JPH11183828A - Deflecting scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflecting scanner capable of remarkably improving characteristics such as the miniaturization of a device, the reduction of the cost and the improvement of performance by sharply reducing the axial direction dimensions of a driving part for a rotary polygon mirror and reducing the number of parts for fixing the rotary polygon mirror. SOLUTION: The deflecting scanner has a driving part provided with a flange member 11 to be rotatably engaged with a fixing member, a rotary polygon mirror 3 engaged and supported with/by the flange member 11 by an engaging part 140, a rotor 9 united with the flange member 11, and a stator 8 opposed to the rotor 9. The engaging part 14 of the mirror 3 with the flange part 11 has a shape for increasing an adhesive area with adhesives to adhere and fix the mirror 3 to the member 11 with adhesives on the engaging part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection scanning device used for an image forming apparatus such as a laser beam printer and a laser facsimile.

[0002]

2. Description of the Related Art FIG. 6 illustrates a general deflection scanning device used for an image forming apparatus such as a laser beam printer or a laser facsimile. This device uses a laser beam L0 generated from a light source unit 50 as a cylindrical beam. The light is condensed on a line on the reflection surface of the rotating polygon mirror 101 by the lens 51, and the light is deflected and scanned by the reflection of the rotating polygon mirror 101,
An image is formed on a photoreceptor on a rotating drum (not shown) via an image forming lens system 52. The imaging lens system 52 is a spherical lens 52
a, toric lens 52b, etc., and has a function of correcting distortion of a point image formed on the photoconductor.
A part of the deflected and scanned light beam is reflected by a reflection mirror 53.
The light is then introduced into the light receiving end of the optical fiber 54, converted into a scanning start signal, and transmitted to the light source unit 50.

Conventionally, a rotary polygon mirror of this type of deflection scanning apparatus and its driving unit are provided in a housing 7 as shown in FIG.
And a motor board 10 connected to the housing 7, a bearing 2d supported by the housing 7, and a shaft 2a rotatably supported by the bearing 2d, and fixed to a flange member 1 integral with the shaft 2a. Rotor 9 and substrate 10
The scanner motor 2 is constituted by a stator fixed to the scanner motor 2. The rotating polygon mirror 101 is positioned by the flange member 1, and the pressing plate 1 screwed around the upper end of the shaft 6a in the figure.
3. Pressed against the flange member 1 by the tightening washer 12 and the pressing spring 4, thereby being integrally connected to the rotor 9 and rotating together with the shaft 2a.

[0004]

However, according to the above-mentioned prior art, as described above, the pressing spring for pressing the rotary polygon mirror against the flange member has a rotary shaft or a cylindrical flange member integrated with the rotary shaft. It is assembled on the side,
For this purpose, the flange member and the rotating shaft have to protrude greatly above the rotary polygon mirror, and therefore, the flange member and the rotating shaft become extremely long. As a result, there is a problem in that the entire driving unit of the rotary polygon mirror becomes bulky, which hinders miniaturization of the deflection scanning device. In addition, many parts such as a holding plate, a tightening washer, and a pressing spring are required to fix the rotating polygon mirror, and a groove is required in the shaft to tighten the tightening washer to the shaft. There is also a problem in that wind loss and imbalance are increased due to the bulkiness and complicated shape of the rotating part. Further, there is a method of bonding the rotating polygon mirror with an adhesive or the like, but the conventional method has a problem in strength in order to cope with the recent increase in speed of the apparatus.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art, and to greatly reduce the axial dimension of a driving part of a rotary polygon mirror and to reduce the number of parts for fixing the rotary polygon mirror. It is an object of the present invention to provide a deflection scanning device which can greatly promote downsizing, low cost, high performance, and the like of the device.

