JPH10206617A - Light reflecting mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of vibration by natural vibration of a light reflecting mirror without deteriorating reflecting surface side flatness by a comparatively simple method by providing a reinforcing material stuck to the mirror reflecting surface side by an adhesive. SOLUTION: Reinforcing plate glass 3 is stuck to a part dislocated from the optical path 2 of the reflecting surface of a mirror 1 by a double coated tape 4, and it is reinforced. Or two plate glass 3 are stuck to upper and lower sides of a part dislocated from the optical path 2 of the reflecting surface of the mirror 1 by the double coated tape 4, and they are reinforced. Since a reinforcing material is arranged, a resonance frequency can be enhanced. A surface excellent in flatness of a float glass pane being a raw material is used as a sticking surface of the plate glass 3 to the mirror 1. therefore, the surfaces excellent in flatness in both the mirror 1 and the plate glass 3 can be adhered to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a copying machine,
The present invention relates to an optical turning mirror used in an image reading device of an image forming apparatus such as a printer and a facsimile, and more particularly, to a countermeasure against vibration of the optical turning mirror.

[0002]

2. Description of the Related Art In an image reading apparatus of an image processing apparatus such as a copying machine, a printer, a facsimile, etc., reflected light from a document is read and optically processed to convert it into an electric signal or an image signal. Also, in the image forming apparatus, an electric signal having image information is optically processed using a laser beam or the like to form an image. In this case, the reflected light from the document and the laser diode (LD) beam are turned back by one or a plurality of light turning mirrors, then condensed by a lens, and condensed on a CCD (Charge Coupled Device) or a photoconductor. It is usually imaged.

For example, in the scanner shown in FIG.
1 is a contact glass, 12 is a group of optical turning mirrors, 1
Reference numeral 3 denotes a lens, 14 denotes a light source, 15 denotes a photosensitive drum, and 16 denotes a glass original placed on the contact 11. Light source 1
Document 16 on contact glass 11 receiving light from 4
Reflected light from the mirrors 12-1 and 12-
The light is reflected by the lens 12, 12-3, condensed by the lens 13, and further reflected by the light turning mirror 12-4 to form an image on the photosensitive drum 15. At this time, the light source 14 and the first light turning mirror 12-1 are moved rightward at a speed V, and the second light turning mirror 12-2 and the third light turning mirror 12-3 are rotated.
Move rightward at a speed V / 2, the optical path length can be kept constant.

Further, as shown in FIG. 5, a photoelectric conversion element 17 such as a CCD is placed at the position of the optical turning mirror 12-4 in FIG. It can be extracted as a signal.

By the way, the individual mirrors constituting the optical turning mirror group used in such a scanner device or the like usually have a configuration as shown in FIG. Although both ends are fixed by fixtures 25, the optical turning mirror 2
1 itself is lightweight and movable, so that the mirror causes lateral natural vibration due to the vibration of the movable portion of the image reading device or the image forming device, and as a result, the image has an adverse effect such as shaking or defocus. Could bring.

As one method for avoiding this, as shown in FIG. 7, a reinforcing member 23 such as a metal plate or glass is bonded to the mirror 21 on the side opposite to the reflection surface with a double-sided tape 24 or the like. is there. The purpose of this is to increase the stiffness of the mirror 21, increase its resonance frequency, shift the vibration resonance point, and eliminate the vibration of the mirror 21.

According to this method, the reinforcing member 23 is bonded on the side opposite to the side used as the reflecting surface of the mirror 21. Normally, the float glass plate used as the mirror material has a better flatness on one side than the other, and uses the surface with the better flatness as the reflecting surface. When the reinforcing member 23 is adhered to the surface, even if the material has a relatively good flatness, the glass delicately bends along the curved surface on the back side by this adhesion, and as a result, the flatness on the reflecting surface side of the mirror is reduced. There is an inconvenience that the image quality becomes worse and distortion occurs on the image or a change in magnification occurs.

