JP2003255257A - Light deflecting device and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light deflecting device which can obtain a stable rotation performance in high-speed rotation by miniaturizing a rotary polygon mirror and improving the attachment precision. <P>SOLUTION: A light deflecting device 30 is provided with a rotary unit 20 comprising a rotary polygon mirror 22, a flange member 23, a rotating bearing member 21 and a magnet 24, a dynamic pressure bearing comprising a rotating bearing member and a fixed bearing member which rotatably support the rotary unit 20, and a stator unit 10 comprising a support base body 11, a fixed bearing member 12 and a magnet coil 16. The flange member 23 comprises a first cylinder part 231 for fixing the outer peripheral surface of the rotating bearing member 21, a second cylinder part 232 for holding a lower end face 22c of the rotary polygon mirror 22, and a disk part 233 for connecting the first cylinder part 231 and the second cylinder part 232. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical deflector used for a bearing portion of a rotary polygon mirror of an optical deflector used for an image forming apparatus such as a laser beam printer, a laser copying machine, a laser facsimile and a bar code reader. The present invention relates to a device and a method for manufacturing a light deflection device.

[0002]

2. Description of the Related Art In an image forming apparatus such as a laser beam printer, laser light is incident on a rotating polygon mirror (polygon mirror) that rotates at high speed based on information read as a means for writing the image, and the reflected light is scanned. Then, the image is recorded by projecting it on the surface of the photoconductor.

In the case of low speed rotation, the rotary polygon mirror is used by being fixed directly to the rotary shaft of the drive motor, but at high speed rotation, the rotary polygon mirror is fixed to the outer cylinder member, and the inner cylinder fixedly arranged. Driving rotation is performed using a dynamic pressure bearing (air bearing) that rotates in a floating manner without touching the member. The applicant of the present invention discloses an optical polarization device having a dynamic pressure bearing in Japanese Patent Application Laid-Open Nos. 7-243437 and 7-2598.
49, JP-A-8-114219, and JP-A-8-121.
The technical disclosure is made by each publication such as No. 471.

FIG. 19 is a sectional view showing an example of a conventional optical deflector provided with a dynamic pressure bearing. The dynamic pressure bearing includes a lower thrust plate fixed on a supporting base member, a fixed bearing member (inner cylinder member), an upper thrust plate, and a rotary bearing member (outer cylinder member) which is rotatable by fixing a rotary polygon mirror. It is composed by. The rotary polygon mirror is a coil for rotation driving which constitutes a stator having a magnet coil fixed on a base,
It is driven and rotated by a drive motor composed of a rotating polygon mirror and a magnet that constitutes a rotor.

A rotor unit having an outer cylinder member that rotates in opposition to an inner cylinder member that is fixedly mounted on a support base member, has radial dynamic pressure rotation between them in a radial dynamic pressure bearing portion. In addition, a thrust that is perpendicular to the axis of the inner cylinder member is fixed to both ends of the inner cylinder member, and the outer cylinder that rotates while being sandwiched between the upper thrust plate and the lower thrust plate located above and below. The cylindrical member is rotated by thrust dynamic pressure in the upper and lower thrust dynamic pressure bearing portions.

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 rotary unit is introduced into the dynamic pressure generation groove, and a strong wind pressure is generated from the dynamic pressure generation groove to form a gap of several μm unit between the fixed member and the rotary unit. The resistance between them is reduced, and the radial dynamic pressure bearing portion is rotated at a high speed in a non-contact state.

A gap of about 3 to 10 μm is formed between the inner cylinder member, the lower thrust plate and the upper thrust plate, and the upper and lower surfaces of the radial shaft outer cylinder and the fitting inner peripheral surface. Smooth high-speed rotation is maintained in the non-contact state floating in the air without touching the dynamic pressure bearing.

The rotary polygon mirror also rotates as the rotor rotates, and the laser beam L emitted from the semiconductor laser deflects and scans toward the photosensitive member.

[0009]

The conventional optical deflector has the following problems.

(1) In the optical deflector having a structure in which the rotary polygon mirror is directly fixed to the outer cylinder member, when the magnet is directly bonded and fixed to the rotary polygon mirror, distortion occurs in the mirror surface of the rotary polygon mirror. Further, in the case of a small mirror, the magnet also has a small diameter and the driving torque is insufficient.

(2) In the optical deflector of the construction in which the rotary polygon mirror is indirectly fixed to the outer cylinder member of the radial dynamic pressure bearing through an intermediate member such as a flange member, the rotary polygon mirror, the flange member, and the outer cylinder member. Although it becomes possible to increase the fastening area with, the inner diameter of the rotary polygon mirror is increased because the outer diameter of the flange member and the inner diameter of the rotary polygon mirror are aligned.
Distortion of the mirror surface occurs due to insufficient rigidity, and the radius difference between the reflecting surfaces increases.

(3) When the flange member is fixed to the outer cylindrical member of the radial dynamic pressure bearing portion by press fitting or shrink fitting, the rotary polygon mirror is deformed by the internal stress of the flange member, and the flatness of the rotary polygon mirror decreases. Problems such as imbalance when the temperature rises occur.

(4) Due to high-speed rotation, vibration, etc., there is a risk of peeling of the adhesive between the rotary polygon mirror and the flange member.

The present invention prevents various problems in the above-mentioned optical deflecting device, reduces the size of the rotary polygonal mirror, and improves the mounting accuracy, so that the optical deflecting device and the optical deflecting device can obtain stable rotational performance at high speed. It aims at providing the manufacturing method of.

[0015]

The above objects can be achieved by the present invention described below.

(1) A rotary polygon mirror, a flange member for fixing the rotary polygon mirror, a rotor unit composed of a magnet for rotational driving, a rotary bearing member for rotatably supporting the rotor unit, and a fixed bearing member. In an optical deflector having a dynamic pressure bearing, a support base for supporting the fixed bearing member, and a stator unit including a rotation driving magnet coil, the flange member fixes the outer peripheral surface of the rotary bearing member. 1 cylindrical portion, a second cylindrical portion that holds the lower end surface of the rotary polygon mirror, and a disc portion that connects the first cylindrical portion and the second cylindrical portion to each other. Deflection device.

(2) A rotary polygonal mirror, a flange member for fixing the rotary polygonal mirror, a rotor unit including a magnet for rotational driving, a rotary bearing member for rotatably supporting the rotor unit, and a fixed bearing member. In an optical deflector having a dynamic pressure bearing, a support base that supports the fixed bearing member, and a stator unit that includes a rotation driving magnet coil, an opening formed in a rotation center of the rotary polygon mirror. The optical deflector is characterized in that the outer peripheral portion of the rotary bearing member is fitted and positioned.

