JP6358196B2 - Mirror support structure, optical scanning device, image forming apparatus - Google Patents

Description

  The present invention relates to a mirror support structure that supports a reflection mirror that reflects light, an optical scanning device, and an image forming apparatus.

  An electrophotographic image forming apparatus includes an optical scanning device that forms an electrostatic latent image based on image data on an image carrier by scanning with laser light. In this type of optical scanning device, laser light emitted from a light source is scanned by an optical scanning unit such as a polygon mirror. The laser light scanned by the optical scanning unit is reflected by one or a plurality of reflecting mirrors that are long in the scanning direction of the laser light and guided to the image carrier.

  Here, the reflection mirror may be supported at two points by a first support portion provided at one end portion in the longitudinal direction of the reflection mirror, and may be supported at one point by a second support portion provided at the other end portion. (For example, refer to Patent Document 1). For example, in the second support portion, an urging portion that elastically urges the reflection mirror by making contact with one point of the reflection surface of the reflection mirror, and a movement of the reflection mirror by making contact with one point of the back surface of the reflection mirror And a regulation unit that regulates.

JP 2003-121774 A

  By the way, in the second support portion, the urging portion contacts an intersection of the reflection surface and a straight line that is perpendicular to the reflection surface of the reflection mirror and passes through a contact point between the reflection mirror and the restriction portion. If it is the structure which does, there exists a possibility that the said reflective mirror may vibrate centering | focusing on the said contact point. For example, in the optical scanning device, there is a possibility that the scanning accuracy of the laser beam is lowered, and in the image forming device, there is a possibility that the image quality is lowered due to the vibration of the reflection mirror in the optical scanning device.

  An object of the present invention is to provide a mirror support structure, an optical scanning device, and an image forming apparatus that can suppress vibration of a reflecting mirror.

  A mirror support structure according to one aspect of the present invention includes a first restricting portion, a first urging portion, a second restricting portion, and a second urging portion. The first restricting portion restricts the movement of the reflecting mirror by contacting the first surface of the reflecting mirror at a plurality of points at one end in the longitudinal direction of the long reflecting mirror that reflects light. The first biasing portion elastically biases the reflection mirror by contacting a second surface of the reflection mirror opposite to the first surface at the one end. The second restricting portion restricts the movement of the reflecting mirror by contacting the first surface of the reflecting mirror at one point at the other end in the longitudinal direction of the reflecting mirror. The second urging portion includes a first straight line that is perpendicular to the second surface of the reflecting mirror at the other end and passes through a contact point between the second restricting portion and the first surface, and the second The reflecting mirror is elastically energized by contacting at a point on the second surface excluding the intersection with the surface.

  An optical scanning device according to another aspect of the present invention includes the mirror support structure, and the reflection mirror is used for reflection of laser light emitted from a light source and scanned by an optical scanning unit.

  An image forming apparatus according to another aspect of the present invention includes the optical scanning device and an image forming unit including an image carrier on which an electrostatic latent image is formed by light emitted from the optical scanning device.

  According to the present invention, there are provided a mirror support structure, an optical scanning device, and an image forming apparatus capable of suppressing vibration of a reflection mirror.

FIG. 1 is a diagram showing a configuration of an image forming apparatus according to the first embodiment of the present invention. FIG. 2 is a schematic diagram illustrating an example of a mirror support structure included in the optical scanning device according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view showing an example of a mirror support structure according to the first embodiment of the present invention. FIG. 4 is a cross-sectional view showing an example of a mirror support structure according to the first embodiment of the present invention. FIG. 5 is a cross-sectional view showing an example of a mirror support structure according to the second embodiment of the present invention. FIG. 6 is a sectional view showing another example of the mirror support structure according to the second embodiment of the present invention. FIG. 7 is a sectional view showing another example of the mirror support structure according to the second embodiment of the present invention. FIG. 8 is a cross-sectional view showing an example of a mirror support structure according to the third embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The description may be made using the up / down / left / right or front / rear directions defined in the accompanying drawings. The following embodiments are examples embodying the present invention, and do not have the character of limiting the technical scope of the present invention. Furthermore, the configurations of the respective embodiments can be arbitrarily combined.

