CN101021702A - Pre-transferring charged device and image forming device having same - Google Patents

Pre-transferring charged device and image forming device having same Download PDF

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CN101021702A
CN101021702A CN 200710005798 CN200710005798A CN101021702A CN 101021702 A CN101021702 A CN 101021702A CN 200710005798 CN200710005798 CN 200710005798 CN 200710005798 A CN200710005798 A CN 200710005798A CN 101021702 A CN101021702 A CN 101021702A
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voltage
mentioned
charged
electrode
image
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CN100487598C (en
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香川敏章
大西英树
木田裕士
增田佳昭
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Sharp Corp
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Sharp Corp
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Abstract

A charge device before transferring is provided, which is capable of reducing generation of discharging generating product such as ozone, nitrogen oxide and the like, has a good charge evenness, and can continuously perform stable charge in a long time and restrain disorder of a toner image. The charge device before transferring includes an ion generation needle configured relatively to an image carrier such as a photosensitive drum, a middle transferring band, or the like; and a high-voltage power supply that supplies a negative voltage to the ion generation needle, wherein the voltage supplied by the high-voltage power supply is larger than an ion generation start voltage and less than a corona discharging start voltage, in this way, negative ions would not be generated together with corona discharging, thereby problems resulted by corona discharging can be solved.

Description

Pre-transferring charged device and have the image processing system of this device
Technical field
The present invention relates to a kind ofly in the image processing system that uses the electrofax mode, make the toner image on the image-carrier (for example photoreceptor, intermediate transfer body) be transferred to the preceding charged pre-transferring charged device of transfer printing object (for example intermediate transfer body, recording paper).And the invention still further relates to a kind of image processing system with above-mentioned pre-transferring charged device.
Background technology
All the time, in the image processing system that utilizes the electrofax mode, the Charging system that is used for making the photoreceptor uniform charged, be used to make the toner image that forms on the photoreceptor be electrostatically transferred to recording paper etc. transfer device, be used to peel off the stripping off device of recording paper of contacting with static such as photoreceptors etc., often use the Charging system of corona discharge mode.
The Charging system of this corona discharge mode generally uses: corona tube mode (corotron), it has: radome, have with photoreceptor, recording paper etc. by charged thing opening opposing portion; Be erected at the wire or the jagged sparking electrode of this radome inside,, produce corona discharge, make by charged thing uniform charged by applying high pressure to sparking electrode; Or so-called super corona tube mode (scorotron), at sparking electrode with between gate electrode is set by charged thing, by applying required voltage, make by charged thing uniform charged (reference literature 1) to this gate electrode.
Figure 18 is the synoptic diagram of charged mechanism of the Charging system of existing corona discharge mode.As above above-mentioned, the Charging system of corona discharge mode is made of following: the sparking electrode 101 of wire, zigzag or needle-like; Comparative electrodes (discharge object) such as the image-carrier 102 of formation toner image 104, gate electrode 103.Image-carrier 102 comprises photoreceptor, intermediate transfer body.And, by between little sparking electrode 101 of radius-of-curvature and comparative electrode (discharge thing object), applying high pressure, between these two electrodes, form uneven electric field, the ionizing event of the part that causes by near the highfields that produce the sparking electrode 101 is carried out electronics and is emitted (discharge that electron avalanche causes), makes as charged by the photoreceptor of charged thing, intermediate transfer body, toner image etc.And gate electrode 103 is used to control towards image-carrier 102 grades by the amount of electrons of charged thing, and this gate electrode 103 is also carried out electron discharge.
Further, for example in document 2,3, disclose Charging system with above-mentioned corona discharge mode and be used to make the charged pre-transferring charged device of toner image before being transferred to offset mediums such as intermediate transfer body, recording paper.Technology according to document 2,3, even there is the carried charge inequality in the toner image that forms on the image-carrier, also can make toner image carried charge equalization before transfer printing, the decline of the transfer printing allowance in the time of therefore can suppressing the transfer printing toner image stably is transferred to offset medium with toner image.
But there are a lot of problems in above-mentioned existing Charging system.
The first, in the Charging system of existing corona discharge mode, there are a large amount of ozone (O that produce 3), oxides of nitrogen (NO x) wait the problem of discharge product.Particularly, by the energy (electron bombardment etc.) of following above-mentioned electron discharge, nitrogen molecular (N 2) be decomposed into nitrogen-atoms (N), itself and oxygen molecule (O 2) combination, generate oxides of nitrogen (nitrogen dioxide: NO 2).Equally, oxygen molecule (O 2) be decomposed into oxygen atom (O), itself and oxygen molecule (O 2) combination, generate a large amount of ozone (O 3).
When ozone generates in a large number, can cause the problems such as accessory deterioration that the generation of ozone smell, harmful influence, strong oxidizing force cause.And when generating oxides of nitrogen, oxides of nitrogen is attached to photoreceptor as ammonium salt (ammonium nitrate), becomes the reason that causes image abnormity.Particularly, normally used Organophotoreceptor (OPC) is because of ozone, No xBe easy to produce image deflects such as whiting, image stream.
And oxides of nitrogen is attached to the gate electrode of the Charging system of corona discharge mode, makes the surface oxidation corrosion of gate electrode, thereby secondary generates the metal oxide of insulativity on gate electrode, consequently, destroy charged homogeneity, caused the problem of the image deterioration that charged inequality causes.
Therefore, form in the device, though preferred the upstream at (a plurality of primary transfer position, and secondary transfer printing position) is provided with pre-transferring charged device at all transfer printing positions, because ozone, No at the coloured image of the intermediate transfer mode that has a plurality of transfer printings position xThe problem of generation and comparatively the difficulty.
And, photoreceptor also needs to be used to form the Charging system of latent image, therefore consider the harmful effect to photoreceptor, pre-transferring charged for the toner image of carrying out forming on the photoreceptor appended pre-transferring charged device and is difficulty comparatively outside above-mentioned Charging system.In fact, for fear of this problem, have only use the ozone generating amount less, can be just charged, have good anti-brush, can force to remove the amorphous silicon photoreceptor body of the discharge product that photosensitive surface adheres to.
And, in the last few years,,, adopted the contact electrification mode of conductive rollers, conduction brush as making the charged Charging system of photoreceptor self in order to realize the odorless oxidation, but not upsetting toner image ground, the contact electrification mode do not carry out charged comparatively difficulty.Therefore, in pre-transferring charged device, though adopted the device of non-contacting corona discharge mode, when the pre-transferring charged device of existing corona discharge mode is set, also can lose this feature of ozone free in the image processing system that has carried the contact electrification mode.
In addition, the technology as reducing the ozone growing amount for example discloses a kind of Charging system in the document 4, and it has: a plurality of sparking electrodes, arrange on predetermined direction of principal axis with basic certain spacing; High-voltage power supply applies voltage greater than discharge ionization voltage to sparking electrode; Resistance is arranged between the output electrode and sparking electrode of high-voltage power supply; Gate electrode near sparking electrode, is arranged on this sparking electrode and by on the position between the charged thing; Grid power supply applies grid voltage to gate electrode, and wherein, making the gap between sparking electrode and the gate electrode is below the 4mm, reduces discharge current and reduces the ozone generating amount.
But in the technology of above-mentioned document 4, though can reduce the ozone generating amount by reducing discharge current, the reduction amount of ozone is also inadequate, produces the ozone about 1.0ppm.And also have following other problems: discharge product, toner, paper powder etc. are attached to sparking electrode, or because of the front end of discharge energy guiding discharge electrode weares and teares, deterioration, thereby the guiding discharge instability.
Further, owing to sparking electrode and less, also there is the problem of the charged inequality of the length direction (spacing direction of sparking electrode) that is easy to produce the spacing that is derived from a plurality of sparking electrodes by the gap between the charged thing.At this, can consider to dwindle the sparking electrode spacing in order to eliminate charged inequality, but so the sparking electrode number increases, manufacturing cost increases.
On the other hand, second problem of existing Charging system is the problem of corona wind (being also referred to as " ozone wind ").Corona wind is to flow because of the electronics under the corona discharge shown in the arrow 105 of Figure 18, from sparking electrode towards being produced by charged thing.Therefore, when the Charging system with existing corona discharge mode is used for pre-transferring charged device, can produce the problem of toner image 104 disorders on the image-carrier 102 because of corona wind.
Document 1: the publication communique spy of Japan opened flat 6-11946 communique (open day: on January 21st, 1994)
Document 2: the publication communique spy of Japan opened flat 10-274892 communique (open day: on October 13rd, 1998)
Document 3: the publication communique spy of Japan opened the 2004-69860 communique (open day: on March 4th, 2004)
Document 4: the publication communique spy of Japan opened flat 8-160711 communique (open day: on June 21st, 1996)
Document 5: the publication communique spy of Japan opened the 2005-316395 communique (open day: on November 10th, 2005)
Summary of the invention
The present invention produces in view of above problem just, its purpose is to provide a kind of generation that reduces discharge products such as ozone, oxides of nitrogen, has good charged homogeneity, can continue for a long time to carry out stable charged, and can suppress toner image disorder pre-transferring charged device and pre-transferring charged method and have the image processing system of above-mentioned pre-transferring charged device.
In order to solve above-mentioned problem, pre-transferring charged device of the present invention is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; With first voltage applying unit, produce the voltage that begins voltage more than the beginning voltage, less than corona discharge to the above-mentioned charged ion that applies with electrode.
And, in order to solve above-mentioned problem, pre-transferring charged method of the present invention is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, to the charged voltage that begins voltage more than the ion generation beginning voltage, less than corona discharge that applies with electrode of relative configuration with above-mentioned image-carrier.
Pre-transferring charged device that relates to of the present invention and pre-transferring charged method are that the toner image on the image-carrier (for example intermediate transfer bodies such as photoreceptor, intermediate transfer belt or intermediate transfer rollers) that is used to make image processing system is transferred to the preceding charged pre-transferring charged method of transfer printing object (for example above-mentioned intermediate transfer body, recording paper).
According to above-mentioned structure, the voltage that ion is produced size more than the beginning voltage is applied to the charged electrode of using, and therefore produces ion, can make the toner image on the image-carrier charged by the ion that produces.And, begin voltage owing to be applied to charged voltage swing less than corona discharge with electrode, therefore can not produce corona discharge.So can not produce ozone, NO substantially xMake toner image charged.And, owing to be not attended by corona discharge,, can carry out stable charged for a long time so can not produce that discharge product is attached to electrode as the Charging system of existing corona discharge mode or because of discharge energy causes the problem of the wearing and tearing of electrode front end, deterioration.Further, owing to do not produce corona discharge, therefore can not produce corona wind yet.Therefore can suppress the wind-induced toner image disorder of corona.And, compare with the Charging system of existing corona discharge mode, the electric field of formation a little less than, therefore as the extendability that is had by near the distribution of the ionic weight the toner image of charged thing to a certain degree.Therefore compare with existing corona discharge mode, can improve charged homogeneity.
In order to solve above-mentioned problem, the pre-transferring charged device that the present invention relates to is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; With first voltage applying unit, produce voltage more than the beginning voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentionedly chargedly begin distance greater than corona discharge with the interval between the electrode.
And, in order to solve above-mentioned problem, the pre-transferring charged method that the present invention relates to is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, ion is produced voltage more than the beginning voltage be applied to the charged electrode of using with the relative configuration in the interval that begins distance greater than corona discharge with above-mentioned image-carrier.
It is preceding charged that pre-transferring charged device that relates to of the present invention and pre-transferring charged method are used to make the toner image on the image-carrier (for example intermediate transfer bodies such as photoreceptor, intermediate transfer belt or intermediate transfer rollers) of image processing system to be transferred to transfer printing object (for example above-mentioned intermediate transfer body, recording paper).
According to above-mentioned structure, the voltage that ion is produced size more than the beginning voltage is applied to the charged electrode of using, and therefore produces ion, can make the toner image on the image-carrier charged by the ion that produces.And, begin distance with the interval between electrode and the image-carrier greater than corona discharge owing to charged, therefore can not produce corona discharge.So can not produce ozone, NO substantially xMake toner image charged.And, owing to be not attended by corona discharge,, can carry out stable charged for a long time so can not produce that discharge product is attached to electrode as the Charging system of existing corona discharge mode or because of discharge energy causes the problem of the wearing and tearing of electrode front end, deterioration.Further, owing to do not produce corona discharge, therefore can not produce corona wind yet.Therefore can suppress the wind-induced toner image disorder of corona.And, compare with the Charging system of existing corona discharge mode, the electric field of formation a little less than, therefore as the extendability that is had by near the distribution of the ionic weight the toner image of charged thing to a certain degree.Therefore compare with existing corona discharge mode, can improve charged homogeneity.
And, in order to solve above-mentioned problem, the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit produces more than the beginning voltage, begins the voltage that the anxious voltage that increases is the anxious increase of ozone beginning voltage less than the ozone generating amount to the above-mentioned charged ion that applies with electrode.
And, in order to solve above-mentioned problem, the pre-transferring charged device that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, has the charged electrode of using, dispose relative with above-mentioned image-carrier, by charged to apply with electrode that ion produces more than the beginning voltage, begins the anxious voltage that increases less than the ozone generating amount be that the voltage of the anxious increase of ozone beginning voltage produces ion to above-mentioned, make above-mentioned transfer printing object charged by this ion.
And, in order to solve above-mentioned problem, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, the charged of relative configuration with above-mentioned image-carrier applied more than the ion generation beginning voltage, begins the voltage that the anxious voltage that increases is ozone anxious increase beginning voltage less than the ozone generating amount with electrode.
And, in order to solve above-mentioned problem, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, to the charged electrode of using of relative configuration with above-mentioned image-carrier, apply ion produce beginning voltage above, less than the ozone generating amount begin the anxious voltage that increases be the voltage of the anxious increase of ozone beginning voltage to produce ion, make above-mentioned transfer printing object charged by this ion.
According to above-mentioned structure, the voltage that ion is produced size more than the beginning voltage is applied to the charged electrode of using, and therefore produces ion, can make the toner image on the image-carrier charged by the ion that produces.And, suddenly establish beginning voltage owing to be applied to charged voltage swing newly less than ozone with electrode, therefore can not produce ozone, NO substantially xMake toner image charged.And, by suppressing ozone, can not produce that discharge product is attached to electrode as the Charging system of existing corona discharge mode or because of discharge energy causes the problem of the wearing and tearing of electrode front end, deterioration, can carry out stable charged for a long time.Further, owing to can reduce the ozone growing amount, therefore can suppress corona wind.Therefore can suppress the wind-induced toner image disorder of corona.And, compare with the Charging system of existing corona discharge mode, the electric field of formation a little less than, therefore as the extendability that is had by near the distribution of the ionic weight the toner image of charged thing to a certain degree.Therefore compare with existing corona discharge mode, can improve charged homogeneity.
And in order to solve above-mentioned problem, the pre-transferring charged device that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit produces the voltage that begins more than the voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentioned charged with the ozone anxious increase beginning distance of the interval between the electrode greater than the distance that begins as the ozone generating amount suddenly to increase.
And, in order to solve above-mentioned problem, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, ion is produced the voltage that begins more than the voltage, be applied to suddenly to establish the charged electrode of using of the relative configuration in interval of beginning distance newly greater than the ozone that begins the anxious distance that increases as the ozone generating amount with above-mentioned image-carrier.
According to above-mentioned structure, the voltage that ion is produced size more than the beginning voltage is applied to the charged electrode of using, and therefore produces ion, can make the toner image on the image-carrier charged by the ion that produces.And, establish beginning distance with the interval between electrode and the image-carrier greater than ozone is anxious owing to charged, so can not produce ozone, NO substantially xMake toner image charged.And, by suppressing ozone, can not produce that discharge product is attached to electrode as the Charging system of existing corona discharge mode or because of discharge energy causes the problem of the wearing and tearing of electrode front end, deterioration, can carry out stable charged for a long time.Further, owing to can reduce the ozone growing amount, therefore can suppress corona wind.Therefore can suppress the wind-induced toner image disorder of corona.And, compare with the Charging system of existing corona discharge mode, the electric field of formation a little less than, therefore as the extendability that is had by near the distribution of the ionic weight the toner image of charged thing to a certain degree.Therefore compare with existing corona discharge mode, can improve charged homogeneity.
And, in order to solve above-mentioned problem, the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit produces more than the beginning voltage, begins the voltage that the anxious voltage that increases is the anxious increase of electric current beginning voltage less than flowing through charged electric current with electrode to the above-mentioned charged ion that applies with electrode.
And, in order to solve above-mentioned problem, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, the charged electrode of using to relative configuration with above-mentioned image-carrier, apply ion produce beginning voltage above, be the anxious voltage of establishing the voltage that begins newly of electric current less than flowing through the anxious voltage that increases of charged electric current (in other words, supplying to charged electric current (down with)) with electrode since first voltage applying unit with electrode.
According to above-mentioned structure, the voltage that ion is produced size more than the beginning voltage is applied to the charged electrode of using, and therefore produces ion, can make the toner image on the image-carrier charged by the ion that produces.And owing to be applied to charged voltage swing with electrode less than the anxious increase of electric current beginning voltage, therefore not have bigger electric current in electrode mobile charged, can not produce ozone, NO substantially xMake toner image charged.And, by suppressing ozone, can not produce that discharge product is attached to electrode as the Charging system of existing corona discharge mode or because of discharge energy causes the problem of the wearing and tearing of electrode front end, deterioration, can carry out stable charged for a long time.Further, owing to can reduce the ozone growing amount, therefore can suppress corona wind.Therefore can suppress the wind-induced toner image disorder of corona.And, compare with the Charging system of existing corona discharge mode, the electric field of formation a little less than, therefore as the extendability that is had by near the distribution of the ionic weight the toner image of charged thing to a certain degree.Therefore compare with existing corona discharge mode, can improve charged homogeneity.
And in order to solve above-mentioned problem, the pre-transferring charged device that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit, produce voltage more than the beginning voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentioned charged to begin the anxious distance that increases be the anxious distance that begins of establishing newly of electric current greater than flowing through charged electric current with electrode with the interval between the electrode.
