CN104035297A - Image forming device - Google Patents

Abstract

The present invention provides an image forming device which is capable of inhibiting image concentration dis-uniformity on one hand, and preventing a line dust and a line from diming on the other hand when printing images with high image area rate. The image forming device comprises a toner concentration sensor (390) for the concentration of the toner in a detection recycling agent accommodation chamber (311), and an engine control portion which adjusts a write light intensity of an electro-static latent image of a photoreceptor according to an output difference deltaVt of an output voltage of the toner concentration sensor (390) when two screw rod components (304, 305) are driven by a normal rotation speed and an output voltage of the toner concentration sensor (390) when the two screw rod components (304, 305) are driven by speed lower than the normal rotation speed.

Description

Image processing system

Technical field

The present invention relates to a kind of image processing system, the imaging mechanism of it the includes developing mechanism such as the sub-image that is provided with the sub-image bearing member of photoreceptor etc., sub-image is written to laser writing station in sub-image bearing member etc. writes mechanism, developing apparatus that the sub-image on sub-image bearing member is developed.

Background technology

In the past, be generally well known that what patent documentation 1 was recorded as this image processing system.Shown in Figure 16, be photoreceptor 910 in the image processing system recorded of patent documentation 1 and the pie graph of developing apparatus 901.In this figure, form electrostatic latent image on the surface of photoreceptor 910 by known electrofax processing, and this electrostatic latent image becomes toner image after being developed by developing apparatus 901.Developing apparatus 901 includes developer carrier body 907, supplying agent reception room 903, upper screw member 902 as supplying agent conveyance member, recovery catalyst reception room 906 and as lower screw member 905 of recovery catalyst conveyance member etc.Developer carrier body 907 is the developers that make to be positioned in himself magnetic carrier on surface and the potpourri of toner, along with self revolution conveyance is to photoreceptor 910 in opposite directions and after in right position, the electrostatic latent image developing on photoreceptor 910.In addition, supplying agent reception room 903 is to cut out the side of putting body 907 at developer to accommodate developer for being supplied to 907 li of developer carrier bodies.In addition, upper screw member 902 is to be housed in developer in supplying agent reception room 903 along with the revolution of self is supplied in developer carrier body 907 in conveyance in axis of rotation direction.In addition, recovery catalyst reception room 906 is to accommodate after the developer of accepting the development of retrieving from developer carrier body 907.In addition, lower screw member 905 is along with the revolution of self is sent in supplying agent reception room 903 after conveyance in axis of rotation direction by the developer in recovery catalyst reception room 906.

The base plate of supplying agent reception room 903 is provided with the first not shown opening in the end of the inner side of the direction of the paper perpendicular to this figure.Recovery catalyst reception room 906 is to be interconnected by means of the first described opening with the supplying agent reception room 903 being configured under it.In recovery catalyst reception room 906, lower screw member 905 be accompanied by revolution by developer the front side the direction of the paper perpendicular to this figure towards inboard conveyance.By conveyance near the developer inboard end of recovery catalyst reception room 906 in being pushed by follow-up developer, enter into the supplying agent reception room 903 of top through the first described opening from recovery catalyst reception room 906.

In supplying agent reception room 903, upper screw member 902 be accompanied by revolution by developer the inboard the direction of the paper perpendicular to this figure towards front side conveyance.In this process, a part of toner coming by upper screw member 902 conveyances is drawn on the surface of developer carrier body 907.Then, along with the revolution of developer carrier body 907, by photoreceptor 910 and developer carrier body 907 in opposite directions and after right developing regional for after developing, after developer carrier body 907 comes off, be recycled in recovery catalyst reception room 906.

The base plate of supplying agent reception room 903 is provided with the second not shown opening in the end of the front of the direction of the paper perpendicular to this figure side.In supplying agent reception room 903, do not drawn developer on developer carrier body 907 just by upper screw member 902 by conveyance near the end of the front side in the direction of the paper perpendicular to this figure, and by falling in recovery catalyst reception room 906 after described the second opening.

So, recovery catalyst reception room 906 is disposed in supplying agent reception room 903 below formation in, compared with being disposed in the formation of side of supplying agent reception room 903, in the time of the image of continuous printing hi-vision area occupation ratio, can suppress the generation of image color inequality.Be exactly specifically, in the past, different from the formation shown in this figure, be well known that recovery catalyst reception room is disposed in to the developing apparatus in the side of supplying agent reception room.More detailed, while utilizing this figure to illustrate, be that the recovery catalyst reception room 906 in this figure and lower screw member 905 are disposed in the figure of supplying agent reception room 903 in the side of right side.In this formation, from supplying agent reception room (903) drawn revolution that developer developer carrier body (907) is accompanied by developer carrier body after by developing regional when developer carrier body departs from, can all be recycled in supplying agent reception room (903).Developer after being recovered has been because reduced toner concentration for development, in order to bring into play common developing performance, just need to move to the supply of accepting toner after recovery catalyst reception room (906).But, a part for the developer being recovered sometimes before moving to recovery catalyst reception room, just drawn developer carrier body above conveyance to developing regional.Thus, the image color deficiency of a part for image has just produced image color inequality afterwards.In the time of the image of continuous wave output hi-vision area occupation ratio, because the toner concentration of the developer being recovered declines to a great extent, so just easily cause this image color inequality.

On the other hand, in the formation shown in this figure, the revolution that is accompanied by developer carrier body 907 from the interior developer being drawn developer carrier body 907 of supplying agent reception room 903 is cut out when putting body and departing from from developer after by developing regional, can all be recycled in recovery catalyst reception room 906.Then, after accepting toner replenishing, recovery catalyst reception room 906 turns back in supplying agent reception room 903.Because can will again not draw on developer carrier body 907 in the developer of the low state of toner concentration, so just can suppress the generation of image color inequality.

But, can know easy generation transfer printing dust (hereinafter referred to as line dust) around line image in this formation, or the line of line image thick not enough (attenuating hereinafter referred to as line) according to the present inventors' experiment.The present inventors are obtaining following discovery to occurring after reason that these line dust or line are thin is carried out deep research.

That is, recovery catalyst reception room 906 is disposed in supplying agent reception room 903 below formation in, in the time that environmental turbulence causes the mobility of toner to change in time, follow therewith be that developer carrier body 907 also can change the amount of drawing of developer.The quantitative change of drawing of developer obtains when more, and the toner adhesion amount of image can become more.So, make toner adhesion amount greatly superfluous in line image portion because of boundary effect, thereby caused line dust.In order to suppress the generation of this line dust, for line image, be to make the intensity that writes of sub-image further reduce afterwards lower than solid image portion the current potential that develops.Like this, in the time that drawing of developer shows fewer, after the toner adhesion amount deficiency of line image portion, will there is line and attenuate.

No. 3104722 communique of [patent documentation 1] (Japan) special permission

Summary of the invention

The present invention, in view of above-mentioned background, can suppress the generation of image color inequality on one side when object is to provide a kind of image at continuous printing hi-vision area occupation ratio, can suppress again on one side the image processing system of the generation that line dust or line attenuate.

