JPH11183834A - Deflecting scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deflecting scanner capable of remarkably improving its characteristics such as miniaturization, cost reduction and high performance by sharply reducing the axial direction demensions of a driving part for a rotary polygon mirror and reducing the number of parts for fixing the polygon mirror and suppressing the increment of unbalance due to environmental variation. SOLUTION: In the deflecting scanner having a driving part provided with a flange member 11 having a supporting part for a rotary polygon mirror and allowed to be rotationally engaged with a fixing part, the rotary polygon mirror engaged and supported with/by the member 11, a rotor united with the member 11, and a stator opposed to the rotor, one or more grooves 20 each of which spreads its adhesive face side are formed at least on a part of a rotary polygon mirror supporting part of the member 11 and a supported part of the polygon mirror 3 and the polygon mirror 3 is fixed to the member 11 with adhesive 19 in the groove part 20.

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 rotary polygon mirror 101 is positioned by the flange member 1, and the pressing plate 1 is screwed around the upper end of the shaft 2a 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 reason, 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, which increases the cost of parts. There was a problem in inviting. In addition, the flange member and the rotating shaft have to be largely protruded above the polygon mirror, so that the flange member and the rotating shaft are extremely long. As a result, there is a problem in that the entire driving section of the rotary polygon mirror becomes bulky, which hinders miniaturization of the deflection scanning device. Furthermore, the shape of the device may be complicated, which may increase windage loss and imbalance. In addition, if a concave portion is provided in the support member and the rotary polygon mirror is to be bonded to the flange member, the adhesive may be used to support the rotary polygon mirror on the flange member. There is a problem that the flattening of the supporting surface is degraded due to the wraparound.

Therefore, the present invention solves the problems of the prior art described above, greatly reduces the axial dimension of the drive unit of the rotary polygon mirror, and reduces the number of parts for fixing the rotary polygon mirror. Accordingly, it is an object of the present invention to provide a deflection scanning device which can significantly reduce the size, cost, and performance of the device, and does not increase unbalance with respect to environmental fluctuation. .

[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 according to the present invention includes a flange member having a support portion of the rotary polygon mirror and rotatably fitted to the fixed member, a rotary polygon mirror fitted and supported by the flange member, and the flange member. In the deflection scanning device having a driving unit including an integral rotor and a stator opposed thereto, at least a part of a supporting part of the rotary polygon mirror of the flange member or a supported part of the rotary polygon mirror has a wide adhesive surface side. One or more grooves are provided, and the rotary polygon mirror is adhesively fixed to the flange member at the grooves. Further, the deflection scanning device of the present invention is characterized in that the groove is an annular groove and both ends in the radial direction are formed in a tapered shape. Further, the deflection scanning device of the present invention is characterized in that the groove is an annular groove and a plurality of grooves having different groove widths are combined to form one groove. Further, in the deflection scanning device of the present invention, the groove is a single annular groove, and a center side of the annular groove is formed lower than a supporting portion of the rotary polygon mirror or a supported portion of the rotary polygon mirror. It is characterized by.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the above-mentioned construction, at least a part of the supporting part of the rotary polygon mirror of the flange member or the supported part of the rotary polygon mirror is provided with a groove having an enlarged bonding surface side. The polygon mirror can be firmly fixed to the flange member, eliminating the necessity of a component such as a holding plate, a tightening washer, and a holding spring for fixing the conventional rotating polygon mirror. Further, the flange member and the rotating shaft do not protrude significantly above the rotary polygon mirror, and there is no need to form a shaft groove for tightening the tightening washer. Therefore, it is possible to reduce the cost of parts, reduce the size of the rotating body including the rotary polygon mirror, the flange member, and the flange member in the axial direction, and reduce the inertia, windage loss, and imbalance. As a result, the cost of the apparatus can be reduced, the size of the entire apparatus can be reduced, and the optical characteristics of the rotary polygon mirror can be greatly improved.

[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, which has a bearing 6b supported by a housing 7 and a rotating shaft 6a rotatably supported by the bearing 6b. An optical deflector. 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 flange member 1
As shown in FIG. 1b, at least a part of the rotary polygon mirror support portion 13a has an annular groove 18 tapered so that the adhesive surface side is widened in a sectional shape. FIG. 2 is an enlarged cross-sectional view of the deflection scanning device according to the first embodiment. The adhesive 19 is raised higher than the seat surface due to the surface tension of the adhesive 19 itself when the adhesive is applied. When the mirror 3 is placed, the crushed adhesive 19 flows into the tapered portion, so that the rotary polygon mirror 3 is bonded and fixed to the flange member 11 without affecting the seating surface.

