JP2004037995A - Light deflector and manufacturing method for light deflector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light deflector capable of obtaining a stable rotation performance in high speed rotation by preventing the erroneous mounting of the constituting members of a rotation device and executing efficient and accurate assembly work in the assembly process of the rotation device having a radial dynamic pressure bearing part and a thrust dynamic pressure bearing part. <P>SOLUTION: In the light deflector 20 provided with a rotor unit 20A composed of a rotary polygon mirror 21, a flange member 23 and a magnet 24 and a stator unit 20B composed of a dynamic pressure bearing formed of an outer cylinder member 22 and an inner cylinder member 26, a supporting base body 25 and a magnet coil 29, on the upper end face 21c of the rotary polygon mirror 21, the information display parts (1), (2), (3), (4) and (5) of Figure 8 for managing the production of the rotary polygon mirror 21 are formed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical deflecting device used for an image forming apparatus such as a laser beam printer, a laser copying machine, a laser facsimile, and a bar code reader, and a method of manufacturing the optical deflecting device.
[0002]
[Prior art]
2. Description of the Related Art In an image forming apparatus such as a laser beam printer, a laser beam is incident on a rotating polygon mirror (polygon mirror) that rotates at a high speed based on information read as writing means of the image, and the reflected light is scanned on the photosensitive member surface. The image is recorded by projection.
[0003]
In the case of low-speed rotation, the rotating polygon mirror is used directly fixed to the rotating shaft of the drive motor, but when the rotation speed is high, the rotating polygon mirror is fixed to the outer cylinder member and the fixedly arranged inner cylinder member is fixed. Driving rotation is performed using a dynamic pressure bearing (air bearing) that rotates in a floating shape without touching. The present applicant has disclosed the technology of an optical polarizing device having a dynamic pressure bearing in Japanese Patent Application Laid-Open Nos. 7-243439, 7-259849, 8-114219, 8-112471, and the like. ing.
[0004]
FIG. 9 is a cross-sectional view showing an example of a conventional optical deflection device provided with a dynamic pressure bearing. The dynamic pressure bearing is composed of a lower thrust plate fixed on a support base member, a fixed bearing member, an upper thrust plate, and a rotating bearing member that is rotatable with a rotating polygon mirror fixed. The rotary polygon mirror is driven and rotated by a drive motor including a rotary drive coil forming a stator having a magnet coil fixed on a base and a magnet forming a rotor integrally with the rotary polygon mirror.
[0005]
In a rotor unit having a rotary bearing member that rotates in opposition to a fixed bearing member fixed on a support base member, radial dynamic pressure rotation is performed between them in a radial dynamic pressure bearing portion. In addition, a thrust plate that forms a plane perpendicular to the axis of the fixed bearing member is fixed to both shaft ends of the fixed bearing member, and rotates in a form sandwiched between upper and lower thrust plates located above and below. In the rotary bearing member, thrust dynamic pressure rotation is performed in upper and lower thrust dynamic pressure bearing portions.
[0006]
Dynamic pressure generating grooves are formed in the radial dynamic pressure bearing portion and / or the upper and lower thrust dynamic pressure bearing portions. The wind generated by the high-speed rotation of the rotating unit is introduced into the dynamic pressure generating groove, and strong wind pressure is generated from the dynamic pressure generating groove to form a gap of several μm between the fixed member and the rotating unit. And the radial dynamic pressure bearing portion rotates at a high speed in a non-contact state.
[0007]
A gap of about 3 to 10 μm is formed between the inner cylindrical member, the lower thrust plate and the upper thrust plate, and the upper and lower surfaces of the radial dynamic pressure bearing portion and the inner peripheral surface of the fitting. Smooth high-speed rotation is maintained in a non-contact state floating in the air without touching the bearing.
[0008]
The rotating polygon mirror rotates with the rotation of the rotor, and the laser beam L emitted from the semiconductor laser deflects and scans the photosensitive member.
[0009]
[Problems to be solved by the invention]
The inner diameter of the rotary polygon mirror forms a radial dynamic pressure bearing portion while maintaining a predetermined minute gap with respect to the outer diameter of the opposed radial fixed shaft. The inner diameter of the rotary polygon mirror and the outer diameter of the radial fixed shaft are each manufactured within precise predetermined tolerances.However, if the two components within these tolerances are arbitrarily combined, the predetermined minute gap cannot be formed. Can not. For this reason, the inner diameter of the rotating polygon mirror and the outer diameter of the radial fixed shaft are measured and recorded, respectively, and from these measurement data, the optimal combination of the rotating polygon mirror and the radial fixed shaft constituting the predetermined minute gap is determined. Is selected.
