JP5046846B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus including an optical device housing that houses optical devices such as a polygon mirror that scans while reflecting a plurality of light beams for writing an electrostatic latent image in different directions. .

A so-called tandem-type image forming apparatus includes a plurality of photosensitive drums (image carriers) that carry toner images of different colors (generally, four colors of black, magenta, cyan, and yellow). An image forming unit is configured. Each of the plurality of image forming units forms a color toner image on the surface of the intermediate transfer belt by transferring each color toner image on the moving intermediate transfer belt (intermediate transfer member) in an overlapping manner. By transferring the color toner image from the intermediate transfer belt to the recording paper, a color image is formed on the recording paper.
In the tandem image forming apparatus, the laser beam light for writing the electrostatic latent image generated for each toner color is transmitted in a predetermined direction (main scanning direction) by an optical scanner including a polygon mirror and its driving motor. The electrostatic latent image is written on the surface of the photosensitive drum by the scanned laser beam.

Also, some tandem image forming apparatuses use a single optical scanner to emit multiple laser beams to reduce the size of the apparatus, save power, and reduce the number of parts (reducing assembly man-hours and costs). Some include an optical scanning optical system (hereinafter referred to as a dual optical scanning optical system) that scans while reflecting in different directions.
For example, Patent Document 1 and Patent Document 2 show an image forming apparatus including the duplex optical scanning optical system that scans two laser beam lights in different directions by one optical scanner. Usually, an image forming apparatus provided with the above-described dual optical scanning optical system is provided for each optical scanner that scans each of a plurality of laser beam lights. ) Is housed (hereinafter referred to as an optical device housing case), and the optical device housing case and the devices incorporated therein are unitized. Generally, the optical device housing is made of resin, and one optical scanner and a plurality of scanning lens systems (such as an fθ lens) are housed in one optical device housing.

By the way, in the compound optical scanning optical system, as shown in Patent Document 1, a part of laser beam light that reaches a lens such as an fθ lens (for example, the total light amount) in one optical device housing case. 2 to 3%) may be reflected, and the reflected light may be mixed with another laser beam light scanning lens system to become flare light. On the other hand, Patent Document 1 discloses providing a light shielding member for preventing the mixing of flare light.
In addition, a temperature distribution is likely to occur in the optical device housing due to heat generated by the drive motor of the polygon motor or the drive circuit of the drive motor serving as a heat source and the air flow generated by the rotation of the polygon mirror. In the compound optical scanning optical system, if a temperature distribution occurs in the optical device housing, the characteristics of each of the plurality of scanning lens systems vary, and as a result, so-called color shift (the position of the toner image for each color). Deviation) may occur. On the other hand, Patent Document 1 discloses that the temperature distribution in the optical device housing case is suppressed by providing a rib for airflow control in the optical device housing case.
JP 2003-202512 A JP 2003-322818 A

However, if there is a variation in the internal shape of the optical device housing case (the shape of a pedestal on which the optical device is mounted, a rectifying rib, etc.), there is also a variation in the optical path and airflow of flare light in the optical device housing case. There was a problem that it occurred and caused the deterioration of image quality.
For example, if the flare light path deviates from the light shielding part (flare light shading leakage) due to variations in the optical path of the flare light in the optical equipment housing, the flare light is mixed into the laser beam scanning optical system. A noise image is generated in the image.
In addition, when a temperature difference occurs in a plurality of scanning lens systems due to variations in airflow in the optical device housing, so-called color misregistration occurs.
In particular, since the optical path of flare light, which is reflected light from the lens, can be changed greatly only by slightly changing the position and orientation of the lens, the influence of variations in the shape of the optical device housing is great.
The optical equipment housings, which are often manufactured by resin molding, are usually less susceptible to individual differences between products, but there are variations in the shape of each lot, such as when the mold is updated or when manufacturing lots are switched. In such a case, there are variations in the optical path and airflow of the flare light, which may cause deterioration in image quality.
Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide an optical apparatus in an image forming apparatus of a type in which a plurality of laser beam beams are scanned in different directions by a single optical scanner. In response to variations in flare light and airflow (for example, variations in manufacturing lots) within the housing that accommodates the air, the mounting position of the flare light shielding part and airflow rectifying part can be flexibly adjusted. As a result, an object of the present invention is to provide an image forming apparatus that can prevent deterioration in image quality due to variations in the optical path of flare light and airflow.

