CN101266435B - Image concentration stabilization control method and image forming device - Google Patents

Image concentration stabilization control method and image forming device Download PDF

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Publication number
CN101266435B
CN101266435B CN2007101025896A CN200710102589A CN101266435B CN 101266435 B CN101266435 B CN 101266435B CN 2007101025896 A CN2007101025896 A CN 2007101025896A CN 200710102589 A CN200710102589 A CN 200710102589A CN 101266435 B CN101266435 B CN 101266435B
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ink powder
image
mentioned
benchmark
fragmentation pattern
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CN101266435A (en
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平口宽
中泽美树
梅田史郎
日高真聪
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Konica Minolta Inc
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Konica Minolta Inc
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Abstract

The invention supplies an image density stabilizing control method and an image forming device, even if the grain diameter using ink powder changes, the density of the formed ink power image is stabilized. Corresponding to the grain diameter of the used ink power, a plurality of relation lists expressing the relation (ink powder adhesion amount-sensor output) of the ink powder adhesion amount of the norm fragment image (Tp) and the sensor (10) output detected by the image density obtained from the norm fragment image are prepared; forming the norm fragment image of the ink power saturated state adhesion amount in required time, judging the grain diameter of the used ink powder according to the detected density and (norm fragment image density-ink powder grain diameter) relation list, switching the (ink powder adhesion amount-sensor output) relation list into the list of the ink powder grain diameter corresponding to the judging result.

Description

Image concentration stabilization control method and image processing system
Technical field
The electrostatic latent image that the present invention relates to utilize developer to make and be formed on the electrostatic latent image carrier develops, thereby forms duplicating machine, printer, the facsimile recorder of ink powder image and made up image concentration stabilization control method in image processing systems such as compounding machine more than 2 in the middle of their and the image processing system that can implement this method.
Background technology
Thereby form in the image processing system of ink powder image utilizing developer to make to be formed on electrostatic latent image on the electrostatic latent image carrier to develop, people propose to adjust the whole bag of tricks of the concentration of the ink powder image that will form.
Wherein following method is known: with electrostatic latent image carrier or will be formed on intermediate transfer body that ink powder image on this electrostatic latent image carrier is transferred before being transferred on the recording medium etc. forms object as ink powder fragment (patch) image image carrier, the fragmentation pattern picture that forms ink powder on this image carrier (for example being the tetragonal fragmentation pattern picture about 10mm on one side), according to utilize the image color detecting sensor from this fragmentation pattern as detected fragment image color, the concentration of this fragmentation pattern picture is adjusted towards the fragment image color of regulation, carried out the image color adjustment thus.
As an example, known following method: set in advance (ink powder adhesion amount-sensor output) relation table, this relation table is represented the relation of this ink powder adhesion amount and the output of the image color detecting sensor that looks like to obtain from this benchmark fragmentation pattern of the benchmark fragmentation pattern picture of regulation ink powder adhesion amount, formation can produce the fragmentation pattern picture of the sensor output in this table, the development that is used to form this fragmentation pattern picture is exported as benchmark development output, adjust the concentration of ink powder image.
As the image color detecting sensor that detects the fragment image color, usually adopt according to carrying out the sensor that concentration detects from the reflected light of this fragment image reflection by looking like to fragmentation pattern to carry out rayed, as typical example, comprise to fragmentation pattern and look like to carry out light-struck light-emitting component and the sensor that receives from the catoptrical photo detector of this fragmentation pattern picture is known, under the situation that adopts this sensor, sensor output is obtained according to the output of this photo detector.
In addition, as the sensor that belongs to such, can improve the concentration accuracy of detection, can also enumerate and comprise reception from the normal reflection light photo detector of the normal reflection light of fragmentation pattern picture with receive the sensor of photo detector that diffuse that diffuses as photo detector.Under the situation that adopts the sensor that possesses two photo detectors like this, the output of sensor is obtained according to the output of two photo detectors.For example, calculation process (for example calculating output poor of two photo detectors) is carried out in the output of two photo detectors, its result is exported as sensor.For example opening to have put down in writing in the 2005-337749 communique the spy adopts the image color detecting sensor that has two photo detectors like this to carry out the method that image color is adjusted.
[patent documentation 1] spy opens the 2005-337749 communique
Summary of the invention
Invent technical matters to be solved
Be used for the regulation said reference in employing and develop under the situation of above-mentioned (ink powder adhesion amount-sensor output) relation table of output, this table for example uses following sensor to generate: this sensor will utilize toner particle diameter etc. for the ink powder adhesion amount of regular ink powder (setting ink powder) formation of prescribed level and per unit area as the benchmark fragmentation pattern of scheduled volume as the time sensor export the output valve that is adjusted to regulation.
But, research according to the present inventor, adopting according to carrying out from the reflected light of this fragment image reflection under the situation of sensor as the image color detecting sensor of concentration detection, even the ink powder adhesion amount [g/m on this fragmentation pattern picture by looking like to fragmentation pattern to carry out rayed 2] identical, the output of the image color detecting sensor that looks like to obtain from fragmentation pattern also changes corresponding to the size of the particle diameter of employed ink powder, if the particle diameter of ink powder has deviation in the developer, then can't correctly detect the fragment image color.
For example, comprise in use under the situation of sensor as the image color detecting sensor of the above-mentioned normal reflection light photo detector and the photo detector that diffuses, for the fragmentation pattern picture that uses the big ink powder of the regular toner particle diameter of particle diameter ratio to form, the sensor output demonstrates ink powder adhesion amount few (image color is low).Therefore, the adjustment of ink powder concentration is carried out towards the direction that improves concentration, and the result uses the amount of toner that surpasses necessary degree develops electrostatic latent image, thereby image color can overrich.And, form if under this state, proceed image, then can appear at problems such as producing the ink powder pollution in the image forming device body.
In addition, for the fragmentation pattern picture that utilizes the little ink powder of the regular toner particle diameter of particle diameter ratio to form, the sensor output demonstrates ink powder adhesion amount many (image color height).Therefore, the adjustment of ink powder concentration is carried out towards the direction that reduces concentration, the result can produce following problem: the concentration of formed image is low excessively, perhaps adopting under the situation of counting the system that predicts developer or the ink powder surplus in the ink powder supply unit (for example powder box) of its supply ink powder by printing is counted, even this ink powder surplus also has, also can think to lack China ink.
Reason as the toner particle diameter variation, consider following situation: developer or the toner particle diameter in the ink powder supply unit of its supply ink powder have deviation, thereby form the increase of number along with image, the situation that toner particle diameter in developer or the ink powder supply unit changes (mainly being that the more little toner consumption of particle diameter must be fast more), perhaps used powder box begin situation about reusing etc. from the way.
Therefore, first technical matters of the present invention provides the image concentration stabilization control method in a kind of image processing system, the electrostatic latent image that this image processing system utilizes developer to make and is formed on the electrostatic latent image carrier develops with the formation ink powder image, and comprises: ink powder fragmentation pattern picture forms the fragmentation pattern picture image carrier of object; The fragment image formation unit forms the fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this fragmentation pattern picture; And image color detecting sensor, be formed on the concentration of this fragmentation pattern picture according to detecting from the reflected light of this fragment image reflection with the fragmentation pattern picture on the image carrier by looking like to carry out rayed to this fragmentation pattern, the development output of the fragmentation pattern picture that this sensor output on this image processing system can form to be made (ink powder adhesion amount-sensor output) relation table produces is as the benchmark output of developing, carry out the adjustment of ink powder image concentration, wherein, above-mentioned (ink powder adhesion amount-sensor output) relation table is represented the relation of this ink powder adhesion amount and the output of the sensor that looks like to obtain from this benchmark fragmentation pattern of the benchmark fragmentation pattern picture of the regulation ink powder adhesion amount that formed on image carrier at this fragmentation pattern picture by this fragment image formation unit, even this image concentration stabilization control method uses the particle diameter of ink powder to change, also can make the concentration stabilize of the ink powder image that will form.
