CN102087495A - Image forming apparatus - Google Patents
Image forming apparatus Download PDFInfo
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- CN102087495A CN102087495A CN201110025826XA CN201110025826A CN102087495A CN 102087495 A CN102087495 A CN 102087495A CN 201110025826X A CN201110025826X A CN 201110025826XA CN 201110025826 A CN201110025826 A CN 201110025826A CN 102087495 A CN102087495 A CN 102087495A
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- photoreceptor
- roll shape
- mentioned
- charged
- cleaning member
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0208—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus
- G03G15/0216—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers
- G03G15/0225—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices by contact, friction or induction, e.g. liquid charging apparatus by bringing a charging member into contact with the member to be charged, e.g. roller, brush chargers provided with means for cleaning the charging member
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0258—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices provided with means for the maintenance of the charging apparatus, e.g. cleaning devices, ozone removing devices G03G15/0225, G03G15/0291 takes precedence
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0291—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices corona discharge devices, e.g. wires, pointed electrodes, means for cleaning the corona discharge device
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
- G03G21/007—Arrangement or disposition of parts of the cleaning unit
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/02—Arrangements for laying down a uniform charge
- G03G2215/021—Arrangements for laying down a uniform charge by contact, friction or induction
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Physics & Mathematics (AREA)
- Electrostatic Charge, Transfer And Separation In Electrography (AREA)
- Cleaning In Electrography (AREA)
- Discharging, Photosensitive Material Shape In Electrophotography (AREA)
Abstract
The invention relates to an image forming apparatus including a photoreceptor, a roller electric component, a roller cleaning member, an exposer for forming a static latent image on the surface of the photoreceptor , a developer unit for developing the static latent image into a toner image; a transfer print for printing the toner image on a paper, a photoreceptor cleaning member for removing excessive toner remained on the surface of the photoreceptor , and a fuser which fixing the toner image on the paper. The image forming apparatus is characterized in that when the outer perimeter of the photoreceptor is A, the outer perimeter of the roller electric component is B, the outer perimeter of the roller cleaning member is C, and the width of the roller gap between the contact parts of the photoreceptor and the roller electric component, the value of +/- (N/2) which takes interval A as a center, the value of +/- (N/2) which takes interval B as a center and the value of +/- (N/2) which takes interval A as a center are different on the circumferential surface of the photoreceptor within the length scope of an image formed.
Description
The application is to be that the application number on October 30th, 2008 is that 200810175213.2 name is called the dividing an application of female case application of " image processing system " applying date.
Technical field
The present invention relates to a kind of image processing system, it makes it charged for columnar photoreceptor by the charged device of roll shape.
Background technology
Current, for making the charged Charging system of columnar photoreceptor in the image processing system, adopt corona cast or contact electrification type.Here, as the contact electrification type, because the gap between charged device of this roll shape of bias voltage charged roller (BCR) and photoreceptor discharges, so by this gap shape, the concentration spacing that is easy to generate the BCR/ photoreceptor is inhomogeneous.Therefore, in existing image processing system, utilize interchange charged, solve this problem by its charged homogeneity.
In addition, charged as exchanging, owing to there is the cost height of device, problems such as the damage of photoreceptor and clearer, disappearance are so also adopt direct current charged (for example: with reference to patent documentation 1～3).
Patent documentation 1: the spy opens the 2005-034760 communique
Patent documentation 2: the spy opens the 2001-002164 communique
Patent documentation 3: the spy opens flat 7-129055 communique
Summary of the invention
But, and exchange charged comparing, in direct current was charged, the change of the inhomogeneous or shape of the resistance of small photoreceptor membrane thickness unevenness or whirling vibration, BCR all can directly cause charged inhomogeneous.Therefore, and exchange charged comparing, need higher BCR of precision or photoreceptor.And can produce following problem, that is, because this charged susceptibility even the change of BCR or clearer also can cause the pressure variation of BCR, thereby causes charged inhomogeneous (density unevenness is even).And then, even as the just very slight change of each single parts of photoreceptor, BCR, clearer, if but the spacing of its change is synchronous, and then can cause bigger change and make charged inhomogeneous (density unevenness is even) also become big, become the picture quality defective.
