JP2001166249A - Rotary device and polygon mirror scanner device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polygon mirror scanner device which prevents a bearing from performance deterioration due to an outflow or a scatter of lubricating oil and also prevents vibration and noise from being generated. SOLUTION: The polygon mirror scanner device is equipped with a rotary shaft 3 fixed to a polygon mirror which has reflecting surfaces 1a as its flanks and rotates and a main body part having a radial bearing 4 which rotatably supports the polygon mirror 1 and rotary shaft 3 by engaging the rotary shaft 3. This device has the lubricating oil which is charged in the gap between the rotary shaft 3 and radial bearing 4 and a dynamic pressure generating groove which applies pressure from the open end side of the gap so that the lubricating oil is held in the gap.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating device and a polygon mirror scanner device which can be used as an optical deflector such as an image forming device such as a copying machine, a printer, a facsimile, and an image reading device.

[0002]

2. Description of the Related Art Hitherto, a polygon mirror scanner has been used in an image forming apparatus such as a copying machine. The rotary polygon mirror used in the polygon mirror scanner has a configuration in which a rotatable planar member has a mirror surface in a circumferential direction.
This mirror-finished rotary polygon mirror is assembled together with a rotor and a magnet, forms a rotor yoke of a scanner motor, and becomes a rotor of a polygon mirror scanner device.

FIG. 19 is a diagram showing a rotator of a conventional polygon mirror scanner device. As shown in FIG. 19, the rotating polygon mirror is assembled with a rotating shaft, a rotor yoke, a magnet, an E-ring, and the like to form a rotor of the polygon mirror scanner device.

FIG. 20 is a view showing a bearing device which supports a rotating shaft of a rotor in a conventional polygon mirror scanner device. As shown in FIG. 20, the bearing device is configured by assembling together a radial bearing that supports a rotating shaft, a thrust bearing that receives a thrust load of the rotating shaft, a stator yoke that supports the radial bearing, and a cap that prevents oil leakage. ing.

Although not shown, as a stator, a winding coil, which is a driving coil facing a magnet mounted in a rotor yoke at a predetermined distance, is disposed, and a control for switching energization of the winding coil is performed. By supporting a rotating shaft via a stator yoke on a substrate on which the device is arranged, the device functions as a motor for driving a rotating polygon mirror.

When the rotary polygon mirror is driven to rotate, the rotating shaft slides on the inner peripheral surface of the radial bearing, and the temperature of the radial bearing rises due to the generation of frictional heat due to the sliding. The infiltrated lubricating oil swells on the inner peripheral surface of the radial bearing due to expansion and a decrease in viscosity. The lubricating oil kept the frictional resistance between the rotating shaft and the radial bearing low to prevent metal contact and to maintain the life. In such a polygon mirror scanner device, there has been a demand for an increase in the number of rotations of the scanner motor in accordance with recent technological advances.

[0007]

However, in the above-described conventional configuration, the continuous rotation drive and operation at high speed are required.
By intermittently rotating the drive repeatedly, the rotary shaft slides on the inner peripheral surface of the radial bearing, and the sliding generates excessive frictional heat. Due to the excessive generation of this frictional heat, the temperature of the radial bearing rises significantly, and the lubricating oil soaked into the radial bearing flows out to the inner peripheral surface of the radial bearing due to excessive expansion and a significant decrease in viscosity, Lubricating oil leaks into the stator yoke.

Further, since the cap side has a closed structure, the internal pressure in the stator yoke rises, and lubricating oil flows out from the upper end side of the stator yoke, which has a low pressure due to a large centrifugal force, and scatters. As a result, there is a problem that the mirror surface is stained and the optical performance is significantly deteriorated.

Further, there is a problem that the lubricating oil is scattered, so that the rotating shaft and the radial bearing come into metallic contact with each other, so that the frictional resistance is increased, the radial bearing is deteriorated, and vibration and noise are generated.

The present invention has been made to solve the above-mentioned conventional problems, and has prevented the deterioration of the engaging portion engaged with the rotation center portion due to the outflow and scattering of the lubricating oil, and also prevented the generation of vibration and noise. It is an object of the present invention to provide a rotation device and a polygon mirror scanner device.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, there is provided a rotating center fixed to a rotating body and the rotating body is rotatably engaged with the rotating center. A main body having an engaging portion for supporting the rotating device,
A lubricating liquid filled in a gap between the rotation center portion and the engagement portion, and pressure generating means for applying pressure from an open end side of the gap so that the lubricating liquid is maintained in the gap. Rotating device. In this configuration, the pressure can be applied to the gap between the rotation center portion and the engagement portion by the pressure generating means, so that the lubricating oil flowing out from the gap can be suppressed, and leakage of the accumulated lubricating oil can be reduced. Can be prevented,
It is possible to provide a rotating device that can keep the frictional resistance between the rotation center portion and the engaging portion engaging with the rotation center portion low, prevent metal contact, and maintain a long life.

According to a second aspect of the present invention, in the rotating device according to the first aspect, the intensity of the pressure generated by the pressure generating means is increased by a magnetic force generated by a magnet for rotating the rotating body. It is characterized by being smaller than that. In this configuration, the strength of the pressure generated by the pressure generating means is smaller than the strength of the magnetic force generated by the magnet for rotating the rotating body, and therefore, a rotating device capable of preventing the rotating body from floating is provided. be able to.

According to a third aspect of the present invention, in the rotating device according to the first aspect, the pressure generating means is exposed in a space communicating with the gap and is concentric with a rotation center portion on the back surface of the rotating body. It is a spiral groove formed on the top surface of the center hole. In this configuration, pressure can be applied to the gap between the rotation center portion and the engagement portion by the dynamic pressure effect of the spiral groove, so that the lubricating oil flowing out from the gap can be suppressed, and the accumulated lubricating oil Leakage can be prevented, the frictional resistance between the center of rotation and the engaging portion engaging with the center of rotation can be kept low, metal contact can be prevented, long life can be maintained, and lubricating oil spills out. Since a separate component for suppressing the rotation is unnecessary, it is possible to provide a rotating device capable of suppressing an increase in cost.

