JP2002106566A - Hydrodynamic bearing device, rotary device and deflection scanning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent trouble due to oil leakage from a bearing clearance. SOLUTION: A shaft 1 integrated with a rotary polygonal mirror 11 is fit rotatably into a bearing hole of a sleeve 2, and oil for generating hydrodynamic pressure is filled into the bearing clearance. Because the entire device is located slantwise at a slant angle θ against the horizontal, oil in the bearing clearance flows always toward outer surface of the sleeve 2 in slant direction. In order to collect such leaked oil, an outer groove 2d is provided on the outer surface in slant direction of the sleeve 2 for collecting the oil and a ring 6 is attached to surround the outside of the sleeve 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dynamic pressure bearing device, a rotating device and a deflection scanning device used for a scanner optical system of a laser printer or a bar code reader.

[0002]

2. Description of the Related Art In a laser printer or a bar code reader, a scanner optical system for scanning a photoreceptor with a laser beam is mounted on a bearing for supporting a rotating polygon mirror rotating at a high speed so that a stable and smooth rotation can be obtained. Use pressure bearings. Also, in information storage devices such as optical disks and magnetic disks, dynamic pressure bearings have been widely used as bearings for supporting disks rotating at high speed.

FIG. 12 shows a main part of a conventional deflection scanning apparatus, which comprises a sleeve 102 which rotatably supports a shaft 101 in a bearing hole, and which is fixed to a lower end of the sleeve 102 and is fixed to the sleeve 102. A fixing plate 103 for closing a bearing hole, a thrust plate 104 supported by the fixing plate 103, and a sleeve 1
No. 02 has oil filled between the inner surface of the bearing hole and the outer surface of the shaft 101 and between the thrust plate 104 and the end surface of the shaft 101, and the end surface of the shaft 101 is formed of a material having low frictional resistance. A thrust bearing is constituted together with the thrust plate 104.

A flange member 110 is fixed above the shaft 101 and has a rotating polygon mirror 111 having a reflecting surface 111a.
Is placed on the flange member 110 and is pressed by the pressing spring, so that the flange member 110 and the rotor 112
And are integrally connected.

The rotor 112 has a permanent magnet 112a and a yoke 112b for supporting the same. A circuit board 114 is fixed to the sleeve 102, and a stator core 113 b of the stator 113 is supported upright on the circuit board 114.
Stator coil 11 wound around stator core 113b
3a is opposed to the permanent magnet 112a of the rotor 112, and both constitute a motor for rotatingly driving the rotary polygon mirror 111.

[0006] An oil reservoir 102a is provided at the upper end of the bearing hole of the sleeve 102, thereby ensuring redundancy against a runaway of the oil level in the bearing hole. Also, large-diameter portions are provided at the lower end portion and the center portion of the sleeve 102, these constitute escape portions 102b and 102c for reducing the dynamic pressure loss of the oil, and the oil sump 102a at the upper end and the escape portion at the center are formed. Herringbone-shaped dynamic pressure generating grooves 105a and 105b are provided between the central relief portion 102c and the central relief portion 102c and the lower relief portion 102b, respectively.
Are formed.

[0007] A spiral groove is formed on the upper surface of the thrust plate 104, and the upper end of the shaft 101 is provided with a sleeve 102.
Projecting upward from the bearing hole of the rotary polygon mirror 111 by the flange member 110.

In the thus configured dynamic pressure bearing device, when the shaft 101 rotates, dynamic pressure is generated in the oil by the action of the dynamic pressure generating grooves 105a and 105b provided in the bearing hole of the sleeve 102, and the shaft 101 It rotates without contact with the bearing hole of the sleeve 102. Also in the thrust direction, dynamic pressure is generated by the action of the spiral groove provided in the thrust plate 104, and the shaft 101 is supported in a floating state.

