CN101424900B - Image forming apparatus and image forming method - Google Patents
Image forming apparatus and image forming method Download PDFInfo
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- CN101424900B CN101424900B CN2008101739388A CN200810173938A CN101424900B CN 101424900 B CN101424900 B CN 101424900B CN 2008101739388 A CN2008101739388 A CN 2008101739388A CN 200810173938 A CN200810173938 A CN 200810173938A CN 101424900 B CN101424900 B CN 101424900B
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Abstract
An image forming apparatus and method which can take a countermeasure against a tail or the like in consideration of differences of various conditions such as a kind of transfer paper and the like is provided. The apparatus has an image processing portion for extracting an image pattern whose image information has a concentration of 100% and executing a thin-out process for thinning out a predetermined area in the extracted image pattern at a predetermined ratio. The image processing portion or step changes the thin-out process according to the transfer paper kind.
Description
Technical field
The present invention relates to use the image processing system and the image forming method of Electronic Photographing Technology, more particularly, relate to the mechanism that is used for tackling the defective that in the photographic fixing step of the fusing toner image of image forming course, occurs.
Background technology
So far, the laser beam printer as image processing system of use Electronic Photographing Technology (below, be also referred to as LBP) be used.
In LBP, photosensitive drums is charged equably by charging (charging) roller.Then, scanner comes modulating lasering beam based on the picture signal that comprises the data of the print job that sends from principal computer intensity is formed at electrostatic latent image on the photosensitive drums thus.Toner is deposited on the electrostatic latent image on the photosensitive drums by developer roll, forms toner image thus.Toner image on the photosensitive drums is transferred on the transfer materials by transfer roll.Then, the toner image on the transfer materials passes travelling belt, fixing roller and pressurization (pressing) roller and becomes permanent photographic fixing image.Transfer materials is laminated on the pallet by the discharging roller.
In common printer, as Fig. 8 and shown in Figure 9, when output along the rectilinear of main scanning direction as 1302 the time, following problem can appear.Promptly, in the photographic fixing step, there is a kind of like this problem, promptly, in the line image of the toner image on being visualized as transfer materials 1301, toner disperses (scatter) at the trailing edge (being also referred to as the downstream along sub scanning direction) along sub scanning direction, makes image multilated (this phenomenon is called as " hangover (tail) " shown in 1303 among the figure).
The reason that this phenomenon occurs is, because the unexpected intensification in the photographic fixing step and the pressure of fixing device (fixing roller 1209a and backer roll 1209b), moisture in the transfer materials (moisture) is evaporated in the mode of outburst, the trailing edge of steam (steam) a little less than the strength comes out, simultaneously, toner also disperse (Fig. 9).Usually, between hangover and toning dosage, there is correlationship.Toning dosage is big more, then is easy to occur hangover more.
There is shift phenomenon in another image deflects as occurring in this printer.Shift phenomenon is, when the toner image of non-photographic fixing during by the fixing device photographic fixing, toner image is electrostatically transferred on the fixing roller 1209a, and, toner image by photographic fixing to another part of transfer materials 1301 and become migrated image.Equally, about shift phenomenon (following also be called for short skew), with the similar mode of hangover, toning dosage is big more, then is easy to occur skew more.
As the method that addresses this is that, for example,, there is the method that also reduces toning dosage with predetermined ratio desalination (thin out) image-region part as disclosed among the Japanese Patent Application Publication No.2000-175029.
Summary of the invention
But, according to above correlation technique, no matter how all to carry out the desalination processing such as the difference of the condition of transfer materials type and environment etc.Therefore, if exist transfer materials to change or environment for use difference then trail and the different situation of generating capacity of skew.
Especially, under metal film the situation as fixing member of fixing device use such as SUS, the difference typical case of above-mentioned transfer materials type shows as the difference of hangover or skew.
Describe above phenomenon in detail with reference to Figure 10 and Figure 11.
Figure 10 illustrates the film heating and the fixing device of the resin molding of use such as PI.Annular resin film 1401a is shown in the drawings, such as the well heater 1403 of pottery, be used to support heater support (holder) 1402a, backer roll 1209b and the transfer materials 1301 of well heater.In this fixing device, reduce hangover by following method.That is, by giving prominence to the part by the upstream side of the heater support 1402a in the A part of the encirclement of the broken circle among the figure, resin molding 1401a and transfer materials 1301 are in contact with one another in the position of clamping (nip) part front.Therefore, toner reduces with certain degree fusing (preheating) and hangover in the position of retained part front.If use this heater support shape, there is the very little part of curvature of film so in the upstream of retained part.But because the rigidity of resin molding 1401a is little, therefore, even curvature reduces, the use resin molding also can be no problem.
But, under situation about using, if the curvature of film reduces, so because the metal fatigue that the bending in this part causes causes crackle such as the metal film of SUS.Therefore, under the situation of using metal film, owing to can not use the heater support shape that is used for resin molding 1401a, therefore must use the repressed heater support shape of curvature of the upstream of retained part as shown in the B part of surrounding by the broken circle among Figure 11.Therefore, under the situation of using metal film 1401b, can not reduce since the position of retained part front preheat the hangover that causes.As mentioned above, under the situation of using metal film 1401b, the hangover that obtains as fixing device reduces effect and reduces, and the hangover level changes greatly according to the variation of transfer materials and environment.