In addition, second technical matters of the present invention provides a kind of image processing system, utilizes developer to make to be formed on the electrostatic latent image on the electrostatic latent image carrier to develop to form ink powder image, and comprising: ink powder fragmentation pattern picture forms the fragmentation pattern picture image carrier of object; The fragment image formation unit forms the fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this fragmentation pattern picture; The image color detecting sensor is formed on the concentration of this fragmentation pattern picture with the fragmentation pattern picture on the image carrier according to detecting from the reflected light of this fragment image reflection by looking like to carry out rayed to this fragmentation pattern; And image color adjustment unit, wherein, this image color adjustment unit keeps (ink powder adhesion amount-sensor output) relation table of this ink powder adhesion amount and the relation of the output of the sensor that looks like to obtain from this benchmark fragmentation pattern of the benchmark fragmentation pattern picture of expression regulation ink powder adhesion amount; The development output that can form the fragmentation pattern picture that makes the sensor output generation on this (ink powder adhesion amount-sensor output) relation table is as benchmark development output, carry out the adjustment of ink powder image concentration, even this image processing system uses the particle diameter of ink powder to change, also can make the concentration stabilize of the ink powder image that will form.
The technological means of technical solution problem
The present invention is in order to solve above-mentioned first technical matters, image concentration stabilization control method in a kind of image processing system is provided, the electrostatic latent image that this image processing system utilizes developer to make and is formed on the electrostatic latent image carrier develops with the formation ink powder image, and comprises: ink powder fragmentation pattern picture forms the fragmentation pattern picture image carrier of object; The fragment image formation unit forms the fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this fragmentation pattern picture; And image color detecting sensor, be formed on the concentration of this fragmentation pattern picture according to detecting from the reflected light of this fragment image reflection with the fragmentation pattern picture on the image carrier by looking like to carry out rayed to this fragmentation pattern, the development output of the fragmentation pattern picture that this sensor output on this image processing system can form to be made (ink powder adhesion amount-sensor output) relation table produces is as the benchmark output of developing, carry out the adjustment of ink powder image concentration, wherein, above-mentioned (ink powder adhesion amount-sensor output) relation table is represented the relation of this ink powder adhesion amount and the output of the sensor that looks like to obtain from this benchmark fragmentation pattern of the benchmark fragmentation pattern picture of the regulation ink powder adhesion amount that formed on image carrier at this fragmentation pattern picture by this fragment image formation unit, and this image concentration stabilization control method comprises:
A plurality of (ink powder adhesion amount-sensor output) relation table that preparation generates corresponding to toner particle diameter is as above-mentioned (ink powder adhesion amount-sensor output) relation table; And
Form the benchmark fragmentation pattern picture of ink powder state of saturation adhesion amount as said reference fragmentation pattern picture at above-mentioned fragmentation pattern picture on image carrier in predetermined timing by above-mentioned fragment image formation unit, detect the concentration of this benchmark fragmentation pattern picture by above-mentioned image color detecting sensor, according to concentration and pre-prepd (benchmark fragment image color-toner particle diameter) relation table by detected this benchmark fragmentation pattern picture of this image color detecting sensor, differentiate to use the particle diameter of ink powder, go forward side by side and be about to (ink powder adhesion amount-sensor output) relation table and switch in above-mentioned a plurality of (ink powder adhesion amount-sensor output) relation table, differentiate the table hand-off process of (ink powder adhesion amount-sensor output) relation table of result's toner particle diameter corresponding to this.
The present invention provides a kind of image processing system in order to solve above-mentioned second technical matters, utilizes developer to make to be formed on the electrostatic latent image on the electrostatic latent image carrier to develop to form ink powder image, comprising:
Ink powder fragmentation pattern picture forms the fragmentation pattern picture image carrier of object;
The fragment image formation unit forms the fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this fragmentation pattern picture;
The image color detecting sensor is formed on the concentration of this fragmentation pattern picture with the fragmentation pattern picture on the image carrier according to detecting from the reflected light of this fragment image reflection by looking like to carry out rayed to this fragmentation pattern; And
The image color adjustment unit,
Wherein, this image color adjustment unit
This ink powder adhesion amount of the benchmark fragmentation pattern picture of maintenance expression regulation ink powder adhesion amount and (ink powder adhesion amount-sensor is exported) relation table of the relation of the output of the sensor that looks like to obtain from this benchmark fragmentation pattern;
The development output that can form the fragmentation pattern picture that makes the sensor output generation on this (ink powder adhesion amount-sensor output) relation table is carried out the adjustment of ink powder image concentration as benchmark development output,
Above-mentioned image color adjustment unit also
A plurality of (ink powder adhesion amount-sensor output) relation table that maintenance generates corresponding to toner particle diameter is as above-mentioned (ink powder adhesion amount-sensor output) relation table;
Make above-mentioned fragment image formation unit form the benchmark fragmentation pattern picture of ink powder state of saturation adhesion amount as said reference fragmentation pattern picture at above-mentioned fragmentation pattern picture on image carrier in predetermined timing, according to by the concentration of detected this benchmark fragmentation pattern picture of above-mentioned image color detecting sensor with (the benchmark fragment image color-toner particle diameter) relation table that keeps in advance, differentiate to use the particle diameter of ink powder, go forward side by side and be about to (ink powder adhesion amount-sensor output) relation table and switch in above-mentioned a plurality of (ink powder adhesion amount-sensor output) relation table, differentiate the table hand-off process of (ink powder adhesion amount-sensor output) relation table of result's toner particle diameter corresponding to this.
Image processing system and the image processing system of the present invention of using image concentration stabilization control method of the present invention both can be that monochrome image forms device, also can be that coloured image forms device.
No matter any electrostatic latent image carrier that can use is as fragmentation pattern picture image carrier, forms device etc. and this intermediate transfer body etc. can be looked like to use image carrier as fragmentation pattern being formed on coloured image that ink powder on the electrostatic latent image carrier looks like to be transferred to the structure on the intermediate transfer body etc. but have.
As above-mentioned " form the fragmentation pattern picture of ink powder on image carrier and comprise the fragment image formation unit of developer " at the fragmentation pattern picture, can the fragment image formation unit that comprise " electrostatic latent image carrier; make the charged device of this electrostatic latent image carrier surface charging; implement the image exposing apparatus with the corresponding exposure of the fragmentation pattern picture that will form in the charging zone that charged device forms by this; electrostatic latent image that forms by image exposure is developed form the developer of ink powder picture " be shown example, look like to be transferred under the situation on the intermediate transfer body etc. will being formed on ink powder on the electrostatic latent image carrier, can the fragment image formation unit that also comprises the transfer device that is used for this purpose be shown example.
Above-mentioned " (ink powder adhesion amount-sensor output) relation table " can adopt by test in advance and wait the table of obtaining.
Above-mentioned " develop output " is the ability of instigating the electrostatic latent image of ink powder on electrostatic latent image carrier to adhere to, its be subjected to the developing bias voltage of exposure, developer when electrostatic latent image carrier forms electrostatic latent image, the electrostatic latent image carrier that causes by charged device development left and right sides essential factors such as electrified voltage about.The adjustment of exporting of developing can be undertaken by at least one that adjust in these development left and right sides essential factors.Above-mentioned " benchmark develop output " be for about the development left and right sides essential factors such as electrified voltage of the electrostatic latent image carrier that causes to the developing bias voltage of the exposure to electrostatic latent image carrier of the ink powder adhesion amount of electrostatic latent image, developer, by charged device, for can form the fragmentation pattern that obtains the sensor output on above-mentioned (ink powder adhesion amount-sensor output) relation table as the time the general name of these development left and right sides essential factors.
As above-mentioned " toner particle diameter ", for example can adopt the mean grain size of ink powder.
In addition, " the ink powder state of saturation adhesion amount " on above-mentioned " the benchmark fragmentation pattern picture of ink powder state of saturation adhesion amount " even be meant develop output more than it, be used to form the benchmark fragmentation pattern picture that forms on the electrostatic latent image carrier, in fact also do not change and ink powder adhesion amount when being maintained fixed to the ink powder adhesion amount of electrostatic latent image.
Above-mentioned (benchmark fragment image color-toner particle diameter) relation table can adopt by test in advance and wait the table of obtaining.As this table, for example can enumerate and be illustrated in the concentration of utilizing the detected benchmark fragmentation pattern of image color detecting sensor picture (making the identical benchmark fragmentation pattern picture of ink powder adhesion amount) toner particle diameter when being concentration in the specialized range and be regular (regulation) toner particle diameter (setting toner particle diameter), when this benchmark fragment image color is lower than concentration in this specialized range for be table greater than the toner particle diameter of regular toner particle diameter, when this benchmark fragment image color is higher than concentration in this specialized range less than the toner particle diameter of regular toner particle diameter.