In order to achieve the above object, an image forming apparatus according to the present invention comprises the components shown in the following (1) to (4).
(1) Optical scanning means for scanning a plurality of light beams for writing an electrostatic latent image incident from different directions while reflecting the light beams in different directions.
(2) An optical device housing case in which an optical device including the optical scanning unit is housed.
(3) A mounting seat formed in a band shape in the optical equipment housing.
(4) An attachment member formed with an action portion for blocking an optical path of flare light caused by the beam light or rectifying an air flow in the optical device housing and an engagement portion engaged with the attachment seat. .
The mounting member is held in the optical device housing case by engagement of the engaging portion with the mounting seat at an arbitrary position in a predetermined range along the mounting seat.
In addition, it is preferable that the image forming apparatus according to the present invention further includes the configurations shown in the following (5) to (7).
(5) The mounting seat is a member formed with a slit portion which is a band-shaped opening.
(6) The engaging portion of the attachment member includes a shaft portion inserted through the slit portion and two flange portions held by the shaft portion.
(7) The two hooks sandwich the portions on both sides of the slit part from the front and back both sides at an arbitrary position of the slit part, so that the engaging part is engaged with the mounting seat.

In the image forming apparatus according to the present invention, the engaging portion of the mounting member can be engaged at an arbitrary position in the longitudinal direction of the mounting seat. Therefore, according to the present invention, flare light or air flow variation (for example, variation in manufacturing lot units) in the optical device housing is provided for the action unit functioning as a flare light shielding unit or an air flow rectifying unit. Corresponding to the above, it is possible to flexibly position (adjust) an arbitrary position within a predetermined range along the mounting seat formed in a belt shape. As a result, it is possible to prevent deterioration in image quality due to variations in the optical path of flare light and airflow.
Further, by providing the configuration shown in the above (5) to (7), the engaging portion of the mounting member can be engaged at an arbitrary position in the range where the slit portion is formed, It is possible to realize an engagement mechanism (attachment mechanism) having high positioning flexibility of the action part. Further, since the mounting member is supported by the mounting seat on both sides of the slit portion (both supported) (held by the two flange portions), the mounting member is stably held. . Moreover, it can be realized by a very simple structure of the slit portion and the two flange portions.
The mounting position of the mounting member (the position at which the engaging portion is engaged) for avoiding the occurrence of light leakage and temperature distribution is, for example, when the mold of the optical device housing is updated or manufactured. What is necessary is just to confirm by actual measurement, simulation, etc. at the time of lot change.

As a specific example of the image forming apparatus having the configuration shown in the above (5) to (7), one having the configuration shown in the following (1-1) can be considered.
(1-1) The two flange portions fixed to the shaft portion do not sandwich the portions on both sides of the slit portion according to the rotation of the engaging member of the mounting member about the shaft portion. The structure which transfers to the state (engaged state) which clamps the part of the both sides of the said slit part from a state (non-engaged state).
Thereby, the attachment member can be attached to the attachment seat by a simple operation of rotating the attachment member in a state where the shaft portion is inserted into the slit portion.
It is further preferable that the image forming apparatus having the configuration shown in (1-1) further includes the configurations shown in the following (1-2) and (1-3).
(1-2) One or both of the two flanges are formed with protrusions that contact the surfaces of both sides of the slit portion in the engaged state.
(1-3) When the engaging portion of the mounting member is rotated around the shaft portion, the protruding portion is moved from the non-engaged state where the protruding portion is positioned at the slit portion. The structure which transfers to the said engagement state contact | abutted on the surface of the part of both sides of this.
Accordingly, when the attachment member is rotated in a state where the shaft portion is inserted into the slit portion, the protrusion portion rides on the surfaces on both sides of the slit portion from the position of the slit portion and slides on the engagement member. Transitions to a combined state. For this reason, compared with the case where the two flanges slide while making surface contact with the surfaces of both sides of the slit portion, the sliding frictional resistance is reduced, and the rotation operation (mounting of the mounting member) Operation).
In addition, it is more preferable that a plurality of depressions into which the protrusions are inserted in the engaged state are formed side by side along the slits on the surfaces of both sides of the slits in the mounting seat.
As a result, the operator rotates the mounting member in a state where the shaft portion is inserted through the slit portion, so that the projection portion slides on both sides of the slit portion and fits into the recess portion. When this happens, the operator feels a click feeling, and the click feeling can confirm that the engaged state has been reached, thereby improving workability.