And, in order to solve above-mentioned problem, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, ion is produced the voltage that begins more than the voltage, be applied to begin the charged electrode of using that the anxious distance that increases is the relative configuration with above-mentioned image-carrier in interval of the anxious increase of electric current beginning distance greater than flowing through charged electric current with electrode.
According to above-mentioned structure, the voltage that ion is produced size more than the beginning voltage is applied to the charged electrode of using, and therefore produces ion, can make the toner image on the image-carrier charged by the ion that produces.And, since charged with the interval between electrode and the image-carrier greater than the anxious increase of electric current beginning distance, therefore not have bigger electric current in electrode mobile charged, can not produce ozone, NO substantially xMake toner image charged.And, by suppressing ozone, can not produce that discharge product is attached to electrode as the Charging system of existing corona discharge mode or because of discharge energy causes the problem of the wearing and tearing of electrode front end, deterioration, can carry out stable charged for a long time.Further, owing to can reduce the ozone growing amount, therefore can suppress corona wind.Therefore can suppress the wind-induced toner image disorder of corona.And, compare with the Charging system of existing corona discharge mode, the electric field of formation a little less than, therefore as the extendability that is had by near the distribution of the ionic weight the toner image of charged thing to a certain degree.Therefore compare with existing corona discharge mode, can improve charged homogeneity.
And the image processing system that the present invention relates to is to carry out the image processing system that image forms by the electrofax mode, it is characterized in that, has above-mentioned any one pre-transferring charged device, reaches above-mentioned image-carrier.
In existing image processing system, because the problems referred to above are difficult to append the toner image that is provided with forming on the image-carrier and carry out pre-transferring charged Charging system.But in image processing system of the present invention,, can suppress the generation of discharge products such as ozone, oxides of nitrogen, improve transfer efficiency by using above-mentioned pre-transferring charged device.
Other purposes of the present invention, feature, and advantage can be able to clearly by following record.And advantage of the present invention by with reference to the following explanation of accompanying drawing also can be able to clearly.
Description of drawings
Fig. 1 is the key diagram of the charged mechanism of the pre-transferring charged device that relates to of expression an embodiment of the invention.
Fig. 2 is the sectional view of the structure of the image processing system with pre-transferring charged device that relates to of expression an embodiment of the invention.
Fig. 3 is the outboard profile of the pre-transferring charged device that relates to of an embodiment of the invention.
Fig. 4 is the front view (FV) of the pre-transferring charged device that relates to of an embodiment of the invention.
Fig. 5 is the key diagram that the structure of the 1 negative ion producing component that uses is tested in expression.
Fig. 6 (a) is the result's of the experiment 1 when representing not insert fixed resistance a chart, and Fig. 6 (b) is the result's of the experiment 1 of expression when having inserted fixed resistance a chart.
Fig. 7 be in the expression negative ion producing component shown in Figure 5, measured apart from charged with electrode distance and the result's of the relation of negative ion amount (density) chart.
Fig. 8 is the key diagram that the structure of 2 experimental provisions that use is tested in expression.
Fig. 9 be expression have and when not having gate electrode, the result's of the surface potential feature of comparison on the photoreceptor length direction chart.
Figure 10 is the key diagram of the structure of the experimental provision that uses of presentation graphs 3.
Figure 11 (a) and Figure 11 (b) are the charts of the investigation result of the expression relation that applies voltage and photosensitive surface current potential, total current, ozone generating amount, result when fixed resistance is not inserted in Figure 11 (a) expression, the result when fixed resistance has been inserted in Figure 11 (b) expression.
Figure 12 (a) and Figure 12 (b) are that expression will apply voltage, reach by the gap of charged thing and charged usefulness electrode as parameter, only produce the condition of ion and produce the chart of investigation result of the condition of corona discharge, result when fixed resistance is not inserted in Figure 12 (a) expression, the result when fixed resistance has been inserted in Figure 12 (b) expression.
Figure 13 is the chart that is illustrated in the investigation result of the relation of the carried charge of current amount flowing and toner in the intermediate transfer belt.
Figure 14 be expression according to current amount flowing in intermediate transfer belt on one side FEEDBACK CONTROL apply the chart of investigation result that voltage carries out the carried charge of toner image toner image when charged, charged front and back on one side.
Figure 15 is the figure that the different investigation result of pre-transferring charged secondary transfer printing efficient when not carrying out has been carried out in expression.
Figure 16 is the outboard profile of the charged variation with electrode that has of the pre-transferring charged device that relates to of expression an embodiment of the invention.
Figure 17 is the outboard profile of the charged variation with electrode that has of the pre-transferring charged device that relates to of expression an embodiment of the invention.
Figure 18 is the schematic illustration of charged mechanism of the Charging system of the existing corona discharge mode of expression.
Figure 19 (a) is the relation that applies voltage and ozone generating amount shown in expression Figure 11 (a), and with respect to the chart of the rate of change β of the recruitment α of the ozone generating amount of the recruitment that applies voltage.Figure 19 (b) is the relation that applies voltage and total current shown in expression Figure 11 (a), and with respect to the chart of the rate of change γ of the recruitment θ of the total current of the recruitment that applies voltage.
Figure 20 (a) is the relation that applies voltage and ozone generating amount shown in expression Figure 11 (b), and with respect to the chart of the rate of change β of the recruitment α of the ozone generating amount of the recruitment that applies voltage.Figure 20 (b) is the relation that applies voltage and total current shown in expression Figure 11 (b), and with respect to the chart of the rate of change γ of the recruitment θ of the total current of the recruitment that applies voltage.
Figure 21 (a) and Figure 21 (b) are illustrated in the Charging system that other embodiments of the present invention relate to, it is charged for ozone generating amount and total current are suddenly made by charged thing with increasing, apply voltage, reach by the chart of the condition in the gap of charged thing and charged usefulness electrode, result when fixed resistance is not inserted in Figure 21 (a) expression, the result when fixed resistance has been inserted in Figure 21 (b) expression.
Embodiment
(embodiment 1)
First embodiment of the present invention is described.Fig. 2 is the sectional view of summary structure of the image processing system 100 of the pre-transferring charged device 2,3 of expression with present embodiment.This image processing system 100 is so-called in-line, and is the printer of intermediate transfer formula, can form full-color image.
As shown in Figure 2, image processing system 100 has: 4 looks (C, M, Y, K) visual image forms unit 50a～50d, transfer printing unit 40, reaches fixing device 14.
Transfer printing unit 40 has: intermediate transfer belt 15 (image-carrier), be configured in Charging system 3 before 4 primary transfer device 12a～12d around this intermediate transfer belt 15, the secondary transfer printing, secondary transfer printing device 16, and transfer printing with cleaning device 17.
Intermediate transfer belt 15 be used to make by visual image form unit 50a～50d visual the overlapping transfer printing of toner image of all kinds, and the toner image of transfer printing is transferred to recording paper again.Particularly, intermediate transfer belt 15 is ring-type wheel bands, set up by a pair of driven roller and dummy roll, and (being 124mm/s in the present embodiment) is transmitted driving to be controlled to be predetermined peripheral speed when image forms.
Primary transfer device 12a～12d is arranged on each visual image and forms on unit 50a～50d, and each primary transfer device 12a～12d is configured in the opposition side that corresponding visual image forms unit 50a～50d across intermediate transfer belt 15.Charging system 3 is used to make the toner image with intermediate transfer belt 15 overlapping transfer printings charged once more before the secondary transfer printing, specifically discusses after a while, in the present embodiment, makes toner image charged by emitting ion.
The toner image that secondary transfer printing device 16 is used for being transferred on the intermediate transfer belt 15 is transferred to recording paper again, contacts setting with intermediate transfer belt 15.Transfer printing is used to clean with cleaning device 17 has carried out the toner image surface of the intermediate transfer belt 15 after the transfer printing again.
In addition, around the intermediate transfer belt 15 of transfer printing unit 40, begin to dispose successively from the direction of transfer upstream of middle transfer belt 15: Charging system 3 before primary transfer device 12a～12d, the secondary transfer printing, secondary transfer printing device 16, transfer printing are with cleaning device 17.
Recording paper direction of transfer downstream at secondary transfer printing device 16 is provided with fixing device 14.Fixing device 14 is used for recording paper is arrived in the toner image photographic fixing that is transferred to by secondary transfer printing device 16 on the recording paper.
And in the intermediate transfer belt 15,4 visual images form unit 50a～50d along approaching setting of wheel band direction of transfer.4 visual images form unit 50a～50d except the toner color difference of using, and other are identical, use the toner of yellow (Y), pinkish red (M), blue or green (C), black (K) respectively.Only illustrate that below visual image forms unit 50a, other visual images form unit 50b～50d and omit its explanation.
Visual image forms unit 50a to have: photosensitive drums (image-carrier) 1, be configured in latent image around this photosensitive drums 1 with Charging system 4, laser writing unit (not shown), developing apparatus 11, primary transfer before Charging system 2, cleaning device 13 etc.
Latent image is used to make the surface band predetermined potential of photosensitive drums 1 with Charging system 4.Latent image is discussed after a while with the details of Charging system 4, in the present embodiment, utilized by latent image to make photosensitive drums 1 charged with the ion that Charging system 4 produces.
The laser writing unit is according to image data received from external device, and to photosensitive drums 1 irradiation (exposure) laser, scan light picture on the photosensitive drums 1 of uniform charged writes electrostatic latent image.
Developing apparatus 11 is used for going up the electrostatic latent image that forms to photosensitive drums 1 surface provides toner, makes the electrostatic latent image development and forms toner image.It is charged again before transfer printing that Charging system 2 is used to make the toner image of photosensitive drums 1 surface formation before the primary transfer, and details are discussed after a while, in the present embodiment, make toner image charged by emitting ion.
Cleaning device 13 is used to remove, reclaim toner image is transferred to residual toner on the photosensitive drums 1 behind the intermediate transfer belt, can write down new electrostatic latent image and toner image on photosensitive drums 1.
And, form at visual image unit 50a photosensitive drums 1 around, begin to dispose successively from the sense of rotation upstream of photosensitive drums 1: latent image with Charging system 4, laser writing unit, developing apparatus 11, primary transfer before Charging system 2, primary transfer device 12a, cleaning device 13.
The image that image processing system 100 then is described forms action.
At first, image processing system 100 is obtained view data from external device (ED).And the not shown driver element of image processing system 100 rotates photosensitive drums 1 with predetermined speed (is 124mm/s at this) on the direction of arrow shown in Figure 2, and latent image makes the surface band predetermined potential of photosensitive drums 1 with Charging system 4.
Then, according to the view data that obtains, the laser writing unit makes the face exposure of photosensitive drums 1, carries out on the surface of photosensitive drums 1 and the writing of the electrostatic latent image of above-mentioned view data correspondence.Afterwards, the electrostatic latent image that forms is gone up on photosensitive drums 1 surface, developing apparatus 11 provides toner.So, make toner be attached on the electrostatic latent image and form toner image.
And primary transfer device 12a makes toner image be transferred to intermediate transfer belt 15 by applying the bias voltage of going up the toner image opposite polarity that forms with photosensitive drums 1 surface.
Visual image forms unit 50a～50d and carries out this action successively, thereby Y, M, C, K four look toner image are overlapped onto on the intermediate transfer belt 15 successively.
Overlapping toner image is sent to Charging system 3 before the secondary transfer printing by intermediate transfer belt 15, and to the toner image that transmits, Charging system 3 carries out charged again before the secondary transfer printing.And the intermediate transfer belt 15 that secondary transfer printing device 16 has carried out charged again toner image with carrying is crimped onto the recording paper that never illustrated paper supply unit transmits, thereby makes toner image be transferred to recording paper.
Afterwards, fixing device 14 makes the toner image photographic fixing to recording paper, has write down the record images paper and has been discharged to paper feeder unit (not shown).And after above-mentioned transfer printing, toner residual on the photosensitive drums 1 is removed, reclaims by cleaning device 13, and residual toner is removed, reclaims with cleaning device 17 by transfer printing on the intermediate transfer belt 15.
By above action, can on recording paper, carry out suitable printing.
Then specify the structure of Charging system.Charging system 3 before Charging system 2, the secondary transfer printing before the above-mentioned primary transfer, except the position difference was set, other were all identical with Charging system 4 for latent image, were identical devices.Below describe the preceding Charging system 2 of primary transfer in detail, omit the detailed description of Charging system before the secondary transfer printing 3, latent image being used Charging system 4.
Fig. 3 is the outboard profile of Charging system 2 before the primary transfer, and Fig. 4 is the front view (FV) (from the figure of length direction observation) of Charging system 2 before the primary transfer.
As shown in Figure 3, Charging system 2 has before the primary transfer: negative ion producing component 20, radome (ions diffusion limiting part) 23, fixed resistance (resistor) 24, high-voltage power supply (voltage applying unit) 25, voltage control division (voltage control unit) 31.
The structure of negative ion producing component 20 is, the ion of a plurality of (being 32 here) needle-like produced pin (the charged electrode of use) 21 dispose with predetermined spacing p on the substrate 22 of metallic (being stainless steel here).It is diameter 1mm that each ion produces pin 21, and the front end radius-of-curvature is the tungsten (purity 99.999%) of 15 μ m, and each ion produces the direction of the front end of pin 21 towards photosensitive drums 1, and the spacing p that each ion produces between the pin 21 is 10mm.
And negative ion producing component 20 disposes to such an extent that make each ion produce the photosensitive drums 1 of pin 21 near diameter 30mm, and the gap g that each ion produces pin 21 and photosensitive drums 1 is 10mm.
The negative terminal of high-voltage power supply 25 is that the fixed resistance 24 of 200M Ω is connected to substrate 22 by resistance value.Thus, the ion of installing on substrate 22 produces pin 21 and applies predetermined DC voltage.Like this, apply predetermined DC voltage to negative ion producing component 20, thereby produce negative ion, make the predetermined carried charge (being about-20 μ C/g here) of toner image band on the photosensitive drums 1 by high-voltage power supply 25.And the high-voltage power supply 25 when in the present embodiment, image forms is applied to and initially applies voltage Va on the substrate 22 oFor-6.5kV.
And voltage control division 31 is connected to high-voltage power supply 25.Voltage control division 31 is used to control the size that applies voltage Va of high-voltage power supply 25.Particularly, voltage control division 31 changes the voltage Va that applies of high-voltage power supply 25 interimly, and measures the current value in photosensitive drums 1 surface flow, try to achieve this current value become desired value high-voltage power supply 25 apply voltage Va, and carry out FEEDBACK CONTROL, making and applying voltage Va is the value of trying to achieve.
Carried charge in the size of the electric current of photosensitive drums 1 surface flow and toner image is relevant.Therefore keep certain desired value by the electric current that makes photosensitive drums 1 surface, the carried charge that can make toner image is a certain value.
Therefore, according to the size of current that in photosensitive drums 1, flows through, the size that applies voltage Va of FEEDBACK CONTROL high-voltage power supply 25, even thus since foreign matter be attached to leading section that ion produces pin 21, changes in environmental conditions, and image processing system 100 in wind direction variation etc., when the ratio of the ion arrival toner image of negative ion generation, generation etc. changes, also can always an amount of negative ion be provided to toner image.
And, around negative ion producing component 20, have peristome (the width w=26mm of peristome in the present embodiment) in photosensitive drums 1 side, on the face opposite, be provided with peristome have air inlet port 28, the cross section is the radome 23 of " コ " word shape.Insulativity material that this radome 23 is made of resin etc. or high-resistance material (having the material that does not produce the resistance value of corona discharge in electrode 21 charged) constitute.In other words, this radome 23 is made of insulativity material or the high-resistance material (having the material that can not cause the anxious resistance value that increases of ozone generating amount because of the charged movement of electric charges that produces with electrode 21) that resin etc. constitutes.In addition, shown in following experiment, the material of this radome 23 for example can use the insulativity ABS resin.
By this radome 23 is set, can suppress diffusion by the negative ion of negative ion producing component 20 generations, by with the direction of negative ion guiding, can improve the utilization ratio of ion to photosensitive drums 1.Consequently, for example gap g is set at 25mm when above, the negative ion amount more than 50% (density) in the time of can guaranteeing gap g=5mm.And the parts that can suppress preceding Charging system 2 peripheries of primary transfer are unnecessarily charged.
And as above above-mentioned, radome 23 electrical isolations, or be high resistance even therefore the interval between negative ion producing component 20 and the radome 23 is shorter, also can prevent from radome 23 is produced corona discharges.In other words, move, can prevent that the ozone generating amount from suddenly increasing by electric charge to radome 23.This radome 23 can float by electricity, in radome 23 accumulation electric charge is arranged, when ion produces decrease in efficiency, but also ground connection is escaped charges accumulated.
In addition, Charging system 2 also can produce at ion gate electrode (control electrode) further is set between pin 21 and the photosensitive drums 1 before the primary transfer.By gate electrode being set and applying voltage with high-voltage power supply (second voltage applying unit) to it, remaining ion is reclaimed by gate electrode, make the ionic weight homogenising of being emitted by charged thing, therefore can reduce the charged inequality of the length direction that spacing that ion produces pin 21 causes, suitably control is by the surface potential of charged thing.
Pre-transferring charged device 2,3, latent image charged mechanism Charging system 4, that use negative ion then is described.Fig. 1 is the figure that the pre-transferring charged device 2,3 of expression, latent image are used the charged mechanism of Charging system 4.
Because the front end radius-of-curvature of the leading section of ion generation pin 21 is very little, therefore when having applied high pressure, the leading section periphery that produces pin 21 at ion forms very strong electric field.And compare with the Charging system of existing corona discharge mode, as bigger by the gap g on the image-carriers such as the photosensitive drums 1 of charged thing (charged object), intermediate transfer belt 15, therefore the electric field intensity between ion generation pin 21 and the image-carrier is less, and electronics can't be released to image-carrier.But by the effect that ion produces the peripheral highfield that forms of leading section of pin 21, airborne molecule (oxygen molecule, nitrogen molecular, carbon dioxide molecule etc.) ionization is positive ion and electronics.And the electronics of ionization combines (electron attachment) with airborne molecule, becomes negative ion.And the part of positive ion produces pin 21 by ion and electric charge is provided and reverts to molecule, and a part revert to the earth.