[0009]

However, according to the above prior art, when a fluid such as oil is used as a working fluid of the dynamic pressure bearing, an operation is required when the sleeve 102 and the shaft 101 are fitted in the initial assembly. Air may be entrained inside the fluid. The trapped air escapes 10
If the device stays in a large amount in the 2b, 102c, the temperature of the device rises due to rotation, or when the device is installed in a low-pressure place such as a high altitude, air enters from the escape portions 102b, 102c into the bearing gap of the dynamic pressure bearing. Bubbly air may carry oil with it when it escapes through the bearing opening.

In a repeated use state such as start / stop of the apparatus, oil leaks from the bearing opening as described above, and the oil flows through the flange member 110 and the yoke 1.
There is an unsolved problem that the particles are scattered by the centrifugal force accompanying these rotations along the 12b and cause malfunction of the device.

For this reason, an oil leakage prevention portion is attached to the shaft (see Japanese Patent Application Laid-Open No. Hei 6-31696) or an oil absorbing sheet that absorbs the leaked oil is interposed (see Japanese Patent Application Laid-Open No. Hei 8-75011). However, there still remain problems such as an insufficient effect of preventing leakage and a complicated assembling process.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned unresolved problems of the prior art. By providing a collecting means for collecting oil on the outside of a sleeve, the leaked oil can be removed from the device. It is an object of the present invention to provide a dynamic pressure bearing device, a rotating device, and a deflection scanning device which do not hinder the operation of the dynamic pressure bearing and are excellent in stability.

[0013]

In order to achieve the above object, a hydrodynamic bearing device according to the present invention comprises: a rotating shaft inclined in a predetermined inclination direction; a sleeve rotatably supporting the rotating shaft; A working fluid for generating dynamic pressure filled in a bearing gap between the sleeve and the rotary shaft; and a collecting means for collecting leakage of the working fluid on an outer surface of the sleeve in the inclined direction. Features.

Preferably, the collecting means is constituted by an outer groove provided on the outer surface of the sleeve and a cylindrical member covering the sleeve.

Preferably, the upper end of the outer groove of the sleeve is chamfered.

It is preferable that a catching member for catching leakage of the working fluid is provided in the outer groove of the sleeve.

[0017] A cylindrical member for covering the sleeve may be provided, and the collecting means may be constituted by a projection of the cylindrical member.

It is preferable that a catching member for catching the leakage of the working fluid is provided at the projecting portion of the cylindrical member.

Preferably, the upper portion of the cylindrical member is disposed so as to protrude from the upper end of the sleeve.

The inner surface of the sleeve may be provided with an inner groove for guiding the leakage of the working fluid toward the collecting means.

[0021]

When the rotating shaft of the hydrodynamic bearing device is disposed at an inclination, when the working fluid in the bearing gap leaks from the opening of the sleeve, it flows toward the outer surface in the inclination direction of the sleeve. I do. Therefore, a collecting means for collecting the leakage of the working fluid is provided on the outer surface in the inclined direction of the sleeve to prevent the leakage of the working fluid from scattering to peripheral devices.

If the collecting means is provided with a capturing member for absorbing and capturing the leakage of the working fluid, it is possible to prevent the working fluid collected in the collecting means from flowing out again.

If the sleeve is provided with an inner groove or the upper end of the sleeve is chamfered to guide the leakage of the working fluid toward the collecting means, the leakage of the working fluid can be reliably collected.

[0024]

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

FIG. 1 shows a rotary device using the dynamic pressure bearing device according to the first embodiment. This rotary device has a reflecting surface 11a for deflecting and scanning a light beam in a deflection scanning device described later. It has a motor for rotating and driving the polygon mirror 11.

A shaft 1, which is a rotating shaft, has a rotor 12 comprising a permanent magnet 12a and a yoke 12b via a flange member 10.
The sleeve 2 is integrated with the rotating polygon mirror 11, and the sleeve 2 is integrally connected to the stator 13 including the stator coil 13a and the stator core 13b.

