JPH1152671A - Image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image forming device which can finely electrify the surface of a photosensitive drum and can thereby form an image of good quality. SOLUTION: A copying machine 1 has a photosensitive drum 2. The periphery of the photosensitive drum 2 is provided with an electrifying charger 3 to electrify a drum surface 2a; a developing device 4; a transcribing charger 5; a separating charger 6; a precleaning charger 7; a cleaning blade 8; and a charge removing lamp 9 to remove an electric charge remaining on the drum surface 2a. An angle is given to a wall part where the charger case 3b of the electrified charger 3 is opposite to the charge removing lamp 9, and a black mylar 20 is stuck to this part. The end part 20a of the black mylar 20 is lower than a drum tangent to cross a charge wire 3a and a straight line passing through the center of the drum 2 at right angles, and arranged at a position coming into contact with the optical path of the charge removing light from the charge removing lamp 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying a developer to an electrostatic latent image formed on a photoreceptor drum to visualize the electrostatic latent image, transferring the developer image to a transfer-receiving medium, and outputting an image. The present invention relates to an image forming apparatus.

[0002]

2. Description of the Related Art Conventionally, as an image forming apparatus, a charger for charging the surface of a photosensitive drum (hereinafter simply referred to as a drum surface) to a predetermined potential, and exposing the charged drum surface to form an electrostatic latent image. An exposure device for forming, a developing device for supplying and developing a developer to an electrostatic latent image, a transfer device for transferring a developed developer image to a transfer-receiving medium, and a cleaning device for a developer remaining on a drum surface without being transferred 2. Description of the Related Art There is known a copying machine which includes a cleaning device for removing a residual charge on a drum surface in preparation for a next image forming process, and the discharge lamp in order along a rotation direction of a photosensitive drum.

In recent years, there has been a tendency to reduce the diameter of a photosensitive drum in order to save space. As the diameter of the photoconductor drum is reduced, the distance between the members arranged along the surface of the drum is also reduced. For example, the distance between a static elimination lamp for neutralizing the drum surface and a charger for charging the drum surface to a predetermined potential is also reduced.

When the charge removing lamp and the charging charger are brought close to each other as described above, light leaking from the charge removing lamp is applied to the charged area on the surface of the drum where the charging charger is close to face.
A problem arises in that charge is removed while charging the drum surface, and the charged potential on the drum surface is reduced. In this case, in the normal development, the image density is reduced, and in the reversal development, fogging occurs. In any case, a problem that a high quality image cannot be output occurs.

For this reason, in a conventional copying machine, a black mylar as a light shielding member for shielding leaked light from a portion of the charge removing lamp close to the charging charger or a portion of the charging charger close to the charge removing lamp. Is provided to prevent the above-described problem caused by the leak light.

[0006]

Incidentally, in order to effectively shield the leakage light from the static elimination lamp, it is desirable that the end of the black mylar be as close as possible to the drum surface. In order to obtain a sufficient light-shielding effect, the black mylar is positioned so that the end of the black mylar is located closer to the drum surface than the drum tangent that is orthogonal to the straight line that connects the charge wire of the charger and the center of the photosensitive drum. Need to be installed.

However, when the end of the black mylar is brought close to the drum surface as described above, the black mylar itself is deteriorated due to an environmental change (especially under a high temperature and high humidity environment) or life, or a double-sided tape to which the black mylar is adhered. When the adhesive member is deteriorated, the black mylar undulates and the like, and the end of the black mylar comes into contact with the drum surface, and the photosensitive layer on the drum surface may be damaged. As described above, when the photosensitive layer on the drum surface is damaged, there is a problem that charging failure of the drum surface is caused, and image defects such as black stripes and white stripes are generated in an output image.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide an image forming apparatus which can charge a surface of a photosensitive drum satisfactorily and can form a high quality image.