According to image concentration stabilization control method of the present invention and image processing system of the present invention,, use a plurality of (ink powder adhesion amount-sensor output) relation table that generates corresponding to toner particle diameter as above-mentioned (ink powder adhesion amount-sensor output) relation table.
And, form the benchmark fragmentation pattern picture of ink powder state of saturation adhesion amount on image carrier at above-mentioned fragmentation pattern picture in predetermined timing by above-mentioned fragment image formation unit, detect the concentration of this benchmark fragmentation pattern picture by above-mentioned image color detecting sensor, according to concentration and pre-prepd (benchmark fragment image color-toner particle diameter) relation table by detected this benchmark fragmentation pattern picture of this image color detecting sensor, differentiate the particle diameter that uses ink powder, (ink powder adhesion amount-sensor output) relation table of being about to adopt in order to determine said reference to develop output of going forward side by side switches in above-mentioned a plurality of (ink powder adhesion amount-sensor output) relation table, differentiate the table hand-off process of (ink powder adhesion amount-sensor output) relation table of result's toner particle diameter corresponding to this.
Like this, corresponding to the particle diameter that uses ink powder (ink powder adhesion amount-sensor output) relation table is switched to (ink powder adhesion amount-sensor output) relation table that adapts to toner particle diameter, develop and export according to (ink powder adhesion amount-sensor output) relation table decision benchmark after this switching, and carry out the adjustment of ink powder image concentration based on this, the therefore concentration stabilize of the ink powder image that forms thus.
In addition, in the hand-off process of " (ink powder adhesion amount-sensor output) relation table ", also comprise the processing that present table is directly used in decision.
As above-mentioned " image color detecting sensor ", can example illustrate and comprise to above-mentioned fragmentation pattern and look like to carry out light-struck light-emitting component and receive sensor from the catoptrical photo detector of this fragmentation pattern picture.Under the situation that adopts this sensor, the output of sensor can be obtained according to the output of this photo detector.
As the sensor of the sensor that belongs to the type, can adopt comprise reception from the normal reflection light photo detector of the normal reflection light of above-mentioned fragmentation pattern picture and the photo detector that receives the photo detector that diffuses that diffuses as above-mentioned photo detector.Adopting under the situation of this sensor, the output of the sensor can be exported according to this normal reflection light photo detector output and this photo detector that diffuses and be obtained.
For example, calculate the difference of the output of normal reflection light photo detector and the photo detector output that diffuses, adopt this difference as this sensor output in above-mentioned (ink powder adhesion amount-sensor output) relation table.
In addition, can calculate the ratio (photo detector output is exported/diffused to normal reflection light photo detector) of the output of normal reflection light photo detector and the photo detector output that diffuses, adopt this ratio as this benchmark fragment image color in above-mentioned (benchmark fragment image color-toner particle diameter) relation table.
The timing of above-mentioned as carrying out " table hand-off process ", can enumerate the timing of selecting as typical example from following timing: (1) connects the timing of the main switch of image processing system; (2) adopt to above-mentioned developer at above-mentioned image processing system and supply with under the situation of replaceable powder box of ink powder the timing of changing the timing of this powder box or loading new powder box; (3) image forms the timing that number reaches the regulation number.
Form and in image processing system, to be provided with under the situation of a plurality of developers the device resembling coloured image, in image concentration stabilization control method of the present invention,
At every kind of ink powder of this each developer, prepare above-mentioned a plurality of (ink powder adhesion amount-sensor output) relation table and above-mentioned (benchmark fragment image color-toner particle diameter) relation table corresponding to toner particle diameter;
Above-mentioned table hand-off process is carried out each developer at the time pin of afore mentioned rules;
In this each the above-mentioned toner particle diameter of table in the hand-off process differentiated, utilization is corresponding to above-mentioned (benchmark fragment image color-toner particle diameter) relation table of the ink powder of developer, and the switching of above-mentioned (ink powder adhesion amount-sensor output) relation table is selected to carry out from above-mentioned a plurality of (ink powder adhesion amount-sensor output) relation table corresponding to the ink powder of developer.
Resemble coloured image at image processing system of the present invention and form and to possess under the situation of a plurality of developers the device,
Above-mentioned image color adjustment unit keeps above-mentioned a plurality of (ink powder adhesion amount-sensor output) relation table and above-mentioned (the benchmark fragment image color-toner particle diameter) relation table corresponding to toner particle diameter at every kind of ink powder of this each developer;
Time pin at afore mentioned rules carries out above-mentioned table hand-off process to each developer;
In this each the above-mentioned toner particle diameter of table in the hand-off process differentiated, utilization is corresponding to above-mentioned (benchmark fragment image color-toner particle diameter) relation table of the ink powder of developer, and the switching of above-mentioned (ink powder adhesion amount-sensor output) relation table is selected to carry out from above-mentioned a plurality of (ink powder adhesion amount-sensor output) relation table corresponding to the ink powder of developer.
The invention effect
As mentioned above, according to the present invention, image concentration stabilization control method in a kind of image processing system can be provided, the electrostatic latent image that this image processing system utilizes developer to make and is formed on the electrostatic latent image carrier develops with the formation ink powder image, and comprises: ink powder fragmentation pattern picture forms the fragmentation pattern picture image carrier of object; The fragment image formation unit forms the fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this fragmentation pattern picture; And image color detecting sensor, be formed on the concentration of this fragmentation pattern picture according to detecting from the reflected light of this fragment image reflection with the fragmentation pattern picture on the image carrier by looking like to carry out rayed to this fragmentation pattern, the development output of the fragmentation pattern picture that this sensor output on this image processing system can form to be made (ink powder adhesion amount-sensor output) relation table produces is as the benchmark output of developing, carry out the adjustment of ink powder image concentration, wherein, (ink powder adhesion amount-sensor output) relation table is represented the relation of this ink powder adhesion amount and the sensor output that looks like to obtain from this benchmark fragmentation pattern of the benchmark fragmentation pattern picture of the regulation ink powder adhesion amount that formed on image carrier at this fragmentation pattern picture by this fragment image formation unit, even this image concentration stabilization control method uses the particle diameter of ink powder to change, also can make the concentration stabilize of the ink powder image that will form.
In addition, according to the present invention, can provide a kind of image processing system, utilize developer to make to be formed on the electrostatic latent image on the electrostatic latent image carrier to develop to form ink powder image, comprising: ink powder fragmentation pattern picture forms the fragmentation pattern picture image carrier of object; The fragment image formation unit forms the fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this fragmentation pattern picture; The image color detecting sensor is formed on the concentration of this fragmentation pattern picture with the fragmentation pattern picture on the image carrier according to detecting from the reflected light of this fragment image reflection by looking like to carry out rayed to this fragmentation pattern; And the image color adjustment unit, this ink powder adhesion amount of the benchmark fragmentation pattern picture of this image color adjustment unit maintenance expression regulation ink powder adhesion amount and (ink powder adhesion amount-sensor output) relation table of the relation of the sensor output that looks like to obtain from this benchmark fragmentation pattern; The development output that can form the fragmentation pattern picture that makes the sensor output generation on this (ink powder adhesion amount-sensor output) relation table is as benchmark development output, carry out the adjustment of ink powder image concentration, even this image processing system uses the particle diameter of ink powder to change, also can make the concentration stabilize of the ink powder image that will form.
Description of drawings
Fig. 1 is the figure that expression can be implemented the image device example of the present invention of image concentration stabilization control of the present invention.
Fig. 2 is the figure of the structure summary of presentation video concentration detection sensor.
Fig. 3 is the block diagram that presentation video forms the control circuit of device, goes back the circuit structure of presentation video concentration detection sensor.
Fig. 4 is the ink powder adhesion amount of the fragmentation pattern picture on the expression intermediate transfer belt and the figure of relation (developing property) example of the output (developing bias voltage) of developing.
Fig. 5 represents the normal reflection light photo detector of ink powder adhesion amount on the fragmentation pattern picture and image color detecting sensor and the figure that concerns example of the photo detector detection output separately that diffuses at every kind of toner particle diameter.
Fig. 6 is the figure that concerns example that represents the output voltage difference of the detection output of the photo detector that diffuses (the detection output of normal reflection light photo detector with) of ink powder adhesion amount on the fragmentation pattern picture and image color detecting sensor at every kind of toner particle diameter.
The process flow diagram of the hand-off process of Fig. 7 (ink powder adhesion amount-sensor output) relation table that to be expression undertaken by control part shown in Figure 3.