The present invention proposes in order to solve above-mentioned problem.That is, the present invention is a kind of image processing system, and it has: columnar photoreceptor; The charged device of roll shape, the outer peripheral face of itself and above-mentioned photoreceptor relatively disposes; The roll shape cleaning member, the outer peripheral face of itself and the charged device of above-mentioned roll shape relatively disposes; Exposer, its surface at above-mentioned photoreceptor forms electrostatic latent image; Developer, it is the toner picture with above-mentioned latent electrostatic image developing; The transfer printing device, it looks like to be transferred to above-mentioned toner on the paper; The photoreceptor cleaning member, it removes the unnecessary toner at the remained on surface of above-mentioned photoreceptor; And fuser, its make above-mentioned toner as photographic fixing to paper, it is characterized in that, outer perimeter at above-mentioned photoreceptor is A, the outer perimeter of the charged device of above-mentioned roll shape is B, the outer perimeter of above-mentioned roll shape cleaning member is C, the roll-gap width of the contact site office of above-mentioned photoreceptor and the charged device of above-mentioned roll shape is under the situation of N, outer peripheral face at above-mentioned photoreceptor, with the position every interval A be the center ± (N/2), with the position every interval B be the center ± (N/2), with the position every interval C be the center ± (N/2) each numerical value, in image forms length range, have nothing in common with each other.
According to image processing system of the present invention, it is characterized in that, with the corresponding circumference of lowest common multiple of the diameter of the diameter of above-mentioned photoreceptor and the charged device of above-mentioned roll shape, with the corresponding circumference of lowest common multiple of the diameter of the diameter of above-mentioned photoreceptor and above-mentioned roll shape cleaning member and with the corresponding circumference of lowest common multiple of the diameter of the diameter of the charged device of above-mentioned roll shape and above-mentioned roll shape cleaning member, be to form the big value of length than image.
According to image processing system of the present invention, it is characterized in that the charged device of above-mentioned roll shape is applied in DC voltage.
According to image processing system of the present invention, it is characterized in that above-mentioned image forms length and is less than or equal to 420mm.
According to image processing system of the present invention, it is characterized in that above-mentioned roll shape cleaning member is made of foam unit.
According to image processing system of the present invention, it is characterized in that above-mentioned roll shape cleaning member has axle, this utilizes the direction pretension of spring to the charged device of above-mentioned roll shape.
According to image processing system of the present invention, it is characterized in that charged device of above-mentioned roll shape and above-mentioned roll shape cleaning member are fixed with constant displacement.
In the invention described above, it is not the girth of photoreceptor 1, but form length (image the forms length) scope of an image by photoreceptor in, each photoreceptor, the charged device of roll shape, roll shape cleaning member make the cycle of charged generation change not overlapping, thereby can suppress the increase of charged inhomogeneous (density unevenness is even).
The effect of invention
Therefore, according to the present invention, because each photoreceptor, the charged device of roll shape, roll shape cleaning member make the cycle of charged generation change not overlapping,, can form uniform image so can suppress to make synchronously the charged inhomogeneous increase of photoreceptor by the change of each parts.
Description of drawings
Fig. 1 is the skeleton diagram of the structure example of the related image processing system of expression present embodiment.
Fig. 2 is the synoptic diagram that the structure of the charged device of roll shape that is adopted in the image processing system of present embodiment is described.
Fig. 3 is the synoptic diagram of the form of the charged device of explanation roll shape.
Fig. 4 is the synoptic diagram that charged inhomogeneous state is described.
Fig. 5 is the figure of object lesson of diameter of each roller of explanation photoreceptor, the charged device of roll shape and roll shape cleaning member.
Fig. 6 is the synoptic diagram of charged uneven example under the situation of expression example 1,2.
