JPH0545571A - Mirror holding device for image forming device - Google Patents

Abstract

PURPOSE:To stably hold a flat mirror which is installed in an image forming device. CONSTITUTION:The 2nd and 3rd mirrors 2c formed in a V-shape and installed in a scanning optical system for the image forming device are mounted on respective sheet members 20 and 20' installed opposite to each other with reference to a holding plate 30. 2nd and 3rd mirrors mount parts 20a, 20b, 20a' and 20b' for receiving the 2nd and 3rd mirrors are installed so as to be formed in the V shape on the sheet members 20 and 20', and both end sides are received by a linearly cut surface formed on the mount parts 20a and 20b and a projecting part 20f formed on the other mount parts 20a' and 20b' of the sheet member 20'. And the 2nd and 3rd mirrors 2c mounted on respective sheet members 20 and 20' are pressed so as to be held by an elastic member 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holding device for a plane mirror provided in a scanning optical system of an image forming apparatus such as a copying machine, an image reader, a scanner, a reader printer, etc., and more particularly to a mirror holding apparatus for an electrophotographic image forming apparatus. ..

[0002]

2. Description of the Related Art Generally, in an electrophotographic image forming apparatus such as a copying machine or an image scanner, a platen on which a document is placed, a document irradiation lamp reciprocating below the platen, a reflection mirror, a fixed projection lens and a reflection mirror. And a photosensitive drum which is endlessly rotated by a scanning electrode and a predetermined potential charged by a band electrode, and toner is applied to the electrostatic latent image formed on the surface of the photosensitive drum by the scanning optical system. Developing device, a transfer pole for transferring the toner image onto the surface of the recording paper conveyed downward to the surface of the photosensitive drum, a separating electrode and a removing electrode, and a transfer electrode for transferring onto the recording paper surface. And a cleaning device for removing the toner and paper dust remaining on the surface of the photoconductor after transfer.

Then, desired toner images are successively recorded on the surface of the recording paper which is intermittently conveyed along a predetermined conveying path. Conventionally, a plurality of plane mirrors provided in the scanning optical system are mounted on a predetermined mounting portion of, for example, a holder that is cast or a plate member that is pressed, and the mirror surfaces are pressed by an elastic member to press each other. It is installed with the position and angle adjusted.

[0004]

The plane mirror provided in the scanning optical system of the image forming apparatus has, for example, a length capable of projecting a document image in the B4 plate width direction and a width corresponding to a predetermined scanning slit. Therefore, its area is large and therefore its weight is also heavy. Conventionally, the holding member of the above-mentioned flat mirror uses a holder made by casting so as to maintain its flatness and sufficiently bear the weight, but it takes a lot of processing man-hours and sufficient accuracy cannot be maintained due to a draft or the like. However, there is a problem in reducing the weight and size of the image forming apparatus. In recent years, in order to avoid such problems, downsizing and weight reduction of mirrors and press working of members for holding the mirrors have been further advanced, and further, as disclosed in Japanese Utility Model Publication No. Sho 55-91545, plate members made by press working have been used. A mirror surface is provided without adjustment by so-called three-point support, which is provided with mounting portions for receiving both ends of the flat mirror, for example, one mounting portion is provided with one projection portion and the other mounting portion is provided with two projection portions. It is disclosed that it is intended to receive. However, the projection of the chevron-shaped cut surface of the cut surface changes in the apex position of the projection due to the wear of the press die itself depending on the production amount. The angle accuracy of the system with respect to the set optical axis is not maintained and changes occur, so a slight adjustment is required, and particularly in the V-mirror optical system in which the two mirrors are held at 90 degrees, This causes a change in the maintenance of the squareness, which causes distortion in the projected image and the read image, which causes deterioration in image quality. Also, since the cut surfaces of the projections are not always smooth and all are received by point contact, the mounting position and angle of the mirrors that are bent at a certain angle may be affected by vibration, shock, etc. especially in the optical system in which the mirror holding member moves. However, there is a problem that the image quality changes during writing and reading.