The stator core 13b has a multi-pole pole shoe, and a stator coil 13a is wound around each pole shoe. The energization is sequentially switched according to the rotational position of the multi-magnetized permanent magnet 12a, and a rotational force is generated between the rotor 12 and the stator 13.

The stator core 13b around which the stator coil 13a is wound is fixed to a circuit board 14 together with circuit components constituting a drive circuit.
It is integrated with. Such a rotor section and a stator section are separately produced, and a total set as a motor is performed. At this time, a predetermined amount of oil, which is a working fluid for generating a dynamic pressure, is injected into the sleeve 2 by an oil injection device, and then the shaft 1 is inserted into the sleeve 2 to complete the motor.

As described above, the bearing portion of the motor includes a sleeve 2 for rotatably supporting the shaft 1 in the bearing hole, a fixed plate 3 fixed to the lower end of the sleeve 2 and closing the bearing hole, and Thrust plate 4 supported by
Between the inner surface of the bearing hole and the outer surface of the shaft 1 or the thrust plate 4
And a dynamic pressure bearing device constituted by oil filled between the end faces of the shaft 1.

An oil reservoir 2a is provided at the upper end of the bearing hole of the sleeve 2, and the lower end and the central portion are escape portions 2b and 2c formed by large-diameter portions, respectively. Herringbone-shaped dynamic pressure generating grooves 5a and 5b are formed between the portions 2c and between the central relief portion 2c and the lower relief portion 2b, respectively. A spiral groove is formed on the upper surface of the thrust plate 4.

In the thus configured dynamic pressure bearing device, when the shaft 1 rotates, a dynamic pressure is generated in the oil by the action of the dynamic pressure generating grooves 5a and 5b provided in the bearing hole of the sleeve 2.
The shaft 1 rotates without contact with the bearing hole of the sleeve 2. Also in the thrust direction, dynamic pressure is generated by the action of the spiral groove provided in the thrust plate 4, and the shaft 1 is supported in a floating state.

When this apparatus is attached to a housing (stay) that supports a scanner optical system of a deflection scanning apparatus described later, it is arranged at an inclination angle θ in a predetermined inclination direction. The inclination angle θ is determined by the size of the scanner optical system and the machine for each model, and is arbitrarily set within an angle of 0 ° to 90 ° with respect to the horizontal plane.

In the rotating device arranged at such an inclination angle θ, the oil for generating the dynamic pressure always leaks from the fixed position of the sleeve opening in the inclined direction of the sleeve. An outer groove 2d for collecting oil leakage is provided on the side surface. Usually, the outer groove 2d is formed by cutting with an end mill or the like, but in some cases, it can be formed by a method such as forging or etching by chemical means.

A cylindrical ring 6 which is a cylindrical member is attached to the outer peripheral surface of the sleeve 2 so as to surround the outer groove 2 d, and collects oil leaking from the upper end opening of the sleeve 2. The material of the ring 6 is a metal, a resin, or the like.

That is, the cylindrical ring 6 and the outer groove 2d formed on the outer peripheral surface of the sleeve 2 constitute means for collecting oil leaking from the bearing gap of the sleeve 2. As shown in FIG. 2, it is only necessary to fit the ring 6 axially from above the sleeve 2.

When the ring 6 is made of a metal material, the inner diameter of the ring 6 may be made slightly smaller than the outer shape of the upper part of the sleeve 2 and assembled by shrink fitting.

If the ring 6 is made of a resin material, the lower surface of the ring 6 may be fixed while sealing along the circumference after press-fitting or dropping.

The sleeve 2 constructed as described above
Is fixed to the circuit board 14, the leakage of the oil flowing out from the opening of the sleeve 2 inclined at the inclination angle θ is
It must be remembered that the outer groove 2d is arranged so as to be located on the outer surface in the inclined direction, which is the fixed position where it flows out under gravity.

