JP2005227575A - Mirror fixing structure and image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To fix and hold a reinforcing material and a mirror on a mirror supporting part without an adhesive means to let them contribute to environmental problems considering recycling and reuse, and also to prevent an image from deteriorating by preventing positional shift of the reinforcing material. <P>SOLUTION: This mirror fixing structure is provided with pressing members 2 which have a V-shaped or U-shaped bent cross section for fixing the mirror 3 to mirror fixing parts located at both ends of the mirror 3 and generate elastic force for pressing down the mirror 3, and supporting parts 5a to 5d for supporting the pressing members 2, and a 1st bent part 2d and a 2nd bent part 2e for press-fixing the mirror 3 and the reinforcing material 4 arranged in contact with the back of the mirror 3 by the pressing members 2. Between the 1st bent part 2d and the 2nd bent part 2e, a stepped part 2k is arranged which abuts on at least a part of the end face of the reinforcing member 4 in the longitudinal direction of the mirror on the surface facing the reinforcing member 4 of the pressing member 2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a mirror fixing structure provided with a reinforcing plate, and an image forming apparatus that scans an original with a plurality of mirrors to perform image reading and image formation.

  Conventionally, as an image forming apparatus provided with a folding mirror, an invention disclosed in Japanese Patent Laid-Open No. 11-352602 is known. In this image forming apparatus, as shown in FIG. 6, the document set on the platen 101 is exposed and scanned by the first mirror table 102 and the second mirror table 103. The image information is folded back by the first mirror 104, the second mirror 105, the third mirror 106, and the fourth mirror 107 and imaged on the photoelectric conversion element 108. Based on the information, the laser beam scanner 111 irradiates a laser beam, and forms a latent image on the photosensitive drum 112 via the folding mirrors 109 and 110.

  As shown in FIGS. 7 and 8, the image forming apparatus disclosed in Japanese Patent Laid-Open No. 11-352602 includes a fourth mirror 107, mirror stoppers 113 positioned at both ends of the fourth mirror 107, and the fourth mirror 107. A mirror holding member 114 which has an V-shaped or U-shaped cross section for fixing to the positioning portion, and generates an elastic force for pressing the mirror by changing the angle of the V-shaped or U-shaped cross section; The present invention relates to an image forming apparatus including support portions 115 and 115 that support a member 114. Then, a projection 116 is formed on the portion of the support 115 that supports the mirror pressing member 114, and the projection 117 that is the mirror pressing portion and the longitudinal end surface of the fourth mirror 107 are pressed at one end of the mirror pressing member 114. A stopper portion 113 is formed, and an engagement hole 118 that engages with the protrusion 116 of the support portion 115 at the other end of the mirror pressing member 114 and a V-shaped or U-shaped bent portion 119 with the end as a fulcrum are mirrors. The rotation stop part 120 which restrict | limits the rotation to the direction approaching a direction is formed.

  Therefore, according to the present invention, the mirror 107 is moved to the normal position by the stopper portion 113 of the mirror pressing member 114 even when the fourth mirror 107 is set in a state shifted in the longitudinal direction at the time of assembly or the like. Is positioned. Further, since the mirror holding member 114 after assembly does not rotate in the direction in which the bent portion 119 approaches the fourth mirror 107 due to the action of the rotation stopping portion 120, the portions other than the projection 117 contact the fourth mirror 107. The pressurization failure of the 4th mirror 107 does not occur. Further, even if the fourth mirror 107 tends to shift in the longitudinal direction due to vibration during transportation or operation of the apparatus, the movement of the fourth mirror 107 is limited by the action of the stopper portion 113 of the mirror pressing member 114, Problems such as dropout of the fourth mirror 107, displacement, and vibration due to poor pressurization do not occur.

  However, since the present invention does not have a structure capable of fixing and holding the reinforcing plate, there is a problem that vibration generated by the drive source of the mirror carriage is transmitted to the fourth mirror 107 and causes image degradation.

