JPH09269461A - Scanner motor and motor assembling equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a beam light reflection member from the occurrence of oil mist and to maintain performance by providing a rotor with a projection part projected from the beam light reflection member. SOLUTION: A magnet 12 (rotor) is provided with the projection part 13 projected in a centrifugal direction from the side end face of a polygon mirror 14. Thus, in the case lubricant in a sleeve 6a is leaked (oil mist occurs) while a motor is being rotated, the lubricant going down along the surface of the magnet 12 is scattered to the outside from the projection part 13 by centrifugal force, so that the lubricant is prevented from being stuck to the side end face (mirror part) of the mirror 14 existing inside (toward center) from the projection part 13. Therefore, the mirror 14 is protected from the occurrence of the oil mist and the scanning performance of the laser beam is maintained. Since a balance weight 15 is put in from space formed between the mirror 14 and the projection part 13 and fixed on the surface of the projection part 13, fixing work for the balance weight 15 is facilitated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scanner motor and a motor built-in device.

[0002]

2. Description of the Related Art Conventionally, scanner motors have been used in devices such as laser beam printers and disk drive devices. In recent years, with the downsizing of these devices,
There is a demand for a motor that is compact, has good workability in assembly, and has high performance.

A conventional scanner motor will be described with reference to FIG.

As shown in the figure, a conventional inner rotor type scanner motor is disclosed in Japanese Patent Laid-Open No. 5-297309.
Japanese Patent Laid-Open Publication No.
Thrust bearings 63, 63 are provided on the bottom of the housing 62.
On the other hand, the air bearing is formed in the gap formed by the outer peripheral portion 64a of the rotor 64 and the inner peripheral portion 62a of the housing 62, and the motor magnet 65 and the stator coil 66 are arranged inside the rotor to rotate. The drive part is formed and the rotor 6
4, a rotary polygon mirror 70 having a structure in which a polygon mirror portion 67 having a diameter larger than that of the rotor 64 is integrally fixed is disclosed.

In this case, since the bearing portion and the board mounting portion are made of the same member (housing 62), the adjustment time can be reduced and the predetermined performance can be efficiently achieved. Usually, the rotary polygon mirror 70 is incorporated in a laser beam printer or the like as a deflection scanning unit (scanner), and the polygon mirror unit 67 is used as a polygon mirror for scanning a laser beam.

For this reason, it is a condition for attachment to the laser beam printer that dirt or the like does not adhere to the mirror portion (beam light reflecting portion) of the polygon mirror 67.

However, in the conventional rotary polygon mirror 70, the rotor 64 is attached to the thrust bearings 16 and 16 '.
Is filled with lubricating oil (oil) for smoothing the rotation of the rotor 64. The oil travels along the inner wall surface of the rotor 74 as the rotor 64 rotates, and the outer peripheral portion 64a of the rotor 64.
(Oil mist) leaks to the polygonal mirror portion 67 integrally fixed to the rotor 64, and the mirror portion 67a on the side surface is soiled.

Further, in the conventional scanner motor, normally,
In order to balance the rotation of the rotor 64, after assembling the motor, the rotor 64 is rotated to measure the balance, and the balance weight is fixed to the balance position of the rotor 64. Due to the fact that the large polygonal mirror portion 67 is integrally fixed, the work of fixing the balance weight is very difficult, and the work efficiency is reduced.

[0009]

As described above, in the conventional rotary polygon mirror, that is, the scanner motor, oil mist is generated with the rotation of the rotor, and the oil adheres to the beam light reflection portion to cause the scanner motor to move. There was a problem of degrading performance.

The present invention has been made to solve the above problems, and provides a scanner motor and a motor built-in device capable of protecting the beam light reflecting portion from the generation of oil mist and thereby maintaining the performance. It is intended to be provided.

Another object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a scanner motor and a motor built-in device which can facilitate the work of fixing the balance weight and improve the work efficiency. I am trying.