As other specific examples of the image forming apparatus having the configurations shown in the above (5) to (7), those having the configurations shown in the following (2-1) and (2-2) are conceivable. .
(2-1) In the attachment member, the two flange parts are constituted by a fixed flange part fixed to the shaft part and an independent attachment flange member in which an insertion hole of the shaft part is formed.
(2-2) The shaft portion is inserted into the slit portion and the insertion hole of the mounting rod member, and an edge portion of the insertion hole of the mounting rod member is engaged with a retaining portion provided in the shaft portion. Thus, the fixing hook part and the attachment hook member are configured to be in an engaged state in which the portions on both sides of the slit part are sandwiched.
Such a configuration is also an example of the engagement mechanism in the present invention.
Further, it is preferable that a scale for identifying the engagement position of the engagement portion in the attachment member is written on the attachment seat.
As a result, when it is necessary to change the mounting position of the mounting member due to variations in the dimensions of the optical device housing, the mounting position can be easily confirmed and workability can be improved.
Further, it is conceivable that the mounting seat is formed across the inside of the optical equipment housing.
This increases the degree of freedom (mountable range) of the mounting position of the mounting member, and allows the mounting seat to function as a reinforcing portion of the optical device housing.
In addition, if the mounting seat also serves as a harness guide for guiding the wiring path of the wire harness, the configuration can be simplified.

  According to the present invention, in an image forming apparatus of a type in which a plurality of laser beam lights are scanned in different directions by a single light scanning means (polygon mirror and its driving motor, etc.), flare in a housing that accommodates optical equipment. Responding to variations in light and airflow (for example, variations in production lot units), the mounting position of the flare light shielding part and airflow rectification part can be flexibly adjusted. As a result, the optical path and airflow of flare light can be adjusted. It is possible to prevent deterioration in image quality due to variations in the image quality.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
1 is a schematic cross-sectional view of the main part of the image forming apparatus X according to the embodiment of the present invention, FIG. 2 is a plan view of the optical unit Y included in the image forming apparatus X, and FIG. 3 is a cross-sectional view of the optical unit Y. 4 is a perspective view of a mounting member Z1, which is an example of a component of the optical unit Y, FIG. 5 is a side view of the mounting member Z1, and FIG. 6 is a plan view and a side view of a mounting seat disposed in the optical unit Y. 7 is a perspective view of a mounting member Z2 which is an example of a part of the optical unit Y, FIG. 8 is a side view of the mounting member Z2, and FIG. 9 is a perspective view of a mounting member Z1 ′ which is an example of a part of the optical unit Y. is there.

