-up portion in which a part of the above is raised.

In this case, a part of the substrate itself is raised to provide a rising portion, and the stator core is fixed at a predetermined height by this rising portion, so that a spacer or the like is not necessary, and the stator portion and the circuit are not required. The mounting accuracy with the substrate is improved.

According to a second aspect of the present invention, there is provided a motor according to the first aspect.
In the motor described above, the circuit board is a metal board in which a metal is used as a base material and a wiring pattern is formed on the base material via an insulating layer. The metal used as the base material is preferably one having good heat conductivity and workability such as aluminum and iron.

In this case, by using a metal substrate for the circuit board, it is possible to process the rising portion by raising it, a spacer or the like is not necessary, and heat dissipation can be improved.

A motor according to a third aspect of the present invention is the motor according to the first aspect.
Alternatively, in the motor according to any one of 2 and 3, the stator core is brought into contact with and fixed to a rising portion of the circuit board.

In this case, since the stator core and the circuit board are fixed at the rising portion of the circuit board, a spacer or the like is not required and the accuracy of mounting the stator core is improved. Other members may be interposed between the stator core and the circuit board, if necessary. The circuit board and the stator core may be fixed by any fixing method other than screw fixing and caulking fixing. Furthermore, the outer shape of the stator core may be polygonal, circular, or any other shape.

A motor according to a fourth aspect of the present invention is the motor according to the first aspect.
Alternatively, in the motor described in any one of 2 and 3, the stator core is positioned by abutting the side edge of the stator core on the rising portion of the circuit board.

In this case, the positioning of the rising portion of the circuit board in the rotational direction is performed in addition to the positioning in the height direction, so that the spacer 64 which has been conventionally used becomes unnecessary.

A motor according to a fifth aspect of the present invention is the motor according to the first aspect.
Alternatively, in the motor according to any one of 2 and 3, the start-up portion of the circuit board has a first start-up portion for fixing the stator core at a predetermined height, and the stator core is positioned in a rotation direction at a side edge portion thereof. And a second start-up section for performing

In this case, since the stator core is fixed to a predetermined height by the first rising portion and the stator core is positioned by the second rising portion to prevent rotation, the stator core should be mounted on the circuit board with high accuracy. You can

A motor according to a sixth aspect of the present invention is the motor according to the fifth aspect.
In the motor described above, the first rising portion is a cut-and-raised portion obtained by die-cutting a part of the substrate into a tongue shape and cutting and raising it to a predetermined height.

In this case, since the first rising portion is a cut-and-raised portion obtained by die-cutting a part of the substrate into a tongue shape and cutting and raising it to a predetermined height, the spacer 62 conventionally used is unnecessary. Therefore, the integration error is reduced, and the accuracy of mounting the stator core can be further improved.

According to a seventh aspect of the present invention, there is provided a motor according to the fifth aspect.
In the motor described above, the first rising portion is a protruding portion or a bridge portion formed by protruding a part of the substrate to a predetermined height.

In this case, since the first rising portion is formed as the protruding portion or the bridge portion, the spacer 62 which has been used conventionally is not required, the integration error is reduced, and the mounting accuracy of the stator core is further improved. it can.

The motor of the invention described in claim 8 is the motor according to claim 5.
In the motor described above, a side edge portion of the stator core has a polygonal shape, and at least one side thereof is brought into contact with the second rising portion of the circuit board to perform positioning in the rotational direction.

In this case, one side of the side edge portion of the polygon is in contact with the second rising portion raised from the circuit board to perform positioning in the rotational direction, so that the stator core is prevented from rotating and the stator core is prevented from rotating. Can be accurately attached to the circuit board.

A motor according to a ninth aspect of the present invention is the motor according to the eighth aspect.
In the motor described above, the vicinity of the polygonal top of the stator core positioned by the second rising portion is fixed to the first rising portion.

In this case, the polygonal stator core is the second
Since the stator core is positioned by the rising portion and is fixed to the first rising portion, the stator core can be mounted on the circuit board with higher accuracy.

According to a tenth aspect of the invention, in the motor according to the first or second aspect, an opening formed by raising a part of the substrate is formed inside the outer region of the stator core. The rising part is provided.

In this case, since the opening formed by providing the rising portion is formed inside the outer shape region of the stator core, if the stator core generates heat when the motor rotates, the heat is radiated from the opening, so that the mounting is performed. The accuracy and heat dissipation can be improved. The motor according to claim 11, wherein in the motor according to claim 2, at least a part of the rising portion that abuts on the stator core of the metal-based substrate is formed by exposing the metal. I am trying.