[First Embodiment]
As shown in FIG. 1, an image forming apparatus 10 according to an embodiment of the present invention includes a plurality of image forming units 1 to 4, an intermediate transfer belt 5, an optical scanning device 6, a secondary transfer roller 7, and a fixing device 8. , A color printer including a paper discharge tray 9, a paper feed cassette 21, a transport path 22, and the like. The image forming apparatus 10 forms a monochrome image or a color image on a sheet such as paper based on the input image data. The image forming apparatus according to the present invention may be, for example, a facsimile machine, a copier, or a multifunction machine.

  Each of the image forming units 1 to 4 is an electrophotographic image forming unit including a photosensitive drum (image carrier), a charging device, a developing device, a primary transfer roller, and a cleaning device. The image forming units 1 to 4 are juxtaposed along the traveling direction of the intermediate transfer belt 5 and constitute a so-called tandem image forming unit. Specifically, toner images corresponding to C (cyan) in the image forming unit 1, M (magenta) in the image forming unit 2, Y (yellow) in the image forming unit 3, and K (black) in the image forming unit 4 are formed. Is done. The intermediate transfer belt 5 is an intermediate transfer member to which toner images of respective colors formed on the photosensitive drums of the image forming units 1 to 4 are intermediately transferred.

  The optical scanning device 6 scans the photosensitive drums of the image forming units 1 to 4 with the laser light emitted from the light source based on the input image data of each color, thereby electrostatic latent images on the photosensitive drums. Form an image. Specifically, the optical scanning device 6 includes a unit housing 60, a light source unit 61, a polygon mirror 62, a reflection mirror 63, a first scanning lens 64, a second scanning lens 65, and the like.

  The light source unit 61 includes a light source that emits laser light corresponding to each of the image forming units 1 to 4 and various optical components. The polygon mirror 62 is an optical scanning unit that scans each laser beam emitted from the light source unit 61 along a predetermined scanning direction. Each laser beam scanned by the polygon mirror 62 is guided to the reflection mirror 63 through the first scanning lens 64 and the second scanning lens 65. The first scanning lens 64 is also used as a scanning lens for a plurality of laser beams. The reflection mirror 63 is long in the scanning direction of the laser beam by the polygon mirror 62, reflects each laser beam scanned by the polygon mirror 62, and irradiates the photosensitive drum of each of the image forming units 1 to 4. . In the optical scanning device 6, any one or a plurality of reflection mirrors 63 corresponding to the image forming units 1 to 4 are supported by the mirror support structure 20.

  In the image forming apparatus 10 configured as described above, a color image is formed on a sheet supplied from the paper feed cassette 21 along the conveyance path 22 in the following procedure, and the sheet after image formation is discharged to the paper discharge tray 9. Is done. The transport path 22 is provided with various transport rollers that transport the sheets stacked on the paper feed cassette 21 to the paper discharge tray 9 via the secondary transfer roller 7 and the fixing device 8.

  First, in each of the image forming units 1 to 4, the photosensitive drum is uniformly charged to a predetermined potential by the charging device. Next, laser light based on image data is scanned on the surface of each of the photosensitive drums by the optical scanning device 6, thereby forming an electrostatic latent image on the surface of each of the photosensitive drums. The electrostatic latent image on each of the photosensitive drums is developed (visualized) as a toner image of each color by each of the developing devices. Each developing device is supplied with toner (developer) from removable toner containers 11 to 14 corresponding to the respective colors.