[0012]

In order to achieve the above-mentioned object, a motor according to a first aspect of the present invention is fixed on a motor substrate, a housing having a sleeve formed therein, and a housing of the housing. A rotary shaft that is rotatably mounted through a fluid, a beam light reflecting member that is fixed so as to co-act with the rotary shaft around the rotary shaft, and has a side end surface that is a mirror, and the beam light reflecting member. A rotor having a diameter at least larger than that of the rotor and fixed so as to co-operate with the rotary shaft about the rotary shaft, and a stator located outside the rotor and directly or indirectly fixed to the housing. It is characterized by having. The sleeve may be integral with the substrate or separate.

In the case of the first aspect of the present invention, since the rotor having a diameter larger than that of the beam light reflecting member is fixed about the rotation axis, an oil miss from the sleeve occurs during the rotation of the rotor. However, the fluid that has propagated from the inside of the rotor to the surface, such as lubricating oil, will be scattered to the outside of the rotor by the centrifugal force of the rotor. Fluid such as lubricating oil will not adhere to the side end faces.

According to a second aspect of the present invention, a motor is fixed on a motor substrate and has a housing formed with a sleeve.
A rotating shaft mounted rotatably through a fluid injected into a sleeve of this housing, and a beam light reflecting member fixed so as to co-operate with the rotating shaft around the rotating shaft and having a side end surface in a mirror shape. A rotor fixed above or below the beam light reflecting member so as to co-operate with the rotary shaft about the rotary shaft, and directly or indirectly on the housing located outside the rotor. It is characterized in that the stator is fixed, and the rotor is provided with a protruding portion fixedly or integrally provided so as to protrude from the side end surface of the beam light reflecting member at least in the centrifugal direction.

In the case of the present invention as defined in claim 2, since the projecting portion is fixed or integrally provided to the rotor so as to project at least in the centrifugal direction from the side end surface of the beam light reflecting member, the rotor is rotated. Even if an oil miss occurs from the sleeve, the oil that has propagated from the inside of the rotor to the surface will be scattered to the outside of the rotor by the centrifugal force of the rotor. Oil does not adhere to the mirror-shaped side end surface of the beam light reflecting member in the direction).

A motor according to a third aspect of the present invention is the motor according to the second aspect.
In the motor described above, the projection is formed in a flange shape so as to cover a part of the mirror-shaped side end surface of the beam light reflecting member in a non-contact manner.

According to the third aspect of the present invention, since the protruding portion is formed in a flange shape so as to cover a part of the mirror-shaped side end surface of the beam light reflecting member in a non-contact manner, the oil is the beam light. It becomes more difficult to adhere to the reflection member.

A motor according to a fourth aspect of the present invention is the motor according to the first aspect.
Alternatively, in the motor according to any one of 2 above, on a protruding portion or a protruding portion protruding more than the beam light reflecting member,
It is characterized by further comprising a balance weight fixed at a position equidistant from the center of the rotating shaft.

In the case of the present invention as set forth in claim 4, since the balance weight is fixed on the protruding portion or the protruding portion protruding from the beam light reflecting member at a position equidistant from the center of the rotating shaft, The balance weight can be easily fixed even after the motor is assembled. According to a fifth aspect of the present invention, in the motor according to the first aspect or the second aspect, the surface of the protruding portion or the surface of the protruding portion protruding from the beam light reflecting member is equidistant from the center of the rotating shaft. It is characterized in that it is provided with a groove formed at the position and a balance weight applied or fixed to this groove.

In the case of the present invention as defined in claim 5, since the groove is formed at a position equidistant from the center of the rotating shaft on the surface of the protruding portion or the surface of the protruding portion protruding from the beam light reflecting member, The balance weight can be easily fixed even after the motor is assembled.

According to a sixth aspect of the present invention, there is provided a motor built-in device,
The motor according to any one of claims 1 to 5 is incorporated.

According to the sixth aspect of the present invention, the scanner motor can be accurately scanned at high speed by incorporating the scanner motor in a motor built-in device such as a deflection scanning unit of a laser beam printer. Further, by using the scanner 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 described above, the beam light reflecting portion can be protected from the generation of oil mist and the performance can be maintained. Further, the balance weight can be easily fixed and the work efficiency can be improved.

[0024]

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.
FIG. 3 is a sectional view, FIG. 3 is a view showing a modification of the cut-and-raised portion of the scanner motor of FIG. 1, and FIG. 4 is a view showing a PC board of the scanner motor of FIG.