Endless metal film shown in Figure 11 (metal tape) 1401b, such as the well heater (sliding component) 1403 of pottery, be used to support heater support (supporting member) 1402b, backer roll (pressing element) 1209b and the transfer materials 1301 of well heater.Metal film 1401b is the metal tape that thickness is about 30 μ m, and rotates along the outward flange of heater support 1402b relatively with the rotation of backer roll 1209b.At this moment, between well heater 1403 and backer roll 1209b, form retained part by metal film 1401b.In retained part, apply heat from well heater 1403 to the transfer materials 1301 that transmits by metal film 1401b, and, by the pressure photographic fixing transfer materials in the retained part.
The present invention proposes by considering above each point, and its intention is to provide the difference that can consider the transfer materials type to eliminate image processing system and image forming method about the defective of image such as the hangover that occurs in the photographic fixing step.Image processing system of the present invention and image forming method provide following structure.
A kind of image processing system, this image processing system has and is suitable for thus electrostatic latent image being formed at exposed portion on the image bearing member based on the image information exposure image bearing member by the live part charging, with the development part that is suitable for forming thus visual picture by the electrostatic latent image that toner development is formed by exposed portion, and, in this image processing system, top transfer printing the transfer paper of the visual picture that divide to form by development section be sent to the photographic fixing part, and, by photographic fixing part visual picture by heat and pressure by photographic fixing to transfer paper, this image processing system comprises: extract part, be suitable for extracting along the x wire image information of the x wire image of main scanning direction extension from image information; Control section, be suitable for controlling the luminous quantity of exposed portion, with the amount of control, so that prevent and the moisture that in transfer paper, comprises dispersing at the evaporation during partly by photographic fixing is relevant by photographic fixing based on the x wire image of x wire image information toner based on the toner that develops by the x wire image information of extracting extracting section; With the acquisition part, the sheet type information of the type of transfer paper by photographic fixing part photographic fixing x wire image above being suitable for obtaining representing, wherein, control section is differently carried out the control of luminous quantity according to sheet type information, so that prevent dispersing of the toner relevant with the evaporation of the moisture that comprises in transfer paper.
A kind of image forming method that is used for image processing system, this image forming method has and is used for thus electrostatic latent image being formed at exposure-processed on the image bearing member based on the image information exposure image bearing member by the live part charging, with the development treatment that is used for forming thus visual picture by the electrostatic latent image that toner development is formed by exposure-processed, and, in this image forming method, top transfer printing the transfer paper of the visual picture that forms by development treatment be sent to the photographic fixing part, and, by photographic fixing part visual picture by heat and pressure by photographic fixing to transfer paper, this image forming method comprises: extract along the x wire image information of the x wire image of main scanning direction extension from image information; Luminous quantity in the control step of exposure, the amount of the toner that develops based on the x wire image information of extracting by extraction step with control is so that prevent and the moisture that comprises in transfer paper dispersing at the evaporation during partly by photographic fixing is relevant by photographic fixing based on the x wire image of x wire image information toner; Sheet type information with the type that obtains above the representative transfer paper by photographic fixing part photographic fixing x wire image, wherein, controlled step is differently carried out the control of luminous quantity according to sheet type information, so that prevent dispersing of the toner relevant with the evaporation of the moisture that comprises in transfer paper.
According to the present invention, can consider the defective about image of difference elimination such as the hangover that in the photographic fixing step, occurs of transfer paper type.
By the following explanation of reference accompanying drawing to exemplary embodiment, it is obvious that further feature of the present invention will become.
Description of drawings
Fig. 1 is the block diagram that illustrates according to the structure of image processing system of the present invention.
Fig. 2 is the diagrammatic sketch that the tabulation of handling according to the desalination in the image processing system of the present invention is shown.
Fig. 3 is the diagrammatic sketch that is illustrated in according to the image information that obtains after the Flame Image Process in the image processing system of the present invention.
Fig. 4 is the process flow diagram that illustrates according to the flow process of the image processing operations in the image processing system of the present invention.
Fig. 5 is the form that the desalination ratio of handling according to the desalination in the image processing system of the present invention is shown.
Fig. 6 is the diagrammatic sketch that the tabulation of handling according to the desalination in the image processing system of the present invention is shown.
Fig. 7 is the schematic cross section of conduct according to the laser beam printer (LBP) of image processing system of the present invention.
Fig. 8 is the diagrammatic sketch of the conditions of streaking in the image processing system that illustrates in the correlation technique.
Fig. 9 is the reduced graph that mechanism appears in the conditions of streaking in the image processing system that illustrates in the correlation technique.
Figure 10 is the film heating of the use resin molding in the correlation technique and the schematic cross section of fixing device.
Figure 11 is the film heating of the use metal film in the correlation technique and the schematic cross section of fixing device.
Embodiment
Hereinafter with reference to Fig. 1 to 7 explanation each exemplary embodiment of the present invention.But disclosed in an embodiment inscape is illustrated as an example, and scope of the present invention is not limited only to these inscapes.
(embodiment 1)
At first, with reference to Fig. 1 to 4 and Fig. 7 the first embodiment of the present invention is described.
Fig. 7 illustrates the vertical side sectional view of conduct according to the schematic configuration of the laser beam printer (LBP) of image processing system of the present invention.
Photosensitive drums 1202 (image bearing member) is charged equably by charging roller 1213 (charhing unit).Then, based on the picture signal (being also referred to as image information) that the data of the print job that sends from the principal computer (not shown), comprises, the intensity of scanner 1201 (exposing unit) modulating lasering beam is formed at electrostatic latent image (on image bearing member) on the photosensitive drums 1202 thus.Toner is deposited on the electrostatic latent image on the photosensitive drums 1202 by developer roll 1214 (developing cell), forms toner (developer) image (visual picture) thus.