(3) A fixed bearing member is fixed to a supporting base to form a stator unit, and the outer peripheral portion of the rotary bearing member into which the fixed bearing member is fitted is bored at the center of rotation of the rotary polygon mirror. A method for manufacturing an optical deflecting device, characterized in that the opening is fitted and positioned to form a rotor unit, and the optical deflecting device is assembled.

(4) A fixed bearing member is fixed to the support base to form a stator unit, and the first cylindrical portion of the flange member is fixed to the outer peripheral portion of the rotary bearing member on which the fixed bearing member is fitted, and the stator unit is rotated. An opening formed at the center of rotation of the rotary polygon mirror is fitted to the outer peripheral portion of the bearing member for positioning, and the lower end surface of the rotary polygon mirror is attached to the upper end surface of the second cylindrical portion formed on the flange member. A method for manufacturing an optical deflector, comprising holding and fixing a rotor unit to assemble the optical deflector.

(5) A rotary polygon mirror, a flange member for fixing the rotary polygon mirror, a rotor unit composed of a magnet for rotational driving, a rotary bearing member for rotatably supporting the rotor unit, and a fixed bearing member. In an optical deflector having a dynamic pressure bearing, a support base that supports the fixed bearing member, and a stator unit that includes a magnet coil for rotational driving, the facing surfaces of the rotary polygon mirror and the flange member are bonded and fixed. A first adhesive part and a second adhesive part connected to an end of the first adhesive part and forming an angle with the first adhesive part
An optical deflecting device, wherein an adhesive portion is provided on the flange member and the rotary polygon mirror.

(6) A fixed bearing member is fixed to the support base to form a stator unit, and the first cylindrical portion of the flange member is fixed to the outer peripheral portion of the rotary bearing member into which the fixed bearing member is fitted, and the rotation is performed. An opening formed at the center of rotation of the rotary polygon mirror is fitted to the outer peripheral portion of the bearing member for positioning, and the lower end surface of the rotary polygon mirror and the second portion of the flange member are positioned.
A first adhesive portion that adheres and fixes the upper end surface of the cylindrical portion, and a second adhesive portion that has an angle with the adhesive surface that connects to the end portion of the first adhesive portion
The rotary polygon mirror is bonded and fixed to the flange member by an adhesive portion, and the lower end surface of the rotary polygon mirror is held and fixed to the upper end surface of the second cylindrical portion to form a rotor unit, and an optical deflector is assembled. A method for manufacturing an optical deflecting device, comprising:

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of an optical deflecting device and an image forming apparatus of the present invention will be described with reference to the drawings.

[Image Forming Apparatus] FIG. 1 is an overall configuration diagram of an image forming apparatus equipped with an automatic document feeder DF and an image reading apparatus (scanner) SC.

The image forming apparatus main body A shown in the figure includes an image forming section 1, an image processing section 2, an image exposure apparatus (image writing section) 3, a high voltage power source section 4, a sheet feeding / conveying section 5, a fixing device 6, and a sheet discharging section. The unit 7 includes a re-conveying unit (ADU) 8 for automatic double-sided copying.

A paper discharge tray 7C or a paper post-processing device (not shown) can be connected to the paper discharge unit 7 side in the upper left portion of the image forming apparatus main body A shown in the drawing.

The document placed on the document table of the automatic document feeder DF with the first side facing upward is the image reading device S.
An image of one side or both sides of the original is read by the optical system of C and read by the image sensor CCD.

The analog signal photoelectrically converted by the image sensor CCD is subjected to analog processing, A / D conversion, shading correction, image compression processing, etc. in the image processing section 2 and then sent to the image exposure device 3.

In the image exposure device 3, the output light from the semiconductor laser is applied to the image carrier 1A (photosensitive drum) of the image forming section 1 to form a latent image. The image carrier 1A is O
A photoconductor drum having a photoconductive layer of PC, Se, or the like. The image carrier 1A is driven and rotated in the arrow direction. In the image forming unit 1, processes such as charging, exposure, development, transfer, separation, cleaning, etc. are performed, and the image is transferred onto the paper S conveyed from the paper feed conveying unit 5. Paper S carrying an image
Is fixed by the fixing device 6 and is discharged from the paper discharge unit 7 to the paper discharge tray 7C. Alternatively, the single-sided image processed sheet S sent to the re-conveyance unit 8 by the sheet discharge path switching plate 7A is
After the double-sided image processing is performed again in the image forming unit 1, the paper is discharged to the paper discharge tray 7C by the paper discharge roller 7B of the paper discharge unit 7.

In FIG. 1, on the right side inside the image forming apparatus main body A, the sheet feeding cassette 5 of the sheet feeding conveying section 5 is located below the image forming apparatus main body A in the height direction with the image forming section 1 as the center.
A is provided with a fixing device 6 and a paper discharge unit 7 on the upper side.
With this vertical arrangement, a substantially vertical sheet conveyance path is formed. The sheet S sent out from the sheet feeding cassette 5A is conveyed along the vertically upper sheet conveying path and is discharged to the outside of the image forming apparatus main body A.

A sheet conveying path by the re-conveying section 8 is formed substantially parallel to the vertical sheet conveying path.
By forming the above-described vertical paper transport path, the shortest paper transport path from the paper feed cassette 5A to the paper discharge unit 7 is configured.

Embodiments of a light deflecting device and an image exposing device according to the present invention will be described below with reference to the drawings.

[Optical Deflection Device] In an image forming apparatus such as a laser printer, a laser beam is incident on a rotating polygon mirror (polygon mirror) of the optical deflection device, which rotates at high speed, based on information read by the image writing means. Then, the reflected light is scanned and projected on the photoconductor surface of the image carrier 1A to record an image.

FIG. 2 is a sectional view showing an embodiment of the image exposure device 3, FIG. 3 is a perspective view of the image exposure device 3, and FIG. 4 is a plan view of the image exposure device 3.

In these figures, 30 is an optical deflecting device comprising a rotating polygon mirror (polygon mirror) 22 and the like, 31 is an image exposure apparatus main body, 32 is an fθ lens, 33 is a second cylindrical lens, 34 is a cover glass and 35 Is a semiconductor laser, 36 is a collimator lens, 37 is a first cylindrical lens, 38 is an index mirror for timing detection, and 39 is an index sensor for synchronization detection.

The light deflecting device 30 and the scanning optical system optical members 32 to 39 are arranged and fixed at predetermined positions in the main body 31 of the image exposure device.

The laser beam L emitted from the semiconductor laser 35 is converted into parallel light by the collimator lens 36, then passes through the first cylindrical lens 37 of the first imaging optical system and enters the rotary polygon mirror 22. The reflected light of the rotary polygon mirror 22 passes through the second imaging optical system including the fθ lens 32 and the second cylindrical lens 33, and the cover glass 3
After passing through 4, the peripheral surface of the image carrier 1A is scanned with a predetermined spot diameter and a predetermined pitch shift in the sub-scanning direction.
The main scanning direction has already been finely adjusted by an adjusting mechanism (not shown). In the synchronous detection for each line, the light beam before the start of scanning is made incident on the index sensor 39 via the index mirror 38.