1 and 2, reference numeral 1 is a printed circuit board (PC board) as a circuit board of the scanner motor. The PC plate 1 uses a metal plate such as aluminum having good heat dissipation and workability as its base material, and is generally called a metal substrate. Electronic components for driving the motor are mounted on the surface of the PC board 1 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 component of the motor is divided into a stator side and a rotor side. The components on the stator side are the stator coil 5, the housing 6, the stator core 7, and the like, and the components on the rotor side are the shaft 8, the flange 10, the magnet 12, the polygon mirror 14, and the like.

The circumference of the stator core 7 on the stator side is 6
It is square and has a hole for screwing on the top. The stator core 7 is directly fixed to the lower PC board 1 by inserting the screw 4 into this hole. The PC board 1 is provided with a hole for mounting the housing 6 in the substantially central portion thereof, and the housing 6 is inserted through the hole and fixed by caulking or adhesive fixing. 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 6a penetrating in the vertical direction is formed in a substantially central portion of the housing 6 and is filled with lubricating oil. A shaft (rotating shaft) 8 having a shaft diameter of, for example, φ2 ± 0.001 mm is rotatably mounted in the sleeve 6a through lubricating oil. A flange 10 is fixed to the shaft 8. A ring-shaped magnet (rotating magnet) 12 is attached to the end of the flange 10 so as to face the stator coil inside the stator core 7 directly fixed to the PC plate 1 with the screw 4.

Further, a polygon mirror 14 as a rotary polygon mirror (beam light reflecting member) is fixed on the shaft 8 above a flange 10. This polygon mirror 1
The side end surface 4 has a mirror shape and reflects the beam light. That is, the flange 10 and the magnet 1 are centered around the shaft 8.
2 rotates as a motor rotor, and the polygon mirror 14 rotates together with this motor rotor.

A projecting portion 13 is integrally provided with the magnet 12 so as to project from the side end surface of the polygon mirror 14 at least in the centrifugal direction. A balance weight 15 is fixed to the surface of the protruding portion 13 at a portion protruding from the side end surface of the polygon mirror 14 in the centrifugal direction.

On the other hand, the PC board 1 is provided with a board cut-and-raised portion 3 in which three parts of the PC board 1 are cut and raised to fix the stator core 7 at a predetermined height. The substrate cut-and-raised portion 3 is obtained by stamping a part of the PC board 1 into a tongue shape, directly raising the tongue piece part from the PC board 1, and forming a rectangular shape so as to be parallel to the PC board 1. It is a bent one.

In the case of this scanner motor, after the motor is assembled, the rotor portion is rotated to adjust the rotation balance. Specifically, the balance weight 1 is placed in the groove 13a formed at a position equidistant from the center of the shaft 8 on the upper surface of the protruding portion 13 protruding from the magnet 12.
Work to fix 5

At this time, the protrusion 13 is formed by the polygon mirror 14.
Since there is a space between the side surface of the polygon mirror 14 and the stator coil 5, the balance weight 1 is inserted into the groove 13a on the upper surface of the protrusion 13 from the space.
By attaching 5, the fixing work of the balance weight 15 can be performed easily.

When the scanner motor is rotated, when a drive signal is supplied from the motor drive IC (driver IC) to the stator coil, a magnetic field is generated and the magnet 1
A driving force acts in a fixed direction on the rotor 2, and the rotor side including the flange 10 and the magnet 12 rotates (cooperates) in one direction together with the shaft 8.

When the rotor side rotates, the lubricating oil gradually leaks from the housing 6 supporting the shaft 8 to generate oil mist.

Here, the path through which the lubricating oil leaks will be described.

The lubricating oil injected into the sleeve 6a of the housing 6 is applied to the inner wall surface of the magnet 12 through the inner wall surface of the flange 10 fixed upward from the surface of the shaft 8 by the centrifugal force of the rotation of the shaft 8. Further, the tip reaches the protruding portion 13 whose distal end faces the centrifugal direction through the outer peripheral surface of the magnet 12.

When the rotor side (the shaft 8, the magnet 12, the flange 10, etc.) is rotating, a centrifugal force always acts, so that the lubricating oil is projected from the protrusion 1 to the protrusion 1.
The surface of 3 does not propagate inward, but scatters outward.