To achieve these goals, technical scheme of the present invention relates to a kind of image processing system that is provided with imaging mechanism, described imaging mechanism includes sub-image bearing member, write mechanism with the sub-image that sub-image is write to described sub-image bearing member, and the developing mechanism of the sub-image that develops on described sub-image bearing member, described developing mechanism comprises: developer carrier body, and it develops after described sub-image and obtains toner image with being positioned in self lip-deep developer; Supplying agent reception room, accommodate for being supplied to the developer on described developer carrier body its side at described developer carrier body; Supplying agent conveyance member, its revolution along with self drives another distolateral conveyance of one end side direction from axis of rotation by the developer in described supplying agent reception room; Recovery catalyst reception room, it is provided in the below of described supplying agent reception room, and accommodates the developer of retrieving from described developer carrier body in acceptance; Recovery catalyst conveyance member, its revolution along with self drives the developer in described recovery catalyst reception room is delivered to described supplying agent reception room from the distolateral conveyance of other end side direction one of axis of rotation, it is characterized in that comprising, toner concentration testing agency, it detects the toner concentration of the developer in described recovery catalyst reception room; Control gear, the output of the described toner concentration testing agency when pick of its root drives described developer to cut out to put body, described supplying agent conveyance member and described recovery catalyst conveyance member with fixing speed, with the difference of the output of the described toner concentration testing agency when driving lower than the speed of described fixing speed, adjust the image-forming condition adjustment processing of the image-forming condition of described imaging mechanism.

In the present invention, by the reason of following explanation, just in the time of the image of continuous printing hi-vision area occupation ratio, can suppress the generation of image color inequality on one side, can suppress again the generation that line dust or line attenuate on one side.; it was all generally the testing result of the toner concentration to the developer in developing apparatus according to the toner concentration sensor being formed by magnetoconductivity sensor in the past; appropriate toner replenishing, to after in developing apparatus, is maintained the toner concentration of developer in certain scope.In dry run developing apparatus, because the toner of developer is not consumed, so the output voltage of toner concentration sensor should be maintained at certain in.But in the formation shown in Figure 16, the in the situation that of dry run developing apparatus, when the revolution actuating speed of two screw members or developer carrier body 907 is switched, the output voltage of toner concentration sensor correspondingly can larger variation.Details will be narrated in the back, still, in the time switching the revolution actuating speed of screw member etc., in the output voltage of toner concentration sensor that can be before and after switching, difference occur.Then, can know that this difference and the amount of drawing of switching previous developer are correlationship.That is to say, according to this difference, just can hold the amount of drawing of developer.

In the present invention, by reclaim with the recovery catalyst reception room that is provided in supplying agent reception room below by after drawing on developer carrier body through the developer in opposite directions and after right developing regional with sub-image bearing member, just the developer that leaves developer carrier body can be recovered in supplying agent reception room.Thus, in the time of the image of continuous printing hi-vision area occupation ratio, can suppress the generation of image color inequality.

In addition, in the present invention, the output of the toner concentration testing agency when drive developer carrier body, supplying agent conveyance member and recovery catalyst conveyance member with fixing speed, and the difference of the output of toner concentration testing agency when driving lower than the speed of described fixing speed is held.This difference has reflected the amount of drawing of the developer of the developer carrier body while driving developer sanction to put body, supplying agent conveyance member and recovery catalyst conveyance member with fixing speed.According to this difference, while being more, reduce the imaging performance of imaging mechanism in the amount of drawing that judges developer by the adjustment of image-forming condition, just the toner adhesion amount of line image can be reduced to the generation that appropriate value suppressed line dust afterwards.In addition, according to described difference, while being less, improve the imaging performance of imaging mechanism in the amount of drawing that judges developer by the adjustment of image-forming condition, just the toner adhesion amount of line image can be increased to appropriate value and suppress afterwards the generation that line attenuates.

Brief description of the drawings

It shown in Fig. 1, is the summary pie graph of the related printer of embodiment.

It shown in Fig. 2, is the amplification pie graph of the image-generating unit of this printer.

Shown in Fig. 3, be photoreceptor in this printer and the sectional view of developing apparatus.

It shown in Fig. 4, is the longitudinal diagram of the developer roll of this developing apparatus.

Shown in Fig. 5, be the supplying agent conveyance screw rod of this developing apparatus and the oblique view of recovery catalyst conveyance screw rod.

It shown in Fig. 6, is the exploded perspective view of this supplying agent conveyance screw rod and recovery catalyst conveyance screw rod.

It shown in Fig. 7, is near the sectional view after this photoreceptor and developing apparatus being decided what is right and what is wrong the inboard end in the direction of the paper perpendicular to figure.

It shown in Fig. 8, is the module map of a part for the circuit of this printer.

Shown in Fig. 9, be the supplying agent reception room of this developing apparatus and the amplification pie graph of recovery catalyst reception room.

It shown in Figure 10, is the graph of a relation of the speed of gyration of screw member and the output voltage of toner concentration sensor.

It shown in Figure 11, is the graph of a relation between output difference △ Vt and the developer amount of drawing of sleeve.

It shown in Figure 12, is the mode chart of a part for the picture element matrix of page.

It shown in Figure 13, is the mode chart of the second case of the picture element matrix of page.

It shown in Figure 14, is the mode chart of the first case of the state of each pixel around of border for solid image portion is described and the relation of electric field intensity.

It shown in Figure 15, is the mode chart of the second case of the state of each pixel around of border for solid image portion is described and the relation of electric field intensity.

Shown in Figure 16, be photoreceptor in the image processing system recorded of patent documentation 1 and the pie graph of developing apparatus.

Embodiment

Below, as applicable image processing system of the present invention, the embodiment of the color printer (being designated hereinafter simply as printer) to electronic photo mode describes.First, the basic comprising of the related printer of embodiment is described.It shown in Fig. 1, is the summary pie graph of the related printer of embodiment.This printer includes four groups of image-generating unit 17K, the M, Y, the C that are used to form the toner image of all kinds such as K (black), M (magenta), Y (yellow), C (cyan).In addition, also include the first paper supply cartridge 22, the second paper supply cartridge 21, the 3rd paper supply cartridge 20, paper supply path, contraposition roller to 23, transfer printing unit, fixing device 24, stacking portion 25 etc.Further, the add-word K of each symbol, M, Y, C represent respectively the member that black, magenta, yellow, cyan are used.

Image-generating unit 17K, M, Y, C include photoreceptor 1K, M, Y, the C as the drum type of sub-image bearing member, with Charging system 2K, M, Y, C, with developing apparatus 3K, M, Y, C, with drum cleaning device 6K, M, Y, C, and optical writing device 16K, M, Y, C etc.

Photoreceptor 1K, M, Y, C have covered the drum shape after organic photosensitive layer on the metal tube of aluminium etc., and are clockwise rotated in the drawings in direction and driven by revolution with the linear velocity of regulation by not shown driving mechanism.Then, optical writing device 16K, the M, Y, the C that write light inlet L that modulate by the image information sent here according to not shown personal computer etc. of transmitting, loaded by photoscanning the electrostatic latent image that K, M, Y, C use darkling afterwards.

It shown in Fig. 2, is the amplification pie graph of image-generating unit.Further, image-generating unit of all kinds is except the color difference of used toner, because other formation is all identical, so omitted in the figure K, M, Y, the C add-word at symbol end.Developing apparatus 3 is in the inside of cavity 301, to be provided with developer roll 302, developer limiting member 303, supplying agent reception room 310, recovery catalyst reception room 311 etc.In addition, also include supplying agent conveyance screw rod 304 and recovery catalyst conveyance screw rod 305 etc.The external diameter of the helical blade of these screw rods is below 18mm.Further, shown in Fig. 2, be near the developing apparatus 3 end of the front side in the direction of the paper perpendicular to figure.