Fig. 8 is the process flow diagram of other example of the action of expression control part shown in Figure 3.
Fig. 9 is the process flow diagram of other example of the action of expression control part shown in Figure 3.
Symbol description
A: color printer; Y: yellow processing unit; M: pinkish red processing unit; C: cyan processing unit; K: black processing unit; 11: photoreceptor; 12: charged device; 13: image exposing apparatus; 14: developer; 141: the development roller; PY, MY, CY, KY: developing bias voltage; 15: cleaning device; 2: the primary transfer roller; 31: driving roller; 32: opposed roller; 4: intermediate transfer belt; M1: transfer belt drive motor; 40: clearer; 51: the secondary transfer printing roller; 6: fixing device; 7: regularly roller is right; S1: Time Pick-off Units; 8: the recording medium accepting box; 81: medium is supplied with roller; 82: recording medium; 91: discharge roller; 9: discharge pallet; 10: the image color detecting sensor; 10 ': transparent panel; 10 ": housing; 10a: light-emitting component; 10b: normal reflection light photo detector; 10c: photo detector diffuses; Tp: ink powder fragmentation pattern picture; K: black processing unit; YC: yellow ink powder box; MC: magenta ink powder box; CC: cyan ink powder box; KC: black ink powder box; Cont: control part; Cont ': the image color detecting sensor concerns handling part; M, m ': storer; 100: guidance panel; 101: initiating key; 102: numerical key etc.; 103: the image color assignment key; 104: liquid crystal display part.
Embodiment
With reference to the description of drawings embodiments of the present invention.
Fig. 1 represents to implement the image processing system example of the present invention of image concentration stabilization control method of the present invention.
The image processing system of Fig. 1 is series connection (tandem) the type color printer A that can form coloured image.
Color printer A has the intermediate transfer belt for no reason 4 that twists on driving roller 31 and the roller opposed with it 32.The driving roller 31 that is driven by transfer belt drive motor M1 (with reference to Fig. 3) can make transfer belt 4 rotate along the counter clockwise direction among the figure (direction of arrow among the figure).
The clearer 40 that is used to clean secondary transfer printing residual toner on the transfer belt 4 etc. is in the face of the transfer belt part on the opposed roller 32.
Secondary transfer printing roller 51 is in the face of the transfer belt part on the driving roller 31.Secondary transfer printing roller 51 can be by omitting illustrated roller mobile unit in 4 contacts of the relative transfer belt of predetermined timing or deviate from.Can apply the secondary transfer printing biasing to secondary transfer printing roller 51 from omitting illustrated secondary transfer printing bias supply.Constitute secondary transfer printing device 5 (with reference to Fig. 3) by this transfer printing roller 51, roller mobile unit, secondary transfer printing bias supply etc.
Below secondary transfer printing roller 51, dispose regularly roller to 7, dispose the recording medium accepting box 8 of having accommodated recording medium below more at it.At the timing roller Time Pick-off Units s1 is disposed in 7 outlet.Time Pick-off Units s1 detects recording medium 82 and arrives the timing roller to 7, and this medium detection information is transfused to control part Cont described later (with reference to Fig. 3).
Above transfer printing roller 5, dispose fixing device 6.
Be housed in recording medium 82 in the recording medium accepting box 8 and can supply with roller 81 by medium and draw one by one, and supply with regularly roller 7.
As recording medium 82, can exemplify out recording chart, projector with thin slice etc.
Between the roller 31,32 of rolling up intermediate transfer belt 4,, to roller 31, yellow processing unit Y, pinkish red processing unit M, cyan processing unit C and black processing unit K are disposed in order from roller 32 along transfer belt 4.
The each processing unit of Y, M, C, K has the photoreceptor 11 of drum type as electrostatic latent image carrier, around this photoreceptor, charged device 12, image exposing apparatus 13, developer 14, primary transfer roller 2, be used to remove and clean the configurations in order such as cleaning device 15 of the primary transfer residual toner on the photoreceptor.
Supply with ink powder from the developer 14 of removable powder box to each processing unit.Promptly, supply with Yellow ink powder from powder box YC to the developer 14 of unit Y, supply with pinkish red ink powder from powder box MC to the developer 14 of unit M, supply with the cyan ink powder to the developer 14 of unit C, supply with powdered black ink to the developer 14 of unit K from powder box KC from powder box CC.
Primary transfer roller 2 sandwich transfer belt 4 are opposed with photoreceptor 11, rotate with advancing of transfer belt drivenly.Can apply to primary transfer roller 2 and be used for and be formed on ink powder on the photoreceptor 11 as the primary transfer biasing of primary transfer on the transfer belt 4 from omitting illustrated primary transfer bias supply.
Exposure device 13 utilizes laser beam to implement image exposure on photoreceptor 11 according to from omitting the image information that illustrated personal computer etc. provides.
Photoreceptor 11 in the each processing unit is the negative charging photoreceptor here, can drive along clockwise direction among the figure (direction of arrow among the figure) rotation by omitting illustrated photoreceptor drive motor.
Illustratedly chargedly apply electrified voltage at the charged device 12 of predetermined timing to each processing unit from omitting with supply unit.
Developer 14 in the each processing unit adopts the negative charging ink powder in this example, can utilize by developing bias power supply shown in Figure 3 (among the unit Y among power supply PY, the unit M among power supply PM, the unit C for being power supply PK among power supply PC, the unit K) the development roller 141 that applied developing bias voltage makes the electrostatic latent image that is formed on the photoreceptor 11 carry out discharged-area development.
Between the driving roller 31 of black processing unit K and transfer belt 4, dispose image color detecting sensor 10.The sensor that the detection information of sensor 10 is imported into control part Cont (with reference to Fig. 3) concerns control part Cont '.The part that comprises this control part Cont ' among the control part Cont constitutes ink powder image concentration adjustment unit.
As shown in Figure 3, be connected with on the control part Cont processing unit of Y, M, C, K, regularly roller to 7, transfer belt drive motor M1, the transfer device 5 that comprises secondary transfer printing roller 51 etc., fixing device 6 etc., they regularly move in the regulation that can carry out image formation etc. according to the indication of control part Cont.
Also be connected with the guidance panel 100 of image processing system on the control part Cont.Be equipped with indicating image on the guidance panel 100 and form the key 103 of the initiating key 101 of beginning, the numerical key etc. 102 that carries out various setting values etc., specify image concentration and liquid crystal display part 104 etc.
According to printer A, behind the initiating key on the push panel 100 101, according to the indication of control part Cont, use in Y, M, C, the K processing unit 1 or 2 with on carry out image and form.
Be example with the situation of using whole unit Y, M, C and K to form full-color image, at first, in yellow processing unit Y, form the Yellow ink powder picture, and it once is transferred on the transfer belt 4.
Promptly, in unit Y, drive photoreceptor 11 along clockwise direction rotation among the figure, from image exposing apparatus 13 to utilizing charged device 12 to make this charging zone of the consistent charged photoreceptor 11 behind the regulation current potential in surface implement the image exposure that yellow image is used, thereby on photoreceptor 11, form the yellow electrostatic latent image.
This electrostatic latent image is developed by the development roller that has been applied in developing bias 141 of the developer 14 with Yellow ink powder, becomes visual Yellow ink powder picture, this ink powder picture by primary transfer roller 2 primary transfer on transfer belt 4.At this moment, apply the primary transfer bias voltage from omitting illustrated power supply to primary transfer roller 2.
Equally, in processing unit M, form the magenta ink dust figure, and be transferred on the transfer belt 4, in processing unit C, form the cyan ink dust figure, and be transferred on the transfer belt 4, in processing unit K, form the powdered black ink picture, and be transferred on the transfer belt 4.
Yellow, magenta, cyan, powdered black ink picture are in the overlapping timing form that is transferred on the intermediate transfer belt 4 with them.The multiple ink powder picture that is formed on the transfer belt 4 moves to secondary transfer printing roller 51 by the rotation of transfer belt 4.
On the other hand, recording medium 82 is supplied with roller 81 by medium and is drawn from recording medium accepting box 8, supplies with that regularly roller is to 7, and s1 detects by Time Pick-off Units, thereby stops and in this position standby.
