JP2015141376A - Optical discharge device and image forming apparatus including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a light quantity distribution of irradiated light irradiating a photoconductor more uniform even if there is a light guide plate attachment, parts variation, LED divergent light variation, etc. in an electrophotographic image forming apparatus. Provide a light neutralizing device. An optical static elimination device according to the present invention is an optical static elimination device used to neutralize electric charges on a photoconductor in an electrophotographic image forming apparatus, and is a light guide disposed to face the photoconductor. And a light source for irradiating light to the light incident surface of the light guide, and the position of the light guide and / or the light source can be adjusted. [Selection] Figure 6

Description

  The present invention relates to a photostatic discharger that removes residual charges on a photoreceptor by light irradiation in an electrophotographic image forming process, and an image forming apparatus such as a copying machine including the same.

  An electrophotographic image forming apparatus is an apparatus that forms an image by each process of charging, exposure, development, transfer, and fixing. For example, in the case of a copying machine, the above processes are performed as follows.

  First, an electrostatic latent image is formed by exposing reflected light of an original image through an optical system on the surface of a photoconductor (photosensitive drum) given a uniform charge by a charger charger. A toner (developer) is electrostatically attached to the image and developed to form a toner image on the photoreceptor. Next, the toner image is transferred onto the recording paper by applying static electricity having a polarity opposite to that of the toner image to the transfer body, and the transferred toner is fixed by heating and pressurizing, and an image corresponding to the original image is formed on the recording paper. Immobilize.

  Many functional elements are added to the basic configuration of the copying machine configured as described above for the purpose of improving the image quality and the efficiency of forming a copied image. For example, this corresponds to an optical static elimination device that neutralizes the charge on the photosensitive member by light irradiation. Examples of the light neutralizing device include an eraser that erases a defective latent image in a non-image area on a photoconductor before development processing, a pre-transfer neutralization lamp (PTL) that optically lowers the potential on the photoconductor before transfer processing, Examples thereof include a static elimination lamp (QL) that removes residual charges on the photoconductor after the cleaning process.

  A discharge tube such as a fluorescent tube is used as an illumination light source of such a light neutralizing device. As shown in FIG. 10, an LED array 500 in which a large number of LED chips 502 are arranged on a substrate 501 is used. In particular, in recent years, there has been a demand for products that are smaller and less expensive.

  As shown in FIG. 11, the LED array 500 has a high illuminance that is substantially uniform with respect to the surface of the photosensitive drum 1 that is an illuminated surface by closely arranging LED chips (LED lamps) 502. Can be obtained.

  However, in this configuration, since the number of LED chips 502 used is large, it is difficult to achieve a sufficient cost reduction in terms of cost. Further, when the number of LED chips 502 used is reduced in order to achieve cost reduction, the spacing between the LED chips 502 increases, and the illuminance distribution of the photosensitive drum 1 is uneven, thereby obtaining uniform illuminance. I can't.

  As a technique for solving such a problem, a columnar member made of a translucent material, a light irradiation surface provided on a side surface portion along the longitudinal direction, and a cutting process or roughening provided on a surface opposite to the light irradiation surface. There has been disclosed an illumination device that includes a light guide having a light diffusing portion by surface processing and has a light source provided at an end of the light guide (see, for example, Patent Document 1).

  Further, there is disclosed an optical static eliminator including a point light source that is detachably attached to the image forming apparatus main body and a light guide that constitutes an optical path that guides incident light from the point light source to the photosensitive member (for example, , See Patent Document 2).

JP 08-043333 A JP 2002-278395 A

  However, according to the configuration described in each of the above-mentioned patent documents, among the areas where light is irradiated from the light guide to the photosensitive drum, the irradiation light amount is large in the area close to the light source, and the irradiation is performed in the area far from the light source. In some cases, the light static elimination device has a variation in the light amount distribution, such as a small amount of light. This is because, in the case of manufacturing a light static elimination device, the positional relationship between the light guide plate and the light source is uniformly determined based on the design value, and the device is assembled. This is because it does not correspond to the variation of parts.

  As described above, when the distribution of the irradiation light quantity varies in the longitudinal direction of the photosensitive drum, image unevenness or the like occurs and a good image cannot be obtained. In particular, in the vicinity of the terminal portion of the light guide that is farthest from the light source, the degree of decrease in the amount of irradiation light is large, and improvement of this point is required.