When the oil leaks from the opening of the sleeve 2 due to the cause described in the conventional example, the surface tension of the oil acting between the opening of the sleeve 2 and the shaft 1 is broken, and the oil cannot be retained. Oil starts to leak, but since the rotating device is entirely inclined at the inclination angle θ, the leaked oil flows under the influence of gravity and flows in the direction of inclination of the device, that is, to the right in FIG. Then, since there is a collecting means formed by the ring 6 and the outer groove 2d formed on the outer peripheral surface of the sleeve 2, oil leakage is collected here. Oil does not flow out of the bearing and contaminate peripheral devices as in the conventional example, and there is no malfunction.

The upper part of the ring 6 has a sleeve 2.
To protrude upward from the upper end. As a result, it is possible to prevent oil from leaking from other portions of the opening of the sleeve 2.

As shown in FIG. 3, an inner groove 2e may be formed on the inner surface of the sleeve 2, that is, on the inner diameter side of the opening so as to face the outer groove 2d. The oil adhering to the opening of the sleeve 2 is more likely to collect in the inner groove 2e due to surface tension, and is more likely to flow toward the outer groove 2d due to the influence of gravity due to the inclination angle θ.

As described above, the oil collected in the outer groove 2d is guided to collect in the outer groove 2d with the shortest path, so that the oil can be collected reliably.

As shown in FIG. 4, the upper end of the outer groove 2d of the sleeve 2 is rounded by C chamfering (see FIG. 4A) or R chamfering (see FIG. 4B). This prevents the oil from adhering to the upper end of the sleeve 2 and staying there, so that the oil can be collected smoothly.

In particular, as shown in FIG.
In the state close to °, a bent portion 6a is provided at the upper end of the ring 6 so that the inflow port is narrowed (see FIG. 5 (a)) so that the oil after collection does not flow out again. An oil catching member 7, which is a cotton-like or sponge-like catching member, may be provided therein (see FIG. 5B).

According to the present embodiment, it is possible to effectively collect oil that has leaked out from the opening of the sleeve in a repeated use state such as starting / stopping a rotating device that rotationally drives the rotating polygon mirror. As a result, it is possible to prevent oil from splashing, and to avoid contamination of the circuit board due to oil leaks and other malfunctions of equipment, and it is inexpensive and has excellent durability without using expensive members such as oil absorption sheets. In addition, a highly-functional dynamic pressure bearing device, rotating device and deflection scanning device can be realized.

FIG. 6 shows a rotating device using the hydrodynamic bearing device according to the second embodiment.
22, a fixing plate 23 fixed to the lower end of the sleeve 22 to seal the bearing hole, a thrust plate 24 supported by the sleeve 22, and an inner surface of the bearing hole of the sleeve 22. And the outer surface of the shaft 21 and between the thrust plate 24 and the end surface of the shaft 21.

An oil reservoir 22a is provided at the upper end of the bearing hole of the sleeve 22, and the lower end and the central portion are escape portions 22b and 22c formed by large-diameter portions, respectively. Herringbone-shaped dynamic pressure generating grooves 25a and 25b are formed between the portions 22c and between the central relief portion 22c and the lower relief portion 22b, respectively. A spiral groove is formed on the upper surface of the thrust plate 24.

In the thus configured dynamic pressure bearing device, when the shaft 21 rotates, a dynamic pressure is generated in the oil by the action of the dynamic pressure generating grooves 25a and 25b provided in the bearing hole of the sleeve 22. It rotates without contact with the bearing hole of the sleeve 22. Also in the thrust direction, dynamic pressure is generated by the action of the spiral groove provided in the thrust plate 24, and the shaft 21 is supported in a floating state.

The rotating polygon mirror 11, which is fixed to the shaft 21 via the flange member 10, the rotor 12 including the permanent magnet 12a and the yoke 12b, and the stator coil 13a
Since the stator 13, the circuit board 14 and the like comprising the stator core 13b are the same as those in the first embodiment, they are denoted by the same reference numerals and description thereof is omitted.