First, the configuration of the image forming apparatus X according to the embodiment of the present invention will be described with reference to FIG.
The image forming apparatus X is a so-called tandem color image forming apparatus, and as shown in FIG. 1, a plurality of image forming units 01 to 04, an intermediate transfer belt 8, a belt support roller 7, and two optical units. Y1 and Y2 are provided. The two optical units Y1 and Y2 have the same configuration. Hereinafter, these units are collectively referred to as an optical unit Y.
The image forming units 01 to 04 execute an electrophotographic image forming process in which toner images of different colors are transferred from the photosensitive drums 11 to 14 (image carrier) to the moving intermediate transfer belt 8. is there. In the example shown in FIG. 1, the black image forming unit 01, the yellow image forming unit 02, the cyan image forming unit 03, and the magenta image forming unit 04 sequentially from the downstream side in the moving direction of the intermediate transfer belt 8. Are arranged in a row.
Each of the image forming units 01 to 04 includes photosensitive drums 11 to 14 that carry toner images, charging devices 21 to 24 that charge the surfaces of the photosensitive drums 11 to 14, and surfaces of the charged photosensitive drums 11 to 14. Developing devices 41 to 44 for developing the electrostatic latent image written by the irradiation (exposure) of the laser beam 31 to 34 with toner, and an intermediate transfer belt 8 for moving the toner image on the rotating photosensitive drums 11 to 14. Are provided with primary transfer devices 51 to 54 for transferring the toner, cleaning devices 61 to 64 for removing residual toner images on the photosensitive drums 11 to 14, and the like.
Further, laser beam lights 31 and 32 for writing electrostatic latent images to the black and yellow photosensitive drums 11 and 12 are output from one optical unit Y1, and are used for cyan and magenta photosensitive drums 13, respectively. , 14 are outputted from the other optical unit Y2.

The intermediate transfer belt 8 is an endless belt made of a material such as rubber or urethane, and is supported and rotated by a belt support roller 7. As a result, the intermediate transfer belt 8 moves while the surface thereof is in contact with the surfaces of the photosensitive drums 11 to 14. Then, when the surface of the intermediate transfer belt 8 passes between the photosensitive drums 11 to 14 and the primary transfer devices 51 to 54, the toner image is transferred from the photosensitive drums 11 to 14.
Further, the image forming apparatus X includes a secondary transfer device 72 that transfers the toner image transferred to the intermediate transfer belt 8 onto the recording paper, a fixing device 73 that heats and fixes the toner image transferred onto the recording paper, and a secondary transfer device. A conveyance roller 71 for feeding the recording paper to 72, a paper discharge roller 74 for discharging the recording paper on which the toner image is heated and fixed toward the paper discharge tray 75, and the like are also provided. Note that the image forming apparatus X includes a sheet feeding cassette that stores recording sheets before image formation on the lower side of the apparatus and feeds the recording sheets one by one to the conveyance path. Description is omitted.
As described above, the image forming apparatus X forms a color toner image on the surface of the intermediate transfer belt 8 by transferring the toner images of the respective colors on the intermediate transfer belt 8 by the plurality of image forming units 01 to 04. Further, the color toner image is transferred from the intermediate transfer belt 8 to the recording paper by the secondary transfer device, thereby forming a color image on the recording paper.

Next, the optical unit Y will be described with reference to FIGS. 2 is a plan view of the optical unit Y, and FIG. 3 is a cross-sectional view of the optical unit Y (AA cross-sectional view in the plan view of FIG. 2). Here, FIG. 3 is an enlarged view of the cross section of the optical unit Y in FIG.
The optical unit Y includes a laser diode (not shown) that emits laser beam lights 31 to 34 for writing electrostatic latent images, and the laser beam lights 31 to 34 (in the direction of the rotation axis of the photosensitive drums 11 to 14). And various optical devices for scanning in the scanning direction) and an optical device housing case u0 for housing them.
The optical equipment housed in the optical equipment housing u0 includes an optical scanner u1, an F-theta (fθ) lens u2, a reflection mirror u3, and the like. The laser diode is attached to the inside or the outside of the optical equipment housing u0.
The image forming apparatus X scans two laser beam lights (31 and 32) or (33 and 34) by one optical scanner u1 in order to reduce the size of the apparatus, save power, and reduce the number of parts. An optical system (the double optical scanning optical system).
That is, the optical scanner u1 provided for each of the optical units Y has two laser beam lights (31 and 32) or (33 and 34) for writing electrostatic latent images incident from different directions. ) Are scanned in different directions. The optical scanner u1 includes a polygon mirror that rotates while reflecting the laser beam, a motor that rotates the polygon mirror, a drive circuit for the motor, and the like.