[0009]

According to a first aspect of the present invention, there is provided an image forming apparatus comprising: a cylindrical image carrier which is rotated in a predetermined direction; and an outer periphery of the image carrier. A charging unit that is arranged to face the surface and applies a charge to the outer peripheral surface to charge the outer peripheral surface to a predetermined potential; and the outer periphery adjacent to the charging unit upstream of the charging unit in the rotation direction of the image carrier. A static eliminator configured to irradiate the outer peripheral surface with light to remove electric charges remaining on the outer peripheral surface, and exposing the outer peripheral surface charged by the charging unit in accordance with an image signal; Forming an electrostatic latent image on the outer peripheral surface,
Image forming means for supplying and developing a charged developer to the electrostatic latent image and transferring the developed developer image onto a transfer-receiving medium to output an image; A portion facing the means is inclined toward the static elimination means, and a light shielding member for shielding light from the static elimination means is provided in this portion.

According to a second aspect of the present invention, there is provided an image forming apparatus comprising: a cylindrical image carrier rotatable in a fixed direction; and an outer peripheral surface of the image carrier. A charging means for applying an electric charge to the charging means to charge it to a predetermined potential; and a charging means arranged upstream of the charging means in the rotational direction of the image carrier, adjacent to the charging means, opposed to the outer peripheral surface, and Irradiating light on the outer peripheral surface to remove electric charges remaining on the outer peripheral surface, and exposing the outer peripheral surface charged by the charging unit in accordance with an image signal to form an electrostatic latent image on the outer peripheral surface. Image forming means for supplying a charged developer to the electrostatic latent image, developing the electrostatic latent image, transferring the developed developer image onto a transfer-receiving medium, and outputting an image. The portion where the means faces the static elimination means is inclined toward the static elimination means. A light-shielding member for shielding light from the static elimination means is provided at this portion, and an end of the light-shielding member opposed to the outer peripheral surface is orthogonal to a straight line passing through the charging means and the center of the image carrier. The inclination angle of the portion of the charging means and the projection amount of the light shielding member are set so as to be arranged at a position closer to the outer peripheral surface than a tangent line on the outer peripheral surface.

According to a third aspect of the present invention, there is provided an image forming apparatus comprising: a cylindrical image carrier rotatable in a fixed direction; and an outer peripheral surface of the image carrier. A charging means for applying an electric charge to the charging means to charge it to a predetermined potential; and a charging means arranged upstream of the charging means in the rotational direction of the image carrier, adjacent to the charging means, opposed to the outer peripheral surface, and Irradiating light on the outer peripheral surface to remove electric charges remaining on the outer peripheral surface, and exposing the outer peripheral surface charged by the charging unit in accordance with an image signal to form an electrostatic latent image on the outer peripheral surface. Image forming means for supplying a charged developer to the electrostatic latent image, developing the electrostatic latent image, transferring the developed developer image onto a transfer-receiving medium, and outputting an image. The portion where the means faces the static elimination means is inclined toward the static elimination means. A light-shielding member for shielding light from the static elimination means is provided at this portion, and an end of the light-shielding member opposed to the outer peripheral surface is orthogonal to a straight line passing through the charging means and the center of the image carrier. The inclination angle of the portion of the charging unit and the protrusion amount of the light shielding member are arranged at a position closer to the outer peripheral surface than a tangent line on the outer peripheral surface and at a position in contact with an optical path of light from the static elimination unit. It is characterized by having been set.

According to a fourth aspect of the present invention, there is provided an image forming apparatus, comprising: a cylindrical photosensitive drum which is rotated in a predetermined direction; Charging means for applying a charge to a predetermined potential, and disposed adjacent to the charging means on the upstream side in the rotation direction of the photoconductor drum from the charging means so as to face the surface, and discharge electricity to the surface; Irradiating the surface charged by the charging means with a light beam corresponding to an image signal, exposing the surface, and irradiating the surface with the charge removing means for removing charges remaining on the surface by irradiation. Image forming means for forming an electrostatic latent image, supplying a charged developer to the electrostatic latent image, developing the latent image, and transferring the developed developer image onto a transfer-receiving medium to output an image; A wall provided with the charging means facing the static elimination means The end facing the surface is inclined toward the static eliminator, and a light-shielding portion for shielding the end portion from being irradiated with static elimination light from the static eliminator to the portion of the surface opposed to the charging unit. A member is provided.