Take in transfer materials in (enclosing) box 1203 and be fed roller 1204 and pick up one by one, and, write and regularly be aligned roller (registration roller) 1205 and 1206 and adjust.Though a receiver (being also referred to as sheet material feeding box or sheet material feeding pallet etc.) only is shown, in fact in advance a plurality of receivers of attached various types of transfer materials of having packed in the laser beam printer main body among the figure.
Toner image on the photosensitive drums 1202 is transferred on the transfer materials by transfer roll 1207.Then, the toner image on the transfer materials passes travelling belt 1208, fixing roller 1209a and backer roll 1209b, and becomes permanent photographic fixing image.Transfer materials is laminated on the pallet 1212 by discharging roller 1210 and 1211.
Fig. 1 illustrates the block diagram of conduct according to the structure of the LBP of the image processing system of the first embodiment of the present invention.In the drawings, image processing system has laser beam printer 10 (below, abbreviate printer as) and produces the principal computer 20 in source as image information.
The operation process of CPU40 and character pattern etc. have been stored in the primary memory 42.Bit image memory 50 is storeies of the dot image of deployable (develop) one page that will be printed.Graphics processing unit 60 and is a latent structure of the present invention for the image information carries out image processing of input, will be explained below its details.Printer Engine 70 prints images onto (to transfer paper) on the transfer materials.As has been described in Figure 7, suppose the various types of members that in Printer Engine 70, comprise such as scanner 1201, photosensitive drums 1202, developer roll 1214, fixing roller and backer roll.In order to control various types of members, also be provided for the CPU of Printer Engine 70 for Printer Engine 70.
Though following processing for example is by such as an execution in the member of graphics processing unit 60 and CPU40, the part in the processing of CPU40 can be carried out by graphics processing unit 60.Part or all of the processing of graphics processing unit 60 can be carried out by CPU40 or as the ASIC (special IC, Application Specific IntegratedCircuit) that special circuit is provided with.
Fig. 2 illustrates the tabulation of handling according to the desalination of transfer materials type and picture pattern.Information has been stored in the graphics processing unit 60 among Fig. 1 of above explanation shown in figure 2, and before the processing shown in the process flow diagram of Fig. 4 that execution will be explained below by graphics processing unit 60 references.Perhaps, information can be stored in the nonvolatile memory (not shown in figure 1) shown in figure 2, and by graphics processing unit 60 references.
In Fig. 2, desalination is handled according to the transfer materials type with picture pattern and different, and each Flame Image Process pattern comprises the x wire image as the target of desalination processing.A kind of like this processing of expression is handled in desalination, that is, when making the latent electrostatic image developing on the photosensitive drums 1202 by developer roll 1214 and forming toner image, the toning dosage in the presumptive area finally reduces with predetermined speed.Particularly, for example, such as will be described later, a kind of like this processing of expression is handled in desalination, that is, carry out the Flame Image Process of the concentration that is used to reduce the image that is extracted, by making the variable luminous quantity that reduces light beam of laser pulse width, perhaps, reduce luminous quantity by reducing beam intensity.
In Fig. 2, the original image pattern that desalination is handled is not carried out in " A " expression; " B ", " C " and " D " are illustrated respectively in the desalination of carrying out under the situation of common paper, recycled writing paper (recycled paper) and OHT (title stock, overhead transparency) and handle.OHT represents to be used for overhead projector (overhead projector, hyaline membrane sheet material OHP) here.Use the base material of resin molding as OHT.
Common paper and recycled writing paper are defined as follows.As typical index, common paper represents that basic weight (basic weight) approximates 70g/m
2And whiteness is equal to or greater than the paper of predetermined value (for example, about 83% (ISO whiteness)).Recycled writing paper represents that wherein mixed waste paper, basic weight approximate 70g/m
2And whiteness is equal to or less than the paper of predetermined value (for example, about 70% (ISO whiteness)).The basic weight of glossy paper (glossy paper) etc. generally surpasses 20070g/m
2About common paper and recycled writing paper, as another definition, secondary stock match ratio (wastepaper pulpcompounding ratio) can be used as typical index.For example, the secondary stock match ratio paper that is equal to or greater than predetermined value (for example, 70% or bigger) can be defined as recycled writing paper.Also exist the secondary stock match ratio to be equal to or greater than 20% or equal the situation that 100% paper can be defined as recycled writing paper.Also can will wherein not have the paper of mixed waste pulp to be defined as common paper, perhaps, the paper that the secondary stock match ratio can also be equal to or less than predetermined value (for example, 10%) be defined as common paper.The two all can be used as condition when paper is divided into common paper or recycled writing paper the whiteness of paper and secondary stock match ratio.
Subsequently, with the various types of information that describe in detail among Fig. 2.
Represent to be equal to or greater than 5 points as " 1 " of branches (branch number) along the image-region (line width) of sub scanning direction; " 2 " expression line width equals the desalination of 3 to 4 points to be handled; " 3 " expression line width equals the desalination of 2 points to be handled.In Fig. 2, to " 3 ", the desalination that 7 dotted lines, 4 dotted lines and 2 dotted lines are shown respectively as typical example is handled about " 1 ".Dotted line is represented by the line along the formation of main scanning direction layout points successively.For example, the picture pattern that constitutes by 7 lines of " 7 dotted line " expression.
Numerical value in the pixel " 1 " or " 0.5 " represent that the desalination of each pixel is than (predetermined ratio).The part that numerical value " 0.5 " is shown becomes the image-region that stands to desalinate processing.In this embodiment,, make that the laser pulse width of a point is variable, control the amount of developer thus by carrying out the desalination Flame Image Process.