[0010]
In addition, the tilt angle, reflectivity, thickness, etc. of the reflecting mirror surface on the side of the rotating polygon mirror are measured and recorded, and the optimum radial dynamic pressure bearing gap, upper thrust dynamic pressure bearing gap, lower thrust dynamic In order to maintain the gap between the pressure bearing portions, production management is performed based on combination information between components such that an optimal combination of a rotary polygon mirror and corresponding components can be obtained.
[0011]
Further, in addition to the information on the combination, a process history, a corresponding model, and the like are also recorded to control production.
[0012]
The measurement data, production management information, and the like are attached to a rotating polygon mirror with a management slip, flowed to the production process, and managed. However, there is a possibility that a defective assembly of the rotary polygon mirror may occur due to a wrong attachment of the management slip or a drop of the management slip.
[0013]
The present invention provides an optical deflecting device and a manufacturing method in which the optimal combination of a rotary polygon mirror and a radial fixed shaft is efficiently and accurately performed under production control in an assembling process of the above-described optical deflecting device, and stable rotational performance is obtained. The purpose is to provide.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, an optical deflecting device according to the present invention as set forth in claim 1 includes a rotating polygon mirror, a flange member for fixing the rotating polygon mirror, a rotor unit including a magnet for rotational driving, and the rotor unit. An optical deflector comprising: a dynamic pressure bearing comprising a rotatable bearing member and a fixed bearing member rotatably supported; a support base supporting the fixed bearing member; and a stator unit comprising a magnet coil for rotational drive. An information display unit for controlling the production of the rotary polygon mirror is formed on an outer surface of the rotary polygon mirror.
[0015]
The light deflecting device of the present invention according to claim 2, wherein the rotary polygon mirror, a flange member for fixing the rotary polygon mirror, a rotor unit including a magnet for driving rotation, and a rotary bearing rotatably supporting the rotor unit. An optical deflector comprising: a dynamic pressure bearing comprising a member and a fixed bearing member; a support base supporting the fixed bearing member; and a stator unit comprising a magnet coil for rotational driving. And an identification information display unit for managing the production of the light deflecting device and the rotary polygon mirror.
[0016]
According to a third aspect of the present invention, there is provided a method of manufacturing an optical deflector according to the present invention, wherein a rotary polygon mirror, a flange member for fixing the rotary polygon mirror, a rotor unit including a rotation driving magnet, and the rotor unit are rotatably supported. A method of manufacturing an optical deflection device, comprising: a dynamic pressure bearing comprising a rotating bearing member and a fixed bearing member; a support base supporting the fixed bearing member; and a stator unit comprising a magnet coil for rotational drive. On the outer surface of the polygon mirror, the assembly order of the light deflecting device, combination information of the components of the light deflecting device, inspection data in a production process, and the like are formed. The optical deflecting device is assembled while recording sequentially on a mirror.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of a light deflecting device and a method of manufacturing the light deflecting device of the present invention will be described with reference to the drawings.
[0018]
2. Description of the Related Art An image forming apparatus such as a laser printer has an image exposing device as a means for writing an image, and enters a laser beam based on read information into a rotating polygon mirror (polygon mirror) which rotates at a high speed of an optical deflecting device. Then, the reflected light is scanned and projected on the photoreceptor surface of the image carrier to record an image.
[0019]
[Image exposure apparatus]
FIG. 1 is a perspective view showing an embodiment of the image exposure apparatus 10, FIG. 2 is a plan view of the image exposure apparatus 10, and FIG.
[0020]
In these figures, 11 is an image exposure apparatus main body, 12 is an fθ lens, 13 is a second cylindrical lens, 14 is a cover glass, 15 is a semiconductor laser, 16 is a collimating lens, 17 is a first cylindrical lens, and 18 is timing detection. Reference numeral 19 denotes an index sensor for detecting synchronization, and reference numeral 20 denotes an optical deflecting device including a rotating polygon mirror (polygon mirror) 21 and the like.