For at the recording medium 82 of timing roller to the standby of 7 places, in order to look like to combine with the multiple ink powder of sending here by intermediate transfer belt 4, supply with the clamping part (nip) of transfer belt 4 and the secondary transfer printing roller 51 that has contacted with transfer belt 4, regularly roller begins to transport recording medium 82 to 7, thereby send into this clamping part, utilize from omit secondary transfer printing roller 51 that illustrated power supply applied the secondary transfer printing biasing should multiple ink powder as secondary transfer printing to recording medium 82.
Then, recording medium 82 is by fixing device 6, there under heating and pressurizing with multiple ink powder as photographic fixing on recording medium.Recording medium 82 continues to discharge to discharging pallet 9 by discharging roller 91.Remain in transfer printing residual toner on the intermediate transfer belt 4 etc. and remove and clean, manage transfer printing residual toner of remaining in the unit on the photoreceptor 11 etc. throughout and remove and clean by cleaning device 15 by clearer 40.
Control of＜image concentration stabilization and ink powder image concentration are adjusted 〉
In this printer A, utilize that image color detecting sensor 10 etc. is following carries out image concentration stabilization control.Below, comprise being explained the detailed structure of sensor 10.
Image color detecting sensor 10 is used to detect the fragmentation pattern that is formed on the ink powder on the transfer belt 4 concentration as Tp (for example being the tetragonal image about 10mm on one side) as shown in Figure 2.
The fragmentation pattern picture can utilize Y, M, C, K processing unit, forms at ink powder of all kinds.Form fragmentation pattern as the time, secondary transfer printing roller 51 leaves from transfer belt 4, has passed through the fragmentation pattern picture of sensor 10 and has been removed from transfer belt 4 by clearer 40.
Sensor 10 comprises to the ink powder fragmentation pattern that is formed on the transfer belt 4 and carries out light-struck light-emitting component 10a, receives from the normal reflection light photo detector 10b of the normal reflection light component of image Tp and receive the photo detector 10c that diffuses from the composition that diffuses of image Tp as Tp as shown in Figure 2.These elements 10a, 10b and 10c are placed into sensor housing 10 " in, and from the window side that is provided with transparent panel 10 ' to fragmentation pattern as Tp.Transparent panel 10 ' is formed by light transmission good resin or clear glass.Transparent panel 10 ' is used to prevent adhere to ink powder or dust on element.
Is the situation of θ under to fragmentation pattern as the incident angle of the light path Pa of Tp establishing from light-emitting component 10a, and the light path Pb that returns from image reflection with reflection angle θ is the normal reflection light path, configuration normal reflection light photo detector 10b on this light path.In addition, the catoptrical light path Pc that forms the angle θ ' different with incident angle θ is the light path that diffuses that detects from image Tp, disposes the photo detector 10c that diffuses on this light path.In this example, light-emitting component 10a is light emitting diode (LED).Each photo detector is a photodiode.
Sensor 10 also comprises with lower member etc.That is, as shown in Figure 3, the transistor Tr, electric current limiting resistance R1, base resistance R2, normal reflection light quantity opto-electronic conversion that comprises the electric current of control light-emitting component 10a is with resistance R3, diffuse reflection light quantity opto-electronic conversion resistance R 4, DC5V power input terminal t etc.
To image Tp irradiation from the LED light Pa of the light-emitting component 10a convergence of the sensor 10 of transfer belt 4 relative configurations, receive the normal reflection light Pb of this moment by photo detector 10b from image Tp, and receive the Pc that diffuses by photo detector 10c, this normal reflection light Pb and the Pc that diffuses are carried out opto-electronic conversion, detect the image color of ink powder fragmentation pattern thus as Tp.
The output of sensor 10 is imported into analog/digital port A/D1, the A/D2 that sensor among the control part Cont concerns control part Cont ' respectively as the light quantity conversion output voltage V C of the opto-electronic conversion output voltage V B of normal reflection light quantity and diffuse reflection light quantity.
If further specify, then the aanalogvoltage of the digital-to-analog port D/A by utilizing control part Cont ' sets the base current of oxide-semiconductor control transistors Tr, can determine to flow to the magnitude of current of light-emitting component 10a, thereby control the light quantity of this element.Light quantity in accordance with regulations makes light-emitting component 10a luminous, is radiated at fragmentation pattern on the transfer belt 4 as on the Tp face, and is received to receive from the just emission light of image Tp face, by photo detector 10c this moment by photo detector 10b respectively and diffuse.Corresponding to this light income, electric current flows in photo detector 10b, 10c, carry out opto-electronic conversion by opto-electronic conversion separately with resistance R3, R4, as detecting voltage, be equivalent to the voltage of the normal reflection light quantity that the port A/D1 by control part Cont ' receives and the voltage of the diffuse reflection light quantity that is equivalent to be received by port A/D2 is transfused to as aanalogvoltage.
When fragmentation pattern is low as the ink powder concentration of Tp, many from normal reflection light quantity, the diffuse reflection light quantity is few as 4 of the transfer belt of normal reflection member.That is the opto-electronic conversion output voltage V B of normal reflection light quantity, is big, the opto-electronic conversion output voltage V C of diffuse reflection light quantity is little.When ink powder concentration is high, few from the normal reflection light quantity of 4 of transfer belt, the diffuse reflection light quantity is big.That is the opto-electronic conversion output voltage V B of normal reflection light quantity, is little, the opto-electronic conversion output voltage V C of diffuse reflection light quantity is big.
Control part Cont ' carries out corresponding to the detection voltage of the light quantity that is received by normal reflection light photo detector 10b and calculus of differences corresponding to the detection voltage of the light quantity that is received by the photo detector 10c that diffuses.
The difference of calculating is exported as the sensor relevant with (ink powder adhesion amount-sensor output) described later relation table.
In addition, control part Cont ' also calculates the ratio (photo detector output is exported/diffused to normal reflection light photo detector) of output with the output of photo detector 10c of photo detector 10b.The ratio of being calculated is as this benchmark fragment image color (by sensor 10 detected benchmark fragment image colors) that is used for differentiating (benchmark fragment image color-toner particle diameter) relation table of toner particle diameter described later.
In the ink powder image concentration control (image concentration stabilization control) in printer A, when utilizing sensor 10 to detect ink powder fragmentation pattern on the transfer belt 4 as the concentration of Tp, make light-emitting component 10a luminous in this example in advance to naked of transfer belt 4, and the luminous quantity of control light-emitting component 10a, make corresponding to receive by photo detector 10b, from the detection voltage of the normal reflection light quantity of naked of transfer belt with receive by photo detector 10c, be predetermined value from the calculus of differences result of the detection voltage of the diffuse reflection light quantity of naked of transfer belt.This control is to carry out according to the indication of control part Cont '.The naked face of transfer belt 4 is normal reflection member faces, thereby the normal reflection light income is preponderated.
On the other hand, wait to generate this ink powder adhesion amount and (ink powder adhesion amount-sensor output) relation table of the benchmark fragmentation pattern picture of expression regulation ink powder adhesion amount in advance by test, and be stored in the sensor and concern among the storer m of control part Cont ' corresponding to the relation of the sensor output (difference of the output of above-mentioned photo detector 10b, 10c) of the concentration of this benchmark fragmentation pattern picture.Be somebody's turn to do the various ink powders of (ink powder adhesion amount-sensor output) relation table, generate the corresponding relation table of particle diameter a plurality of and the use ink powder at yellow, magenta, cyan, black.Here generating toner particle diameter at ink powder of all kinds is these 3 kinds (ink powder adhesion amount-sensor output) relation tables of table that adopt under the table that adopts under the table that adopts under the situation of the regular particle diameter in the setting range, the situation of toner particle diameter greater than regular particle diameter, the situation of toner particle diameter less than regular particle diameter, and is stored among the storer m.
Here " toner particle diameter " is meant average toner particle diameter.
In addition, " the regulation ink powder adhesion amount of benchmark fragmentation pattern picture " here is meant predetermined fixedly ink powder state of saturation adhesion amount.
In addition, " sensor output " here is meant " the calculus of differences result " among the above-mentioned handling part Cont ' as mentioned above.
Adopt such the reasons are as follows corresponding to a plurality of (ink powder adhesion amount-sensor output) relation tables that use toner particle diameter.That is, even the ink powder adhesion amount on this benchmark fragmentation pattern picture is identical, the output (above-mentioned difference) of the sensor 10 that looks like to obtain from the fixing benchmark fragmentation pattern of ink powder state of saturation adhesion amount is little when toner particle diameter is big, hour big at toner particle diameter.This point will further specify in the back.