  Subsequently, the toner images of the respective colors formed on the photosensitive drums of the image forming units 1 to 4 are sequentially superimposed and transferred onto the intermediate transfer belt 5 by the primary transfer rollers. As a result, a color image based on the image data is formed on the intermediate transfer belt 5. Next, the color image on the intermediate transfer belt 5 is transferred by the secondary transfer roller 7 to a sheet conveyed from the paper feed cassette 21 via the conveyance path 22. Thereafter, the color image transferred to the sheet is heated and fixed on the sheet by the fixing device 8. The toner remaining on the surface of each photoconductor drum is removed by each cleaning device.

  Hereinafter, the mirror support structure 20 included in the optical scanning device 6 will be described with reference to FIGS. FIG. 2 is a schematic diagram illustrating a schematic configuration of the mirror support structure 20, and FIGS. 3 and 4 are cross-sectional views illustrating an example of the mirror support structure 20.

  As shown in FIG. 2, the mirror support structure 20 supports a first support portion 81 that supports one end 63 </ b> A in the longitudinal direction of the reflection mirror 63 at multiple points, and a single point support for the other end 63 </ b> B in the longitudinal direction of the reflection mirror 63. And a second support portion 91.

  As shown in FIGS. 2 and 3, the first support portion 81 includes a first restricting portion 810 and a first urging portion 820. The first restricting portion 810 restricts the movement of the reflecting mirror 63 by contacting the back surface 632 of the reflecting mirror 63 opposite to the reflecting surface 631 at a plurality of points at the one end 63A. The first biasing portion 820 elastically biases the reflection mirror 63 by contacting the reflection surface 631 on the opposite side of the back surface 632 of the reflection mirror 63 at the one end portion 63A. In addition, the reflective surface 631 and the back surface 632 are parallel.

  In the present embodiment, the reflective surface 631 is the second surface that contacts the first urging portion 820, and the back surface 632 is the first surface that contacts the first restricting portion 820. On the other hand, a configuration in which the back surface 632 is the second surface that contacts the first urging portion 820 and the reflection surface 631 is the first surface that contacts the first restricting portion 820 is also conceivable as another embodiment.

  The first restricting portion 810 includes two contact portions 811 and a bottom surface support portion 812. Each of the contact portions 811 is a protrusion formed on the unit housing 60 with a contact surface with the reflection mirror 63 having an arcuate cross section. The contact surface of the contact portion 811 may be flat or pointed. Each of the contact portions 811 is provided at a different position in the lateral direction perpendicular to the longitudinal direction on the back surface 632 of the reflection mirror 63. That is, the first restricting portion 810 supports the back surface 632 of the reflecting mirror 63 at two points by the two contact portions 811. The bottom surface support portion 812 is a protrusion formed on the unit housing 60, and contacts the bottom surface 633 of the reflection mirror 63 to support the reflection mirror 63.

  In the mirror support structure 20, the reflection mirror 63 is supported at two points by the two contact portions 811 at the one end portion 63 </ b> A, thereby setting the inclination angle of the reflection surface 631 of the reflection mirror 63. That is, the angle of the straight line connecting the contact points of the contact portions 811 with the back surface 632 of the reflection mirror 63 is the inclination angle of the reflection surface 631 of the reflection mirror 63.

  The first urging unit 820 includes an elastic member 821. The elastic member 821 has a pressing portion 822 that contacts the reflecting surface 631 of the reflecting mirror 63 at a single point, and the pressing portion 822 elastically biases the reflecting surface 631 of the reflecting mirror 63. The pressing portion 822 is in contact with the reflecting surface 631 at one point excluding the center of the reflecting surface 631 of the reflecting mirror 63 in the short direction of the reflecting mirror 63. Specifically, in the example shown in FIG. 3, the pressing portion 822 is in contact with the lower right region of the reflecting surface 631 than the center of the reflecting mirror 631 in the short direction. The pressing portion 822 may be in contact with the center of the reflecting mirror 631 in the short direction on the reflecting surface 631.