Electrically, when the rotor side rotates,
The Hall element detects the magnetic pole of the magnet 12 to generate a position detection signal (waveform), which is input to the motor drive IC.
At this time, since the components on the stator side, that is, the stator core 7 and the like are accurately fixed to the correct positions on the PC board 1 by the board cut-and-raised portions 3 that are cut and raised directly from the PC board 1, mounting There is no error, and the error in the input timing of the Hall element detection signal to the driver IC is reduced. Based on the position detection signal input to the motor drive IC,
When the motor driving IC servos the rotation on the rotor side, the motor rotates at a constant speed with high accuracy.

Thus, according to this scanner motor,
When the magnet 12 (rotor) is provided with the protruding portion 13 protruding in the centrifugal direction from the side end surface of the polygon mirror 14, when the lubricating oil in the sleeve 6a leaks (the oil mistake occurs) while the motor rotates. The lubricating oil transmitted on the surface of the magnet 12 is scattered by the centrifugal force from the protruding portion 13 to the outside, and the side end surface (mirror portion) of the polygon mirror 14 inside (in the center direction) of the protruding portion 13 is located. The lubricating oil will not adhere to. Therefore, the polygon mirror 14 can be protected from the generation of oil mist, and the scanning performance of laser light can be maintained.

Further, since the balance weight 15 can be inserted from the space vacant between the polygon mirror 14 and the projecting portion 13 and fixed to the surface of the projecting portion 13, the work for fixing the balance weight 15 becomes easy and the work efficiency is improved. Can be improved.

The protrusion 13 is not limited to the above embodiment.

That is, as shown in FIG. 2, a protrusion 20 having an inverted L-shaped cross section may be formed so as to cover a part of the side surface (mirror surface) of the polygon mirror 14 in a non-contact manner.

In this case, the lubricating oil transmitted on the surface of the magnet 12 is scattered by the centrifugal force to the outside from the portion having the inverted L-shaped cross section of the protruding portion 20.
The lubricating oil does not adhere to the mirror portion of the polygon mirror 14 that is located further inside (in the center direction). Therefore, in the same manner as described above, the polygon mirror 14 is prevented from generating oil mist.
Can be protected and the scanning performance of laser light can be maintained.

Further, by fixing the balance weight 15 to the base portion of the protruding portion 20 which is bent in an inverted L-shape,
It becomes unnecessary to form the groove 13a for fixing the balance weight, and the labor of groove processing is eliminated. Further, since the balance weight 15 is attached along the inverted L-shaped wall surface of the protruding portion 20, the work for fixing the balance weight 15 is also facilitated and the work efficiency can be improved.

Further, as shown in FIG. 3, a part of the side surface (mirror surface) of the polygon mirror 14 may be covered in a non-contact manner, and at least the tip end portion may be a flange-shaped protrusion 21 facing the centrifugal direction. .

In this case, the lubricating oil transmitted on the surface of the magnet 12 is scattered by the centrifugal force to the outside from the tip of the protrusion 21, and the mirror portion of the polygon mirror 14 is more than the protrusion 20 of the modification. And the lubricating oil is less likely to adhere to it than in the examples shown in FIGS. 1 and 2 above.

Therefore, the polygon mirror 14 can be protected more than the above from the occurrence of oil mist, and the scanning performance of the laser beam can be maintained.

Further, in the example shown in FIG. 2, the magnet 1
Although an example is shown in which the protruding portion 20 that is bent in an inverted L-shape in cross section, that is, bent substantially at a right angle is provided from the upper surface of 2, the side surface (mirror surface) of the polygon mirror 14 is partially cut off as shown in FIG. The protrusion 22 may be provided at a predetermined angle (obtuse angle) so as to cover the contact.

In this case, the lubricating oil that has propagated on the surface of the magnet 12 is scattered by the centrifugal force from the tip of the protruding portion 22 to the outside, so that the lubricating oil does not adhere to the polygon mirror 14 as in the above-mentioned examples. Since the distance from the protruding portion 20 in the example of FIG. 2 to the mirror portion of the polygon mirror 14 is larger, the lubricating oil is less likely to adhere than in the example of FIG.