In addition, (benchmark fragment image color-toner particle diameter) relation table of relation between the particle diameter of benchmark fragment image color that obtains from the benchmark fragment image detection of regulation ink powder adhesion amount (above-mentioned fixedly ink powder state of saturation adhesion amount) by sensor 10 by generations such as test expressions and the ink powder on this fragmentation pattern picture in advance, and be stored in the sensor and concern among the storer m of control part Cont '.Should be formed and stored in the storer at the various ink powders of yellow, magenta, cyan, black by (benchmark fragment image color-toner particle diameter) relation table.
Here " toner particle diameter " is meant average toner particle diameter with above-mentioned same.
In addition, " benchmark fragment image color " is the ratio (photo detector output is exported/diffused to normal reflection light photo detector) of the output of the output of above-mentioned photo detector 10b and photo detector 10c at this.
(the benchmark fragment image color-toner particle diameter) relation table here is according to following true the generation: even the ink powder adhesion amount on this benchmark fragmentation pattern picture is identical, little when toner particle diameter is big by the concentration (above-mentioned ratio) of sensor 10 detected benchmark fragmentation pattern pictures, hour big at toner particle diameter.
Be the table that can make the following judgment furtherly: if the particle diameter that uses ink powder in setting range, then benchmark fragment image color (above-mentioned ratio) is just under the situation in specialized range, need only by sensor 10 detected these benchmark fragment image colors (above-mentioned ratio) in specialized range, then just can be judged as and use toner particle diameter is interior regular (regulation) particle diameter of setting range, when less than the concentration in this specialized range, can be judged as is particle diameter greater than regular particle diameter, when greater than the concentration in this specialized range, can be judged as is particle diameter less than regular particle diameter.
Even the ink powder adhesion amount that the back will further specify on the benchmark fragmentation pattern picture is identical, when toner particle diameter changed, sensor output (above-mentioned ratio) changed.
Then, indication according to control part Cont, in predetermined timing, on above-mentioned intermediate transfer belt 4, form the benchmark fragmentation pattern of predetermined fixedly ink powder state of saturation adhesion amount as Tp, detect the concentration of this benchmark fragmentation pattern picture by image color detecting sensor 10, concentration and pre-prepd (benchmark fragment image color-toner particle diameter) relation table according to this benchmark fragmentation pattern picture that detects by this image color detecting sensor, differentiate to use the particle diameter of ink powder, go forward side by side and be about to (ink powder adhesion amount-sensor output) relation table and switch in the middle of 3 kinds of (ink powder adhesion amount-sensor output) relation tables at this ink powder, differentiate the table hand-off process of result's toner particle diameter corresponding (ink powder adhesion amount-sensor output) relation table with this.This hand-off process also comprises the situation of (ink powder adhesion amount-sensor output) relation table that direct use is present.
The action of the control part Cont relevant shown in Fig. 7 with this table hand-off process.
Promptly, utilize transfer belt drive motor M1 (with reference to Fig. 3) to drive intermediate transfer belt 4 (step S1), the light-emitting component 10a of sensor 10 is lighted, and, begin light (step S2) from the little state of the luminous quantity of this element this moment, then, make the normal reflection light (step S3) of photo detector 10b reception from 4 naked of transfer belt, make the luminous quantity of light-emitting component 10a increase ormal weight (step S4) at every turn, if the normal reflection light quantity that photo detector 10b has received regulation (in other words, if the luminous quantity of light-emitting component 10a reaches ormal weight) (step S5), then on transfer belt 4, form high (above-mentioned predetermined fixedly ink powder state of saturation adhesion amount) the benchmark fragmentation pattern picture (step S6) of ink powder adhesion amount.
And then, make photo detector 10b, 10c detects respectively from the normal reflection light quantity of this fragmentation pattern picture and diffuse reflection light quantity (step S7), according to its testing result, calculate ratio (the normal reflection light quantity/diffuse reflection light quantity of normal reflection light quantity and diffuse reflection light quantity, in other words, photo detector 10b output/photo detector 10c output) (step S8), represent this ratio (sensor output) and above-mentioned (benchmark fragment image color-toner particle diameter) relation table of the sensor concentration of benchmark fragmentation pattern picture according to this, differentiate the particle diameter that uses ink powder, and be stored in (step S9) among the storer m ', with the image stabilization control table, promptly (ink powder adhesion amount-sensor output) relation table switches to the corresponding table of toner particle diameter (step S10) of differentiating the result with this particle diameter.
Then, to satisfy the development output of condition of (ink powder adhesion amount-sensor output) relation table that this switching selects as the benchmark output of developing, adjust the output of developing by control part Cont, to obtain adjusting the ink powder image concentration of key 103 appointments by the concentration on the guidance panel 100.Here " develop output adjustment " is meant adjusts at least one in the left and right sides essential factor that the carried charge of the exposure of photoreceptor 11, the photoreceptor 11 that caused by charged device 12, the developing bias on the developer 14 etc. develop of image exposing apparatus 13.
Like this, can be corresponding to the particle diameter that uses ink powder, to be used to determine that (ink powder adhesion amount-sensor output) relation table of benchmark development output switches to (ink powder adhesion amount-sensor output) relation table that adapts with this toner particle diameter, and according to (ink powder adhesion amount-sensor output) relation table after this switching, carry out the adjustment of ink powder image concentration, therefore the concentration stabilize of the ink powder image that forms like this.
In addition, control part Cont is somebody's turn to do the hand-off process of (ink powder adhesion amount-sensor output) relation table in predetermined timing at each developer.
Such hand-off process regularly is in this example: when having connected the main switch of image processing system; When having loaded new powder box at powder box YC, MC, CC, KC; When having changed such powder box; And image is when forming number and having reached the regulation number.
In this example, when having loaded new powder box, only carry out only showing hand-off process at the developer 14 of accepting the ink powder supply from this powder box, as long as but also can be the new powder box that has loaded the ink powder of any one color, just all developers 14 are shown hand-off process.
In addition, in this example, only when having changed powder box, only carry out accepting the developer 14 that ink powder supplies with and show hand-off process at the powder box after this replacing, as long as but also can be the powder box of having changed the ink powder of any one color, just all developers 14 are shown hand-off process.
When having connected the main switch of image processing system and when image formation number has reached the regulation number, can show hand-off process at all developers 14.
In addition, control part Cont is in process flow diagram shown in Figure 7, after step S8, can be as shown in Figure 8, whether sensor that judgement is calculated in step S8 output (ratio) is in the setting scope (step S81), if outside the setting scope, then on the display part 104 of guidance panel 100, show " please be replaced with the powder box of regulation " such message (step S82), also can be as shown in Figure 9, whether sensor that judgement is calculated in step S8 output (ratio) is in the setting scope (step S83), if outside the setting scope, then increase from the relevant deterioration ink powder of developer 14 on photoreceptor 11 number of times that spues, employing also can combine them.In addition, the deterioration ink powder that spues on photoreceptor 11 is recycled in the cleaning device 15.
Below further specify above-mentioned (ink powder adhesion amount-sensor output) generation of relation table and generation of above-mentioned (benchmark fragment image color-toner particle diameter) relation table corresponding to the use toner particle diameter.It is the situation of magenta ink powder that the following description is to use ink powder, but, can generate too corresponding to (ink powder adhesion amount-sensor output) relation table and (the benchmark fragment image color-toner particle diameter) relation table that uses toner particle diameter for the ink powder of other color.
The developing property of the A of printer shown in Fig. 4.
The ink powder adhesion amount that is formed on the ink powder image on the transfer belt 4 is such as illustrated in Figure 4, for example developing bias voltage is set high more then manyly more, but at adhesion amount 7.5g/m 2Near, improving the output of developing again even form, the ink powder adhesion amount does not rise and saturated zone yet.Here adopt near the stable ink powder adhesion amount (the saturated adhesion amount of ink powder) in this zone as this ink powder adhesion amount on the benchmark fragmentation pattern picture of regulation ink powder adhesion amount.
Fig. 5 represents that the normal reflection light income of ink powder adhesion amount and photo detector 10b detects the relation of output VB, in Fig. 5, the situation of representing regulation toner particle diameter (average toner particle diameter is 5.0 μ m ± 0.5 μ m) with line L1, represent the situation of the ink powder that particle diameter ratio regulation toner particle diameter is little with line L2, represent the situation of the ink powder that particle diameter ratio regulation toner particle diameter is big with line L3.