It shown in Fig. 3, is the sectional view of photoreceptor 1 and developing apparatus 3.Developer roll 302 is among the sleeve 302c being driven by revolution centered by revolving shaft 302e, comprised can not driven rotation magnetic roller 302d, this magnetic roller 302d has the multiple magnet MG arranging in a circumferential direction.The diameter of this developer roll 302 is below 14mm.Sleeve 302c is formed by nonmagnetic metals such as aluminium.In addition, in addition, magnetic roller 302d is such as fixed in cavity 301 fixed components such as grade, to make the direction of each magnet MG towards regulation.Then, be adsorbed onto on the surface of sleeve 302c by this magnetic field force developer.

It shown in Fig. 4, is the longitudinal diagram of developer roll.In the figure, stationary shaft 302a is fixed in not shown cavity (301) and can not turns round.On this stationary shaft 302a, be fixed with columned magnetic roller 302d.Then, sleeve 302c covers magnetic roller 302d by means of the spacing of regulation.In an end of sleeve 302c length direction, be fixed with revolving shaft 302e.Revolving shaft 302e freely turns round by bearing 302f, and is turned round driving by not shown rotary motion mechanism.

In the periphery of left magnetic roller 302d, in the interval of regulation, be fixed with multiple magnet MG in a circumferential direction as illustrated in fig. 3.Sleeve 302c is in the revolution of the outside of these magnet MG.Multiple magnet MG has formed the magnetic field for making the developer that includes magnetic carrier and toner erect or lodge on the surface of sleeve 302c.The carrier of magnetic has formed magnetic brush after the normal direction magnetic line of force set of these magnet MG transmitting.

In the related developing apparatus 3 of embodiment, employing be the magnetic roller 302d by five set magnet MG with five magnetic poles (magnetic force distribution).On the line of the center 0-2 of developer roll 302 center 01 and photoreceptor, be provided with the P1 utmost point.Taking this P1 utmost point (the N utmost point) as benchmark, rotate direction along inhour and be equipped with the P2 utmost point (the S utmost point), the P3 utmost point (the N utmost point), the P4 utmost point (the N utmost point), the P5 utmost point (the S utmost point).In the figure, be taking developer roll 302 center 01 after benchmark, by the P1 utmost point be disposed in 8 directions of clock face, by the P2 utmost point be disposed in 7 directions of clock face, by the P3 utmost point be disposed in 5 directions of clock face, by the P4 utmost point be disposed in clock face 1 direction, the P5 utmost point is disposed in the position of 10 directions of clock face.Developer roll 302 and photoreceptor 1 are mutually in opposite directions and right developing regional place is separated with the development spacing of regulation between each other.The developer that developer roll 302 erects enters after this development spacing, contacts on one side with photoreceptor 1, mobile on one side.Then, after toner being attached on the electrostatic latent image of photoreceptor 1, be, toner image by latent electrostatic image developing.

On the stationary shaft (302a) of developer roll 302, be connected with development power supply VP.Being applied to development bias voltage stationary shaft from development power supply VP is that bearing (302f) by electric conductivity and the revolving shaft (302e) of electric conductivity were applied in sleeve 302c afterwards.On the other hand, the undermost electric conductivity support 1b of formation photoreceptor 1 is grounded.

In developing regional, at the electrostatic latent image of photoreceptor 1 be applied with between the sleeve 302c of development bias voltage, effect has to form and makes the development current potential of toner from the electric field of sleeve side direction sub-image side shifting.Thus, toner is just transferred on electrostatic latent image after the disengaging of the magnetic carrier from sleeve 302c.

In Fig. 2, although omitted for convenience's sake diagram, image-generating unit has also comprised the optical writing device with LED array etc.Clockwise rotating in the drawings direction, to be turned round the surface of the photoreceptor 1 of driving be negative polarity by Charging system 2 by uniform charged.In this printer, although what adopt as Charging system 2 is by the charged brush roll and the mode that the surface sliding of photoreceptor 1 rubs that are applied with electrical bias, also can adopt corona mode

The light inlet L that writes being launched by not shown optical writing device (Fig. 1 16) by the surface of the photoreceptor 1 after uniform charged comes by after photoscanning, and the current potential of exposure portion has just obtained decay.Thus, exposure portion has just become electrostatic latent image.Namely so-called discharged-area development mode.In the present invention, visualization way is not limited to discharged-area development mode.

In Fig. 3, be accompanied by sleeve 302c revolution and by developing with the developer in territory by conveyance till the position in the repulsion magnetic field between the P4 utmost point (the N utmost point) and the P3 utmost point (the N utmost point).Then, the magnetic force by this repulsion magnetic field after the power of sowing discord from sleeve 302c surface, has just departed from from the surface of sleeve 302c being subject to.Developer after disengaging drops in recovery catalyst reception room 311 by gravity.

It shown in Fig. 5, is the oblique view of supplying agent conveyance screw rod 304 and recovery catalyst conveyance screw rod 305.In addition, shown in Fig. 6, be the exploded perspective view of these screw rods.Supplying agent conveyance screw rod 304 is around revolving shaft, to erect the shape that has the screw shaped after helical blade, and in the direction of arrow, is driven by revolution in the drawings with its axis of rotation posture parallel with the axis of rotation of developer roll (302).Then, be accompanied by this revolution, stirring in developer along axis of rotation conveyance in arrow A direction in the drawings.

As illustrated in fig. 3, supplying agent conveyance screw rod 304 is positioned at the side of developer roll 302, and developer roll 302 makes the P4 utmost point (the N utmost point) that magnetic roller 302d sends arrive the inside of supplying agent reception room 310.A part for developer in supplying agent reception room 310 is just adsorbed on the surface of sleeve 302c by the magnetic force of this P4 utmost point.Then, along with the revolution of sleeve 302c is drawn on the surface of sleeve 302c.In the developer being drawn forms magnetic brush after setting, by sleeve 302c and come in opposite directions by means of fixing gap on the other hand and right developer limiting member 303 between time, the lip-deep bed thickness of sleeve 302c has just obtained restriction.

Between the P4 utmost point in supplying agent reception room 310 and the P1 utmost point in developing regional, have the P5 utmost point.The effect of this P5 utmost point be after the developer that has limited bed thickness by developer limiting member 303 is adsorbed onto on the surface of sleeve 302c conveyance in the position of the P1 utmost point.

The effect that is arranged in the P1 utmost point of developing regional is to contact with photoreceptor 1 after the developer setting making on the sleeve 302c of developing regional.Be accompanied by the revolution of sleeve 302c and developer by developing regional just as described above, by repel magnetic field be used for after the surface of sleeve 302c departs from, drop in recovery catalyst reception room 311.

Developer after the surface of sleeve 302c departs from is all recycled in recovery catalyst reception room 311.Different from the formation of side that recovery catalyst reception room is disposed in to supplying agent reception room, after developing, be that the developer that surface from sleeve 302c can not departed from turn back in supplying agent reception room 310.Therefore, even the image of continuous wave output hi-vision area occupation ratio, because it is upper the developer of the toner concentration of regulation to be supplied to constantly to sleeve 302c always, so just can avoid the generation of image color inequality.

In recovery catalyst reception room 311, as shown in Figure 5, Figure 6, be equipped with recovery catalyst conveyance screw rod 305.This recovery catalyst conveyance screw rod 305 is so that its axis of rotation is arranged along the posture of the axis of rotation of developer roll 302 or the axis of rotation of supplying agent conveyance screw rod 304.Then, the revolution that is accompanied by the direction of arrow of Fig. 5 drives, stirring in developer along the conveyance in arrow B direction in the drawings of axis of rotation direction.That is to say, part is along with the revolution of recovery catalyst conveyance screw rod 305, be with the conveyance direction of supplying agent conveyance screw rod 304 be in the other direction on conveyance developer.

