JPH09321925A - Noise shielding method for image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a noise shield method for the image forming device in which grounding performance and vibration proof performance are improved and undesired radiation noise from the harness is shielded in the image forming device of scanner printer open/close type. SOLUTION: This device has a scanner section 1, a printer section 2 and an image processing section, the image processing section is placed on a ceiling of the printer section 2, and the scanner section 1 and the printer section 2 are open and closed through a hinge structure. A wire harness 47 interconnecting the scanner section 1, the printer section 2 and the image processing section is fixed to a recessed part of a recessed conductive elastic member 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise shielding method in an image forming apparatus using an electrophotographic system such as a copying machine, a printer and a facsimile.

[0002]

2. Description of the Related Art Conventionally used image forming apparatuses such as a digital copying machine having a structure in which a scanner section and a printer section are separable can be roughly classified into the following two types. One is the scanner / printer complete separation type, in which the scanner section and the printer section are completely separated, and each unit constitutes a unit, which is electrically connected by a power cable or signal cable. It is what In addition, at the time of installation, the scanner unit is placed on the upper portion of the printer unit, and it is not fixed with screws or the like. The other is a scanner / printer opening / closing type, which has a hinge structure or a sliding structure, although the scanner part and the printer part are separated so that they can be opened / closed, and the structure requires expandability and maintainability. In general, they are fixed with screws or the like to form an integral structure.

As described in Japanese Patent Laid-Open No. 4-296152, in the case of the scanner / printer complete separation type, a plurality of conductive members are provided around the top plate of the printer unit in the gap between the scanner unit and the printer unit. Is placed so as to surround the entire circumference, and a concave part to which a part of the conductive member is fitted is provided on the bottom plate of the scanner part to shield unnecessary copy noise, to prevent vibration and to suppress vibration, and to block heat. It is known. Since the conductive member uses a metal leaf spring with spring properties, it is not configured to completely close the gap, and in the case of the scanner / printer complete separation type, it is not securely fixed. The groundability is not perfect. Further, in Japanese Patent Laid-Open No. 4-296152, only the scanner / printer complete separation type is mentioned, and the scanner / printer opening / closing type is not mentioned.

Also, in the case of the scanner / printer open / close type, as in the case of the scanner / printer complete separation type, a conductive member is provided to shield unnecessary copying noise.

The route in which unnecessary copy noise actually occurs is
Unnecessary radiant noise from the wire harness connected to the board is mostly, not the board itself processing various image data. Further, since the wire harness is laid around mixedly with the power supply line and the signal line, they interfere with each other and radiate unnecessary radiation noise to the outside of the device.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above problems and, in the case of a scanner / printer opening / closing type,
An object of the present invention is to provide a noise shielding method for an image forming apparatus capable of improving the grounding property and the vibration damping property and shielding unnecessary radiation noise from the harness.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 exposes a document, reads the reflected light with an optical reading sensor such as CCD, and converts it into a predetermined signal level. A scanner unit including an image reading unit that performs appropriate processing on the signal level for image processing, an electrostatic latent image is formed, development is performed to visualize the electrostatic latent image, and the obtained visible image is displayed. Image data is created based on the image data from the scanner unit and the printer unit that includes an optical writing unit such as a laser that obtains a transfer image by the fixing unit, and a series of image forming mechanism and transfer sheet conveying mechanism. It has an image processing unit that performs appropriate processing and converts it into optical writing data, the scanner unit and the printer unit can be separated, the image processing unit is located on the top plate of the printer unit, and The scanner and printer sections are In the image forming apparatus having an opening and closing can be constructed in a structure, a wire harness for connecting the scanner unit, an image processing unit, the printer unit is characterized by fixing the conductive elastic member as a guide member.

In order to solve the above-mentioned problems, a second aspect of the invention is the invention of the first aspect, in which the conductive elastic member has a concave shape and is fixed on the top plate of the printer section to fix the wire harness. It is characterized in that it is arranged in the recess of the conductive elastic member, and that the upper part of the wire harness is covered by the scanner section bottom plate.