Fig. 5 represents that also the diffuse reflection light income of ink powder adhesion amount and photo detector 10c detects the relation of output VC, in Fig. 5, use the situation of line L1 ' expression regulation toner particle diameter, use the situation of the little ink powder of line L2 ' expression particle diameter ratio regulation toner particle diameter, use the situation of the big ink powder of line L3 ' expression particle diameter ratio regulation toner particle diameter.
As can be seen from Figure 5, the ink powder adhesion amount is 6.5g/m 2～7.5g/m 2High adhering zone H be the stable zone of ratio of normal reflection, diffuse reflection light income.Thereby here also according to above-mentioned developing property, (for example making the ink powder adhesion amount is 7.5g/m to adopt fixing in fact ink powder adhesion amount (the saturated adhesion amount of ink powder) in this zone 2About), as this ink powder adhesion amount on the benchmark fragmentation pattern picture of regulation ink powder adhesion amount.
It is 7.5g/m that following table is expressed the ink powder adhesion amount 2The time toner particle diameter and the ratio of the output valve (V) of sensor 10b, the 10c of normal reflection light quantity, diffuse reflection light quantity and normal reflection light income and diffuse reflection light income.
[table 1]
Figure S071A2589620070525D000211
From this table as can be known, with the ink powder and the 7.5g/m of regulation particle diameter 2The ink powder adhesion amount under the situation that forms benchmark fragmentation pattern picture on the transfer belt, the normal reflection light income is 0.057/0.066=0.86 with the ratio of diffuse reflection light income.
With ink powder and the 7.5g/m of particle diameter less than the regulation particle diameter 2The ink powder adhesion amount under the situation that forms benchmark fragmentation pattern picture on the transfer belt, the normal reflection light income is 0.068/0.069=0.99 with the ratio of diffuse reflection light income.
With ink powder and the 7.5g/m of particle diameter greater than the regulation particle diameter 2The ink powder adhesion amount under the situation that forms benchmark fragmentation pattern picture on the transfer belt, the normal reflection light income is 0.046/0.063=0.73 with the ratio of diffuse reflection light income.
With this ratio as the reference sensor output that is used to differentiate toner particle diameter, will be 0.795 or more in this sensor output (ratio), 0.925 represent to use when following toner particle diameter as the regulation particle diameter, this sensor output (ratio) represented less than 0.795 o'clock to use toner particle diameter greater than the regulation particle diameter, export (ratio) at this sensor and represented to use toner particle diameter to be stored among the storer m of handling part Cont ' greater than 0.925 o'clock less than (sensor is exported (ratio)-toner particle diameter) relation table of regulation particle diameter.Should be equivalent to above-mentioned (benchmark fragment image color-toner particle diameter) relation table by (sensor output (ratio)-toner particle diameter) relation table.
Under the situation of the ink powder in the high adhesion amount zone of the zone of saturation of the developing property more than the ink powder adhesion amount, as shown in Figure 5, the normal reflection light quantity has the tendency of increase, and, shown in above-mentioned table, because the difference of toner particle diameter, from the normal reflection light quantity difference of toner surface.
This is further detailed.The relation of the ink powder adhesion amount on the fragmentation pattern picture that the ink powder of the various toner particle diameters of the regulation of utilization shown in Fig. 6 particle diameter, small particle diameter, big particle diameter generates and the output voltage of sensor 10.The sensor output voltage here is to be equivalent to detect input VB and from the voltage of photo detector 10c to the difference of the diffuse reflection light quantity detection input VC of handling part Cont ' input, utilize handling part Cont ' to amplify the output voltage (Vo) of this differentiated voltage as sensor 10 shown in Fig. 6 from the normal reflection light quantity that photo detector 10b imports to handling part Cont '.
That is, illustrate and utilize that handling part Cont ' is concrete to be calculated based on the result behind the ink powder adhesion amount of toner particle diameter shown in Figure 5 and normal reflection, the diffuse reflection light income.In addition, use naked as the transfer belt 4 of normal reflection member, adjust the light quantity of sensor light-emitting component 10a, the operation result after making the difference of normal reflection light quantity-diffuse reflection light quantity be exaggerated is Vo=4.5V.
In Fig. 6, characteristic a represents that toner particle diameter is the situation of specialized range, and characteristic b represents the situation that toner particle diameter is little, and characteristic c represents the situation that toner particle diameter is big.
As can be known, 6.5g/m 2～7.5g/m 2High adhering zone H from the reflection light quantity of benchmark fragmentation pattern picture especially because the difference of toner particle diameter, the variation of normal reflection light quantity is bigger than the variation of diffuse reflection light quantity.This is because the more little ink powder of particle diameter is big more from the normal reflection light quantity of toner surface.
Transfer printing zone face originally is a normal reflection member face, but at 6.5g/m 2～7.5g/m 2The high adhering zone H of ink powder in, layer of toner covers the transfer printing zone face, the normal reflection light quantity should be considerably less, but the tendency of increase is partly arranged from the normal reflection of toner surface.Therefore, based on this characteristic, the ratio of normal reflection light quantity and diffuse reflection light quantity changes corresponding to toner particle diameter, therefore can differentiate the size of toner particle diameter.
Can differentiate the particle diameter of ink powder thus, therefore by at every kind of toner particle diameter can differentiating from the relation of the ink powder adhesion amount of each toner particle diameter shown in Figure 6 and sensor output voltage, switch (ink powder adhesion amount-sensor output) relation table, carry out image stabilization control, can form stable preferable image.
Following table is represented the relation of the ink powder adhesion amount of various toner particle diameters and the output voltage of sensor 10 (voltage that is equivalent to difference).
[table 2]
Figure S071A2589620070525D000231
From this table as can be known, even the ink powder adhesion amount on the fragmentation pattern picture is identical, if use the particle diameter difference of ink powder, then the output of sensor 10 changes.Thereby, as expression ink powder adhesion amount 6.5g/m 2～7.5g/m 2Scope in the predetermined saturated adhesion amount of fixedly ink powder (7.5g/m for example 2) (ink powder adhesion amount-sensor output) relation table of this ink powder adhesion amount and the relation of the output (above-mentioned difference) of the sensor 10 that looks like to obtain from this fragmentation pattern of benchmark fragmentation pattern picture, these 3 kinds of tables of table that table that the table that adopts when the particle diameter that uses ink powder that will can differentiate as mentioned above is as specialized range here, toner particle diameter adopt for less than the path of specialized range time the and toner particle diameter adopt for greater than the big footpath of specialized range the time are stored among the storer m.
Then, (ink powder adhesion amount-sensor output) relation table is switched to table and the employing of differentiating result's toner particle diameter corresponding to toner particle diameter.Like this, even when toner particle diameter reaches certain number etc. and changes owing to input, the replacing of powder box, the image of new powder box forms number, also can form the stable good ink powder image of image color.
In the printer A of above explanation, image color detecting sensor 10 adopts the element that comprises the normal reflection light photo detector 10b and the photo detector 10c that diffuses as photo detector, as long as but obtain concentration (ink powder adhesion amount) and corresponding to the output of the sensor of toner particle diameter, then photo detector also can be one corresponding to the fragmentation pattern picture.
Utilizability on the industry
The present invention can be used for providing the image processing system formation ink powder image, can carry out corresponding to the particle diameter that uses ink powder Stabilization Control to the concentration of formed ink powder image.