The present invention solves the above problems and does not impair the flatness of the mirror attached to the plate-like member (for holding the mirror) and particularly the maintenance of the accuracy of the attachment angle such as the squareness of the V-mirror and the like. An object of the present invention is to provide a mirror holding device for an image forming apparatus, which can maintain a constant mounting accuracy even when the holding member is moved or is subjected to vibration or shock during movement.

[0006]

[Means for Solving the Problems]
It is achieved by any one of b, c, d and e.

(A) A mirror holding device for receiving one end of each of the flat mirrors on a press cutting surface formed on a plurality of plate-like members which are arranged at intervals and are opposed to each other, and the end of the flat mirrors. The surface on the side is received by a linear cutting surface formed by pressing on the plate-shaped member, the surface on the other end side is received by a pressing surface having at least one protrusion, and the flat mirror surface is pressed by an elastic member. A mirror holding device for an image forming apparatus, wherein the mirror holding device is configured to hold the same.

(B) In (a), a cushioning member is interposed on the straight line of the straight cut surface formed on one of the plate-like members, and the cushioning member is formed on the other plate member.
A mirror holding device for an image forming apparatus, characterized in that the flat mirror is held by two projections.

(C) In (a), a supporting member having two supporting portions is interposed on a straight cut surface formed on one of the plate members, and the supporting member and one protrusion of the other plate member. According to another aspect of the present invention, there is provided a mirror holding device for an image forming apparatus, characterized in that the flat mirror is held by the above.

(D) A mirror holding device for receiving both ends of a flat mirror on press cut surfaces formed on a plurality of plate-like members which are spaced apart and opposed to each other, and which is formed on one plate-like member. An image characterized in that a supporting member having at least one supporting portion is interposed on the linear cut surface and the flat mirror is held by the supporting member and the linear cut surface of the other plate member. Mirror holding device of forming device.

(E) Mirror holding device for receiving both end sides of a plane mirror with a supporting member interposed on a straight cutting surface formed by pressing, which is formed on a plurality of plate-like members arranged at intervals and facing each other. And 1 on one straight cut surface
The support portion having one support member is provided, and the support member having two support portions is provided on the other straight cut surface to receive the plane mirror on each support portion and the plane mirror surface by the elastic member. A mirror holding device for an image forming apparatus, wherein the mirror holding device is configured to be pressed and held.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is a perspective view showing the structure of the mirror holding device of FIG. 1, a view showing the holding state of the mirror of FIG. 2, and a side view showing the holding state of the mirror by a buffer member of FIG. 8A and 8B, an explanatory view showing a holding state of the mirror by the supporting member shown in FIGS. 4 and 5, a side sectional view showing a mounting state of the supporting member shown in FIGS. 6 and 7, and a configuration of the image forming apparatus shown in FIG. A side sectional view will be described.

However, the present invention is not limited to this embodiment.

As shown in FIG. 8, an electrophotographic image forming apparatus
Reference numeral 18 denotes a platen glass P for placing the original M on the upper surface of the main body 1.
The scanning optical system 2 is provided below the platen glass P in the main body 1. The scanning optical system 2 includes a reciprocating document irradiation lamp 2a, a first mirror 2b, second and third mirrors 2c forming a V shape, a fixed lens 2d and a fourth mirror 2e. A photosensitive drum 3 is rotatably provided in the direction of the arrow at the center of the inside of the main body 1, and a belt electrode 4 for uniformly charging the photosensitive body 3a along the rotation direction is provided around the photosensitive drum 3, and a toner replenishing device. Developing device 6 that is replenished with toner by 5 and has a developing sleeve 6a built-in;
A transfer electrode 7, a separation electrode 8, a charge eliminating electrode 9, and a cleaning device 10 are sequentially arranged. Supply cassette 11,
Two types of recording papers of different sizes are housed in 11 'and set in the main body 1. 12 is a paper cassette 11
Is a first paper feed roller that feeds the recording paper stored in to a standby position before the second supply roller 13, and is a roller 12a that is rotated via a belt to prevent double feeding of the recording paper.
12a and a stop roller (also referred to as a separating roller) 12b. Reference numeral 13 is an appropriate timing so that the recording paper fed by the first paper feed roller 12 is temporarily stopped at the standby position, and then the front end of the visible image on the photoconductor 3a and the front end of the recording paper are aligned at the transfer position. The second paper feed roller 14 that feeds paper again toward the transfer position at 14 is a guide plate for guiding the recording paper fed by the first paper feed roller 12 to the position of the second paper feed roller 13, It is opened and closed by operating a lever (not shown) so that the jammed paper can be taken out by inserting a hand. Reference numeral 15 is a conveying device that conveys the recording paper after transfer to a fixing position, and the fixing device 16 is a heating roller.
16a and pressure roller 16b. Reference numeral 17 denotes a paper discharge roller that discharges the recording paper after fixing to the outside of the main body.