[0008]

As described above, as a method of preventing the vibration of the conventional optical folding mirror, a method of increasing the resonance frequency by attaching a reinforcing member to the back side of the reflecting surface of the mirror has been adopted. However, since the flatness on the back surface side of the reflection surface of the mirror is lower than that on the reflection surface side, there is a problem that the flatness on the reflection surface side is deteriorated by attaching a reinforcing member to the back surface side.

In view of this point, the present invention provides a reinforcing member that can prevent the occurrence of vibration due to the natural vibration of the optical turning mirror and does not deteriorate the flatness on the reflection surface side by a relatively simple method. Another object of the present invention is to provide an optical turning mirror.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to an optical folding device used in an image reading section of an image forming apparatus such as a copying machine, which is used for folding an optical path of light for reading image information. The mirror is characterized in that a reinforcing material is attached to the mirror reflection surface side with an adhesive to improve rigidity.

Here, a glass plate is used as the reinforcing material. The glass plate is characterized in that a surface having excellent flatness is attached to the mirror reflection surface. Further, a transparent material is used for the glass plate and the adhesive.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view of an optical reflecting mirror according to the present invention. FIG.
FIG. 1 is a cross-sectional configuration diagram illustrating a schematic configuration of an optical turning mirror according to an embodiment of the present invention. This configuration will be described with reference to FIG. In FIG. 1, 1 is a mirror, 2 is an optical path of light,
3 is a plate glass, and 4 is a double-sided tape.

In this configuration, the optical path 2 of the reflection surface of the mirror 1 is
The reinforcing glass sheet 3 is applied to the part outside the
To reinforce it. As a surface of the glass sheet 3 to be bonded to the mirror 1, a surface of a float glass plate, which is a material, having excellent flatness is used. As a result, the mirror 1 and the glass sheet 3 are bonded to each other with excellent flatness, so that the problem that the flatness of the mirror 1 is deteriorated can be solved, and the image due to the deterioration of the flatness can be solved. Inconveniences such as fluctuation and magnification error can be eliminated.

The resonance frequency of the mirror 1 is proportional to the rigidity of the mirror 1 and inversely proportional to the square root of the weight of the mirror 1. By attaching the reinforcing material to the mirror 1, the weight of the mirror 1 increases, but the rigidity also increases. As a result, by providing the reinforcing material, the resonance frequency can be increased. When the resonance frequency of the mirror 1 is increased, the natural vibration is not excited as in the related art, and the vibration due to the natural vibration can be prevented. Further, when the resonance frequency becomes higher, the effect of attenuating the vibration increases due to the viscoelasticity of the double-sided tape 4 used as the adhesive.

Further, since the glass sheet 3 is used as a reinforcing material, a mirror having the same flatness as that of the mirror 1 can be easily obtained, and no extra man-hour is required for improving the flatness.

FIG. 2 is a configuration diagram of another embodiment of the optical turning mirror of the present invention. In FIG. 2, 1 is a mirror, 2 is an optical path of light, 3-1 and 3-2 are plate glasses, and 4 is a double-sided tape. In this case, the reinforcing glass sheets 3-1 and 3-2 are attached to the upper and lower portions of the reflecting surface of the mirror 1 deviated from the optical path with the double-sided tape 4 for reinforcement. Since two sheets of plate glass 3-1 and 3-2, which are reinforcing materials, are provided,
The rigidity of the mirror 1 can be further increased, and the portion where the plate glasses 3-1 and 3-2 are attached can be easily deflected from the optical path 2.

Also in this case, the sheet glasses 3-1 and 3-2
Needless to say, the surface to be attached to the mirror 1 is a surface of a float glass plate, which is a material, having excellent flatness. Further, it is possible to further increase the rigidity by forming a rectangular frame with a reinforcing plate glass to border the reflection surface of the mirror 1.