Claims (16)

1. the image concentration stabilization control method in the image processing system, the electrostatic latent image that this image processing system utilizes developer to make and is formed on the electrostatic latent image carrier develops with the formation ink powder image, and comprises: ink powder benchmark fragmentation pattern picture forms the benchmark fragmentation pattern picture image carrier of object; Benchmark fragment image formation unit forms the benchmark fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this benchmark fragmentation pattern picture; And image color detecting sensor, be formed on the concentration of this benchmark fragmentation pattern picture according to detecting from the reflected light of this benchmark fragment image reflection with the benchmark fragmentation pattern picture on the image carrier by looking like to carry out rayed to this benchmark fragmentation pattern, this image processing system can form the development output of the benchmark fragmentation pattern picture that makes this sensor output generation on ink powder adhesion amount-sensor output relation table as benchmark development output, carry out the adjustment of ink powder image concentration, wherein, above-mentioned ink powder adhesion amount-sensor output relation table is represented the relation of this ink powder adhesion amount and the output of the sensor that looks like to obtain from this benchmark fragmentation pattern of the benchmark fragmentation pattern picture of the regulation ink powder adhesion amount that formed on image carrier at this benchmark fragmentation pattern picture by this benchmark fragment image formation unit, and this image concentration stabilization control method comprises:
A plurality of ink powder adhesion amounts-sensor output relation table that preparation generates corresponding to toner particle diameter is as above-mentioned ink powder adhesion amount-sensor output relation table; And
When predetermined, be engraved in said reference fragmentation pattern picture by said reference fragment image formation unit and form the benchmark fragmentation pattern picture of ink powder state of saturation adhesion amount as said reference fragmentation pattern picture on image carrier, detect the concentration of this benchmark fragmentation pattern picture by above-mentioned image color detecting sensor, according to concentration and pre-prepd benchmark fragment image color-toner particle diameter relation table by detected this benchmark fragmentation pattern picture of this image color detecting sensor, differentiate to use the particle diameter of ink powder, go forward side by side and be about to ink powder adhesion amount-sensor output relation table and switch in above-mentioned a plurality of ink powder adhesion amount-sensor output relation table, differentiate the table hand-off process of ink powder adhesion amount-sensor output relation table of result's toner particle diameter corresponding to this.
2. image concentration stabilization control method as claimed in claim 1, wherein,
Above-mentioned image color detecting sensor comprises to the said reference fragmentation pattern and looks like to carry out light-struck light-emitting component and receive catoptrical photo detector from this benchmark fragmentation pattern picture that the output of the sensor is obtained according to the output of this photo detector.
3. image concentration stabilization control method as claimed in claim 2, wherein,
Above-mentioned image color detecting sensor comprises reception from the normal reflection light photo detector of the normal reflection light of said reference fragmentation pattern picture with receive the photo detector that diffuses that diffuses as above-mentioned photo detector, and the output of the sensor is obtained according to the output of this normal reflection light photo detector and the output of this photo detector that diffuses.
4. image concentration stabilization control method as claimed in claim 3, wherein,
Calculate the difference of the output of the output of above-mentioned normal reflection light photo detector and the above-mentioned photo detector that diffuses, adopt this difference as this sensor output in above-mentioned ink powder adhesion amount-sensor output relation table.
5. as claim 3 or 4 described image concentration stabilization control methods, wherein,
Calculate the ratio of the output of the output of above-mentioned normal reflection light photo detector and the above-mentioned photo detector that diffuses, be the output of the output/photo detector that diffuses of normal reflection light photo detector, adopt this ratio as this benchmark fragment image color in said reference fragment image color-toner particle diameter relation table.
6. image concentration stabilization control method as claimed in claim 1, wherein,
Above-mentioned image processing system adopts removable powder box from ink powder to above-mentioned developer that supply with, and above-mentioned table hand-off process was carried out in the moment of changing this powder box.
7. image concentration stabilization control method as claimed in claim 1, wherein,
Above-mentioned table hand-off process was carried out in the moment that image formation number reaches the regulation number.
8. image concentration stabilization control method as claimed in claim 1, wherein,
A plurality of above-mentioned developers are set in above-mentioned image processing system;
At every kind of ink powder of this each developer, prepare above-mentioned a plurality of ink powder adhesion amounts-sensor output relation table and said reference fragment image color-toner particle diameter relation table corresponding to toner particle diameter;
Above-mentioned table hand-off process was carried out at each developer in the above-mentioned predetermined moment;
In this each the above-mentioned toner particle diameter of table in the hand-off process differentiated, utilization is corresponding to the said reference fragment image color-toner particle diameter relation table of the ink powder of developer, and the switching of above-mentioned ink powder adhesion amount-sensor output relation table is selected to carry out from the above-mentioned a plurality of ink powder adhesion amounts-sensor output relation table corresponding to the ink powder of developer.
9. image processing system, the electrostatic latent image that utilizes developer to make to be formed on the electrostatic latent image carrier develops to form ink powder image, comprising:
Ink powder benchmark fragmentation pattern picture forms the benchmark fragmentation pattern picture image carrier of object;
Benchmark fragment image formation unit forms the benchmark fragmentation pattern picture of ink powder and comprises above-mentioned developer on image carrier at this benchmark fragmentation pattern picture;
The image color detecting sensor is formed on the concentration of this benchmark fragmentation pattern picture with the benchmark fragmentation pattern picture on the image carrier according to detecting from the reflected light of this benchmark fragment image reflection by looking like to carry out rayed to this benchmark fragmentation pattern; And
The image color adjustment unit,
Wherein, this image color adjustment unit
This ink powder adhesion amount of the benchmark fragmentation pattern picture of maintenance expression regulation ink powder adhesion amount and the ink powder adhesion amount-sensor output relation table of the relation of the output of the sensor that looks like to obtain from this benchmark fragmentation pattern;
The development that can form the benchmark fragmentation pattern picture of the sensor output generation that makes on this ink powder adhesion amount-sensor output relation table is exported as benchmark development output, carries out the adjustment of ink powder image concentration,
Above-mentioned image color adjustment unit also
A plurality of ink powder adhesion amounts-sensor output relation table that maintenance generates corresponding to toner particle diameter is as above-mentioned ink powder adhesion amount-sensor output relation table;
Make said reference fragment image formation unit when predetermined, be engraved in said reference fragmentation pattern picture and form the benchmark fragmentation pattern picture of ink powder state of saturation adhesion amount as said reference fragmentation pattern picture on image carrier, according to by the concentration of detected this benchmark fragmentation pattern picture of above-mentioned image color detecting sensor with the benchmark fragment image color-toner particle diameter relation table that keeps in advance, differentiate to use the particle diameter of ink powder, go forward side by side and be about to ink powder adhesion amount-sensor output relation table and switch in above-mentioned a plurality of ink powder adhesion amount-sensor output relation table, differentiate the table hand-off process of ink powder adhesion amount-sensor output relation table of result's toner particle diameter corresponding to this.
10. image processing system as claimed in claim 9, wherein,
Above-mentioned image color detecting sensor comprises to the said reference fragmentation pattern and looks like to carry out light-struck light-emitting component and receive catoptrical photo detector from this benchmark fragmentation pattern picture that the output of the sensor is obtained according to the output of this photo detector.
11. image processing system as claimed in claim 10, wherein,
Above-mentioned image color detecting sensor comprises reception from the normal reflection light photo detector of the normal reflection light of said reference fragmentation pattern picture with receive the photo detector that diffuses that diffuses as above-mentioned photo detector, and the output of the sensor is obtained according to the output of this normal reflection light photo detector and the output of this photo detector that diffuses.
12. image processing system as claimed in claim 11, wherein,
Above-mentioned image color adjustment unit is calculated the difference of the output of the output of above-mentioned normal reflection light photo detector and the above-mentioned photo detector that diffuses, and adopts this difference as this sensor output in above-mentioned ink powder adhesion amount-sensor output relation table.
13. as claim 11 or 12 described image processing systems, wherein,
Above-mentioned image color adjustment unit is calculated the ratio of the output of the output of above-mentioned normal reflection light photo detector and the above-mentioned photo detector that diffuses, be the output of the output/photo detector that diffuses of normal reflection light photo detector, adopt this ratio as this benchmark fragment image color in said reference fragment image color-toner particle diameter relation table.
14. image processing system as claimed in claim 9, wherein,
Employing is to the removable powder box of above-mentioned developer supply ink powder, and above-mentioned image color adjustment unit carries out above-mentioned table hand-off process in the moment that this powder box is replaced.
15. image processing system as claimed in claim 9, wherein,
Above-mentioned image color adjustment unit carries out above-mentioned table hand-off process in the moment that image formation number reaches the regulation number.
16. image processing system as claimed in claim 9, wherein,
Possess a plurality of above-mentioned developers;
Above-mentioned image color adjustment unit keeps above-mentioned a plurality of ink powder adhesion amounts-sensor output relation table and said reference fragment image color-toner particle diameter relation table corresponding to toner particle diameter at every kind of ink powder of this each developer;
Carry out above-mentioned table hand-off process in the above-mentioned predetermined moment at each developer;
In this each the above-mentioned toner particle diameter of table in the hand-off process differentiated, utilization is corresponding to the said reference fragment image color-toner particle diameter relation table of the ink powder of developer, and the switching of above-mentioned ink powder adhesion amount-sensor output relation table is selected to carry out from the above-mentioned a plurality of ink powder adhesion amounts-sensor output relation table corresponding to the ink powder of developer.
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