FIG. 3 shows a modification according to the first embodiment, in which a groove having an enlarged bonding surface side is an annular groove like a groove 20, and a plurality of grooves having different groove widths are combined. The groove may be configured in this embodiment. -30 to 80 ° C as adhesive
The viscosity is not particularly limited as long as it is a type having excellent mechanical properties such as toughness and hardness in a temperature environment of, for example, a thermoplastic resin is combined with a thermosetting resin adhesive or an anaerobic adhesive or a curable resin. An adhesive or the like is used. The groove 18 on the flange member is cut by a lathe or the like. Also, in the cutting process, it is preferable that the surface roughness is large from the viewpoint of obtaining an adhesive force. This is because the bonding area is increased in microscopic view. In the present embodiment, the rotary polygon mirror 3 is fitted to the upper protruding portion of the flange member 11, but may be fitted directly to the shaft 6a. Further, in this embodiment, the case where one groove is used has been described. However, when the adhesive strength is insufficient, a plurality of grooves may be provided.

With the above-described structure, the rotary polygon mirror 3 can be bonded and fixed to the flange member 11 without deteriorating the accuracy of the bearing surface, and a pressing spring or the like is fixed to the flange member 11 or the shaft 6a. There is no need to reduce the axial dimension of the rotating body composed of the rotating polygon mirror 3 and the flange member to reduce the size of the drive unit, thereby reducing inertia and windage loss. In addition, whirling vibrations of the rotary polygon mirror can be reduced, so that optical characteristics can be greatly improved, component costs can be reduced, and cost reduction of the apparatus can be promoted.

[Embodiment 2] FIG. 4 shows a main part of a deflection scanning apparatus according to Embodiment 2 of the present invention. The flange member 11 has at least a part of the rotary polygon mirror support portion 13a, and an adhesive surface side is widened in a sectional shape. It has an annular groove 21, and the center side of the annular groove 21 is lower than the rotating polygon mirror support 13 a. With such a configuration, even when the amount of the adhesive 19 applied is large, when the rotary polygon mirror 3 is placed, the crushed adhesive 19 flows into the inside of the annular shape, so that the rotary polygon mirror support portion 13a The rotary polygon mirror 3 can be adhered and fixed to the flange member 11 without invading, and the same effects as those of the first embodiment can be obtained, and the type and amount of the adhesive can be varied. Further, in the configuration as in the present embodiment, when viewed from the adhesive, the shear force between the rotating polygon mirror and the supporting portion thereof (caused by the inertia of the polygon at the time of the rotation start) becomes smaller as the adhesive is closer to the rotating state. Therefore, it is preferable from the viewpoint of adhesive strength.

[0013]

As described above, according to the present invention, at least a part of the support portion of the rotary polygon mirror of the flange member or the supported portion of the rotary polygon mirror is provided with one groove having a wide adhesive surface side. By providing and fixing the rotary polygon mirror to the flange member with the groove, the rotary polygon mirror can be firmly fixed to the flange member without affecting the accuracy of the seating surface. The shaft dimensions of the drive unit can be reduced, and the drive unit can be greatly reduced in size, vibration prevention, inertia reduction, component cost reduction, and imbalance reduction. An inexpensive 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 diagram illustrating a main part of a deflection scanning device according to a first embodiment.

FIG. 2 is a schematic enlarged cross-sectional view showing a main part of the deflection scanning device according to the first embodiment.

FIG. 3 is a schematic enlarged cross-sectional view illustrating a main part of a deflection scanning device according to a modification of the first embodiment.

FIG. 4 is a schematic cross-sectional view illustrating a main part of a deflection scanning device according to a second embodiment.

FIG. 5 is a schematic cross-sectional view showing an entire conventional deflection scanning device.

FIG. 6 is a schematic view 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 13a: Rotating polygon mirror support on flange member 13b: Cover of rotating polygon mirror Support groove 15: Coil 18: Groove 19: Adhesive 20, 21: Groove

Claims (4)

[Claims] A flange member rotatably fitted to a fixed member having a support portion of the rotating polygon mirror, a rotating polygon mirror fitted and supported by the flange member, and a rotor integral with the flange member. In the deflection scanning device having a driving unit having a stator opposed thereto, at least a part of a supporting part of the rotary polygon mirror of the flange member or a supported part of the rotary polygon mirror has a groove having a wider bonding surface side. Provide one or more,
A deflection scanning device, wherein the rotary polygon mirror is adhesively fixed to the flange member at the groove. 2. The deflection scanning device according to claim 1, wherein the groove is an annular groove, and both ends in the radial direction are tapered. 3. The deflection scanning device according to claim 1, wherein the groove is an annular groove and a plurality of grooves having different groove widths are combined to form one groove. 4. A groove according to claim 1, wherein said groove is formed as a single annular groove, and a center side of said annular groove is formed lower than a support portion of said rotary polygon mirror or a supported portion of said rotary polygon mirror. The deflection scanning device according to claim 1.