According to a fourth aspect of the present invention, in the rotating device according to the first aspect, the pressure generating means is exposed in a space communicating with the gap and is concentric with a rotation center portion on the back surface of the rotating body. It is a herringbone groove formed on the side surface of the center hole. In this configuration, pressure can be applied to the gap between the rotation center portion and the engagement portion by the dynamic pressure effect of the herringbone groove, so that lubricating oil flowing out of the gap can be suppressed and accumulated. Lubricating oil can be prevented from leaking, the frictional resistance between the center of rotation and the engaging portion engaged with the center of rotation can be kept low, metal contact can be prevented, and long life can be maintained. Since a separate component for suppressing the outflow is not required, it is possible to provide a rotating device capable of suppressing an increase in cost.

[0015] The invention of claim 5 is the invention of claim 3 or 4.
Wherein the outer peripheral surface of the stator yoke is disposed so as to face the side surface in the center hole. With this configuration, it is possible to provide a rotating device capable of achieving a dynamic pressure effect of generating a pressure for suppressing the outflow of lubricating oil with a simple configuration.

According to a sixth aspect of the present invention, in the rotating device according to the first aspect, the pressure generating means is exposed in a space communicating with the gap and faces the outer periphery of the rotation center portion. It is characterized by being an annular groove formed in the circumferential direction on the back of the body. In this configuration, since the rotating body has an annular groove formed in the circumferential direction on the back surface of the rotating body facing the outer periphery of the rotation center, when the rotating body is inserted into the main body, air is introduced into the space between the rotating body and the main body. Can accumulate, creating a pressure difference between the gap and the space, preventing the lubricating oil from flowing out of the gap, keeping the frictional resistance between the rotating body and the engaging part of the main body low, and preventing metal contact In addition, it is possible to provide a rotating device capable of maintaining the life.

According to a seventh aspect of the present invention, in the rotating device according to the first aspect, the pressure generating means is exposed in a space communicating with the gap, and faces the inner periphery of the rotation center. It is characterized by being an annular groove formed in the circumferential direction on the back of the body. In this configuration, since the rotating body has an annular groove formed in the circumferential direction on the back surface of the rotating body facing the inner circumference of the rotation center, when the rotating body is inserted into the main body, air is introduced into the space between the rotating body and the main body. Can accumulate, creating a pressure difference between the gap and the space, preventing the lubricating oil from flowing out of the gap, keeping the frictional resistance between the rotating body and the engaging part of the main body low, and preventing metal contact In addition, it is possible to provide a rotating device capable of maintaining the life.

The invention of claim 8 is the invention of claim 5 or claim 6.
In the rotating device described in (1), a plurality of the annular grooves are formed in the axial direction. In this configuration,
It is possible to provide a rotating device capable of more reliably achieving the function and effect obtained by the fifth or sixth aspect.

According to a ninth aspect of the present invention, there is provided a rotation center portion fixed to a rotating polygon mirror having a plurality of reflection surfaces on side surfaces, and the polygon mirror and the rotation center portion engaged with the rotation center portion. A polygon mirror scanner device including a main body having an engaging portion rotatably supporting the lubricating liquid, wherein the lubricating liquid is filled in a gap between the rotation center portion and the engaging portion. A polygon mirror scanner device comprising: pressure generating means for applying pressure from an open end side of the gap so as to be maintained in the gap. In this configuration,
Pressure can be applied to the gap between the rotation center portion and the engaging portion by the pressure generating means, so that lubricating oil flowing out of the gap can be suppressed, and leakage of accumulated lubricating oil can be prevented, and rotation can be prevented. It is possible to provide a polygon mirror scanner device that can keep the frictional resistance between the center portion and the engaging portion that engages with the rotation center portion low, prevent metal contact, and maintain a long life.

According to a tenth aspect of the present invention, in the polygon mirror scanner according to the ninth aspect, the intensity of the pressure generated by the pressure generating means is generated by a magnet for rotating the polygon mirror rotating body. It is characterized by being smaller than the strength due to magnetic force. In this configuration, since the strength of the pressure generated by the pressure generating means is smaller than the strength of the magnetic force generated by the magnet for rotating the rotating body, the polygon mirror scanner device capable of preventing the rotating body from floating is provided. Can be provided.

According to an eleventh aspect of the present invention, in the polygon mirror scanner device according to the ninth aspect, the pressure generating means is exposed in a space communicating with the gap and is in contact with a rotation center of the back surface of the polygon mirror. It is a spiral groove formed on the top surface of the concentric center hole. In this configuration, pressure can be applied to the gap between the rotation center portion and the engagement portion by the dynamic pressure effect of the spiral groove, so that the lubricating oil flowing out from the gap can be suppressed, and the accumulated lubricating oil Leakage can be prevented, the frictional resistance between the center of rotation and the engaging portion engaging with the center of rotation can be kept low, metal contact can be prevented, long life can be maintained, and lubricating oil spills out. Since a separate component for suppressing this is unnecessary, it is possible to provide a polygon mirror scanner device capable of suppressing an increase in cost.