[0006]

According to the present invention, in order to solve the above-mentioned problems, a deflection scanning device is constituted as follows. That is, the deflection scanning device of the present invention includes a flange member rotatably fitted to a fixed member, a rotary polygon mirror fitted and supported by the flange member at a fitting portion, and a rotor integrated with the flange member. And a deflection scanning device having a drive unit having a stator opposed thereto, wherein a fitting portion of the rotary polygon mirror with a flange member has a shape that increases an adhesive area by an adhesive, and the rotary polygon mirror is The fitting portion is bonded and fixed to the flange member with an adhesive. Further, in the deflection scanning device according to the present invention, the shape for increasing the bonding area of the adhesive in the fitting portion may be an outer peripheral surface of a fitting portion of the flange member for fitting and supporting the rotary polygon mirror, or the flange member. And is formed by a spiral groove provided on at least one of the inner peripheral surfaces of the fitting holes of the rotary polygonal mirror fitted and supported by the rotary polygon mirror. Further, in the deflection scanning device of the present invention, the shape for increasing the bonding area of the adhesive in the fitting portion may include: an outer peripheral surface of a fitting portion of the flange member for fitting and supporting the rotary polygon mirror; And a spiral groove provided on both surfaces of the rotary polygon mirror and the inner peripheral surface of the fitting hole of the rotary polygon mirror. Further, in the deflection scanning device according to the present invention, the spiral groove may include:
The angle of the spiral groove is formed at an angle that is not equal between the outer peripheral surface of the flange member and the inner peripheral surface of the rotary polygon mirror. Further, the deflection scanning device of the present invention is characterized in that the spiral groove is formed such that the direction of the spiral groove is away from the contact surface of the rotary polygon mirror with respect to the rotation direction of the rotary polygon mirror. I have. Further, in the deflection scanning device according to the present invention, the shape for increasing the adhesive area of the adhesive in the fitting portion may be an outer peripheral surface of a fitting portion of the flange member for fitting and supporting the rotary polygon mirror, or the flange member. That is formed by a shallow groove in the axial direction or in both the axial and circumferential directions provided on at least one of the inner peripheral surfaces of the fitting holes of the rotary polygon mirror fitted and supported by Features. Further, in the deflection scanning device according to the present invention, the shape for increasing the bonding area of the fitting portion by the adhesive is at least one of the inner peripheral surfaces of the fitting holes of the rotary polygon mirror fitted and supported by the flange member. It is characterized by being formed by a taper that extends upward provided in the portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above construction, when the stator is excited, the rotor and the rotary polygon mirror rotate integrally, and the rotary polygon mirror is rotated by the outer periphery of the fitting portion of the flange member or the rotary polygon mirror. The conventional holding spring, holding plate, and tightening washer are firmly attached to the rotating member by the adhesive interposed between the spiral groove provided on at least one of the inner circumferences of the mirror and the fitting gap and the fitting gap. In addition to eliminating the need for parts such as these, the flange member does not need to protrude significantly above the rotary polygon mirror for assembling the presser spring, and there is no need to form a groove for assembling the tightening washer. Accordingly, it is possible to reduce the axial dimension of the rotating body composed of the rotating polygon mirror and the flange member, to reduce the size of the driving unit, and to reduce inertia and windage loss. This promotes downsizing of the entire device, and reduces whirling vibrations of the rotating polygon mirror, thereby greatly improving the optical characteristics.
Parts costs and processing costs can be reduced, and the cost of the apparatus can be reduced.

[0008]

Embodiments of the present invention will be described below. [Embodiment 1] FIG. 1 shows a main part of a deflection scanning apparatus according to Embodiment 1 of the present invention. Members similar to those of the conventional example are denoted by the same reference numerals. As shown in FIG. 1, the optical deflector in this embodiment has a bearing 6b supported by a housing 7 and a rotating shaft 6a rotatably supported by the bearing 6b. In the present embodiment, a cross-sectional view in the case of using a bearing of a direct bearing system is shown, but a normal ball structure, a fluid bearing or a sliding bearing may be used, and the present invention does not limit the structure of the bearing. . A coil 15 is wound around a stator core 8 fixed to the substrate 10, and a rotary polygon mirror 3 fixed so as to rotate together with the shaft 6a is fitted on the upper side.