Next, a specific application example of the scanner motor will be described with reference to FIG. 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 laser beam reflection performance of the polygon mirror 14 of the scanner motor is maintained for a long period of time, when the scanner motor is used for the deflection scanning section 44, the life of the device is long. Can be realized.

According to this laser beam printer, the scanning performance of the laser beam can be maintained for a long period of time, and a scanner motor having a good rotational balance is incorporated as the deflection scanning section 44 to prolong the life of the apparatus and improve the reliability. can do.

In the example of FIG. 5, an example of using the scanner motor of the present invention in a laser beam printer has been described, but the present invention is not limited to this.
Any device can be applied as long as it drives a motor rotor and scans a laser beam with a mirror.

[0057]

As described above, according to the present invention, when the rotor is rotated by providing the rotor having a diameter larger than that of the beam light reflecting member, or providing the rotor with the protrusion protruding from the beam light reflecting member. Even if an oil miss occurs, the leaked fluid, such as lubricating oil, will scatter in the centrifugal direction from the rotor or protrusion due to the centrifugal force of the rotor, so the beam light reflection inside the rotor or protrusion will be reflected. Fluid such as lubricating oil does not adhere to the mirror-like side end surface of the member.

Further, when the balance weight is fixed, since it can be fixed on the protruding portion or the protruding portion protruding from the beam light reflecting member, the work of fixing the balance weight after assembling the motor becomes easy.

As a result, the beam light reflecting portion can be protected from the generation of oil mist, and the reflection performance of the beam light reflecting portion can be maintained. Also, the work of fixing the balance weight can be facilitated and the work efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a scanner motor that is one embodiment of the present invention.

FIG. 2 is a diagram showing another form of the protruding portion of the scanner motor.

FIG. 3 is a view showing another form of the protruding portion of the scanner motor.

FIG. 4 is a diagram showing another form of the protruding portion of the scanner motor.

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

FIG. 6 is a rotary polygon mirror 30 as a conventional scanner motor.
FIG.

[Explanation of symbols]

1 ... Printed circuit board (PC board), 2 ... Hole, 3
... Board cut-and-raised part, 4 ... Screw, 5 ... Stator coil, 6
… Housing, 7… Stator core, 8… Shaft, 10
… Flange, 12… Magnet, 13… Projection, 14…
Polygon mirror.

Claims (6)

[Claims] 1. A housing fixed on a motor substrate and having a sleeve formed therein; a rotary shaft rotatably mounted through a fluid injected into the sleeve of the housing; and the rotary shaft having the rotary shaft as a center. A beam light reflecting member that is fixed so as to move in cooperation with the side end surface of the mirror; a diameter of the beam light reflecting member is at least larger than that of the beam light reflecting member, and fixed so as to move around the rotation axis and the rotation axis. Scanner motor, and a stator located outside the rotor and directly or indirectly fixed to the housing. 2. A housing fixed on a motor substrate and having a sleeve formed thereon; a rotary shaft rotatably mounted through a fluid injected into the sleeve of the housing; and the rotary shaft having the rotary shaft as a center. A beam light reflecting member having a mirror-shaped side end surface, and fixed above and below the beam light reflecting member so as to move in cooperation with the rotation axis about the rotation axis. With a rotor;
A stator located outside the rotor and directly or indirectly fixed to the housing; fixedly or integrally provided to the rotor so as to project from the side end surface of the beam light reflecting member at least in the centrifugal direction. With protruding parts;
A scanner motor comprising: 3. The motor according to claim 2, wherein the protrusion is formed in a flange shape so as to cover a part of a mirror-shaped side end surface of the beam light reflecting member in a non-contact manner. . 4. The motor according to claim 1, wherein the balance is fixed at a position equidistant from the center of the rotating shaft on a protruding portion or a protruding portion protruding from the beam light reflecting member. A scanner motor further comprising a weight. 5. The motor according to claim 1, wherein the surface of the protruding portion protruding from the beam light reflecting member or the surface of the protruding portion is formed at a position equidistant from the center of the rotating shaft. A scanner motor comprising: a groove; and a balance weight applied or fixed to the groove. 6. A motor-incorporated device in which the motor according to any one of claims 1 to 5 is incorporated.