Particularly, the printing of the pulse width of " 1 " expression 100%, the printing of the pulse width of " 0.5 " expression 50%.For example, realize the desalination processing of the B-2 among Fig. 2 by Laser emission as shown in Figure 3.In Fig. 3 along among the lasing fluorescence pattern 4a of main scanning direction, protuberance is corresponding with printing portion, recess is corresponding with non-printing portion.In the drawings, width A represents the pulse width of 100% in the point, and width B is represented the pulse width of 50% in the point.That is, lasing fluorescence pattern 4a represents, respectively, prints first line and the 4th line by 100% pulse width, and, print second line and three-way by 50% pulse width.By printing lasing fluorescence pattern 4a, obtain picture pattern 4b.
Subsequently, with the B-1 to D-3 in the key diagram 2 successively.
At first, about the picture pattern of 7 dotted lines from second line of bottom with from second line at top because big, therefore desalinate 50% setting (B-1) for the influence of hangover.Similarly, about second line of 4 dotted lines and three-way, desalinate 50% setting (B-2).For example, under the situation of the picture pattern that is made of 100 dotted lines, desalination is from second line at top with as second-line the 99th line from the bottom.Under situation, set second line (B-3) of exerting one's influence for hangover with desalination by 2 dotted line composing images patterns.
In recycled writing paper, under situation, set to desalinate second line to the 7th line (C-1) as last line by 7 dotted line composing images patterns.Similarly, under situation, set to desalinate second line to the, four lines (C-2) by 4 dotted line composing images patterns.Under situation, can desalinate second line to the, 100 lines or can desalinate second line and from second line to the, six lines of bottom by 100 dotted line composing images patterns.Under situation, because no matter be that what transfer materials type does not change the desalination level, therefore carry out and handle similarly desalination with the desalination of common paper and handle (C-3) such as the superfine wire of 2 dotted lines.
Under the situation of OHT, set the pixel that exists with inside and carry out the desalination processing and (D-1, D-2) do not handled in the pixel execution desalination at line edge online edge.About 2 dotted lines, can handle the abundant toning dosage that reduces by handling similarly desalination with the desalination of common paper and recycled writing paper, and, can fully reduce skew.Therefore, set and handle similarly desalination with the desalination of execution and common paper or recycled writing paper and handle (D-3).
To be described in detail in the art-recognized meanings that the desalination shown in Fig. 2 of this embodiment is handled below.
(i) about because the hangover that the difference of transfer materials type causes and the appearance of skew
Usually, under the situation of recycled writing paper, compare with the situation of common paper, not only the surface state of paper is relatively poor, and it is easy to absorb moisture and resistance value is less.Therefore, in recycled writing paper, because compare the amount of the steam (vapor) that produces when photographic fixing with the situation of common paper bigger than the roughness of big and paper, the incidence (hangover level) of hangover is higher.This fact is apparent in the difference of desalination amount of B-1 among Fig. 2 and the relation between the C-1 and B-2 and C-2.
And, as mentioned above, owing to use resin molding as base material, therefore moisture absorption does not appear under the situation of OHT.Even moisture is absorbed, its moisture absorption amount is also lacked than the moisture absorption amount of common paper or recycled writing paper fully.Therefore, the hangover level of OHT is low.But because surface resistance is low because of the influence that is coated on lip-deep surfactant, the electric charge that therefore will remain on the reverse side is easy to be removed and is easy to occur skew.Therefore, in recycled writing paper and OHT, must increase the desalination amount with Duoing, that is, compare, widen and to stand to desalinate the image-region of processing and reduce toning dosage with normal conditions than normal conditions.
As mentioned above, about common paper or recycled writing paper, carry out the Flame Image Process that is used for conditions of streaking mainly consider hangover (also can avoid be offset predetermined process method) as first transfer materials.About first transfer materials, the dispersing of the developer that the evaporation in the time of must preventing with the moisture on-line image that comprises in transfer paper by photographic fixing is relevant.The transfer materials that disperses that need prevent aforesaid developer can further be classified: for example, common paper can be defined as first transfer paper, and recycled writing paper can be defined as second transfer paper etc.
About OHT, carry out the Flame Image Process that is used for shift phenomenon (predetermined disposal route) of mainly considering shift phenomenon as second transfer materials.This second transfer materials also can be defined as not needing or need hardly to prevent the transfer materials that disperses of developer.
(ii) about because the concentration that the difference of transfer materials type causes reduces and the appearance of hollow line
Reduce toning dosage by being handled by desalination, hangover and skew can be enhanced.But, if the desalination amount is too big, occur so that concentration reduces and hollow line in a kind of.For example, if the desalination amount is determined fully to reduce hangover in being easy to most the recycled writing paper that occurs trailing, concentration reduction or hollow line become obvious in common paper so.In recycled writing paper, because the whiteness of paper is low, therefore, even under the situation of the dosage of similarly mixing colours, the concentration reduction on the paper also is suppressed.Therefore, bigger even the desalination amount in the recycled writing paper is set as than the desalination amount of common paper, do not have problems yet.Similarly, in OHT, because the toner in the projected image partly is getting final product of deceiving, therefore slight concentration reduction does not cause problem.But as picture quality, the image border aquatic foods sharp (sharp) that obtain when image is projected are important.Therefore, must not carry out desalination to the pixel at line edge in OHT handles.
Because and different, it is important therefore carrying out the desalination processing according to each transfer materials type according to the transfer materials type for required characteristic and quality as explained above.In this embodiment, " common paper ", " recycled writing paper " and " OHT " three types are made as the transfer materials type, and carry out desalination by different disposal routes and handle.