In this case, at least a part of the rising portion of the metal substrate is formed by exposing the metal, and the metal surface is brought into direct contact with the stator core, whereby the heat of the stator core is easily transferred to the metal substrate, and the heat is radiated. It is possible to improve the property.

A motor according to a twelfth aspect of the present invention is characterized in that, in the motor according to the second aspect, the back surface of the substrate having the metal as a base material is formed by exposing the metal layer.

In this case, the heat transferred from the stator core to the metal substrate is radiated from the back surface thereof, so that the heat radiation property can be improved.

That is, when the stator core generates heat during rotation of the motor, the heat is transferred from the stator core to the metal substrate to be dissipated, so that the mounting accuracy can be improved and the heat dissipation can be improved.

According to a thirteenth aspect of the present invention, there is provided a motor-incorporated device in which the motor according to any one of the first to twelfth aspects is incorporated.

In this case, the laser can be accurately scanned at high speed by incorporating the motor into a motor built-in device such as a deflection scanning unit of a laser beam printer. Further, by using the motor for driving an optical disk device or a magnetic disk device, information can be recorded / reproduced on / from a recording medium such as an optical disk or a magnetic disk with high accuracy.

As a result of the above, it is possible to improve the mounting accuracy of the stator portion of the motor and the circuit board. As a result, various performances of the motor and the motor built-in device can be improved.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing the structure of a deflection scanning unit motor (scanner motor) which is one embodiment of the motor according to the present invention, and FIG. 2 is an AA ′ of the scanner motor of FIG.
Sectional drawing, FIG. 3 is a view showing a modified example of the cut-and-raised part of the scanner motor of FIG. 1, and FIG. 4 is a PCB of the scanner motor of FIG.
FIG.

In FIGS. 1 and 2, reference numeral 1 is a printed circuit board (PCB) as a circuit board of the scanner motor. This PCB1 uses a metal plate such as aluminum having good heat dissipation and workability as its base material, and is generally called a metal substrate. This PCB
On the surface of No. 1, electronic parts for driving a motor are mounted by surface mounting technology (SMT). As the electronic parts, for example, a motor driving IC, a socket, a hall element (not shown), and various parts constituting a rotating part of the motor are mounted.

Each part constituting the rotating part of the motor is divided into a stator side and a rotor side. The parts on the stator side are the stator coil 5, the housing 6, the stator core 7, etc., and the parts on the rotor side are the shaft 8 and the flange 1.
0, the magnet 12, the polygon mirror 14, and the like.

The stator side stator core 7 has a hexagonal side edge, and a screw fixing hole 7a (fixed portion) is provided at the top thereof. The stator core 7 is directly fixed to the lower PCB 1 by inserting a rivet (not shown) into the hole 7a. The PCB 1 is provided with a hole 2 for mounting the housing 6 at approximately the center thereof.
The housing 6 is inserted into the hole 2 and fixed by caulking or adhesive. The oil-impregnated metal material used for the housing 6 is a relatively soft material as compared with brass and aluminum, and fine processing such as shaft hole processing can be performed with high precision.

A sleeve which penetrates in the vertical direction is formed in the center of the housing 6, and a shaft (rotating shaft) 8 having a shaft diameter of, for example, φ 2 ± 0.001 mm is rotatably mounted in the sleeve. Has been. A flange 10 is fixed to the shaft 8. At the end of the flange 10, ring-shaped magnets (rotating magnets) 12 are attached inside the stator core 7 directly fixed to the PCB 1 by rivets or the like so as to face the respective stator coils 5. Furthermore this shaft 8
A polygon mirror 14 as a rotary polygon mirror is fixed above the flange 10.

On the other hand, the PCB 1 is provided with a first cut-and-raised portion 3 in which three parts of the PCB 1 are cut and raised in order to fix the stator core 7 at a predetermined height.
The first cut-and-raised portion 3 is obtained by stamping a part of the PCB 1 into a tongue shape, and directly raising the tongue part from the PCB 1 and bending it in a rectangular shape so as to be parallel to the PCB 1. . The first cut-and-raised portion 3 is composed of a base portion 3a, a tongue piece portion 3b, and a hole 3c (which overlaps with 7a in FIG. 2) as a stator core fixing portion provided in the tongue piece portion 3b.
The base portion 3a of B1 is arranged farther from the center of the hole 2 than the tongue portion 3b. Further, in order to position the stator core 7 on the straight line portion of the side edge of the hexagonal shape on this PCB 1, three parts of the corresponding PCB 1 are die-cut into a tongue shape and bent at a right angle from its base. A second cut and raised portion 4 is provided.