According to a fifth aspect of the present invention, there is provided an image forming apparatus comprising: a cylindrical photosensitive drum which is rotated in a predetermined direction; Charging means for applying a charge to a predetermined potential, and disposed adjacent to the charging means on the upstream side in the rotation direction of the photoconductor drum from the charging means so as to face the surface, and discharge electricity to the surface; Irradiating the surface charged by the charging means with a light beam corresponding to an image signal, exposing the surface, and irradiating the surface with the charge removing means for removing charges remaining on the surface by irradiation. Image forming means for forming an electrostatic latent image, supplying a charged developer to the electrostatic latent image, developing the latent image, and transferring the developed developer image onto a transfer-receiving medium to output an image; A wall provided with the charging means facing the static elimination means The end facing the surface is inclined toward the static eliminator, and a light-shielding portion for shielding the end portion from being irradiated with static elimination light from the static eliminator to the portion of the surface opposed to the charging unit. A member is provided such that an end of the light-shielding member facing the surface is located closer to the surface than a tangent line on the surface orthogonal to a straight line passing through the center of the charging unit and the photosensitive drum. The angle of inclination of the wall of the charging means and the amount of protrusion of the light shielding member are set.

According to a sixth aspect of the present invention, there is provided an image forming apparatus, comprising: a cylindrical photosensitive drum which is rotated in a fixed direction; Charging means for applying a charge to a predetermined potential, and disposed adjacent to the charging means on the upstream side in the rotation direction of the photoconductor drum from the charging means so as to face the surface, and discharge electricity to the surface; Irradiating the surface charged by the charging means with a light beam corresponding to an image signal, exposing the surface, and irradiating the surface with the charge removing means for removing charges remaining on the surface by irradiation. Image forming means for forming an electrostatic latent image, supplying a charged developer to the electrostatic latent image, developing the latent image, and transferring the developed developer image onto a transfer-receiving medium to output an image; A wall provided with the charging means facing the static elimination means The end facing the surface is inclined toward the static eliminator, and a light-shielding portion for shielding the end portion from being irradiated with static elimination light from the static eliminator to the portion of the surface opposed to the charging unit. An end portion of the light-shielding member facing the surface is located closer to the surface than a tangent line on the surface orthogonal to a straight line passing through the center of the charging unit and the photosensitive drum, and the charge removing unit. The inclination angle of the wall portion of the charging means and the amount of protrusion of the light shielding member are set so as to be disposed at a position in contact with the optical path of the charge removing light from the light source.

Further, an image forming apparatus according to a seventh aspect of the present invention is arranged such that a cylindrical photosensitive drum rotated in a fixed direction is opposed to the surface of the photosensitive drum, and the photosensitive drum is provided on the photosensitive drum. Charging means for applying a charge to a predetermined potential, and disposed adjacent to the charging means on the upstream side in the rotation direction of the photoconductor drum from the charging means so as to face the surface, and discharge electricity to the surface; Irradiating the surface charged by the charging means with a light beam corresponding to an image signal, exposing the surface, and irradiating the surface with the charge removing means for removing charges remaining on the surface by irradiation. Image forming means for forming an electrostatic latent image, supplying a charged developer to the electrostatic latent image, developing the latent image, and transferring the developed developer image onto a transfer-receiving medium to output an image; The charging means is provided on a shaft of the photosensitive drum. Extend parallel to have been charged wire,
A charger case surrounding the charge wire with the surface of the photoconductor drum, and a cleaning mechanism operably attached through a slit formed in the charger case to clean the charge wire; The charging means inclines an end of the wall of the charger case facing the static eliminator toward the surface of the charger case toward the static elimination means, and the charge erasing light from the static elimination means faces the end to the charging means. A first light-blocking member for blocking light from irradiating a portion of the surface,
A second light-blocking member for preventing static elimination light from the static eliminator from entering through the slit of the charger case is provided in the static eliminator.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows an electrophotographic copying machine 1 as an image forming apparatus of the present invention.
Are schematically shown.

The copying machine 1 comprises a conductive support, a photoconductive layer,
And a photosensitive drum 2 as an image carrier having an insulating layer as a basic configuration. In the present embodiment, the photosensitive drum 2 has a diameter of Φ60 mm.