As illustrated in fig. 3, in cavity 301, recovery catalyst reception room 311 be positioned at supplying agent reception room 310 under, and these reception rooms are to separate by the base plate 306 of recovery catalyst reception room 311.But, in supplying agent reception room 310, in the end of the front side of the direction of the paper perpendicular to figure, because base plate 306 is not set, so supplying agent reception room 310 and recovery catalyst reception room 311 are interconnected.

Further, as illustrated in fig. 6, in the inboard end of the direction of the paper perpendicular to figure of base plate 306, on base plate 306, be provided with opening 307.Supplying agent reception room 310 and recovery catalyst reception room 311 also can be interconnected by means of this opening 307.In recovery catalyst conveyance screw rod 305, at the end of downstream side place of developer conveyance direction (arrow B direction in figure), be provided with the upwardly extending stirring vane in axis of rotation side and replace helical blade.This stirring vane has been given the power towards normal direction with respect to developer.By the helical blade of recovery catalyst conveyance screw rod 305, developer is the end of downstream side to the developer conveyance direction of recovery catalyst reception room 311 by conveyance, and by stirring vane by push away.Then, by moving in supplying agent reception room 310 after opening 307.

Directly over opening 307, the stirring vane by recovery catalyst conveyance screw rod 305 upwards rising developer moves after being supplied to the screw rod blade scraping of agent conveyance screw rod 304 in spiral helicine space.Thus, developer is just effectively from recovery catalyst conveyance screw rod 305 is delivered to supplying agent conveyance screw rod 304.

It shown in Fig. 7, is near the sectional view after photoreceptor 1 and developing apparatus 3 being decided what is right and what is wrong the inboard end in the direction of the paper perpendicular to figure.Supplying agent conveyance screw rod 304 center and recovery catalyst conveyance screw rod 305 center are mutually to arrange in vertical direction.When the counter-clockwise in the drawings rotation direction of the stirring vane of recovery catalyst conveyance screw rod 305 upper rotary, along the inwall of cavity 301, developer is gone up.Opening 307 can not hinder the forward march of the developer of this rise, and, for the developer after not making to go up turns back to 305 li of recovery catalyst conveyance screw rods again, be to be formed on than the perpendicular line at center that connects two screw rods to only depend in some position of cavity inner wall side.

Move to developer in supplying agent reception room 310 along with the revolution of supplying agent conveyance screw rod 304 drives, when arrow A direction is by conveyance in the drawings, its part be drawn into the sleeve (302c) of developer roll upper after for developing.Be not drawn on sleeve and by conveyance till in the figure of supplying agent reception room 310 developer of the end of arrow A direction moving to behind the region that there is no base plate 306, drop in recovery catalyst reception room 311.Then the toner of, using with the supply of sending here by the supply mouth 301a being arranged on cavity 301 mixes.

Supply come toner by recovery catalyst conveyance screw rod 305 by conveyance till during near the end of the opposition side of axis of rotation direction, be uniformly mixed fully with developer.Through this being uniformly mixed, the toner concentration of the developer going up to supplying agent reception room 310 by the stirring vane of recovery catalyst conveyance screw rod 305 has been just aimed concn substantially.

The developing apparatus 3 of this formation, by supplying agent reception room 310 and recovery catalyst reception room 311 are arranged on above-below direction, compared with the formation of arranging in the horizontal direction, just has advantages of to realize in the horizontal direction and saves spatialization.

On photoreceptor 1K, the M that K, M in Fig. 1, Y, C use, the surface of Y, C, by the electrofax processing of above-mentioned explanation, K, M, Y, C toner image are just formed.Below image-generating unit 17K, M of all kinds, Y, C, be equipped with transfer printing unit.This transfer printing unit is when the paper using conveyance band 15 of ring-type is set up to roller and carried out tensioning and set up by multiple tensionings, and also inhour is rotated in direction and done around movement in the drawings.It is exactly inlet roller 19, driven roller 18 and four transfer bias roller 5K, M, Y, C specifically that roller is set up in the plurality of tensioning.

Paper using conveyance band 15 by the contraposition roller by postscript to the 23 recording sheet P Electrostatic Absorption of sending to its front.Four transfer bias roller 5K, M, Y, C have been coated the roller after the elastic bodys such as sponge on metal plug, after photoreceptor 1K, the M being used, Y, C pushing, sandwich paper using conveyance band 15 together with photoreceptor towards K, M, Y, C.By this pushing, four transfer printings clampings using with length K, the M, Y, the C that contact of regulation just on moving direction, are formed at four photoreceptor 1K, M, Y, C and paper using conveyance band 15.On the plug of four transfer bias roller 5K, M, Y, C, apply respectively through not shown transfer bias power supply to come by the transfer bias of steady current control.Thus, be endowed transfer printing electric charge by means of four transfer bias roller 5K, M, Y, C at the back side of paper using conveyance band 15, and formed transfer electric field between paper using conveyance band 15 in each transfer printing clamping and photoreceptor 1K, M, Y, C.Further, in this printer, although be provided with transfer bias roller 5K, M, Y, C as transfer means, also can replace roller with brush or plate etc.

In the bottom of printer body, the first paper supply cartridge 22, the second paper supply cartridge 21 and the 3rd paper supply cartridge 20 are arranged as mutually overlapping in vertical direction.The state of the recording sheet bundle after these paper supply cartridges are overlapping with multipage is accommodated recording sheet P, and paper feed roller is conflicted on uppermost recording sheet P.Then, drive after paper feed roller to turn round the opportunity specifying, recording sheet P is passed out in paper supply path.In the way in this paper supply path, be equipped with multiple carrying rollers pair, recording sheet P passes through between the right roller of these carrying rollers on one side successively, is arrived near the end in paper supply path on one side by conveyance.Near the end in paper supply path 53, be equipped with contraposition roller to 23.Contraposition roller turns round driving for the recording sheet P that paper supply cartridge is sent here is clamped between roller to two rollers to 23, but in the time that the tip of recording sheet P is sandwiched, just stops at once the revolution of two rollers to drive.Then, look the accurate synchronous opportunity of Y toner image making on photoreceptor 1Y that transfer printing clamping place K that recording sheet P and K use uses, recording sheet P is sent to transfer printing unit.

This printer, in the time printing full-color image, carries out following printing action.,, in the time receiving the full-color image data of sending here from not shown personal computer of outside etc., just drive paper using conveyance band 15 or four photoreceptor 1K, M, Y, C.Then, in each image-generating unit 17K, M, Y, C, K, M, Y, C toner image are formed on photoreceptor 1K, M, Y, C, and the opportunity of regulation recording sheet P is sent 23 from contraposition roller.Then, when the recording sheet P sending being remained on the front of paper using conveyance band 15, along with band around mobile from figure bottom right after the conveyance of upper left, be sent to successively in the transfer printing clamping that K, M, Y, C use.Thus, the K on photoreceptor 1K, M, Y, C, M, Y, C toner image are transferred to after recording sheet P respectively after transfer printing clamping place is overlapping, just on recording sheet P, have obtained full-color image.Then, the recording sheet P after full-color image is formed sets up position around mobile conveyance to the band tensioning of driven roller 18 along with paper using conveyance band 15.In this band tensioning decorating position, be that the winding angle sharply that makes direction of belt travel be roughly reversion is wound on paper using conveyance band 15 on driven roller 18.By the variation of this moving direction sharply, the recording sheet P that just makes to be adsorbed on paper using conveyance band 15 separates from paper using conveyance band 15, and sends towards fixing device 24.