(iii) about the difference of picture pattern
Know that the typical case is in thin relatively line, for example occur hangover in the picture pattern of dozens of point or be offset about four.In the line in this scope, the typical case occurs because the difference that the transfer materials type causes.But about the superfine wire such as two dotted lines, no matter be what transfer materials type, hangover and offset level do not change.Therefore, handle, exist in the situation of quality deterioration in two dotted lines so if apply for the desalination of the pattern decision that is easy to occur to trail and is offset for all images.Therefore, in this embodiment, picture pattern is divided into such as 5 or three types picture pattern of the picture pattern, 3 to 4 picture pattern of multiple spot and 2 s' picture pattern more, and sets desalination and handle.Especially, in 2 picture pattern, no matter be that what transfer materials is all set identical desalination processing.
Because more than, in this embodiment, as shown in Figure 2 " common paper ", " recycled writing paper " and " OHT " are made as the transfer materials type for three types.Also similarly picture pattern is divided into such as along 5 of sub scanning direction or three types picture pattern of the picture pattern, 3 to 4 picture pattern of multiple spot and 2 s' picture pattern more, and sets desalination and handle.In 2 picture pattern, no matter be that what transfer materials is all set identical desalination processing.In other picture pattern, be made as the desalination zone (area) of recycled writing paper and OHT wideer than the desalination zone (area) of common paper.In OHT (D-1, D-2), (C-1, C-2) compares with recycled writing paper, do not carry out the desalination of the 7th line (under-1 situation) and the 4th line (under-2 situation) and handles.This is because as explained above, the image border must be bright sharp in OHT.
Subsequently, the method that explanation is handled as the desalination in the graphics processing unit 60 (desalination processing unit) of control module or graphics processing unit.
Fig. 4 illustrates the process flow diagram that is used to control as the operating process of the luminous quantity of the scanner 1201 of exposing unit.This operating process is carried out in processing by CPU40 and graphics processing unit 60.Hereinafter with reference to Fig. 1 and Fig. 4 a series of operation is described.
Be converted into the view data of 1 dot element in the bit image memory 50 of image information in printer 10 that principal computer 20 from Fig. 1 sends.The image of conversion is sent to graphics processing unit 60.Graphics processing unit 60 calculates for the image information actuating logic that sends according to the process flow diagram of Fig. 4.
That is, at first, among the step S1001 in Fig. 4 (first Flame Image Process), carry out hitherto known predetermined picture for the image information of input from the outside and handle.Carry out this Flame Image Process for the whole visual picture that is transferred on the transfer materials.As Flame Image Process, for example, exist the shake (dither) of the gray-scale rendition be used to improve shadow tone to handle and smoothing processing etc.For example, the technology of desalinating for the light transmission of improving OHT is known so far.By Japanese Patent Application Publication No.2007-062037, the technology that is used for according to each media type (common paper, recycled writing paper, ground paper etc.) execution halftone process is known.As other method, for example, by Japanese Patent Application Publication No.2004-230846 and No.2002-166602, it also is known being used for carrying out the technology that toner reduces according to the type of image (object).In above file, disclose be used for preventing since defective photographic fixing or defective transfer printing particularly in the become Flame Image Process of tangible this situation of dispersing of fine rule or character toner.As mentioned above, in this embodiment, in step S1001, carry out for improve picture quality well-known in correlation technique for image information, do not consider the hangover in the fixing device and the Flame Image Process of skew.
In the process flow diagram of Fig. 4, at first carry out the Flame Image Process that is not intended to reduce hangover and skew, then, carry out the Flame Image Process (S1004, S1006 to S1008 etc.) that is intended to reduce hangover and skew.But, the invention is not restricted to this method.For example, also can after the Flame Image Process of considering hangover and skew, carry out the Flame Image Process (S1001) that is not intended to reduce hangover and skew.Perhaps, also can carry out the Flame Image Process that is used to reduce toner adhesive capacity (developer level) simultaneously.
Subsequently, in step S1002 (second Flame Image Process), extract as 100% concentration part and wherein along the length of main scanning direction (vertical with the sheet material direction of transfer/almost vertical direction) image longer than predetermined length (predetermined counts).For example, can be with 4 as predetermined length.This is because be point rather than line along the short image of main scanning direction, and hangover is difficult to occur very much.Usually, particularly in the image of 600dpi in 4 to 8 scope and when the width of sub scanning direction along the line equals 190 to 380 μ m, be easy to occur conditions of streaking.Equal at width conditions of streaking can typically occur under the situation of 5mm or bigger line length along main scanning direction.As mentioned above, when extracting image information, in fact, as shown in Figure 2, use along length and be equal to or greater than first length and be equal to or greater than the picture pattern of second length (for example, 2 points or more a plurality of point) as target along the length of the main scanning direction vertical with the direction of transfer of transfer materials as the sub scanning direction of the direction of transfer of transfer materials.
Usually, as being used as the image that 100% concentration partly is extracted, there are line image, character picture, have the solid image of predetermined transverse width and vertical width etc.Though 100% concentration of mentioning here part is represented black image under the situation of the monochrome image of two-value (binary) data,, in the image of multi-value data, concentration may not always equal 100%.For example, can use and have this high concentration (for example, 70% or bigger) makes the image can occur trailing etc. as the target of extracting (being "Yes" in step S1002).
Be not 100% concentration part (or high concentration) image view data or be sent to the image synthesis unit along the length of main scanning direction less than the predetermined view data of counting, handle and do not carry out desalination.In step S1003, the view data that is extracted as the image of 100% concentration (or high concentration) and as the length along main scanning direction be equal to or greater than view data that the predetermined image of counting is extracted further according to its picture pattern (along the picture traverse of sub scanning direction) by exhaustive division.