The negative ion that produces produces the line of electric force that forms between the leading section of pin 21 and the image-carrier along ion, is released to the image-carrier side.But compare with the Charging system of existing corona discharge mode, the electric field of formation a little less than, therefore the ion that produces not is the direction that all is released to photosensitive drums 1, exists a part to be diffused into the ion of the direction different with the direction of photosensitive drums 1 yet.And, by arriving the negative ion on photosensitive drums 1 surface, photosensitive drums 1 band predetermined potential.
And, when being provided with gate electrode, producing between the leading section of pin 21 and the gate electrode at ion and also to form line of electric force, therefore the negative ion that produces is also emitted towards gate electrode.And in the part of image carrier surface current potential rising (charged), remaining negative ion adds to gate electrode, and electric charge (electronics) is provided, so the current potential Be Controlled of image carrier surface must keep certain passing through negative ion.
According to pre-transferring charged device 2,3, the latent image Charging system 4 of present embodiment, the energy when ion produces is compared very little with existing corona discharge.Therefore compare also very for a short time when the decomposition of nitrogen molecular, oxygen molecule is with existing corona discharge, can significantly reduce NO x, ozone generation.And, owing to can not produce corona wind substantially, the toner image disorder can not appear yet.
Then explanation is in order to confirm that making negative ion be released to photosensitive drums 1 by the ion that replaces corona discharge can make the electronegative experimental result of carrying out of photosensitive drums.
(experiment 1)
At first prepare negative ion producing component 20a shown in Figure 5.
The structure of negative ion producing component 20a is, the ion generation pin 21 of a plurality of (being 3 here) needle-like is fixing on the substrate 22 of metallic (being stainless steel here).Ion produces pin 21 by diameter 1mm, and the front end radius-of-curvature is that the tungsten (purity 99.999%) of 15 μ m constitutes, and the spacing that each ion produces between the pin 21 is 10mm.
With this negative ion producing component 20a be arranged on 1m on every side with interior except following air suction inlet the space without any device, when the negative terminal side of high-voltage power supply 25 connects negative ion producing component 20a, and when the negative terminal side of high-voltage power supply 25 fixed resistance 24 by resistance value 200M Ω connects negative ion producing component 20a, measure generation, ozone generating amount, and the magnitude of current of this moment of the negative ion when applying voltage.That is, following two kinds of situations are experimentized: when between negative ion producing component 20a and high-voltage power supply 25, inserting the fixed resistance 24 of resistance value 200M Ω, and two kinds of situations when not inserting.And, the MODEL610C that high-voltage power supply 25 uses Trek company to make, the AIC-2000 that the negative ion measuring appliance uses assistant rattan Itochu to make, the ozone monitor EG2002F that ozonoscope uses weak former industrial corporation to make, negative ion produces pin 21 and has the position of 150mm, ozone amount at distance and produces pin 21 and have at distance and on the position of 10mm air suction inlet is set and measures.
Fig. 6 (a) is the experimental result when representing not insert fixed resistance 24, and Fig. 6 (b) is the chart of the experimental result of expression when having inserted fixed resistance 24.
Shown in Fig. 6 (a), when not inserting fixed resistance 24, begin to produce negative ion from applying voltage-2.5kV.And, shown in Fig. 6 (b), when inserting fixed resistance 24, begin to produce negative ion from applying voltage-2kV.And, insert or when not inserting fixed resistance 24, along with the rising that applies voltage (applying the rising of the absolute value of voltage), negative ion amount (ion generation) is anxious to be increased, substantially 1 * 10 7Individual/cc is saturated.And, insert or when not inserting fixed electorde 24, ozone does not produce substantially.
From this result as can be known, if under the negative ion producing component 20a of needle-like shown in Figure 5 discharges the state of object around, do not apply high pressure, then can not produce ozone substantially, and can generate negative ion in a large number.
In addition, compare when not inserting fixed resistance 24, when inserting fixed resistance 24, the lower reason of size that negative ion produces beginning voltage is, the generation of ion is to be imaginary positive electrode with atmosphere, the potential difference (PD) that is produced between the pin 21 by atmosphere and ion produces, but the impedance of this atmosphere is very unstable, therefore when not having fixed resistance 24, also can begin in the zone that ion produces with the low voltage that applies, it is unstable that the generation of ion becomes, if insert fixed resistance 24 with it relatively, the resulting impedance that then comprises the atmosphere impedance is more stable, so the generation of ion itself also becomes stable.
Then insert fixed resistance 24, making and applying voltage is-3kV that measuring distance produces the distance L of pin 21 and the relation of negative ion amount (density).Fig. 7 is its result's of expression a chart, and the negative ion amount during with L=5mm is 100%, relatively represents the negative ion amount of L＞5mm.
As shown in the drawing, the density of negative ion becomes more little when L is big more.And as shown in Figure 7,, can guarantee negative ion amount (density) more than 50% with respect to the negative ion amount under the position of L=5mm (density) in the position of L≤25mm.
(experiment 2)
Then measure the charged characteristic of above-mentioned negative ion producing component 20a by experiment to photosensitive drums 1.At first utilize Fig. 8 illustrative experiment device.
For the photosensitive drums 1 that the Organophotoreceptor (OPC) of the diameter 30mm, the thickness 30 μ m that can any circumference speed be supported rotatably constitutes, configuration negative ion producing component 20a on the position of leaving predetermined gap g.And, can on the base station that moves on the photoreceptor direction (not shown), gap g can be set arbitrarily in the scope of 0～30mm by negative ion producing component 20a is configured in.And, can measure the electric current (total current) that in negative ion producing component 20a, flows by galvanometer A1.
And, produce between pin 21 and the photosensitive drums 1 at the ion of negative ion producing component 20a, dispose the gate electrode 26 that the stainless steel by thick 0.1mm constitutes.In addition, the fixed interval between gate electrode 26 and the photosensitive drums 1 is 1.5mm.Gate electrode 26 is connected with the negative terminal of high-voltage power supply 27, can apply voltage arbitrarily.And, can measure the electric current (grid current) that in gate electrode 26, flows by galvanometer A2.
Further, on the position relative with negative ion producing component 20a from photosensitive drums 1 began position with respect to downstream 90 degree of the sense of rotation of this photosensitive drums 1, configuration surface pot probe 30 can be measured the surface potential of photosensitive drums 1.And surface potential meter probe 30 is arranged on and can not only can measures the circumferencial direction of photosensitive drums 1 on the base station that scans on the length direction of photosensitive drums 1 (not shown), and can measure the surface potential feature of length direction.And, the MODEL344 that the surface potential meter uses TereK company to make, the peripheral speed of photosensitive drums 1 is 124mm/s.And, ion generation, ozone generating amount are carried out and tested 1 the same measurement, measure the electric current that in photosensitive drums 1, flows by galvanometer A3.
And experiment condition is, gap g=20mm, and the voltage that applies that is applied to negative ion producing component 20a is-7.7kV, is applied to applying voltage and being-900V of gate electrode 26, to inserting and experimentizing respectively when not inserting gate electrode 26.
Fig. 9 is the chart of this experimental result of expression, and expression has and the comparative result of the surface potential feature of length direction when not having gate electrode 26, photosensitive drums 1.The result of negative ion generation and ozone generating amount is measured in table 1 expression.In addition, the transverse axis of Fig. 9 is represented the distance with respect to the length direction of photosensitive drums 1, and the longitudinal axis is represented the surface potential of photosensitive drums 1.For the distance on the length direction of the photosensitive drums 1 of transverse axis, above-mentioned three ions are produced the length direction configuration of pin 21 along photosensitive drums 1, the ion generation pin 21 relative location tables of photosensitive drums 1 and central authorities are shown 0.
(table 1)
The negative ion generation (individual/cc) Ozone generating amount (ppm)
Non-grid 18,000,000 0.002
Grid is arranged 18,000,000 0.003
As shown in Figure 9, no matter have or not gate electrode 26, the surface of photosensitive drums 1 is all charged.And as shown in table 1, negative ion has produced (18,000,000/cc), but do not produce ozone (0.002ppm～0.003ppm) substantially of sufficient amount.When producing corona discharge, should produce a large amount of ozone, but in this experiment owing to do not produce ozone substantially, so as can be known, in this experiment to the charged generation effect of photosensitive drums 1 be not corona discharge, but negative ion.That is, can make photosensitive drums 1 fully charged by negative ion as can be known.
And, as shown in Figure 9, when gate electrode 26 not being set, the position according to three radical ions produce pin 21 produces fluctuation (three peak values) on surface potential, and when gate electrode 26 is set, therefore this minimizing of fluctuating has been verified, by gate electrode 26 is set, can suppress the fluctuation of surface potential, improve the controlled of surface potential.
(experiment 3)
Then measure the charged characteristic of above-mentioned negative ion producing component 20a by experiment to toner image.At first with reference to Figure 10 illustrative experiment device.
As shown in figure 10, experimental provision uses and tests 2 the identical device of device.Just in this experiment 3, do not use surface potential meter probe 30 and galvanometer A3.
The illustrative experiment method at first, is utilized not shown color digital compounding machine (Sharp makes AR-C280), forms the toner image of not photographic fixing on OHP paper.Image forms the polyester toner that the toner that uses uses particle diameter 8.5 μ m, and as not photographic fixing toner image, the formation adhesion amount is 0.6mg/cm 2Real image.And, measure the carried charge of the not photographic fixing toner image that forms by aspiration-type mini zone electrical quantity measurement arrangement (Trek company make MODEL 210HS-2A).
Then, to paste photosensitive drums 1 surface with the above-mentioned same OHP paper that has formed not photographic fixing toner image, applying under the state of predetermined voltage to negative ion producing component 20a and gate electrode 26, make photosensitive drums 1 with predetermined peripheral speed rotation, make not photographic fixing toner image through the zone relative, thereby carry out the charged of toner image with ion generation pin 21.And, measure the carried charge of toner image, the carried charge of the toner image of more charged front and back after charged once more.And the same with experiment 1, ion generation, ozone generating amount are also measured.
In addition, experiment condition is, gap g=20mm is-7.7kV to the voltage that applies of negative ion producing component 20a, and is applied to applying voltage and being-900V of gate electrode 26, to inserting and experimentizing respectively when not inserting gate electrode 26.
Table 2 is tables of this experimental result of expression, and expression has and carried charge when not having gate electrode 26, toner image, negative ion generation, and the measurement result of ozone generating amount.
(table 2)
Toner carried charge (μ C/g) The negative ion generation (individual/cc) Ozone generating amount (ppm)
Before charged After charged Recruitment
Non-grid -12.8 -20.5 7.7 18,000,000 0.002
Grid is arranged -12.8 -18.3 5.5 18,000,000 0.003
As shown in table 2, no matter have or not gate electrode 26, the carried charge of toner image all increases.And, though negative ion produces (18,000,000/cc), do not produce ozone (0.002ppm～0.003ppm) substantially of sufficient amount.When producing corona discharge, should produce a large amount of ozone, but in this experiment owing to do not produce ozone substantially, so as can be known, in this experiment to the charged generation effect of toner image be not corona discharge, but negative ion.That is, verified and to utilize negative ion to make toner image fully charged.
And as can be known, compare when having gate electrode, when not having gate electrode, the recruitment of the carried charge of toner is bigger.
(experiment 4)
Below study the condition that more stably produces negative ion by experiment.According to above-mentioned experiment 2 and test 3 result, negative ion has identical tendency to the charged of photosensitive drums 1 with to toner image charged, in this experiment 4, is by charged thing with photosensitive drums 1 therefore.
In this experiment, utilize above-mentioned experimental provision shown in Figure 8, investigation is applied to the surface potential V that applies voltage Va and photosensitive drums 1 of negative ion producing component 20a o, total current It, ozone generating amount relation.Experiment condition is, gap g=10mm is applied to applying voltage and being-700V of gate electrode 26, to inserting and two kinds of situations when not inserting fixed resistance 24 experimentize respectively.
Figure 11 (a) is the chart of the measurement result when representing not insert fixed resistance 24, the chart of the measurement result when fixed resistance 24 has been inserted in Figure 11 (b) expression.
Shown in Figure 11 (a), when improving gradually when being applied to the size that applies voltage Va (absolute value) of negative ion producing component 20a, at first near-the 3.75kV, the surface of photosensitive drums 1 begins charged (charged beginning voltage), when further raising is big or small, surface potential V oAbsolute value also become big along with applying voltage Va.And, for the generation of ozone, before being 5kV, the absolute value that applies voltage Va can not produce substantially, when surpassing 5kV, rise along with applying voltage Va, and its generation also suddenly increases.
From this result as can be known, when the size that applies voltage Va (absolute value) for more than the 3.75kV, the time less than 5kV, owing to be more than the size (2.5kV) of the ion generation beginning voltage when not having fixed resistance 24, therefore it is charged to utilize negative ion to carry out, when becoming 5kV when above, owing to produce ozone, therefore except ion produces, also produce corona discharge.
And shown in Figure 11 (b), when inserting fixed resistance 24, charged beginning voltage be-4.5kV, and corona discharge begins voltage and is-7.5kV, compares when not inserting fixed resistance 24, and its size is all shifted to high-voltage side.This is because because fixed resistance 24 produces voltage decline, the size that charged beginning voltage and corona discharge begin voltage becomes the part that big this voltage descends.And in experiment 2, electric current substantially flows, and in this experiment, small amount of current flows in gate electrode 26, photosensitive drums 1, so the influence that the voltage that causes of fixed resistance 24 descends occurs.
And, shown in Figure 11 (a) and Figure 11 (b), to compare with the amount of movement of charged beginning voltage (insert when not inserting fixed resistance 24 poor), the amount of movement that corona discharge begins voltage is bigger.Consequently, only by the 1.0kV of the electrifiable scope that applies voltage of ion when not inserting fixed resistance 24 (3.75kV≤| compare during Va|＜4.75kV=, broaden when inserting fixed resistance 24 into 3.25kV (4.5kV≤| Va|＜7.75kV).
This be because, shown in Figure 11 (a) and Figure 11 (b), only total current It big or small less (number μ A) during ion, therefore the voltage that causes of fixed resistance 24 descend less (hundreds of V), but follow anxious increase (the tens of μ A) of size of the total current It of corona discharge, the voltage that fixed resistance 24 causes descends and becomes big (number kV).
(experiment 5)
Then utilize above-mentioned experimental provision shown in Figure 8, investigation be applied to negative ion producing component 20a to apply the gap g that voltage Va, ion produce pin 21 and photosensitive drums 1 be parameter, the only condition that produces of ion and the condition of following corona discharge.Experiment condition is, is applied to applying voltage and being-700V of gate electrode 26, to inserting and two kinds of situations when not inserting fixed resistance 24 experimentize respectively.
Figure 12 (a) is when representing not insert fixed resistance 24, Figure 12 (b) is the chart of the measurement result of expression when having inserted fixed resistance.
In Figure 12 (a), Figure 12 (b), " corona discharge begins " relation that applies voltage Va and gap g when curve representation begins corona discharge.That is, the corona discharge of each gap g of " corona discharge begins " curve representation begins voltage, changes an angle, represents that also the corona discharge that respectively applies voltage Va begins distance.
Equally, in Figure 12 (a), Figure 12 (b), the relation that applies voltage Va and gap g during charged beginning of " charged beginning " curve representation photosensitive drums 1.That is, the charged beginning voltage of each gap g of " charged beginning " curve representation, also expression respectively applies the charged beginning distance of voltage Va.
The region representation of this " corona discharge begins " curve of quilt and " charged beginning " curve clamping does not have corona discharge only to produce ion and can make the charged condition that applies voltage Va and gap g of photosensitive drums 1 reality by ion, below this zone is called suitable application region.
And in Figure 12 (a), Figure 12 (b), " ion produces beginning " straight line represents that ion produces the relation that applies voltage Va and gap g when beginning, and from this figure as can be known, ion produces beginning voltage and do not depend on gap g, keeps certain.
Shown in Figure 12 (a) and Figure 12 (b), gap g is during less than 4mm, only do not exist by the electrifiable voltage regime (difference that charged beginning voltage and corona discharge begin voltage does not exist substantially) that applies of ion, increase when applying voltage big or small, be transformed into corona discharge at once.And, be more than the 4mm by making gap g, only can exist by the voltage regime that applies of ion live-wire, gap g is big more, and only electrifiable to apply voltage regime (suitable application region) big more by ion.And, to compare when not inserting fixed resistance 24, the suitable application region during insertion is bigger.
From this experimental result as can be known, do not produce corona discharge and undertaken to guarantee at least that gap g is more than the 4mm when charged by ion.And according to the result (with reference to Fig. 7) of above-mentioned experiment 1, the negative ion amount (density) of arrival photosensitive drums 1 becomes big along with gap g and reduces, when gap g surpasses 25mm, below half when becoming gap g=5mm.Therefore, in order to make photosensitive drums 1 grade suitably charged by charged thing, preferred gap g is more than the 4mm, below the 25mm.
And the Charging system that uses the existing corona discharge mode of above-mentioned document 4 disclosed needle electrodes is by making gap g reduce the mode of discharge current to get off as 4mm, therefore do not have the voltage regime that applies that only produces ion, certainly leading to corona discharge.Therefore, the reduction effect of the ozone generating amount under the technology of document 4 is compared very little with the present invention.
(experiment 6)
Then, utilize Charging system 2 before Fig. 3 and the primary transfer shown in Figure 4 (latent image with Charging system 4) to make the surface potential of the photosensitive drums 1 of gap g when 3mm changes to 30mm and the experiments of measuring of ozone amount.And, when radome 23 being set and not being provided with, experimentize.Its measurement result of table 3 expression.The survey instrument of surface potential and ozone amount, measuring method with above-mentioned respectively test identical.