  The present invention has been made in view of such circumstances, and in an electrophotographic image forming apparatus, even if there is a light guide plate attachment, component variation, LED divergent light variation, or the like, the photosensitive member is irradiated. An object of the present invention is to provide an optical static elimination device capable of making the light amount distribution of irradiation light more uniform, and to provide an image forming apparatus including the optical static elimination device having such characteristics.

  In order to solve the above-mentioned problems, an optical static elimination device according to the present invention is an optical static elimination device used to neutralize charges on a photoconductor in an electrophotographic image forming apparatus, and is opposed to the photoconductor. And a light source for irradiating light to the light incident surface of the light guide, and the position of the light guide and / or the light source can be adjusted.

  Moreover, the said light static elimination apparatus may be provided with the position adjustment mechanism which enables position adjustment of the said light guide and / or the said light source.

  The position adjustment may be performed by moving the position of the light source with respect to the light guide in at least one of the front-rear direction, the left-right direction, and the up-down direction.

  The position adjustment may be performed by directing the light source with respect to the light guide at least in the left-right direction or the up-down direction.

  The position adjustment may be configured to move the position of the light guide relative to the light source to at least one of the front-rear direction, the left-right direction, and the up-down direction.

  It is good also as a structure provided with the static elimination unit in which the said light guide and the said light source are integrated in the unit.

  An image forming apparatus according to the present invention includes any one of the above-described optical static elimination devices.

  According to the light static eliminator of the present invention, even if the light guide plate is attached, the components are varied, the LED is divergent, or the like, the light distribution of the irradiation light applied to the photosensitive member can be made more uniform. It is possible to realize a static eliminator and an image forming apparatus including an optical static eliminator having such characteristics.

1 is a diagram illustrating a configuration of an embodiment of an image forming apparatus of the present invention. It is a figure which shows the structure of the image forming unit used for the image forming apparatus of FIG. It is a perspective view which shows the principal part structure of embodiment of the optical static elimination apparatus of this invention. It is a figure which writes and shows the side view (A) and top view (B) of the optical static elimination apparatus of FIG. It is a figure which shows the state which mounted | wore the image forming apparatus with the optical static elimination apparatus of FIG. It is a side surface schematic diagram explaining the arrangement | positioning adjustment method of the LED lamp 11 which concerns on Example 1. FIG. It is a side surface schematic diagram explaining the arrangement | positioning adjustment method of the LED lamp 11 which concerns on Example 2. FIG. It is a plane schematic diagram explaining the arrangement | positioning adjustment method of the LED lamp 11 which concerns on Example 3. FIG. FIG. 6 is a schematic diagram of a static elimination unit 300 according to a fourth embodiment. It is a perspective view which shows the structure of the LED array used for the conventional optical static elimination apparatus. It is a side view which shows the structure of the conventional optical static elimination apparatus.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same members are denoted by the same reference numerals. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.

  FIG. 1 is an internal configuration diagram showing a configuration of an image forming apparatus 100 according to the present invention. The image forming apparatus 100 is a digital multi-function peripheral capable of facsimile operation, copy operation, and printer operation, and includes an image reading unit 101, an image forming unit 102, a paper feeding unit 103, and a post-processing device 104. .

  The image reading unit 101 is provided as an image input device of the image forming apparatus 100 for reading an image such as a document. In addition to the document placing table 105 made of transparent glass, the image reading unit 101 is a double-sided automatic document feeder (hereinafter, referred to as a document feeder). (Referred to as RADF) 106 and an optical system unit 110.

  The image reading unit 101 sequentially reads images of the original document one by one from the original document placed on the document placement table 105. The RADF 106 conveys originals set on a predetermined original tray one by one to the original placing table 105, and after the image is read by the optical system unit 110, it is carried out to a predetermined extraction position.

  The optical system unit 110 is configured as a document image reading unit that reads an image of a document conveyed to the document placing table 105 in predetermined units in the scanning line direction. The optical system unit 110 includes a first mirror base 111, a second mirror base 112, an optical lens 117, and a photoelectric conversion element (hereinafter referred to as a CCD) 118.

  The first mirror base 111 includes a lamp reflector assembly 113 for irradiating light, and a first reflection mirror 114 for guiding reflected light from the document to a second mirror base 112 described later, and a document placement table. The original is irradiated with light while moving at a constant speed V from left to right in FIG.

  The second mirror base 112 includes a second reflection mirror 115 and a third reflection mirror 116 that guide light from the first mirror base 111 in the direction of the optical lens 117 and the CCD 118. Following the operation of the base 111, it moves at a speed of V / 2.

