JPH09230268A - Polygon scanner driving device and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the deformation caused by the distortion of the polygon mirror while it is rotated at a high speed by fitting the flange member of the rotating side to the mounting hole of the polygon mirror and then, joining the mirror and the member through a plasticification deformation at the fitting part. SOLUTION: A polygon mirror 13 is pressed against a positioning surface 12d of a flange member 12 and fixed to a plasticifically deformed calking section. Since a projecting part 12c of the member 12 is plasticifically deformed, the joining is performed at the portion which is closer to the center (i.e., farther than the case of conducting a conventional screw tightening). Therefore, even though the inner peripheral section of a mounting hole 13a of the mirror 13 is slightly deformed, the deformation is relatively difficult to be transmitted to an opposite surface 13r. Moreover, even though the inner peripheral section of the hole 13a of the mirror 13 is slightly deformed to a larger size, the deformation is absorbed by a distortion absorbing groove 13b, the deformation of the outer side of the groove 13b is prevented and the distortion of the reflecting surface is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polygon scanner driving device used for scanning a laser beam of a laser beam printer, a digital copying machine and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a polygon scanner driving device in which a polygon mirror 23 is attached to a rotary member such as a flange member 22 is used for scanning laser light in a laser printer or the like.

This polygon scanner driving device is provided with a face-to-face brushless DC motor having a stator portion and a rotor portion, and a flange member 22 of the rotor portion axially supported by a fixed shaft 1 of the stator portion through a slide bearing 9. Are configured to be rotationally driven together with the polygon mirror 23.

The stator portion has a fixed shaft 1 having a spherically shaped tip, a collar 2 into which the fixed shaft 1 is press-fitted, and a base member 3 for fixing the collar 2 so that the shaft center is vertical. A substrate 4 to which a screw (not shown) is fixed on the base member 3, a winding coil 5 which is bonded and fixed to a predetermined position of the substrate 4, and a substrate 4 at a predetermined position in the winding coil 5.
And a Hall element 6 for detecting the magnetic pole of the rotor magnet 15, a control circuit 7 fixed on the substrate 4 for switching the excitation, and a connector 8.

[0005] Further, the rotor portion is provided with a thrust cover 11 to which a thrust plate 10 for supporting the radial direction is fixed.
A flange member 22 for adhesively fixing the thrust cover 11, a female screw portion 22b provided in the vicinity of the outer periphery of the flange member 22, and a cylindrical protrusion 2 of the flange member 22.
Polygon mirror 23 inserted and attached to 2c
A rotor yoke 14 attached to the lower surface of the flange member 22 and a rotor magnet 15 bonded to the rotor yoke 14.

In this conventional polygon scanner driving device, as shown in FIG. 4, the rotor yoke 14 is fixed to the lower surface of the flange member 22 to which the polygon mirror 23 is attached, and the rotor magnet 15 is fixed to the lower surface of the rotor yoke 14. Further, the fixed shaft 1 is mounted in the through hole 22a at the center of the flange member 22 via the slide bearing 9, the thrust plate 10, and the thrust cover 11, and the lower end portion of the fixed shaft 1 is connected via the collar 2. The base member 3 and the substrate 4 are fixed. On the substrate 4, a winding coil 5 facing the rotor magnet 15 via a predetermined gap, a Hall element 6 in the winding coil 5, a control circuit 7 for switching excitation, and a connector 8 are provided.

As shown in FIG. 5, the polygon mirror 23 of such a polygon scanner driving device is a regular hexagonal columnar body having six reflecting surfaces 23r on the outer peripheral surface (side surface). Further, a mounting hole 23a having a circular cross section is formed in the polygon mirror 23 coaxially with the shaft so as to penetrate from the top surface to the bottom surface, and the fastening screw 16 is loosely fitted around the mounting hole 23a in the axial direction. Through hole 23b is formed. Further, the flange member 22 to which the polygon mirror 23 is attached has a female screw portion 22 into which the tightening screw 16 is screwed.
b is formed corresponding to the through hole 23b of the polygon mirror 23.