According to a twelfth aspect of the present invention, in the polygon mirror scanner according to the ninth aspect, the pressure generating means is exposed in a space communicating with the gap and is in contact with a rotation center of the back surface of the polygon mirror. It is characterized by being a herringbone groove formed on the side of the concentric center hole. In this configuration, pressure can be applied to the gap between the rotation center portion and the engagement portion by the dynamic pressure effect of the herringbone groove, so that lubricating oil flowing out of the gap can be suppressed and accumulated. Lubricating oil leakage can be prevented,
A separate component for keeping the frictional resistance between the center of rotation and the engaging part engaging with the center of rotation low, preventing metal contact, maintaining a long service life, and suppressing outflow of lubricating oil Since it is unnecessary, it is possible to provide a polygon mirror scanner device capable of suppressing an increase in cost.

According to a thirteenth aspect of the present invention, in the polygon mirror scanner device according to the eleventh or twelfth aspect,
An outer peripheral surface of the stator yoke is arranged to face a side surface in the center hole. In this configuration,
It is possible to provide a polygon mirror scanner device capable of achieving a dynamic pressure effect of generating a pressure for suppressing the outflow of lubricating oil with a simple configuration.

According to a fourteenth aspect of the present invention, in the polygon mirror scanner according to the ninth aspect, the pressure generating means is exposed in a space communicating with the gap, and the rotation center of the back surface of the polygon mirror is rotated. It is characterized in that it is an annular groove formed on the surface facing the outer periphery in the circumferential direction. In this configuration, since the rotating body has an annular groove formed in the circumferential direction on the back surface of the rotating body facing the outer periphery of the rotation center, when the rotating body is inserted into the main body, air is introduced into the space between the rotating body and the main body. Can accumulate, creating a pressure difference between the gap and the space, preventing the lubricating oil from flowing out of the gap, keeping the frictional resistance between the rotating body and the engaging part of the main body low, and preventing metal contact Thus, it is possible to provide a polygon mirror scanner device capable of maintaining the life.

According to a fifteenth aspect of the present invention, in the polygon mirror scanner device according to the ninth aspect, the pressure generating means is exposed in a space communicating with the gap, and the rotation center of the polygon mirror back surface is rotated. It is characterized in that it is an annular groove formed on a surface facing the inner circumference.
In this configuration, since the rotating body has an annular groove formed in the circumferential direction on the back surface of the rotating body facing the inner circumference of the rotation center, when the rotating body is inserted into the main body, air is introduced into the space between the rotating body and the main body. Can accumulate, creating a pressure difference between the gap and the space, preventing the lubricating oil from flowing out of the gap, keeping the frictional resistance between the rotating body and the engaging part of the main body low, and preventing metal contact Thus, it is possible to provide a polygon mirror scanner device capable of maintaining the life.

According to a sixteenth aspect of the present invention, in the polygon mirror scanner device according to the thirteenth or fourteenth aspect,
A plurality of the annular grooves are formed in the axial direction. With this configuration, it is possible to provide a polygon mirror scanner device that can more reliably achieve the functions and effects obtained by the fifth and sixth aspects.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of the polygon mirror scanner device of the present embodiment. As shown in FIG. 1, the polygon mirror scanner device includes a mirror rotor 1 integrally formed with a magnet 2, a rotor portion 1b, a tip portion 1c, and a side surface portion 1a, a rotating shaft 3, and a stator yoke 5 A radial bearing 4 which is an engagement portion that supports the shaft, a thrust bearing 7, a winding coil 6 which is a magnetic force generating member fixed to the stator yoke 5 facing the magnet 2,
A control board 9 attached to the stator yoke 5.

The mirror / rotor 1 has a rotating shaft 3 fixed to a tip portion 1c which is a center shaft fixing portion, and has a cylindrical rotor portion 1b integrally near the lower surface center.
The magnet 2 is fixed to the inside of b by bonding, press-fitting or the like, and constitutes a rotor B.

As the stator portion A, a winding coil 6 facing the magnet 2 of the rotor B at a predetermined distance is fixed to the outer periphery of the hollow cylindrical portion of the stator yoke 5. Is opposed to the inner cylindrical surface of the magnet 2 while keeping a certain interval. In addition,
This winding coil 6 may be fixed to the control board 9.

Further, since the outer peripheral surface of the stator yoke 5 is arranged so as to face the side surface in the center hole 1d, a dynamic pressure effect for generating a pressure for suppressing the outflow of lubricating oil, which will be described later, is achieved with a simple configuration. can do.

FIG. 2 is an exploded perspective view of a rotor in the polygon mirror scanner device of FIG. 1, and FIG. 3 is a sectional view of the rotor in the first embodiment according to the present invention.
As shown in FIG. 2, the mirror rotor 1 has a side surface portion (6 in the illustrated example) on which an appropriate number of smooth light reflecting surfaces are formed on the peripheral surface.
(A bottom surface is a regular hexagon in the illustrated example) having a horizontal plane portion 1p having a surface 1a in the circumferential direction.

As shown in FIG. 3, the side wall of the rotor 1b is perpendicular to the horizontal plane 1p, and the magnet 2 is bonded and fixed to the inner peripheral surface of the side wall of the rotor 1b at a position separated from the horizontal plane 1p. I have. The tip 1c has a cylindrical shape concentric with the rotor 1b, and holds the rotating shaft 3 at the center. A rotating shaft 3 and a cylindrical center hole 1d concentric with the rotating shaft 3 and opened in the axial direction are formed between the tip portion 1c and the rotor portion 1b, and a dynamic pressure is generated on the top surface inside the center hole 1d. A spiral groove (see FIG. 6) 1e, which is a groove, is formed. The spiral groove (see FIG. 6) 1e is a pressure generating means. The depth, pitch, etc. of the spiral groove are such that the strength of the upward component of the pressure generated by the pressure generating means is smaller than the strength of the downward component due to the magnetic force generated by the magnet 2 for rotating the rotor B. Can be appropriately changed to prevent the rotor B from rising upward due to pressure.