When the copy button is operated in the above apparatus, the original M on the platen glass P is exposed and scanned by the scanning optical system 2, and an electrostatic latent image of the original M is formed on the photoconductor 3a of the photoconductor drum 3. It This electrostatic latent image is developed by the developing device 6.
To form a visible image, and this visible image is transferred by the transfer electrode 7 to the recording paper fed from one of the paper feed cassettes 11 and 11 'of the main body 1. After the transfer, the recording paper is separated from the photoconductor 3a by the separation electrode 8 and is fixed by the conveying device 15
The sheet is conveyed to 16, fixed there, and ejected by the ejection roller 17.

In this way, the required toner images are successively recorded on the recording paper surface.

In the present invention, the above-mentioned problems are eliminated, and a holding device for a flat mirror is constructed as follows.

It should be noted that the present invention is exemplified by a holding device for the second and third mirrors 2c which is mounted by forming a V-shape provided on the frame (not shown) of the scanning optical system 2 of FIG. Although described, the present invention is not limited to this, and it goes without saying that the present invention can also be applied to holding a plane mirror composed of one sheet such as the first mirror 2b and the fourth mirror 2e.

The first embodiment is a holding plate attached to the frame (not shown) of the scanning optical system 2 as shown in FIG.
Plate members (mirror holding members) 20, 20 'are attached to face each other at a predetermined interval on both sides of 30. As shown in FIG. 1, the plate members 20 and 20 'on the right and left are formed symmetrically except for the holes of the second and third mirror mounting portions 20a, 20a', 20b and 20b '. Mounting surface on 30 20
d and a side plate 20c for mounting the second and third mirrors 2c, which is a plate-shaped press member bent at a right angle to the holding plate 30 by two pins 22 implanted in the mounting surface 20d. They are positioned and mounted, and are each integrally joined at the length 31.

Then, as shown in FIG. 2, the mounting surface 20d
The side plate 20c which is raised at a right angle is provided with second and third mirror mounting portions (mirror holding portions) 20a and 20b formed in the shape of oblong holes for receiving both end sides of the respective second and third mirrors 2c. The lower surface of the second mirror mounting portion 20a facing each other and the third mirror
The press cut surface with the upper surface of the mirror mounting portion 20b is a receiving surface on the reflecting surface side of each of the second and third mirrors 2c.
The angle formed by each of the receiving surfaces is a right angle and formed in a V shape.

As shown in FIG. 2, each of the mirror receiving surfaces of the mounting portions 20a and 20b of the second and third mirrors of the plate member 20 on the right side is formed with a smooth linear cutting surface 20e. Appropriate reliefs 20i are provided at corners at both ends of the surface 20e, and projections 20j are provided on the left side surface of the second mirror mounting portion 20a and the right side surface of the third mirror mounting portion 20b. One end face side of each of the second and third mirrors 2c is positioned and attached by the portion 20j and the straight cut surface 20e. The left plate member 20 'is provided with one protrusion 20j substantially at the center of the receiving surface of each of the second and third mirrors 2c, and the size of the protrusion 20j may be set appropriately. Height around 2 mm (1.5 to 2 times or more of the thickness of the plate member) The protrusion width is set to 3 to 4 mm, the upper surface of the protrusion 20j is provided with a smooth flat portion, and both ends are chamfered in an R shape. The press die that is applied to process the mirror receiving surface is not easily worn or damaged.