FIG. 3 is a configuration diagram of still another embodiment of the optical turning mirror of the present invention. In FIG. 3, 1 is a mirror, 2 is an optical path of light, 3 is a plate glass, and 4-1 is a transparent double-sided tape. In this case, not only the plate glass 3 but also the double-sided tape 4-1 was made of a transparent material. By doing so, there is no need to worry about avoiding the optical path 2 when attaching the plate glass 3, and a wide range of the plate glass 3 can be attached within a limited plane of the mirror 1.
The rigidity of the mirror 1 can be further increased. Also in this case, the surface of the glass plate 3 to be attached to the mirror 1 is a surface of a float glass plate, which is a material, having excellent flatness.

As described above, in the present invention, the reinforcing material for increasing the rigidity of the mirror 1 is adhered to the reflection surface of the mirror, and a sheet glass is used as the reinforcing material. As a result, the rigidity of the mirror 1 can be increased to prevent vibration, and the flatness of the reflecting surface of the mirror can be prevented from being impaired, so that a great effect can be obtained in practical use.

[0020]

As described above, according to the first aspect of the present invention, there is provided a light folding device for use in an image reading section of an image forming apparatus such as a copying machine, which is used for turning an optical path of light for reading image information. The mirror is characterized in that a reinforcing material is attached to the mirror reflection surface side with an adhesive to improve rigidity. By doing so, the rigidity of the mirror can be increased and the natural vibration frequency can be increased, so that it is possible to prevent the occurrence of vibration due to the natural vibration of the mirror and to compare the case where the reinforcing material is attached to the back surface. As a result, the flatness of the mirror reflecting surface can be maintained far, and problems such as image fluctuation and magnification error due to deterioration of the flatness can be prevented.

Here, a glass plate is used as the reinforcing material. By using the plate glass as the reinforcing material in this manner, flatness equivalent to the reflection surface of the mirror can be easily obtained, and no special man-hour is required to improve the flatness.

The glass plate is characterized in that the surface having the excellent flatness is attached to the mirror reflection surface. In this manner, by attaching the glass plate to the side having excellent flatness and the mirror to the reflecting surface having excellent flatness, the flatness of the mirror reflecting surface can be maintained, and the image quality due to the deterioration of the flatness can be reduced. Inconveniences such as shaking and magnification error can be prevented.

Further, the glass plate and the adhesive are characterized by using transparent ones. In this way, when using a transparent material as well as a sheet glass, there is no need to worry about avoiding the optical path when attaching the sheet glass. Since the mirror can be attached, the rigidity of the mirror can be further increased, and the natural vibration frequency can be increased, so that the occurrence of vibration due to the natural vibration of the mirror can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of an optical turning mirror of the present invention.

FIG. 2 is a schematic configuration diagram of another embodiment of the optical turning mirror of the present invention.

FIG. 3 is a schematic configuration diagram of still another embodiment of the optical turning mirror of the present invention.

FIG. 4 is a configuration diagram of a scanner device in which the present invention is used.

FIG. 5 is another configuration diagram of the scanner device in which the present invention is used.

FIG. 6 is an external view of a conventional light turning mirror.

FIG. 7 is a configuration diagram of a conventional reinforced optical turning mirror.

[Explanation of symbols]

 Reference Signs List 1 mirror 2 optical path 3, 3-1 and 3-2 sheet glass 4 double-sided tape 4-1 transparent double-sided tape 11 contact glass 12 optical folding mirror group 13 lens 14 light source 15 photosensitive drum 16 document 17 photoelectric conversion element 21 mirror 22 optical path 23 Reinforcing member 24 Double-sided tape 25 Fixture

Claims (4)

[Claims] 1. An optical folding mirror used in an image reading section of an image forming apparatus such as a copying machine and used to fold an optical path of image information reading light, wherein a reinforcing member is attached to a mirror reflecting surface side with an adhesive. An optical turning mirror characterized by comprising a material. 2. The optical folding mirror according to claim 1, wherein the reinforcing member is a glass plate. 3. The optical folding mirror according to claim 2, wherein a surface of the glass plate on a side having excellent flatness is attached to the mirror reflecting surface. 4. The optical folding mirror according to claim 2, wherein transparent materials are used for the glass plate and the adhesive.