According to this polygon mirror scanner, the rotary shaft 3 and the radial bearing 4 are formed by the spiral groove 1e.
Pressure can be applied to the gap between the rotating shaft 3 and the rotating shaft 3 and the radial shaft engaging with the rotating shaft 3. Friction resistance with the bearing 4 can be kept low, metal contact can be prevented, and long life can be maintained.

FIG. 4 is a sectional view of a rotor according to a second embodiment of the present invention. As shown in FIG. 4, the rotor 2B of the second embodiment is different from the rotor of the first embodiment in that a side surface portion 1a having a reflecting surface is formed in two upper and lower stages. This is the same as the rotor of the first embodiment. Reference numeral 11 denotes a mirror rotor.

FIG. 5 is a sectional view of a rotor according to a third embodiment of the present invention. As shown in FIG. 5, the rotor 3B of the third embodiment has a regular prism shape (a bottom surface in the illustrated example) having a circumferential side surface portion 1a in which an appropriate number of smooth light reflecting surfaces are machined. Is a regular hexagon) horizontal plane part 1p
have. The rotor portion 1b, which is a rotor yoke, has a cylindrical tip portion 1c on which the upper end of the rotating shaft 3 is fitted.
The magnet 2 is press-fitted and fixed to the inner peripheral surface of the side wall on the lower surface side. A rotary shaft 3 and a cylindrical central hole 1d concentric with the rotary shaft 3 and open in the axial direction are formed between the tip portion 1c and the rotor portion 1b, and the top surface inside the central hole is shown in FIG. The structure has a spiral groove 1e. The horizontal surface portion 1p is placed on a surface orthogonal to the cylindrical tip portion 1c provided on the upper surface side of the rotor portion 1b, and the outer peripheral portion of the cylindrical tip portion 1c provided on the upper surface side of the rotor portion 1b and the horizontal surface portion 1p The rotor 3 of the polygon mirror scanner device assembled above is fitted and shrink-fitted and fixed on the inner peripheral surface of the polygon mirror scanner device.
Construct B. Reference numeral 21 denotes a mirror rotor.

In FIG. 1, the rotating shaft 3 serving as the center of rotation of the rotor B constructed as described above is inserted into the inner peripheral surface of a radial bearing 4 which is supported by the stator yoke 5. And
The energization of the winding coil 6 is switched to drive the rotor B. At this time, the rotary shaft 3 and the spiral groove 1e (see FIGS. 3 to 6) formed on the top surface of the cylindrical center hole 1d concentric with the rotary shaft 3 and opened in the axial direction are also driven to rotate. By doing so, a dynamic pressure effect is generated, and lubricating oil flowing out from the upper end portion of the stator yoke 5 can be suppressed by the pressure generated here.

By setting the gap between the outer peripheral surface of the stator yoke 5 and the inner peripheral surface of the center hole 1d to be 0.1 mm, the top surface of the cylindrical center hole 1d concentric with the rotating shaft 3 and opened in the axial direction. The air flow generated by the rotational drive of the spiral groove 1e formed in the hole becomes difficult to leak, and the pressure is accumulated between the lower end of the tip 1c and the upper end surface of the radial bearing 4 to form a high-pressure space. This has the effect of suppressing lubricating oil flowing out from the upper end of the radial bearing 4. From the above, the leakage of the lubricating oil accumulated in the stator yoke 5 can be prevented, the frictional resistance between the rotating shaft 3 and the bearings 4, 7 can be kept low, metal contact can be prevented, and the life can be maintained.

FIG. 7 is a sectional view of a rotor according to a fourth embodiment of the present invention. As shown in FIG. 7, the side wall portion of the rotor portion 1b provided in the rotor 4B of the fourth embodiment is orthogonal to the horizontal surface portion 1p, and is located on the inner peripheral surface of the side wall of the rotor portion 1b at a position separated from the horizontal surface portion 1p. The magnet 2 is bonded and fixed. The tip 1c has a cylindrical shape concentric with the rotor 1b, and holds the rotating shaft 3 at the center. Tip 1c
A rotary shaft 3 and a cylindrical center hole 1d concentric with the rotary shaft 3 and opened in the axial direction between the rotary shaft 3 and the rotor portion 1b;
A herringbone groove (see FIG. 10) 1f, which is a dynamic pressure generating groove, is formed on a side surface inside the center hole. This herringbone groove (see FIG. 10) 1f is a pressure generating means. Reference numeral 31 denotes a mirror rotor.

According to this embodiment, the herringbone groove 1
Pressure can be applied to the gap between the rotating shaft 3 and the radial bearing 4 by the dynamic pressure effect of f, so that lubricating oil flowing out from the gap can be suppressed, and leakage of accumulated lubricating oil can be prevented. Another component for keeping the frictional resistance between the rotating shaft 3 and the radial bearing 4 engaged with the rotating shaft 3 low, preventing metal contact, maintaining a long service life, and suppressing outflow of lubricating oil. Is unnecessary, so that an increase in cost can be suppressed.

FIG. 8 is a sectional view of a rotor according to a fifth embodiment of the present invention. As shown in FIG. 8, the rotor 5B of the fifth embodiment has a side portion 1a having a reflecting surface,
The point formed in the step is different from the rotor of the fourth embodiment,
Other structures are the same as those of the rotor 4B of the fourth embodiment. Reference numeral 41 denotes a mirror rotor.

FIG. 9 is a sectional view of a rotor according to a sixth embodiment of the present invention. As shown in FIG. 9, the rotor 6 </ b> B of the sixth embodiment has a regular prism shape having a circumferential side surface portion 1 a on which an appropriate number of smooth light reflecting surfaces are machined (in the illustrated example, the bottom surface is formed). (A regular hexagon). The rotor part 1b has a cylindrical tip part 1c to which the upper end part of the rotating shaft 3 is fitted on the upper surface side, and the magnet 2 is press-fitted and fixed to the inner peripheral surface of the side wall on the lower surface side. A rotating shaft 3 and a cylindrical center hole 1d concentric with the rotating shaft 3 and open in the axial direction are formed between the tip portion 1c and the rotor portion 1b. Ring bone groove 1
f is formed. Reference numeral 51
Is a mirror rotor.