In order to solve the above-mentioned problems, the invention according to claim 3 is the invention according to claim 1, in which a mesh-shaped shield tape is wound around the outer periphery of the wire harness and is arranged in the recess of the conductive elastic member. Characterize.

In order to solve the above-mentioned problems, the invention according to claim 4 is characterized in that, in the invention according to claim 1, the recessed sectional area of the conductive elastic member is smaller than the sectional area of the wire harness.

In order to solve the above-mentioned problems, the invention according to claim 5 is characterized in that, in the invention according to claim 1, the inside of the conductive elastic member is an elastic member and the outer cover is a conductive fiber member. To do.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION A noise blocking method for an image forming apparatus according to the present invention will be described below with reference to the drawings. 1, in a color image reading apparatus (hereinafter referred to as a color scanner) 1, illumination light emitted from an illumination lamp 4 is reflected on the surface of a document 3 and the reflected light is the first light.
The mirror 5-1, the second mirror 5-2, and the third mirror 5-3 are reflected in this order, and an image is formed on the color sensor 7 via the lens 6, and the color original image of the original 3 is, for example, Blue.
(Hereinafter referred to as B), Green (hereinafter referred to as G), Re
Each color separation light of d (hereinafter referred to as R) is read and converted into an electric image signal.

In the embodiment of the present invention, the color sensor 7 is composed of B, G, and R color separation means and a photoelectric conversion element such as a CCD, and simultaneously reads three colors. Then, based on the B, G, and R color-separated image signal intensity levels read by the color scanner 1, color conversion processing is performed by an image processing unit (not shown), and Black (hereinafter referred to as BK), Cyan (hereinafter referred to as C ,), Magenta (hereinafter referred to as M), and Yel-low (hereinafter referred to as Y) color image data. A color image recording device (hereinafter referred to as a color printer) 2 which displays the color image data as follows:
Then, BK, C, M, and Y are visualized, and these are superposed to form a four-color color image.

Next, an outline of the color printer 2 will be described. In the writing optical unit 8, the color scanner 1
The color image data from is converted into an optical signal, the optical writing corresponding to the original image is performed, and the electrostatic latent image is formed on the photosensitive drum 9. The writing optical unit 8 is a laser 8-
1, a light emission drive control unit (not shown), and a polygon mirror 8-2
And a rotation motor 8-3, an f / θ lens 8-4, a reflection mirror 8-5, and the like. The light from the laser 8-1 is guided to the polygon mirror 8-2 that rotates at high speed, and is converted into a light beam that reciprocates on the photosensitive drum 9. Laser light is turned on and off by a computer.
The image is exposed on the photosensitive drum 9 under FF control.

The photosensitive drum 9 rotates counterclockwise as indicated by the arrow. Around the photoconductor 9, a photoconductor cleaning unit 10 including a pre-cleaning static eliminator, a static elimination lamp 11, a charging body 12, a potential sensor 13, and a BK developing device 1
4, a C developing device 15, an M developing device 16, a Y developing device 17, a development density pattern detector 18, an intermediate transfer belt 19 and the like are arranged. First, the outer peripheral surface of the photosensitive drum 9 is uniformly charged by the charging body 12. Next, based on the image information obtained by scanning the image of the original 3 with the color scanner 1 on the outer peripheral surface of the uniformly charged photosensitive drum 9, while controlling the ON / OFF of the laser 8-1. The photosensitive drum 9 is exposed to light to form an electrostatic latent image corresponding to the image of the original 3. Next, the electrostatic charge on the peripheral portion of the outer peripheral surface of the photoconductor drum 9 where the electrostatic latent image is not formed is removed by the static elimination lamp 11. The electrostatic latent image on the outer peripheral surface of the photosensitive drum 9 is visualized by the toner of each color by the BK developing device 14, the C developing device 15, the M developing device 16, and the Y developing device 17, and the visualized image is formed. The formed image is transferred to the transfer paper with the interposition of the intermediate transfer belt 19. After the transfer, the toner remaining on the outer peripheral surface of the photosensitive drum 9 is collected by the cleaning unit 10. The transfer sheet is conveyed into the fixing device 22 by the conveying belt 21, fixed by the fixing roller 23 and the pressure roller 24, and sent to the discharge tray 25 or the bin of the sorter.