  Thus, at the one end portion 63A of the reflection mirror 63, the reflection mirror 63 is supported while being sandwiched by the first restricting portion 810 and the first biasing portion 820. The elastic member 821 is a leaf spring in which the pressing portion 822 can be displaced in an arc shape around an axis parallel to the longitudinal direction of the reflection mirror 63. The elastic member 821 is fixed to a fixing portion 823 formed on the unit housing 60, for example.

  On the other hand, as shown in FIGS. 2 and 4, the second support portion 91 includes a second restricting portion 910 and a second urging portion 920. The second restricting portion 910 restricts the movement of the reflecting mirror 63 by contacting the back surface 632 of the reflecting mirror 63 at one point of the first contact point P1 at the other end 63B. The second urging unit 920 contacts the reflection surface 631 of the reflection mirror 63 at one point of the second contact point P2 at the other end 63B, and elastically urges the reflection mirror 63.

  Incidentally, in the second support portion 91, the second urging portion 920 contacts the intersection of the first straight line Q1 that passes through the first contact point P1 and is perpendicular to the reflection surface 631 of the reflection mirror 63 and the reflection surface 631. If it is the structure to perform, there exists a possibility that the reflective mirror 63 may vibrate centering on the 1st contact point P1. For example, in the optical scanning device 6, there is a possibility that the scanning accuracy of the laser light is lowered, and in the image forming device 10, there is a possibility that the image quality is lowered due to the vibration of the reflection mirror 63 in the optical scanning device 6. On the other hand, in the mirror support structure 20 according to the present embodiment, it is possible to suppress the vibration of the reflection mirror 63 as described below.

  First, as illustrated in FIG. 4, the second restriction portion 910 of the second support portion 91 includes a support plate 911 and a position adjustment portion 912. The support plate 911 is fixed to the unit housing 60 by being screwed into the screw holes 601 formed in the unit housing 60 with screws 602.

  The position adjustment unit 912 is fixed to the support plate 911 and can adjust the inclination between the one end 63A and the other end 63B of the reflection mirror 63. Specifically, the position adjustment unit 912 includes a contact unit 913, a tip holding unit 914, a first drive unit 915, a second drive unit 916, and a fixing screw 917. Note that the position adjustment unit 912 is not limited to the configuration described here, and may have another configuration as long as the inclination between the one end 63A and the other end 63B of the reflection mirror 63 can be adjusted.

  The contact portion 913 is integrally configured with the first drive portion 915, and contacts the back surface 632 of the reflection mirror 63 at one point of the first contact point P1 with an arc-shaped contact surface formed at the tip. Here, the first contact point P1 is, for example, the center in the lateral direction on the back surface 632 of the reflecting mirror 63. Note that the first contact point P <b> 1 may not be the center in the lateral direction on the back surface 632 of the reflection mirror 63.

  The tip holding portion 914 is configured integrally with the support plate 911 and suppresses axial blurring of the contact portion 913 that is inserted into the opening 9141 formed in the tip holding portion 914. Note that the tip holding portion 914 may be omitted. Further, the tip holding portion 914 may be provided with a restriction portion that restricts the movement of the upper surface and the bottom surface 633 of the reflection mirror 63.

  The first drive unit 915 and the second drive unit 916 are a pair of meshing worm wheels and worm gears, and the first drive unit 915 rotates with the rotation of the second drive unit 916. The second drive unit 916 is rotated manually by the operator during manufacture or maintenance of the optical scanning device 6. For example, a + or − groove is formed at the end of the second drive unit 916 in the axial direction, and the operator can rotate the second drive unit 916 using a tool such as a plus driver or minus driver. Configuration is conceivable. Further, the first driving portion 915 is formed with a screw hole 918 into which the fixing screw 917 is screwed.

  The fixing screw 917 is fixed to the support plate 911 so as not to rotate, and is screwed into a screw hole 918 formed in the first driving unit 915. Thus, when the second drive unit 916 rotates and the first drive unit 915 rotates, the first drive unit 915 moves along the movement direction D1 parallel to the axial direction of the fixing screw 917. That is, in the position adjustment unit 912, the contact unit 913 can move along the moving direction D1 together with the first driving unit 915 by driving the second driving unit 916, and the one end 63A and the other end 63B of the reflecting mirror 63 can move. The slope between is adjustable.