In such a configuration, the rotary polygon mirror 3 has a spiral groove 13 in the inner diameter as shown in FIG.
It is fixed to the flange member 11 integrated with the rotor by interposing an adhesive in the fitting gap 14 and the spiral groove 13. The spiral groove 13 is a lathe or ball sizing,
It is provided by means such as etching. The spiral groove 13 has the effect of increasing the bonding area of the adhesive and increasing the bonding strength, and the rotary polygon mirror 3 can be more firmly fixed to the flange member 11 by the spiral groove 13.

Further, the spiral groove 13 is provided with a rotary polygon mirror so that a force acts in a direction in which the rotary polygon mirror 3 is pressed against the flange member 11 due to inertia or windage of the rotary polygon mirror 3 at the time of starting rotation and steady rotation of the driving unit. 3 is provided in a direction that travels from the upper side to the lower side in a direction opposite to the traveling direction. In this embodiment, the adhesive is -30 to 80C.
The type is not particularly limited as long as it is a type in which mechanical properties such as toughness and hardness are balanced in a low temperature environment. For example, a thermosetting resin adhesive or an anaerobic curable adhesive is used. In the present embodiment, the rotating polygon mirror 3 is used.
The spiral groove 13 is provided on the inner diameter of the flange member 11, but the spiral groove 13 may be provided on the outer periphery of the flange member 11 on the rotating member side, or may be provided on both sides. In this embodiment, the rotary polygon mirror 3 is fitted to the upper projecting portion of the flange member 11,
It may be directly fitted with the shaft 6a.

With the above-described configuration, it is not necessary to fix a pressing spring or the like to the flange member 11 or the shaft 6a, and it is possible to reduce the axial dimension of the rotating body including the rotary polygon mirror 3 and the flange member. The drive unit can be miniaturized, and inertia and windage loss can be reduced. In addition, whirling vibrations of the rotary polygon mirror can be reduced, so that optical characteristics can be significantly improved, component costs can be reduced, and the cost of the apparatus can be reduced.

[Embodiment 2] FIG. 2 shows a main part of a deflection scanning apparatus according to Embodiment 2 of the present invention, in which spiral grooves 13 are provided on both outer and inner peripheral surfaces of a fitting portion. is there.
The bonding area is increased and the bonding strength is further increased as compared with the first embodiment. At this time, if the angles of the spiral grooves 13 are the same, the spiral grooves 13 face each other depending on the positional relationship between the rotary polygon mirror 3 and the flange member and the number of grooves, and the fitting gap 14 is widened only at that portion, so that the bonding is performed. This causes uncuring and stress concentration of the agent, resulting in a decrease in adhesive strength. Then the spiral groove 13
By not making the angles equal, it is possible to reduce the portion where the fitting gap is wide and increase the adhesive strength.

Third Embodiment FIG. 3 shows a main part of a deflection scanning apparatus according to a third embodiment of the present invention. In place of the spiral groove 13, an outer periphery of a fitting portion of a flange member fitted with a rotary polygon mirror. Alternatively, a shallow groove 15 is provided in at least one surface of the inner circumference of the inner diameter of the rotating polygonal mirror in the axial direction, or in both the axial direction and the circumferential direction, and an adhesive is interposed in the fitting gap 14 and the groove 15 so that the rotor and the rotor are separated. It is fixed to the integrated flange member 11. This groove is also processed by a method such as lathe, etching and grinding. This groove can also increase the bonding area, increase the bonding strength, and achieve the same effect. In this embodiment, the groove is provided on the inner diameter side of the rotary polygon mirror 1. However, the same effect can be obtained by providing the groove on the flange member side. Further, it is more effective to form grooves having different directions in both. Also, by adopting the groove shape as described above as a shape to increase the bonding area,
The dimensional accuracy can be secured without roughening the entire fitting surface.

[Embodiment 4] FIG. 4 shows a main part of a deflection scanning device according to Embodiment 4 of the present invention. The same effect can be obtained by interposing an adhesive between the tapered portion 17 and the fitting gap 14. Also, an adhesive having high viscosity and poor permeability can be used, and an energy ray can be irradiated directly from above the rotary polygon mirror 3 to the bonding portion. Yes, the selection range of adhesives is expanded.