[0021]
The light deflecting device 20 and the scanning optical system optical members 12 to 19 are arranged and fixed at predetermined positions in the image exposure device main body 11.
[0022]
The laser beam L emitted from the semiconductor laser 15 is converted into parallel light by the collimator lens 16, and then passes through the first cylindrical lens 17 of the first imaging optical system and enters the rotary polygon mirror 21. The reflected light from the rotary polygon mirror 21 passes through the second imaging optical system including the fθ lens 12 and the second cylindrical lens 13, passes through the cover glass 14, and forms a predetermined spot on the peripheral surface of the image carrier 1. Scanning is performed with a diameter and a predetermined pitch shifted in the sub-scanning direction. The main scanning direction has already been finely adjusted by an adjustment mechanism (not shown). In synchronization detection for each line, the light beam before the start of scanning is made incident on the index sensor 19 via the index mirror 18.
[0023]
In the optical deflector 20 which rotates at high speed using the rotating polygon mirror 21 as a rotating body, a high-speed rotation is performed by providing a dynamic pressure bearing between a rotating body (rotor unit) and a non-rotating body (stator unit).
[0024]
[Light deflection device]
FIG. 4 is a perspective view of the light deflecting device 20. On the printed circuit board 30, an integrated circuit IC, a capacitor C, a connector B and the like are arranged.
[0025]
FIG. 5A is a plan view of the light deflector 20 according to the present invention, and FIG. 5B is a cross-sectional view of the light deflector 20. FIG. 6 is an exploded sectional view of the light deflecting device 20, FIG. 6A is a sectional view of the rotor unit 20A, and FIG. 6B is a sectional view of the stator unit 20B.
[0026]
The light deflector 20 includes a rotor unit 20A and a stator unit 20B.
[0027]
・ Rotor unit 20A
The rotor unit 20A, which is a unit for rotating the light deflector 20 at high speed, includes a rotating polygon mirror 21, a cylindrical rotating bearing member (hereinafter, referred to as an outer cylindrical member) 22 around the rotation axis, and an outer cylindrical member 22. It comprises a flange member 23 whose outer peripheral surface is fixed and fitted on the inner peripheral surface of the rotating polygon mirror 21, a magnet 24 for rotational driving, and a rotor yoke 24A.
[0028]
The inner diameter of the outer cylinder member 22 is larger than the outer diameter of the fixed bearing member (hereinafter, referred to as the inner cylinder member) 26 of the stator unit 20B by an adjusted minute interval of several μm. The inner peripheral surface 22a of the outer cylinder member 22 and the outer peripheral surface 26a of the inner cylinder member 26 constitute a radial dynamic pressure bearing. The outer cylinder member 22 is preferably formed of ceramic such as alumina or silicon nitride in order to obtain stable rotation.
[0029]
The upper end surface 22b of the outer cylinder member 22 faces the thrust surface 27a of the upper thrust plate 27, and forms an upper thrust dynamic pressure bearing. Similarly, the lower end surface 22c of the outer cylindrical member 22 faces the thrust surface 28a of the lower thrust plate 28, and forms a lower thrust dynamic pressure bearing portion.
[0030]
Dynamic pressure generating grooves are formed on the thrust surfaces 27a and 28a of the opposed thrust dynamic pressure bearing portions. In the rotor unit 20A, the thrust rotation is performed in the thrust dynamic pressure bearing portion with respect to the main body fixing portion.
[0031]
Flange Member The flange member 23 is formed from a first cylindrical portion 231, a second cylindrical portion 232, and a disk portion 233.
[0032]
The first cylindrical portion 231 has an inner peripheral surface fitted and fixed to the outer peripheral surface of the outer cylindrical member 22, and an outer peripheral surface fitted and fixed to the inner peripheral surface 21 a of the rotary polygon mirror 21. The upper end surface of the second cylindrical portion 232 holds the lower end surface 21 b of the rotary polygon mirror 21. The disk portion 233 connects the first cylindrical portion 231 and the second cylindrical portion 232, and has the magnet 24 for rotational drive and the rotor yoke 24A fixed to the lower surface side.
[0033]
The flange member 23 and the rotary polygon mirror 21 are formed of the same material having the same coefficient of thermal expansion, for example, an aluminum alloy.