If view data is made of a point, carries out image is synthetic so handles, and does not handle (step S1009) and do not carry out desalination.If view data is made of two points, 2 the desalination of being used among the execution in step S1004 is handled so, and then with image data transmission to image synthesis unit (step S1009).
If view data is made of three or more points, handling procedure (routine) advances to next step S1005 so.
In step S1005, distinguish the transfer materials type.Obtain the information of the type of the transfer materials (transfer paper) of actual transfer printing visual picture above (reference) representative and the method for the information that identification obtains by CPU40, carry out this differentiation.Can tentatively be stored in the nonvolatile memory (not shown) by the information of for example inciting somebody to action the representative recording materials type that be associated with the collecting pallet of top stacked transfer materials in the past and its method of CPU40 acquisition, the information of the type of transfer materials be represented in acquisition.As setting the method for the information of representing the recording materials type explicitly with collecting pallet, for example, the operational order or the response that can respond the user by guidance panel 41 are set it from the directive command of external host computers.As another preparation method, for example, CPU40 can represent the information of the type of transfer materials based on the testing result acquisition that is arranged on the transfer materials sensor (not shown) in the printer.
The transfer materials type of in Fig. 2, distinguishing and the information of picture pattern type with reference to representative, and, the processing that is used for accurate hangover and skew etc. that can tackle defective image in step S1006, S1007 and S1008, carried out.Processing among step S1006, S1007 and the S1008 is corresponding with second Flame Image Process.Especially, in step S1006 and S1007,, carry out the Flame Image Process of the image color of the picture pattern (comprising the x wire image) that is used to reduce extraction in order to prevent dispersing of the developer relevant with the evaporation of the moisture that in transfer paper, comprises.
If transfer materials is a common paper, view data stands the desalination processing that is used for common paper among the step S1006 so, and is sent to image synthesis unit (step S1009) then.If transfer materials is recycled writing paper or OHT, the view data desalination that is used for OHT that also stands desalination processing that is used for recycled writing paper among the step S1007 or step S1008 is respectively similarly handled so, and is sent to image synthesis unit (step S1009) then.That is, in step S1005 (change unit), the type that desalination is handled according to transfer materials becomes another desalination processing (S1006 to S1008).
In step S1005, for example, accessible region divides the information of designated representative's transfer materials type the print job data that sends from principal computer 20 or distinguishes the information of user by guidance panel 41 designated representative's transfer materials types, distinguishes.
In step S1009, all images data that stand to desalinate the view data of processing in the step in front and do not stand to desalinate the view data of processing are sent to the image synthesis unit, are synthesized, and become an image.In next step S1010, image synthetic in step S1009 is sent to the image output unit and is output to Printer Engine 70.Then, finish the processing operation.The Printer Engine 70 that has been sent out image is carried out laser beam emission (exposure) based on the image that sends from scanner 1201, and carries out well-known image generation subsequently.
In this embodiment, the desalination in pixel is set as the same value such as 50% than under all conditions, and, make that according to transfer materials and picture pattern it is variable carrying out the zone that desalination handles.But, the invention is not restricted to this structure.For example, the desalination zone can be fixed, and can make that desalination is variable than (concentration).
According to present embodiment, even the transfer materials type change also can be realized stable picture quality accordingly with various picture patterns.
Especially, the present invention is very useful under such a case, promptly, in the i.e. position before transfer materials arrives retained part of the upstream side of retained part, band along the rotation of the sliding component (well heater) of fixing device has not to the part outstanding curvature lower than retained part, and can not carry out and preheat.
(embodiment 2)
With reference to Fig. 5 and Fig. 6 the second embodiment of the present invention is described below.
Because the whole structure (Fig. 7) of the image processing system in the present embodiment and among function and first embodiment those are similar, therefore omission is to their explanation, and, will illustrate and the first embodiment difference.
In the defective image such as hangover and skew, level is owing to some factors beyond the type of transfer materials change.One of factor is aforesaid toning dosage.Existence is about a plurality of parameters of toning dosage.As typical parameter, there are charging bias voltage and development bias voltage.Apply charging bias voltage or development bias voltage by the high-voltage power apparatus (not shown) to charging roller 1213 or developer roll 1214 as predetermined value (with reference to Fig. 5).The bias voltage that applies becomes the bias voltage of charging roller 1213 or developer roll 1214.There is such a case, that is, and in order suitably to keep picture quality, according to for example such as the various conditions of the quantity of sheet material etc. under the control of Printer Engine, automatically switch charging bias voltage and development bias voltage such as image color and line width etc.Also usually exist changeable charging bias voltage of user and development bias voltage with the concentration of acquisition hope and the situation of line width.
As another factor, there is environment for use.Because hangover is to be caused by the steam from paper as explained above, therefore in the environment of big high temperature of the amount of moisture of paper and high humility, be easy to occur hangover.Except steam, to acting on changing of coulomb masterpiece contribution on the toner such as temperature and humidity such as the parameter of the resistance value of paper and the quantity of electric charge of toner etc. according to atmosphere.Usually, and quantity of electric charge toner low owing to the resistance of paper under the condition of high temperature and high humility also lacks, and is disadvantageous for hangover and skew therefore.
Even under the situation that so various conditions have changed, also keep suitable picture quality in order to make, in this embodiment, except transfer materials type and picture pattern, it is variable also making desalination handle according to environmental baseline, charging bias condition and development bias condition.
Describing desalination in detail with reference to Fig. 5 and Fig. 6 handles.
In this embodiment, make that according to transfer materials type and picture pattern the zone of carrying out the desalination processing is variable, and, make that according to environmental baseline, charging bias condition and development bias condition the desalination in the pixel is variable than (predetermined ratio).Similar according among the difference in the desalination zone of transfer materials type and picture pattern and the embodiment 1 shown in Figure 2.