[0015]

As described above, according to the present invention, the rotary polygon mirror can be firmly fixed to the flange member at the fitting portion by bonding, so that the axial dimension of the drive section of the rotary polygon mirror can be reduced and the drive section can be reduced. Miniaturization, vibration prevention, inertia reduction,
It is possible to greatly promote a reduction in parts cost and the like, whereby a small-sized, high-performance and low-cost deflection scanning device can be realized. Therefore, with the deflection scanning device of the present invention, it is possible to reduce the size, performance, and cost of the image forming apparatus.

[Brief description of the drawings]

FIG. 1 is a schematic view of a deflection scanning device according to a first embodiment;
(A) is a schematic sectional view showing the whole, and (b) is a schematic view showing a rotary polygon mirror part.

FIG. 2 is a schematic sectional view showing a main part of a deflection scanning device according to a second embodiment.

FIG. 3 is a schematic sectional view showing a main part of a deflection scanning device according to a third embodiment.

FIG. 4 is a schematic view of a deflection scanning device according to a fourth embodiment;
(A) is a schematic sectional view showing the whole, and (b) is a schematic view showing a rotary polygon mirror part.

FIG. 5 is a schematic sectional view showing a main part of a conventional deflection scanning device.

FIG. 6 is a schematic diagram showing an entire conventional deflection scanning device.

[Explanation of symbols]

 2: Scanner motor 3: Rotating polygon mirror 6a: Rotating shaft 6b: Bearing 7: Housing 8: Stator 9: Rotor 10: Substrate 11: Flange member 13: Spiral groove 14: Fitting part 15: Groove 16: Rotating polygon mirror Tapered part

Claims (7)

[Claims] 1. A flange member rotatably fitted to a fixed member, a rotary polygon mirror fitted and supported by the flange member at a fitting portion, and a rotor integral with the flange member and opposed to the flange member. In the deflection scanning device having a driving unit provided with a stator, a fitting portion of the rotary polygon mirror with a flange member has a shape that increases a bonding area by an adhesive,
A deflection scanning device, wherein the rotating polygon mirror is bonded and fixed to the flange member with an adhesive at the fitting portion. 2. A shape for increasing an adhesive area of the adhesive in the fitting portion is an outer peripheral surface of a fitting portion of the flange member for fitting and supporting the rotary polygon mirror, or is fitted and supported by the flange member. 2. The deflection scanning device according to claim 1, wherein the rotating polygon mirror is formed by a helical groove provided on at least one of the inner peripheral surfaces of the fitting holes of the rotary polygon mirror. 3. A shape for increasing the bonding area of the adhesive in the fitting portion, wherein the outer peripheral surface of the fitting portion of the flange member for fitting and supporting the rotary polygon mirror is fitted and supported by the flange member. 3. The deflection scanning device according to claim 2, wherein the rotation scanning mirror is formed by helical grooves provided on both surfaces of the rotating polygon mirror and an inner peripheral surface of the fitting hole. 4. The spiral groove according to claim 1, wherein an angle of the spiral groove is not equal between an outer peripheral surface of the flange member and an inner peripheral surface of the rotary polygon mirror. 4. The deflection scanning device according to 3. 5. The helical groove is formed so that the direction of the helical groove is away from the contact surface of the rotary polygon mirror with respect to the rotation direction of the rotary polygon mirror. The deflection scanning device according to claim 4. 6. A shape for increasing an adhesive area of the adhesive in the fitting portion is an outer peripheral surface of a fitting portion of the flange member for fitting and supporting the rotary polygon mirror, or is fitted and supported by the flange member. The groove is formed by a shallow groove in the axial direction or in both the axial direction and the circumferential direction provided on at least one of the inner peripheral surfaces of the fitting holes of the rotary polygon mirror. 3. The deflection scanning device according to 2. 7. A shape for increasing a bonding area of the fitting portion by an adhesive is provided on at least a part of an inner peripheral surface of a fitting hole of the rotary polygon mirror fitted and supported by the flange member. 3. The deflection scanning device according to claim 2, wherein the deflection scanning device is formed by a taper extending upward.