As shown in FIG. 4, in order to attach such a polygon mirror 23 to the flange member 22, first,
A mounting hole 23 a of a regular hexagonal columnar body forming the polygon mirror 23 is fitted to the flange member 22. Next, the tightening screw 16 is inserted into the through hole 23b, and the tightening screw 16 is screwed into the female screw portion 22b of the flange member 22 and tightened to attach the polygon mirror 23. The polygon mirror 23 mounted in this way scans the light beam on the side reflection surface 23r while rotating about the axis of the regular hexagonal prism.

In the polygon scanner driving device as described above, there has recently been a demand for higher speed and smaller size as the laser beam printer becomes faster.

[0010]

However, usually,
When the polygon mirror 23 is rotated at a high speed, the polygon mirror 23 is deformed by heat generated by the motor itself, heat generated by air resistance, and expansion due to centrifugal force.

In the conventional polygon mirror 23, as the size of the polygon mirror 23 becomes smaller, the distance from the axially formed screw mounting through hole 23b to the reflecting surface 23r becomes smaller. The deformation caused in the tightening portion of the polygon mirror 23 due to the variation of
There was a problem that it was easy to reach r.

Further, the deformation of the polygon mirror 23 during high-speed rotation is not symmetrical with respect to the axis, and the deformation at each portion in the circumferential direction becomes uneven, resulting in a large deformation due to the distortion of the reflecting surface 23r. There is a drawback that

Therefore, in the laser beam printer using the conventional polygon scanner driving device, there is a possibility that the print quality may be deteriorated when the speed is increased. Further, in the conventional polygon scanner driving device, there is a problem that the screw is easily loosened during high speed rotation.

Therefore, the present invention solves the above-mentioned problems that occur in the conventional polygon scanner driving apparatus, and provides a polygon scanner driving apparatus and a manufacturing method thereof in which the deformation due to the distortion of the polygon mirror during high-speed rotation is reduced. To that end.

[0015]

In order to achieve the above object, in the method of manufacturing a polygon scanner driving device according to a first aspect of the present invention, a polygon for scanning a light beam with a reflecting surface on the side surface of a regular polygonal column that rotates about an axis is used. In a method of manufacturing a polygon scanner driving device including a mirror, a rotary-side flange member is fitted into a mounting hole of the polygon mirror, and thereafter the polygon mirror and the flange member are joined by plastic deformation at the fitting portion. It has a feature.

According to a second aspect of the present invention, there is provided a method of manufacturing a polygon scanner driving device according to the first aspect of the present invention, wherein the polygon mirror is distorted coaxially with the polygon mirror outside the joint. It is characterized in that an absorption groove is formed.

According to a third aspect of the present invention, there is provided a method of manufacturing a polygon scanner driving device according to the first or second aspect, wherein the plastic deformation is
It is characterized in that it is an outer caulking joint of the flange member.

According to a fourth aspect of the present invention, there is provided a method of manufacturing a polygon scanner driving device according to any one of the first to third aspects, wherein the plastic deformation is caused by rotating the polygon mirror in plan view. It is characterized in that it is applied to a portion where a line connecting the center and the corner apex intersects with the fitting portion.

According to a fifth aspect of the present invention, there is provided a polygon scanner driving device including a polygon mirror for scanning a light beam on a reflecting surface on a side surface of a regular polygonal column which rotates about an axis. Equipped with a rotary side flange member that fits into the mounting hole of
The feature is that the polygon mirror and the flange member are joined by plastic deformation at this fitting portion.

According to a sixth aspect of the present invention, there is provided a polygon scanner driving device according to the fifth aspect, wherein the polygon mirror is provided with a strain absorbing groove coaxial with the polygon mirror outside the joint. It is characterized by

According to a seventh aspect of the present invention, there is provided the polygon scanner driving device according to the fifth or sixth aspect, wherein the plastic deformation is an outward caulking joint of the flange member.

According to an eighth aspect of the present invention, there is provided the polygon scanner driving device according to the seventh aspect, wherein the flange member is provided with a projecting portion at an outermost periphery of the fitting portion and inside the projecting portion. It is characterized by including adjacent groove portions.