The horizontal plane portion 1p is placed on a surface orthogonal to the cylindrical tip portion 1c provided on the upper surface side of the rotor portion 1b, and has a cylindrical tip portion 1c provided on the upper surface side of the rotor portion 1b.
Is fitted to the inner peripheral surface of the horizontal surface portion 1p, and shrink-fitted and fixed to form the rotor B of the polygon mirror scanner device assembled above.

In FIG. 1, the rotating shaft 3 serving as the center of rotation of the rotor B constructed as described above is inserted into the inner peripheral surface of the radial bearing 4 which is supported by the stator yoke 5. And
The energization of the winding coil 6 is switched to drive the rotor B. At this time, the rotating shaft 3 and the herringbone groove 1f formed on the side surface of the cylindrical center hole 1d concentric with the rotating shaft 3 and opened in the axial direction are also driven to rotate. As a result, the lubricating oil flowing out from the upper end of the stator yoke 5 can be suppressed by the pressure generated here.

By setting the gap between the outer peripheral surface of the stator yoke 5 and the inner peripheral surface of the center hole 1d to 0.1 mm, a cylindrical center hole 1d concentric with the rotating shaft 3 and opened in the axial direction is formed.
The air flow generated by the rotation of the herringbone groove 1f formed on the side surface is less likely to leak, and the pressure is accumulated between the lower end of the distal end portion 1c and the upper end surface of the radial bearing 4, so that high pressure is generated. A space can be formed, which has an effect of suppressing lubricating oil flowing out from the upper end of the radial bearing 4.
From the above, the leakage of the lubricating oil accumulated in the stator yoke 5 is prevented, the frictional resistance between the rotating shaft and the bearing is kept low, metal contact is prevented, and the life can be maintained.

FIG. 11 is a sectional view of a rotor according to a seventh embodiment of the present invention. As shown in FIG.
The side wall portion of the rotor portion 1b provided in the rotor 7B of the embodiment is as follows.
The magnet 2 is bonded and fixed to the inner peripheral surface of the side wall of the rotor portion 1b at a position orthogonal to the horizontal surface portion 1p having the side surface portion 1a and slightly away from the horizontal surface portion 1p. The tip 1c is formed in a cylindrical shape concentric with the rotor 1b.
And the inside is formed in a convex shape at the position from the rotary shaft 3 to the upper side. A cylindrical central hole 1d is provided between the distal end portion 1c and the rotor portion 1b and is concentric with the rotating shaft 3 and is open in the same direction as the axis. An annular groove is formed on the inner peripheral surface of the central hole 1d. The structure is formed in the direction. Note that reference numeral 6
1 is a mirror rotor.

FIG. 12 is a sectional view of a rotor according to an eighth embodiment of the present invention. As shown in FIG.
The rotor 8B according to the embodiment is different from the rotor according to the seventh embodiment in that the side surface portion 1a having the reflection surface is formed in two upper and lower stages, and the other structure is the same as that of the rotor 7B according to the seventh embodiment. Is configured. Reference numeral 71 denotes a mirror rotor.

FIG. 13 is a sectional view of a rotor according to a ninth embodiment of the present invention. As shown in FIG.
The rotor 9B of the embodiment has a horizontal plane portion 1p of a regular prism (in the illustrated example, the bottom surface is a regular hexagon) having a circumferential side surface portion 1a on which an appropriate number of smooth light reflecting surfaces are machined. Have. The rotor part 1b has a cylindrical tip part 1c for fitting the upper end part of the rotating shaft 3 on the upper surface side, and the magnet 2 is press-fitted and fixed to the inner peripheral surface of the side wall on the lower surface side. Tip 1
c and the yoke portion 1b, a cylindrical center hole 1d concentric with the rotating shaft 3 and opened in the same direction as the shaft is provided, and an annular groove 1g is formed on the inner peripheral surface of the center hole 1d. The structure is formed in the direction.

The horizontal plane 1p is placed on a surface orthogonal to the cylindrical tip 1c on the upper surface of the yoke 1b, and the cylindrical tip 1c on the upper surface of the yoke 1b. And the inner peripheral surface of the mirror rotor 81 are fitted and shrink-fitted and fixed to form the rotor 9B of the polygon mirror scanner device assembled above.

FIG. 14 is a sectional view showing a main part when the rotator of the seventh embodiment of FIG. 11 is used in the polygon mirror scanner of FIG. As shown in FIG. 14, the stator yoke 5 is provided on the inner peripheral surface of the center hole 1d of the rotor 7B of the seventh embodiment.
When the rotating shaft 3 of the rotor 7B is inserted into the
The gap between the lower end of the stator yoke 5 and the upper end of the stator yoke 5 as a bearing housing is 0.5 mm, the gap between the inner peripheral surface of the central hole 1d and the outer peripheral surface of the stator yoke 5 is 0.1 mm, and the inner peripheral surface of the central hole 1d. Of the groove 1g and the stator yoke 5
The structure is such that the gap with the outer peripheral surface is 1.0 mm.

The lower end of the tip 1c and the stator yoke 5
By providing a space between the upper end portion and the upper end portion, air is stored when the rotor 7B is assembled. Also, the tip 1c
By making the gap between the inner peripheral surface of the center hole 1d and the outer peripheral surface of the radial bearing 4 0.1 mm in order to make it difficult for air stored in the space between the lower end and the upper end of the stator yoke 5 to leak,
Apply a pressure difference to reduce air flow.