[0034]
The inner peripheral surface 21a formed at the center of rotation of the rotary polygon mirror 21 is fitted to the outer peripheral surface of the first cylindrical portion 231 of the flange member 23 to perform positioning in the radial direction. The lower end surface 21b of the rotary polygon mirror 21 is pressed against the upper end surface of the second cylindrical portion 232 to position in the thrust direction, and is fixed with an adhesive.
[0035]
・ Stator unit 20B
A cylindrical inner cylindrical member 26 is fixedly provided outside the cylindrical radial shaft portion 25a standing upright on the support base 25, and the radial shaft portion 25a and the inner cylindrical member 26 constitute a radial fixing member. . The inner cylinder member 26 is formed of a ceramic material such as alumina and silicon nitride.
[0036]
At the upper and lower ends of the inner cylindrical member 26, a disk-shaped upper thrust plate 27 and a lower thrust plate 28 are fixed in a direction substantially perpendicular to the radial shaft portion 25a of the support base 25, and a thrust fixing member is provided. Make up. The upper thrust plate 27 and the lower thrust plate 28 are formed of a ceramic material such as alumina and silicon nitride. The inner cylinder member 26, the upper thrust plate 27, and the lower thrust plate 28 are fixed to the radial shaft portion 25a by screws 25S.
[0037]
A printed circuit board 30 on which a plurality of magnet coils 29 are arranged on the same surface is attached to the upper surface of the base member 31. 29A is a stator yoke facing the magnet coil 29.
[0038]
The support base 25, the inner cylindrical member 26, the upper thrust plate 27, the lower thrust plate 28, the magnet coil 29, the stator yoke 29A, the printed circuit board 30, and the base member 31 are integrally formed to form the stator unit 20B.
[0039]
In the rotor unit 20A mounted on the stator unit 20B, the rotary polygon mirror 21 and the flange member 23 rotate accurately with respect to the rotation center of the outer cylindrical member 22, and the dynamic balance can be corrected to a minimum. Further, since distortion due to press-fitting, shrink fitting, or the like for fastening the outer cylindrical member 22 and the flange member 23 is not transmitted to the fixed portion between the rotary polygon mirror 21 and the flange member 23, the flatness of the rotary polygon mirror 21 and the temperature change In addition, displacement of the rotating polygon mirror 21 due to high-speed rotation is prevented.
[0040]
[Assembly process of optical deflector]
The assembling process of the light deflecting device 20 will be described below with reference to FIGS.
[0041]
(1) The rotating polygon mirror 21, the outer cylinder member 22, the magnet 24, and the rotor yoke 24A are fixed to the flange member 23 to assemble the rotor unit 20A.
[0042]
(2) The support base 25 is fixed to the base member 31.
(3) The thrust surface 28a of the lower thrust plate 28 is held upward, and the lower thrust plate 28 is fitted and mounted on the radial shaft portion 25a.
[0043]
(4) While holding the upper end surface of the inner cylinder member 26 so as to face upward, the inner cylinder member 26 is fitted to and mounted on the radial shaft portion 25a.
[0044]
(5) The inner peripheral surface 22a of the outer cylinder member 22 is fitted to and attached to the outer peripheral surface 26a of the inner cylinder member 26.
[0045]
(6) The thrust surface 27a of the upper thrust plate 27 is held downward, and the upper thrust plate 27 is fitted and mounted on the radial shaft portion 25a.
[0046]
(7) A screw 25S is screwed into a screw hole provided in the radial shaft portion 25a, and the lower thrust plate 28, the inner cylindrical member 26, and the upper thrust plate 27 are fixed to the radial shaft portion 25a.
[0047]
[Production management of optical deflector]
7A and 7B are an exploded sectional view of the rotor unit 20A, FIG. 7A is a sectional view of the rotary polygon mirror 21, and FIG. 7B is a sectional view of the flange member 23.
[0048]
In the assembly process of the optical deflector 20, the inner diameter of the inner peripheral surface 21a of the rotary polygon mirror 21 alone, the inclination of the mirror surface 21d with respect to the lower end surface 21b, the reflectance of the mirror surface 21d, and the like are precisely measured, and the tolerance is determined. Only the parts inside are managed so that they can be assembled.
[0049]
Also, the outer diameter of the outer peripheral surface 23a of the first cylindrical portion 231 of the flange member 23 fitted and fixed to the inner peripheral surface 21a of the rotary polygon mirror 21 is controlled such that only parts within tolerance can be assembled. I have.