  The second urging unit 920 has an elastic member 921. The elastic member 921 is a leaf spring that elastically biases the reflection surface 631 with a pressing portion 922 that can be displaced in an arc shape around an axis parallel to the longitudinal direction of the reflection mirror 63. The elastic member 921 is fixed to a fixing portion 923 formed in the unit housing 60, for example.

  Then, the elastic member 921 is an intersection of the reflecting surface 631 and the first straight line Q1 that is perpendicular to the reflecting surface 631 of the reflecting mirror 63 and passes through the first contact point P1 between the reflecting mirror 63 and the second restricting portion 910. The reflection mirror 63 is elastically biased by contacting a point on the reflection surface 631 except the contact portion with the pressing portion 922. Specifically, in the mirror support structure 20, the contact portion 913 of the second restricting portion 910 is in contact with the center in the short direction of the reflection mirror 63 on the back surface 632. Therefore, the elastic member 921 comes into contact with the reflection surface 631 at one point excluding the center of the reflection surface 631 in the short direction of the reflection mirror 63. In the present embodiment, as shown in FIG. 4, the position adjustment unit 912 is parallel to the moving direction D <b> 1 of the contact unit 913 by the position adjustment unit 912 in a state where the contact adjustment unit 912 is adjusted to a predetermined position. And if the virtual line which passes the 1st contact point P1 of the contact part 913 and the back surface 632 is made into the 2nd straight line Q2, the 1st straight line Q1 and the 2nd straight line Q2 exist in the same straight line form.

  Further, in the elastic member 921, the pressing portion 922 is displaced in an arc shape around an axis parallel to the longitudinal direction of the reflecting mirror 63 as the contact adjustment portion 912 moves by the position adjustment portion 912. The second contact point P2 with the pressing portion 922 at 631 is displaced. Here, in the mirror support structure 20, the elastic member 921 is in a region that does not intersect the first straight line Q <b> 1 on the reflection surface 631 when the contact portion 913 moves within a predetermined movable range by the position adjustment unit 912. The pressing portion 922 is configured to move. Thereby, even if the pressing portion 922 moves on the reflecting surface 631 with the movement of the contact portion 913, the pressing portion 922 does not contact the intersection of the first straight line Q1 and the reflecting surface 631 on the reflecting surface 631.

  For example, in the configuration shown in FIG. 4, the pressing portion 922 is in contact with the lower right area of the first mirror Q1 on the reflecting surface 631 of the reflecting mirror 63 and does not contact the upper left area of the first straight line Q1. It is configured as follows. Note that the pressing portion 922 may be configured to contact a region on the upper left side of the first straight line Q1 and not to a region on the lower right side of the first straight line Q1 on the reflecting surface 631 of the reflecting mirror 63.

  In the mirror support structure 20 configured as described above, a rotational moment in a predetermined direction around the first contact point P1 between the contact portion 913 of the second restricting portion 910 and the back surface 632 of the reflection mirror 63 is a reflection mirror. 63 always acts. Specifically, in the example shown in FIG. 4, a clockwise rotational moment acts on the reflection mirror 63.

  Therefore, in the mirror support structure 20, the reflection mirror 63 is stable and is supported in a strong state against vibration, and the vibration of the reflection mirror 63 is suppressed. Further, in the optical scanning device 6 having the mirror support structure 20, the scanning accuracy of the laser light is increased. In the image forming apparatus 10 on which the optical scanning device 6 is mounted, deterioration of the image quality of the printed matter due to the vibration of the reflection mirror 63 is suppressed.