Around the photosensitive drum 2, a charge is applied to a surface 2a of the photosensitive drum 2 (hereinafter, simply referred to as a drum surface 2a) to uniformly charge the drum surface 2a to a predetermined potential. A charging charger 3 as a means,
An exposure device (not shown) for exposing the drum surface 2a according to an image signal to form an electrostatic latent image on the drum surface 2a, and a toner and a carrier charged to the electrostatic latent image formed on the drum surface 2a Developing device 4 that supplies a two-component developer and visualizes (develops) the electrostatic latent image as a toner image
And the drum surface 2 at a transfer position substantially directly below the photosensitive drum 2.
a transfer charger 5 that is arranged to face the sheet a and transfers a toner image formed on the drum surface 2a onto a recording sheet as a medium to be transferred passed through the transfer position and outputs an image;
A peeling charger 6 for peeling off the recording paper on which the toner image has been transferred from the drum surface 2a; and a neutral charge received from the peeling charger 6 among the positive charges received by the photosensitive drum 2 from the transfer charger 5 in the reversal development without being neutralized. A pre-cleaning charger 7 for neutralizing the positive charges remaining on the drum surface 2a; a cleaning blade 8 for scraping off the toner remaining on the drum surface 2a; And a static elimination lamp 9 as static elimination means for removing the electric charge remaining in the photosensitive drum 2 in the rotation direction of the photosensitive drum 2.

The drum surface 2a running at a predetermined peripheral speed by the rotation of the photosensitive drum 2 is charged to a predetermined potential by the charging charger 3 and is then exposed by an exposure device, and the electrostatic latent image is left on the drum surface 2a. An image is formed. A developer is supplied to the electrostatic latent image via the developing device 4, and the electrostatic latent image is developed to form a toner image. The toner image on the drum surface 2a thus developed is conveyed to a transfer position by rotation of the photosensitive drum 2, where it is transferred onto the recording paper P by the transfer charger 5. At this time, the recording paper is once aligned by the aligning roller 12 through the aligning switch 11, and is sent to the transfer position in time with the toner image on the drum surface 2a. The recording paper onto which the toner image has been transferred in this manner is peeled off from the drum surface 2a by the peeling charger 6, and the transport belt 1 disposed downstream of the transfer position is provided.
3 and is conveyed to a fixing device (not shown).

On the other hand, the drum surface 2a that has passed the transfer position
The upper residual charge is neutralized by the pre-cleaning charger 7. Further, the residual toner remaining on the drum surface 2a is scraped off by the cleaning blade 8. Further, in preparation for the next image forming process, the drum surface 2a is irradiated with static elimination light via the static elimination lamp 9, and the charge remaining on the drum surface 2a is removed.

Here, the charging charger 3 and the discharging lamp 9 will be described in more detail. Charger 3
Is a charge wire 3a extending substantially parallel to the rotation axis of the photosensitive drum 2 at a position separated from the drum surface 2a by a predetermined distance, and a charger made of a conductive member surrounding the charge wire 3a with the drum surface 2a. A case 3b, a grid 3c provided between the charge wire 3a and the drum surface 2a, and a cleaning mechanism 3d for cleaning the charge wire 3a are provided.

The cleaning mechanism 3d has a cleaning pad (not shown) provided so as to sandwich the charge wire 3a. The cleaning pad is attached to a support member (not shown) slidably provided in a slit 3e formed on the upper portion of the charger case 3b. Thus, by sliding the support member along the slit 3e, the cleaning pad is slid while holding the charge wire 3a, and the charge wire 3a is cleaned.

On the wall of the charger case 3b on the side where the charging charger 3 faces the discharging lamp 9, the discharging light applied from the discharging lamp 9 to the drum surface 2a is applied to the surface of the drum facing the charging charger 3. A black mylar 20 (light-shielding member, first light-shielding member) for shielding light from irradiating the charged area 2a is attached. Black Myra 2
Reference numeral 0 denotes a film formed from an insulating member having black “strain” and is adhered to the wall of the charger case 3b by an adhesive member such as a double-sided tape. The wall of the charger case 3b to which the black mylar 20 is attached is angled so as to be inclined toward the static elimination lamp 9.

