JPS63199315A - Fixing method for rotary polygon mirror - Google Patents

Abstract

PURPOSE:To surely and rigidly fix a rotary polygon mirror by providing plural fitting holes between the upper or lower face of the rotary polygon mirror and a supporting member to be contacted with the upper or lower face and inserting coupling members having elasticity in their vertical direction and having rigidity in the rotational direction of the polygon mirror into the fitting holes. CONSTITUTION:Rectangular parallelepiped-like fitting holes 10, 11 are provided oppositely to each other on three positions each of the supporting face 3a of the supporting member 3 and the lower face 1a of the rotary polygon mirror 1 with equal intervals so that the U-shaped elastic coupling members 13 can be inserted into the holes between the supporting face 3a and the lower face 1a. The U-shaped opening ends 13a, 13b of the fitting holes 10, 11 are opened in the vertical direction and provided with elasticity in the vertical direction and rigidity in the rotational direction of the polygon mirror 1. Thereby, the rotary polygon mirror can be surely and rigidly fixed without being shifted from the rotational axis.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a rotating polygon mirror used in a laser deflector for a laser printer, a digital copying machine, a fax machine, etc., and particularly relates to a method for fixing a rotating polygon mirror. .

[Conventional technology]

Conventionally, rotating polygon mirrors used in laser deflectors are prone to misalignment with respect to the rotation axis during high-speed rotation, starting and stopping, and various problems arise when tightening with high torque to prevent misalignment. was alive.

That is, as a conventional device for fixing a rotating polygon mirror to a rotating shaft as shown in FIG. is fixed. Although this device provides reliable fixing, the screws 25 may become unstable due to variations in torque when tightening, the dynamic balance may be lost during high-speed rotation due to the screws/tapped holes, etc., and other problems may occur, such as poor assembly and large size of the device. This causes problems such as oxidation and weight increase.

In order to solve these problems, rotating polygon mirror fixing means □ as shown in FIGS. 8 to 10 have been disclosed.

In FIG. 8, a rotating polygon mirror 21 is fixed on a support member 23 provided on a rotating shaft 22 by an elastic body 26, and the elastic body 26 has a shape as shown in FIG. In FIG. 9, a locking member 2 consisting of a presser member 24 and an E-ring is shown.
The rotating polygon mirror 21 is fixed to a support member 23 formed on the rotating shaft 22 by a compression spring 27 between the rotary polygon mirror 21 and the rotary shaft 22 . Furthermore, in FIG. 1θ, a wave washer is used as the elastic member 29, and the rotating polygon mirror 21 is fixed.

In these conventional rotating polygon mirror fixing devices, the rotating polygon mirror is simply clamped between a support member and a pressing member, and the rotation speed of the rotating polygon mirror is 10.00 Or.

In the case of high speeds exceeding p and m or in the case of large-sized rotating polygon mirrors, the rotating polygon mirror has the disadvantage of misalignment with respect to the supporting member and rotation axis during acceleration and deceleration such as starting and stopping. are doing. In order to prevent this displacement of the rotating polygon mirror that occurs in the rotation direction, it is possible to increase the elastic force of the elastic body or compression spring to increase the pressure applied in the axial direction. It causes sexual problems.

[Purpose of the Invention] □ The present invention solves the disadvantages of attaching the rotating polygon mirror □ to the rotating shaft in a conventional optical deflector, and even when the rotating polygon mirror is large, it is possible to easily support the rotating shaft during high-speed rotation. To provide a reliable and simple fixing method that does not cause displacement of members in the rotational direction.

[Structure of the invention]

In order to achieve the above object, the present invention places a rotating polygon mirror on a support member provided on a rotating shaft, places a pressing member on the upper surface □ of the rotating polygon mirror, and supports the rotating polygon mirror. In the case where the rotating polygon mirror is clamped between a member and a pressing member, mounting holes are provided between the upper surface or lower surface of the rotating polygon mirror and a supporting member in contact with the upper surface or lower surface, and elasticity is applied to the mounting holes in the vertical direction. It is characterized by having a coupling member fitted therein and having rigidity in the direction of rotation.