FIG. 2 shows an optical path in which two laser beam lights are incident and reflected on the polygon mirror portion of the optical scanner u1 and reach the fθ lens u2 by thick solid arrows. Further, in FIG. 2, a part of one laser beam light (for example, 2 to 3% of the total light amount) reaching the fθ lens u2 is reflected by the fθ lens u2 by the thick wavy arrow and flare light P The optical path through which the flare light P enters the scanning lens system of the other laser beam is shown. Such flare light P needs to be blocked (light-shielded) before being mixed into the scanning lens system in order to prevent image quality deterioration of the formed image.
In the image forming apparatus X, a mounting member Z1, which is a component for blocking the flare light P, is mounted inside the optical device housing u0.

Next, the mounting member Z1 and the mounting seat u10 that is the mounting destination will be described with reference to FIGS. 4 is a perspective view of the mounting member Z1, and FIG. 5 is a side view of the mounting member Z1.
As shown in FIG. 2, the mounting seat u10 is formed in a strip shape extending in the laser beam light scanning direction (left-right direction in FIG. 2), and traverses the optical device housing u0 in the main scanning direction. Is formed.
Further, as shown in FIG. 3, the mounting seat u10 is formed with a bottom plate portion u11 and side wall portions u12 on both sides of the bottom plate portion u11, and has a U-shaped cross section (or U shape). It is also a member formed in a groove shape whose inside extends in the longitudinal direction. The mounting seat u10 is a member that also serves as a harness guide that guides the wiring path of the wire harness with a wire harness wired in the inner groove-like portion. Also, as shown in FIG. The bottom plate portion u11 is formed with a slit portion u13 that is a strip-shaped opening along the longitudinal direction thereof.
On the other hand, as shown in FIGS. 4 and 5, the mounting member Z1 is a member integrally formed of, for example, resin or the like, and includes a shaft portion t1 inserted through the slit portion u13 of the mounting seat u10, and its shaft. A plate-like action part t2 fixed to one end of the part t1 and two flange parts t3, t4 fixed (held) on the opposite side of the action part t2 in the shaft part t1 are formed.
The action part t2 is a part that blocks the optical path of the flare light P caused by the laser beam light.
Further, the two flange portions t3 and t4 that are fixed to the shaft portion t1 with a gap between them are portions on both sides of the slit portion u13 (the bottom plate portion) at an arbitrary position of the slit portion u13. This is a portion (an example of the engaging portion) that engages with the mounting seat u10 by sandwiching u11) from both the front and back sides. The two flange portions t3 and t4 sandwich the bottom plate portion u11 due to their elasticity.

As shown in FIGS. 4 and 5, one flange part t4 has one slit part t4 in which the two flange parts t4 sandwich the both sides of the slit part u13 (hereinafter referred to as an engaged state). Protrusions t5 that are in contact with the surfaces of the bottom plate u11 on both sides are formed. The protrusion t5 is formed in a shape (for example, hemispherical) whose top is smoothly curved. The distance L between the two flanges t3 and t4 (in the example of FIG. 4, the distance between the surface of one flange t3 and the top of the projection t5 which is a part of the other flange t4) is The interval is set slightly smaller than the thickness of the portions on both sides of the slit portion u13 (the bottom plate portion u11) in the mounting seat u10.
Further, as shown in FIG. 4, a tip of a jig (driver or the like) for rotating the attachment member Z1 around its shaft portion t1 is inserted into one flange portion 14, A jig insertion groove t6 that engages in the rotation direction about the shaft portion t1 is provided.