  In this embodiment, the color-compatible image forming apparatus 10 including a plurality of image forming units 1 to 4 has been described as an example. However, the image forming apparatus according to the present invention is a monochrome image including one image forming unit. The present invention can also be applied to a corresponding image forming apparatus.

[Second Embodiment]
In the first embodiment, the configuration in which the first straight line Q1 and the second straight line Q2 exist on the same straight line has been described. On the other hand, a configuration in which the first straight line Q1 and the second straight line Q2 intersect can be considered as another embodiment. Here, FIG. 5 is a diagram illustrating another example of the mirror support structure 20.

  As shown in FIG. 5, in the mirror support structure 20 according to the second embodiment, the reflection mirror 63 includes the second restricting portion as compared with the mirror support structure 20 according to the first embodiment (see FIG. 4). It is supported in a state where it is rotated by a predetermined amount clockwise around the first contact point P1 between the contact portion 913 of 910 and the back surface 632. That is, in the mirror support structure 20 according to the second embodiment, the reflection mirror 63 is supported in a state where the first straight line Q1 and the second straight line Q2 intersect.

  The pressing portion 922 of the elastic member 921 of the second urging portion 920 is in contact with the reflecting surface 631 in a region opposite to the second straight line Q2 when the first straight line Q1 is used as a reference in the reflecting surface 631. . As a result, the reflecting mirror 63 has a rotational moment acting in a predetermined direction centered on the first contact point P1 between the contact portion 913 and the back surface 632 as compared with the first embodiment. 63 will be supported more stably.

  Further, as shown in FIG. 6, the reflecting mirror 63 is supported in a state of being rotated a predetermined amount counterclockwise around the first contact point P1 between the contact portion 913 of the second restricting portion 910 and the back surface 632. The same applies to the case where it is used. That is, in this case as well, the pressing portion 922 of the elastic member 921 of the second urging portion 920 is located on the reflecting surface 631 in a region opposite to the second straight line Q2 when the first straight line Q1 is used as a reference in the reflecting surface 631. It only has to be in contact. As a result, the reflecting mirror 63 has a rotational moment acting in a predetermined direction centered on the first contact point P1 between the contact portion 913 and the back surface 632 as compared with the first embodiment. 63 will be supported more stably.

  As shown in FIG. 7, the pressing portion 922 of the elastic member 921 of the second urging portion 920 has a reflecting surface 631 in a region on the second straight line Q2 side with respect to the first straight line Q1 in the reflecting surface 631. A configuration in contact with is also conceivable as another embodiment. Even in such a configuration, a rotational moment acts on the reflecting surface 631 of the reflecting mirror 63 in a predetermined direction centered on the first contact point P1, and the reflecting mirror 63 is stably supported. Will be.

  Further, since the first straight line Q1 and the second straight line Q2 may be the same straight line or intersect, the angle of the reflection surface 631 of the reflection mirror 63 is determined by the moving direction D1 of the second support portion 91. The angle is not limited to being perpendicular to the angle. Therefore, in the optical scanning device 6, it is possible to use the same component such as the second support portion 91 for the mirror support structure 20 that supports the plurality of reflection mirrors 63.

[Third Embodiment]
In the first embodiment, a region in the same direction (downward) from the first straight line Q1 on the reflecting surface 631 of the reflecting mirror 63 is elastically biased by the first biasing portion 820 and the second biasing portion 920. Explained. On the other hand, each of the first urging unit 820 and the second urging unit 920 may elastically urge the reflecting mirror 63 by contacting a region in a different direction from the first straight line Q1 on the reflecting surface 631 of the reflecting mirror 63. It can be considered as an embodiment. Here, FIG. 8 is a view showing another example of the mirror support structure 20.