In the optical deflector which rotates at high speed by using the rotary polygon mirror 22 as a rotating body, a dynamic pressure bearing is provided between the rotating body (rotor unit) and the non-rotating body (stator unit) for high speed rotation.

[First Embodiment of Optical Deflection Device] FIG. 5
FIG. 5A is a plan view showing a first embodiment of an optical deflecting device 30 of the present invention, and FIG. 5B is a sectional view of the optical deflecting device 30. FIG. 6 shows an exploded sectional view of the light deflector 30.

-Stator unit FIG. 6B is a sectional view of the stator unit 10.

Support substrate (hereinafter referred to as base member) 11
On the outside of the cylindrical radial shaft portion 11A that stands upright,
Cylindrical fixed bearing member (hereinafter referred to as inner cylinder member)
12 is fixedly installed, and the radial shaft portion 11A and the inner tubular member 12 constitute a radial fixing member. The inner cylinder member 12 is formed of a ceramic material such as alumina or silicon nitride.

At the upper and lower ends of the inner cylindrical member 12, a disk-shaped upper thrust fixing member (hereinafter referred to as an upper thrust plate) 13 and a lower thrust fixing member (in the direction substantially perpendicular to the radial shaft portion 11A). Hereinafter, referred to as a lower thrust plate) 14 is fixed to form a thrust fixing member. Upper thrust plate 1
3 and the lower thrust plate 14 are made of a ceramic material such as alumina or silicon nitride. The inner cylinder member 12, the upper thrust plate 13, and the lower thrust plate 14 are fixed to the radial shaft portion 11A by screws 15 after being mounted on the radial shaft portion 11A.

A printed circuit board 17 having a plurality of magnet coils 16 arranged on the same plane is mounted on the flat surface of the base member 11. Reference numeral 18 is a stator yoke that faces the magnet coil 16.

The base member 11, the inner cylinder member 12, the upper thrust plate 13, the lower thrust plate 14, the magnet coil 16, the printed circuit board 17, and the stator yoke 18 are integrated to form the stator unit 10.

・ Rotor unit FIG. 6A is a sectional view of the rotor unit 20.

The rotor unit 20, which is a unit for performing high-speed rotation of the optical deflector 30, includes a cylindrical rotary bearing member (hereinafter referred to as an outer cylinder member) 21, a rotary polygon mirror 22, and an outer cylinder, which has a rotation axis as a center. Flange member 2 fixed to member 21
3, the rotary polygon mirror 2 supported and fixed to the flange member 23
2. A magnet 24 for driving rotation and a rotor yoke 26.

The inner diameter of the outer cylinder member 21 is larger than the outer diameter of the inner cylinder member 12 by the adjusted minute interval of several μm. The inner peripheral surface 21 a of the outer cylindrical member 21 and the outer peripheral surface 1 of the inner cylindrical member 12
The radial dynamic pressure bearing portion is constituted by 2a. It is preferable that the outer cylinder member 21 is formed of ceramic such as alumina or silicon nitride in order to obtain stable rotation.

The upper end surface 21b of the outer tubular member 21 faces the thrust surface 13a of the upper thrust plate 13 to form an upper thrust dynamic pressure bearing portion. Similarly, the lower end surface 21c of the outer cylinder member 21 faces the thrust surface 14a of the lower thrust plate 14 and constitutes a lower thrust dynamic pressure bearing portion.

Dynamic pressure generating grooves are formed on the thrust surfaces 13a and 14a of the thrust dynamic pressure bearing portions facing each other. In the rotor unit 20, thrust rotation is performed in the thrust dynamic pressure bearing portion with respect to the main body fixed portion.

Flange member The flange member 23 includes a first cylindrical portion 231 and a second cylindrical portion 2
32 and a disc portion 233.

The first cylindrical portion 231 is fitted on and fixed to the outer peripheral surface (outer peripheral portion) 21d of the outer cylindrical member 21.
And an outer peripheral surface 23b fitted and fixed to the inner peripheral surface (opening) 22a of the rotary polygon mirror 22. Second cylindrical portion 232
Is the upper end surface 2 that holds the lower end surface 22c of the rotary polygon mirror 22.
3c. The disk portion 233 connects the first cylindrical portion 231 and the second cylindrical portion 232, and fixes the rotation driving magnet 24 and the rotor yoke 26 on the lower surface side.

The flange member 23 and the rotary polygon mirror 22 are
It is formed of the same material having the same coefficient of thermal expansion, for example, an aluminum alloy.

An outer peripheral surface 21d of the outer cylindrical member 21 has an inner peripheral surface (opening) 22 formed at the center of rotation of the rotary polygon mirror 22.
Fit a and position in the radial direction. The lower end surface 22c of the rotary polygon mirror 22 is pressed against the upper end surface 23c of the second cylindrical portion 232 and pressed by the leaf spring member 25 to perform positioning in the thrust direction.

The leaf spring member 25 includes a hollow disc portion fitted and inserted in the groove portion 23d of the flange member 23, and a plurality of (8 in FIG. 5) tongue pieces radially protruding from the outer periphery of the hollow disc portion. Consists of.

The leaf spring member 25 is in the form of a thin plate having elasticity and is formed by pressing a stainless steel plate, a phosphor bronze plate, a beryllium copper plate or the like. The tongue piece is bent and elastically deformable.

A groove 23d is formed on the side surface of the upper end of the first cylindrical portion 231. The tongue piece of the leaf spring member 25 fitted in the groove 23d presses the bottom surface of the recess 22b of the rotary polygon mirror 22 to bring the rotary polygon mirror 22 into close contact with the flange member 23. By pressing the rotary polygon mirror 22 with the leaf spring member 25, the rotary polygon mirror 22 is moved to the flange member 23.
When fixed to the rotary polygonal mirror 22, excessive stress is not applied to the rotary polygonal mirror 22, and it is possible to prevent the rotary polygonal mirror 22 from being deformed.

The rotor unit 20 is replaced with the stator unit 1
After mounting to 0, the radial shaft portion 11A of the base member 11
The optical deflector is assembled by inserting the upper thrust plate 13 into the upper end of the inner cylindrical member 12 and bringing it into contact with the upper end surface of the inner cylindrical member 12 and fixing it with the screw 15.

In the optical deflector 30, the rotary polygon mirror 22 having the outer surface 22d as a mirror surface is fixed to the outer peripheral surface 21d of the outer cylinder member 21 via the flange member 23, and the rotary polygon mirror 22 is fixed.
Is adjusted and attached so that the center of the rotor and the center of rotation of the rotor unit 20 coincide with each other.