According to a ninth aspect of the present invention, there is provided a polygon scanner driving device according to any one of the fifth to eighth aspects, wherein the polygon scanner driving device is on a line connecting a center of rotation of the polygon mirror in plan view and a corner vertex. Is characterized by.

Further, in the polygon scanner driving device of the tenth aspect, a polygon mirror which rotates about an axis of a regular polygonal column whose side surface is a reflecting surface, and a flange member which is fitted in a mounting hole of the polygon mirror. In a polygon scanner driving device including a rotor magnet attached to the flange member via a rotor yoke, and a coil attached to the substrate so as to face the rotor magnet in the axial direction, a polygon mirror is provided at the fitting portion. It is characterized in that it is joined to the flange member by plastic deformation.

Further, in the polygon scanner driving device according to the eleventh aspect, in the polygon scanner driving device according to the tenth aspect, the polygon mirror is provided with a strain absorbing groove coaxial with the polygon mirror on the outer side of the joining portion. It is characterized by

According to a twelfth aspect of the present invention, there is provided the polygon scanner driving device according to the tenth or eleventh aspect, wherein the plastic deformation is an outward caulking joint of the flange member.

Further, in a polygon scanner driving device according to a thirteenth aspect, in the polygon scanner driving device according to the twelfth aspect, the flange member has a plastically deformed portion at an outermost periphery of a fitting portion and an inner side of the plastically deformed portion. And a groove portion adjacent to.

A polygon scanner driving device according to a fourteenth aspect is the polygon scanner driving device according to any one of the tenth to thirteenth aspects, wherein the plastic deformation position connects the rotation center of the polygon mirror in plan view and the corner vertex. Characterized by being on the line.

When the flange member fitted in the mounting hole of the polygon mirror is joined by plastic deformation, the flange member can be joined near the center of the conventional screw-fastening through hole, that is, away from the reflecting surface, and can be downsized. Deformation due to plastic deformation is difficult to be transmitted to the reflecting surface of the polygon mirror. In addition, since it is plastically deformed, the holding is not loosened even at high speed rotation.

When the strain absorbing groove is provided, the force due to the plastic deformation transmitted to the mounting hole of the polygon mirror is absorbed in the strain absorbing groove, so that the deformation of the reflecting surface due to the strain can be reduced.

When the flange member side is plastically deformed by the outer caulking, the polygon mirror side is not plastically deformed, so that the force applied to the polygon mirror side at the time of plastic deformation is small and the reflection surface is deformed. Can be prevented.

Further, in the conventional polygon scanner driving device, since the polygon mirror is attached by tightening the screw,
Although there is a problem that the screw easily loosens at high speed rotation, in this embodiment, since the polygon mirror is attached by plastic deformation, it does not loosen even at high speed rotation, and an adhesive is applied to the screw part to prevent loosening. There is no need for steps such as doing.

When plastic deformation is applied to the intersection of the polygon mirror with the center of rotation of the polygon mirror in the plan view and the apex of the corner, the same number of protrusions as the corner is caulked. It will be arranged at equal intervals in the circumferential direction. Therefore,
The deformation of the polygon mirror during high-speed rotation becomes symmetrical with respect to the axis, and each portion in the circumferential direction is deformed substantially uniformly. Further, since the plastic mirror is deformed away from the effective reflection surface of the polygon mirror, even if the deformation due to the plastic deformation is transmitted to the polygon mirror side, it is difficult to reach the reflection surface of the surface. Even if it reaches the reflective surface, it is difficult to reach the effective reflective surface.

A protrusion at the outermost periphery of the fitting portion of the flange member,
When the groove portion adjacent to the inside of this protrusion is provided,
Compared with the case where the groove is not provided, the projecting portion can be plastically deformed with less force, and the plastic deformation is easy.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical sectional side view showing an embodiment of a polygon scanner driving device according to the present invention, and is a view showing an embodiment to which the present invention is applied to a polygon scanner driving device used in a laser beam printer. In FIG. 1, the same parts as those in FIG. 4 are designated by the same reference numerals and the description thereof will be omitted.

This polygon scanner driving device is provided with a face-to-face brushless motor having a stator portion and a rotor portion, like the conventional polygon scanner driving device described above.