The linear cut surfaces 20e of the second and third mirror mounting portions 20a and 20b of the plate members 20 on the right side thus formed and the second and third plate members 20 'on the left side, respectively. The protrusions provided on the third mirror mounting portions 20a ', 20b'
The second and third mirrors 2c bridged with 20j are opposite to the reflection surface of each mirror 2c by an elastic member 21 inserted into the long holes of the mounting portions 20a, 20b (20a ', 20b'). It is attached by pressing against the surface. In this way, each of the second and third mirrors 2c is received by the smooth linear cut surface 20e and the flat portion of the protrusion 20j, so that it can be mounted very stably without impairing the flatness. It is retained to withstand specified vibrations and shocks. As a matter of course, the left and right plate members 20, 20 'may be reversed right and left by exchanging the straight cut surface 20e and the projection 20j.

Next, a second embodiment for holding the second and third mirrors 2c will be described below.

As shown in FIG. 3, a hard rubber formed in a flat plate shape on the linear cut surface 20e formed on the second and third mirror mounting portions 20a, 20b of the plate member 20, or a synthetic rubber. A cushioning member (elastic mirror support member) 23 such as a resin material or a metal material formed to have elasticity is attached. The thickness of the cushioning member 23 may be set appropriately, but the second, third
It has an elastic buffering force sufficient to absorb the unevenness of the press fracture surface of the straight cut surface 20e of the mirror mounting portions 20a and 20b, and one projection of the projection 20j is more stable than the other in comparison with the above embodiment. It is constructed so that it can be received flatly, and if anything, it is preferably used for receiving a single mirror (for example, a mounting plate of the first mirror 2b) rather than the V mirror type. Then, similarly to the first embodiment described above, each of the second and second members pressed and held by the elastic member 21.
The third mirror 2c includes the linear cutting surface 20e and the buffer member 23.
It is mounted so that it can be stably held by the smooth surface with respect to the surface without impairing the flatness, and can sufficiently withstand the vibration and the cushion as described above.

Next, a third embodiment will be described. As described in the first embodiment, the support member 24 having two support portions is attached on the straight cut surface 20e of the second mirror attachment portion 20a of the plate member 20. As shown in FIG. 4, the support member
Reference numeral 24 is a plate-shaped member that is pressed by a metal material, for example, and two supporting portions 24a that are bent at right angles or in a U-shape are formed at the upper ends of the supporting member 24 in the width direction. It is provided. And, for example, a support part bent in a U shape
24a is fitted on the straight cut surface and the plate member 20
The support member 24 attached to the above is integrally joined by adhesion or a non-locking member. The upper surface of the supporting portion 24a of the supporting member 24 serves as a receiving surface for the second and third mirrors 2c. Therefore, the upper surface of the support portion 24a is bent so that the sagging surface at the time of press cutting becomes the upper surface to form a smooth mirror receiving surface without edges. Although not shown, a linear member supports the member.
A support member having the same function as 24 may be formed. It should be noted that, if necessary, a mounting portion may be provided so that the height of the mirror position by the support member 24 of the linear cut surface 20e of the one plate member 20 matches the height of one protrusion 20j of the other mirror receiver. The slot size of 20a is set. The smooth surface of the support portion 24a of the support member 24 mounted on the one straight cut surface 20e thus formed and the projection 20j at the other point
Therefore, as in the first and second embodiments described above, the mirror can be stably held without impairing the flatness of the mirror. The support member 24 is not limited to a metal material and may be a molded member made of a synthetic resin material. In the above-described embodiment, an example is described in which one is a one-point projection by press cutting and the other is formed by a supporting member having supporting portions at both ends, but one is a straight cutting surface and the other is one in the center described later. The support member 25 having the support portion 25a may be configured to receive the plane mirror.