The rotor unit 20 assembled by the above-mentioned steps is arranged with respect to the rotation center of the outer cylinder member 21.
The rotary polygon mirror 22 and the flange member 23 rotate accurately,
Dynamic balance can be modified to a minimum. Further, since distortion due to press fitting, shrink fitting, etc. for fastening the outer cylinder member 21 and the flange member 23 is not transmitted to the fixed portion of the rotary polygon mirror 22 and the flange member 23, the flatness of the rotary polygon mirror 22 and
The displacement of the rotary polygon mirror 22 due to temperature change and high speed rotation is prevented.

[Second Embodiment] FIG. 7 is a sectional view showing a second embodiment of the optical deflecting device of the present invention. In addition,
Regarding the reference numerals used in the drawings, the portions having the same functions as those in the first embodiment are given the same reference numerals.
Further, the points different from the first embodiment will be described.

In this embodiment, the groove 23d formed in the first cylindrical portion 231 of the flange member 23, the recess 22b on the upper surface side of the rotary polygon mirror 22, and the leaf spring member 25 are not provided.

The first cylindrical portion 231 of the flange member 23 is fixed to the outer peripheral surface 21d of the outer cylindrical member 21. Further, the outer peripheral surface 23b of the first cylindrical portion 231 is fitted with the inner peripheral surface 22a formed at the center of rotation of the rotary polygon mirror 22 for radial positioning. Upper end surface 23c of the second cylindrical portion 232.
On the thin-film adhesive layer a applied to the
The lower end surface 22c is pressed and joined to be integrated, and the thrust direction is positioned.

The rotor unit 20 assembled by the above-mentioned steps is composed of a rotary polygon mirror 22 and a flange member 23.
The stress applied to the adhesion portion of the rotary polygon mirror 22 is reduced, and the peeling of the adhesive or the distortion of the rotary polygon mirror 22 due to the adhesion does not occur, and high-quality image formation is achieved.

Further, the flange member 23 and the rotary polygon mirror 22
By forming and with materials having the same coefficient of thermal expansion, the difference in the amount of thermal expansion of the fixed portion between the flange member 23 and the rotary polygon mirror 22 becomes small, and the distortion of the rotary polygon mirror 22 and the decrease in adhesive strength are prevented. .

[Third Embodiment] FIG. 8 is a sectional view showing a third embodiment of the optical deflector of the present invention. In addition,
Regarding the reference numerals used in the drawings, the same reference numerals are given to the portions having the same functions as those in FIG. Further, the points different from FIG. 5 will be described.

The flange member 23 of this embodiment has an upper end portion 23g of the cylindrical portion 234 that abuts the lower end surface 22c of the rotary polygon mirror 22, and an inner peripheral surface 23a fixed to the outer peripheral surface 21d of the outer cylindrical member 21. With.

The hollow disk portion of the leaf spring member 25 is fitted and fixed in the groove portion 21e of the outer cylinder member 21. The tongue portion of the leaf spring member 25 presses the upper surface of the recess 22b of the rotary polygon mirror 22 to bring the rotary polygon mirror 22 into close contact with the upper end surface 23c of the flange member 23.

By pressing the upper surface of the concave portion 22b provided in the rotary polygon mirror 22 with the leaf spring member 25, the axial length of the outer cylindrical member 21 constituting the thrust dynamic pressure bearing portion can be shortened. is there. Further, when the rotary polygon mirror 22 is fixed to the outer cylinder member 21 by pressing the rotary polygon mirror 22 with the leaf spring member 25, excessive stress is not applied to the rotary polygon mirror 22, and the rotary polygon mirror 22 is prevented. It is possible to prevent the deformation of 22.

In the rotor unit 20 assembled by the above-mentioned steps, the rotary polygon mirror 2 is assembled by directly positioning the rotary polygon mirror 22 on the outer peripheral portion of the outer cylinder member 21.
The eccentricity of 2 is reduced, and the mutual difference in radius of the plurality of reflecting mirror surfaces of the rotary polygon mirror 22 is minimized.

Further, since the outer cylinder member 21 is made of ceramic, the outer diameter dimension and roundness of the outer cylinder member 21 can be processed with high accuracy, and the eccentricity of the rotary polygon mirror 22 can be further reduced. is there. Further, even if the gap at the fitting portion between the outer cylinder member 21 and the rotary polygonal mirror 22 is made small, the inner peripheral surface 22a of the rotary polygonal mirror 22 becomes the outer peripheral surface 21d of the outer cylinder member 21 when the rotor unit 20 is assembled. It is possible to insert without getting caught in.
Further, the rotary polygon mirror 22 can be fixed to the outer cylinder member 21 with high accuracy and without eccentricity in a short time without using a special tool.

[Fourth Embodiment] FIG. 9 is a sectional view showing a fourth embodiment of the optical deflector according to the present invention. In addition,
Regarding the reference numerals used in the drawings, the portions having the same functions as those in FIGS. 5 and 6 are given the same reference numerals. Also, the points different from those in FIGS. 5 and 6 will be described.

In the optical deflecting device of this embodiment, the inner peripheral surface 22a formed at the center of rotation of the rotary polygon mirror 22 and the outer peripheral surface 21d of the outer cylindrical member 21 are fitted to each other in the radial direction. The positioning is done.

The inner peripheral surface 23a of the flange member 23 is fixed to the outer peripheral surface 21d of the outer cylindrical member 21. Flange member 2
The upper end surface 23c of the second cylindrical portion 232 of the third rotating mirror 3
It abuts on the lower end surface 22c of No. 2. The flange member 23
The upper end surface and the outer peripheral surface of the first cylindrical portion 231 are not in contact with the rotary polygon mirror 22.

A groove portion 21e is formed in the upper portion of the outer peripheral surface 21d of the outer cylindrical member 21, and a concave portion 2 is formed in the upper portion of the rotary polygon mirror 22.
2b is formed. The hollow disc portion of the leaf spring member 25 is fitted and fixed in the groove portion 21e of the outer tubular member 21. The tip of the tongue piece of the leaf spring member 25 has a rotary polygon mirror 2
The upper surface of the second concave portion 22b is pressed to bring the rotary polygon mirror 22 into close contact with the upper end surface 23c of the flange member 23.

Since the rotary polygon mirror 22 and the first cylindrical portion 231 of the flange member 23 form a gap and do not interfere with each other in a non-contact manner, the distortion of the rotary polygon mirror 22 does not occur.