  Further, an invention described in Japanese Patent Application Laid-Open No. 8-106129 is known as having a reinforcing plate attached to the rear surface of the mirror in order to obtain a vibration damping effect. In the present invention, as shown in FIG. 9, a glass reinforcing plate 222 having a flatness of 100 mR or more is adhered to the surface opposite to the optical path of the mirror 221 with an adhesive or a double-sided tape 223. The effect is that a vibration damping effect can be obtained by simple means without impairing the flatness of the mirror.

  However, if an error in affixing position, cracks, scratches, etc. occur beyond the standard, the mirror and the reinforcing plate must be newly affixed after peeling off the mirror and the reinforcing plate. Actually, since it is difficult to peel off while maintaining the quality before pasting, the mirror and the reinforcing plate must be discarded. Disposal has environmental problems from resource recycling and reuse.

  In Japanese Patent Application Laid-Open No. 2000-75195, as shown in FIG. 10, the reflection mirror holding device includes a holding plate 325 that holds both ends of the mirror 324, a plate spring 326 that presses and fixes the mirror 324, and a holding piece. Since it is assembled with the reinforcing member (wire) 327 stretched between them, it is possible to reliably prevent the spacing between the holding pieces on both sides by the reinforcing member 327, and the reinforcing member 327 is also a lightweight wire or plate. The shape member can be used.

  However, there is no detailed description of the leaf spring, and although a reinforcing plate spaced from the opposite surface to the mirror optical path is shown, this reinforcing plate is for reinforcing the interval between the mirror holding pieces on both sides, It supports a vibration suppression suppressing member provided between the mirror and the reinforcing plate, and has an auxiliary function to obtain a vibration suppression effect. Therefore, in order to obtain a vibration damping effect, at least two kinds of materials, that is, a reinforcing plate and a vibration suppression member, are required, and separation is required when resources are recycled. Furthermore, since the vibration suppression member is in close contact with a very small part of the mirror back surface, there is a problem that when the mirror is thinned, the mirror may be bent or the thermal expansion may be uneven.

  Conventionally, as an invention disclosed in Japanese Patent Application Laid-Open No. 2002-196219, a vibration suppressing effect is achieved by a pressing member that presses the reinforcing member against the back surface of the mirror by an integral elastic bracket supported by brackets on both ends of the mirror. What you get is known.

However, according to the present invention, since the bracket having integral elasticity is used, the mounting workability is inferior, and the reinforcing member may be displaced in the longitudinal direction or the short direction of the mirror.
JP-A-11-352602 JP 2000-75195 A JP-A-8-106129 JP 2002-196219 A

  Therefore, the present invention provides an image forming apparatus in which the reinforcing member and the mirror are fixedly held on the mirror support portion without using an adhesive means, contributes to environmental problems in consideration of recycling and re-use, and the displacement of the reinforcing member is prevented. It is an object of the present invention to provide a mirror fixing structure and an image forming apparatus that can prevent deterioration.

  The invention according to claim 1 has a cross section bent in a V-shape or U-shape for fixing the mirror to mirror positioning portions located at both ends of the mirror, and a presser that generates an elastic force for pressing the mirror. In a mirror fixing structure comprising a member and a support part for supporting the pressing member, a plurality of bendings for pressing and fixing the mirror and the reinforcing member in contact with the back surface of the mirror by the pressing member to the support part A step portion that is in contact with at least a part of the mirror longitudinal end surface of the reinforcing member is provided between the plurality of bent portions on the surface of the pressing member facing the reinforcing member. This is a mirror fixing structure. In this configuration, since the mirror and the reinforcing member can be assembled without using an adhesive or the like, the environmental effects such as replacement, recycling, and reuse are very large. In addition, since the plurality of bent portions are provided in the vicinity of the bent portion of the mirror pressing member, the reinforcing plate does not come off the mirror, and an effect of acting as an adhesive is obtained. Furthermore, since the plurality of bent portions are provided, the mirror and the reinforcing plate can be fixed to the support portion even when the thickness of the reinforcing plate is increased. In addition, since the step portion that abuts at least a part of the mirror longitudinal end surface of the reinforcing member is provided between the plurality of bent portions on the surface facing the reinforcing member of the pressing member, the reinforcing plate deviates from the mirror. The mirror and the reinforcing plate can be fixed without any trouble.