When the above-described rotating device is attached to a housing (stay) that supports the scanner optical system of the deflection scanning device, the rotating device is disposed at an angle of inclination θ in a predetermined inclination direction. The inclination angle θ is determined by the size of the scanner optical system and the machine for each model, and is arbitrarily set within an angle of 0 ° to 90 ° with respect to the horizontal plane.

In the rotating device thus inclined at the inclination angle θ, the oil, which is the working fluid for generating the dynamic pressure, always moves from the fixed position of the sleeve opening toward the outer surface in the inclination direction of the sleeve. For leakage, a ring 26 which is a cylindrical member surrounding the outer peripheral surface of the sleeve is provided, and a protruding portion 26a is formed on the ring 26, and this is disposed on the outer surface of the sleeve 22 at the fixed position.

A cylindrical ring 2 is formed on the outer peripheral surface of the sleeve 22.
The oil leaking from the upper end opening of the sleeve 22 is collected in a space inside the protrusion 26 a of the ring 26. The material of the ring 26 is metal, resin, or the like.

That is, the cylindrical ring 26 constitutes a means for collecting oil leaking from the bearing gap of the sleeve 22 by a space formed between the projecting portion 26a and the outer peripheral surface of the sleeve 22. The assembly simply requires the ring 26 to be fitted axially from above the sleeve 22, as shown in FIG.

When the ring 26 is made of a metal material, the inner diameter of the ring 26 may be made slightly smaller than the outer shape of the upper part of the sleeve 22 and assembled by shrink fitting.

If the ring 26 is made of a resin material,
After press-fitting or dropping, the lower surface of the ring 26 may be fixed while sealing along the circumference.

The sleeve 2 constructed as described above
In the process of fixing 2 to the circuit board 14, it must be remembered that the protrusion 26a of the ring 26 is located at a fixed position where oil leaks from the opening of the sleeve 22 and flows out due to gravity. .

When the oil leaks from the opening of the sleeve 22 due to the cause described in the conventional example, the surface tension of the oil acting between the opening of the sleeve 22 and the shaft 21 is broken, and the oil cannot be retained. Oil starts to leak, but since this rotating device is arranged at an angle of inclination θ as a whole,
The leaked oil flows under the influence of gravity to the right side in FIG. Then, the protruding portion 26 of the ring 26
The oil is collected here because there is an oil collecting means formed by a. As in the conventional example, there is no possibility that the oil leaks out to other parts and contaminates peripheral devices, thereby causing malfunctions.

The ring 26 is long so that its upper part protrudes upward from the opening of the sleeve 22.
As a result, it is possible to prevent oil from leaking from other portions of the opening of the sleeve 22.

As shown in FIG. 8, an inner groove 22e may be formed on the inner surface of the sleeve 22 on the inner diameter side of the opening so as to face the protruding portion 26a of the ring 26. The oil adhering to the opening of the sleeve 22 is more likely to collect in the inner groove 22e due to surface tension, and is more likely to flow out toward the protrusion 26a of the ring 26 due to the influence of gravity due to the inclination angle θ.

As described above, the oil collected by the protruding portion 26a of the ring 26 is guided to collect in the shortest path, so that the oil can be collected reliably.

As shown in FIG. 9, if the upper end of the sleeve 22 is rounded by C chamfering (see FIG. 9A) or R chamfering (see FIG. 9B), Oil can be prevented from staying there while being attached to the upper end of the sleeve 22, and the oil can be collected smoothly.

In particular, as shown in FIG.
In the case where the angle is close to 0 °, a bent portion 26b is provided at the upper end of the ring 26 so that the inflow port is narrowed (see FIG. 10 (a)) so that the oil after collection does not flow again. A cotton or sponge-like oil capturing member 27 may be provided in the capturing means (see FIG. 10B).

In this way, in repeated use states such as starting / stopping of the rotating device, the oil that has leaked out from the opening of the sleeve is effectively collected, thereby preventing the oil from being scattered. Inexpensive and high-performance hydrodynamic bearing device, rotating device, and deflection scanning device without using expensive members such as oil absorption sheets, so as to avoid contamination of the circuit board due to leakage and other malfunctions of equipment. Can be realized.