In the rotor unit 20 assembled by the above process, the outer cylinder member 21 and the flange member 23.
The distortion of the fastening with the rotary polygon mirror 22 and the flange member 23
Since it is not transmitted to the fixed portion of the rotary polygonal mirror 22, the flatness of the reflecting mirror surface of the rotary polygonal mirror 22 is prevented, the rotary polygonal mirror 22 is prevented from being displaced due to temperature change and high speed rotation, and the eccentricity of the rotary polygonal mirror 22 is reduced. It

[Fifth Embodiment] FIG. 10 is a sectional view showing a fifth embodiment of the optical deflector of the present invention. In addition, about the code | symbol used in drawing, the same code | symbol is attached | subjected to the part which has the same function as FIG. Further, the points different from FIG. 9 will be described.

In this embodiment, the rotary polygon mirror 22 is moved by the plate spring member 25 to the second cylindrical portion 23 of the flange member 23.
Instead of being pressed into contact with 2, the upper end surface 23 of the second cylindrical portion 232.
c and the lower end surface 22c of the rotary polygon mirror 22 are bonded and fixed by an adhesive layer a.

In the rotor unit 20 assembled by the above process, the stress applied to the bonding portion is reduced, the peeling of the adhesive agent or the distortion of the rotary polygon mirror 22 due to the bonding does not occur, and the number of parts can be reduced by the bonding. It will be possible.

[Sixth Embodiment] FIG. 11 is a sectional view showing a sixth embodiment of the optical deflector according to the present invention. Regarding the reference numerals used in the drawings, the portions having the same functions as those in FIG. 10 are given the same reference numerals. Also, FIG.
Differences from 0 will be described.

The upper end surface 2c has a shape in which the upper end surface 23c of the second cylindrical portion 232 projects from the upper end surface of the first cylindrical portion 231 of the flange member 23 fixed to the outer peripheral portion of the outer cylindrical member 21.
3c is in contact with and fixed to the lower end surface 22c of the rotary polygon mirror 22.

In the rotor unit 20 assembled by the above steps, the rotary polygon mirror 22 is prevented from interfering with the fixed portion of the outer cylinder member 21 of the flange member 23 without making the rotary polygon mirror 22 into a complicated shape. It is possible to prevent damage to parts during assembly.

[Seventh Embodiment] FIG. 12A is a sectional view showing a seventh embodiment of the optical deflecting device of the present invention.
2B is an enlarged cross-sectional view of the bonded portion between the rotary polygon mirror 22 and the flange member 23. In addition, about the code | symbol used in drawing, the same code | symbol is attached | subjected to the part which has the same function as FIG. Further, the points different from FIG. 7 will be described.

In this embodiment, the rotary polygon mirror 2
2 lower end surface 22c and the cylindrical portion 234 of the flange member 23.
A first adhesive portion b1 for adhering and fixing two flat surfaces to the upper end surface 23g of the above, and a second adhesive portion b2 connected to the end portion of the first adhesive portion b1 and extending in the vertical direction of the adhesive surface.

The second adhesive portion b2 straddles the vertical wall portion 22f of the stepped portion formed on the lower end surface 22c of the rotary polygon mirror 22 and the vertical wall portion 23f of the upper end surface 23g of the cylindrical portion 234 of the flange member 23. Formed.

In the rotor unit 20 assembled by the above process, the rotating multi-face is composed of the two surfaces of the first adhesive portion b1 formed on the horizontal plane and the second adhesive portion b2 formed on the vertical surface. By bonding the mirror 22 and the flange member 23 together, the bonding becomes strong and the peeling of the adhesive is prevented.

[Eighth Embodiment] FIG. 13A is a sectional view showing an eighth embodiment of the optical deflecting device of the present invention.
3B is an enlarged cross-sectional view of the bonded portion between the rotary polygon mirror 22 and the flange member 23. In addition, about the code | symbol used in drawing, the same code | symbol is attached | subjected to the part which has the same function as FIG. Further, the points different from FIG. 7 will be described.

The flange member 23 includes the first cylindrical portion 231 for fixing the outer peripheral surface 21d of the outer cylindrical member 21, and the rotary polygon mirror 2.
The second cylindrical portion 232 that holds the lower end surface 22c of the second
Disk part 2 connecting the cylindrical part 231 and the second cylindrical part 232.
And 33.

In this embodiment, the rotary polygon mirror 2 is used.
Lower end surface 22c of the second cylindrical portion 2 of the flange member 23
A first adhesive portion c1 that adheres and fixes two planes to the upper end surface 23c of 32 and a second adhesive portion c2 that is connected to the end portion of the first adhesive portion c1 and extends in the vertical direction of the adhesive surface are formed.

The second adhesive portion c2 has a stepped vertical wall portion 22f formed on the lower end surface 22c of the rotary polygon mirror 22 and a vertical wall portion 23f of the upper end surface 23c of the second cylindrical portion 232 of the flange member 23. It is formed over.

In the rotor unit 20 assembled by the above process, the rotating multi-face is composed of the two surfaces of the first adhesive portion c1 formed on the horizontal plane and the second adhesive portion c2 formed on the vertical surface. By bonding the mirror 22 and the flange member 23 together, the bonding becomes strong and the peeling of the adhesive is prevented.

[Ninth Embodiment] FIG. 14A is a sectional view showing a ninth embodiment of the optical deflecting device of the present invention.
4B is an enlarged cross-sectional view of the bonded portion between the rotary polygon mirror 22 and the flange member 23. In addition, about the code | symbol used in drawing, the same code | symbol is attached | subjected to the part which has the same function as FIG. Further, the points different from FIG. 13 will be described.

In this embodiment, the second cylindrical portion 2
An annular groove portion 22g is formed on both sides of the lower end surface 22c of the rotary polygon mirror 22 facing the upper end surface 23c of 32.

A first bonding portion d1 for bonding and fixing two planes of the lower end surface 22c of the rotary polygon mirror 22 and the upper end surface 23c of the second cylindrical portion 232 of the flange member 23 is formed. Also,
A second adhesive portion d2 that is connected to the end of the first adhesive portion d1 and extends in the vertical direction of the adhesive surface is formed.

The second adhesive portion d2 is a vertical wall portion of a groove portion 22g formed on both sides of the lower end surface 22c of the rotary polygon mirror 22, and
It is formed so as to straddle the vertical wall portion 23f of the upper end surface 23c of the second cylindrical portion 232 of the flange member 23.

In the rotor unit 20 assembled by the above process, the rotating multi-face is composed of the two surfaces of the first adhesive portion d1 formed on the horizontal plane and the second adhesive portion d2 formed on the vertical surface. By bonding the mirror 22 and the flange member 23 together, the bonding becomes strong and the peeling of the adhesive is prevented.

[Tenth Embodiment] FIG. 15A is a sectional view showing a tenth embodiment of an optical deflector according to the present invention.
FIG. 15B is an enlarged cross-sectional view of the bonded portion between the rotary polygon mirror 22 and the flange member 23. In addition, about the code | symbol used in drawing, the same code | symbol is attached | subjected to the part which has the same function as FIG. Further, the points different from FIG. 13 will be described.