  The invention according to claim 2 has a cross section bent in a V shape or U shape for fixing the mirror to the mirror positioning portions located at both ends of the mirror, and a presser for generating an elastic force for pressing the mirror. In the image forming apparatus including a member and a support portion that supports the pressing member, a plurality of bendings that press and fix the mirror and the reinforcing member in contact with the back surface of the mirror to the support portion by the pressing member. A step portion that is in contact with at least a part of the mirror longitudinal end surface of the reinforcing member is provided between the plurality of bent portions on the surface of the pressing member facing the reinforcing member. An image forming apparatus. In this configuration, since the mirror and the reinforcing member of the image forming apparatus can be assembled without using an adhesive or the like, the environmental effects such as replacement, recycling, and reuse are very large. In addition, since a plurality of bent portions are provided in the vicinity of the bent portion of the mirror pressing member of the image forming apparatus, the effect that the reinforcing plate does not come off the mirror and functions as an adhesive can be obtained. Further, since the plurality of bent portions are provided on the mirror pressing member of the image forming apparatus, the mirror and the reinforcing plate can be fixed to the support portion even when the thickness of the reinforcing plate is increased. In addition, a stepped portion that abuts at least a part of the mirror longitudinal end surface of the reinforcing member is provided between the plurality of bent portions of the pressing member of the image forming apparatus on the surface of the pressing member that faces the reinforcing member. The mirror and the reinforcing plate can be fixed without the reinforcing plate being displaced with respect to the mirror.

  According to a third aspect of the present invention, in the image forming apparatus according to the first aspect, a bent portion is provided in the vicinity of the bent portion of the pressing member so as to be pressed in the short direction of the mirror. In this configuration, since the bent portion that presses in the short direction of the mirror is provided in the vicinity of the bent portion, the displacement of the reinforcing plate can be further prevented.

  According to the present invention, there is no adhesive means such as an adhesive or a double-sided adhesive tape, and the reinforcing material and the mirror are fixedly held on the mirror support portion, contributing to environmental problems in consideration of recycling and reusing, and the reinforcing member It is possible to prevent the image from deteriorating.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 is a side sectional view showing a mirror fixing structure provided in an image forming apparatus according to an embodiment of the present invention, FIG. 2 is a perspective view of a mirror pressing member provided in the image forming apparatus according to an embodiment of the present invention, and FIG. Is a perspective view of a mirror provided in an image forming apparatus according to an embodiment of the present invention, FIG. 4 is a perspective view of a reinforcing member provided in the image forming apparatus according to an embodiment of the present invention, and FIG. FIG. 8 is a perspective view showing the reinforced mirror of FIG. 7.

  As shown in FIG. 1, the image forming apparatus 1 includes support portions 5 a and 5 b that support one end side of the mirror 3 and support portions 5 c and 5 d that support the other end side, and supports the support portions 5 a and 5 b. The portions 5c and 5d exist on the same straight line, and have an integral structure at a portion not shown.

  As shown in FIG. 2, the mirror pressing member 2 is a plate spring having a U-shaped cross section. In this embodiment, the mirror pressing member 2 has a U-shaped cross-sectional shape, but may have a V-shaped cross-sectional shape.

  The mirror pressing member 2 includes a stopper portion 2a on one end side and a rotation stopping portion 2b on the other end side. On the stopper portion 2a side, there are a mirror pressing portion 2c, a first bent portion 2d, and a second bent portion 2e, and the first bent portion 2d and the second bent portion 2e are bent portions 2f. Is bent in two stages so as to approach the leaf spring portion 2g on the rotation stop portion side. In this embodiment, the bent portion is bent in two stages, but may be bent in three or more stages.