In order to further prevent air from leaking, an annular groove 1g as a groove is provided on the inner peripheral surface of the center hole 1d, so that the annular groove 1g when the rotor 7B is assembled.
Air is stored in the end portion 1 c and the lower end of the stator yoke 5.
The flow of air stored in the space between the upper end and the upper end can be suppressed.

FIG. 15 is a sectional view showing an essential part when the rotator of the tenth embodiment of FIG. 16 is used in the polygon mirror scanner of FIG. 1, and FIG. 16 shows a tenth embodiment according to the present invention. It is sectional drawing of the rotor in an Example. Figures 15 and 1
As shown in FIG. 6, the rotor 10B of the tenth embodiment has a cylindrical central hole opened between the tip portion 1c and the rotor portion 1b in the same direction as the rotating shaft 3 and concentric with the rotating shaft 3. 1i, and has a cylindrical portion 1j which is a projection concentric with the rotating shaft 3 inside the center hole 1i, and an annular groove 1k is formed on the outer peripheral surface of the cylindrical portion 1j in the circumferential direction. Has become. Reference numeral 91 denotes a mirror rotor.

When the rotating shaft 3 of the rotor 10B is inserted into the stator yoke 5, the outer peripheral surface of the lower end of the cylindrical portion 1j and the inner surface of the stator yoke 5 The structure is such that the gap with the peripheral surface is 0.1 mm, and the gap between the bottom surface of the groove 1 k formed on the outer peripheral surface of the cylindrical portion 1 j and the inner peripheral surface of the stator yoke 5 is 1.0 mm.

By providing a space between the lower end of the cylindrical portion 1j and the radial bearing 4, air is stored when the rotor 10B is assembled. In order to make it difficult for the air stored in this space to leak, the gap between the outer peripheral surface of the lower end 1m of the cylindrical portion 1j and the inner peripheral surface of the stator yoke 5 is set to 0.1 mm, so that a pressure difference is provided and the flow of air is increased. Can be reduced.

Further, in order to make it more difficult for air to leak, a groove 1k is provided on the outer peripheral surface of the cylindrical portion 1j so that the groove 1k on the outer peripheral surface of the cylindrical portion 1j when the rotor 10B is assembled.
k, the lower end of the cylindrical portion 1j and the radial bearing 5
The flow of the air accumulated in the space between and can be suppressed.

As described above, the leakage of the lubricating oil accumulated in the stator yoke 5 can be prevented, the frictional resistance between the rotating shaft 3 and the bearing 4 can be kept low, metal contact can be prevented, and the life can be maintained. .

FIG. 17 is a sectional view of a rotor according to an eleventh embodiment of the present invention. As shown in FIG.
The rotator 11B of the eleventh embodiment differs from the rotator 7B of the seventh embodiment of FIG. 11 in that a side surface portion 1a having a reflecting surface is formed in two upper and lower stages. Of the rotor 7B. Reference numeral 101 denotes a mirror rotor.

FIG. 18 is a sectional view of a rotor according to a twelfth embodiment of the present invention. As shown in FIG.
The rotator 12B of the twelfth embodiment differs from the rotator 10B of the tenth embodiment of FIGS. 15 and 16 in that side portions 1a having reflection surfaces are formed in two upper and lower stages.
This is the same as the rotor 10B of the embodiment. Note that reference numeral 111
Is a mirror rotor.

When the rotors of the seventh to ninth and eleventh embodiments are used, when the stator yoke 5 is inserted into the inner peripheral surface of the center hole 1d of the rotor 3, the lower end of the tip 1c and the stator yoke 5 Air accumulates in the gap with the upper end, and the space between the lower end of the tip 1c and the upper end 5a of the stator yoke 5, and the center hole 1
d By providing a pressure difference between the inner peripheral surface and the gap between the outer peripheral surface 5b of the stator yoke 5, even if the internal pressure of the stator yoke 5 rises and a force for pushing out the lubricating oil acts,
Lubricating oil can be prevented from flowing out from the distal end side of the stator yoke 5, the frictional resistance between the rotating shaft 3 and a bearing such as the radial bearing 4 can be kept low, metal contact can be prevented, and the life can be maintained long. .

When the rotors of the tenth and twelfth embodiments are used, the stator yoke 5 is provided inside the center hole 1d of the rotor.
When air is inserted, air accumulates in the space between the lower end of the cylindrical portion 1j and the upper end of the bearing, and a pressure difference is created between this space and the gap between the outer peripheral surface of the cylindrical portion 1j and the inner peripheral surface of the stator yoke 5. As a result, the internal pressure of the stator yoke 5 increases,
Even if a force for pushing out the lubricating oil acts, the lubricating oil can be prevented from flowing out from the tip side of the stator yoke 5,
The frictional resistance between the rotating shaft 3 and a bearing such as the radial bearing 4 can be kept low, metal contact can be prevented, and the life can be maintained.

In the above embodiment, the case of the polygon mirror scanner has been described. However, in addition to the polygon mirror scanner, the rotation center fixed to the rotating body and the rotation center engaged with the rotation center may be used. The present invention can be applied to a rotating device including a main body having an engaging portion that rotatably supports a rotating body. The present invention is not limited to the above embodiment. That is, various modifications can be made without departing from the gist of the present invention.

[0062]

As described above, according to the first aspect of the present invention, since the pressure can be applied to the gap between the rotation center portion and the engaging portion by the pressure generating means, the pressure tends to flow out of the gap. The lubricating oil can be suppressed, the leakage of accumulated lubricating oil can be prevented, the frictional resistance between the center of rotation and the engaging part engaging with the center of rotation can be kept low, and metal contact can be prevented. A rotating device that can maintain a long life can be provided.