  The optical lens 117 focuses the reflected light from the second mirror base 112 on the CCD 118. The CCD 118 converts the light imaged by the optical lens 117 into an electrical signal. The analog electrical signal obtained by the CCD 118 is converted into image data of a digital signal, subjected to various image processing, and then transferred to the image forming unit 102 through a buffer memory or the like as appropriate.

  The image forming unit 102 includes an image forming unit 120 and an exposure unit 121. The exposure unit 121 exposes the photosensitive drum 1 in accordance with image data read from the buffer memory or image data transferred from an external device. Although not shown, the exposure unit 121 is a semiconductor laser light source that irradiates laser light, a polygon mirror that polarizes the laser light at an equiangular velocity, and further polarizes light from the polygon mirror so as to be constant speed on the photosensitive drum 1. An f-θ lens to be moved is provided.

  FIG. 2 is a schematic diagram of the image forming unit 120. As shown in FIG. 2, the image forming unit 120 includes a photosensitive drum 1 that carries an electrostatic latent image. In the periphery of the photosensitive drum 1, toner is supplied to the electrostatic latent image formed on the surface of the photosensitive drum 1 by the charging device 2 that charges the surface of the photosensitive drum 1 to a predetermined potential and the exposure unit 121. The developing device 3 for visualizing, the transfer device 4 for transferring the toner image on the surface of the photosensitive drum 1 to a sheet, the cleaning device 5 for cleaning the surface of the photosensitive drum 1, and the residual charge on the photosensitive drum 1 are neutralized. The light neutralizing device 10 is arranged in this order, and charging, exposure, development, transfer, cleaning, and neutralization processes are performed on the surface of the photosensitive drum 1. Note that a sheet on which a predetermined image forming process has been performed in the image forming unit 120 is heated and fixed by a fixing device 107 provided downstream of the image forming unit 120, and is discharged from the paper discharge roller 137. Paper.

  On the downstream side of the image forming unit 120 and the fixing device 107, a switchback conveyance path 136 that reverses the sheet for forming images on both sides of the sheet and an elevating tray 141 are provided, and the sheet on which the image is fixed is provided. A post-processing device 104 that performs stapling processing or the like is disposed.

  The paper feed unit 103 is disposed below the image forming unit 120, and includes a multi-stage paper feed unit including a manual feed tray 134, a duplex unit 135, paper cassettes 131, 132, and 133, and a storage unit for these sheets ( 131 to 134) are provided with conveying means for conveying the sheet to the image forming unit 120. Note that the duplex unit 135 communicates with the switchback conveyance path 136 and is used when image formation is performed on both sides of the sheet.

  Next, the optical static elimination device 10 will be described. As shown in FIGS. 3 to 5, the light neutralizing device 10 includes an LED lamp 11 that is a point light source and a light guide (made of a light-transmitting material) 12.

  The light guide 12 is mounted on the process cartridge 20 as shown in FIGS. The process cartridge 20 is detachable by sliding on a cartridge guide member 23 attached to the front frame 21 and the rear frame 22 of the main body of the image forming apparatus 100. Here, the entire surface of the light guide 12 used in the light neutralizing device 10 of this example is a smooth surface. The light guide 12 is formed of a transparent material such as acrylic resin, polycarbonate resin, polystyrene resin, vinyl chloride resin, or glass by an injection molding method or an extrusion method.

  As shown in FIG. 3, the light guide 12 is a band-shaped member extending in a direction parallel to the photosensitive drum 1, and a surface facing the photosensitive drum 1 is a light emitting surface 12 b. One end surface (tip surface) in the longitudinal direction of the light guide body 12 is a light incident surface 12a, and the LED lamp 11 faces the light incident surface 12a.

  As shown in FIG. 4A, the light guide 12 is formed with a light guide path portion X1 that becomes a light guide path of light from the LED lamp 11 and a reflection portion X2 that constitutes a charge removal region.

  The reflecting portion X2 is processed so that the back surface 12d is inclined with respect to the light emitting surface 12b, and the back surface 12d approaches the light emitting surface 12b toward the rear end surface 12e of the light guide 12.