The second cut-and-raised portion 4 and the first cut-and-raised portion 3 are not limited to the shapes of this embodiment, and as a modification thereof, as shown in FIG. Projection part 21 that is partly rolled to project
Alternatively, a part of the substrate may be die-cut to form a bridge portion, and the bridge portion 22 may be formed by protruding the bridge portion. Since the bridge portion is supported on both sides by forming the bridge portion 22, the positioning accuracy can be further improved.

Further, since the resin substrate may be processed into various shapes at the time of molding, these are collectively referred to as a rising portion. Further, the positions of the first cut-and-raised parts 3 and the positions of the second cut-and-raised parts 4 may be variously changed according to the outer shape of the stator core 7.

As shown in FIG. 4, a wiring pattern (copper foil layer) 33 is formed on an aluminum layer (aluminum layer) 31 which is a base material of the PCB 1 with an insulating layer 32 interposed therebetween. A resist layer 34 is formed on the copper foil layer 33 by resist printing, and a silk layer 35 is formed on the resist layer 34 by silk printing.

The insulating layer 3 is formed on the surface of the tongue piece 3b of the first rising portion 3 which is in contact with the vicinity of the hole 7a of the stator core 7.
2, the copper foil layer 33, the silk layer 35, etc. are not formed, and the aluminum layer 31 is directly exposed to form the stator core 7 and the PCB.
When the tongue piece portion 3b of the first rising portion 3 of No. 1 is abutted and fixed, heat generated in the stator core 7 is applied to the aluminum layer 3
Since the heat is dissipated through 1, heat dissipation can be improved.

In the case of this scanner motor, when a driving signal is applied to the stator coil from the motor driving IC (driver IC), a magnetic field is generated, a driving force acts in a fixed direction on the magnet 12, and the rotor side including the flange 10 is moved. It rotates in a fixed direction together with the shaft 8.

When the rotor rotates, the Hall element detects the magnetic pole of the rotating magnet 12 to generate a position detection signal (waveform), which is input to the motor driving IC.

At this time, since each component on the stator side, that is, the stator core 7 is accurately fixed to the correct position on the PCB 1 by the cut-and-raised parts 3 and 4 etc. cut and raised directly from the PCB 1, there is no mounting error. The input timing error of the Hall element detection signal to the driver IC is reduced.

As a result, when the motor driving IC servos the rotation on the rotor side based on the position detection signal input to the motor driving IC, the motor rotates at a constant speed with high accuracy.

The components on the stator side, for example, the stator core 7 and the like generate heat when the stator coil 5 is energized, but P is oriented in such a way that an opening opens directly below the stator core 7.
Since the CB1 is provided with the plurality of cut-and-raised parts 3 and 4, heat dissipation (air permeability) is improved, and it is possible to benefit from heat generation measures.

Further, because of the structure of the PCB 1 itself, the aluminum layer 31 is exposed on the lower surface thereof, so that the heat transferred from the stator core 7 to the aluminum layer 31 through the contact surfaces thereof is radiated from the lower surface of the aluminum layer 31. The use of a metal plate as the base material of the PCB 1 for cutting and raising also improves heat dissipation.

Thus, according to this scanner motor,
The side edges of the stator core 7 are positioned by the cut-and-raised portions 4 at three locations where the PCB 1 is directly cut and raised, and the cut-and-raised portions 4 at a portion other than the cut-and-raised portions 4 are cut and raised. Since the hole 7a of the stator core 7 is fixed to the raised portion 3 with a screw or a screw, a spacer, a claw or the like is unnecessary, and an integration error in mounting these parts is eliminated.
The mounting accuracy of the stator core 7 and the PCB 1 is improved. Thereby, the rotation accuracy of the motor can be increased.

As a result, it is possible to contribute to the improvement of the image depiction performance of a device using this motor, such as a laser beam printer.

Next, with reference to FIG. 5, a specific application example to a motor built-in device will be described. FIG. 5 is a diagram showing a laser beam printer in which a scanner motor is incorporated as a deflection scanning unit.

In the figure, reference numeral 41 is a paper feed unit such as a tray. An image forming unit 42 transfers the image information onto the sheet supplied from the tray 41. An image fixing unit 43 fixes the image information transferred on the paper to the paper. Reference numeral 44 denotes a deflection scanning unit, which is the scanner motor itself. The deflection scanning unit 44 is fixed by screws or the like in a narrow space above the housing of this printer. The deflection scanning section 44 emits a laser beam from a laser light source unit (not shown) mounted on the substrate 1, reflects the laser beam on the polygon mirror 14 and the reflection plate 45, and outputs the laser beam to the image forming section 42. Four
Reference numeral 6 is each conveying means such as a roller.