(table 3)
Gap g Apply voltage Grid voltage Radome Surface potential Ozone amount
Comparative example 1-1 3mm -4kV -900V Do not have -600V 0.09ppm
Embodiment 1-1 4mm -4kV -900V Do not have -605V 0.002ppm
Embodiment 1-2 10mm -6.5kV -900V Do not have -602V 0.001ppm
Embodiment 1-3 25mm -12kV -900V Do not have -600V 0ppm
Embodiment 1-4 30mm -15kV -900V Have -595V 0ppm
Comparative example 1-2 30mm -15kV -900V Do not have -425V 0ppm
As shown in table 3, during the g=3mm of gap (comparative example 1-1), the generation of ozone is 0.09ppm, and is very many.Relative with it, be that (embodiment 1-1～1-4), the ozone generating amount is below the 0.002ppm, and is considerably less more than the 4mm by making gap g.This be because, gap g is 3mm when following, does not only exist to make the charged condition of photoreceptor by ion, becomes charged that corona discharge causes, and is relative with it, when gap g is 4mm when above, existence only makes the charged condition of photosensitive drums 1 by ion.
And, when not having radome, (embodiment 1-1～1-3), can make the surface potential of photosensitive drums 1 charged in the scope of 4mm≤g≤25mm to desired value-600V.This moment apply voltage Va be 4kV≤| Va|≤12kV.And under the condition of gap g=30mm (comparative example 1-2), bring up to 15kV even will apply voltage swing, the surface potential of photosensitive drums 1 only can reach-425V, less than target-600V.This is because owing to gap g becomes big, the negative ion diffusion arrives the density decline of photosensitive drums 1.
On the other hand, when radome 23 is set (embodiment 1-4), during the g=30mm of gap, when applying voltage 15kV, can make photosensitive drums 1 charged according to target substantially.This be because, suppressed the diffusion of negative ion by radome 23, near the negative ion density the photosensitive drums 1 rises, the utilization ratio of negative ion improves.
(experiment 7)
Then, the toner chargeding performance of Charging system 3 before the investigation secondary transfer printing.
Experimental technique is, the ion that is applied to Charging system 3 before the secondary transfer printing is produced voltage swing interim raising in the scope that is not transformed into corona discharge of pin 21, simultaneously the toner image on the middle transfer belt 15 is carried out charged, measure the current Ib that flows on the intermediate transfer belt 15 of this moment, and charged after the carried charge of toner.And toner image uses the toner adhesion amount to be 0.55mg/cm 2Real image.Figure 13 represents this experimental result.
As shown in figure 13, do not apply at Charging system before secondary transfer printing 3 under the original state of voltage, Ib=0, and the carried charge of toner image is-12.8 μ C/g.Afterwards, along with the increase of the absolute value that applies voltage Va, the generation of negative ion increases, so the absolute value of the carried charge of Ib, toner image also increases.But the carried charge of toner image becomes 30 μ A when above at the absolute value of Ib, and is roughly saturated at-19 μ C/g.
From this result as can be known, voltage control division 31 is controlled, and the voltage Va on the ion generation pin 21 that is applied to high-voltage power supply 25 is reached | Ib| 〉=30, thus make the carried charge of toner image stable at-19 μ C/g, even do not set gate electrode 26 especially, also can make the carried charge equalization of toner image.
Therefore, voltage control division 31 monitoring Ib, for being-30 μ A, apply voltage Va by FEEDBACK CONTROL high-voltage power supply 25, thereby be attached to because of foreign matter leading section that ion produces pin 21, changes in environmental conditions, and image processing system 100 in wind direction variation etc., when the ratio of the ion arrival toner image of negative ion generation, generation etc. changes, also can always an amount of negative ion be provided to toner image.
(experiment 8)
Then, toner image to six kinds of different conditions of difference such as picture pattern, environmental baseline, utilize FEEDBACK CONTROL by voltage control division 31, control applies voltage Va so that Ib is the preceding Charging system 3 of the secondary transfer printing of-30 μ A, it is preceding charged to carry out secondary transfer printing, measures the carried charge of each toner image of charged front and back.Its result as shown in figure 14.
As shown in figure 14, before carrying out secondary transfer printing charged before, the carried charge of the toner image that fluctuates in the scope of about 3 μ C/g of-12～-15 μ C/g focuses on after charged in the scope of about 1 μ C/g of-18～-19 μ C/g.
Therefore, can reach a conclusion, the preceding Charging system 3 of secondary transfer printing with the voltage control division 31 that carries out above-mentioned FEEDBACK CONTROL is effective.
(experiment 9)
Then, to utilize Charging system 3 before the secondary transfer printing carry out before the secondary transfer printing when charged, and secondary transfer printing efficient when not carrying out compare.Figure 15 represents its result.
As shown in figure 15, charged by carrying out before the secondary transfer printing, transfer efficiency improves 5～10%, and also becomes big with respect to the amplitude (transfer printing allowance) of secondary transfer printing electric current.This has shown the preceding charged validity of secondary transfer printing of the preceding Charging system 3 of secondary transfer printing.
As above above-mentioned, Charging system 2, the preceding Charging system 3 of secondary transfer printing, latent image do not follow corona discharge ground to produce negative ion with Charging system 4 before the primary transfer of present embodiment, therefore can prevent the generation of the variety of issue that corona discharge causes, can carry out the charged of photosensitive drums 1, or carry out the pre-transferring charged of the toner image that forms on the surface of photosensitive drums 1, intermediate transfer belt 15.
And the concrete numerical value shown in the present embodiment only is an example, the invention is not restricted to these values.
For example, being applied to the size that applies voltage that ion produces the high-voltage power supply (first voltage applying unit) 25 of pin (the charged electrode of use) 21 is that ion produces more than the size of beginning voltage and gets final product less than the size that corona discharge begins voltage.So, produce pin 21 by ion and produce ion, therefore can make charged by charged thing.And,, therefore can solve the variety of issue that corona discharge causes owing to do not produce corona discharge.
And, " ion produces beginning voltage " is meant, produce at distance son and to apply voltage (shown in the chart of Fig. 6 when beginning to detect ion (number of ions begins to change) when the measuring ion device AIC-2000 that utilizes assistant rattan Itochu to make on the position of front end 150mm of pin (the charged electrode of use) 21 measures, improve when applying voltage the voltage when the measuring ion amount of ion measurement device rises).And, in this manual, " corona discharge begins voltage " be meant, under the condition of a certain gap g (ion produce the front end of pin 21 and by the interval of charged thing), at the front end that produces pin 21 from ion towards the voltage minimum the voltage that applies that can be caused corona discharge by charged thing.
And the above-mentioned size that applies voltage is preferably more than the size of the charged beginning voltage shown in Figure 12 (a), Figure 12 (b).Thus, can make conduct charged by the photosensitive drums 1 of charged thing, toner image reality.
And " charged beginning voltage " is meant under the condition of a certain gap g, and the ion that produces pin 21 generations by ion can make photosensitive drums 1, toner image etc. by the actual voltage that applies minimum in the voltage that changes of the carried charge of charged thing.
Further, the above-mentioned size that applies voltage preferably makes conduct by the saturated size of the carried charge of the toner image of charged thing as testing shown in 7.Thus, even produce unevenly in the generation of ion, the carried charge of the toner image after charged also becomes on average, can carry out proper transfer.Further, owing to can omit gate electrode, so ion need not be recovered to gate electrode, can improve the service efficiency of ion, and can suppress manufacturing cost.
On the other hand, be conceived to gap g, as long as gap g begins distance greater than corona discharge.Thus, corona discharge can be do not produced, therefore the variety of issue that corona discharge causes can be solved.
In addition, " corona discharge begin distance " be meant a certain and apply under voltage (being applied to the voltage that ion produces the front end of the pin 21) condition, and the ion that can produce corona discharge produces the front end of pin 21 and by distance maximum in the distance between the charged thing (gap).
Further, gap g is preferably below the charged beginning distance shown in Figure 12 (a), Figure 12 (b).Thus, can make conduct actual charged by the photosensitive drums 1 of charged thing, intermediate transfer belt 15.
And, " charged beginning distance " be meant a certain and apply under the voltage conditions, produce by ion ion that pin 21 produced can make photosensitive drums 1, toner image etc. by the carried charge actual change of charged thing, ion produce the front end of pin 21 and by the distance between the charged thing (gap) in the distance of maximum.
In addition, gap g is preferably more than the 4mm, below the 25mm specifically.Gap g is 4mm when above, as tests shown in 5, exists not carry out corona discharge and can carry out the ionogenic voltage regime that applies.And if gap g is below the 25mm, then as testing shown in 1, therefore the arrival over half that can make the negative ion that is produced by ion generation pin 21 can effectively be carried out charged by charged thing.
And, in the present embodiment, with electrode be used for to this chargedly, insert fixed resistance (resistor) 24 with between the high-voltage power supply (voltage applying unit) 25 of electrode application voltage charged.By insertion fixed resistance 24, as test shown in 5, can enlarge and not follow discharge only to make by the charged scope that applies voltage and gap (suitable application region) of charged thing, can make ion stabilized emitting by ion.And this fixed resistance 24 is not necessarily leaveed no choice but insert, and also can omit.And the resistance value of fixed resistance 24 is not particularly limited, and suitably sets so that expansion is not followed discharge, only made by the charged scope that applies voltage and gap of charged thing by ion, and ion stabilized emitting got final product.
And, in the present embodiment, produce the radome (ions diffusion limiting part) 23 that is provided for preventing ions diffusion on every side of pin (the charged electrode of using) 21 at ion.By produce to ion pin 21 apply ion that voltage produces along line of electric force to by charged thing side shifting, but compare with the Charging system of existing corona discharge mode, the electric field that forms a little less than, therefore be not all to be released to by charged thing side, also exist to by the ion of the different direction diffusion of charged thing.Therefore,, can prevent ions diffusion, improve the utilization ratio of ion, but the parts of inhibition zone electric installation periphery be unnecessarily charged simultaneously by around ion generation pin 21, radome 23 being set.
And, in the present embodiment, as the charged electrode (ion produces pin 21) that uses needle-like with electrode.Therefore, compare when using wire or zigzag electrode as sparking electrode, can low-voltage form high electric field with existing general corona discharge Charging system.Thus, produce a large amount of ions by begin the little voltage that applies of voltage than corona discharge.
And in the present embodiment, as charged with electrode as shown in Figures 3 and 4, use the needle-like ion of leading section point to produce pin 21, but the invention is not restricted to this.
For example, also can use the tip-shape electrode of leading section points such as coniform (taper), pyramidal, truncated cone, pyramid shape.These have in the electrode of pointed shape, and effect has diameter (or sectional area) than the root of macrobending moment greater than leading section, therefore can improve mechanical strength of electrodes.And, therefore because front end point (radius-of-curvature of front end is little), can low-voltage increase near the electric field intensity the front end, effectively produce ion.And, can make electrode holding components (or electrode root) become big to the distance of front end, therefore can prevent from the decline of the charged characteristic that the electrical interference of self-electrode holding components (or electrode root) causes.
And, also can use electrode (sawtooth electrode) with zigzag fashion (pointed shape).In this case, therefore the same when using electrode such as needle-like, coniform, pyramidal, truncated cone, pyramid halfpace because the fore-end of sawtooth point, can form high electric field by low-voltage.And needle-like, coniform, pyramidal, truncated cone, pyramid shape etc. compares with the sawtooth electrode, and the radius-of-curvature of front end is easy to diminish, and is easy to form high electric field by low-voltage.And, when using the sawtooth electrode, can process the machined electrode shape by lithography process, electroforming, therefore can improve processability.And, by the electrode that uses the sawtooth electrode can realize having good mechanical strength.
And, for example as shown in figure 16, also can use the charged of wire (superfine wire) with electrode (wire electrode 21b).And, structure shown in Figure 16 except charged with the electrode and Fig. 3 and structure shown in Figure 4 roughly the same, therefore omit its explanation.
In the structure of Figure 16, a plurality of (being 32 here) wire electrode 21b is disposed with predetermined spacing p on the substrate 22 of metallic (being stainless steel here).Wire electrode 21b is made of tungsten line or the stainless steel wire of diameter 70 μ m, and the front end of each wire electrode 21b is towards the direction of photosensitive drums 1, and the spacing p between each wire electrode 21b is 10mm.And the voltage Va that applies of high-voltage power supply 25 is-6.5kV.
Like this, under the situation of using wire electrode 21b, produce pin 21 with Fig. 3 and ion shown in Figure 4 and compare, it is slightly poor that ion produces efficient, but can generate negative ion.And, that uses wire is charged when using electrode, charged the same with needle-like, coniform, pyramidal, truncated cone, pyramid shape etc. with electrode, can enlarge the distance from electrode holding components (or root) to the electrode front end, the charged characteristic that therefore can prevent from the electrical interference of self-electrode holding components (or root) to cause descends.And, to compare with wire electrode, the front end of electrodes such as needle-like, coniform, pyramidal, truncated cone, pyramid shape is point (radius-of-curvature of front end is little), therefore can form high electric field by low-voltage, effectively produces ion.And the charged of the wire that wire electrode 21b is such compared with electrode with electrode and needle-like, coniform, pyramidal, truncated cone, pyramid shape etc. are charged, and processing is easier to, and has the advantage that can make at a low price.
Compare with electrode but needle electrode and needle-like, coniform, pyramidal, truncated cone, pyramid shape, taper etc. are charged, be difficult to guarantee physical strength.And; in wire electrode; in order to ensure physical strength when enlarged diameter or sectional area; point diameter or sectional area increase; electric field intensity diminishes; therefore and needle-like, coniform, pyramidal, truncated cone, pyramid shape, taper etc. are charged compares with electrode, the voltage that applies that is used to produce ion is easy to become greatly.
And, also can use electrodes such as cylindric (from roots to the front sectional area different the stacked shape of cylindric part) cylindric, bar-shaped, the band ladder, also can obtain and use the essentially identical effect of wire electrode when using these electrodes.
And that also can use the brush shape is charged with electrode, the charged electrode of using of many boundlings of parts formation of fibrous (for example needle-like, wire) soon.Figure 17 has been to use the charged outboard profile of using the Charging system 2,3,4 of electrode (brush electrode 21c) of brush shape.And, with the electrode, be and Fig. 3 and the roughly the same structure of structure shown in Figure 4 therefore to omit its explanation except charged.
In the structure of Figure 17, brush electrode 21c is configured on the base station 22 of metallic (being aluminum here).Brush electrode 21c is about 15 formation of stainless steel fibre boundling of 12 μ m with diameter, in the structure of Figure 17, will be disposed with predetermined spacing p by a plurality of brush electrode 21c that above-mentioned boundling constitutes.And in the structure of Figure 17, the spacing p between each brush electrode 21c is 1.6mm.And the front end of each brush electrode 21b (constituting the fibrous member of each brush electrode 21b) is towards the direction of photosensitive drums 1.And the voltage Va that applies of high tension voltage 25 is-9kV.
Like this, when using brush electrode 21c, compare,, can generate negative ion though ion generation efficient is slightly poor with Fig. 3 and ion generation pin 21 shown in Figure 4.And the charged electricity consumption of the wire of brush electrode 21c has the charged advantage that can make at a low price with electrode than needle-like.
And, above-mentioned needle-like is charged to be compared with electrode (wire electrode 21b) time with the charged of electrode (ion generation pin 21), wire with using, the number of fiber (ion produce pin or superfine wire) that constitutes each brush electrode 21c is very many, therefore can reduce the charged charged inequality that causes with the spacing of electrode.And, when foreign matters such as dust are attached to the front end of brush electrode 21c, also can reduce charged inhomogeneity influence.
And in the present embodiment, the ion that will be made of tungsten produces pin 21 as the charged electrode of using, but charged material with electrode is not limited thereto.For example also can use other metal materials such as stainless steel.
In addition, as utilizing low-voltage to produce the material of a large amount of ions, known have nano-carbon materials such as CNT, but owing to following reason, compare preferred use tungsten, stainless steel and other metal materials with nano-carbon material.
The 1st problem is: the carbon nanomaterial permanance is extremely low, has the practical problem that is not suitable for.That is to say, under the situation that carbon nanomaterial is used as electrode material, applying when being used for making the voltage that ion produces in atmosphere, compare with tungsten and stainless steel and other metal materials, spending rate is exceedingly fast, owing to need the frequent electrode of changing, thereby and it is impracticable.
The 2nd problem is: extremely trickle because the fibre diameter of carbon nanomaterial only has 1nm～tens of nm, even thereby have the dust that adheres to trace, oil film, moisture film etc., also can be buried by these attachments, can't keep the problem of stable charged action.Especially in making electro-photography apparatus by under the charged situation of charged thing, owing to there are the dust such as hydrophobization surface conditioning agent, paraffin composition, the toner that disperses of the hydrophobized silica that adds in silicone oil from photographic fixing portion, the toner in the electro-photography apparatus, these dust are easy to be attached to by Electrostatic Absorption etc. charged with on the electrode.In addition, often owing to condense from the water vapor of recording chart etc., moisture film is attached to the carbon nanomaterial surface during photographic fixing, or is attached to the carbon nanomaterial surface from the oil film of exercises parts etc.In contrast, under the situation of using electrode materials such as stainless steel and tungsten,, the allowance of this attachment also is far longer than carbon nanomaterial even because of adhering to of dust, oil film, moisture film etc. charged characteristic more or less being descended.
The 3rd problem is: compare with tungsten and stainless steel and other metal materials, there is the high problem of difficulty of processing in carbon nanomaterial.When therefore being difficult to as use tungsten and stainless steel and other metal materials, be processed into shapes such as above-mentioned needle-like, cone shape, pyramid shape, truncated cone shape, pyramid shape, zigzag fashion, wire, drum, bar-shaped, ladder barrel shape, brush shape, can't obtain above-mentioned various effect.In addition, under the situation of using carbon nanomaterial, be difficult to guarantee that carbon nanomaterial bonds to the bonding strength appropriateness on the support member, be difficult to make whole charging zone uniform charged.
Therefore,, compare, preferably use tungsten and stainless steel and other metal materials with carbon nanomaterial as charged material with electrode.
(embodiment 2)
Other embodiments of the present invention are described.And for convenience of explanation, be marked with identical mark to having, and omit its explanation with the parts of embodiment 1 identical function.
Present embodiment is to understand of the present inventionly from the angle that is different from embodiment 1, and the Charging system 2,3,4 in the structure of the Charging system that present embodiment relates to and the embodiment 1 has same structure.And the shape of each parts that Charging system has (for example ion produce pin 21 etc.), material etc. also can be the distortion identical with embodiment 1.