In this embodiment, a strain absorbing groove 13b is formed outside the mounting hole 13a of the polygon mirror 13, that is, at a position closer to the outer periphery by a predetermined length from the mounting hole 13a. Here, the predetermined length means a length sufficient to absorb strain. The strain absorbing groove 13b is formed to a depth of 0.5 mm in this embodiment.

Further, the cylindrical projection 12 of the flange member 12
On the upper surface of a, a ring-shaped protruding portion 12c formed on the outermost periphery and a ring-shaped groove portion 12b adjacent to the inner side of the protruding portion 12c for facilitating plastic deformation of the protruding portion 12c are formed.

To attach the polygon mirror 13 to the flange member 12 of the rotor portion, first, the flange member 1 is attached.
The mounting hole 1 for the polygon mirror 13 is attached to the cylindrical protrusion 12a of 2
3a is fitted. Next, the attachment surface 13c of the polygon mirror 13 is brought into close contact with the highly accurate positioning surface 12d of the flange member 12. Then, the flange member 12
The polygonal mirror 13 is fixed to the flange member 12 by plastically deforming the protruding portion 12c of the cylindrical protruding portion 12a by an outer caulking joint using a caulking type, for example. At this time,
Positioning surface 12 of flange member 12 formed with high precision
Since the mounting surface 13c of the polygon mirror 13 is pressed against d, the reflecting surface 13r on the side surface of the polygon mirror 13 is positioned with high accuracy.

Further, as in the conventional case, the rotor magnet 15 adhered to the rotor yoke 14 is attached via the rotor yoke 14 so as to maintain a predetermined axial clearance with the winding coil 5 adhered and fixed on the substrate 4. Has been.

As described above, since the rotor magnet 15 integrally attached to the flange member 12 faces the winding coil 5 attached on the substrate 4 with a predetermined axial clearance, these rotor magnets 15 are opposed to each other. The winding coil 5 and the winding coil 5 form a motor. By applying a predetermined current to the winding coil 5 of this motor, the rotor magnet 1
A rotational force is generated in the center hole 5 of the flange member 12
The rotating body pivotally supported by the slide bearing 9 and the thrust plate 10 fitted in e rotates. In this way, when the polygon mirror 13 integrally attached to the flange member 12 rotates, the laser light reflected by the polygon mirror 13 is emitted to the outside.

FIG. 2 shows a polygon mirror 13 according to the present invention.
3A and 3B are enlarged vertical side views showing a fixing method of the polygon mirror 13, wherein FIG. 8A shows a state before fixing and FIG. 8B shows a state after fixing. It is a figure. In FIG. 2,
Only the polygon mirror 13 and the flange member 12 are shown, and other parts are omitted. As described above, the cylindrical protrusion 12a of the flange member 12 into which the mounting hole 13a of the polygon mirror 13 is fitted is coaxial with the axis O.
c is provided. Further, a strain absorbing groove 13b is provided near the outer periphery of the mounting hole 13a of the polygon mirror 13 in the mounting hole 1.
It is provided coaxially with 3a.

As shown in FIG. 2A, the protruding portion 12c is plastically deformed outward by, for example, a caulking type,
As shown in FIG. 2B, the polygon mirror 13 is pressed and fixed onto the positioning surface 12d of the flange member 12 by the caulked portion K that has been plastically deformed. At this time, since the projecting portion 12c of the flange member 12 is plastically deformed, it is possible to join at a portion closer to the center (that is, farther from the reflection surface) than in the case of conventional screw tightening, and the mounting hole 13 of the polygon mirror 13 is attached.
Even if the inner peripheral portion of a is slightly deformed, the deformation is hard to reach the reflecting surface 13r.

Also, the mounting hole 13a of the polygon mirror 13
Even if the inner peripheral portion of the strain absorbing member 1 is deformed a little more, the strain absorbing groove 13b absorbs the deformation.
It is possible to prevent the outside of 3b from being deformed, and thus to prevent distortion of the reflecting surface.