Although not shown, each of the developing devices 14 to 17 uses a brush of developer for developing the electrostatic latent image.
And a developing paddle that rotates to draw up and stir the developer, a toner concentration detection sensor for the developer, and the like. In the standby state, the developing agents on all the developing sleeves of the four developing devices 14 to 17 are in the cutting-off state in which the development is inoperative. The color image forming order, which is the order of the developing operation, is B
The case of K, C, M, and Y will be described below as an example. However, the image forming order is not limited to this.

When the copy operation is started, the color scanner 1 starts reading BK image data at a predetermined timing, and writing is performed by laser light based on the image data, and the BK latent image is formed on the photoconductor 9. Image formation begins. (Hereinafter, the electrostatic latent image based on the BK image data is referred to as a BK latent image. The same applies to C, M, and Y). This B
Before the front end of the BK latent image reaches the developing position of the BK developing device 14 so that development can be performed from the front end of the K latent image, a developing sleeve (not shown) is started to rotate so that the developer spikes.
The K latent image is developed with BK toner. Then, the developing operation of the BK latent image area is continued thereafter, but when the trailing edge of the BK latent image passes the BK developing position, the developer on the BK latent image sleeve is quickly cut off to make the developing inoperative state. To This is completed at least before the leading edge of the C latent image by the next C image data arrives. It should be noted that the brush cutting is performed by switching the rotation direction of the developing sleeve to the opposite direction to that during the developing operation.

The BK toner image formed on the photoconductor 9 is transferred onto the surface of the intermediate transfer belt 19 which is driven at the same speed as the photoconductor 9. (Hereinafter, toner image transfer from the photoconductor 9 to the intermediate transfer belt 19 is referred to as belt transfer). The belt transfer is performed by applying a predetermined bias voltage to the transfer bias roller 20 while the photoconductor 9 and the intermediate transfer belt 19 are in contact with each other. On the intermediate transfer belt 19, the BK, C, M, and Y toner images sequentially formed on the photoconductor 9 are sequentially aligned on the same surface to form a four-color overlapping belt transfer image, and then the transfer paper is formed. Perform batch transfer.

On the side of the photoconductor 9, the C process is proceeded to after the BK process, but the C image data reading by the color scanner 1 is started from a predetermined timing, laser light writing is performed by the image data, and C latent image formation is performed. The C developing device 15 starts the rotation of the developing sleeve (not shown) after the rear end of the previous BK latent image has passed to the developing position and before the leading end of the C latent image reaches the developing position to develop the image. The agent is raised and the C latent image is developed with C toner. After that, the development is continued in the C developing area, but when the rear end of the C latent image passes, the spikes of the developer on the developing sleeve are cut, as in the case of the previous BK developing device. This is also completed before the leading edge of the next M latent image passes. Note that the steps of M and Y are the same as the steps of BK and C, respectively, in the operations of reading image data, forming a latent image, and developing, and will not be repeated.

The scanner unit 1 and the printer unit 2 will be described below with reference to FIGS. FIG. 2 shows a state in which the color scanner 1 is opened with a hinge portion (not shown) of the color printer 2 as a fulcrum. FIG. 3 is a perspective view of the upper portion of the color printer 2. On the upper portion of the color printer 2, a conductive elastic member 41 having a concave cross section is connected to a wire harness 47 connected to an image processing printed circuit board 46.
It is arranged to secure the route. The wire harness 47 connected to the image processing printed circuit board 46 is arranged inside the concave portion of the concave conductive elastic member 41.
The cover 48 covers the image processing printed circuit board 46 arranged above the color printer 2 and is arranged so as to be a top plate of the color printer 2. Wire harness 4
By winding a mesh-shaped shield tape around the outer periphery of 7, it is possible to ground it via the conductive elastic member 41, and it is possible to improve workability. The wire harness 47 is for connecting the printer 2 and the printed circuit board 46 in order to operate the printed circuit board 46, and includes a power line harness, a signal line harness,
Includes three types of image data line harness.