Be with the difference of embodiment 1, be applied to the regulation that ion produces the voltage range of pin 21.That is, in embodiment 1, produce pin 21 to ion and apply the voltage that begins voltage more than the ion generation beginning voltage, less than corona discharge.Relative with it, in the present embodiment, to ion produce pin 21 apply ion produce more than the beginning voltage, less than the voltage of the anxious increase of ozone beginning voltage (the ozone generating amount begins the anxious voltage that increases), or apply ion produce beginning voltage above, less than the voltage of the anxious increase of total current beginning voltage (the anxious voltage that increases of total current (flowing through the electric current that ion produces pin 21) beginning).
Wherein, when not inserting fixed resistance 24 (ion produce the resistance value of the fixed resistance 24 that inserts between pin 21 and the high-voltage power supply 25 little to can ignore it influencing of voltage begun in anxious increase to ozone the time (for example, when N ion produced resistor 24 of pin 21 insertions, resistance value R is during less than 50/N (M Ω))), voltage of anxious increase beginning of ozone is meant: will be applied to ion and produce when the size that applies voltage of pin 21 is each to increase predetermined value (for example 500V), at first detecting the applying more than the voltage (ozone generating begins voltage) of ozone, ozone generating begins voltage applying in the voltage range below 2 times, applies voltage when becoming maximum with respect to the rate of change of the ratio of the recruitment of the ozone generating amount (detection limit) of the recruitment of the size that applies voltage of above-mentioned measurement point.And the above-mentioned rate of change that ozone generating begins in the voltage is beginning the mean value that applies rate of change voltage range in of voltage below 2 times with respect to begin voltage and ozone generating greater than ozone generating, be more than 2 times the time, this ozone generating is not begun voltage as the anxious increase of ozone beginning voltage, will apply voltage as the anxious increase of ozone beginning voltage than what ozone generating began the big above-mentioned predetermined value of voltage.And, ozone generating begins above-mentioned rate of change in the voltage with respect to the mean value that begins voltage and the above-mentioned rate of change in ozone generating begins the voltage range of voltage below 2 times greater than ozone generating, for less than 2 times the time, voltage of anxious increase beginning of ozone equals ozone generating and begins voltage.
And, when not inserting fixed resistance 24 (ion produce the resistance value of the fixed resistance 24 that inserts between pin 21 and the high-voltage power supply 25 little to can ignore it influencing of voltage begun in anxious increase to ozone the time (for example, when N ion produced resistor 24 of pin 21 insertions, resistance value R is during less than 50/N (M Ω))), voltage of anxious increase beginning of total current is: will be applied to ion and produce when the size that applies voltage of pin 21 is each to increase predetermined value (for example 500V), at first detecting the applying more than the voltage (electric current produce beginning voltage) of total current, electric current produces the applying in the voltage range below 2 times of the size of beginning voltage, applies voltage with respect to the rate of change of the ratio of the recruitment of the total current of the recruitment of the size that applies voltage of above-mentioned measurement point when maximum.And the above-mentioned rate of change in the electric current generation beginning voltage is with respect to producing beginning voltage greater than electric current and producing the mean value that applies the rate of change in the voltage range below 2 times that begins voltage at electric current, be more than 2 times the time, this electric current generation is not begun voltage and suddenly establish beginning voltage newly, will produce the voltage that applies that begins the big above-mentioned predetermined value of voltage than electric current and suddenly establish the voltage that begins newly as total current as total current.And, above-mentioned rate of change in the electric current generation beginning voltage is with respect to the mean value that produces beginning voltage and the above-mentioned rate of change in electric current produces the voltage range below 2 times that begins voltage greater than electric current, for less than 2 times the time, voltage of anxious increase beginning of total current equals electric current and produces beginning voltage.
On the other hand, when having inserted fixed resistance 24 (resistance value that ion produces the fixed resistance 24 that inserts between pin 21 and the high-voltage power supply 25 be in the time of can't ignoring it to the value of the influence of the anxious increase of ozone beginning voltage (for example, when N ion produced resistor 24 of pin 21 insertions, when resistance value R is 50/N (M Ω)≤R≤2000/N when (M Ω))), voltage of anxious increase beginning of ozone is meant: will be applied to ion and produce when the size that applies voltage of pin 21 is each to increase predetermined value (for example 500V), applying voltage (ozone generating begins voltage) greater than what at first detect ozone, begin the applying in the voltage range below 2 times of voltage in ozone generating, apply voltage when maximum with respect to the rate of change of the ratio of the recruitment of the ozone generating amount (detection limit) of the recruitment of the size that applies voltage of above-mentioned measurement point.
And, when having inserted fixed resistance 24 (resistance value that ion produces the fixed resistance 24 that inserts between pin 21 and the high-voltage power supply 25 be in the time of can't ignoring it to the value of the influence of the anxious increase of ozone beginning voltage (for example, when N ion produced resistor 24 of pin 21 insertions, when the resistance value R of this resistance 24 is 50/N (M Ω)≤R≤2000/N when (M Ω))), voltage of anxious increase beginning of total current is meant: be applied to ion and produce when the size that applies voltage of pin 21 is each to increase predetermined value (for example 500V), applying voltage (electric current produce beginning voltage) greater than what at first detect total current, the applying in the voltage range below 2 times that produces the beginning voltage swing at electric current applies voltage when maximum with respect to the rate of change of the ratio of the recruitment of the total current (detection limit) of the recruitment of the size that applies voltage of above-mentioned measurement point.
In addition, when the value that respectively applies the ozone generating amount of voltage and total current has fluctuation, take multiple measurements (preferred more than 16 times), get its mean value.
Then, describe with reference to experimental result to produce the effect that voltage is as above stipulated that applies of pin 21 with respect to ion.And the experimental result of experiment 1 to 9 shown below is experimental results identical with the experiment 1 to 9 shown in the embodiment 1, just from different angles it is observed.
(experiment 1)
At first, prepare negative ion producing component 20a shown in Figure 5.
Negative ion generating device 20a is fixed to by the ion generation pin 21 with many (being 3 herein) needle-likes on the substrate 22 of metallic (herein for stainless steel) and constitutes.Ion generation pin 21 is that the cone angle of 1mm, conus portion is that the radius-of-curvature on 34 degree, conus portion top is that the tungsten of 15 μ m (purity 99.999%) constitutes by diameter, and the spacing between each ion generation pin 21 is set at 10mm.
With this negative ion generating device 20a be arranged on every side 1 meter square in except air suction inlet described later in the space without any thing (open state), negative ion generating device 21a is connected under the situation of negative terminal side of high-voltage power supply 25, and be under the situation of the fixed resistance 24 of the 200M Ω negative terminal side that is connected to high-voltage power supply 25, to measure negative ion generation, ozone generating amount and the magnitude of current of this moment when applying voltage via resistance with negative ion generating device 20a.That is to say, be that two kinds of situations of the fixed resistance 24 of 200M Ω are tested for insert and do not insert resistance between negative ion generating device 20a and high-voltage power supply 25.As high-voltage power supply 25, use be the MODEL610C that makes of Trek society, that use as the negative ion analyzer is the AIC-2000 that makes of assistant Teng Shangshishe, that use as the ozone analyzer is the ozone monitor EG2002F that weak former industry society makes.And, apply the ion generation of voltage after 5 seconds for measuring beginning on the position of 150mm to ion generation pin 21 at distance ion generation pin 21 for negative ion.In addition, for ozone amount, on the position of 10mm air suction inlet is set at distance ion generation pin 21, beginning is after ion generation pin 21 applies voltage, to be 15 seconds in 1 mensuration cycle, obtain the mean value of 12 cycles (15 seconds * 12=180 second (=3 minutes)), measure thus.
Fig. 6 (a) is the experimental result when not inserting fixed resistance 24, and Fig. 6 (b) is the chart of the experimental result when inserting fixed resistance 24.
Shown in Fig. 6 (a), under the situation of not inserting fixed resistance 24, apply voltage and begin to produce negative ion (measured value of negative ion begins to rise) from-2.5kV.In addition, shown in Fig. 6 (b), be inserted with under the situation of fixed resistance 24, apply voltage and begin to produce negative ion from-2kV.In addition, no matter under the situation of not inserting or insert fixed resistance 24, apply voltage and rise (absolute value that applies voltage increases), and negative ion amount (ion generation) sharply increases, roughly 1 * 10 7Individual/saturated during cc.In addition, no matter under the situation of not inserting or insert fixed resistance 24, all produce ozone hardly, compare with used corona discharge mode Charging system, the ozone generating amount reduces significantly.
From this result as can be known, if apply high voltage to the needle-like negative ion generating device 20a of Fig. 5 under the state of the object that do not discharge around, then can produce ozone ground (promptly under the state that the ozone generating amount is reduced significantly) hardly and generate negative ion in a large number.
And compare when not inserting fixed resistance 24, the low some reasons of negative ion generation starting potential can think that the generation of ion is imaginary positive electrode with atmosphere during insertion, utilize the potential difference (PD) between atmosphere and the ion generation pin 21 to produce, but because this atmosphere impedance is extremely unstable, under the situation that does not have fixed resistance 24, applying voltage and can begin to produce in the zone of ion with very low, the generation instability of ion, relative with it, if insert fixed resistance 24, owing to comprise that the resulting impedance of atmosphere impedance is stable, thereby the generation of ion itself is also stable.
Then, insert fixed resistance 24, will apply voltage and be made as-3kV, measure apart from the distance L of ion generation pin 21 and the relation between the negative ion amount (density).Fig. 7 is this result's of expression a chart, is that the negative ion amount during with L=5mm is made as 100%, the negative ion amount when L＞5mm relatively is shown.
As shown in the drawing, the density of the big more negative ion of L is more little.In addition, as shown in Figure 7 as can be known, if the negative ion amount (density) more than 50% then with respect to the locational negative ion amount (density) of L=5mm, can be guaranteed in the position of L≤25mm.
(experiment 2)
Then, measure the charged characteristic of the photosensitive drums 1 that adopts above-mentioned negative ion generating device 20a by experiment.At first use Fig. 8 illustrative experiment device.
For by the photosensitive drums 1 (photosensitive drums of use in the color copy machine (ProductName MX-2300) that Sharp makes) that can rotate Organophotoreceptor (OPC) formation of the diameter 30mm, the thickness 30 μ m that support with any rotating speed, on the position of specified gap g, disposing negative ion generating device 20a.And photosensitive drums 1 and negative ion generating device 20a are positioned at the propylene system seal casinghousing that central mode is configured in long 80cm * wide 40cm * high 25cm with negative ion generating device 20a.In addition, can change on the base station (not shown) of position on the photoreceptor direction, gap g can be set arbitrarily in the scope of 0～30mm by negative ion generating device 20a is configured in.In addition, measure the electric current (total current) that flows through among the negative ion generating device 20a with galvanometer A1.
In addition, having disposed by thickness between the ion generation pin 21 of negative ion generating device 20a and photosensitive drums 1 is the gate electrode 26 that constitutes of the stainless steel of 0.1mm (being the gate electrode that uses among the AR-625S that makes of Sharp, the width w=26mm of peristome).And the fixed interval between gate electrode 26 and the photosensitive drums 1 is on 1.5mm.Gate electrode 26 is connected with the negative terminal of high-voltage power supply 27, can apply free voltage.In addition, measure the electric current (grid current) that flows through in the gate electrode 26 with galvanometer A2.
And on the position of the position relative with negative ion generating device 20a by photosensitive drums 1 with respect to 90 ° in the sense of rotation downstream of this photosensitive drums 1, configuration surface pot probe 30 is to measure the surface potential of photosensitive drums 1.In addition, surface potential meter probe 30 is arranged on the base station (not shown) of the length direction that can scan photosensitive drums 1, not only can measure the circumferencial direction of photosensitive drums 1, but also the surface potential on the measured length direction distributes.In addition, as the surface potential meter, use be the MODEL344 that TereK society makes, the peripheral speed of photosensitive drums 1 is set at 124mm/s.In addition, adopt the method identical to measure ion generation and ozone generating amount with experiment 1, and with the electric current that flows through in the galvanometer A3 mensuration photosensitive drums 1.
In addition, as experiment condition, be set at gap g=20mm, the voltage that applies that is applied to negative ion generating device 20a is-7.7kV, the voltage that applies that is applied to gate electrode 26 is-900V to test respectively for two kinds of situations inserting and do not insert fixed resistance 24.
Fig. 9 is the chart of this experimental result of expression, illustrate and the length direction of the photosensitive drums 1 when not having gate electrode 26 on the comparative result that distributes of surface potential.Table 4 illustrates the measurement result of negative ion generation and ozone generating amount.In addition, the transverse axis of Fig. 9 represents and the distance of the length direction of photosensitive drums 1 that the longitudinal axis is represented the surface potential of photosensitive drums 1.About with the distance of the length direction of the photosensitive drums 1 of transverse axis, dispose above-mentioned 3 radical ion generation pins 21 along the length direction of photosensitive drums 1, the ion generation pin 21 relative positions of photosensitive drums 1 and central authorities are shown 0.
(table 4)
The negative ion generation (individual/cc) Ozone generating amount (ppm)
Non-grid 18,000,000 0.002
Grid is arranged 18,000,000 0.003
As shown in Figure 9, no matter have or not gate electrode 26, the surface of photosensitive drums 1 is all charged.And as shown in table 4, though negative ion produced sufficient amount (18,000,000/cc), (that is, the generation of ozone is few, is 0.002ppm～0.003ppm) not produce ozone substantially.When producing corona discharge, should produce a large amount of ozone, but in this experiment owing to do not produce ozone (the ozone generating amount seldom) substantially, so as can be known, in this experiment to the charged generation effect of photosensitive drums 1 be not corona discharge, but negative ion.That is, can make photosensitive drums 1 fully charged by negative ion as can be known.
And, as shown in Figure 9, when gate electrode 26 not being set, the position according to three radical ions produce pin 21 produces fluctuation (three peak values) on surface potential, and when gate electrode 26 is set, therefore this minimizing of fluctuating has been verified, by gate electrode 26 is set, can suppress the fluctuation of surface potential, improve the controlled of surface potential.
(experiment 3)
Then measure the charged characteristic of above-mentioned negative ion producing component 20a by experiment to toner image.At first with reference to Figure 10 illustrative experiment device.
As shown in figure 10, experimental provision uses and tests 2 the identical device of device.Just in this experiment 3, do not use surface potential meter probe 30 and galvanometer A3.
The illustrative experiment method at first, is utilized not shown color digital compounding machine (Sharp makes AR-C280), forms not photographic fixing toner image on OHP paper (S4BG746 that Sharp makes).It is the polyester toner (the pure toner of AR-C280) of 8.5 μ m that image forms the toner use particle diameter that uses, and as not photographic fixing toner image, the formation adhesion amount is 0.6mg/cm 2Real image.And, measure the carried charge of the not photographic fixing toner image that forms by aspiration-type mini zone electrical quantity measurement arrangement (Trek company make MODEL210HS-2A).
Then, the above-mentioned same OHP paper that has formed not photographic fixing toner image is pasted photosensitive drums 1 surface, applying under the state of predetermined voltage to negative ion producing component 20a and gate electrode 26, make photosensitive drums 1 with predetermined peripheral speed rotation, make not photographic fixing toner image through the zone relative, thereby carry out the charged of toner image with ion generation pin 21.And, measure the carried charge of toner image, the carried charge of the toner image of more charged front and back after charged once more.And the same with experiment 1, ion generation, ozone generating amount are also measured.
In addition, experiment condition is, gap g=20mm, and the voltage that applies that is applied to negative ion producing component 20a is-7.7kV, is applied to applying voltage and being-900V of gate electrode 26, to inserting and experimentizing respectively when not inserting gate electrode 26.
Table 5 is charts of this experimental result of expression, and expression has and carried charge when not having gate electrode 26, toner image, negative ion generation, and the measurement result of ozone generating amount.
(table 5)
Toner carried charge (μ C/g) The negative ion generation (individual/cc) Ozone generating amount (ppm)
Before charged After charged Recruitment
Non-grid -12.8 -20.5 7.7 18,000,000 0.002
Grid is arranged -12.8 -18.3 5.5 18,000,000 0.003
As shown in table 5, no matter have or not gate electrode 26, the carried charge of toner image all increases.And, though negative ion produce sufficient amount (18,000,000/cc), (that is, the ozone generating amount is few, is 0.002ppm～0.003ppm) not produce ozone substantially.When producing corona discharge, should produce a large amount of ozone, but in this experiment owing to do not produce ozone (the ozone generating amount is few) substantially, so as can be known, in this experiment to the charged generation effect of toner image be not corona discharge, but negative ion.That is, verified by negative ion and can make photosensitive drums 1 fully charged.
And as can be known, compare when having gate electrode, when not having gate electrode, the recruitment of the carried charge of toner is bigger.
(experiment 4)
Below study the condition that more stably produces negative ion by experiment.According to above-mentioned experiment 2 and test 3 result, negative ion has identical tendency to the charged of photosensitive drums 1 with to toner image charged, in this experiment 4, is by charged thing with photosensitive drums 1 therefore.
In this experiment, utilize above-mentioned experimental provision shown in Figure 8, investigation is applied to the surface potential V that applies voltage Va and photosensitive drums 1 of negative ion producing component 20a o, total current It, ozone generating amount relation.Experiment condition is, gap g=10mm, and the fixed interval of gate electrode 26 and photosensitive drums 1 is 1.5mm, to the applying voltage and be-700V of gate electrode 26, to inserting and two kinds of situations when not inserting gate electrode 26 experimentize respectively.In this experiment, make the size that applies voltage begin to increase 500V from 0V at every turn, investigation respectively applies the surface potential V of the photosensitive drums 1 under the voltage o, total current It, ozone generating amount relation.
Figure 11 (a) is the chart of the measurement result when representing not insert fixed resistance 24, the chart of the measurement result when fixed resistance 24 has been inserted in Figure 11 (b) expression.
Shown in Figure 11 (a), when improving gradually when being applied to the size that applies voltage Va (absolute value) of negative ion producing component 20a, at first near-the 3.75kV, the surface of photosensitive drums 1 begins charged (charged beginning voltage), when further raising is big or small, surface potential V oAbsolute value also become big along with applying voltage Va.