  As shown in FIG. 8, in the mirror support structure 20 according to the third embodiment, the pressing portion 822 of the elastic member 821 of the first urging portion 820 has the second urging portion 920 across the first straight line Q1. The elastic member 921 is in contact with a region opposite to the pressing portion 922 (upper side). In particular, the contact position between the first biasing portion 820 and the surface 631 and the second biasing portion so that the rotational moment acting on the reflection mirror 63 by the first biasing portion 820 and the second biasing portion 920 are equal. The contact position between 920 and the surface 631, the urging forces of the first urging unit 820 and the second urging unit 920, and the like are set. For example, the urging forces of the first urging unit 820 and the second urging unit 920 are the same, and the urging locations by the first urging unit 820 and the second urging unit 920 are equally spaced from the first straight line Q1. It may be set to.

  Even with such a configuration, since the rotational moment acting on the reflection mirror 63 centering on the contact point between the contact portion 913 of the second restricting portion 910 and the back surface 632 of the reflection mirror 63 is offset, the reflection mirror 63 is supported by the mirror. It is stably supported by the structure 20.

1-4 Image forming unit 5 Intermediate transfer belt 6 Optical scanning device 7 Secondary transfer roller 8 Fixing device 9 Paper discharge tray 10 Image forming device 60 Unit housing 61 Light source unit 62 Polygon mirror 63 Reflecting mirror 64 First scanning lens 65 First 2 scanning lens 81 1st support part 810 1st control part 820 1st biasing part 91 2nd support part 910 2nd control part 912 Position adjustment part 913 Contact part 920 2nd biasing part

Claims (7)

A first restricting portion for restricting movement of the reflecting mirror by contacting the first surface of the reflecting mirror at a plurality of points at one end in the longitudinal direction of the long reflecting mirror that reflects light;
A first urging portion that elastically urges the reflection mirror in contact with a second surface opposite to the first surface of the reflection mirror at the one end;
A second restricting portion for restricting movement of the reflecting mirror by contacting the first surface of the reflecting mirror at one point at the other end in the longitudinal direction of the reflecting mirror;
Except for the intersection of the second surface and the first straight line that is perpendicular to the second surface of the reflecting mirror at the other end and passes through the contact point between the second restricting portion and the first surface. A second urging portion that elastically urges the reflecting mirror by contacting at one point on the two surfaces;
Equipped with a,
A position at which the second restricting portion can adjust the inclination between the one end portion and the other end portion of the reflection mirror by the contact portion contacting the first surface of the reflection mirror and the movement of the contact portion. Including an adjustment unit,
The second urging portion elastically urges the second surface with a pressing portion that contacts the second surface of the reflecting mirror,
The pressing portion moves within a region on the second surface where the first straight line does not pass when the contact portion moves within a predetermined movable range by the position adjustment unit;
A second straight line passing through a second contact point between the contact part and the first surface intersects the first straight line, the reflection mirror being parallel to the moving direction of the contact part by the position adjusting part. mirror support structure that will be supported in a state. The contact point is a center in a short direction perpendicular to a longitudinal direction of the reflection mirror on the first surface of the reflection mirror;
The second urging portion elastically urges the reflection mirror in contact with the second surface at one point excluding the center of the second surface perpendicular to the longitudinal direction of the reflection mirror;
The mirror support structure according to claim 1. The second biasing portion, the time relative to the first straight line in the second surface of the reflecting mirror and the second straight line in contact with the second surface in the region of opposite claim 1 or 2 The mirror support structure described in 1. The mirror support structure according to claim 3 , wherein the first urging portion and the second urging portion elastically urge the second surface at a position sandwiching the first straight line on the second surface. The second biasing part, according to claim 1 or 2 in contact with the second surface in the region of the second straight side when referenced to the first straight line in the second surface of the reflecting mirror Mirror support structure. The mirror support structure according to any one of claims 1 to 5 ,
The optical scanning device used for reflection of the laser beam by which the said reflective mirror supported by the said mirror support structure is radiate | emitted from a light source, and is scanned by the optical scanning part. An optical scanning device according to claim 6 ;
An image forming unit including an image carrier on which an electrostatic latent image is formed by light emitted from the optical scanning device;
An image forming apparatus comprising:

Images