5A and 5B show a state where the shaft portion t1 of the attachment member Z1 is inserted through the slit portion u13 of the attachment seat u10. 5A shows a state in which the protrusion t5 of the attachment member Z1 is positioned at the slit portion u13 (hereinafter referred to as a non-engagement state), and FIG. 5A shows a protrusion of the attachment member Z1. t5 represents a state of contacting the surface of the bottom plate portion u11 on both sides of the slit portion u13 (the engaged state).
When attaching the attachment member Z1 to the attachment seat u10, the jig inserted into the jig insertion groove t6 is rotated about 90 degrees with the shaft portion t1 inserted through the slit portion u13. As a result, the protrusion t5 rides from the position of the slit portion u13 (the state shown in FIG. 5A) on both sides of the slit portion u13 (surface of the bottom plate portion u11) and slides between the two flanges. The portions t3 and t4 shift to the engaged state (the state shown in FIG. 5B) where the bottom plate portion u11 is sandwiched from both the front and back sides. According to this configuration, the sliding frictional resistance is smaller than when the protrusion t5 is not provided (when the two flange portions t3 and t4 are in surface contact with the surface of the bottom plate portion u11). The rotation operation (attachment operation) of the attachment member Z1 becomes easy.
As described above, the two flange portions t3 and t4 fixed to the shaft portion t1 respond to the rotation around the shaft portion t1 in a state where the shaft portion t1 is inserted into the slit portion u13 of the mounting seat u10. Then, from the disengaged state (the state shown in FIG. 5A) where the protrusion t5 is located at the slit u13, the engagement where the protrusion t5 contacts the surface of the bottom plate u11 on both sides of the slit u13. Transition to the state (the state of FIG. 5B). In this engaged state, the mounting member Z1 is held by the mounting seat u10.
Here, the two flange portions t3 and t4 in the mounting member Z1 can be engaged with the mounting seat u10 at any position within the formation range of the slit portion u13 along the mounting seat u10. The mounting member Z1 is held in the optical equipment housing u0.

FIG. 6 is a plan view (a) and a side view (b) of a part of the mounting seat u10.
In the mounting member Z1 shown in FIG. 4, the lengths and widths of the two flange portions t3 and t4 (in the example of FIG. 4, the diameters of the disk-shaped flange portions t3 and t4) are all the same as the slit portion u13. It is formed larger than the width. Therefore, a member for inserting the working portion t2 and the flange portion t3 nearer to the action portion t2 or the flange portion t4 farther from the action portion t2 into a part of the slit portion u13 in the mounting seat u10. An insertion opening u15 is provided. The attachment position of the attachment member Z1 is obtained by inserting the action portion t2 and the one flange portion t3 or the other flange portion t4 through the member insertion opening u15 and moving the attachment member Z1 along the slit portion u13. The (engagement position) can be arbitrarily determined.

Further, as shown in FIGS. 6 and 5, the mounting seat u10 has recesses u14 into which the protrusions t5 are fitted in the engaged state, on both sides of the slit portion u13 (the bottom plate portion u11). Are formed side by side along the slit portion u13.
Accordingly, the operator rotates the mounting member Z1 with the shaft portion t1 inserted through the slit portion u13, so that the projection portion t5 is placed on the surface of the bottom plate portion u11 on both sides of the slit portion u13. When the operator slides and fits into the recess u14, the operator feels a click feeling, and the click feeling can confirm that the engaged state is achieved, thereby improving workability.
Further, as shown in FIG. 6B, the mounting seat u10 is provided with a scale u16 for identifying the engagement positions of the two flange portions t3 and t4 in the mounting member Z1.
As a result, when it is necessary to change the mounting position of the mounting member Z1 due to variations in the dimensions of the optical device housing u0, the mounting position can be easily confirmed, and workability is improved.