  In the vicinity of the bent portion 2f, there are bevel-like bent portions 2h, 2h bent on both sides of the bend portion 2f. Press contact or abut in the short direction. There is an engagement hole 2i in the vicinity of the rotation stopper 2b. The bending angle θ1 of the first bent portion 2d and the bending angle θ2 of the second bent portion 2e can be set when performing a function as a pressing member described later. The mirror pressing member 2 has a bent portion 2f as a fulcrum and is U-shaped or V-shaped when performing a function to be described later, and serves as a spring.

  The reinforcing member 4 is preferably made of a material having the same linear expansion coefficient as the substrate material of the mirror 3. For example, as the material constituting the reinforcing member 4, glass is used when the substrate material of the mirror 3 is glass, and aluminum (or aluminum alloy) glass is used when the substrate material of the mirror 3 is aluminum (or aluminum alloy).

  As shown in FIG. 3, the shape of the mirror 3 is a rectangle. The wide surface in the figure is a reflective surface (surface with a vapor deposition film) 3a that plays the role of an optical path, and its back surface 3b is a surface that does not have the function of a reflective surface, and is a surface that provides reinforcement described later.

  As shown in FIG. 4, the reinforcing member 4 is smaller than the back surface 3 b of the mirror 3, and has the same rectangular shape as the mirror 3 shown in FIG. 3. As shown in FIG. 5, the reinforcing member 4 is placed on the back surface 3 b of the mirror 3. Then, two mirror pressing members 2 are prepared.

  As shown in FIG. 1, the mirror pressing portion 2c of the mirror pressing member is arranged on the same straight line as the support portions 5a and 5b. The mirror pressing portion 2c is arranged on the same straight line as the support portions 5c and 5d.

  Similar to the protrusion 116 of the support 115 of the conventional example shown in FIG. 7, the protrusions (not shown) provided in the support portions 5a and 5b and the engagement holes 2i are fitted together, and the mirror holder is pressed by the rotation stop portion 2b. The member 2 is prevented from rotating.

  As shown in FIG. 1, the top surface 4 a of the reinforcing member 4 is in contact with the vicinity 2 j of the tip of the mirror pressing member 2, and the positioning of the reinforcing member 4 is performed by the tongue-shaped bent portion 2 h that is bent into a tongue shape. Fixing.

  The mirror 3 and the reinforcing member 4 are fixedly held on the support portions 5a to 5d by the mirror pressing member 2. The support portions 5a to 5d are fixed to the frame (not shown) of the image forming apparatus main body by adjusting the angle and position, for example, as in the technique disclosed in Japanese Patent Application Laid-Open No. 11-352602, or Japanese Patent Application Laid-Open No. 11-352602. Similar to the technique disclosed in Japanese Patent Laid-Open No. 2000-75195, Japanese Patent Laid-Open No. 8-106129, or Japanese Patent Laid-Open No. 2002-196219, the angle and position are adjusted and fixed on a moving body (not shown).

  In order to assemble the mirror fixing structure of FIG. 1, first, the mirror 3 and the reinforcing member 4 are held, and the mirror 3 is inserted into the support portions 5a and 5b and the support portions 5c and 5d one by one. Next, one mirror pressing member 2 is deformed into a V-shape or U-shape, passing between the mirror 3 and the support portion 5a, and the other mirror pressing member 2 is deformed into a V-shape or U-shape. Then, the mirror 3 and the support portion 5c are allowed to pass through so that the vicinity 2j of the tip of the mirror pressing member 2 comes into contact with the upper surface 4a of the reinforcing member 4, and the reinforcing member 4 is sandwiched between the tongue-shaped bent portions 2h. Install.