Embodiments of the present invention will be described based on the drawings. Figure 1 shows
This is a sectional view of a first embodiment of the present invention, in which a support member 3 is fixed to a rotating shaft 2 by press fitting or adhesive.

The support member 3 is a support surface 3 that supports the lower surface 1a of the rotating polygon mirror 1.
a, and a cylindrical part 3b which is interposed between the rotating shaft 2 and the inner circumferential surface 1b of the rotating polygon mirror 1, and whose upper surface has the same height as the upper surface IC of the rotating polygon mirror 1, Therefore, the rotating polygon mirror 1 is configured to receive forces in the radial direction and the thrust direction.

Between the support surface 3a of the support member 3 and the lower surface la of the rotating polygon mirror l, an elastic coupling member 13 having a U-shape as shown in FIG.
Rectangular parallelepiped-shaped mounting holes 10 and 11 are provided in the supporting surface 3a of the supporting member 3 and the lower surface 1a of the rotary polygon mirror 1 at opposing positions, respectively, so that the polygon mirror 1 can be fitted therein. As is clear from the exploded perspective view of FIG. 2, the rectangular parallelepiped-shaped mounting holes 10 and 11 are provided at three equal intervals.

The support surface 3a of the support member 3 and the lower surface 1a of the rotating polygon mirror 1
An elastic coupling member 1 inserted into each mounting hole 10.11 of
3 has U-shaped open ends 13a, 13a that are open in the vertical direction, and the U-shaped open ends 13at1.
When force is applied to 3a in two axial directions, it can be displaced, and the U-shaped side end 13b.

It has a structure that does not displace even if force is applied to the rotating polygon mirror 13b in the y-axis direction.In other words, it has an elastic force in the vertical direction (two directions in FIG. 5), which is the mounting direction, and It is made of a member that has rigidity in the direction of rotation (y direction in FIG. 5). As shown in Fig. 5, the elastic coupling member has rigidity in the radial direction (X direction), high rigidity force in the rotational direction (y direction), and elastic force in the mounting direction (two directions). 13 is accommodated in the mounting hole 10 so as to match that direction, and once the elastic coupling member 13 is accommodated with its direction regulated, it will not move within the rectangular parallelepiped-shaped mounting hole 10.11.

As shown in FIG. 2, the elastic coupling members 13 are housed in the three mounting holes 10 formed in the supporting surface 3a of the supporting member 3, taking into consideration their directionality, and the lower surface of the rotating polygon mirror 1 is viewed from above. The mounting hole 11 formed in 1a is aligned with the mounting hole 10 housing the elastic coupling member 13, and the supporting member 3 and the rotating polygon mirror 1 are combined via the elastic coupling member 13, and placed on the upper surface of the rotating polygon mirror 1. A presser member 4, a groove 2 formed on the rotating shaft 2
A is pressed by a locking member 8 made of an E-ring.

In this way, the rotating polygon mirror 1 is fixed to the rotating shaft 2.

With the above fixing method, the rotating polygon mirror is formed by an elastic coupling member that is closely connected to the rotational direction surfaces 1, la of the mounting hole 11 of the rotating polygon mirror 1 and the rotational direction surface 10a of the mounting hole 10 of the support member 3 in the rotation direction. 13 with a high rigidity force, the polygon mirror 1 is reliably fixed without any displacement, and the rotating polygon mirror 1 is pressed against the support member 3 by the elastic force in the mounting direction of the elastic coupling member 13. The rotating polygon mirror 1 can be securely and easily fixed to the support member 3 on the rotating shaft 2 side via the elastic coupling member 13.

A second embodiment of the invention is shown in FIGS. 3 and 4.

In this embodiment, the lower end side of the elastic coupling member 13 is connected to the upper edge of the joint between the cylindrical portion 3b of the support member 3 attached to the rotating shaft 1 and the inner circumferential surface 1b of the rotating polygon mirror 1. A rectangular parallelepiped mounting hole 10.11 formed with the rotating polygon mirror 1
The upper end side of the member 13 is inserted into a rectangular parallelepiped-shaped mounting hole 10 formed in the support member 3 and the rotating polygon mirror 1.
．． 11 is inserted into a rectangular parallelepiped-shaped attachment hole 12 provided in the holding member 4.