FIG. 11 shows a main part of the deflection scanning device, which comprises a light source 51 for generating a light beam (light flux) such as a laser beam and the like, and the light beam is reflected on a reflecting surface 1 of a rotary polygon mirror 11.
A cylindrical lens 51a for linearly condensing the light beam on the rotary drum 11a, and deflects and scans the light beam by the rotation of the rotary polygon mirror 11; An image is formed on 53. The imaging lens system 52 includes a spherical lens 52a, a toric lens 52b, and the like, and has a so-called fθ function of correcting a scanning speed and the like of a point image formed on the photoconductor 53.

When the rotating polygon mirror 11 is rotated by the motor, its reflecting surface 11a rotates at a constant speed around the axis of the rotating polygon mirror 11. As described above, the angle between the optical path of the light beam generated from the light source 51 and collected by the cylindrical lens 51a and the normal to the reflecting surface 11a of the rotary polygon mirror 11, that is, the incident angle of the light beam on the reflecting surface 11a Changes over time with the rotation of the rotating polygon mirror 11, and similarly, the reflection angle also changes. Therefore, the point image formed by condensing the light beam on the photoreceptor 53 is in the axial direction (main scanning direction) of the rotating drum. (Scan).

The imaging lens system 52 focuses the light beam reflected by the rotary polygon mirror 11 on the photosensitive member 53 into a point image having a predetermined spot shape, and scans the point image in the main scanning direction. Is designed to keep the speed constant.

The point image formed on the photoreceptor 53 is formed by the main scanning by the rotation of the rotary polygon mirror 11 and the sub-scanning by the rotation of the rotating drum having the photoreceptor 53 around its axis. Form a latent image.

Around the photosensitive member 53, a charging device for uniformly charging the surface of the photosensitive member 53, and a charging device for visualizing an electrostatic latent image formed on the surface of the photosensitive member 53 into a toner image. A developing device, a transfer device (not shown) for transferring the toner image to recording paper, and the like are arranged, and recording information by a light beam generated from the light source 51 is printed on recording paper or the like.

The detection mirror 54 reflects the light beam on the upstream side in the main scanning direction from the optical path of the light beam incident on the write start position of the recording information on the surface of the photoreceptor 53, and the light receiving element 55 having a photodiode or the like To the light receiving surface of The light receiving element 55 outputs a scanning start signal for detecting a scanning start position (write start position) when the light receiving surface is irradiated with the light beam.

The light source 51 generates a light beam corresponding to a signal given from a processing circuit for processing information from the host computer. The signal given to the light source 51 corresponds to information to be written on the photoconductor 53, and the processing circuit represents information corresponding to one scanning line which is a locus formed by a point image formed on the surface of the photoconductor 53. The signal is given to the light source 51 as one unit. This information signal is transmitted in synchronization with a scanning start signal given from the light receiving element 55.

The rotating polygon mirror 11, the imaging lens system 52
Are housed in the optical box 50, and the light source 51 and the like are attached to the side wall of the optical box 50. A rotating polygon mirror 11 in an optical box 50,
After the imaging lens system 52 and the like are assembled, a lid (not shown) is attached to the upper opening of the optical box 50.

[0072]

Since the present invention is configured as described above, the following effects can be obtained.

By collecting the oil leaking from the bearing gap on the outer surface of the sleeve, it is possible to prevent the leaked oil from contaminating the circuit board and the like and hindering the operation of peripheral devices.

As a result, it is possible to realize a dynamic bearing device having excellent stability that can maintain high bearing performance for a long time.

By using such a dynamic pressure bearing device,
This can contribute to higher performance and durability of a rotating device or a deflection scanning device that rotationally drives a rotary polygon mirror or the like.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment.

FIG. 2 shows a method of assembling the sleeve and the ring of FIG. 1;

FIG. 3 is a diagram showing a first modification of the first embodiment.