The discharging lamp 9 includes a lamp body 9a for irradiating the drum surface 2a with a discharging light, and a lamp body 9a.
a is surrounded by a roof 9b. The static elimination light from the static elimination lamp 9 has an optical path of a predetermined width. In the present embodiment, in order to prevent static elimination light from entering through the slit 3e formed in the upper part of the charger case 3b, the roof 9b on the side where the static elimination lamp 9 faces the charging charger 3 is directed toward the photosensitive drum 2. Has been extended to. still,
The extended portion of the roof 9b functions as a second light shielding member of the present invention.

Here, as a comparative example of the present invention, a first example in which the black mylar 20 is mounted on the charger case 3b of the charging charger 3 (see FIG. 2), and a black mylar 20 is mounted on the lamp body 9a of the static elimination lamp 9 Example 2 (see FIG. 3)
Is shown. In the first example, the black mylar 20 was attached to the wall of the charger case 3b without making an angle to the charger case 3b.

In order to achieve a sufficient light shielding effect by the black mylar 20, a tangent line between the charge wire 3a of the charger 3 and the straight line (plane) passing through the rotation axis of the photosensitive drum 2 is perpendicular to the tangential line. It is necessary to arrange the end 20a of the black mylar 20 at a position closer to the drum surface 2a (hereinafter simply referred to as a drum tangent line).

When the black mylar 20 is mounted in each comparative example so as to satisfy this condition, the gap between the end 20a of the black mylar 20 and the drum surface 2a is 1 mm in the first example.
In the second example, the gap between the end 20a of the black mylar 20 and the drum surface 2a was 2 mm or less.
In any case, the gap between the end 20a of the black mylar 20 and the drum surface 2a is determined only by the amount of protrusion of the black mylar 20, that is, the length of attachment of the black mylar 20, so that the gap tolerance is secured. Difficult to do.

Therefore, when the black mylar 20 is attached as in each of the above-described comparative examples, if the black mylar 20 itself or the adhesive member to which the black mylar 20 is attached are deteriorated due to environmental changes or life, the black mylar 20 is wavy. For example,
In some cases, the end 20a of the black mylar 20 contacts the drum surface 2a. Thus, the end 20a of the black mylar
When the photoconductor comes into contact with the drum surface 2a, the photosensitive layer on the drum surface 2a is damaged, causing charging failure, and resulting in an image defect such as a black stripe or a white stripe in an output image.

Therefore, in the present invention, as described above,
The wall portion of the charger case 3b of the charger 3 facing the static elimination lamp 9 was angled, and a black mylar 20 was stuck to this portion. Thereby, the gap between the black mylar end portion 20a and the drum surface 2a can be adjusted by changing at least one of the angle of the charger case and the protrusion amount of the black mylar 20, and the gap tolerance can be easily secured. The contact between the black mylar 20 and the drum surface 2a can be prevented.

In the present invention, the charger case 3b
Lamp 9 through a slit 3e formed in the upper part of
The roof 9b of the static elimination lamp 9 extends downward to prevent the static elimination light from entering.

Referring now to FIG. 4, the optimum arrangement of the end portion 20a of the black mylar 20 in the present invention will be considered. The distance between the drum surface 2a and the drum tangent L2 orthogonal to the straight line L1 passing through the central axis of the photosensitive drum 2 and the charge wire 3a of the charging charger 3 increases as the distance from the tangent L2 to the drum surface 2a increases. Become. In order to obtain a sufficient light-shielding effect, it is necessary to use a black mylar 2
0 of the drum tangent line L2 to the drum surface 2a.
Must be placed between Therefore, by disposing the end 20a of the black mylar 20 as far as possible from the static elimination lamp 9, the end 20a of the black mylar 20 and the drum surface 2a
It is possible to easily secure a gap tolerance between them.

However, if the end 20a of the black mylar 20 is disposed on the optical path of the neutralizing light emitted from the neutralizing lamp 9 onto the drum surface 2a, the neutralizing effect of the neutralizing lamp 9 is reduced.