Next, a fourth embodiment will be described. As shown in FIG. 5, the first and second plate members 20, 20 'are respectively
The third mirror mounting portions 20a, 20b, 20a ', 20b' are respectively provided with straight cutting surfaces 20e cut at the same height, and the second and third mirror mounting portions of one plate member 20 'are mounted. A support member 25 having one support portion 25a is mounted on a straight cut surface 20e formed on the portions 20a 'and 20b' (the side 20b 'is not shown), and the second member of the other plate member 20 is attached. ，
A supporting member 24 having the supporting portion 24a is mounted on each of the straight cut surfaces of the third mirror mounting portions 20a and 20b (20b is not shown).

The support member 25 is formed of a plate-like member using a metal material or a synthetic resin material having the same thickness as the support member 24, or a linear member, and the left and right plate-like members 20, 2 are formed.
0'each of the second and third mirror mounting portions 20a, 2
Each of the support members 2 attached to 0b, 20a ', 20b'
The upper surfaces formed by the three points of the respective support portions 24a, 25a of 4, 25 have the same height. The support member 25 is processed under the same conditions as the support member 24 described above. The supporting members 24 and 25 are placed by being sandwiched on the straight cut surface 20e of the plate member 20, and the flat mirror is supported by three points of the supporting portions 24a and 25a. The member 21 is pressed and attached by the member 21 and then integrally joined by adhesion or glue fixing.

As shown in FIG. 6, the supporting member 24 is attached by providing a protruding portion 20h which is cut and bent on the side plate 20c of the plate member 20 and between the surface of the protruding portion 20h and the surface of the plate member 20. After the lower end of the support member 24 is held, the support portion 24a having, for example, a U-shape is fitted to the second and third mirror mounting portions 20a and 20b and placed on the straight cut surface 20e. Similarly to the above, it is attached to the surface of the side plate 20c by adhesion (shown in the figure) or by fixing with a screw. Further, FIG. 7 shows, for example, the support portion 24a bent at a right angle to the mirror mounting portion.
It shows a state in which after being placed on the straight cut surface 20e of 20a and 20b, it is attached by the same type of fixing (illustration) or adhesion as described above. The shape of the support portion 24a of the support member 24 shown in FIGS. 6 and 7 may be either a right angle shown by a chain line or a U-shape.

The support member 25 is also attached to the plate member 20 'by the same method as described above. The respective second and third mirrors 2c thus mounted are stably mounted without impairing the flatness and sufficiently withstanding vibration and impact. Further, it is possible to obtain a mirror holding device which does not cause an error in dimensional accuracy due to a change in processing, abrasion, etc. as in the conventional case.

In the above-mentioned mirror holding device, the holding means of the second and third mirrors 2c forming the V-shape of the scanning optical system 2 which should always maintain the perpendicularity has been described. As a matter of course, the above-described embodiments are applied to the means.

[0031]

With the flat mirror holding device according to the present invention, the image forming apparatus can be miniaturized and lightened, and the flat mirror can be held without impairing the flatness of the flat mirror and with no problem in the prescribed vibration and shock. It became so. Further, the press die for processing the mirror support member or the plate member is not easily worn or damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing the configuration of a mirror holding device according to an embodiment of the present invention.

FIG. 2 is a side view showing a holding state of a mirror according to an embodiment of the present invention.

FIG. 3 is a side view showing a holding state of a mirror by a cushioning member according to an embodiment of the present invention.

FIG. 4 is a perspective view showing a holding state of a mirror using a supporting member according to an embodiment of the present invention.

FIG. 5 is a perspective view showing a holding state of a mirror using another supporting member according to an embodiment of the present invention.

FIG. 6 is a side sectional view showing a mounting state of a support member according to an embodiment of the present invention.

FIG. 7 is a side sectional view showing another mounting state of the support member according to the embodiment of the present invention.