Fig. 5 illustrates the form according to the desalination ratio in the pixel of environmental baseline, charging bias condition and development bias condition.In this embodiment, charging bias condition and development bias condition is set as three types of A, B and C respectively.The scope of charging bias voltage A, B and C is set as respectively-650V or littler ,-650V to-450V and-450V or bigger.The scope of development bias voltage A, B and C is set as respectively-150V or bigger ,-300V to-150V and-300V or littler.That is, charging bias voltage and development bias voltage all are set as and make toning dosage increase with the order of A, B and C.Environmental baseline also is made as three types condition similarly respectively: the amount of moisture in the temperature and humidity of atmosphere is less than 5.0g/m
3, 5.0g/m
3To 15.0g/m
3, with greater than 15.0g/m
3The amount of moisture here obtains from temperature and humidity is unconditional by arithmetical operation.By the environmental detection unit (not shown) that is provided with for image processing system, detect temperature and humidity as environmental baseline.Change the desalination disposal route according to testing result.
Fig. 6 illustrates charge condition C, development conditions A and environmental baseline (amount of moisture) greater than 15.0g/m
3Situation under each transfer materials and the tabulation handled of the desalination of each picture pattern.Under above condition, desalination is than being set as " 0.4 ", and the laser pulse width of desalinating in the zone equals 40%.
According to embodiment, though various types of condition changing, always also can provide stable high-quality image.
Though use amount of moisture as environmental parameter in the above description, for example only serviceability temperature as environmental parameter.In this case, to be set as " being lower than 15 ℃ ", " 15-25 ℃ ", " being higher than 25 ℃ " by the order from a left side be enough to the numerical value in one hurdle of the environmental baseline among Fig. 5.Though in above embodiment, come carries out image to form operation by the whole of combined charging condition, development conditions and environmental baseline, each that also can be in these conditions down individually carries out image form operation.
(embodiment 3)
In this embodiment, the method as handling according to various condition changing desalinations makes that laser power is variable, and has changed exposure.
In embodiment 1, make that according to the transfer materials type desalination zone is variable.In embodiment 2, make that according to charge condition, development conditions and environmental baseline the laser pulse width (laser emission time) in the desalination zone is variable.The method of handling according to the desalination in embodiment 1 and 2, mentioned because must extraction, modification and composograph data, therefore exist Flame Image Process to complicate and worry that print speed reduces.
Therefore, in this embodiment, by making that laser power is variable and do not carry out Flame Image Process as explanation in embodiment 1 and 2, changes desalination and handles.Particularly, among the step S1006 in Fig. 4, S1007 and the S1008, realize gray scale according to Fig. 2 by changing laser power rather than Flame Image Process.That is, with Fig. 2 in pixel in " 1 " or " 0.5 " corresponding laser power is become 100% or 50% just enough.In this case, for example,, be used to indicate the control signal of this request so to scanner 1201 inputs if the user wishes laser power is made as 50%.Because the electromotive force of the exposed portion on the photosensitive drums also changes by changing laser power as mentioned above, so toner quantitative changeization and hangover and offset level can be enhanced.
Because each some ground makes that laser power is variable and is actually very difficult that therefore hope is used this method for the part of the processing that changes on the basis of page or leaf unit.
Thus and since can reduce the view data of handling as desalination processing a part or needn't image data processing, burden alleviates and print speed is not hindered so handle.
(other embodiment)
In embodiment 1 to 3, carry out the processing of step S1002 to S1009 shown in Figure 4 by graphics processing unit 60.But, can the Printer Engine 70 in Fig. 1 in the processing of step S1002 to S1009 in the execution graph 4.In this case, because the image among the execution in step S1009 is synthetic in Printer Engine 70, it is unnecessary therefore becoming for the output of the image among Printer Engine 70 executed S1010 processing by graphics processing unit 60.
Carry out the processing of step S1001 to S1009 shown in Figure 4 by the principal computer among Fig. 1 20.In this case, after the image in principal computer 20 execution S1009 is synthetic, in S1010, handle from 20 pairs of printer 10 carries out image outputs of principal computer.
Even by aforesaid structure, can consider that also the difference of transfer materials type is tackled the defective image that occurs in the photographic fixing step.
Though with reference to exemplary embodiment the present invention has been described, has should be understood that to the invention is not restricted to disclosed exemplary embodiment.The scope of following claim should be endowed the wideest explanation, to comprise all such changes and equivalent configurations and function.
Claims (11)
1. image processing system, this image processing system has and is suitable for thus electrostatic latent image being formed at exposed portion on the image bearing member based on expose image bearing member by live part charging of image information, form the development part of visual picture with being suitable for thus by the develop electrostatic latent image that forms by exposed portion of toner, and, in this image processing system, top transfer printing the transfer paper of the visual picture that divide to form by development section be sent to the photographic fixing part, and, by photographic fixing part visual picture by heat and pressure by photographic fixing to transfer paper, this image processing system comprises:
Extract part, be suitable for extracting along the x wire image information of the x wire image of main scanning direction extension from image information;
Control section, be suitable for controlling the luminous quantity of exposed portion, with the amount of control, so that prevent and the moisture that in transfer paper, comprises dispersing at the evaporation during partly by photographic fixing is relevant by photographic fixing based on the x wire image of x wire image information toner based on the toner that develops by the x wire image information of extracting extracting section; And
Obtain part, the sheet type information of the type of transfer paper by photographic fixing part photographic fixing x wire image above being suitable for obtaining to represent,
Wherein, control section is differently carried out the control of luminous quantity according to sheet type information, so that prevent dispersing of the toner relevant with the evaporation of the moisture that comprises in transfer paper.