Next, with reference to the perspective view shown in FIG. 7 and the side view shown in FIG. 8, a mounting member Z2 which is another embodiment of the component mounted on the mounting seat u10 will be described. 7 and 8, the same components as those of the attachment part Z1 are denoted by the same reference numerals.
As shown in FIGS. 7 and 8, the mounting member Z2 is a member made of resin or the like, for example, a shaft portion t1 inserted through the slit portion u13 of the mounting seat u10, and one end of the shaft portion t1. The fixed working portion t2 (flare light blocking portion), one flange portion t3 (hereinafter referred to as a fixed flange portion t3) fixed (held) to the shaft portion t1, and independent members, And a member held by the shaft portion t1 (hereinafter, referred to as a mounting rod member t4 ′). The mounting rod member t4 ′ is an independent member in which the insertion hole t7 of the shaft portion t1 is formed. The shaft portion t1 is provided with a retaining portion t8 that engages with the mounting rod member t4 ′.
As shown in FIG. 8, the attachment member Z2 has its shaft portion t1 inserted into the slit portion u13 and the insertion hole t7 of the attachment flange member t4 ′, and the edge of the insertion hole t7 of the attachment flange member t4 ′. Engages with a retaining portion t8 provided on the shaft portion t8, so that the fixing flange portion t3 and the attachment flange member t4 ′ cause the bottom plate portion u11 on both sides of the slit portion u13 to be moved from both the front and back sides. The engaged state is held.
The retaining portion t8 is formed in a tapered shape whose diameter gradually increases from the end portion side of the shaft portion t1 inserted into the insertion hole t7 of the mounting rod member t4 ′ to the opposite side thereof. It is almost trapezoidal. In the tapered retaining part t8, the diameter of the thinnest part is smaller than the inner diameter of the insertion hole t7, and the diameter of the thickest part is slightly larger than the inner diameter of the insertion hole t7. When the retaining portion t8 is inserted into the insertion hole t7 of the mounting rod member t4 ′ while being pressed, the entire retaining portion t8 passes through the insertion hole t7 due to elastic deformation of the mounting flange member t4 ′. The edge portion of the insertion hole t7 engages with the largest diameter portion of the retaining portion t8.
The image forming apparatus X provided with such an attachment member Z2 is also an example of an embodiment of the present invention.
In addition, you may provide the said projection part t5 with which the said attachment member Z1 is provided also in the said fixing collar part t3 or the said attachment collar member t4 'in the said attachment member Z2.

Next, an attachment member Z1 ′, which is a modification of the attachment member Z1, will be described with reference to a perspective view shown in FIG. In FIG. 9, the same components as those of the attachment part Z1 are denoted by the same reference numerals.
The portion where the mounting member Z1 ′ is different from the mounting member Z1 is only the shape of one flange portion t3.
That is, in the attachment member Z1, since the diameter of the disk-shaped flange part t3 is larger than the width of the slit part u13, a member insertion opening for inserting the flange part t3 into a part of the slit part u13 It was necessary to provide the part u15.
On the other hand, in the attachment member Z1 ′, the length of the rectangular parallelepiped flange portion t3 is larger than the width of the slit portion u13, but the width of the flange portion t3 is smaller than the width of the slit portion u13. For this reason, in the arbitrary position of the slit part u13, the action part t2 and the one flange part t3 can be inserted into the slit part u13, and the attachment member Z1 ′ can be rotated by rotating at the inserted position. Can be held on the mounting seat u10.
The image forming apparatus X provided with such an attachment member Z1 ′ is also an example of an embodiment of the present invention.
The protrusion t5 may be provided on both of the two flanges t3 and t4. However, in that case, it is desirable to provide three or more protrusions t5 for each of the flanges t3 and t4 in order to stabilize the holding with respect to the mounting seat u10.
In the embodiment described above, the action portion t2 of the attachment members Z1, Z2, and Z1 ′ is a light-shielding portion for the flare light P. However, the action portion t2 is within the optical device housing case u0. It is also conceivable that the rectifying unit rectifies the air flow. This adjusts the air flow so that the temperature distribution of the optical device (especially the lens) in the optical device housing u0 does not increase in accordance with variations in the dimensions and the like of the optical device housing u0. Becomes easy.

  The present invention can be used for an image forming apparatus.

1 is a schematic sectional view of a main part of an image forming apparatus X according to an embodiment of the present invention. FIG. 3 is a plan view of an optical unit Y included in the image forming apparatus X. Sectional drawing of the optical unit Y. FIG. The perspective view of the attachment member Z1 which is an example of the components of the optical unit Y. FIG. The side view of the attachment member Z1. The top view and side view of a mounting seat arrange | positioned in the optical unit Y. FIG. The perspective view of the attachment member Z2 which is an example of the components of the optical unit Y. FIG. The side view of the attachment member Z2. The perspective view of the attachment member Z1 'which is an example of the components of the optical unit Y. FIG.