According to the second aspect of the present invention, the strength of the pressure generated by the pressure generating means is smaller than the strength of the magnetic force generated by the magnet for rotating the rotating body. A rotating device that can be prevented can be provided.

According to the third aspect of the present invention, pressure can be applied to the gap between the rotation center portion and the engagement portion by the dynamic pressure effect of the spiral groove, so that lubricating oil flowing out from the gap can be suppressed. It can prevent leakage of accumulated lubricating oil, keep the frictional resistance between the center of rotation and the engaging part engaging with the center of rotation low, prevent metal contact, and maintain long life In addition, since a separate component for suppressing the outflow of lubricating oil is not required, it is possible to provide a rotating device capable of suppressing an increase in cost.

According to the fourth aspect of the present invention, a pressure can be applied to the gap between the rotation center portion and the engagement portion by the dynamic pressure effect of the herringbone groove, so that the lubricating oil flowing out of the gap can be applied. Can prevent the leakage of accumulated lubricating oil, keep the frictional resistance between the center of rotation and the engaging part engaged with the center of rotation low, prevent metal contact, and long service life Therefore, it is possible to provide a rotating device capable of suppressing an increase in cost because a separate component for suppressing outflow of lubricating oil is not required.

Further, according to the fifth aspect of the present invention, it is possible to provide a rotating device capable of achieving a dynamic pressure effect of generating a pressure for suppressing the outflow of lubricating oil with a simple configuration.

According to the sixth aspect of the present invention, since the rotating body has the annular groove formed in the circumferential direction of the back surface of the rotating body facing the outer periphery of the rotating center, when the rotating body is inserted into the main body,
Air accumulates in the space between the rotating body and the main body, a pressure difference between the gap and the space can be provided, and lubricating oil can be prevented from flowing out of the gap to the outside. And a rotating device capable of maintaining low frictional resistance, preventing metal contact, and maintaining a long life.

According to the seventh aspect of the present invention, since the rotating body has the annular groove formed in the circumferential direction on the back surface of the rotating body opposed to the inner circumference of the rotation center portion, when the rotating body is inserted into the main body,
Air accumulates in the space between the rotating body and the main body, a pressure difference between the gap and the space can be provided, and lubricating oil can be prevented from flowing out of the gap to the outside. And a rotating device capable of maintaining low frictional resistance, preventing metal contact, and maintaining a long life.

Further, according to the invention of claim 8, according to claim 5,
Alternatively, it is possible to provide a rotating device capable of more reliably achieving the effects obtained by the method (6).

According to the ninth aspect of the present invention, since the pressure can be applied to the gap between the rotation center portion and the engagement portion by the pressure generating means, the lubricating oil flowing out from the gap can be suppressed. It can prevent leakage of accumulated lubricating oil, keep the frictional resistance between the rotation center and the engaging part engaging with the rotation center low, prevent metal contact, and maintain long life Thus, a polygon mirror scanner device that can be provided can be provided.

Further, according to the tenth aspect of the present invention, the strength of the pressure generated by the pressure generating means is smaller than the strength of the magnetic force generated by the magnet for rotating the rotating body. It is possible to provide a polygon mirror scanner device that can prevent such a problem.

According to the eleventh aspect of the present invention, the pressure can be applied to the gap between the rotation center portion and the engaging portion by the dynamic pressure effect of the spiral groove, so that the lubricating oil flowing out from the gap is suppressed. It can prevent leakage of accumulated lubricating oil, keep the frictional resistance between the center of rotation and the engaging part engaging with the center of rotation low, prevent metal contact, and maintain long life In addition, since a separate component for suppressing the outflow of lubricating oil is not required, a polygon mirror scanner device that can suppress an increase in cost can be provided.

According to the twelfth aspect of the present invention, the pressure can be applied to the gap between the center of rotation and the engaging portion by the dynamic pressure effect of the herringbone groove, so that the lubricating oil flowing out of the gap can be applied. Can prevent the leakage of accumulated lubricating oil, keep the frictional resistance between the center of rotation and the engaging part engaged with the center of rotation low, prevent metal contact, and long service life Can be maintained,
Since a separate component for suppressing the outflow of lubricating oil is unnecessary, it is possible to provide a polygon mirror scanner device capable of suppressing an increase in cost.

Further, according to the thirteenth aspect of the present invention, it is possible to provide a polygon mirror scanner device capable of achieving a dynamic pressure effect for generating a pressure for suppressing the outflow of lubricating oil with a simple configuration.

According to the fourteenth aspect of the present invention, since the rotating body has the annular groove formed in the circumferential direction on the back surface of the rotating body facing the outer periphery of the rotating center, the rotating body is inserted when the rotating body is inserted into the main body. Air accumulates in the space between the body and the body, creating a pressure difference between the gap and the space, preventing the lubricating oil from flowing out of the gap, It is possible to provide a polygon mirror scanner device that can keep friction resistance low, prevent metal contact, and maintain its life.

According to the fifteenth aspect of the present invention, since the rotating body has the annular groove formed in the circumferential direction on the back surface of the rotating body facing the inner circumference of the rotating center, the rotating body is inserted when the rotating body is inserted into the main body. Air accumulates in the space between the body and the body, creating a pressure difference between the gap and the space, preventing the lubricating oil from flowing out of the gap, It is possible to provide a polygon mirror scanner device that can keep friction resistance low, prevent metal contact, and maintain its life.

According to the sixteenth aspect of the present invention, it is possible to provide a polygon mirror scanner device capable of more reliably achieving the effect obtained by the fifth or sixth aspect.

[Brief description of the drawings]

FIG. 1 is a sectional view of a polygon mirror scanner device according to the present embodiment.

FIG. 2 is an exploded perspective view of a rotor in the polygon mirror scanner device of FIG.

FIG. 3 is a sectional view of a rotor according to a first embodiment of the present invention.