During normal use, by keeping the color scanner 1 and the color printer 2 in a closed state, the wire harness 47 has its upper portion covered by the cover 4 of the color scanner 1.
It will be completely shielded at 8. To fix the color scanner 1 and the color printer 2 in the closed state, the scanner unit front side fixing portion 43 and the scanner unit rear side fixing portion 44 are fixed to the front side fixing screw 42 and the rear side fixing screw 4.
It is fixed as a 4-point support by 5.

A cover 48 of the color scanner 1 and a concave conductive elastic member 41 arranged on the upper portion of the color printer 2.
As a result, the wire harness 47 connected to the image processing printed circuit board 46 is reliably shielded, and unnecessary radiation noise can be prevented. In particular, it is effective in preventing high-frequency noise of about 300 (MHz) or more due to radiation from the cable.

In FIG. 4, a bundle of wire harness 47 connected to the image processing printed circuit board 46 is arranged in the concave portion of the concave conductive elastic member 41 arranged in the upper portion of the color printer 2, and the color scanner 1 It is sectional drawing before fixing a bottom plate. The concave conductive elastic member 41 has a conductive fiber member 41-1 as the outer skin and an elastic member 41-2 inside. The top plate of the color printer 2 has a recessed shape for disposing the concave conductive elastic member 41 as shown in the figure. The height of the concave conductive elastic member 41 is a,
The dimension from the bottom portion 2-1 to the top portion 2-2 of the top plate of the color printer 2 is b, and the compression ratio of the concave conductive elastic member 41 is k.
(About 0.6 to 0.8), there is a relation of b = k × a. In addition, the conductive fiber member 41-1 uses a nylon fabric fiber coated with silver, a metal wire mesh such as tin-plated copper, or the like, and the elastic member 41-
2 uses materials such as polyurethane foam and carbon-containing silicon rubber.

FIG. 5 is a sectional view after fixing the bottom plate of the color scanner 1 to the concave conductive elastic member 41 arranged on the upper portion of the color printer 2. In the state shown,
The concave conductive elastic member 41 is in a compressed state at a compression rate k. As shown in FIG. 4, the cross-sectional area of the recess of the conductive elastic member 41 is smaller than the cross-sectional area of the wire harness 47, but the bottom plate of the scanner unit 1 compresses the wire harness 47 as shown in FIG. The elastic member 41 is fixed in the recess.

[0025]

According to the first aspect of the invention, the original is exposed, the reflected light is read by an optical reading sensor such as a CCD, converted into a predetermined signal level, and the signal level is used for image processing. A scanner unit including an image reading unit that performs an appropriate process, an electrostatic latent image is formed, development is performed to visualize the electrostatic latent image, the obtained visible image is transferred to a transfer paper, and then a fixing unit. An optical writing unit such as a laser for obtaining a transfer image by a printer, a printer unit including a series of image forming mechanism and a transfer paper conveying mechanism, and an appropriate processing process for the image data based on the image data from the scanner unit to perform an optical writing. An image processing unit for converting into embedded data, the scanner unit and the printer unit can be separated, the image processing unit is located on the top plate of the printer unit, and the scanner unit and the printer unit have a hinge structure. It has a structure that can be opened and closed with In the image forming apparatus, a scanner unit, an image processing unit, a wire harness for connecting the printer unit, because fixing the conductive elastic member as a guide member,
It is possible to prevent unnecessary copying noise and higher harmonic noise from the wire harness from being shielded by the conductive elastic member, and to reliably fix the wire harness by the elastic force of the conductive elastic member.