Explanation of symbols

X: image forming apparatus 7: belt support roller 8: intermediate transfer belts 11-14: photosensitive drums 21-24: charging devices 31-34: laser beam lights 41-44: developing devices 51-54: primary transfer devices 61- 64: Cleaning device 71: Conveying roller 72: Secondary transfer device 73: Fixing device 74: Paper discharge roller 75: Paper discharge tray Y1, Y2: Optical units Z1, Z2, Z1 ′: Mounting member t1: Shaft portion t2: Action Part t3, t4: flange part t5: protrusion t6: jig insertion groove t7: insertion hole t8: retaining part u0: optical device housing u1: optical scanner u2: fθ lens u3: reflection mirror u10: mounting seat u11: Bottom plate portion u12: Side wall portion u13: Slit portion u14: Depression portion u15: Member insertion opening u16: Scale P: Flare light

Claims (9)

Optical scanning means for scanning a plurality of light beams for writing electrostatic latent images incident from different directions while reflecting them in different directions, and an optical equipment housing case in which an optical equipment including the optical scanning means is housed An optical unit comprising:
A mounting seat which is made form the optical device accommodating housing,
An attachment member formed with an action part for blocking an optical path of flare light caused by the beam light or rectifying an air flow in the optical equipment housing and an engagement part engaging with the attachment seat; Equipped,
It said mounting member is held in the optical device accommodating housing by engagement of the engagement portion relative to said mounting seat,
The mounting seat is a member formed with a slit that is an opening;
The engaging portion of the mounting member includes a shaft portion inserted through the slit portion and two flange portions held by the shaft portion ,
The engagement portion engages with the mounting seat by sandwiching the portions on both sides of the slit portion from the front and back both sides at an arbitrary position of the slit portion,
From the non-engaged state where the two flanges fixed to the shaft portion do not sandwich the portions on both sides of the slit portion according to the rotation of the attachment member about the shaft portion. An optical unit , wherein the optical unit is shifted to an engaged state that sandwiches both sides of the slit portion . One or both of the two flanges are formed with protrusions that contact the surfaces of both sides of the slit portion in the engaged state,
When the engaging portion of the mounting member rotates around the shaft portion, the protruding portion is located on both sides of the slit portion from the disengaged state where the protruding portion is positioned on the slit portion. The optical unit according to claim 1 , wherein the optical unit is shifted to the engaged state in contact with a surface. 3. The optical unit according to claim 2 , wherein a plurality of depressions into which the protrusions are fitted in the engaged state are formed in a row along the slits on the surfaces of both sides of the slits in the mounting seat. . Optical scanning means for scanning a plurality of light beams for writing electrostatic latent images incident from different directions while reflecting them in different directions, and an optical equipment housing case in which an optical equipment including the optical scanning means is housed An optical unit comprising:
A mounting seat formed in the optical equipment housing;
An attachment member formed with an action part for blocking an optical path of flare light caused by the beam light or rectifying an air flow in the optical equipment housing and an engagement part engaging with the attachment seat; Equipped,
The mounting member is held in the optical equipment housing by the engagement of the engaging portion with the mounting seat;
The mounting seat is a member formed with a slit that is an opening;
The engaging portion of the mounting member includes a shaft portion inserted through the slit portion and two flange portions held by the shaft portion ,
The engagement portion engages with the mounting seat by sandwiching the portions on both sides of the slit portion from the front and back both sides at an arbitrary position of the slit portion,
In the mounting member, the two flange portions are composed of a fixed flange portion fixed to the shaft portion and an independent mounting rod member in which an insertion hole of the shaft portion is formed,
The shaft portion is inserted into the slit portion and the insertion hole of the mounting rod member, and an edge portion of the insertion hole of the mounting rod member is engaged with a retaining portion provided in the shaft portion, thereby fixing the fixing rod. An optical unit that is in an engaged state in which the portion and the mounting rod member sandwich the portions on both sides of the slit portion. The optical unit according to claim 1, wherein the opening has a band shape . It said mounting seat, the optical unit according to any one of claims 1 to 5 scale for identifying the engaged position of the engaging portion is marked in the mounting member. The mounting locus, optical unit according to any one of claims 1 to 6 comprising formed across said optical device accommodating housing. The optical unit according to any one of the mounting locus, claim 1-7 comprising also serves as a harness guide for guiding the wiring path of the wire harness. An image forming apparatus comprising the optical unit according to claim 1.

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