In the case of this laser beam printer, since the scanner motor, which is the deflection scanning unit 44, has a high rotational accuracy, the polygon mirror 1 fixed on the upper portion of the flange 10 thereof.
4 can be driven accurately.

Therefore, the laser light emitted from the laser light source unit is emitted from the polygon mirror 1 of the scanner motor.
Since it is accurately reflected to the image forming unit 42 side by 4,
The deflection scanning of the laser light can be performed with high accuracy.

According to this laser beam printer, by incorporating a scanner motor having a high rotational accuracy as the deflection scanning section 44, it is possible to scan the laser beam with high accuracy. In the above embodiment, an example in which the motor of the present invention is used in a laser beam printer has been described.
The motor of the present invention is not limited to this,
For example, the performance of information recording / reproducing can be improved by using it as a motor for driving an optical disk device or a magnetic disk device.

[0063]

As described above, according to the present invention, since the stator core is fixed to the rising portion where the circuit board is directly raised, the spacers and the claws are not required, and the stator portion and the circuit board are separated from each other. Installation accuracy is improved. Thereby, the rotation accuracy of the motor can be increased.

Further, by fixing a polygon mirror to the shaft of the motor and using it as a deflection scanning section, it is possible to scan a laser beam with high accuracy and it becomes possible to use it in a laser beam printer or the like.

[Brief description of drawings]

FIG. 1 is a plan view showing the configuration of a scanner motor that is an embodiment of the present invention.

FIG. 2 is a diagram showing a cross section taken along the line AA ′ of the scanner motor of FIG.

FIG. 3 is a diagram showing another embodiment of the startup unit of the scanner motor.

FIG. 4 is a sectional view showing a PCB of this scanner motor.

FIG. 5 is a diagram showing a laser beam printer incorporating this scanner motor.

FIG. 6 is a diagram showing a conventional motor.

[Explanation of symbols]

1 ... Printed circuit board (PCB), 2 ... Hole, 3
... 1st cut-and-raised part, 4 ... 2nd cut-and-raised part, 5 ...
Stator coil, 6 ... Housing, 7 ... Stator core,
8 ... Shaft, 10 ... Flange, 12 ... Magnet, 1
4 ... Polygon mirror.

Claims (13)

[Claims] 1. A stator core provided with a stator coil; and a circuit board having a rising portion for raising a part of the substrate itself for fixing the stator core at a predetermined height. The motor to drive. 2. The motor according to claim 1, wherein the circuit board is a metal substrate having a base material of metal and a wiring pattern formed on the base material via an insulating layer. 3. The motor according to claim 1, wherein the stator core is abutted on and fixed to a rising portion of the circuit board. 4. The motor according to claim 1, wherein the stator core is positioned by abutting a side edge portion of the stator core on a rising portion of the circuit board. 5. The motor according to claim 1, wherein the rising portion of the circuit board has a first rising portion for fixing the stator core at a predetermined height; A second rising portion for positioning in the rotational direction at the side edge portion; 6. The motor according to claim 5, wherein the first rising portion is a cut-and-raised portion obtained by die-cutting a part of the substrate into a tongue shape and cutting and raising it to a predetermined height. And a motor. 7. The motor according to claim 5, wherein the first rising portion is a protruding portion or a bridge portion formed by protruding a part of the substrate to a predetermined height. motor. 8. The motor according to claim 5, wherein a side edge portion of the stator core has a polygonal shape, and at least one side of the side edge portion is in contact with a second rising portion of the circuit board for positioning in a rotational direction. A motor characterized by the above. 9. The motor according to claim 8, wherein the vicinity of the polygonal top of the stator core positioned by the second rising portion is fixed to the first rising portion. The motor to drive. 10. The motor according to claim 1, wherein the start-up portion is provided so that an opening formed by raising a part of the substrate is formed inside an outer shape region of the stator core. A motor characterized by. 11. The motor according to claim 2, wherein at least a part of the rising portion of the substrate having the metal as a base material, which is in contact with the stator core, is formed by exposing the metal. . 12. The motor according to claim 2, wherein the back surface of the substrate having the metal as a base material is formed by exposing the metal layer. 13. A device incorporating a motor, wherein the motor according to any one of claims 1 to 12 is incorporated.