According to a second aspect of the invention, in the first aspect of the invention, the conductive elastic member has a concave shape,
The wire harness is fixed on the top plate of the printer part, the wire harness is placed in the concave part of the conductive elastic member, and the upper part of the wire harness is covered with the scanner part bottom plate, so the entire circumference of the wire harness is shielded and unnecessary radiation noise is eliminated. In addition to being able to cut off, the power supply line and the signal line can be separately routed, and mutual influences can be eliminated.

According to the invention of claim 3, in the invention of claim 1, since the mesh-shaped shield tape is wound around the outer periphery of the wire harness and is arranged in the recess of the conductive elastic member, the mesh-shaped shield tape of Ground
This can be performed by the conductive elastic member, and it is possible to reduce the work such as using a grounding member for grounding the wire harness and soldering a ground wire having poor workability to the wire harness side.

According to the invention described in claim 4, in the invention described in claim 1, the recessed sectional area of the conductive elastic member is made smaller than the sectional area of the wire harness, so that the wire harness is securely fixed. No more worrying about getting caught in the scanner when opening and closing it. Further, when a mesh-shaped shield tape is used, it is possible to stabilize the grounding.

According to a fifth aspect of the present invention, in the first aspect of the invention, the conductive elastic member is made of an elastic member inside and the outer cover is made of a conductive fiber member. Since it is not necessary to use a member for the wire harness or solder the ground wire, which has poor workability to the wire harness side, and it is easy to assemble and fix the wire harness on the production line, it is possible to reduce the confirmation process, The weight of the entire device can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an image forming apparatus according to the present invention.

FIG. 2 is a perspective view showing an open state of a scanner unit and a printer unit according to the same embodiment.

FIG. 3 is a perspective view of an upper portion of the printer unit according to the above embodiment.

FIG. 4 is a cross-sectional view showing a state in which the bottom plate of the color scanner is fixed to the concave conductive elastic member arranged on the upper portion of the color printer in the embodiment.

FIG. 5 is a cross-sectional view showing a state in which the bottom plate of the color scanner is fixed to the concave conductive elastic member arranged on the upper portion of the color printer in the same embodiment.

[Explanation of symbols]

 1 Color Scanner 2 Color Printer 7 Color Sensor 8 Writing Optical Unit 41 Conductive Elastic Member 41-1 Conductive Fiber Member 41-2 Elastic Member 47 Wire Harness

Claims (5)

[Claims] 1. A document is exposed to light, and the reflected light is reflected by a CCD.
An optical reading sensor such as an optical reading sensor converts the signal level into a predetermined signal level, and the signal level is appropriately processed for image processing. Includes an optical writing unit such as a laser and a series of image forming mechanism and transfer paper transport mechanism that develops to visualize the image, transfers the obtained visible image to transfer paper, and then obtains the transferred image by the fixing unit It has a printer section and an image processing section that performs appropriate processing on the image data based on the image data from the scanner section and converts it into optical writing data. The scanner section and the printer section can be separated. In an image forming apparatus in which the image processing unit is located on the top plate of the printer unit, and the scanner unit and the printer unit have a hinge structure that can be opened and closed, a wire harness connecting the scanner unit, the image processing unit, and the printer unit is used. Scan, the noise shielding method for an image forming apparatus characterized by fixing the conductive elastic member as a guide member. 2. The invention according to claim 1, wherein the conductive elastic member has a concave shape, is fixed on the top plate of the printer unit, and the wire harness is arranged in the recess of the conductive elastic member. A noise shielding method for an image forming apparatus, characterized in that the upper part of the harness is covered with a scanner bottom plate. 3. The invention according to claim 1, wherein a mesh-shaped shield tape is wound around the outer periphery of the wire harness,
A noise shielding method for an image forming apparatus, wherein the noise shielding method is arranged in a recess of a conductive elastic member. 4. The noise shielding method for an image forming apparatus according to claim 1, wherein the cross-sectional area of the recess of the conductive elastic member is smaller than the cross-sectional area of the wire harness. 5. The noise shielding method for an image forming apparatus according to claim 1, wherein the conductive elastic member has an elastic member inside and a conductive fiber member as an outer cover.