FIG. 8 is a side sectional view showing the configuration of the image forming apparatus.

[Explanation of symbols]

 2 Scanning optical system 2c Second and third mirrors 3 Photoreceptor drum 18 Image forming device 20 Plate member 20a Second mirror mounting portion 20b Third mirror mounting portion 20c Side plate 20d Mounting surface 20e Straight cut surface 20j Projection 21 Elastic member 23 buffer member 24 support member 24a support portion 25 support member 25a support portion

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[Procedure amendment]

[Submission date] August 30, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

As shown in FIG. 2, each of the mirror receiving surfaces of the mounting portions 20a and 20b of the second and third mirrors of the plate member 20 on the right side is formed with a smooth linear cutting surface 20e. Appropriate reliefs 20i are provided at corners at both ends of the surface 20e, and projections 20j are provided on the left side surface of the second mirror mounting portion 20a and the right side surface of the third mirror mounting portion 20b. One end face side of each of the second and third mirrors 2c is positioned and attached by the portion 20j and the straight cut surface 20e. And as shown in FIG.
The plate member 20 ' on the left side of each of the second and third mirrors 2c
Substantially central portion one protrusion 20 f is provided protrusion portion 20 f of the dimensions may but for example 2mm height before and after being appropriately set (as the thickness of the Itabutsu member 1.5 to 2 times more than the receiving surface of the ) the upper surface of the projection width is set to 3~4mm protrusion portion 20 f may each side with a smooth flat portion is provided by press die easily worn for processing the mirror receiving surface chamfered in R shape It will not be damaged or damaged.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

The linear cut surfaces 20e of the second and third mirror mounting portions 20a and 20b of the plate members 20 on the right side thus formed and the second and third plate members 20 'on the left side, respectively. The protrusions provided on the third mirror mounting portions 20a ', 20b'
20 f and the second passed sieved, third mirror 2c is the respective mounting portions 20a, 20b (20a ', 20b ') by an elastic member 21 which is inserted into the long hole portion of the reflecting surface of each of the mirror 2c It is attached by pressing against the opposite surface. In this way, the respective second, third mirror 2c is just be being mounted extremely stably without deteriorating the flatness. Therefore be received by the flat portion of the protrusion 20 f a smooth linear cutting surface 20e Instead, it is held to withstand specified vibrations and shocks. The right and left of the plate material member 20, 20 'that the straight cutting surface 20e may be horizontally reversed interchanging the protrusion 20 f is a matter of course.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0024

[Correction method] Change

[Correction content]

As shown in FIG. 3, a hard rubber formed in a flat plate shape on the linear cut surface 20e formed on the second and third mirror mounting portions 20a, 20b of the plate member 20, or a synthetic rubber. A cushioning member (elastic mirror support member) 23 such as a resin material or a metal material formed to have elasticity is attached. The thickness of the cushioning member 23 may be set appropriately, but the second, third
Mirror mounting portion 20a, more stable than the Example and the other with respect to the projection of a point of the protrusion 20 f has an elastic damping force sufficient to absorb the unevenness of the press fracture surface of straight cut surface 20e of 20b It is constructed so that it can be received with the above-mentioned planarity, and if anything, it is preferably used for receiving one mirror (for example, a mounting plate of the first mirror 2b) rather than the V mirror type. Then, similarly to the first embodiment described above, each of the second and second members pressed and held by the elastic member 21.
The third mirror 2c includes the linear cutting surface 20e and the buffer member 23.
Smooth surface by being stably held without impairing the flatness in the same manner as described above vibrations of the surface, it is attached to the power sale by withstand sufficiently <br/> in buffer.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