As shown in FIG. 3, the crimping position for fixing the polygon mirror 13 is a straight line and a flange extending from the axis O of the polygon mirror 13 to each connection point (corner apex) of the adjacent reflecting surfaces 13r. Cylindrical protrusion 12 of member 12
It is located at the intersection with the ring-shaped protrusion 12c provided in a. That is, the crimp portion K is provided at a portion where the line connecting the rotation center of the polygon mirror 13 in plan view and the corner vertex 13f intersects with the annular fitting portion. Therefore, since they are equidistant from the axis O, that is, on the circumference centered on the axis O, the caulking portions K can have equal intervals in the circumferential direction.

Further, the projecting portion 1 provided on the flange member 12
2c is caulked to fix the polygon mirror 13 to the flange member 12
The deformation of the protrusion 12c transmitted to the outer periphery of the mounting hole 13a of the polygon mirror 13 when fixed to the strain absorbing groove 1 provided near the outer periphery of the mounting hole 13a of the polygon mirror 13
Since it is absorbed by 3b, the effect of the caulking portion K is
It becomes difficult to reach r, and deformation due to distortion of the reflecting surface 13r can be reduced. Also, the strain absorbing groove 13b
It can also be used as a balance adjustment groove by adding a weight for correcting the balance of the rotating body.

Furthermore, since the ring-shaped strain absorbing groove 13b is formed coaxially with the central axis of the polygon mirror 13, the radial thickness of the polygon mirror 13 becomes close to uniform at each position in the circumferential direction, and the polygon The thermal expansion of the mirror 13 becomes nearly uniform at each position in the circumferential direction. When the polygon mirror 13 is used at high speed, even if it receives expansion due to a large centrifugal force and heat generated by the motor itself, the tightening torque does not vary, so that the shaft O is symmetrically deformed. .
As a result, the deformation due to the distortion in each portion in the circumferential direction becomes substantially uniform, so that the reflecting surface 13r is not greatly deformed. The crimping depth of the protrusion 12c can be about 0.5 mm.

In the above embodiments, the axis serving as the center of rotation of the polygon mirror is a fixed shaft fixed to the stator side, but a bearing may be provided on the stator side and the fixed shaft may be fixed to the rotor side.

Further, for example, in a projecting portion having a ring shape in plan view and having a large number of slits, at least three projecting portions at equal intervals on the line connecting the shaft center and the corner ridge may be crimped. . Furthermore, by cutting off the protrusion, it can be used as a balancer.

A plurality of axial slits may be formed in the ring-shaped protrusion of the flange member. In this case, by setting the number of slits to be a multiple of the number of angles provided for the regular polygon of the polygon mirror, each piece of the protrusion can be positioned on the line connecting the center of the polygon mirror and the corner vertex. it can. When a large number of protrusions are formed in this way, the rotational balance on the rotor side can be adjusted by cutting off a part of the protrusions.
In addition, when a large number of slits are formed in this way, the mounting workability is higher than in the case where only the portions corresponding to the corners are formed as protrusions.

Further, in the above embodiment, the same number of caulking portions are formed corresponding to the corner portions, but at least three places (in this case, the central angle is 120) corresponding to every other corner portion, for example. If it is made to correspond to all the corners, it is not necessary to form the crimped parts so as to correspond to all the corners.

Further, it is advantageous to reduce the weight on the rotor side by cutting off the other protruding portions while leaving only the portions to be crimped beforehand.

In the above embodiment, the case of the outer caulking joint in which the flange member side is plastically deformed has been described, but an inner caulking joint in which the polygon mirror side is plastically deformed may be used. However, in this case, for example, by providing a projection projecting toward the axial center at the lower end of the inner diameter of the polygon mirror, providing a recess at a corresponding position of the flange member, and inserting the projection in the recess, It is necessary to prevent the polygon mirror from rising by sandwiching the flange member between the plastically deformed portion and the protrusion.

[0054]

As is apparent from the above description, according to the first aspect of the invention, when the flange member fitted in the mounting hole of the polygon mirror is joined by plastic deformation, it is deformed by plastic deformation even if it is downsized. Is less likely to be transmitted to the reflecting surface of the polygon mirror, it is possible to reduce deformation of the reflecting surface when the polygon mirror is attached and deformation of the reflecting surface during high speed rotation. Therefore, if the present invention is applied to the polygon scanner driving device of the high-speed laser beam printer, the printing quality can be improved.