Figure 19 (a) is the relation that applies voltage and ozone generating amount shown in expression Figure 11 (a), and with respect to the chart of the rate of change β of the recruitment α of the ozone generating amount of the recruitment that applies voltage.
Wherein, with respect to the increment rate α of the ozone generating amount O of the size that applies voltage V under the measurement point n nBe expressed as: α n=(O n-O N-1)/(| V n|-| V N-1|).And the rate of change β of the increment rate α of measurement point n is expressed as: β n=α N+1/ α nWhen calculating rate of change β, when removing with 0, rate of change β=0.And the value n of measurement point is 0 when applying voltage for 0V, and the size that applies voltage is with each increase 500V.And, increase when applying voltage swing, (ozone generating begins voltage at first to consider the voltage that applies from the measurement point that detects ozone; (be among Figure 19 (a)-apply voltage range till 9.0kV) for-4.5kV) beginning, the voltage that applies that begins 2 times of voltages to ozone generating among Figure 19 (a).
In this manual, when not inserting fixed resistance 24, will be at the above-mentioned measurement point that applies above-mentioned rate of change β maximum in the voltage range apply voltage as " the anxious increase of ozone beginning voltage ".When ozone generating begins rate of change β in the voltage with respect to the size that begins voltage greater than ozone generating and begin the mean value that applies the rate of change β under the voltage range below 2 times of the size of voltage in ozone generating, be more than 2 times the time, will apply voltage as the anxious increase of ozone beginning voltage than what ozone generating began the big above-mentioned predetermined value of voltage.Therefore, voltage of anxious increase beginning of the ozone in this experimental result such as Figure 19 (a) be depicted as-4.5kV and ozone generating begin voltage and equate.
Wherein, if making the size that applies voltage Va that is applied to negative ion producing component 20a is the size (here for 3.75kV) of charged beginning voltage, less than the size (being 4.5kV here) of the anxious increase of ozone beginning voltage, then shown in Figure 19 (a), can suppress the ozone generating amount, and make by charged thing charged by ion.
Figure 19 (b) is the relation that applies voltage and total current shown in expression Figure 11 (a), and with respect to the chart of the rate of change γ of the increment rate θ of the total current of the recruitment that applies voltage.
Wherein, with respect to the increment rate θ of the total current It of the size that applies voltage V under the measurement point m mBe expressed as: θ m=(It m-It M-1)/(| V m|-| V M-1|).And, be expressed as with respect to the rate of change γ of the increment rate θ of the total current It of the size that applies voltage V: γ m=θ M+1/ θ mWhen calculating rate of change γ, when removing with 0, rate of change γ=0.And the value m of measurement point is 0 when applying voltage for 0V, applies the each 500V of increasing of size of voltage.And, increase when applying voltage swing, consider that (electric current produces beginning voltage for the voltage that applies from the measurement point that at first detects total current; Among Figure 19 (b) (among Figure 19 (b) be-apply voltage range till 8.0kV) for-4.0kV) beginning, the voltage that applies that produces 2 times of beginning voltages to electric current.
In this manual, when not inserting fixed resistance 24, will be at the above-mentioned measurement point that applies above-mentioned rate of change γ maximum in the voltage range apply voltage as " the anxious increase of total current beginning voltage ".Rate of change γ in electric current generation beginning voltage is with respect to producing size that begins voltage and the mean value that applies the rate of change γ under the voltage range below 2 times that produces the size that begins voltage at electric current greater than electric current, be more than 2 times the time, will apply voltage as the anxious increase of total current beginning voltage than what electric current produce the big above-mentioned predetermined value of beginning voltage.Therefore, " total current anxious increase beginning voltage " in this experimental result as Figure 19 (b) be depicted as-4.5kV produces beginning voltage with electric current and equates.
Wherein, if make the size that applies voltage Va that is applied to negative ion producing component 20a be the size (here for 3.75kV) of charged beginning voltage above, less than the size (being 4.5kV here) of the anxious increase of total current beginning voltage, then shown in Figure 19 (a), can suppress the ozone generating amount, and make by charged thing charged by ion.
On the other hand, shown in Figure 11 (b), when having inserted fixed resistance 24, charged beginning voltage is-4.5kV, and when further raising applied voltage big or small, the absolute value of surface potential V0 also became big along with applying voltage.
Figure 20 (a) is the relation that applies voltage and ozone generating amount shown in expression Figure 11 (b), and with respect to the chart of the rate of change β of the increment rate α of the ozone generating amount that applies voltage swing.
In this manual, when inserting fixed resistance 24, the above-mentioned rate of change β in the voltage range of applying below 2 times of the size that will begin voltage in the size that begins voltage greater than ozone generating and ozone generating applies voltage as " the anxious increase of ozone beginning voltage " for the measurement point of maximum maximum value.Therefore, shown in Figure 20 (a), voltage of anxious increase beginning of the ozone in this experimental result is-9.0kV.
When having inserted resistance, if make the size that applies voltage Va that is applied to negative ion producing component 20a be the size (here for 4.5kV) of charged beginning voltage above, less than the size (being 9.0kV here) of the anxious increase of ozone beginning voltage, then shown in Figure 20 (a), can suppress the ozone generating amount, and make by charged thing charged by ion.
Figure 20 (b) is the relation that applies voltage and total current shown in expression Figure 11 (b), and with respect to the chart of the rate of change γ of the increment rate θ of the total current of the size that applies voltage.
In this manual, when inserting fixed resistance 24, will apply voltage as " the anxious increase of total current beginning voltage " for the measurement point of maximum maximum value producing the beginning voltage swing greater than electric current and produce above-mentioned rate of change γ in the scope that applies voltage below 2 times of size of beginning voltage less than electric current.Therefore, shown in Figure 20 (b), voltage of anxious increase beginning of the total current in this experimental result is-8.5kV.
If make the size that applies voltage Va that is applied to negative ion producing component 20a be the size (here for 4.5kV) of charged beginning voltage above, less than the size (being 8.5kV here) of the anxious increase of total current beginning voltage, then shown in Figure 20 (a), can suppress the ozone generating amount, and make by charged thing charged by ion.
And, to compare when not inserting fixed resistance 24, when inserting fixed resistance 24, voltage of anxious increase beginning of ozone and voltage of anxious increase beginning of total current all move to high pressure.This is because by fixed resistance 24 generation voltages declines, voltage of anxious increase beginning of charged beginning voltage and ozone and total current are suddenly established beginning voltage newly and uprised this voltage sloping portion.In addition, in experiment 2, do not have electric current to flow substantially, and in this experiment, electric current flow into gate electrode 26, photosensitive drums 1, the influence that 24 pairs of voltages of fixed resistance descend therefore occurred.
And, shown in Figure 11 (a) and Figure 11 (b), to compare with the amount of movement of charged beginning voltage (insert and when not inserting fixed resistance 24 poor), ozone is anxious to be increased voltage and total current urgency to increase the mobile quantitative change of voltage big.Consequently, do not make anxious the increasing of ozone generating amount and electrifiable when applying the scope of voltage and not inserting fixed resistance 24 0.75kV (3.75kV≤| Va|＜4.5kV) compare, when insertion fixed resistance 24, become greatly 4.5kV (4.5kV≤| Va|＜9.0kV).Equally, do not make anxious the increasing of total current and electrifiable when applying the scope of voltage and not inserting fixed resistance 24 0.75kV (3.75kV≤| Va|＜4.5kV) compare, when insertion fixed resistance 24, become greatly 4.0kV (4.5kV≤| Va|＜8.5kV).
This be because, shown in Figure 11 (a) and Figure 11 (b), when applying voltage hour, big or small less (the number μ A) of total current It, therefore the voltage that causes of fixed resistance 24 descend less (hundreds of V), but when applying voltage and become big, anxious increase (the tens of μ A) of total current It, the voltage that fixed resistance 24 causes descend and become big (number kV).
And, to insert and when not inserting fixed resistance 24, the different reason of voltage of anxious increase beginning of ozone and voltage of anxious increase beginning of total current is following above-mentioned.
That is, total current and ozone generating amount are subjected to the bigger influence of electric field intensity between ion generation pin 21 and the photosensitive drums 1.And the voltage that electric field intensity and ion produce effect between pin 21 and the photosensitive drums 1 is directly proportional, and the interval (distance) that ion produces between pin 21 and the photosensitive drums 1 is inversely proportional to.
Wherein, when inserting fixed resistance 24, total current begins to flow to apply voltage 5.5kV, because of ion produces restrictions such as space impedance between pin 21 and the photosensitive drums 1, and the restriction of the process resistance 24 inserted, total current and ozone generating amount and apply voltage and increase (increase of first ratio) with being directly proportional.And, when applying voltage and surpassing the anxious bending point that increases of ozone generating amount, because of the influence of ozone, the space impedance variation, to increase different scale-up factors, to be directly proportional with applying voltage with above-mentioned first ratio, total current and ozone generating amount increase (increase of second ratio).Therefore, rate of change β, the γ of above-mentioned bending point become maximum value.
On the other hand, when not inserting fixed resistance 24, total current is with after applying voltage 4.0kV and beginning to flow, because the voltage that does not exist fixed resistance 24 to cause descends, therefore applying near the voltage 4.0kV, produces the anxious bending point that increases of total current and ozone generating amount.Therefore, first ratio is increased in the experimental result not to be observed, and second ratio of only observing increases.
Therefore, in the present embodiment, ozone generating begins rate of change β in the voltage with respect to beginning voltage greater than ozone generating and beginning the mean value of the above-mentioned rate of change β under the voltage range of voltage below 2 times in ozone generating, be more than 2 times the time, will apply voltage as the anxious increase of ozone beginning voltage than what ozone generating began the big above-mentioned predetermined value of voltage (making the above-mentioned certain value when being applied to voltage that ion produces pin 21 and increasing so that certain value is interim).And, rate of change γ in electric current generation beginning voltage is with respect to producing the mean value that begins voltage and produce the rate of change γ under the voltage range below 2 times that begins voltage at electric current greater than electric current, be more than 2 times the time, will apply voltage as the anxious increase of electric current beginning voltage than what electric current produce the big above-mentioned predetermined value of beginning voltage (making the above-mentioned certain value when being applied to voltage that ion produces pin 21 and increasing so that certain value is interim).
And when not inserting fixed resistance 24, first ratio of also can suitably discerning increases and second ratio increases, and suitably holds under the situation of bending point, the same regulation in the time of also can making voltage of anxious increase beginning of ozone and voltage of anxious increase beginning of electric current and insert fixed resistance 24.For example, by poor (for example 250V is to 1000V) that apply voltage between each measurement point of suitable setting, first ratio of can appropriately discerning increases and second ratio increases.
(experiment 5)
Then, utilize above-mentioned experimental provision shown in Figure 8, investigation is a parameter with the gap g that applies voltage Va, ion generation pin 21 and photosensitive drums 1 that is applied to negative ion producing component 20a, and ozone generating amount and total current are suddenly increased and electrifiable condition.Experiment condition is, is applied to applying voltage and being-700V of gate electrode 26, to inserting and two kinds of situations when not inserting fixed resistance 24 experimentize respectively.
Figure 21 (a) is the chart of the measurement result when representing not insert fixed resistance 24, when fixed resistance has been inserted in Figure 21 (b) expression.
In Figure 21 (a), Figure 21 (b), the relation that apply voltage Va and gap g of " the anxious increase of ozone is begun " (or " anxious increase beginning of total current ") when curve representation ozone generating amount (or total current) beginning suddenly increases.Promptly, the voltage of anxious increase beginning of ozone (or voltage of anxious increase beginning of total current) of " anxious increase beginning of ozone " (or " anxious increase beginning of total current ") each gap g of curve representation, but change an angle, it also represents respectively to apply the distance of anxious increase beginning of ozone (or distance of anxious increase beginning of total current) of voltage Va.
Equally, in Figure 21 (a), Figure 21 (b), the relation between voltage Va and the gap g of applying when " charged beginning " curve representation photosensitive drums 1 beginning is charged.That is, the charged beginning voltage of each gap g of " charged beginning " curve representation, also expression respectively applies the charged beginning distance of voltage Va.
The region representation that quilt is somebody's turn to do " anxious increase beginning of ozone " (or " total current is suddenly established the beginning newly ") curve and " charged beginning " curve clamping does not make the anxious generation ion of ozone generating amount (or total current) with increasing and can make the charged condition that applies voltage Va and gap g of photosensitive drums 1 reality by ion, below this zone is called suitable application region.
And in Figure 21 (a), Figure 21 (b), " ion produces beginning " straight line represents that ion produces the relation that applies voltage Va and gap g when beginning, and from this figure as can be known, ion produces beginning voltage and do not depend on gap g, keeps certain.
Shown in Figure 21 (a) and Figure 21 (b), gap g is during less than 4mm, do not exist ozone generating amount and total current are suddenly increased with regard to the electrifiable voltage regime (difference that charged beginning voltage and corona discharge begin voltage does not exist substantially) that applies, increase when applying voltage big or small, be transformed into corona discharge at once.And, by making gap g is more than the 4mm, can exist not make anxious the increasing of ozone generating amount and total current just can be by the voltage regime that applies of ion live-wire, gap g be big more, and ozone generating amount and total current urgency is just increased can be big more by the voltage regime (suitable application region) that applies of ion live-wire.And, to compare when not inserting fixed resistance 24, the suitable application region during insertion is bigger.
From this experimental result as can be known, do not make anxious the increasing of ozone generating amount and total current and undertaken to guarantee at least that gap g is more than the 4mm when charged by ion.And according to the result (with reference to Fig. 7) of above-mentioned experiment 1, the negative ion amount (density) of arrival photosensitive drums 1 becomes big along with gap g and reduces, when gap g surpasses 25mm, below half when becoming gap g=5mm.Therefore, in order to make photosensitive drums 1 grade suitably charged by charged thing, preferred gap g is more than the 4mm, below the 25mm.
And, the Charging system that uses the existing corona discharge mode of above-mentioned document 4 disclosed needle electrodes is by making gap g reduce the mode of discharge current to get off as 4mm, therefore do not have the voltage regime that applies that mainly only produces ion, the ozone generating amount is anxious when charged increases.Therefore, the reduction effect of the ozone generating amount under the technology of document 4 is compared very little with the present invention.
(experiment 6)
Then, utilize Charging system 2 before Fig. 3 and the primary transfer shown in Figure 4 (latent image with Charging system 4) to make the surface potential of the photosensitive drums 1 of gap g when 3mm changes to 30mm and the experiments of measuring of ozone amount.And, when radome 23 being set and not being provided with, experimentize.The material of radome is the ABS resin of insulativity, floats.Its measurement result of table 6 expression.
The survey instrument of surface potential and ozone amount, measuring method with above-mentioned respectively test identical.
(table 6)
Gap g Apply voltage Grid voltage Radome Surface potential Ozone amount
Comparative example 1-1 3mm -4kV -900V Do not have -600V 0.09ppm
Embodiment 1-1 4mm -4kV -900V Do not have -605V 0.002ppm
Embodiment 1-2 10mm -6.5kV -900V Do not have -602V 0.001ppm
Embodiment 1-3 25mm -12kV -900V Do not have -600V 0ppm
Embodiment 1-4 30mm -15kV -900V Have -595V 0ppm
Comparative example 1-2 30mm -15kV -900V Do not have -425V 0ppm
As shown in table 6, during the g=3mm of gap (comparative example 1-1), the generation of ozone is 0.09ppm, and is very many.Relative with it, be that (embodiment 1-1～1-4), the ozone generating amount is below the 0.002ppm, and is considerably less more than the 4mm by making gap g.This be because, gap g is that 3mm is when following, do not exist and do not make that the ozone generating amount is anxious to be increased and make the charged condition of photoreceptor by ion, become charged that corona discharge causes, relative with it, when gap g is 4mm when above, exist not make anxious the increasing of ozone generating amount and make the charged condition of photosensitive drums 1 by ion.
And, when not having radome, (embodiment 1-1～1-3), can make the surface potential of photosensitive drums 1 charged in the scope of 4mm≤g≤25mm to desired value-600V.This moment apply voltage Va be 4kV≤| Va|≤12kV.And under the condition of gap g=30mm (comparative example 1-2), bring up to 15kV even will apply voltage swing, the surface potential of photosensitive drums 1 only can reach-425V, less than target-600V.This is because owing to gap g becomes big, the negative ion diffusion arrives the density decline of photosensitive drums 1.
On the other hand, when radome 23 is set (embodiment 1-4), during the g=30mm of gap, when applying voltage 15kV, can make photosensitive drums 1 charged according to target substantially.This be because, suppressed the diffusion of negative ion by radome 23, near the negative ion density the photosensitive drums 1 rises, the utilization ratio of negative ion improves.
(experiment 7)
Then investigate the toner chargeding performance of the preceding Charging system 3 of secondary transfer printing.
Experimental technique is, the ion that is applied to Charging system 3 before the secondary transfer printing is produced voltage swing interim raising in the scope that is not transformed into corona discharge of pin 21, simultaneously the toner image on the intermediate transfer belt 15 of the transfer belt of using the color copy machine ARC-280 that Sharp makes is carried out charged, measure the current Ib that flows on the intermediate transfer belt 15 of this moment, and charged after the carried charge of toner.And toner image uses the toner adhesion amount to be 0.55mg/cm 2Real image.Figure 13 represents this experimental result.
As shown in figure 13, do not apply at Charging system before secondary transfer printing 3 under the original state of voltage, Ib=0, and the carried charge of toner image is-12.8 μ C/g.Afterwards, along with increase applies the absolute value of voltage Va, the generation of negative ion increases, so the absolute value of the carried charge of Ib, toner image also increases.But the carried charge of toner image becomes 30 μ A when above at the absolute value of Ib, and is roughly saturated at-19 μ C/g.
From this result as can be known, voltage control division 31 is controlled, and makes the voltage Va of the ion generation pin 21 that is applied to high-voltage power supply 25 be | Ib| 〉=30, thus make the carried charge of toner image stable at-19 μ C/g, even do not set gate electrode 26 especially, also can make the carried charge equalization of toner image.