Next, a third embodiment will be described. As described in the first embodiment, the support member 24 having two support portions is attached on the straight cut surface 20e of the second mirror attachment portion 20a of the plate member 20. As shown in FIG. 4, the support member
Reference numeral 24 is a plate-shaped member that is pressed by a metal material, for example, and two supporting portions 24a that are bent at right angles or in a U-shape are formed at the upper ends of the supporting member 24 in the width direction. It is provided. And, for example, a support part bent in a U shape
24a is fitted on the straight cut surface and the plate member 20
The support member 24 attached to the above is integrally joined by adhesion or a non-locking member. The upper surface of the supporting portion 24a of the supporting member 24 serves as a receiving surface for the second and third mirrors 2c. Therefore, the upper surface of the support portion 24a is bent so that the sagging surface at the time of press cutting becomes the upper surface to form a smooth mirror receiving surface without edges. Although not shown, a linear member supports the member.
A support member having the same function as 24 may be formed. Incidentally, one of the plate material member 20 the straight cutting surface 20e 1 one protrusion 20 f height and attached as needed to match the height of the mirror position by the support member 24 receives the other of the mirrors of the The long hole dimension of the portion 20a is set. Thus the smooth surface and the other one point of the support portion 24a of the support member 24 mounted on one of the straight cutting surfaces 20e formed protrusion 20 f
Therefore, as in the first and second embodiments described above, the mirror is held stably without impairing the flatness of the mirror. The support member 24 is not limited to a metal material and may be a molded member made of a synthetic resin material. In the above-described embodiment, an example is described in which one is a one-point projection by press cutting and the other is formed by a supporting member having supporting portions at both ends, but one is a straight cutting surface and the other is one in the center described later. The support member 25 having the support portion 25a may be configured to receive the plane mirror.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] Explanation of code

[Correction method] Change

[Correction content]

[Explanation of reference numerals] 2 Scanning optical system 2c Second and third mirrors 3 Photoreceptor drum 18 Image forming device 20 Plate member 20a Second mirror mounting portion 20b Third mirror mounting portion 20c Side plate 20d Mounting surface 20e Straight cutting surface 20 f Projection 21 Elastic member 23 Cushioning member 24 Supporting member 24a Supporting part 25 Supporting member 25a Supporting part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Fumio Hanbara 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Tadashi Izawa 2970 Ishikawa-cho, Hachioji, Tokyo Konica stock company (72) Inventor Kazutoshi Tozawa Katsutoshi Tozawa 2970 Ishikawacho, Hachioji, Tokyo Konica Co., Ltd. In the company

Claims (5)

[Claims] 1. A mirror holding device for receiving both end sides of a flat mirror on a press cutting surface formed on a plurality of plate-like members which are arranged at intervals and are opposed to each other, wherein one end side of the flat mirror is provided. The surface is received by a linear cutting surface formed by pressing on the plate-shaped member, the surface on the other end side is received by a pressing cutting surface having at least one protrusion, and the flat mirror surface is pressed by an elastic member. A mirror holding device for an image forming apparatus, characterized in that it is held. 2. The projection part formed on the cushioning member and the other plate member with a cushioning member interposed on the straight surface of the straight cut surface formed on the one plate member in claim 1. A mirror holding device for an image forming apparatus, characterized in that the flat mirror is held by the following. 3. A support member having two support portions on a straight cut surface formed in one plate member according to claim 1, and said support member and one protrusion of the other plate member. A mirror holding device of an image forming apparatus, wherein the flat mirror is held. 4. A mirror holding device for receiving both end sides of a flat mirror on press cut surfaces formed on a plurality of plate-like members arranged at intervals and facing each other, and formed on one plate-like member. An image forming method characterized in that a supporting member having at least one supporting portion is interposed on the linear cutting surface, and the flat mirror is held by the supporting member and the linear cutting surface of the other plate member. Device mirror holding device. 5. A mirror holding device for receiving both end sides of a flat mirror with a supporting member interposed on a straight cutting surface formed by pressing formed on a plurality of plate-like members arranged at intervals and facing each other. Then, the supporting member having one supporting portion is provided on one straight cutting surface, and the supporting member having two supporting portions is provided on the other straight cutting surface, and the flat surface is provided on each supporting portion. A mirror holding device of an image forming apparatus, wherein a mirror is received and an elastic member presses and holds the plane mirror surface.