According to the invention of claim 2, since the strain absorbing groove is provided, the force due to the plastic deformation transmitted to the mounting hole of the polygon mirror is absorbed in the strain absorbing groove. Therefore,
The deformation due to the distortion of the reflecting surface can be further reduced as compared with the case where there is no strain absorbing groove.

Further, according to the invention of claim 3, since the plastic deformation is performed by the outer caulking joint of the flange member, that is, since the polygon mirror side is not plastically deformed, the force applied to the polygon mirror side during plastic deformation is small. Therefore, the deformation due to the distortion of the reflecting surface can be further reduced.

According to the fourth aspect of the invention, the plastic deformation is applied to the intersection of the fitting portion and the line connecting the center of rotation of the polygon mirror in plan view and the corner apex. The deformation due to is difficult to be transmitted to the reflection surface of the surface, and even if it is transmitted to the reflection surface of the surface, it is difficult to be transmitted to the effective reflection surface. Therefore, it is possible to further reduce deformation due to distortion in the effective reflection surface.

Further, according to the invention of claim 5, when the flange member fitted in the mounting hole of the polygon mirror is joined by plastic deformation, the deformation due to plastic deformation is caused on the reflecting surface of the polygon mirror even if the size is reduced. Since it is difficult to transmit, it is possible to reduce the deformation of the reflecting surface when the polygon mirror is attached and the deformation of the reflecting surface during the high speed rotation. Therefore, if the present invention is applied to the polygon scanner driving device of the high-speed laser beam printer, the printing quality can be improved.

Further, according to the invention of claim 6, since the strain absorbing groove is provided, the force due to the plastic deformation transmitted to the mounting hole of the polygon mirror is absorbed in the strain absorbing groove, and the strain of the reflecting surface is caused. The deformation can be reduced.

According to the invention of claim 7, since the plastic deformation is performed by the outer caulking joint of the flange member, that is, since the polygon mirror side is not plastically deformed, the force applied to the polygon mirror side during plastic deformation is small. Therefore, the deformation due to the distortion of the reflecting surface can be further reduced.

Further, according to the invention of claim 8, since the groove is provided inside the projecting portion, the plastic deformation of the projecting portion can be facilitated.

According to the ninth aspect of the invention, the plastic deformation is applied to the intersection of the fitting portion and the line connecting the center of rotation of the polygon mirror in plan view and the corner apex. The deformation due to is difficult to be transmitted to the reflection surface of the surface, and even if it is transmitted to the reflection surface of the surface, it is difficult to be transmitted to the effective reflection surface. Therefore, it is possible to further reduce deformation due to distortion in the effective reflection surface.

According to the tenth aspect of the present invention, when the flange member fitted in the mounting hole of the polygon mirror is joined by plastic deformation, deformation due to plastic deformation is caused on the reflecting surface of the polygon mirror even if the size is reduced. Since it is difficult to transmit, it is possible to reduce the deformation of the reflecting surface when the polygon mirror is attached and the deformation of the reflecting surface during the high speed rotation. Therefore, if the present invention is applied to the polygon scanner driving device of the high-speed laser beam printer, the printing quality can be improved.

According to the eleventh aspect of the invention, since the strain absorbing groove is provided, the force due to the plastic deformation transmitted to the mounting hole of the polygon mirror is absorbed by the strain absorbing groove, and the strain of the reflecting surface is generated. The deformation can be reduced.

According to the twelfth aspect of the invention, since the plastic deformation is performed by the outer caulking joint of the flange member, that is, since the polygon mirror side is not plastically deformed, the force applied to the polygon mirror side during plastic deformation is small. Therefore, the deformation due to the distortion of the reflecting surface can be further reduced.

According to the thirteenth aspect of the present invention, since the groove is provided inside the protrusion, the plastic deformation of the protrusion can be facilitated.