  According to the mirror fixing structure assembled in this way, at least part of one longitudinal end surface of the reinforcing member 4 abuts on the stepped portion 2k of one mirror pressing member 2, and at least one of the other longitudinal end surfaces. Since the portion comes into contact with the stepped portion 2k of the other mirror pressing member 2, the reinforcing member 4 is not displaced in the longitudinal direction. Further, since the reinforcing member 4 is also held in the lateral direction by the tongue-shaped bent portion 2h, the reinforcing member 4 is not displaced in the lateral direction.

  The present invention is not limited to the above embodiment. For example, the bending angle θ1 of the first bent portion 2d and the bending angle θ2 of the second bent portion 2e are substantially the same in this embodiment. However, if the object of the present invention can be achieved, The angles may not be the same. Further, in the present embodiment, the bending angle θ1 of the first bent portion 2d and the bending angle θ2 of the second bent portion 2e are set to be obtuse angles, but both are set to 90 degrees and almost the entire stepped portion 2k is covered. You may make it contact the longitudinal direction end surface of the reinforcement member 4. FIG. Further, the bending angle θ1 of the first bent portion 2d and the bending angle θ2 of the second bent portion 2e may be set at an acute angle. That is, various modifications can be made without departing from the scope of the present invention.

1 is a side sectional view showing a mirror fixing structure provided in an image forming apparatus according to an embodiment of the present invention. 1 is a perspective view of a mirror pressing member provided in an image forming apparatus according to an embodiment of the present invention. 1 is a perspective view of a mirror provided in an image forming apparatus according to an embodiment of the present invention. 1 is a perspective view of a reinforcing member provided in an image forming apparatus according to an embodiment of the present invention. It is a perspective view which shows the mirror of FIG. 3 reinforced with the reinforcement member of FIG. It is sectional drawing which shows the image forming apparatus provided with a folding mirror of the 1st prior art example. It is a perspective view which shows the mirror pressing member with which the image forming apparatus of FIG. 6 is equipped, and the support part of this mirror pressing member. FIG. 7 is a side sectional view showing a fixing structure of a mirror pressing member provided in the image forming apparatus of FIG. 6. It is a mirror side view of the 2nd prior art example. It is a disassembled perspective view which shows the mirror holding device of the 3rd prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 2 Mirror pressing member 2a Stopper part 2b Anti-rotation part 2c Mirror pressing part 2d 1st bending part 2e 2nd bending part 2f Bending part 2g Leaf spring part 2h Velcro bending part 2i Engagement hole 2j Near tip portion 2k Stepped portion 3 Mirror 3a Reflecting surface 3b Back surface 4 Reinforcing member 4a Upper surface 5 Supporting members 5a to 5d Supporting portion

Claims (3)

A pressing member that has a V-shaped or U-shaped bent section for fixing the mirror to the mirror positioning portions positioned at both ends of the mirror and generates an elastic force for pressing the mirror, and supports the pressing member In a mirror fixing structure comprising a support part,
A plurality of bent portions for pressing and fixing the mirror and the reinforcing member disposed in contact with the back surface of the mirror to the support portion by the pressing member;
A mirror fixing structure characterized in that a stepped portion that abuts at least a part of an end surface in the mirror longitudinal direction of the reinforcing member is provided between the plurality of bent portions on a surface of the pressing member facing the reinforcing member. . A pressing member that has a V-shaped or U-shaped bent section for fixing the mirror to the mirror positioning portions positioned at both ends of the mirror and generates an elastic force for pressing the mirror, and supports the pressing member In an image forming apparatus comprising a support unit,
A plurality of bent portions for pressing and fixing the mirror and the reinforcing member disposed in contact with the back surface of the mirror to the support portion by the pressing member;
An image forming apparatus comprising a stepped portion that is in contact with at least a part of a mirror longitudinal end surface of the reinforcing member on a surface of the pressing member facing the reinforcing member between the plurality of bent portions. .   The image forming apparatus according to claim 2, wherein a bent portion that press-contacts in a short direction of the mirror is provided in the vicinity of the bent portion of the pressing member.

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