For this reason, the optimal arrangement position of the end portion 20a of the black mylar which can easily secure the gap tolerance without hindering the static elimination effect by the static elimination lamp 9 is between the drum tangent L2 and the drum surface 2a. It can be said that it is on the straight line L3 which is in contact with the optical path of the charge removing light from the charge removing lamp 9.

Therefore, in the present invention, the inclination angle of the charger case and the amount of projection of the black mylar 20 are adjusted so that the end 20a of the black mylar 20 comes to this position. Thereby, in the present embodiment, the gap tolerance is set to 1.58.
± 0.24 mm could be secured.

At this time, the projecting amount of the black mylar end 20a from the end of the charger case is 4.5 mm.
For example, the protrusion amount of the second comparative example shown in FIG.
It is considerably shorter than it is. For this reason, in this embodiment, the black mylar 20 due to environmental changes and life
Can be reduced, and the possibility of contact of the black mylar end 20a with the drum surface 2a can be extremely reduced. As a result, defective charging of the drum surface 2a due to damage of the photosensitive layer due to contact with the black mylar 20 can be prevented, and image defects such as black stripes and white stripes can be prevented from being generated in an output image, and a high quality image can be prevented. Can be output.

The optimum bend angle of the charger case which can achieve the above-mentioned effects of the present invention, and the black mylar 20
Is set as follows. First, as shown in FIG. 4, the wall of the charger case 3b facing the static elimination lamp 9 is used as a guide of the bending position as a guide of the drum surface 2 of the case.
1.5mm, 3.0mm, 6.0m from the end near a
m, 9.0 mm, 12.0 mm. Each bending position is set so that the end portion 20a of the black mylar 20 is located at the above-described optimum position, that is, below the drum tangent line L2 and on the straight line L3 that is in contact with the optical path of the static elimination light emitted from the static elimination lamp 9. The bending of the charger case 3b and the amount of protrusion of the black mylar 20 from the case end at this time were examined. The result is shown in FIG. At this time, the black mylar end 20
When the charging potential of the drum surface 2a when the gap between the drum surface 2a and the drum surface 2a was changed was examined, a good charging effect was obtained when the gap was set to 1 mm to 2 mm as shown in FIG. Was completed. For this reason, in the table of FIG. 5, the bending angle and the protrusion amount when the gap was set to 1 mm and 2 mm were examined.

As a result, a sufficient light-shielding effect can be achieved and the drum surface 2a can be favorably charged, and the optimal bending of the charger case without the end portion 20a of the black mylar 20 coming into contact with the drum surface 2a. The angle and the protrusion amount of the black mylar 20 are respectively 145.5 ° or more and 157.0 ° or less, 4.0 mm or more, and 5.5 mm.
It turned out that:

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. For example, the arrangement positions, mounting angles, dimensions, and the like of the photosensitive drum 2, the charging charger 3, the static elimination lamp 9, and the like.
Or the phases of the charging charger 3 and the discharging lamp 9 are as follows.
Various changes can be made depending on machine conditions, and the present invention is not limited to the present embodiment.

[0039]

As described above, the image forming apparatus according to the present invention has the above-described configuration and operation, so that the surface of the photosensitive drum can be favorably charged.
High quality images can be formed.

[Brief description of the drawings]

FIG. 1 is a sectional view schematically showing a main part of a copying machine as an image forming apparatus according to the present invention.

FIG. 2 is a sectional view showing an example in which a black mylar is attached to a charger case as a comparative example of the copying machine of FIG.

FIG. 3 is a cross-sectional view showing a comparative example of the copying machine shown in FIG.

FIG. 4 is a diagram for explaining an optimal arrangement position of an end of a black mylar.

FIG. 5 is a diagram showing an optimum bending angle and a projection amount of a black mylar with respect to a bending position of a charger case.

FIG. 6 is a graph showing a charging characteristic of a drum surface with respect to a gap between an end of a black mylar and a drum surface.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Copy machine, 2 ... Photoreceptor drum, 2a ... Drum surface, 3 ... Charger, 3a ... Charge wire, 3b ... Charger case, 3c ... Grid, 3d ... Cleaning mechanism, 3e ... Slit, 4 ... Developing device, 5 ... Transfer charger, 6: Peeling charger, 7: Pre-cleaning charger, 8: Cleaning blade, 9: Static elimination lamp, 9a: Lamp body, 9b: Roof, 20: Black mylar, 20a: End.