According to the fourteenth aspect of the invention, the plastic deformation is applied to the intersection of the line connecting the rotation center of the polygon mirror in plan view and the corner apex with the fitting portion. The deformation due to is difficult to be transmitted to the reflection surface of the surface, and even if it is transmitted to the reflection surface of the surface, it is difficult to be transmitted to the effective reflection surface. Therefore, it is possible to further reduce deformation due to distortion in the effective reflection surface.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing an embodiment of a polygon mirror device according to the present invention.

2A and 2B are enlarged vertical side views showing a method of fixing a polygon mirror according to the present invention, in which FIG. 2A shows before fixing and FIG. 2B shows after fixing.

FIG. 3 is a plan view showing an attached state of a polygon mirror according to the present invention.

FIG. 4 is a vertical sectional side view of a conventional polygon scanner driving device.

FIG. 5 is a plan view showing a conventional polygon mirror.

[Explanation of symbols]

 1 Fixed Axis 4 Substrate 5 Winding Coil 12 Flange Member 13 Polygon Mirror 13a Mounting Hole 13b Strain Absorption Groove 13f Corner Apex 13r Reflective Surface 14 Rotor Yoke 15 Rotor Magnet O Rotation Center

Claims (14)

[Claims] 1. A method of manufacturing a polygon scanner driving device comprising a polygon mirror that scans a light beam on a side reflection surface of a regular polygonal column that rotates about an axis, wherein a rotary side flange member is provided in a mounting hole of the polygon mirror. Is fitted, and then the polygon mirror and the flange member are joined by plastic deformation at this fitting portion. 2. The method of manufacturing a polygon scanner driving device according to claim 1, wherein the polygon mirror is provided with a strain absorbing groove coaxial with the polygon mirror on the outer side of the joining portion. 3. The method for manufacturing a polygon scanner driving device according to claim 1, wherein the plastic deformation is an outward caulking joint of the flange member. 4. The plastic deformation is applied to a portion where a line connecting a rotation center of the polygon mirror in plan view and a corner vertex is intersected with the fitting portion. A method for manufacturing a polygon scanner driving device according to any one of claims. 5. A polygon scanner driving device comprising a polygon mirror for scanning a light beam on a reflecting surface on the side of a regular polygonal column which rotates about an axis, wherein a rotary side flange fitted into a mounting hole of the polygon mirror. Equipped with members,
A polygon scanner driving device characterized in that the polygon mirror and the flange member are joined by plastic deformation at this fitting portion. 6. The polygon scanner driving device according to claim 5, wherein the polygon mirror is provided with a strain absorbing groove coaxial with the polygon mirror on the outer side of the joining portion. 7. The polygon scanner driving device according to claim 5, wherein the plastic deformation is an outward caulking joint of the flange member. 8. The polygon scanner driving device according to claim 7, wherein the flange member includes a protrusion on the outermost periphery of the fitting portion and a groove adjacent to the inside of the protrusion. 9. The polygon scanner driving device according to claim 5, wherein the plastic deformation position is on a line connecting a center of rotation of the polygon mirror in plan view and a corner vertex. 10. A polygon mirror that rotates about an axis of a regular polygonal column whose side surface is a reflecting surface, a flange member that is fitted into a mounting hole of the polygon mirror, and a flange member that is attached to the flange member via a rotor yoke. In the polygon scanner driving device including a rotor magnet and a coil attached to the substrate so as to face the rotor magnet in the axial direction, the polygon mirror and the flange member are joined by plastic deformation at the fitting portion. A polygon scanner driving device characterized in that 11. The polygon scanner driving device according to claim 10, wherein the polygon mirror is provided with a strain absorbing groove coaxial with the polygon mirror on the outer side of the joining portion. 12. The polygon scanner driving device according to claim 10, wherein the plastic deformation is an outer caulking joint of the flange member. 13. The polygon scanner driving device according to claim 12, wherein the flange member includes a plastically deformed portion on the outermost periphery of the fitting portion and a groove portion adjacent to the inside of the plastically deformed portion. . 14. The polygon scanner driving device according to claim 10, wherein the plastic deformation position is on a line connecting a center of rotation of the polygon mirror in plan view and a corner vertex.