Fig. 7 be the expression example 3 situation under charged uneven example synoptic diagram.
Fig. 8 be under the charged situation of expression direct current the photoreceptor belt electric potential with respect to figure to the relation that applies voltage of the charged device of roll shape.
Fig. 9 is that expression exchanges photoreceptor belt electric potential under the charged situation with respect to the figure to the relation that applies voltage of the charged device of roll shape.
Figure 10 represents that the photoreceptor belt electric potential is with respect to the figure of the variation of photoreceptor thickness under the charged situation of direct current.
Figure 11 represents that the photoreceptor belt electric potential is with respect to the figure of the variation of photoreceptor thickness under the charged situation of interchange.
Embodiment
Below, with reference to the accompanying drawings, embodiments of the present invention are described.
(schematic configuration of image processing system)
Fig. 1 is the skeleton diagram of the structure example of the related image processing system of expression present embodiment.In Fig. 1, the columnar photoreceptor 1 that becomes image-carrier is set to and can the direction of arrow (around counterclockwise) rotates in figure.Around photoreceptor 1,, dispose successively: the charged device 2 of roll shape, laser scanner (exposer) 3, developer 4, transfer printing device 5, photosensitive drums clearer 6 and remove electrical equipment 7 according to the photosensitive drums sense of rotation.In addition, on the transfer path R of paper, dispose fuser 8 in the paper conveyance direction downstream of transfer printing device 5.
The charged device 2 of roll shape is used to make the surface of photoreceptor 1 charged equably, and outer peripheral face with photoreceptor 1 is relative disposes for it, be driven in photoreceptor 1 rotation and with photoreceptor 1 reverse rotation.On the charged device 2 of this roll shape, relatively be provided with roll shape cleaning member 20 with outer peripheral face, it plays the effect of removal attached to the toner on the charged device 2 of roll shape.
Laser scanner 3 exposes/scans the surface of photoreceptor 1 according to raster image, thereby forms electrostatic latent image on the surface of photoreceptor 1.Developer 4 is supplied with toner by the surface to photoreceptor 1, and making the latent electrostatic image developing on the photoreceptor 1 is the toner picture.
(structure of the charged device of roll shape)
Fig. 2 is the synoptic diagram that the structure of the charged device of roll shape that adopts in the image processing system of present embodiment is described.In the figure, photoreceptor 1 and the roll shape cleaning member 20 relative have also been represented with the charged device of roll shape 2.
That is, the charged device 2 of roll shape is called as bias voltage charged roller (BCR), and the surface of itself and columnar photoreceptor 1 relatively disposes.The charged device 2 of roll shape for example is made of foam unit, and axle utilizes spring to photoreceptor 1 side pretension, is fixed with constant displacement.Thus, be driven in the rotation of photoreceptor 1 and be rotated.At this moment, the contact portion of the charged device of roll shape 2 and photoreceptor 1 along the length setting of sense of rotation as roll-gap width.Roll-gap width is about 0.5mm～3mm.
In addition, at the charged device 2 of roll shape and opposition side photoreceptor 1, relatively dispose roll shape cleaning member 20.Roll shape cleaning member 20, it utilizes the direction pretension of spring to the charged device 2 of roll shape, is fixed with constant displacement.
The charged device 2 of roll shape that constitutes by said structure, when rotated and the charged gap between photoreceptor 1 surface (having crossed the gap at nip location place) locate to discharge, make the surface of photoreceptor 1 charged successively along with the rotation of photoreceptor 1.Charged gap is about 100 μ m～200 μ m.Therefore, because the gap shape in charged gap (gap axially at the discharge position place of photosensitive surface changes) makes photoreceptor 1 produce charged inhomogeneous (density unevenness is even) easily.
Here, as shown in Figure 3, the charged device 2 of roll shape has the type that directly contacts with photoreceptor 1 and the type of indirect contact.That is, in the charged device 2 of the roll shape shown in Fig. 3 (a), the surface of photoreceptor 1 directly contacts with the surface of the charged device 2 of roll shape, thereby the rotation of photoreceptor 1 directly is passed on the roller of the charged device 2 of roll shape.In direct contact-type, the charged device 2 of roll shape becomes nip location with the direct contact portion of photoreceptor 1.