In this embodiment, the second cylindrical portion 2
An annular groove 22h is bored in the lower end surface 22c of the rotary polygon mirror 22 facing the upper end surface 23c of 32 at substantially the center thereof.

A first bonding portion e1 for bonding and fixing the two flat surfaces of the lower end surface 22c of the rotary polygon mirror 22 and the upper end surface 23c of the second cylindrical portion 232 of the flange member 23 is formed. Also,
Two second adhesive portions e2 connected to both ends of the first adhesive portion e1 and extending in the vertical direction of the adhesive surface are formed. Further, a third adhesive portion e3 that is connected to almost the center of the first adhesive portion e1 and fills the groove portion 22h is formed.

The second adhesive portion e2 is formed over the vertical wall portions formed on both sides of the upper end surface 23c of the second cylindrical portion 232 and the lower end surface 22c of the rotary polygon mirror 22. The third adhesive portion e3 is filled in the groove portion 22h of the rotary polygon mirror 22 to strengthen the adhesion.

In the rotor unit 20 assembled by these steps, the first adhesive portion e1 formed on the horizontal plane, the second adhesive portion e2 formed on the vertical surface, and the third adhesive portion e2 formed on the vertical surface.
By adhering the rotary polygon mirror 22 and the flange member 23 by the three adhering portions with the adhering portion e3, the adhering becomes strong and the peeling of the adhesive is prevented.

[Eleventh Embodiment] FIG. 16A is a sectional view showing the eleventh embodiment of the optical deflecting device of the present invention.
FIG. 16B is an enlarged cross-sectional view of the bonded portion between the rotary polygon mirror 22 and the flange member 23. Regarding the reference numerals used in the drawings, the portions having the same functions as those in FIGS. 11 and 13 are given the same reference numerals. Moreover, the points different from FIGS. 11 and 13 will be described.

In this embodiment, the rotary polygon mirror 2
The opening 22a bored at the center of rotation 2 and the outer peripheral surface 21d of the outer tubular member 21 are fitted and positioned.

The inner peripheral surface 23a of the first cylindrical portion 231 of the flange member 23 and the outer peripheral surface 21d of the outer cylindrical member 21 are fixed by press fitting or the like.

Two opposing flat surfaces of the lower end surface 22c of the rotary polygon mirror 22 and the upper end surface 23c of the second cylindrical portion 232 of the flange member 23 are bonded and fixed by the first bonding portion c1.
Further, the vertical wall portion 23f of the second cylindrical portion 232 of the flange member 23 and the vertical wall portion 23f that connects the lower end surface 22c of the rotary polygon mirror 22 to the flat surface portion that faces the upper end surface 23c of the flange member 23 are The two adhesive portions c2 are adhesively fixed.

In the rotor unit 20 assembled by the above process, the rotating multi-face is composed of the two surfaces of the first adhesive portion c1 formed on the horizontal plane and the second adhesive portion c2 formed on the vertical surface. By bonding the mirror 22 and the flange member 23 together, the bonding becomes strong and the peeling of the adhesive is prevented.

[Twelfth Embodiment] FIG. 17A is a sectional view showing the twelfth embodiment of the optical deflecting device of the present invention.
FIG. 17B is an enlarged cross-sectional view of the bonded portion between the rotary polygon mirror 22 and the flange member 23. Regarding the reference numerals used in the drawings, the portions having the same functions as those in FIGS. 14 and 16 are given the same reference numerals. Moreover, the points different from those in FIGS. 14 and 16 will be described.

This embodiment is a combination of the ninth embodiment shown in FIG. 14 and the eleventh embodiment shown in FIG.

The arrangement and positioning of the outer cylinder member 21, the rotary polygon mirror 22, and the flange member 23 are the same as in FIG. The first adhesive portion d1 and the second adhesive portion d2 for adhering the rotary polygon mirror 22 and the flange member 23 are the ninth adhesive portion shown in FIG.
This is the same as the embodiment.

Between the upper end surface 23c of the second cylindrical portion 232 having a height higher than that of the first cylindrical portion 231 of the flange member 23, and the lower end surface 22c of the rotary polygon mirror 22 facing the upper end surface 23c. The first adhesive portion d1 is formed on.

Further, the groove portions 22g are bored on both sides of the upper end surface 23c of the second cylindrical portion 232, and the side wall of the groove portion 22g is connected to the side wall of the second cylindrical portion 232 of the flange member 23. To form.

In the rotor unit 20 assembled by the above process, the rotating multi-face is composed of the two surfaces of the first adhesive portion d1 formed on the horizontal plane and the second adhesive portion d2 formed on the vertical surface. By bonding the mirror 22 and the flange member 23 together, the bonding becomes strong and the peeling of the adhesive is prevented.

[Thirteenth Embodiment] FIG. 18A is a sectional view showing a thirteenth embodiment of an optical deflector according to the present invention.
FIG. 18B is an enlarged cross-sectional view of the bonded portion between the rotary polygon mirror 22 and the flange member 23. Regarding the reference numerals used in the drawings, the portions having the same functions as those in FIGS. 15 and 16 are given the same reference numerals. Moreover, the points different from those in FIGS. 15 and 16 will be described.

This embodiment is similar to the tenth embodiment shown in FIG.
This embodiment is combined with the eleventh embodiment shown in FIG.

The arrangement and positioning of the outer cylinder member 21, the rotary polygon mirror 22 and the flange member 23 are the same as in FIG. The first adhesive portion d1 and the second adhesive portion d2 for adhering the rotary polygon mirror 22 and the flange member 23 are the first adhesive portions shown in FIG.
This is the same as the embodiment of No. 0.

Between the upper end surface 23c of the second cylindrical portion 232 having a height higher than that of the first cylindrical portion 231 of the flange member 23, and the lower end surface 22c of the rotary polygon mirror 22 facing the upper end surface 23c. Then, the first adhesive portion e1 is formed.

Further, two second adhesive portions e2 connected to both ends of the first adhesive portion e1 and extending in the vertical direction of the adhesive surface are formed. Further, a third adhesive portion e3 that is connected to almost the center of the first adhesive portion e1 and fills the groove portion 22h is formed.

In the rotor unit 20 assembled by these steps, the first adhesive portion e1 formed on a horizontal plane, the second adhesive portions e2 formed on both sides of the first adhesive portion e1, and the first adhesive portion e2. By adhering the rotary polygon mirror 22 and the flange member 23 to each other by the three adhering portions including the third adhering portion e3 formed at the central portion of the adhering portion e1, the adhering becomes strong and the adhesive peeling is prevented.