Fixing device 24 forms photographic fixing clamping by the fixing roller that includes the pyrotoxins such as Halogen lamp LED with the butt that is pushed to the backer roll on it.Be sent to recording sheet P in fixing device 24 heated and pressurization when by this photographic fixing clamping, thus just photographic fixing in its surface toner image.The recording sheet P discharging from fixing device 24 enters in ADF path.Then, through being arranged on ADF path end exit roller to after, by stacking to be arranged on printer framework above stacking portion 25 on.

In Fig. 2, on the surface of the photoreceptor 1 after the transfer printing clamping by paper using conveyance band 15 and photoreceptor 1 butt, can be attached with the transfer printing remaining toner not being transferred on recording sheet.This transfer printing remaining toner is bought clearly device 6 and is removed from the surface of photoreceptor 1 by cleaning balde 601 being connected to the lip-deep drum of photoreceptor 1.Removed after electricity except electric light by not shown by photoreceptor 1 surface after so cleaning, after uniform charged again, removed to prepare image next time by Charging system 2 and form.

It shown in Fig. 8, is the module map of a part for the circuit of the related printer of embodiment.In the figure, controller 712 is made up of the microcomputer of controlling each portion, and can communicate by letter with engine control portion 713.In addition, controller 712 also includes the memory storage of video memory 714 or fontlib 715 etc.In controller 712, be connected with main frame 716 by means of two-way simultaneous interface, controller 712 receives after the delivering letters of image information that comes from main frame 716, carries out the processing of printer function.

In controller 712, be electrically connected with and be subject to coming from the scanner 717 moving after the driving signal of engine control portion 713, the image information being read by scanner 717 is transmitted.Thus, controller 712 just carries out the processing as digital copier by this printer.The controller 712 that carrys out acceptance pattern image signal from main frame 716 or scanner 717 is deployed into them video memory 714, and according to the driving signal of guidance panel 718, control data or data writing is sent to 713 li, engine control portion.At this moment, if picture signal is the text data from main frame 716, be deployed in video memory 714 just as required from the font (font) that it is suitable that fontlib 715 is breathed out, and by the view data (lteral data) of the font according to breathing out.

On the other hand, engine control portion 713 receives and controls the delivering a letter of data or data writing from controller 712, they is driven to control after just driving signal being delivered in the CD-ROM drive motor of the drive source of paper feed or the image-generating unit etc. of this printer, clutch coupling, solenoid valve etc.In addition, also carry out afterwards the output of various bias voltages by driving signal to be imparted to 719 li of high-voltage power circuits.

In engine control portion 713, also connect toner concentration sensor 390K, the M, Y, the C that are formed by magnetoconductivity sensor, detected the toner concentration of the developer in the developing apparatus (3K, M, Y, C) that K, M, Y, C use.The output voltage of 713, engine control portion these toner concentration sensors of pick is held the toner concentration of developer or the measuring voltage △ Vt that checks the mark.

Regardless of the carried charge variation of the K toner in environmental turbulence or developer, in order to obtain stable image color, engine control portion 713 is often to carry out carrying out process control processing regular opportunity of printing etc. of regulation number of pages.Thus, even if imaging capability is because environmental turbulence or toner carried charge change, also the development current potential adjustment as image-forming condition can be obtained to required image color afterwards.In the action opportunity arrival of process control processing, if carrying out when multiple recording sheets is carried out to the continuous print out task of continuous wave output, just supspending implementation process control processing after continuous print out task.

In process control is processed, first, on photoreceptor 1, form multiple sticking patch sub-image of pre-determined sticking patch (patch) shape, and with mutual different development current potential these sticking patch sub-images that develop.Thus, when toner adhesion amount is after the different solid toner image of multiple tests forms on the surface of photoreceptor 1 each other, just these are tested to the greyscale pattern that solid toner image forms and look like to be transferred on the surface of paper using conveyance band 15.The formation of this greyscale pattern picture is to carry out respectively with the of all kinds of K, M, Y, C.

In paper using conveyance band 15, connect the adhesion amount detecting sensor being formed by not shown reflective photoelectric sensor.The front utilizing emitted light of adhesion amount detecting sensor from light-emitting component towards paper using conveyance band 15.Then, by being subject to light original paper to be received in the normal reflection light after normal reflection on the surface of paper using conveyance band 15, or scattered reflection light after scattered reflection.It is to change according to the toner adhesion amount of the solid toner image of test that the normal reflection of adhesion amount detecting sensor is subject to light original paper or scattered reflection to be subject to the output voltage of light original paper.Engine control portion 713, according to these output voltages, holds respectively its toner adhesion amount to the multiple test toner image in greyscale pattern picture of all kinds.

So, after holding toner adhesion amount, carry out respectively following processing to of all kinds.The near linear of relation between the testing result of development current potential (potential difference (PD) of sub-image current potential and development bias voltage) the toner adhesion amount while, asking for respectively development for the solid toner image of multiple tests.Then, determine the development current potential that can obtain required toner adhesion amount in solid toner image according to this near linear, and decide development bias voltage according to definite result.By such process control processing, for the variation that just can suppress respectively the image color causing because of the variation of environment (temperature or humidity) or toner characteristic (mobility or volume density etc.) of all kinds, thereby can form steadily in the long term the image of high-quality.

Then, describe for the formation of the feature of the related printer of present embodiment.It shown in Fig. 9, is the amplification pie graph of supplying agent reception room 310 and recovery catalyst reception room 311.In the axis of rotation direction of two screw members, the base plate that is arranged on opening on the base plate 306 of supplying agent reception room 310 and recovery catalyst reception room 311 in opposite directions and right region is the region of transmitting developer.Be exactly that, by the stirring vane of recovery catalyst conveyance screw rod 305, the developer in recovery catalyst reception room 311 is passed to the region of 310 li of the supplying agent reception rooms of its top specifically.Below, this region is called to developer handover region.In the base plate of recovery catalyst reception room 311, in the position of upstream side of being partial to slightly developer conveyance direction than developer handover region, fix the toner concentration sensor 390 being formed by magnetoconductivity sensor.

After the printer testing machine that the present inventors state formation is in the use tested, find following phenomenon.It shown in Figure 10, is the graph of a relation of the speed of gyration of screw member (304,305) and the output voltage of toner concentration sensor 390.This figure is that the experiment of carrying out according to the present inventors is made.As shown in the figure, if the toner concentration of developer is identical, so, along with accelerating of the speed of gyration of screw member, the output voltage of toner concentration sensor 390 can reduce.It is the reasons are as follows.,, along with the speed of gyration of screw member accelerates, developer is just shifted onto in supplying agent reception room 310 from recovery catalyst reception room 311 is interior well by the stirring vane of recovery catalyst conveyance screw rod 305.Consequently, in recovery catalyst reception room 311, after the amount of the developer of (hereinafter referred to as sensing station) reduces near toner concentration sensor 390, just caused the decline of magnetic permeability.