On the other hand, in the charged device 2 of the roll shape shown in Fig. 3 (b), the surface of photoreceptor 1 does not directly contact with the surface of the charged device 2 of roll shape, and the driven voller 2a that is arranged on the roll end of the charged device 2 of roll shape contacts with photoreceptor 1 and driven, is made the roller rotation of the charged device 2 of roll shape by this rotation.Any structure no matter all utilizes the gap between the surface of the roller surface of the charged device 2 of roll shape and photoreceptor 1 to discharge, and makes the surface charging of photoreceptor 1.In the indirect contact type, the driven voller 2a of the charged device 2 of roll shape and the contact portion of photoreceptor 1 become nip location.
Like this, the charged device 2 of roll shape utilizes the charged gap between itself and photoreceptor 1 surface to discharge, because the change in charged gap and inhomogeneous (charged inhomogeneous) can appear in charged homogeneity.This is charged inhomogeneous, the inhomogeneous or shape influence of change, influenced by the shape of roll shape cleaning member 20 or whirling vibration except the resistance of the membrane thickness unevenness that is subjected to photoreceptor 1 or whirling vibration, the charged device 2 of roll shape.And, sometimes these roller monomers influence mutual superposition, can cause bigger charged inhomogeneous.
Present embodiment is characterised in that, in the charged structure of having used the charged device 2 of above-mentioned roll shape, sets the diameter of photoreceptor 1, the charged device 2 of roll shape and roll shape cleaning member 20, so that the charged inhomogeneous influence that brings that each roller causes can not superpose.
Specifically, set the diameter of the charged device 2 of diameter, roll shape of photoreceptor 1 and the diameter of roll shape cleaning member 20 respectively, so that photoreceptor 1 surface charged inhomogeneous and that periodically produced by the rotation of roll shape cleaning member 20 on photoreceptor 1 surface charged inhomogeneous, that periodically produced by the rotation of the charged device 2 of roll shape on photoreceptor 1 surface that is periodically produced by the rotation of photoreceptor 1 is charged inhomogeneous, can be not overlapping in image forms length range.In addition, the diameter of the charged device 2 of said here roll shape for the direct contact-type shown in Fig. 3 (a), is meant the diameter of the roller of the charged usefulness that contacts with photoreceptor 1, for the indirect contact type shown in Fig. 3 (b), be meant the diameter of the driven voller 2a that contacts with photoreceptor 1.
Here, so-called image forms length, is meant along the length of an image forming area of the sense of rotation of photoreceptor 1, is meant in the full-size of employed medium (paper) in image processing system, along the length of direction of transfer.For example, use under the situation of size of the such paper of the B4 that stipulates among the JIS (Japanese Industrial Standards) or B5, A3 or A4, be meant wherein this length along the longest paper of the length of direction of transfer at image processing system.
As realizing preventing the charged inhomogeneous overlapping example that above-mentioned each roller causes, the outer perimeter of photoreceptor 1 be the outer perimeter of A, the charged device 2 of roll shape be the outer perimeter of B, roll shape cleaning member 20 be C, photoreceptor 1 with the contact portion of the charged device 2 of roll shape in roll-gap width be under the situation of N (with reference to Fig. 2), on the outer peripheral face of photoreceptor 1, make with the position every interval A be the center ± (N/2), with the position every interval B be the center ± (N/2), with the position every interval C be the center ± (N/2), not overlapping in image forms the scope of length.
Promptly, on photoreceptor 1, the charged device 2 of roll shape and roll shape cleaning member 20 periphery separately, exist and produce charged uneven zone, with comprise roll-gap width interior all charged inhomogeneous on photoreceptor 1 position overlapped be that each roller of starting point is rotated, until next time all charged inhomogeneous overlapping till, it is long that the length on the photoreceptor 1 forms length than image.Thus, make comprise roll-gap width each interior roller cause charged uneven overlapping, in image forms the scope of length, can not produce.