FIG. 4 is a sectional view of a rotor according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a rotor according to a third embodiment of the present invention.

FIG. 6 is a view showing a spiral groove according to the present invention.

FIG. 7 is a sectional view of a rotor according to a fourth embodiment of the present invention.

FIG. 8 is a sectional view of a rotor according to a fifth embodiment of the present invention.

FIG. 9 is a sectional view of a rotor according to a sixth embodiment of the present invention.

FIG. 10 shows a herringbone groove according to the present invention.

FIG. 11 is a sectional view of a rotor according to a seventh embodiment of the present invention.

FIG. 12 is a sectional view of a rotor according to an eighth embodiment of the present invention.

FIG. 13 is a sectional view of a rotor according to a ninth embodiment according to the present invention.

FIG. 14 is a sectional view showing a main part when the rotor of the seventh embodiment in FIG. 11 is used in the polygon mirror scanner device in FIG. 1;

FIG. 15 is a sectional view showing a main part when the rotor of the tenth embodiment in FIG. 16 is used in the polygon mirror scanner device in FIG. 1;

FIG. 16 is a sectional view of a rotor according to a tenth embodiment according to the present invention.

FIG. 17 is a sectional view of a rotor in an eleventh embodiment according to the present invention.

FIG. 18 is a sectional view of a rotor according to a twelfth embodiment of the present invention.

FIG. 19 is a diagram showing a rotator of a conventional polygon mirror scanner device.

FIG. 20 is a diagram showing a bearing device that supports a rotating shaft of a rotor in a conventional polygon mirror scanner device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mirror rotor 1a Side surface part 1e Spiral groove 1f Herringbone groove 2 Magnet 3 Rotation shaft 4 Radial bearing 5 Stator yoke 6 Winding coil 7 Thrust bearing

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideki Konno 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd. (72) Inventor Noriyuki Kadowaki 3F, Shinmei-do, Nakamaki, Shibata-cho, Shibata-gun, Miyagi Prefecture 1 (72) Inventor Makoto Endo 3-1 Shinmei-do, Nakaname, Shimada-cho, Shibata-cho, Miyagi Prefecture 2F045 AA14 AA15 AA24 AA25 AA43 AA49 3J011 AA07 BA02 BA04 BA08 CA03 JA02 KA02 KA03 MA02 MA24 5H605 AA03 BB03 EB03 EB06 EB28

Claims (16)

[Claims] 1. A rotating device comprising: a rotation center fixed to a rotating body; and a main body having an engaging portion engaged with the rotation center and rotatably supporting the rotating body. A lubricating liquid filled in a gap between the rotation center portion and the engaging portion; and pressure generating means for applying pressure from an open end side of the gap so that the lubricating liquid is maintained in the gap. Rotating device. 2. The rotating device according to claim 1, wherein the intensity of the pressure generated by the pressure generating means is smaller than the intensity of a magnetic force generated by a magnet for rotating the rotating body. 3. The pressure generating means is a spiral groove which is exposed in a space communicating with the gap and is formed in a top surface of a center hole concentric with a rotation center portion of the back surface of the rotating body. The rotating device according to claim 1, wherein 4. The pressure generating means is a herringbone groove which is exposed in a space communicating with the gap and is formed on a side surface of a center hole concentric with a rotation center portion of the back surface of the rotating body. The rotating device according to claim 1, wherein 5. The rotating device according to claim 3, wherein an outer peripheral surface of the stator yoke is disposed so as to face a side surface in the center hole. 6. The pressure generating means is an annular groove exposed in a space communicating with the gap and formed in a circumferential direction on a back surface of the rotating body facing the outer periphery of the rotation center. The rotating device according to claim 1, wherein 7. The pressure generating means is an annular groove that is exposed in a space that communicates with the gap and that is formed in a circumferential direction on the back surface of the rotating body that faces the inner circumference of the rotation center portion. The rotating device according to claim 1, wherein 8. The rotating device according to claim 5, wherein a plurality of the annular grooves are formed in the axial direction. 9. A rotation center fixed to a rotating polygon mirror having a plurality of reflection surfaces on a side surface and engaged with the rotation center to rotatably support the polygon mirror and the rotation center. A polygon mirror scanner device comprising: a main body having an engagement portion, wherein the lubricant is filled in a gap between the rotation center portion and the engagement portion, and the lubricant is maintained in the gap. And a pressure generating means for applying pressure from the open end side of the gap. 10. The polygon according to claim 9, wherein the intensity of the pressure generated by said pressure generating means is smaller than the intensity of a magnetic force generated by a magnet for rotating said polygon mirror rotating body. Mirror scanner device. 11. The pressure generating means is a spiral groove which is exposed in a space communicating with the gap and is formed in a top surface of a center hole concentric with a rotation center of the back surface of the polygon mirror. The polygon mirror scanner device according to claim 9, wherein 12. The pressure generating means is a herringbone groove which is exposed in a space communicating with the gap and is formed on a side surface of a center hole concentric with a rotation center of the back surface of the polygon mirror. The polygon mirror scanner device according to claim 9, wherein 13. The polygon mirror scanner device according to claim 11, wherein an outer peripheral surface of the stator yoke is disposed so as to face a side surface in the center hole. 14. The pressure generating means is an annular groove exposed in a space communicating with the gap and formed in a circumferential direction on a surface of the back surface of the polygon mirror facing the outer periphery of the rotation center portion. The polygon mirror scanner device according to claim 9, wherein: 15. The pressure generating means is an annular groove exposed in a space communicating with the gap and formed on a surface of the back surface of the polygon mirror facing the inner periphery of the rotation center. The polygon mirror scanner device according to claim 9, wherein 16. The polygon mirror scanner device according to claim 13, wherein a plurality of said annular grooves are formed in an axial direction.