  As shown in FIG. 5, the LED lamp 11 is disposed so as to face the end portion 20 a on the front end side in the mounting direction indicated by the arrow M of the process cartridge 20 that is a non-image forming region of the photosensitive drum 1. The LED lamp 11 used in the light neutralizing device 10 of this example is manufactured by bonding an LED chip on a metal lead and sealing the portion in a lens shape with a transparent resin. Near the light incident surface 12a. Examples of the LED lamp 11 include an ultra-bright LED lamp (Sharp, product number: GL5ZJ43) having a wavelength of 618 nm and an experimental resistance value of 200Ω.

<Example 1>
FIG. 6 is a schematic side view illustrating the method for adjusting the arrangement of the LED lamps 11 according to the present embodiment. Here, in order to make the explanation easy to understand, the light from the LED lamp 11 is indicated by an arrow line as parallel light.

  For example, as shown in FIG. 6 (A), when the LED lamp 11 is located at the top of the light incident surface 12a at the beginning of installation, the light incident from the light incident surface 12a is on the light incident surface 12a. Since the light is concentrated, the amount of light reflected by the back surface 12d increases in the portion near the LED lamp 11. In this case, in the axial direction of the photosensitive drum 1, the portion near the LED lamp 11 is strongly irradiated, and the portion far from the LED lamp 11 is not irradiated with sufficient light, and the light is uniformly distributed over the entire area of the photosensitive drum 1. Can not be irradiated. As a result, image unevenness occurs.

  Here, as shown by an arrow P in FIG. 6A, the LED lamp 11 body is moved downward in parallel to the light incident surface 12a, and as shown in FIG. 6B, the light incident surface 12a. Installed at the center in the vertical direction. By moving the LED lamp 11 in this way, the light quantity distribution of the irradiation light irradiated on the photosensitive member is adjusted so that the light reaches far away, so that it is reflected by the entire back surface 12d and spreads over the entire photosensitive drum 1. It is possible to irradiate light uniformly, and image unevenness is less likely to occur.

  On the other hand, as shown in FIG. 6 (C), when the LED lamp 11 is located at a slightly lower position with respect to the light incident surface 12a at the beginning of installation, the light incident from the light incident surface 12a is below the light incident surface 12a. Since the light is concentrated, the amount of light reflected from the back surface 12d increases in the portion far from the LED lamp 11. In this case, in the axial direction of the photosensitive drum 1, a portion far from the LED lamp 11 is strongly irradiated, and a portion near the LED lamp 11 is not irradiated with sufficient light, and light is uniformly distributed over the entire area of the photosensitive drum 1. Can not be irradiated. As a result, image unevenness occurs.

  Here, as indicated by an arrow P ′ in FIG. 6C, the LED lamp 11 body is moved upward in parallel to the light incident surface 12a, and as shown in FIG. 6B, the light incident surface. It is installed at a substantially central portion in the vertical direction of 12a. As a result, even if the light guide plate 12 is attached, the components vary, the LED divergent light varies, etc., the LED lamp 11 is appropriately moved and adjusted as described above so that an appropriate light amount distribution is obtained. Thus, light can be uniformly irradiated over the entire photosensitive drum 1, and a high-quality image free from image unevenness can be obtained.

  In this embodiment, the method of moving the LED lamp up and down has been described as an example. However, a method of adjusting the light distribution by fixing the LED lamp 11 and moving the light guide plate 12 up and down may be used.

<Example 2>
Next, Example 2 will be described. FIG. 7 is a schematic side view illustrating the method for adjusting the arrangement of the LED lamps 11 according to the present embodiment. Here, in order to make the explanation easy to understand, the light from the LED lamp 11 is indicated by an arrow line as parallel light.

  For example, as shown in FIG. 7A, when the direction of the LED lamp 11 is slightly upward with respect to the light incident surface 12a at the beginning of installation, the light incident from the light incident surface 12a is oblique to the light incident surface 12a. Since the light is incident from the bottom to the top, the amount of light reflected by the back surface 12d increases in the portion near the LED lamp 11. In this case, in the axial direction of the photosensitive drum 1, the portion near the LED lamp 11 is strongly irradiated, and the portion far from the LED lamp 11 is not irradiated with sufficient light, and the light is uniformly distributed over the entire area of the photosensitive drum 1. Can not be irradiated. As a result, image unevenness occurs.

  Here, as shown by an arrow Q in FIG. 7A, the direction of the LED lamp 11 is moved downward, and as shown in FIG. 7B, it is installed so as to face almost the center of the light incident surface 12a. . By appropriately moving and adjusting the direction of the LED lamp 11 in this way, the light reaches far, so that it is reflected by the entire back surface 12d and can be irradiated uniformly over the entire photoconductive drum 1. Unevenness is less likely to occur.