Fig. 4 is the synoptic diagram that charged inhomogeneous state is described.Because charged inhomogeneously caused by each photoreceptor, the charged device of roll shape and roll shape cleaning member so periodically produce with the rotation of roller, considers that a charged uneven width (figure middle-end edge direction) is roll-gap width to the maximum.In charged uneven example shown in Figure 4, for convenience of explanation, show equate with roll-gap width charged inhomogeneous and form banded state, but in fact produce the charged inhomogeneous of different shape.
For example, in the example shown in Fig. 4 (a), show the state of the adjacent generation of charged inhomogeneous b that causes by some charged inhomogeneous a that causes in photoreceptor, the charged device of roll shape and the roll shape cleaning member with by another one.That is, in the image forming area scope, charged inhomogeneous a and charged inhomogeneous b are not overlapping, produce in different positions respectively.
On the other hand, in the example shown in Fig. 4 (b), show the state of charged inhomogeneous some the overlapping generation of b that causes by the some charged inhomogeneous a that causes in photoreceptor, the charged device of roll shape and the roll shape cleaning member with by another one.Like this, overlapping if in the image forming area scope by a plurality of charged inhomogeneous a, b that differential roller produces respectively, then, become the state that charged state worsens significantly for this overlapping part.Therefore, this charged uneven overlapping by preventing, can suppress charged uneven deterioration.
Like this, charged uneven overlapping in order to prevent in the image forming area scope, in the present embodiment, set photoreceptor, the charged device of roll shape and roll shape cleaning member roller diameter separately.Promptly, since by each roller of photoreceptor, the charged device of roll shape and roll shape cleaning member cause charged inhomogeneous, on each each roller, periodically produce, thus set each roller diameter, so that it is big to form length based on the lowest common multiple of the value of each roller diameter than image.In addition, at this moment, consider the roll-gap width (contact length along sense of rotation of contact portion) of the contact site office between photoreceptor and the charged device of roll shape, set the diameter of each roller, charged uneven overlapping so that arbitrary part of roll-gap width does not all produce.
Thus, the cycle of charged inhomogeneous (the comprising roll-gap width) that makes that each roller by photoreceptor, the charged device of roll shape and roll shape cleaning member causes interior charged inhomogeneous, not overlapping in image forms length range, thus charged uneven deterioration can be suppressed.And, owing to only can tackle by setting roller diameter, therefore can not cause that because of increasing special construction significantly cost rises, and not require unnecessary high precision, so can under the situation that does not cause all the other obstruction, improve the picture quality defective for each parts.
(concrete example)
Fig. 5 is the figure of concrete example of diameter of each roller of explanation photoreceptor, the charged device of roll shape and roll shape cleaning member.In addition, the unit of numerical value shown in Figure 5 is mm, for convenience of explanation, is the value of the situation of not considering roll-gap width.In addition, example 1, example 2 are the situations of not carrying out the setting of each roller diameter shown in the present embodiment, and example 3 is the situations of having carried out the setting of each roller diameter shown in the present embodiment.And the full-size of carrying out the paper of image formation in example 1 is A4, and is A3 in example 2, example 3.
Here, the charged uneven example under the situation of each roller diameter shown in the example 1 of presentation graphs 5 among Fig. 6 (a).In the example 1 of Fig. 5, the diameter of photoreceptor is 24mm, the diameter of the charged device of roll shape is 9mm, the diameter of roll shape cleaning member is 8mm, in above-mentioned roller, be that the lowest common multiple of 72mm, photoreceptor diameter and roll shape cleaning member diameter is that the lowest common multiple of charged device diameter of 24mm, roll shape and roll shape cleaning member diameter is to overlap in cycle of the pairing circumference of diameter (about 226mm, about 75mm, about 226mm) of 72mm with lowest common multiple respectively with photoreceptor diameter and the charged device diameter of roll shape.They cause forming in length (A4 vertically the is 297mm) scope at the pairing image of full-size (being A4 in the example 1) that carries out the paper that image forms and overlap, therefore as Fig. 6 (a) shown in, with bigger charged inhomogeneous of this spacing generation.