In this way, the elastic coupling member 13 is connected to the rectangular parallelepiped-shaped mounting hole 10.11 provided in the inner peripheral part of the upper surface IC of the rotating polygon mirror 1 between it and the support member 3, and the rectangular parallelepiped-shaped mounting hole 10. As is clear from FIG. 4, each rectangular parallelepiped-shaped mounting hole is located between the mounting hole 12 and the mounting hole 12, and as is clear from FIG. do.

As shown in FIG. 4, a support member 3 having a rotating shaft 2
An elastic coupling member configured to have an elastic force in the mounting direction and a rigid force in the rotational direction of the rotating polygon mirror with the two mounting holes 10 and 11 aligned. 1
After that, the mounting hole 12 formed on the lower surface of the presser member 4 is aligned with the upper end of the elastic coupling member 13, and the upper surface of the presser member 4 is inserted from the E-ring fixed to the rotating shaft 2. As a result, the rotating polygon mirror 1 is fixed to the support member 3 and the holding member 4 via the elastic coupling member 13, as in the case of the first embodiment.
It can be easily fixed using elastic force in the mounting direction without causing any deviation in the rotational direction. 'As shown in FIG. 6, the elastic coupling member used in the present invention includes a flat plate-like rigid member 14 made of iron or the like in the center, and an elastic member 15 made of rubber or the like around both ends. It is conceivable that the elastic coupling member 13' may be modified to have a structure covered with. That is, in the elastic coupling member 13' of FIG. 6(a), the elastic member 15 is positioned around the rigid flat member 14 in two axial directions of the mounting direction (FIG. 6(b)) and the rotational direction. With the end of the rigid flat member 14 positioned in the y-axis direction (FIG. 6(c)), it is inserted into the mounting hole of the rotating polygon mirror, the supporting member, or the holding member.

〔Effect of the invention〕

With the configuration of the present invention, the rotating polygon mirror can be securely fixed to the rotation axis without shifting, even during acceleration and deceleration during high-speed rotation, starting and stopping, and especially when the rotating polygon mirror is large. This method has the advantage of being easy to assemble, contributing to miniaturization and light weight of the device, etc.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a first embodiment of the present invention, Fig. 2 is an exploded perspective view of the first embodiment of the invention when assembled, and Fig. 3 is a sectional view of another embodiment of the invention. Figure 4 is an exploded perspective view of Figure 3 when assembled, Figure 5 (A), (B), and (C).
6(A), (B), and (C) are drawings showing the structure of the elastic coupling member used in the present invention and the relationship between each direction. FIGS. Figures 7 to 10 are cross-sectional views of a conventional rotating polygon mirror fixing device; Figures 11 (A) and (B) are cross-sectional views of the elastic body in Figure 8; A plan view is shown. □ 1... Rotating polygon mirror, 2... Rotating shaft, 3... Supporting member, 4... Holding member, io, 11.12... Mounting hole, 13° 13'... Elastic coupling Element. Patent applicant Ricoh Co., Ltd.

Claims (2)

[Claims] (1) A rotating polygon mirror is placed on a support member provided on the rotating shaft, a pressing member is placed on the upper surface of the rotating polygon mirror, and the rotating polygon mirror is clamped between the supporting member and the pressing member. A mounting hole is provided between the upper or lower surface of the rotating polygon mirror and a support member in contact with the upper or lower surface, and a coupling member having elasticity in the vertical direction and rigidity in the rotational direction is installed in the mounting hole. A method for fixing a rotating polygon mirror characterized by an inset. (2) The support member provided on the rotating shaft has a cylindrical part that can fit into the inner peripheral part of the rotating polygon mirror, and a common mounting hole is provided for the rotating polygon mirror, the support member, and the pressing member, and the mounting 2. The method of fixing a rotating polygon mirror according to claim 1, wherein a coupling member having elasticity in the vertical direction and rigidity in the rotational direction is fitted into the hole.