When cause by sleeve 302c, the quantitative change of drawing of developer being obtained when less because of the mobility of toner, so, even if contain enough developers in supplying agent reception room 310, these developers can not be drawn well by sleeve 302c.Therefore, the developer from supplying agent reception room 310 turns back to recovery catalyst reception room 311 will increase.Under this state, be after the actuating speed of developing apparatus 3 is slowed down, reduce the speed of gyration of sleeve 302c, supplying agent conveyance screw rod 304 and recovery catalyst conveyance screw rod 305 (below they being called altogether to " development revolving member ").So, by the stirring vane of recovery catalyst conveyance screw rod 305, just reduce from the interior amount of being shifted onto the developer in supplying agent reception room 310 of recovery catalyst reception room 311.Then, in recovery catalyst reception room 311, near the magnetic that toner concentration sensor 390, (hereinafter referred to as sensing station) exists is cut out after the amount increase of body, and the output voltage of toner concentration sensor 390 just rises.Check the mark (hereinafter referred to as the output difference △ Vt) of the output voltage of the toner concentration sensor 390 before and after the speed of gyration of " development revolving member " is switched will become larger.

On the other hand, when cause by sleeve 302c, the quantitative change of drawing of developer being obtained when more because of the mobility of toner, reducing after the speed of gyration of " develop and use transfer member ", just reducing the amount of the developer in recovery catalyst reception room 311 is shifted supplying agent reception room 310 onto.Then,, after the amount of the magnetic carrier at the sensing station place in recovery catalyst reception room 311 increases, the output voltage of toner concentration sensor 390 just rises.But when the quantitative change of drawing of developer obtains when more, sleeve 302c will draw more developer, and returns to more developer in recovery catalyst reception room 311 from sleeve 302c.Thus, before reducing the speed of gyration of " development revolving member ", because sensing station place has more magnetic carrier, just can not be very large so reduce the recruitment of the output voltage after speed of gyration.Therefore, obtain compared with less situation with the quantitative change of drawing of developer, output difference △ Vt just diminishes.

Shown in Figure 11, be that output difference △ Vt and sleeve 302c are to the graph of a relation between the amount of drawing of developer.As described above, accommodating of the developer in the amount of drawing of developer and supplying agent reception room 310 has correlationship between height.As shown in the figure, if identical toner concentration, so, the amount of drawing of developer is more, exports difference △ Vt less.This means, the amount of drawing of the developer before the speed of gyration of " development revolving member " being switched to low speed is more more, exports difference △ Vt less.

Thus, under the state of idle running developing apparatus 3, measure output difference △ Vt by the actuating speed of developing apparatus 3 being switched to more in low speed when, just can infer the amount of drawing of the developer before switching.For example, in the time driving developing apparatus 3 with middling speed, when obtaining the output voltage of toner concentration sensor 390 and calculating the toner concentration of developer according to this result, what obtain is 4%.Then, after developing apparatus 3 is dallied by actuating speed from middling speed is switched to low speed, measuring while calculating output difference △ Vt after the output voltage of toner concentration sensor 390, that obtain is 1.0V.At this moment it is approximately 44mg/cm that the amount of drawing of, switching the developer before actuating speed just can be estimated as from Figure 11 ².

In this printer, by carrying out above-mentioned process control processing, just can obtain stable image color.But, even carried out process control processing, if cause sleeve 302c to obtain when more the quantitative change of drawing of developer because of the mobility of toner, will easily cause line dust.Therefore,, when the quantitative change of drawing of developer obtains when more, for line image, suppress occuring as of line dust to reduce development current potential.

In addition, while making development current potential in line image be greater than solid image portion, when the mobility of toner causes sleeve 302c, the quantitative change of drawing of developer is obtained when less in order to suppress the generation of line dust, the toner adhesion amount of line image portion is not enough.Thus, line will occur attenuates.

So engine control portion 713, after carrying out process control processing, carries out writing intensity adjustment processing as image-forming condition adjustment processing at once.Writing during intensity adjustment processes at this, is that K, M, Y, C of all kinds carried out respectively to following processing., be first to drive developing apparatus 3 or photoreceptor 1 with common speed, and under the state of idle running developing apparatus 3, obtain the output voltage of toner concentration sensor 390.Then, calculate the toner concentration of developer according to the algorithm of relation between the demonstration output voltage of prior storage and toner concentration.

Then, engine control portion 713, after using above-mentioned output voltage, before switching, voltage Vt1 stores, is switched to the actuating speed of developing apparatus 3 in low-speed mode.Thus, by " development revolving member " with after more low speed turns round, just using the output voltage of the toner concentration sensor after the stipulated time 390 as switch after voltage Vt2 obtain.Then, the voltage Vt2 from switching deducts before the switching of prior storage after voltage Vt1, differ from as exporting difference △ Vt.

Shown in following table 1, be toner concentration and output difference △ Vt and draw relation range degree between of sleeve 302c to developer of developer.This table 1 is that the experiment of carrying out according to the present inventors is made.

Table 1

1: the amount of drawing is less

2: the amount of drawing is suitable

3: the amount of drawing is more

In table 1,1 numerical value represents that the amount of drawing of developer is less.In addition, the amount of drawing that 2 numerical value represents developer is near appropriate value.In addition, 3 numerical value represents that the amount of drawing of developer is more.If toner concentration is identical, so, the amount of drawing of the less developer of output difference △ Vt is just more.

After engine control portion 713 has measured toner concentration and output difference △ Vt as described above, just according to them and the tables of data of the table 1 of storing in advance, which in 1-3 be the amount of drawing of determining developer be.Then, in the time that the amount of drawing of developer is " 3 " (more), just by control optical writing device 16 LED power (to the supply electric power of LED) that the light of line image portion is write to intensity be set to by force, in, " weak " of weak etc. 3 grades be inner.Thus, for line image portion, come compared with solid image portion, write intensity (minimizing light quantity) and make the current potential of electrostatic latent image larger by weakening the light of electrostatic latent image.Then, make to act on development current potential between electrostatic latent image and the sleeve 302c of line image portion and be less than the development current potential between electrostatic latent image and the sleeve 302c that acts on solid image portion.Thus, by making the toner adhesion amount of line image portion drop to the degree identical with the toner adhesion amount of solid image portion, suppress the line dust that the amount of drawing of developer occurs when more.

In addition, in the time that the amount of drawing of developer is " 2 " (suitably), engine control portion 713 just by control LED power setting that optical writing device 16 writes intensity to the light of line image portion to identical with solid image portion " in " inner.Thus, making the light of the electrostatic latent image in line image portion and solid image portion write intensity is same degree.

In addition, in the time that the amount of drawing of developer is " 1 " (less), engine control portion 713 is just inner to " by force " by controlling the LED power setting that optical writing device 16 writes intensity to the light of line image portion.Thus, for line image portion, come compared with solid image portion, write intensity (increase light quantity) and make the current potential of electrostatic latent image less by strengthening the light of electrostatic latent image.Then, make to act on development current potential between electrostatic latent image and the sleeve 302c of line image portion and be greater than the development current potential between electrostatic latent image and the sleeve 302c that acts on solid image portion.Thus, increase by the toner adhesion amount that makes line image portion, suppress the line that the amount of drawing of developer occurs when less and attenuate.

Further, although be described for carry out at once the example that writes intensity adjustment processing after process control is processed, also can be in the time of common print out task switch line speed in the situation that, output difference △ Vt mensuration was write to intensity adjustment processing afterwards.