In addition, the charged uneven example under the situation of each roller diameter shown in the example 2 of presentation graphs 5 among Fig. 6 (b).In the example 2 of Fig. 5, the diameter of photoreceptor is that the diameter of 30mm, the charged device of roll shape is 12mm, the diameter of roll shape cleaning member is 9mm, in above-mentioned roller, be that the lowest common multiple of 60mm, photoreceptor diameter and roll shape cleaning member diameter is that the lowest common multiple of charged device diameter of 90mm, roll shape and roll shape cleaning member diameter is to overlap in cycle of the pairing circumference of diameter (about 188mm, about 282mm, about 113mm) of 36mm with lowest common multiple respectively with photoreceptor diameter and the charged device diameter of roll shape.They cause forming in length (A3 vertically the is 420mm) scope at the pairing image of full-size (being A3 in the example 2) that carries out the paper that image forms and overlap, therefore as Fig. 6 (b) shown in, with bigger charged inhomogeneous of this spacing generation.
In addition, the charged uneven example under the situation of each roller diameter shown in the example 3 of presentation graphs 5 among Fig. 7.In example shown in Figure 53, the diameter of photoreceptor is 30mm, the diameter of the charged device of roll shape is 14mm, the diameter of roll shape cleaning member is 11mm, in above-mentioned roller, be that the lowest common multiple of 210mm, photoreceptor diameter and roll shape cleaning member diameter is that the lowest common multiple of charged device diameter of 330mm, roll shape and roll shape cleaning member diameter is to overlap in cycle of the pairing circumference of diameter (about 659mm, 1036mm, 483mm) of 154mm with lowest common multiple respectively with photoreceptor diameter and the charged device diameter of roll shape.It is big that they form length (A3 vertically is 420mm) than the pairing image of full-size (being A3 in the example 3) that carries out the paper that image forms, and therefore as shown in Figure 7, can not produce big charged inhomogeneous in image forms length range.
Hence one can see that, in the example 1 of the setting of not carrying out each roller diameter shown in the present embodiment, example 2, in charging zone, produce bigger charged inhomogeneous, relative therewith, in the example 3 of the setting of carrying out each roller diameter shown in the present embodiment, in charging zone, do not produce big charged inhomogeneous.Promptly, in example 1, example 2, produce by a plurality of rollers cause charged uneven overlapping, make charged inhomogeneous increase, but in example 3, do not produce by a plurality of rollers cause charged uneven overlapping, only show as independent charged inhomogeneous of each roller, thereby can suppress charged uneven increase.
In addition, in above-mentioned concrete example, to being illustrated as the example that image forms length with the full-size of paper, can be that image forms length also with the length setting of the scope of the actual formation image in the full-size of paper, in this scope, make charged inhomogeneous not overlapping.
(direct current charged with exchange charged)
In the contact electrification of having used the charged device of roll shape, because the roller of the charged device of roll shape and the trickle gap variation between the photosensitive surface are easy to generate charged inhomogeneous (density unevenness is even).Particularly, in the direct current that applies DC voltage to the charged device of roll shape is charged, in the membrane thickness unevenness that exchanges photoreceptor no problem in charged, also can be as charged inhomogeneous and show significantly.And, if the charged uneven spacing of each parts is synchronous, then can become bigger inhomogeneous and become the picture quality defective.
Here, to direct current charged with exchange charged relatively describing.Fig. 8 is that the photoreceptor belt electric potential is with respect to the figure to the relation that applies voltage of the charged device of roll shape under the charged situation of expression direct current, and Fig. 9 is that expression exchanges photoreceptor belt electric potential under the charged situation with respect to the figure to the relation that applies voltage of the charged device of roll shape.The thickness of photoreceptor is as parameter in Fig. 8, but for arbitrary thickness, under the charged situation of direct current, the photoreceptor belt electric potential all can increase with the voltage that applies of the charged device of roll shape with being directly proportional.