The present invention is not limited to the optical deflecting device, but can be applied to a rotating device such as a motor having a radial dynamic pressure bearing portion and a thrust dynamic pressure bearing portion for performing high speed rotation. .

In each of the above-described embodiments, the fixed central shaft portion is used as the radial fixing member, and the rotary unit rotates at high speed around its circumference through the radial dynamic pressure bearing. The present invention is similarly applied to a rotary device having a structure in which a rotary unit including a central shaft portion rotates at high speed with respect to a fixed member via a radial dynamic pressure bearing.

[0120]

The optical deflecting device and the method of manufacturing the optical deflecting device of the present invention are configured as described above, and therefore have the following effects.

(1) In the optical deflector of the present invention, the rotary polygon mirror and the flange member rotate accurately with respect to the center of rotation of the outer cylinder member, and the dynamic balance can be corrected to a minimum.
In addition, since distortion due to press fitting, shrink fitting, etc. that fastens the outer cylinder member and the flange member is not transmitted to the fixed portion of the rotary polygon mirror and the flange member, the flatness of the rotary polygon mirror, temperature change, and rotation due to high speed rotation The displacement of the polygon mirror is prevented. Further, the stress applied to the bonding portion for fixing the outer cylinder member and the flange member is reduced, the adhesive is not peeled off, the reflecting mirror surface of the rotating polygon mirror is not distorted due to the bonding, and highly accurate image exposure is achieved. . Further, the difference in thermal expansion between the fixed portions of the rotary polygon mirror and the flange member is small, and problems such as distortion of the reflecting mirror surface of the rotary polygon mirror and reduction in adhesive strength are reduced. (Claims 1 to
3) (2) By positioning and fixing the rotary polygon mirror to the outer cylinder member, the eccentricity of the rotary polygon mirror is reduced when the rotor unit is assembled, and the mutual difference in radius between the plurality of reflecting mirror surfaces of the rotary polygon mirror is reduced. Further, it is possible to reduce the eccentricity of the rotary polygon mirror after assembly. Further, the work of inserting the rotary polygon mirror into the outer cylinder member at the time of assembly becomes easy. That is, the rotating polygon mirror can be fixed to the outer cylinder member with high accuracy and eccentricity in a short working time without using a special tool or a complicated process during assembly. (Claims 4 to 6) (3) Since the distortion of the fastening between the outer cylinder member and the flange member is not transmitted to the fixed portion between the rotary polygon mirror and the flange member,
Problems such as poor flatness of the reflecting surface of the rotary polygon mirror, temperature change, positional displacement of the rotary polygon mirror due to high-speed rotation, and eccentricity of the rotary polygon mirror are solved. Further, the stress applied to the bonded portion is reduced, the adhesive is not peeled off, and the distortion of the reflecting mirror surface of the rotary polygon mirror due to the bonding does not occur, so that highly accurate image exposure is achieved. Further, the rotary polygon mirror and the first cylindrical portion of the flange member are in non-contact with each other and do not interfere with each other, so that the distortion of the rotary polygon mirror does not occur. (Claims 7 to 12) (4) The rotary polygon mirror and the flange member are bonded to each other at two bonding portions which are not parallel to each other, whereby the bonding is further strengthened and the peeling of the adhesive agent is prevented. Further, the stress applied to the adhesive portion is reduced, the adhesive agent is not peeled off, and the reflective mirror surface of the rotary polygon mirror is not distorted due to the adhesive, so that highly accurate image exposure is achieved. (Claims 13 to 17) (5) The rotary polygon mirror and the flange member are bonded at two non-parallel bonding portions, whereby the bonding is further strengthened and the peeling of the adhesive is prevented. Further, the stress applied to the bonded portion is reduced, the adhesive is not peeled off, and the distortion of the reflecting mirror surface of the rotating polygon mirror due to the bonding does not occur. Further, the rotary polygon mirror and the first cylindrical portion of the flange member are in non-contact with each other and do not interfere with each other, so that the distortion of the rotary polygon mirror does not occur. (Claims 18 to 23)

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of an image forming apparatus equipped with an automatic document feeder and an image reading device.

FIG. 2 is a sectional view showing an embodiment of an image exposure apparatus.

FIG. 3 is a perspective view of an image exposure apparatus.

FIG. 4 is a plan view of the image exposure apparatus.

5A and 5B are a plan view and a cross-sectional view showing a first embodiment of an optical deflecting device of the present invention.

FIG. 6 is an exploded cross-sectional view of a light deflector.

FIG. 7 is a sectional view showing a second embodiment of an optical deflecting device of the present invention.

FIG. 8 is a sectional view showing a third embodiment of the optical deflecting device of the invention.

FIG. 9 is a sectional view showing a fourth embodiment of an optical deflecting device of the present invention.

FIG. 10 is a sectional view showing a fifth embodiment of an optical deflecting device of the present invention.

FIG. 11 is a sectional view showing a sixth embodiment of an optical deflecting device of the invention.

FIG. 12 is a sectional view showing a seventh embodiment of an optical deflecting device of the present invention and an enlarged sectional view of an adhesive portion.

13A and 13B are a sectional view showing an eighth embodiment of an optical deflecting device of the invention and an enlarged sectional view of an adhesive portion.

FIG. 14 is a sectional view showing a ninth embodiment of an optical deflecting device of the invention and an enlarged sectional view of an adhesive portion.

FIG. 15 is a sectional view showing a tenth embodiment of an optical deflecting device of the invention and an enlarged sectional view of an adhesive portion.

16A and 16B are a sectional view showing an eleventh embodiment of an optical deflecting device of the invention and an enlarged sectional view of an adhesive portion.

FIG. 17 is a sectional view showing a twelfth embodiment of an optical deflecting device of the invention and an enlarged sectional view of an adhesive portion.

FIG. 18 is a sectional view showing a thirteenth embodiment of an optical deflecting device of the invention and an enlarged sectional view of an adhesive portion.

FIG. 19 is a cross-sectional view showing an example of a conventional optical deflector provided with a dynamic pressure bearing.