FIG. 4 is a diagram showing second and third modifications of the first embodiment.

FIG. 5 is a diagram showing fourth and fifth modifications of the first embodiment.

FIG. 6 is a schematic cross-sectional view showing a second embodiment.

FIG. 7 shows a method of assembling the sleeve and the ring of FIG. 6;

FIG. 8 is a diagram showing a first modification of the second embodiment.

FIG. 9 is a diagram illustrating second and third modifications of the second embodiment.

FIG. 10 is a diagram showing fourth and fifth modifications of the second embodiment.

FIG. 11 is a diagram illustrating the entire deflection scanning device.

FIG. 12 is a diagram showing a conventional example.

[Explanation of symbols]

 1, 21 Shaft 2, 22 Sleeve 2a, 22a Oil pool 2b, 2c, 22b, 22c Escape portion 2d Outer groove 2e, 22e Inner groove 3, 23 Fixing plate 4, 24 Thrust plate 5a, 5b, 25a, 25b Dynamic pressure generation Groove 6, 26 Ring 7, 27 Oil catching member 10 Flange member 11 Rotating polygon mirror 11a Reflecting surface 12 Rotor 13 Stator 14 Circuit board 26a Projection

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 5/16 H02K 7/08 A 5H607 7/08 B41J 3/00 D H04N 1/113 H04N 1/04 104A (72) Inventor Masayoshi Asami 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Ichiro Maekawa 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Invention Person Mikio Nakasugi 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Nobuo Nakajima 3-30-2 Shimomaruko 3-chome, Ota-ku, Tokyo Inside Canon Inc. (72) Michihiro Kugioka, Inventor 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (72) Inventor Hiromasa Masuda 2-4-1-19 Nakane, Meguro-ku, Tokyo Canon F term (reference) in Seiki Co., Ltd. CC01 DD03 DD16 GG01 GG03 GG09 GG12 GG15 GG28

Claims (12)

[Claims] 1. A rotating shaft inclined in a predetermined inclination direction, a sleeve rotatably supporting the rotating shaft, and a working fluid for generating dynamic pressure filled in a bearing gap between the sleeve and the rotating shaft. And a collecting means for collecting leakage of the working fluid on an outer surface of the sleeve in the inclined direction. 2. The hydrodynamic bearing device according to claim 1, wherein the collecting means includes an outer groove provided on an outer surface of the sleeve, and a cylindrical member covering the sleeve. 3. The hydrodynamic bearing device according to claim 2, wherein the upper end of the outer groove of the sleeve is chamfered. 4. The hydrodynamic bearing device according to claim 2, wherein a catching member for catching leakage of the working fluid is provided in the outer groove of the sleeve. 5. The hydrodynamic bearing device according to claim 1, wherein a cylindrical member that covers the sleeve is provided, and the collecting means is constituted by a protrusion of the cylindrical member. 6. The hydrodynamic bearing device according to claim 5, wherein a catching member for catching leakage of the working fluid is provided at the projecting portion of the cylindrical member. 7. The hydrodynamic bearing device according to claim 5, wherein the upper end of the outer surface of the sleeve is chamfered. 8. The hydrodynamic bearing device according to claim 2, wherein an upper portion of the cylindrical member is disposed so as to protrude from an upper end of the sleeve. 9. The dynamic pressure according to claim 1, wherein an inner groove for guiding leakage of the working fluid toward the collecting means is provided on an inner surface of the sleeve. Bearing device. 10. A rotating device comprising a hydrodynamic bearing device according to claim 1, and a motor comprising a rotor and a stator which are respectively integrated with a rotating shaft and a sleeve of the hydrodynamic bearing device. 11. A deflection scanning device comprising the dynamic pressure bearing device according to claim 1, and a rotary polygon mirror rotatably supported by the dynamic pressure bearing device. 12. A deflection scanning device comprising: the rotation device according to claim 10; and a rotary polygon mirror driven to rotate by a motor of the rotation device.