[0050]
However, the inner peripheral surface 21a of the rotary polygon mirror 21 and the outer peripheral surface 23a of the first cylindrical portion 231 of the flange member 23 must be accurately fitted. In other words, when the inner peripheral surface 21a and the outer peripheral surface 23a are fitted to each other when they are tightly fitted, an internal stress is generated in the rotating polygon mirror 21 and the rotating polygon mirror 21 is deformed, or the rotating polygon mirror 21 is damaged by a change in environmental temperature. May be caused. If the gap at the time of fitting is large, the rotary polygon mirror 21 may not be securely fixed to the flange member 23, and may cause a positional shift.
[0051]
For this reason, the inner diameter of the inner peripheral surface 21a of the rotating polygon mirror 21 and the outer diameter of the outer peripheral surface 23a of the first cylindrical portion 231 of the flange member 23 are precisely measured for each component, and an appropriate interference fit is obtained. In order to achieve the above, it is necessary to select and manage an optimal pair combination of the rotary polygon mirror 21 and the flange member 23.
[0052]
FIG. 8A is a plan view of the rotary polygon mirror 21, and FIG. 8B is a cross-sectional view.
Production date (1), part number (2), applicable model (3), measured value of inner peripheral surface 21a, tilt angle of mirror surface 21d, reflectance, operator symbol, etc. An information display section for controlling the production of the rotary polygon mirror 21 such as a code (4) in which is written is formed.
[0053]
These information display sections are formed by alphanumeric characters, symbols, bar codes, two-dimensional codes, and the like.
[0054]
Further, an information display section for controlling the production of the light deflector 20 and the rotary polygon mirror 21 is formed on the upper end face 21c of the rotary polygon mirror 21. That is, an information display unit that manages assembly of the rotary polygon mirror 21 such as combination information (5) such as proper fitting with the outer cylinder member 22 corresponding to the measured value of the inner diameter of the inner peripheral surface 21a of the rotary polygon mirror 21 is provided. Formed.
[0055]
Further, on the upper end surface 21c of the rotary polygon mirror 21, the assembly order of the light deflecting device 20, the combination information of the components of the light deflecting device 20, the inspection data in the production process, and the like are formed, and the production management of the light deflecting device 20 is performed. The optical deflecting device 20 is assembled while sequentially recording information on the upper end surface 21c of the rotary polygon mirror 21.
[0056]
Further, based on the measured values of the inclination angle and the reflectance of the mirror surface 21d of the rotating polygon mirror 21, the rotating polygon mirror 21 is selected, and the image forming apparatus equipped with the rotating polygon mirror 21 and the light deflector 20 having the same shape is selected. Sort by model. That is, a high-precision rotating polygon mirror 21 is selected for a model that performs high-speed processing, and a rotating polygon mirror 21 that has a minimum necessary precision is selected for a model that performs low-speed processing. The applicable model is entered in the information display section on the upper end face 21c of the rotary polygon mirror 21.
[0057]
These information display sections are formed by laser marking, radiation irradiation, ink jet recording, stamping, scoring, labeling, and the like.
[0058]
Although the above-described rotary polygon mirror 21 is configured to be fitted to the outer peripheral surface 23a of the flange member 23, the present invention is also applicable to a configuration in which the rotary polygon mirror 21 is directly fitted to the outer cylindrical member 22. is there.
[0059]
Further, the present invention is not limited to the optical deflecting device, but is also applicable to a rotating device such as a motor that has a radial dynamic pressure bearing portion and a thrust dynamic pressure bearing portion and performs high-speed rotation.
[0060]
In each of the embodiments described above, the fixed central shaft portion is used as a radial fixing member, and the rotating unit is configured to rotate at high speed around the periphery through the radial dynamic pressure bearing. On the other hand, the present invention is similarly applied to a rotating device having a configuration in which a rotating unit including a central shaft portion rotates at a high speed via a radial dynamic pressure bearing.
[0061]
【The invention's effect】
Since the light deflecting device and the method for manufacturing the light deflecting device of the present invention are configured as described above, the following effects can be obtained.