Therefore, voltage control division 31 makes monitoring Ib when voltage Va is interim to rise that applies of high-voltage power supply 25, try to achieve it and apply voltage Va for the high-voltage power supply 25 of-30 μ A, and be feedback controlled to the high-voltage power supply 25 that becomes-30 μ A apply voltage Va, thereby be attached to because of foreign matter leading section that ion produces pin 21, changes in environmental conditions, and image processing system 100 in wind direction variation etc., when the ratio of the ion arrival toner image of negative ion generation, generation etc. changes, also can always an amount of negative ion be provided to toner image.
In addition,, can provide-30 μ A, also can provide-30 μ A from the high-voltage power supply 25 of low voltage control from the high-voltage power supply 25 of general widely used constant current control as the control method that applies voltage.
(experiment 8)
Follow toner image to six kinds of different conditions of difference such as picture pattern, environmental baseline, utilization is controlled by the FEEDBACK CONTROL of voltage control division 31 and is applied voltage Va so that Ib is Charging system 3 before the secondary transfer printing of-30 μ A, it is preceding charged to carry out secondary transfer printing, measures the carried charge of each toner image of charged front and back.Its result as shown in figure 14.
As shown in figure 14, before carrying out secondary transfer printing charged before, the carried charge of the toner image that fluctuates in the scope of about 3 μ C/g of-12～-15 μ C/g focuses on after charged in the scope of about 1 μ C/g of-18～-19 μ C/g.
Therefore, can reach a conclusion, the preceding Charging system 3 of secondary transfer printing with the voltage control division 31 that carries out above-mentioned FEEDBACK CONTROL is effective.
(experiment 9)
Then, to utilize Charging system 3 before the secondary transfer printing carry out before the secondary transfer printing when charged, and secondary transfer printing efficient when not carrying out compare.Figure 15 represents its result.
As shown in figure 15, charged by carrying out before the secondary transfer printing, transfer efficiency improves 5～10%, and also becomes big with respect to the amplitude (transfer printing allowance) of secondary transfer printing electric current.This has shown the preceding charged validity of secondary transfer printing of the preceding Charging system 3 of secondary transfer printing.
As above above-mentioned, Charging system 2, the preceding Charging system 3 of secondary transfer printing, latent image do not make the ozone generating amount suddenly carry out the release of negative ion with Charging system 4 with increasing before the primary transfer of present embodiment, therefore can prevent the anxious generation that increases the variety of issue that causes of ozone generating amount, can carry out the charged of photosensitive drums 1, or carry out the pre-transferring charged of the toner image that forms on the surface of photosensitive drums 1, intermediate transfer belt 15.
And the concrete numerical value shown in the present embodiment only is an example, the invention is not restricted to these values.
For example, being applied to the size that applies voltage that ion produces the high-voltage power supply (first voltage applying unit) 25 of pin (the charged electrode of use) 21 is that ion produces the above size of beginning voltage and gets final product less than the begin size of voltage of the anxious increase of ozone beginning voltage or the anxious increase of total current.Thus, produce pin 21 by ion and produce ion, therefore can make charged by charged thing.And the ozone generating amount is anxious to be increased owing to can not make, and therefore can solve because the anxious variety of issue that causes that increases of ozone generating amount.
And, " ion produces beginning voltage " is meant, produce at distance son and to apply voltage (shown in Fig. 6 chart when beginning to detect ion (number of ions begins to change) when the measuring ion device AIC-2000 that utilizes assistant rattan Itochu to make on the position of front end 150mm of pin (the charged electrode of use) 21 measures, improve when applying voltage the voltage when the measuring ion amount of ion measurement device rises).
And the above-mentioned size that applies voltage is preferably more than the size of the charged beginning voltage shown in Figure 12 (a), Figure 12 (b).Thus, can make conduct charged by the photosensitive drums 1 of charged thing, toner image reality.
And " charged beginning voltage " is meant under the g condition of a certain gap, and the ion that produces pin 21 generations by ion can make photosensitive drums 1, toner image etc. by the voltage minimum in the voltage that applies of the carried charge actual change of charged thing.
Further, the above-mentioned size that applies voltage preferably makes conduct by the saturated size of the carried charge of the toner image of charged thing as testing shown in 7.Thus, even produce unevenly in the generation of ion, the carried charge of the toner image after charged becomes on average, is fit to carry out transfer printing.Further, owing to can omit gate electrode, so ion need not be recovered to gate electrode, can improve the service efficiency of ion, and can suppress manufacturing cost.
On the other hand, be conceived to gap g, as long as gap g is greater than the anxious increase of ozone beginning distance or the anxious increase of total current beginning distance.So, the ozone generating amount can suddenly not increase, and therefore can solve the anxious variety of issue that causes that increases of ozone generating amount.
Further, gap g is preferably below the charged beginning distance shown in Figure 12 (a), Figure 12 (b).Thus, can make conduct actual charged by the photosensitive drums 1 of charged thing, intermediate transfer belt 15.
And, " charged beginning distance " be meant a certain and apply under the voltage conditions, produce by ion ion that pin 21 produces can make photosensitive drums 1, toner image etc. by the carried charge actual change of charged thing, ion produce the front end of pin 21 and by the distance between the charged thing (gap) in the distance of maximum.
In addition, the concrete preferred 4mm of gap g above, below the 25mm.Gap g is 4mm when above, as tests shown in 5, has the voltage regime that applies that does not make anxious the increasing of ozone generating amount and can produce ion.And if gap g is below the 25mm, then as testing shown in 1, therefore the arrival over half that can make the negative ion that produces by ion generation pin 21 can effectively be carried out charged by charged thing.
And, in the present embodiment, with electrode be used for to this chargedly, insert fixed resistance (resistor) 24 with between the high-voltage power supply (voltage applying unit) 25 of electrode application voltage charged.By insertion fixed resistance 24, as test shown in 5, can enlarge and not follow discharge only can make by the charged scope that applies voltage and gap (suitable application region) of charged thing, make ion stabilized emitting by ion.And this fixed resistance 24 is not necessarily leaveed no choice but insert, and also can omit.And the resistance value of fixed resistance 24 is not particularly limited, and suitably sets, and does not make enlarging that the ozone generating amount is anxious to be increased and can make by the charged scope that applies voltage and gap of charged thing by ion, and ion stabilized emitting got final product.
And, in the present embodiment, produce the radome (ions diffusion limiting part) 23 that is provided for preventing ions diffusion on every side of pin (the charged electrode of using) 21 at ion.By produce to ion pin 21 apply ion that voltage produces along line of electric force to by charged thing side shifting, but compare with the Charging system of existing corona discharge mode, the electric field that forms a little less than, therefore be not all to be released to by charged thing side, also exist to by the ion of the different direction diffusion of charged thing.Therefore,, can prevent ions diffusion, improve the utilization ratio of ion, but the parts of inhibition zone electric installation periphery be unnecessarily charged simultaneously by around ion generation pin 21, radome 23 being set.
And, in the present embodiment, as the charged electrode (ion produces pin 21) that uses needle-like with electrode.Therefore, compare when using wire or zigzag electrode as sparking electrode, can low-voltage form high electric field with existing general corona discharge Charging system.Thus, produce a large amount of ions by begin the little voltage that applies of the anxious increase of voltage or total current beginning voltage than corona discharge.
As above above-mentioned, the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; With first voltage applying unit, produce the voltage that begins voltage more than the beginning voltage, less than corona discharge to the above-mentioned charged ion that applies with electrode.
And, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, to the charged voltage that begins voltage more than the ion generation beginning voltage, less than corona discharge that applies with electrode of relative configuration with above-mentioned image-carrier.
And the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit produces voltage more than the beginning voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentionedly chargedly begin distance with the interval between the electrode greater than corona discharge.
And, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, ion is produced voltage more than the beginning voltage be applied to the charged electrode of using with the relative configuration in the interval that begins distance greater than corona discharge with above-mentioned image-carrier.
And the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit produces more than the beginning voltage, begins the voltage that the anxious voltage that increases is the anxious increase of ozone beginning voltage less than the ozone generating amount to the above-mentioned charged ion that applies with electrode.
And, the pre-transferring charged device that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, has the charged electrode of using, dispose relative with above-mentioned image-carrier by charged to apply with electrode that ion produces more than the beginning voltage, begins the anxious voltage that increases less than the ozone generating amount be that the voltage of the anxious increase of ozone beginning voltage produces ion to above-mentioned, makes above-mentioned transfer printing object charged by this ion.
And, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, the charged of relative configuration with above-mentioned image-carrier applied more than the ion generation beginning voltage, begins the voltage that the anxious voltage that increases is ozone anxious increase beginning voltage less than the ozone generating amount with electrode.
And, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, the charged electrode of using to relative configuration with above-mentioned image-carrier, apply ion produce beginning voltage above, less than the ozone generating amount begin the anxious voltage that increases be the voltage of the anxious increase of ozone beginning voltage to produce ion, make above-mentioned transfer printing object charged by this ion.
And the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit produces the voltage that begins more than the voltage to the above-mentioned charged ion that applies with electrode, and above-mentioned image-carrier and the above-mentioned charged distance that begins suddenly to increase greater than the ozone generating amount with the interval between the electrode are distance of anxious increase beginning of ozone.
And, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, the voltage that ion is produced more than the beginning voltage begins the interval that the anxious distance that increases is the anxious increase of an ozone beginning distance, the charged electrode of using of relative configuration with above-mentioned image-carrier to be applied to greater than the ozone generating amount.
And, distance of anxious increase beginning of above-mentioned ozone preferably: first voltage applying unit is applied to above-mentioned charged voltage with electrode and becomes the ozone generating amount and begin the distance that the anxious voltage that increases is ozone anxious increase beginning voltage.
And, voltage of anxious increase beginning of above-mentioned ozone is preferred: above-mentioned first voltage applying unit and above-mentioned chargedly do not insert under the situation of fixed resistance between with electrode, in the time of will increasing predetermined value to the charged voltage that applies with electrode at every turn, the voltage that applies that begins to produce at ozone is that ozone generating begins more than the voltage, and this ozone generating begins the applying in the voltage range below 2 times of voltage, with respect to the rate of change of the increment rate of the ozone generating amount that applies voltage is that the peaked voltage that applies is (when above-mentioned ozone generating begins above-mentioned rate of change in the voltage with respect to beginning voltage greater than ozone generating, and ozone generating begins the mean value that applies the above-mentioned rate of change in the voltage range below 2 times of voltage, be more than 2 times the time, be the voltage that applies that begins the big above-mentioned predetermined value of voltage than ozone generating), above-mentioned first voltage applying unit and above-mentioned chargedly inserted under the situation of fixed resistance between with electrode, in the time of will increasing predetermined value to the charged voltage that applies with electrode at every turn, at the voltage that begins to produce greater than ozone is that ozone generating begins voltage, and this ozone generating begins the applying in the voltage range below 2 times of voltage, with respect to the rate of change of the increment rate of the ozone generating amount that the applies voltage voltage that applies for maximum maximum value.
And the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; First voltage applying unit produces more than the beginning voltage, begins the voltage that the anxious voltage that increases is the anxious increase of electric current beginning voltage less than flowing through charged electric current with electrode to the above-mentioned charged ion that applies with electrode.
And, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, the charged electrode of using to relative configuration with above-mentioned image-carrier, apply ion produce beginning voltage above, less than as charged be the anxious voltage of establishing the voltage that begins newly of electric current with the anxious voltage that increases of the electric current that flows in the electrode (in other words, being provided to charged electric current (down with)) with electrode since first voltage applying unit.
And the pre-transferring charged device that the present invention relates to is, is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having: the charged electrode of using, dispose relative with above-mentioned image-carrier; With first voltage applying unit, produce voltage more than the beginning voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentioned charged to begin the anxious distance that increases be the anxious distance that begins of establishing newly of electric current greater than flowing through above-mentioned charged electric current with electrode with the interval between the electrode.
And, the pre-transferring charged method that the present invention relates to is, be used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that, ion is produced voltage more than the beginning voltage so that to begin the anxious distance that increases be the interval that distance is begun in the anxious increase of electric current greater than flowing through charged electric current with electrode, be applied to the charged electrode of using of relative configuration with above-mentioned image-carrier.
And, distance of anxious increase beginning of above-mentioned electric current preferably: first voltage applying unit is applied to above-mentioned charged voltage with electrode and becomes that to begin the anxious voltage that increases at the above-mentioned charged electric current that flows in electrode be the anxious distance of establishing the voltage that begins newly of electric current.
And, voltage of anxious increase beginning of above-mentioned electric current is preferred: above-mentioned first voltage applying unit and above-mentioned chargedly do not insert under the situation of fixed resistance between with electrode, in the time of will increasing predetermined value to the charged voltage that applies with electrode at every turn, charged with electrode in the electric current voltage that begins to flow be that electric current produces more than the beginning voltage, and produce beginning voltage applying in the voltage range below 2 times at this electric current, with respect to the rate of change of the increment rate of the electric current that applies voltage is that the peaked voltage that applies is (when above-mentioned electric current produces above-mentioned rate of change in the beginning voltage with respect to producing beginning voltage greater than electric current, and electric current produces the mean value that applies the above-mentioned rate of change in the voltage range below 2 times of beginning voltage, be more than 2 times the time, be the voltage that applies that produces the big above-mentioned predetermined value of beginning voltage than electric current), above-mentioned first voltage applying unit and above-mentioned chargedly inserted under the situation of fixed resistance between with electrode, in the time of will increasing predetermined value to the charged voltage that applies with electrode at every turn, greater than charged with electrode in the voltage of beginning streaming current be that electric current produces beginning voltage, and the applying in the voltage range below 2 times that produces beginning voltage at this electric current, with respect to apply voltage at the rate of change of the increment rate of the magnitude of current the voltage that applies for maximum maximum value.
And above-mentioned pre-transferring charged device is preferred: as the above-mentioned charged electrode of using, the electrode with a plurality of needle-likes or wire.
According to above-mentioned structure, because each charged wire that is shaped as, so compare with wire or zigzag electrode that the Charging system of existing general corona discharge mode has with electrode, can low-voltage form high electric field.Therefore, produce a large amount of ions, can make the toner image on the image-carrier effectively charged by begin the little voltage that applies of voltage than corona discharge.
Perhaps, above-mentioned pre-transferring charged device also: as the above-mentioned charged electrode of using, have a plurality of brush electrodes with a plurality of needle-likes or thread-like member boundling.
According to above-mentioned structure, by using the charged electrode of using of brush shape, can reduce the charged charged inequality that causes with electrode separation, improve charged homogeneity.And, when having adhered to foreign matters such as dust when the electrode front end, also can reduce charged inhomogeneity influence.
And it is preferred: above-mentioned image-carrier and above-mentioned charged with being spaced apart more than the 4mm, below the 25mm between the electrode.
By being set at more than the 4mm with the interval between electrode and the image-carrier, availablely beginning the low voltage that applies of voltage than corona discharge and generate (emitting) ion charged.On the other hand, charged big more with the interval between electrode and the image-carrier, the ionic weight (density) that arrives the toner image on the image-carrier reduces.Therefore, when above-mentioned interval is excessive, can't effectively make above-mentioned toner image charged, but, can fully provide charged necessary ion to toner image by above-mentioned interval is set to below the 25mm.
And above-mentioned pre-transferring charged device preferably further has the resistor that is inserted between above-mentioned charged usefulness electrode and the above-mentioned voltage applying unit.
By inserting resistor charged between with electrode and voltage applying unit, the difference that charged beginning voltage and corona discharge begin voltage becomes big.That is, produce ion without corona discharge and make the charged voltage range of toner image become big, therefore can carry out stable charged.
And above-mentioned pre-transferring charged device preferably further has: electrode is used in control, is configured in above-mentioned image-carrier and above-mentioned charged with between the electrode, is used to control the throughput of ion; With second voltage applying unit, apply predetermined voltage with electrode to above-mentioned control.
By control is set between with electrode and image-carrier use electrode, and apply predetermined voltage with electrode, can reclaim remaining ion with electrode, make the ionic weight equalization that is released to toner image, improve charged homogeneity by controlling to this control charged.
And, above-mentioned pre-transferring charged device also, above-mentioned first voltage applying unit applies the above voltage of voltage of the required size of the carried charge amount of reaching capacity of the toner image on the above-mentioned image-carrier.
When the ionic weight of emitting being increased make toner image charged, the carried charge of toner image increases at first along with the increase of ion generation (ionic weight of emitting to toner image), but saturated at certain a moment.According to above-mentioned structure, charged with having applied sufficient voltage on the electrode so that the carried charge amount of reaching capacity of toner image, even the distribution of the therefore charged ionic weight that produces with electrode is slightly uneven, also can make the carried charge equalization of the toner image after charged.So, can omit the gate electrode that uses in the prior art.If the omission gate electrode, then ion can not be recovered to gate electrode, therefore can improve the service efficiency of ion, and can suppress manufacturing cost.
And above-mentioned pre-transferring charged device preferably further has voltage control unit, according to current amount flowing in above-mentioned image-carrier, controls the voltage swing that above-mentioned voltage applying unit applies.
The generation of ion is because of being attached to changes such as charged foreign matter with the electrode leading section, environmental baseline.And with near the wind direction variation the electrode, image-carrier etc., the ratio that the ion of generation arrives toner image also changes because of charged.Therefore, even make the voltage that is applied to charged usefulness electrode keep certain, because the influence of above-mentioned change also always can't be identical amount to the carried charge of toner image.Therefore, because be released to the ionic weight of toner image and in image-carrier current amount flowing equate, therefore will be in this image-carrier current amount flowing as the index that is released to the ionic weight of toner image, be applied to the charged size that applies voltage according to this control indexes with electrode, thereby can get rid of the influence that above-mentioned change causes, always give toner image the ionic weight of the best.
Concrete example comprises: the voltage swing that the above-mentioned voltage applying unit of above-mentioned voltage control unit FEEDBACK CONTROL applies, when to make the magnitude of current that flows through on the above-mentioned image-carrier be the carried charge amount of reaching capacity of the toner image on the above-mentioned image-carrier in above-mentioned image-carrier more than the current amount flowing.
According to above-mentioned structure, carry out FEEDBACK CONTROL, more than the amount when to make in image-carrier current amount flowing be the carried charge amount of reaching capacity of toner image, therefore can get rid of the influence that above-mentioned change causes, stably make the toner image uniform charged.