[Explanation of symbols]

3 Image exposure device 10 Stator unit 11 Support base (base member) 12 Fixed bearing member (inner cylinder member) 20 rotor unit 21 Rotary bearing member (outer cylinder member) 22 Rotating polygon mirror 23 Flange member 231 First cylindrical portion 232 Second cylindrical part 30 Optical deflector b1, c1, d1, e1 first adhesive part b2, c2, d2, e2 second adhesive part e3 Third adhesive part

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Naohiro Ohno             2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica stock             In the company (72) Inventor Hiroshi Miyakoshi             2970 Ishikawa-cho, Hachioji-shi, Tokyo Konica stock             In the company F-term (reference) 2C362 BA05 BA83 BA90                 2H045 AA07 AA14 AA15 AA24 AA62                 5C051 AA02 CA07 DB24 DB30 DC07                 5C072 AA03 HA02 HA09 HA13 XA05

Claims (23)

[Claims] 1. A rotary unit comprising a rotary polygonal mirror, a flange member for fixing the rotary polygonal mirror, a magnet for rotational driving, a rotary bearing member for rotatably supporting the rotor unit, and a fixed bearing member. In an optical deflector having a pressure bearing, a support base for supporting the fixed bearing member, and a stator unit including a rotation driving magnet coil, the flange member fixes an outer peripheral surface of the rotary bearing member. An optical deflector comprising a cylindrical portion, a second cylindrical portion holding a lower end surface of the rotary polygon mirror, and a disc portion connecting the first cylindrical portion and the second cylindrical portion. apparatus. 2. The optical deflector according to claim 1, wherein an upper end surface of the second cylindrical portion and a lower end surface of the rotary polygon mirror are bonded and fixed. 3. The optical deflector according to claim 1, wherein the flange member and the rotary polygon mirror are made of materials having the same coefficient of thermal expansion. 4. A rotor unit composed of a rotary polygonal mirror, a flange member for fixing the rotary polygonal mirror, a magnet for rotational driving, a rotary bearing member for rotatably supporting the rotor unit, and a fixed bearing member. In an optical deflector having a pressure bearing, a support base for supporting the fixed bearing member, and a stator unit including a magnet coil for rotation driving, an opening formed in the rotation center of the rotary polygon mirror, An optical deflecting device, characterized in that the rotary bearing member is fitted and positioned with an outer peripheral portion of the rotary bearing member. 5. The optical deflector according to claim 4, wherein the rotary bearing member is made of ceramic. 6. An opening formed in a rotation center portion of a rotary polygonal mirror on an outer peripheral portion of a rotary bearing member on which a fixed bearing member is fixed to a support base to form a stator unit. A method of manufacturing an optical deflecting device, characterized in that the parts are fitted and positioned to form a rotor unit, and the optical deflecting device is assembled. 7. The opening according to claim 1, wherein an opening formed in the center of rotation of the rotary polygon mirror and an outer peripheral portion of the rotary bearing member are fitted and positioned. Light deflection device. 8. The optical deflecting device according to claim 7, wherein the second cylindrical portion and the rotary polygon mirror are bonded and fixed to each other. 9. The upper end surface of the second cylindrical portion having an upper end surface protruding from the end surface of the first cylindrical portion is abutted and fixed to the lower end surface of the rotary polygon mirror. 7. The optical deflector according to 7 or 8. 10. The optical deflector according to claim 7, wherein the flange member and the rotary polygon mirror are made of materials having the same coefficient of thermal expansion. 11. The optical deflector according to claim 7, wherein the rotary bearing member is made of ceramic. 12. A fixed bearing member is fixed to a support base to form a stator unit, and a first cylindrical portion of a flange member is fixed to an outer peripheral portion of a rotary bearing member into which the fixed bearing member is fitted, the rotary bearing. An opening formed at the center of rotation of the rotary polygon mirror is fitted to the outer peripheral portion of the member for positioning, and the lower end surface of the rotary polygon mirror is held on the upper end surface of the second cylindrical portion formed on the flange member. Fixed to form the rotor unit,
A method for manufacturing a light deflecting device, comprising assembling a light deflecting device. 13. A rotor unit including a rotary polygon mirror, a flange member for fixing the rotary polygon mirror, a magnet for rotational driving, and a rotary bearing member and a fixed bearing member for rotatably supporting the rotor unit. In an optical deflector having a pressure bearing, a support base that supports the fixed bearing member, and a stator unit that includes a magnet coil for rotational driving, a surface that faces the rotary polygon mirror and the flange member is adhesively fixed. 1. Optical deflection, characterized in that one adhesive portion and a second adhesive portion connected to an end portion of the first adhesive portion and having an angle with the first adhesive portion are provided on the flange member and the rotary polygon mirror. apparatus. 14. The flange member includes a first cylindrical portion that fixes an outer peripheral surface of the rotary bearing member, a second cylindrical portion that holds a lower end surface of the rotary polygon mirror, the first cylindrical portion and the first cylindrical portion. 14. The optical deflector according to claim 13, wherein the optical deflector is formed of a disc portion that connects the two cylindrical portions. 15. A groove is provided in at least one of an outer peripheral portion and an inner peripheral portion adjacent to a bonding surface of a lower end surface of the rotary polygon mirror to an upper end surface of the flange member, and an adhesive agent can enter the groove portion. The optical deflector according to claim 13 or 14, characterized in that. 16. A groove portion is provided on a bonding surface between a lower end surface of the rotary polygon mirror and an upper end surface of the flange member, and an adhesive can be introduced into the groove portion.
The optical deflector according to item 4. 17. The optical deflector according to claim 13, wherein the flange member and the rotary polygon mirror are made of materials having the same coefficient of thermal expansion. 18. An opening formed in the center of rotation of the rotary polygon mirror and an outer peripheral portion of the rotary bearing member are fitted and positioned.
The optical deflector according to item 4. 19. A groove portion is provided in at least one of an outer peripheral portion and an inner peripheral portion adjacent to a bonding surface of a lower end surface of the rotary polygon mirror to an upper end surface of the flange member, and an adhesive agent can enter the groove portion. The optical deflector according to claim 18, wherein: 20. The light according to claim 18, wherein a groove portion is provided on a bonding surface of the lower end surface of the rotary polygon mirror with the upper end surface of the flange member, and the adhesive agent can enter the groove portion. Deflection device. 21. An upper right end surface of the second cylindrical portion having an upper end surface protruding from an end surface of the first cylindrical portion is abutted and fixed to a lower end surface of the rotary polygon mirror. Item 21. The optical deflector according to any one of items 18 to 20. 22. The optical deflector according to claim 18, wherein the flange member and the rotary polygon mirror are made of materials having the same coefficient of thermal expansion. 23. A fixed bearing member is fixed to a support base to form a stator unit, and a first cylindrical portion of a flange member is fixed to an outer peripheral portion of a rotary bearing member into which the fixed bearing member is fitted. An opening formed in the center of rotation of the rotary polygon mirror is fitted to the outer peripheral portion of the member for positioning, and the lower end surface of the rotary polygon mirror and the upper end surface of the second cylindrical portion of the flange member are bonded together. The rotary polygon mirror is adhesively fixed to the flange member by the first adhesive portion to be fixed and the second adhesive portion having an angle with the adhesive surface connected to the end portion of the first adhesive portion, and the second cylindrical portion of the second cylindrical portion is fixed. A method for manufacturing an optical deflecting device, characterized in that a lower end face of the rotary polygon mirror is held and fixed to an upper end face to form a rotor unit, and an optical deflecting device is assembled.