Boundary effect is not only line image portion, also can occur on the border of solid image.If the amount of drawing of developer just increases slightly, in the border of solid image portion, be that transfer printing dust can not occur so.But, when the amount of drawing increases when a lot of, just likely near the border of solid image portion, cause transfer printing dust.So, engine control portion 713 be not only the electrostatic latent image of line image portion is carried out light write fashionable, the electrostatic latent image on the border to solid image portion carry out light write fashionable, identical when also making LEtD power with line image portion.At this moment, for the each pixel that forms solid image portion, be, whether that the pixel on border is as the judgement of getting off., shown in Figure 12, be the mode chart of a part for the picture element matrix of page.This picture element matrix is the picture element matrix in a part of region of page in all.In this picture element matrix, the pixel of blacking is the recording pixel that adheres to form point diagram (dot) by toner.In addition, the pixel of hollow is the non-recording pixel that does not form the point diagram that toner adheres to.In addition, the x direction in figure is main scanning direction (photoreceptor axis direction).In addition, the y direction in figure is sub scanning direction (photosensitive surface moving direction).

Among each pixel of engine control portion 713 from picture element matrix, when by gazing at of having in mind, pixel staggers singly on sub scanning direction, if while gazing at pixel and be a some recording pixel, just this recording pixel is judged whether to be present in the border of solid part.Then,, if be present in the recording pixel in border, just this recording pixel recorded with the LED power identical with the situation of solid image portion and carries out the information that light writes.To gaze at pixel shift after sub scanning direction rearmost end, just, in the 1 each pixel that only staggered to main scanning direction in the position of gazing at pixel, be moved in the initial position of sub scanning direction., then carry out same judgement then.So,, after decision LED power, start to carry out light and write processing for all recording pixels.

About judging whether it is the recording pixel being present in border, be that the whether non-recording pixel of pixel existing respectively according to the neighbourhood, left and right of the main scanning direction of this recording pixel carries out.The pixel existing as neighbourhood, left and right is while being non-recording pixel respectively, is just judged as in the border that is present in solid image portion for the recording pixel of having in mind.In addition, just judgement is not to be present in the border of solid image portion.

In the figure, while being conceived to the recording pixel of L1C2, because the adjacent pixel in its left and right is respectively recording pixel, so just judge that the recording pixel of L1C2 is not to be present in border.In addition, while being conceived to the recording pixel of L262, because its right neighbour's pixel is recording pixel, so just judge that the recording pixel of L262 is not to be present in border.In addition, while being conceived to the recording pixel of L3C2, because its left neighbour's pixel is recording pixel, so just judge that the recording pixel of L302 is not to be present in border.In addition, while being conceived to the recording pixel of L4C2, because the adjacent pixel in its left and right is all non-recording pixel, so just judge that the recording pixel of L4C2 is to be present in border.

Judge whether it is to be present in the border of solid image portion for the recording pixel of having in mind, be not limited to above-mentioned method.Also can be to judge whether to be present in border according to the upper and lower pixel of the recording pixel of having in mind.

It shown in Figure 13, is the mode chart of the second case of the picture element matrix of page.For the recording pixel of having in mind, also can judge whether to be as described below present in the border of solid image portion.; in the one party of the left and right of the recording pixel of having in mind, if recording pixel has continuously two on a side main scanning direction, and in the opposing party; non-recording pixel has two consecutive hourss on main scanning direction, is just judged as in the border that is present in solid image portion.In addition, just judgement is not to be present in the border of solid image portion.

In the example shown in Figure 13, for each pixel of C3 row, possess recording pixel in the one party of left and right have two continuous time also in the opposing party non-recording pixel have two continuous conditions, only have the recording pixel of L6C3 and the recording pixel of L8C3.Thus, among each pixel of C3 row, be judged as in the border that is present in solid image portion, just only have this two recording pixels.

It shown in Figure 14, is the mode chart of the first case of the state of each pixel around of border for solid image portion is described and the relation of electric field intensity.In the figure, shown in quadrilateral shape, be non-recording pixel.In addition, shown in blacking quadrilateral, be recording pixel.In addition, the numerical value that the below of each pixel is recorded is the ratio of each recording pixel being carried out to light and writes fashionable LED power.This ratio taking in try to achieve as benchmark.In illustrated example, have four non-recording pixels, the LED power of each non-recording pixel is 0%.This is because do not carry out for non-recording pixel the reason that light writes.In addition, in illustrated example, have five recording pixels, each recording pixel be with in LED power come that light writes 100%.

In the figure, the border of non-image portion and solid image portion is the border of the 4th non-recording pixel and the 5th recording pixel from left to right.Around this border, the electric field intensity of non-image portion compared with common be grow in the direction of repulsion toner.Be exactly specifically, in illustrated example, represent that side shifting is more descended in the position of the figure line of electric field intensity in figure, electric field intensity more strengthens in the direction of repulsion toner.Second non-recording pixel or although the current potential of the 4th non-recording pixel is all identical with bottom surface sections current potential from left to right from left to right in figure, but the electric field intensity of the latter's non-recording pixel in the direction of repulsion toner is eager to excel.

In addition, around above-mentioned border, the electric field intensity of image portion compared with common be to attract grow in the direction of toner.Be exactly specifically, in illustrated example, represent that the position of figure line of electric field intensity is more to upper side shifting in figure, electric field intensity more strengthens in the direction that attracts toner.The 5th recording pixel or although the current potential of the 7th recording pixel is all identical with sub-image current potential from left to right from left to right in figure, but the electric field intensity of the former recording pixel in the direction that attracts toner is eager to excel.So, near on above-mentioned border, when the electric field of non-image portion is stronger in the direction of repulsion toner, the electric field of image portion is stronger in the direction that attracts toner, and this phenomenon is exactly boundary effect.

It shown in Figure 15, is the mode chart of the first case of the state of each pixel around of border for solid image portion is described and the relation of electric field intensity.In the figure, the non-recording pixel on the left side or from left to right the LED power in second non-recording pixel be 0%., not carrying out light for non-recording pixel writes.With respect to this, the LED power in the 3rd non-recording pixel is 5% from left to right.In addition, the LED power in the 4th non-recording pixel is 10% from left to right.That is to say, be to have carried out a small amount of light to write for these two recording pixels.These two recording pixels compared with the left side or from left to right second recording pixel come because near existence image portion, thus just easily effect have boundary effect.

In addition, in the figure, the LED power in the 5th recording pixel is 80% from left to right.This recording pixel is just judged as and is present in border.In addition, the LED power in the 6th recording pixel is from left to right 95%.This recording pixel is just judged as and is not present in border, be but the side that is present in recording pixel, and this recording pixel is present in border.

As shown in the figure, in the non-image portion around above-mentioned border, the non-recording pixel existing near above-mentioned border, in the condition that increases LED power, carries out very weak light and writes.And on the other hand, in the image portion around above-mentioned border, the recording pixel existing near above-mentioned border, carries out light in the condition that reduces LED power to write fashionablely, non-image portion, image portion can both weaken boundary effect.

So, engine control portion 713 with respect to the non-recording pixel of above-mentioned border adjacency, be with in the LED power of 10% degree carry out processing that light writes.In addition, with respect to the non-recording pixel of this non-recording pixel adjacency, be with in the LED power of 5% degree carry out processing that light writes.In addition, with respect to the recording pixel of above-mentioned border adjacency, be to carry out with the LED power identical with line image portion processing that light writes.In addition, with respect to the recording pixel of this recording pixel adjacency, be to carry out with the LED power slightly stronger than described LED power processing that light writes.Process by carrying out these, just can effectively reduce near the boundary effect in above-mentioned border, thereby can suppress near the generation of transfer printing dust border.Further, near the non-recording pixel above-mentioned border, can be also to carry out very weak light to write after the countermeasure that such non-image portion just has, further suppress transfer printing dust.