  On the other hand, as shown in FIG. 7 (C), when the LED lamp 11 is initially installed with the light incident surface 12a facing slightly downward, the light incident from the light incident surface 12a is obliquely above the light incident surface 12a. From the bottom to the bottom, and is reflected by the light exit surface 12b toward the back surface 12d of the light guide 12. For this reason, the light of LED lamp 11 is not fully radiate | emitted from the light-projection surface 12b. Therefore, sufficient light is not irradiated, and light cannot be irradiated uniformly and sufficiently over the entire area of the photosensitive drum 1. As a result, image unevenness occurs.

  Here, as indicated by an arrow Q ′ in FIG. 7 (A), the LED lamp 11 is moved upward, and as shown in FIG. 7 (B), it is installed so as to face almost the center of the light incident surface 12a. To do. As a result, even if there is light guide plate attachment, component variation, LED divergent light variation, etc., the LED lamp 11 is appropriately moved and adjusted as described above so that an appropriate light amount distribution is obtained. Thus, the light can be irradiated uniformly and sufficiently over the entire photosensitive drum 1, and a high-quality image without image unevenness can be obtained.

<Example 3>
Next, Example 3 will be described. FIG. 8 is a schematic plan view illustrating the method for adjusting the arrangement of the LED lamps 11 according to the present embodiment.

  In addition to those described in the first and second embodiments, the LED lamp 11 may be adjusted by moving the LED lamp 11 back and forth as indicated by the arrow R with respect to the light incident surface 12a of the light guide 12 as an adjustment method. Good. In this case, the intensity of light increases as the LED lamp 11 approaches the light incident surface 12a, and the intensity of light decreases as the LED lamp 11 is moved away from the light incident surface 12a. Therefore, the intensity of light can be adjusted.

  Further, as an adjustment method of the LED lamp 11, the LED lamp 11 may be adjusted by moving left and right as indicated by an arrow S with respect to the light incident surface 12 a of the light guide 12. Or you may adjust by moving the direction of the LED lamp 11 right and left. In this case, the left / right balance of the light emitted from the LED lamp 11 can be adjusted. As a result, even if the light guide plate 12 is attached, the components vary, the LED divergent light varies, etc., the LED lamp 11 is appropriately moved and adjusted as described above so that an appropriate light amount distribution is obtained. Thus, light can be uniformly irradiated over the entire photosensitive drum 1, and a high-quality image free from image unevenness can be obtained.

  In this embodiment, the method of moving the LED lamp has been described as an example, but a method of adjusting the light distribution by fixing the LED lamp 11 and moving the light guide plate 12 may be used.

<Example 4>
Next, Example 4 will be described. FIG. 9 is a schematic diagram of the static elimination unit 300 according to the present embodiment. The static elimination unit 300 includes a frame 301, the light guide plate 12, and the LED lamp 11. The light guide 12 is disposed in the lower part of the frame 301 so that the light emission surface 12b is exposed. The LED lamp 11 is disposed on the side surface portion of the frame 301 so as to face the light incident surface 12 a of the light guide 12.

  Here, when the LED lamp 11 is installed on the frame 301, it is fixed after adjusting the position of the main body or the direction of the lamp by the method shown in the first to third embodiments.

  The static elimination unit 300 in which the LED lamp 11 and the light guide 12 are installed on the frame 301 is mounted on the main body of the image forming apparatus 100 so that the light emission surface 12 b of the light guide 12 faces the photosensitive drum 1. The LED lamp 11 is powered by harness connection or the like after the neutralization unit 300 is attached to the main body.

In addition, regarding the position adjustment of the LED lamp 11, a position adjustment mechanism 11a may be provided. As the position adjustment mechanism 11a, the frame 301 is provided with a holder capable of moving the LED lamp 11, and the holder is moved and adjusted with a screw to adjust the positional relationship with the light guide plate.
After adjusting the position angle with a jig or the like, it is possible to perform adhesive fixing with a UV adhesive or the like. Alternatively, a method of providing a universal joint capable of rotating the LED lamp 11 between the frame 301 and the LED lamp 11 may be used.

  As described above, in the case where the static elimination unit 300 is used, in addition to the effects of the above-described embodiments, the position of the LED lamp 11 on the frame 301 provided with the light guide plate 12 is adjusted in advance. Since it is attached to the main body, it is not necessary to adjust the position of the LED lamp 11 when the main body is assembled, and the assembling efficiency is improved.