[0062]
(1) In the light deflecting device of the present invention, the combination of the inner peripheral surface of the rotary polygon mirror and the outer peripheral surface of the flange member is easily selected by the information display section formed on the upper end surface of the rotary polygon mirror. The combination is quickly obtained, and a correctly fitted rotor unit is constructed.
[0063]
(2) In the light deflecting device of the present invention, the rotary polygon mirror and the flange member rotate accurately with respect to the rotation center of the outer cylindrical member, and the dynamic balance can be corrected to a minimum. Further, the flatness of the rotary polygon mirror, a change in temperature, and a shift of the rotary polygon mirror due to high-speed rotation are prevented. Further, distortion of the reflecting mirror surface of the rotating polygon mirror does not occur, and high-precision image exposure is achieved.
[0064]
(3) According to the method of manufacturing the optical deflector of the present invention, reliable information management can be achieved by the information display section formed on the upper end face of the rotary polygon mirror.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of an image exposure apparatus.
FIG. 2 is a plan view of the image exposure apparatus.
FIG. 3 is a cross-sectional view of the image exposure apparatus.
FIG. 4 is a perspective view of a light deflecting device.
FIG. 5 is a plan view and a cross-sectional view of the light deflecting device.
FIG. 6 is an exploded sectional view of the light deflecting device.
FIG. 7 is an exploded sectional view of the rotor unit.
FIG. 8 is a plan view and a sectional view of a rotary polygon mirror.
FIG. 9 is a cross-sectional view showing an example of a conventional optical deflection device provided with a dynamic pressure bearing.
[Explanation of symbols]
Reference Signs List 10 image exposure apparatus 11 image exposure apparatus main body 20 light deflector 20A rotor unit 20B stator unit 21 rotating polygon mirror (polygon mirror)
21a Inner peripheral surface 21c Upper end surface 21d Mirror surface 22 Rotation bearing member (outer cylinder member)
23 Flange member 23a Outer peripheral surface 25 Support base 26 Fixed bearing member (inner cylinder member)
27 Upper thrust plate 28 Lower thrust plate (1), (2), (3), (4), (5) Information display section

Claims (6)

A rotating polygonal mirror, a flange member for fixing the rotating polygonal mirror, a rotor unit including a magnet for rotational driving,
A hydrodynamic bearing comprising a rotating bearing member and a fixed bearing member rotatably supporting the rotor unit,
A support base for supporting the fixed bearing member, and a stator unit including a magnet coil for rotational driving;
An optical deflecting device, wherein an information display unit for controlling production of the rotary polygon mirror is formed on an outer surface of the rotary polygon mirror. A rotating polygonal mirror, a flange member for fixing the rotating polygonal mirror, a rotor unit including a magnet for rotational driving,
A hydrodynamic bearing comprising a rotating bearing member and a fixed bearing member rotatably supporting the rotor unit,
A support base for supporting the fixed bearing member, and a stator unit including a magnet coil for rotational driving;
An optical deflecting device, wherein an identification information display section for managing the production of the optical deflecting device and the rotating polygonal mirror is formed on an outer surface of the rotating polygonal mirror. A rotating polygonal mirror, a flange member for fixing the rotating polygonal mirror, a rotor unit including a magnet for rotational driving,
A hydrodynamic bearing comprising a rotating bearing member and a fixed bearing member rotatably supporting the rotor unit,
A method of manufacturing an optical deflector comprising: a support base supporting the fixed bearing member; and a stator unit including a magnet coil for rotational driving.
On the outer surface of the rotary polygon mirror, the assembly order of the light deflecting device, combination information of components of the light deflecting device, inspection data in a production process, and the like are formed, and the production management information of the light deflecting device is A method of manufacturing an optical deflecting device, comprising assembling the optical deflecting device while sequentially recording on a rotary polygon mirror. 4. The method according to claim 3, wherein the production management information is formed on the rotary polygon mirror by laser marking, radiation irradiation, ink jet recording, stamping, scoring, label attachment, or the like. The production management information formed on the rotating polygon mirror is a manufacturing date, a part number, an applicable model, a measured value of an inner peripheral surface, a tilt angle of a mirror surface, a reflectance, a measurer symbol, and the like. A method for manufacturing the optical deflection device according to claim 3. 4. The method according to claim 3, wherein the production management information formed on the rotary polygon mirror is an alphanumeric character, a symbol, a barcode, a two-dimensional code, or the like.

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