Claims (7)

[Claims] 1. A cylindrical image carrier that is rotated in a fixed direction, and a charging unit that is disposed to face an outer peripheral surface of the image carrier, and that applies a charge to the outer peripheral surface to charge the image carrier to a predetermined potential. And disposed adjacent to the charging means on the upstream side in the rotation direction of the image carrier from the charging means and opposed to the outer peripheral surface, and remained on the outer peripheral surface by irradiating the outer peripheral surface with light. A charge removing unit that removes electric charges; and a developer charged to the electrostatic latent image by exposing an outer peripheral surface charged by the charging unit in accordance with an image signal to form an electrostatic latent image on the outer peripheral surface. And an image forming unit that outputs an image by transferring the developed developer image onto a transfer-receiving medium, and a portion in which the charging unit faces the static elimination unit. To block the light from the static elimination means. An image forming apparatus characterized in that a light blocking member. 2. A cylindrical image carrier that is rotated in a fixed direction, and a charging unit that is disposed to face an outer peripheral surface of the image carrier, and that applies a charge to the outer peripheral surface to charge the image carrier to a predetermined potential. And disposed adjacent to the charging means on the upstream side in the rotation direction of the image carrier from the charging means and opposed to the outer peripheral surface, and remained on the outer peripheral surface by irradiating the outer peripheral surface with light. A charge removing unit that removes electric charges; and a developer charged to the electrostatic latent image by exposing an outer peripheral surface charged by the charging unit in accordance with an image signal to form an electrostatic latent image on the outer peripheral surface. And an image forming unit that outputs an image by transferring the developed developer image onto a transfer-receiving medium, and a portion in which the charging unit faces the static elimination unit. To block the light from the static elimination means. A light-shielding member is provided, and an end of the light-shielding member facing the outer peripheral surface is closer to the outer peripheral surface than a tangent line on the outer peripheral surface orthogonal to a straight line passing through the center of the charging means and the image carrier. An image forming apparatus, wherein an inclination angle of a portion of the charging unit and an amount of protrusion of the light shielding member are set so as to be arranged. 3. A cylindrical image carrier that is rotated in a fixed direction, and a charging unit that is arranged to face an outer peripheral surface of the image carrier, and applies a charge to the outer peripheral surface to charge the image carrier to a predetermined potential. And disposed adjacent to the charging means on the upstream side in the rotation direction of the image carrier from the charging means and opposed to the outer peripheral surface, and remained on the outer peripheral surface by irradiating the outer peripheral surface with light. A charge removing unit that removes electric charges; and a developer charged to the electrostatic latent image by exposing an outer peripheral surface charged by the charging unit in accordance with an image signal to form an electrostatic latent image on the outer peripheral surface. And an image forming unit that outputs an image by transferring the developed developer image onto a transfer-receiving medium, and a portion in which the charging unit faces the static elimination unit. To block the light from the static elimination means. An end portion of the light-shielding member facing the outer peripheral surface is located closer to the outer peripheral surface than a tangent line on the outer peripheral surface orthogonal to a straight line passing through the center of the charging means and the image carrier. And an inclination angle of a portion of the charging means and an amount of protrusion of the light shielding member are set so as to be disposed at a position in contact with an optical path of light from the charge removing means. 4. A cylindrical photoreceptor drum rotated in a fixed direction, charging means disposed opposite to a surface of the photoreceptor drum, and applying a charge on the surface to charge the photoreceptor to a predetermined potential; The charging unit is disposed adjacent to the charging unit on the upstream side in the rotation direction of the photoconductor drum and opposed to the surface, and
A static eliminator for irradiating the surface with static elimination light to remove electric charges remaining on the surface; and irradiating the surface charged by the charger with a light beam corresponding to an image signal to expose the surface. Then, an electrostatic latent image is formed on the surface, a charged developer is supplied to the electrostatic latent image for development, and an image is output by transferring the developed developer image onto a transfer-receiving medium. An image forming unit, wherein the charging unit inclines an end of the wall facing the static elimination unit toward the surface toward the static elimination unit, and the static elimination light from the static elimination unit receives the end at the end. An image forming apparatus, comprising: a light-shielding member for shielding light from irradiating a portion of a surface facing the charging unit. 5. A cylindrical photoreceptor drum rotated in a fixed direction, a charging unit disposed opposite to a surface of the photoreceptor drum, and applying a charge to the surface to charge the photoreceptor to a predetermined potential; The charging unit is disposed adjacent to the charging unit on the upstream side in the rotation direction of the photoconductor drum and opposed to the surface, and