On the other hand, under the charged situation of interchange shown in Figure 9, though charged current potential with apply voltage and increase with being directly proportional, the increase that begins charged current potential from certain position is saturated.Therefore, exchanging under the charged situation, applying voltage, can suppress the change of the charged current potential that causes by the change that applies voltage by in the saturated scope of charged current potential, setting.On the contrary, under the charged situation of direct current, the change that applies voltage has a significant impact the change of charged current potential.
In addition, Figure 10 is that the photoreceptor belt electric potential is with respect to the figure of the variation of photoreceptor thickness under the charged situation of expression direct current, and Figure 11 represents that the photoreceptor belt electric potential is with respect to the figure of the variation of photoreceptor thickness under the charged situation of interchange.In addition, in Figure 10, Figure 11, the measuring position of the thickness in the photoreceptor is as parameter.Under the charged situation of direct current shown in Figure 10, along with the thickness thickening of photoreceptor, the photoreceptor belt electric potential reduces.On the other hand, under the charged situation of interchange shown in Figure 11, even the thickness thickening of photoreceptor, the photoreceptor belt electric potential can not show big variation yet.Therefore, exchanging under the charged situation, the photoreceptor thickness is little to the influence of charged current potential, and is relative therewith, and under the charged situation of direct current, the variation of photoreceptor thickness has a significant impact the change of charged current potential.
Thus, under the charged situation of direct current, especially, and the diameter of each roller of photoreceptor, the charged device of roll shape and roll shape cleaning member or the control difficulty of photoreceptor thickness, overlapping by the charged inhomogeneous meeting that each roller causes, produce bigger charged inhomogeneous.
Therefore, in the present embodiment, except exchanging charged situation, particularly under the charged situation of direct current, remove charged uneven overlapping and effect that the homogeneity inhibition zone electric potential worsens is more obvious.
Claims (7)
1. image processing system, it has:
Columnar photoreceptor;
The charged device of roll shape, the outer peripheral face of itself and above-mentioned photoreceptor relatively disposes;
The roll shape cleaning member, the outer peripheral face of itself and the charged device of above-mentioned roll shape relatively disposes;
Exposer, its surface at above-mentioned photoreceptor forms electrostatic latent image;
Developer, it is the toner picture with above-mentioned latent electrostatic image developing;
The transfer printing device, it looks like to be transferred to above-mentioned toner on the paper;
The photoreceptor cleaning member, it removes the unnecessary toner at the remained on surface of above-mentioned photoreceptor; And
Fuser, its make above-mentioned toner as photographic fixing to paper,
It is characterized in that,
At the outer perimeter of above-mentioned photoreceptor is that the outer perimeter of A, the charged device of above-mentioned roll shape is that the outer perimeter of B, above-mentioned roll shape cleaning member is that the roll-gap width of the contact site office of C, above-mentioned photoreceptor and the charged device of above-mentioned roll shape is under the situation of N,
At the outer peripheral face of above-mentioned photoreceptor, with the position every interval A be the center ± N/2, with the position every interval B be the center ± N/2, with the position every interval C be the center ± each numerical value of N/2, in image forms length range, have nothing in common with each other.
2. image processing system according to claim 1 is characterized in that,
With the corresponding circumference of lowest common multiple of the diameter of the diameter of above-mentioned photoreceptor and the charged device of above-mentioned roll shape, with the corresponding circumference of lowest common multiple of the diameter of the diameter of above-mentioned photoreceptor and above-mentioned roll shape cleaning member and with the corresponding circumference of lowest common multiple of the diameter of the diameter of the charged device of above-mentioned roll shape and above-mentioned roll shape cleaning member, be to form the big value of length than image.
3. image processing system according to claim 1 is characterized in that,
The charged device of above-mentioned roll shape is applied in DC voltage.