And above-mentioned pre-transferring charged device preferably further has the ions diffusion limiting part, and it is arranged to surround the above-mentioned charged electrode of using, and has and above-mentioned image-carrier opening opposing portion.
By to the charged ion that produces with electrode application voltage along line of electric force to image-carrier one side shifting, but compare with the Charging system of existing corona discharge mode, the electric field that forms a little less than, therefore be not all to be released to the image-carrier side, also exist to the ion of image-carrier different directions diffusion.Therefore, by being arranged on the ions diffusion limiting part that the image-carrier side has peristome around with electrode, can suppress the diffusion of ion, and improve the service efficiency of ion charged.And, also can suppress to make the unnecessarily charged problem of parts of Charging system periphery because of the ion of diffusion.
And, preferred: in the above-mentioned ions diffusion limiting part and above-mentioned charged with the relative face of electrode by insulating material or have and above-mentioned chargedly form with the high-resistance material that does not produce the resistance value of corona discharge between the electrode.
According to above-mentioned structure, in the ions diffusion limiting part with above-mentioned charged be insulating material or high-resistance material with the relative face of electrode, even so charged shorter, also can prevent from the ions diffusion limiting part is produced corona discharge with the interval between electrode and the ions diffusion limiting part.
And the image processing system that the present invention relates to is to carry out the image processing system that image forms by the electrofax mode, it is characterized in that having: above-mentioned any one pre-transferring charged device; With above-mentioned image-carrier.
And, above-mentioned image processing system also, has photoreceptor as above-mentioned image-carrier, be driven in rotation, the toner image that self surface is gone up carrying is transferred to offset medium at the first transfer printing position, and above-mentioned pre-transferring charged device is configured in than the sense of rotation upstream side of the above-mentioned first transfer printing position near photoreceptor.
According to above-mentioned structure, before being transferred to offset medium, can carry out chargedly to toner image from photoreceptor, therefore can improve the transfer efficiency of the toner image from the photoreceptor to the offset medium.
And, above-mentioned image processing system also, have photoreceptor and the intermediate transfer body that is driven in rotation as above-mentioned image-carrier, above-mentioned photoreceptor is used for the toner image of self surface bears is transferred to the intermediate transfer body at the first transfer printing position, above-mentioned intermediate transfer body is used for the toner image from above-mentioned photoreceptor transfer printing is transferred to recording medium again at the second transfer printing position at the first transfer printing position, above-mentioned pre-transferring charged device is configured in than the sense of rotation downstream of the above-mentioned first transfer printing position by above-mentioned intermediate transfer body, and than the above-mentioned second transfer printing position by the sense of rotation upstream side of above-mentioned intermediate transfer body, will be charged before the second transfer printing position is transferred to recording medium again from the toner image of above-mentioned photoreceptor transfer printing.
According to above-mentioned structure, before being transferred to recording medium, can carry out chargedly to toner image from middle transfer article, therefore can improve the transfer efficiency of toner image from middle transfer article to recording medium.
And above-mentioned image processing system also has: first and second above-mentioned pre-transferring charged device; The photoreceptor and the intermediate transfer body that are driven in rotation as above-mentioned image-carrier, above-mentioned photoreceptor is used for the toner image of self surface bears is transferred to the intermediate transfer body at the first transfer printing position, above-mentioned intermediate transfer body is used for the toner image from above-mentioned photoreceptor transfer printing is transferred to recording medium again at the second transfer printing position at the first transfer printing position, the above-mentioned first pre-transferring charged device is configured in than the transfer printing direction upstream side of the above-mentioned first transfer printing position by above-mentioned photoreceptor, and the above-mentioned second pre-transferring charged device is configured in than sense of rotation downstream one side of the above-mentioned first transfer printing position by above-mentioned intermediate transfer body, and than the sense of rotation upstream side of the above-mentioned second transfer printing position near above-mentioned intermediate transfer body.
According to above-mentioned structure, to before the primary transfer and the toner image before the secondary transfer printing all can carry out chargedly, therefore can further improve transfer efficiency.Wherein, use above-mentioned pre-transferring charged device in each pre-transferring charged device, the problem of discharge products such as ozone, oxides of nitrogen therefore can not occur producing.
And above-mentioned image processing system also can further have Charging system, and it has: the charged electrode of using, the surperficial relative configuration of the above-mentioned photoreceptor preceding with forming toner image; And voltage applying unit, produce the voltage that begins voltage more than the beginning voltage, less than corona discharge to this charged ion that applies with electrode.
According to above-mentioned structure, before forming electrostatic latent image,, use and the identical device of above-mentioned pre-transferring charged device as making the charged Charging system of photoreceptor in advance, therefore can further suppress the generation of discharge products such as ozone, oxides of nitrogen.And, to containing a plurality of Charging systems of photoreceptor,, can realize the general of high-voltage power supply, and realize simplification, cheapization of image processing system by using and the identical device of above-mentioned pre-transferring charged device with Charging system, neutralizer etc.
The present invention can be used for: in the image processing system that uses the electrofax mode, make the toner image that forms on the image-carriers such as photoreceptor, intermediate transfer body at pre-transferring charged pre-transferring charged device.
The invention is not restricted to above-mentioned embodiment, in scope shown in the claim, can carry out various changes.That is, the embodiment that technological means obtained that combination is suitably changed in scope shown in the claim is also contained in the technical scope of the present invention.
And reasonable range beyond the numerical range shown in this instructions, that do not violate purport of the present invention is also contained in the scope of the invention certainly.
More than Shuo Ming embodiment or embodiment only are used for clear and definite technology contents of the present invention, must not only be defined in these concrete examples and do the explanation of narrow sense, in spirit of the present invention and claim scope, can carry out various changes and enforcement.

Claims (22)

1. pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having:
The charged electrode of using, dispose relative with above-mentioned image-carrier; And
First voltage applying unit produces the voltage that begins voltage more than the beginning voltage, less than corona discharge to the above-mentioned charged ion that applies with electrode.
2. pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having:
The charged electrode of using, dispose relative with above-mentioned image-carrier; And
First voltage applying unit produces the voltage that begins more than the voltage to the above-mentioned charged ion that applies with electrode,
Above-mentioned image-carrier and above-mentionedly chargedly begin distance greater than corona discharge with the interval between the electrode.
3. pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having:
The charged electrode of using, dispose relative with above-mentioned image-carrier; And
First voltage applying unit produces more than the beginning voltage, begins the voltage that the anxious voltage that increases is the anxious increase of ozone beginning voltage less than the ozone generating amount to the above-mentioned charged ion that applies with electrode.
4. pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having:
The charged electrode of using, dispose relative with above-mentioned image-carrier; And
First voltage applying unit produces the voltage that begins more than the voltage to the above-mentioned charged ion that applies with electrode,
Above-mentioned image-carrier and the above-mentioned charged distance that begins suddenly to increase greater than the ozone generating amount with the interval between the electrode are distance of anxious increase beginning of ozone.
5. pre-transferring charged device according to claim 4 is characterized in that,
Distance of anxious increase beginning of above-mentioned ozone is: first voltage applying unit is applied to above-mentioned charged voltage with electrode and becomes the ozone generating amount and begin the distance that the anxious voltage that increases is ozone anxious increase beginning voltage.
6. according to claim 3 or 5 described pre-transferring charged devices, it is characterized in that,
Voltage of anxious increase beginning of above-mentioned ozone is meant: above-mentioned first voltage applying unit and above-mentioned chargedly do not insert under the situation of fixed resistance between with electrode, will be when the above-mentioned charged voltage that applies with electrode increases setting at every turn, the voltage that applies that begins to produce at ozone is that ozone generating begins more than the voltage, and begin the applying in the voltage range below 2 times of voltage in above-mentioned ozone generating, rate of change with respect to the increment rate of the ozone generating amount that applies voltage becomes the peaked voltage that applies, wherein, begin above-mentioned rate of change in the voltage with respect to the mean value that is beginning voltage and the above-mentioned rate of change in ozone generating begins the voltage range below 2 times of voltage greater than ozone generating in above-mentioned ozone generating, be under the situation more than 2 times, voltage of anxious increase beginning of above-mentioned ozone is to begin the voltage that applies that voltage is compared only big afore mentioned rules value with ozone generating
Voltage of anxious increase beginning of above-mentioned ozone is meant: at above-mentioned first voltage applying unit and charged with inserting between the electrode under the situation of fixed resistance, will be when the charged voltage that applies with electrode increases setting at every turn, at the voltage that begins to produce greater than ozone is that ozone generating begins voltage and in this ozone generating begins the voltage range below 2 times of voltage, with respect to the rate of change of the increment rate of the ozone generating amount that the applies voltage voltage that applies for maximum maximum value.
7. pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having:
The charged electrode of using, dispose relative with above-mentioned image-carrier; And
First voltage applying unit produces more than the beginning voltage, begins the voltage that the anxious voltage that increases is the anxious increase of electric current beginning voltage less than flowing through charged electric current with electrode to the above-mentioned charged ion that applies with electrode.
8. pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having:
The charged electrode of using, dispose relative with above-mentioned image-carrier; And
First voltage applying unit produces the voltage that begins more than the voltage to the above-mentioned charged ion that applies with electrode,
Above-mentioned image-carrier and above-mentioned charged be the anxious increase of electric current beginning distance with the interval between the electrode greater than beginning the anxious distance that increases at the charged electric current that flows in electrode.
9. pre-transferring charged device according to claim 8 is characterized in that,
Distance of anxious increase beginning of above-mentioned electric current is: first voltage applying unit is applied to above-mentioned charged voltage with electrode and becomes and flow through above-mentioned charged electric current with electrode to begin the anxious voltage that increases be the anxious distance of establishing the voltage that begins newly of electric current.
10. according to claim 7 or 9 described pre-transferring charged devices, it is characterized in that,
Voltage of anxious increase beginning of above-mentioned electric current is meant: above-mentioned first voltage applying unit and above-mentioned chargedly do not insert under the situation of fixed resistance between with electrode, will be when the above-mentioned charged voltage that applies with electrode increases setting at every turn, at the above-mentioned charged voltage that begins to flow through electric current in electrode is that electric current produces more than the beginning voltage, and produce the applying in the voltage range below 2 times that begins voltage at this electric current, rate of change with respect to the increment rate of the electric current that applies voltage becomes the peaked voltage that applies, wherein, the above-mentioned rate of change that produces in the beginning voltage at above-mentioned electric current begins voltage with respect to producing greater than electric current, and produce the mean value that applies the above-mentioned rate of change in the voltage range below 2 times that begins voltage at electric current, be under the situation more than 2 times, voltage of anxious increase beginning of above-mentioned electric current is to produce the voltage that applies that beginning voltage is compared only big afore mentioned rules value with electric current
Voltage of anxious increase beginning of above-mentioned electric current is meant: at above-mentioned first voltage applying unit and above-mentioned charged with inserting between the electrode under the situation of fixed resistance, will be when the above-mentioned charged voltage that applies with electrode increases setting at every turn, in that to be that electric current produces beginning voltage big and the applying in the voltage range below 2 times that this electric current produces beginning voltage, be the voltage that applies of rate of change with respect to the above-mentioned charged increment rate with the electric current that flows through in the electrode that the applies voltage maximum value that becomes maximum than the above-mentioned charged voltage that begins to have electric current in electrode.
11. a pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, it is characterized in that having:
The charged electrode of using, dispose relative with above-mentioned image-carrier,
By charged to apply with electrode that ion produces more than the beginning voltage, begins the anxious voltage that increases less than the ozone generating amount be that the voltage of the anxious increase of ozone beginning voltage produces ion to above-mentioned, make above-mentioned transfer printing object charged by this ion.
12. an image processing system carries out image by the electrofax mode and forms, and it is characterized in that having: pre-transferring charged device; With above-mentioned image-carrier,
Above-mentioned pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, has: the charged electrode of using, dispose relative with above-mentioned image-carrier; And first voltage applying unit, produce the voltage that begins voltage more than the beginning voltage, less than corona discharge to the above-mentioned charged ion that applies with electrode.
13. an image processing system carries out image by the electrofax mode and forms, and it is characterized in that having: pre-transferring charged device; With above-mentioned image-carrier,
Above-mentioned pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, has: the charged electrode of using, dispose relative with above-mentioned image-carrier; And first voltage applying unit, produce voltage more than the beginning voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentionedly chargedly begin distance greater than corona discharge with the interval between the electrode.
14. an image processing system carries out image by the electrofax mode and forms, and it is characterized in that having: pre-transferring charged device; With above-mentioned image-carrier,
Above-mentioned pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, has: the charged electrode of using, dispose relative with above-mentioned image-carrier; And first voltage applying unit, produce more than the beginning voltage, begin the voltage that the anxious voltage that increases is the anxious increase of ozone beginning voltage to the above-mentioned charged ion that applies with electrode less than the ozone generating amount.
15. an image processing system carries out image by the electrofax mode and forms, and it is characterized in that having: pre-transferring charged device; With above-mentioned image-carrier,
Above-mentioned pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, has: the charged electrode of using, dispose relative with above-mentioned image-carrier; And first voltage applying unit, produce voltage more than the beginning voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentioned charged to begin the anxious distance that increases with the interval between the electrode greater than the ozone generating amount be the anxious increase of the ozone distance that begins.
16. an image processing system carries out image by the electrofax mode and forms, and it is characterized in that having: pre-transferring charged device; With above-mentioned image-carrier,
Above-mentioned pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, has: the charged electrode of using, dispose relative with above-mentioned image-carrier; And first voltage applying unit, produce more than the beginning voltage, begin the voltage that the anxious voltage that increases is electric current anxious increase beginning voltage to the above-mentioned charged ion that applies with electrode less than flowing through charged electric current with electrode.
17. an image processing system carries out image by the electrofax mode and forms, and it is characterized in that having: pre-transferring charged device; With above-mentioned image-carrier,
Above-mentioned pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, has: the charged electrode of using, dispose relative with above-mentioned image-carrier; And first voltage applying unit, produce voltage more than the beginning voltage to the above-mentioned charged ion that applies with electrode, above-mentioned image-carrier and above-mentioned charged to begin the anxious distance that increases be the anxious distance that begins of establishing newly of electric current greater than flowing through charged electric current with electrode with the interval between the electrode.
18. an image processing system carries out image by the electrofax mode and forms, and it is characterized in that having: pre-transferring charged device; With above-mentioned image-carrier,
Above-mentioned pre-transferring charged device is used to make the toner image on the image-carrier of image processing system charged before being transferred to the transfer printing object, have: have the charged electrode of using, dispose relative with above-mentioned image-carrier, by charged to apply with electrode that ion produces more than the beginning voltage, begins the anxious voltage that increases less than the ozone generating amount be that the voltage of the anxious increase of ozone beginning voltage produces ion to above-mentioned, make above-mentioned transfer printing object charged by this ion.
19. each the described image processing system according to claim 12 to 18 is characterized in that,
Comprise photoreceptor as above-mentioned image-carrier, be driven in rotation that the toner image that self surface is gone up carrying is transferred on the offset medium at the first transfer printing position,
Above-mentioned pre-transferring charged device is configured in than the sense of rotation upstream side of the above-mentioned first transfer printing position by photoreceptor.
20. each the described image processing system according to claim 12 to 18 is characterized in that,
As above-mentioned image-carrier, comprise the photoreceptor and the intermediate transfer body that are driven in rotation,
Above-mentioned photoreceptor is transferred to the toner image of self surface bears on the intermediate transfer body at the first transfer printing position,
Above-mentioned intermediate transfer body will the toner image from above-mentioned photoreceptor transfer printing be transferred on the recording medium at the second transfer printing position at the first transfer printing position again,
Above-mentioned pre-transferring charged device is configured in than the above-mentioned first transfer printing position and leans on the sense of rotation downstream of above-mentioned intermediate transfer body and than the sense of rotation upstream side of the above-mentioned second transfer printing position by above-mentioned intermediate transfer body, will make it charged before the second transfer printing position is transferred on the recording medium again from the toner image of above-mentioned photoreceptor transfer printing.
21. each the described image processing system according to claim 12 to 18 is characterized in that,
Have: first and second above-mentioned pre-transferring charged device; And
The photoreceptor and the intermediate transfer body that are driven in rotation as above-mentioned image-carrier,
Above-mentioned photoreceptor is transferred to the toner image of self surface bears on the intermediate transfer body at the first transfer printing position,
Above-mentioned intermediate transfer body will the toner image from above-mentioned photoreceptor transfer printing be transferred on the recording medium at the second transfer printing position at the first transfer printing position again,
The above-mentioned first pre-transferring charged device is configured in than the transfer printing direction upstream side of the above-mentioned first transfer printing position by above-mentioned photoreceptor,
The above-mentioned second pre-transferring charged device is configured in than the above-mentioned first transfer printing position by the sense of rotation downstream of above-mentioned intermediate transfer body and than the sense of rotation upstream side of the above-mentioned second transfer printing position by above-mentioned intermediate transfer body.
22. image processing system according to claim 19 is characterized in that,
Also have Charging system, above-mentioned Charging system has: the charged electrode of using, the surperficial relative configuration of the above-mentioned photoreceptor preceding with forming toner image; And
Voltage applying unit produces the voltage that begins voltage more than the beginning voltage, less than corona discharge to this charged ion that applies with electrode.
CNB2007100057989A 2006-02-13 2007-02-13 Pre-transferring charged device and image forming device having same Expired - Fee Related CN100487598C (en)

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CN107239584A (en) * 2016-03-28 2017-10-10 青岛海尔智能技术研发有限公司 Drum type brake ion air-supply module pin net layout's method and drum type brake ion air-supply module
CN107239585A (en) * 2016-03-28 2017-10-10 青岛海尔智能技术研发有限公司 Ion air-supply module pin net layout's method and ion air-supply module
CN107239584B (en) * 2016-03-28 2021-07-27 青岛海尔智能技术研发有限公司 Needle net layout method for cylindrical ion air supply module and cylindrical ion air supply module
CN107239585B (en) * 2016-03-28 2021-07-27 青岛海尔智能技术研发有限公司 Ion air supply module needle net layout method and ion air supply module

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