  The position adjustment mechanism 11a has been described as being provided in the static elimination unit 300, but may be provided on the main body side of the image forming apparatus 100. The LED lamp 11 may be a position adjustment mechanism that is fixed to the frame 301, moves the light guide plate 12, and adjusts the light distribution.

  Note that, here, an image forming apparatus that forms a monochrome image by one image forming unit 102 is illustrated, but the above-described light neutralizing apparatus 10 can also be applied to a color image forming apparatus. In a color image forming apparatus, each image forming unit is arranged in tandem for each color such as black, magenta, cyan, yellow, etc., and each color forming unit directly forms an image of each color on a recording sheet. Alternatively, each color image is formed by being superimposed on a recording sheet via an intermediate transfer belt. In order to reduce the size of such a color image forming apparatus, it is necessary to reduce the size of each image forming unit. Therefore, it is preferable to apply a small-sized photostatic device for each image forming unit. Since the above-described light neutralizing device 10 has a simple configuration including the light guide 12 disposed to face the photosensitive drum 1 and the LED lamp 11 that irradiates light to the light incident surface of the light guide 12, Miniaturization can be achieved. Therefore, each image forming unit can also be reduced in size, which is effective in realizing a reduction in size of the color image forming apparatus.

  As described above in each of the embodiments, according to the present invention, in an electrophotographic image forming apparatus, even if there is a light guide plate attachment, component variation, LED divergent light variation, or the like, the photosensitive member is irradiated. It is possible to realize an optical static elimination device capable of making the light amount distribution of irradiation light more uniform, and to realize an image forming apparatus including the optical static elimination device having such characteristics.

  The present invention relates to a photostatic discharge device that removes residual charges on a photoreceptor by light irradiation in an electrophotographic image forming process, and an image forming apparatus such as a copier equipped with the photostatic discharge device. In particular, it can be suitably used for uniformizing the light amount distribution of the irradiation light applied to the photosensitive member.

DESCRIPTION OF SYMBOLS 1 Photosensitive drum 2 Charging device 3 Developing device 4 Transfer device 5 Cleaning device 10 Light neutralization device 11 LED lamp 11a Adjustment mechanism 12 Light guide 12a Light incident surface 12b of light guide 12b Light output surface 12d of light guide 12d Light guide 12e Rear end surface of light guide 20 Process cartridge 21 Front frame of main body of image forming apparatus 22 Rear frame of main body of image forming apparatus 23 Cartridge guide member 100 Image forming apparatus 101 Image reading unit 110 Optical system unit 111 First mirror base 112 Second mirror base 113 Lamp reflector assembly 114 First reflecting mirror 115 Second reflecting mirror 116 Third reflecting mirror 117 Optical lens 118 CCD
DESCRIPTION OF SYMBOLS 102 Image formation part 120 Image formation unit 121 Exposure unit 103 Paper feed part 131,132,133 Paper cassette 134 Manual feed tray 135 Duplex unit 136 Switchback conveyance path 137 Paper discharge roller 104 Post-processing device 141 Lifting tray 105 Document placement stand 106 Both sides Automatic document feeder (RADF)
107 Fixing device 300 Static elimination unit 301 Frame

Claims (7)

A photostatic discharge device used to discharge charges on a photoreceptor in an electrophotographic image forming apparatus,
A light guide disposed to face the photoconductor, and a light source that irradiates light to a light incident surface of the light guide,
An optical static elimination device capable of adjusting a position of the light guide and / or the light source.   The light static eliminator according to claim 1, further comprising a position adjustment mechanism that enables position adjustment of the light guide and / or the light source.   The optical neutralization device according to claim 1, wherein the position adjustment is performed by moving the position of the light source with respect to the light guide body in at least one of a front-rear direction, a left-right direction, and a vertical direction.   The optical neutralization apparatus according to claim 1 or 2, wherein the position adjustment is performed by directing the light source with respect to the light guide in at least a horizontal direction or a vertical direction.   The said static adjustment is an optical static elimination apparatus in any one of Claims 1-4 which moves the position of the said light guide with respect to the said light source to at least any one of the front-back direction, the left-right direction, and the up-down direction.   The optical static elimination apparatus in any one of Claims 1-5 provided with the static elimination unit with which the said light guide and the said light source were integrated in the unit. An image forming apparatus comprising the light static eliminator according to claim 1.