4. image processing system according to claim 1 is characterized in that,
Above-mentioned image forms length and is less than or equal to 420mm.
5. image processing system according to claim 1 is characterized in that,
Above-mentioned roll shape cleaning member is made of foam unit.
6. image processing system according to claim 1 is characterized in that,
Above-mentioned roll shape cleaning member has axle, and this utilizes the direction pretension of spring to the charged device of above-mentioned roll shape.
7. image processing system according to claim 1 is characterized in that,
Charged device of above-mentioned roll shape and above-mentioned roll shape cleaning member are fixed with constant displacement.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007-321694 | 2007-12-13 | ||
| JP2007321694A JP4661863B2 (en) | 2007-12-13 | 2007-12-13 | Image forming apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101752132A Division CN101458475B (en) | 2007-12-13 | 2008-10-30 | Image forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102087495A true CN102087495A (en) | 2011-06-08 |
| CN102087495B CN102087495B (en) | 2015-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101752132A Active CN101458475B (en) | 2007-12-13 | 2008-10-30 | Image forming device |
| CN201110025826.XA Active CN102087495B (en) | 2007-12-13 | 2008-10-30 | Image forming apparatus |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008101752132A Active CN101458475B (en) | 2007-12-13 | 2008-10-30 | Image forming device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP4661863B2 (en) |
| KR (1) | KR101109025B1 (en) |
| CN (2) | CN101458475B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8320013B2 (en) * | 2009-08-27 | 2012-11-27 | Xerox Corporation | Synchronization of variation within components to reduce perceptible image quality defects |
| JP7006072B2 (en) * | 2017-09-21 | 2022-01-24 | 富士フイルムビジネスイノベーション株式会社 | Image forming device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2847524B2 (en) * | 1989-04-14 | 1999-01-20 | キヤノン株式会社 | Charging device |
| US7477862B2 (en) * | 2004-02-09 | 2009-01-13 | Ricoh Company, Ltd. | Charged device, cleaning device, process cartridge, toner, and image-forming device that uses these |
| CN100529982C (en) * | 2004-11-26 | 2009-08-19 | 株式会社理光 | Image forming apparatus and process cartridge |
| JP4882312B2 (en) * | 2005-08-25 | 2012-02-22 | 富士ゼロックス株式会社 | Method for producing fluororesin-coated member |
| JP2007121543A (en) * | 2005-10-26 | 2007-05-17 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP5140920B2 (en) * | 2005-11-04 | 2013-02-13 | 富士ゼロックス株式会社 | Image forming apparatus |
| JP2007171288A (en) * | 2005-12-19 | 2007-07-05 | Fuji Xerox Co Ltd | Charging device |
| JP2007199264A (en) * | 2006-01-25 | 2007-08-09 | Fuji Xerox Co Ltd | Image forming apparatus |
| JP5162831B2 (en) * | 2006-02-01 | 2013-03-13 | 富士ゼロックス株式会社 | Image forming apparatus |
| KR100846789B1 (en) * | 2006-06-05 | 2008-07-16 | 삼성전자주식회사 | Charging roller cleaning device and electrophotographic apparatus adopting the same |
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2007
- 2007-12-13 JP JP2007321694A patent/JP4661863B2/en not_active Expired - Fee Related
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2008
- 2008-09-01 KR KR1020080085719A patent/KR101109025B1/en active IP Right Grant
- 2008-10-30 CN CN2008101752132A patent/CN101458475B/en active Active
- 2008-10-30 CN CN201110025826.XA patent/CN102087495B/en active Active
Also Published As
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|---|---|
| KR20090063072A (en) | 2009-06-17 |
| CN101458475B (en) | 2012-07-04 |
| JP4661863B2 (en) | 2011-03-30 |
| JP2009145528A (en) | 2009-07-02 |
| CN102087495B (en) | 2015-02-25 |
| CN101458475A (en) | 2009-06-17 |
| KR101109025B1 (en) | 2012-01-31 |
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