Although for example understand that above the toner adhesion amount of the electrostatic latent image on the border of electrostatic latent image to line image of adjustment by LED power or solid image portion adjusts, the light a lamp light of time of the LED that also can adjust each pixel writes load (duty) and replaces LED power.

Above explanation is an example, in the present invention's variety of way below, all has distinctive effect.

[mode A]

One is provided with the image processing system of imaging mechanism (for example image-generating unit 17), described imaging mechanism includes sub-image bearing member (for example photoreceptor 1), write mechanism's (for example optical writing device 16) with the sub-image that sub-image is write to described sub-image bearing member, and the developing mechanism (for example developing apparatus 3) of the sub-image that develops on described sub-image bearing member, described developing mechanism comprises: developer carrier body (for example developer roll 302), and it develops after described sub-image and obtains toner image with being positioned in self lip-deep developer; Supplying agent reception room (for example supplying agent reception room 310), accommodate for being supplied to the developer on described developer carrier body its side of putting body in described developer sanction; Supplying agent conveyance member (for example supplying agent conveyance screw rod 304), its revolution along with self drives another distolateral conveyance of one end side direction from axis of rotation by the developer in described supplying agent reception room; Recovery catalyst reception room (for example recovery catalyst reception room 311), it is provided in the below of described supplying agent reception room, and accommodates the developer of retrieving from described developer carrier body in acceptance; Recovery catalyst conveyance member (for example recovery catalyst conveyance screw rod 305), its revolution along with self drives the developer in described recovery catalyst reception room is delivered to described supplying agent reception room from the distolateral conveyance of other end side direction one of axis of rotation, it is characterized in that comprising, toner concentration testing agency (for example toner concentration sensor 390), it detects the toner concentration of the developer in described recovery catalyst reception room; Control gear (for example engine control portion), the output of its described toner concentration testing agency when driving described developer carrier body, described supplying agent conveyance member and described recovery catalyst conveyance member with fixing speed, with the difference of the output of the described toner concentration testing agency when driving lower than the speed of described fixing speed, adjust the image-forming condition adjustment processing of the image-forming condition of described imaging mechanism.

[mode B]

Mode B is according to mode A, it is characterized in that: described supplying agent reception room for example, is arranged with the upper posture of extending of moving orthogonal direction (axis of rotation direction) of the surperficial moving direction perpendicular to described developer carrier body, and along with axis of rotation is driven with the revolution of the described supplying agent conveyance member that arranges along the posture of described moving orthogonal direction, another distolateral conveyance of one end side direction by the developer in described supplying agent reception room from described moving orthogonal direction, and, by described recovery catalyst reception room to arrange in the upwardly extending posture in described moving orthogonal side, and along with axis of rotation is driven with the revolution of the described recovery catalyst conveyance member that arranges along the posture of described moving orthogonal direction, the distolateral conveyance of other end side direction one by the developer in described recovery catalyst reception room from described moving orthogonal direction.

[mode C]

Mode C, according to mode A or B, is characterized in that: as image-forming condition, described control gear is configured to the sub-image write time that the sub-image that described sub-image is write to mechanism writes intensity or a pixel and adjusts.

[mode D]

Mode D, according to mode C, is characterized in that: described control gear is configured to, when described difference more hour, just strengthen the processing that described sub-image writes intensity or extends the described sub-image write time.

[mode E]

Mode E, according to mode D, is characterized in that: in the Zone Full of image, only for line image portion, described control gear is configured to, when described difference more hour, just strengthen the processing that described sub-image writes intensity or extends the described sub-image write time.

[mode F]

Mode F is according to mode E, it is characterized in that: beyond described line image portion, border for solid image portion is also configured to described control gear, when described difference more hour, just strengthen the processing that described sub-image writes intensity or extends the described sub-image write time.

[mode G]

Any one in mode G root pick mode C-F, it is characterized in that: for the non-image portion of the border adjacency of image, described control gear is configured to, writes mechanism by described sub-image and write intensity and carry out the processing writing to be weaker than the sub-image of image portion.

The basis of present patent application and priority request are on 03 07th, 2013, in the Jap.P. of Japan Office's application, ask JP2013-045335, and its full content draws do combination at this.

Claims (7)

1. one kind is provided with the image processing system of imaging mechanism, described imaging mechanism includes sub-image bearing member, write mechanism with the sub-image that sub-image is write to described sub-image bearing member, and the developing mechanism of the sub-image that develops on described sub-image bearing member, described developing mechanism comprises:

Developer carrier body, it develops after described sub-image and obtains toner image with being positioned in self lip-deep developer;

Supplying agent reception room, accommodate for being supplied to the developer on described developer carrier body its side at described developer carrier body;

Supplying agent conveyance member, its revolution along with self drives another distolateral conveyance of one end side direction from axis of rotation by the developer in described supplying agent reception room;

Recovery catalyst reception room, it is provided in the below of described supplying agent reception room, and accommodates the developer of retrieving from described developer carrier body in acceptance;

Recovery catalyst conveyance member, its revolution along with self drives the developer in described recovery catalyst reception room is delivered to described supplying agent reception room from the distolateral conveyance of other end side direction one of axis of rotation,

It is characterized in that comprising,

Toner concentration testing agency, it detects the toner concentration of the developer in described recovery catalyst reception room;

Control gear, the difference of the output of the output of its described toner concentration testing agency when driving described developer carrier body, described supplying agent conveyance member and described recovery catalyst conveyance member with fixing speed and the described toner concentration testing agency when driving lower than the speed of described fixing speed, adjusts the image-forming condition adjustment processing of the image-forming condition of described imaging mechanism.

2. image processing system according to claim 1, is characterized in that:

Described supplying agent reception room is arranged with the upwardly extending posture in moving orthogonal side of the surperficial moving direction perpendicular to described developer carrier body,

And along with axis of rotation is driven with the revolution of the described supplying agent conveyance member that arranges along the posture of described moving orthogonal direction, another the distolateral conveyance of one end side direction by the developer in described supplying agent reception room from described moving orthogonal direction, and,

By described recovery catalyst reception room to arrange in the upwardly extending posture in described moving orthogonal side,

And along with axis of rotation is driven with the revolution of the described recovery catalyst conveyance member that arranges along the posture of described moving orthogonal direction, the distolateral conveyance of other end side direction one by the developer in described recovery catalyst reception room from described moving orthogonal direction.

3. image processing system according to claim 1 and 2, is characterized in that:

Described control gear is configured to, and as image-forming condition adjustment processing, the sub-image that described sub-image is write to mechanism writes the sub-image write time of intensity or a pixel and adjusts.

4. image processing system according to claim 3, is characterized in that:

Described control gear is configured to, when described difference more hour, just strengthen the processing that described sub-image writes intensity or extends the described sub-image write time.

5. image processing system according to claim 4, is characterized in that:

Described control gear is configured to, in the Zone Full of image, only for line image portion, when described difference more hour, just strengthen the processing that described sub-image writes intensity or extends the described sub-image write time.

6. image processing system according to claim 5, is characterized in that:

Also described control gear is configured to, beyond described line image portion, for the border of solid image portion, when described difference more hour, just strengthen the processing that described sub-image writes intensity or extends the described sub-image write time.

7. according to the image processing system described in any one in claim 3 to 6, it is characterized in that:

Described control gear is configured to, for the non-image portion of the border adjacency of image, write mechanism by described sub-image and write intensity and carry out the processing writing to be weaker than the sub-image of image portion.