2. according to the device of claim 1, wherein,
Control section is as image processing section, and the processing that is used to control the luminous quantity of exposed portion is the Flame Image Process that is used for the x wire image, and,
Image processing section is carried out first Flame Image Process of the amount that is used to change the toner that is transferred when sheet type information is indicated first transfer paper, and carries out second Flame Image Process of the amount that is used to change the toner that is transferred when sheet type information is indicated second transfer paper.
3. according to the device of claim 1, wherein, control section makes that based on the line width of the x wire image information of sheet type information and extraction the control of luminous quantity is different.
4. according to the device of claim 1, wherein, control section is used for the control of the Flame Image Process of conditions of streaking as luminous quantity for common paper and recycled writing paper execution, and control section is carried out for title stock and is used for toner image and is electrostatically transferred to the Flame Image Process of shift phenomenon of photographic fixing part as the control of luminous quantity.
5. according to the device of claim 4, wherein, for described common paper, the match ratio that whiteness is equal to or greater than predetermined value or secondary stock is equal to or less than predetermined value, and for described recycled writing paper, the match ratio that whiteness is equal to or less than predetermined value or secondary stock is equal to or greater than predetermined value.
6. according to the device of claim 1, wherein, extract extracting section and be equal to or greater than first length and be equal to or greater than the x wire image information of second length along the length of main scanning direction along length as the sub scanning direction of the direction of transfer of transfer paper.
7. according to the device of claim 1, also comprise the environment measuring part that is suitable for sense environmental conditions, and,
In order to prevent dispersing of the toner relevant with the evaporation of the moisture that comprises in transfer paper, control section makes that based on the testing result of sheet type information and environment measuring part the control of luminous quantity is different.
8. according to the device of claim 1, wherein, in order to prevent dispersing of the toner relevant with the evaporation of the moisture that comprises in transfer paper, control section makes that with the bias voltage that is applied to the part of developing the control of luminous quantity is different with the bias voltage that is applied to live part or based on sheet type information based on sheet type information.
9. according to the device of claim 1, wherein,
Photographic fixing partly has sliding component, is used for the supporting member of support slide, along the band of sliding component rotation be used for forming the pressing element of retained part with sliding component by band, and,
Position before transfer paper arrives retained part, band have not to the part outstanding curvature lower than retained part.
10. according to the device of claim 1, wherein, the processing that is used to control the luminous quantity of exposed portion is the Flame Image Process that is used for the x wire image.
11. image forming method that is used for image processing system, this image forming method has and is used for thus electrostatic latent image being formed at step of exposure on the image bearing member based on image information by expose image bearing member by live part charging of exposed portion, form the development step of visual picture with being used for thus by the develop electrostatic latent image that forms by step of exposure of toner, and, in this image forming method, top transfer printing the transfer paper of the visual picture that forms by development step be sent to the photographic fixing part, and, by photographic fixing part visual picture by heat and pressure by photographic fixing to transfer paper, this image forming method comprises:
Extraction step is used for extracting along the x wire image information of the x wire image of main scanning direction extension from image information;
Controlled step, be used for controlling the luminous quantity of step of exposure, the amount of the toner that develops based on the x wire image information of extracting by extraction step with control is so that prevent and the moisture that comprises in transfer paper dispersing at the evaporation during partly by photographic fixing is relevant by photographic fixing based on the x wire image of x wire image information toner; And
Obtain step, the sheet type information of the type of transfer paper by photographic fixing part photographic fixing x wire image above being used to obtain to represent,
Wherein, described controlled step is differently carried out the control of luminous quantity according to sheet type information, so that prevent dispersing of the toner relevant with the evaporation of the moisture that comprises in transfer paper.
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| JP2007283755 | 2007-10-31 | ||
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| JP2008-258311 | 2008-10-03 | ||
| JP2008258311 | 2008-10-03 | ||
| JP2008258311A JP5473287B2 (en) | 2007-10-31 | 2008-10-03 | Image forming apparatus and image forming method |
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| CN101424900B true CN101424900B (en) | 2011-03-09 |
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| JP2000175029A (en) * | 1998-12-02 | 2000-06-23 | Canon Inc | Image forming method, device and storage medium |
| CN1499315A (en) * | 2002-11-06 | 2004-05-26 | ������������ʽ���� | Image forming device and heating developing appts. |
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| JPH06348095A (en) * | 1993-06-03 | 1994-12-22 | Canon Inc | Image forming device |
| JP2001222180A (en) * | 2000-02-10 | 2001-08-17 | Canon Inc | Heater for heating image, image heating device and image forming device |
| JP2002296854A (en) * | 2001-04-02 | 2002-10-09 | Canon Inc | Image forming device |
| JP2005070432A (en) * | 2003-08-25 | 2005-03-17 | Canon Inc | Image forming device |
| JP4533101B2 (en) * | 2004-11-18 | 2010-09-01 | キヤノン株式会社 | Image forming apparatus and image forming method |
| JP2007062037A (en) * | 2005-08-29 | 2007-03-15 | Canon Inc | Image forming apparatus |
| JP2007121647A (en) * | 2005-10-27 | 2007-05-17 | Canon Inc | Image forming apparatus and its control method |
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| JP2000175029A (en) * | 1998-12-02 | 2000-06-23 | Canon Inc | Image forming method, device and storage medium |
| CN1499315A (en) * | 2002-11-06 | 2004-05-26 | ������������ʽ���� | Image forming device and heating developing appts. |
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