A static eliminator for irradiating the surface with static elimination light to remove electric charges remaining on the surface; and irradiating the surface charged by the charger with a light beam corresponding to an image signal to expose the surface. Then, an electrostatic latent image is formed on the surface, a charged developer is supplied to the electrostatic latent image for development, and an image is output by transferring the developed developer image onto a transfer-receiving medium. An image forming unit, wherein the charging unit inclines an end of the wall facing the static elimination unit toward the surface toward the static elimination unit, and the static elimination light from the static elimination unit receives the end at the end. A light-blocking member is provided for blocking light from irradiating a portion of the surface facing the charging unit, and an end of the light-blocking member facing the surface is a straight line passing through the center of the charging unit and the photosensitive drum. Closer to the surface than the tangent on the surface perpendicular to To be disposed, the image forming apparatus characterized by setting the projecting amount of the inclination angle and the light shielding member of the wall of the charging means. 6. A photosensitive drum having a cylindrical shape rotated in a fixed direction, charging means disposed opposite to a surface of the photosensitive drum, and applying a charge to the surface to charge the photosensitive drum to a predetermined potential; The charging unit is disposed adjacent to the charging unit on the upstream side in the rotation direction of the photoconductor drum and opposed to the surface, and
A static eliminator for irradiating the surface with static elimination light to remove electric charges remaining on the surface; and irradiating the surface charged by the charger with a light beam corresponding to an image signal to expose the surface. Then, an electrostatic latent image is formed on the surface, a charged developer is supplied to the electrostatic latent image for development, and an image is output by transferring the developed developer image onto a transfer-receiving medium. An image forming unit, wherein the charging unit inclines an end of the wall facing the static elimination unit toward the surface toward the static elimination unit, and the static elimination light from the static elimination unit receives the end at the end. A light-blocking member is provided for blocking light from irradiating a portion of the surface facing the charging unit, and an end of the light-blocking member facing the surface is a straight line passing through the center of the charging unit and the photosensitive drum. Closer to the surface than the tangent on the surface perpendicular to In, and so as to be disposed at a position in contact with the optical path of the charge elimination light from the discharging means, the image forming apparatus characterized by setting the projecting amount of the inclination angle and the light shielding member of the wall of the charging means. 7. A cylindrical photoreceptor drum rotated in a fixed direction, charging means disposed opposite to the surface of the photoreceptor drum, and applying a charge to the surface to charge the photoreceptor drum to a predetermined potential; The charging unit is disposed adjacent to the charging unit on the upstream side in the rotation direction of the photoconductor drum and opposed to the surface, and
A static eliminator for irradiating the surface with static elimination light to remove electric charges remaining on the surface; and irradiating the surface charged by the charger with a light beam corresponding to an image signal to expose the surface. Then, an electrostatic latent image is formed on the surface, a charged developer is supplied to the electrostatic latent image for development, and an image is output by transferring the developed developer image onto a transfer-receiving medium. An image forming unit, wherein the charging unit is a charge wire extending substantially parallel to an axis of the photoconductor drum, a charger case surrounding the charge wire with a surface of the photoconductor drum, and The charger case operably attached through a slit formed in the charger case, having a cleaning mechanism for cleaning the charge wire, wherein the charging unit is opposed to the charge removing unit. The end of the wall portion facing the surface is inclined toward the static elimination means, and the end of the wall is shielded from being irradiated with static elimination light from the static elimination means to a portion of the surface facing the charging means. Wherein the first light-shielding member is provided, and a second light-shielding member is provided in the charge eliminating means for preventing static elimination light from the charge eliminating means from entering through the slit of the charger case. Forming equipment.