CN1324346C - Color image forming device - Google Patents
Color image forming device Download PDFInfo
- Publication number
- CN1324346C CN1324346C CNB2004101021497A CN200410102149A CN1324346C CN 1324346 C CN1324346 C CN 1324346C CN B2004101021497 A CNB2004101021497 A CN B2004101021497A CN 200410102149 A CN200410102149 A CN 200410102149A CN 1324346 C CN1324346 C CN 1324346C
- Authority
- CN
- China
- Prior art keywords
- revisal
- offset
- mentioned
- subscan
- carry out
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Color Electrophotography (AREA)
Abstract
The invention provides a color-image formation device capable of calculating a positional-deviation value in the main scanning direction without writing on a transfer belt the line for measuring the positional-deviation value in the main scanning direction and of correcting the positional deviation with improving the productivity of the color-image formation device by performing the resist-correction task in the main scanning direction from the calculated positional-deviation value. A light flux output from semiconductor lasers 10A to D is reflected by a polygon mirror 24 and passes through scanning lens 5A to D, then split into reflected light and transmitted light by half mirrors 16A to D. The transmitted light inputs to photosensitive bodies 5A to D, while the reflected light inputs to sensors (first sensors 15A1 to A4, second sensors 15C1 to C4 and third sensors 15B1 to B4). The positional-deviation value is calculated by converting the time, which is counted from the timing of sensing the light flux, reflected by the polygon mirror 24, by synchronous sensing plates 20A to D to the timing of sensing the light flux by each sensor, into a dot.
Description
Technical field
The present invention relates to coloured image and form device, in more detail, the coloured image that relates to the electrofax mode forms device, image forming part along the transfer belt plural number side by side, not homochromy toner image is superimposed, be formed on the transfer paper, when forming coloured image, can improve image and form efficient, and the suitably capable revisal of contraposition offset shift-in.
Background technology
Form in the device at coloured images such as for example digital color copy machines, each photoreceptor turns round separately, scanning optical apparatus is provided with some corresponding with above-mentioned photoreceptor respectively independent means that write that are provided with, by this scanning optical apparatus, with writing with variant color image corresponding scanning line, form electrostatic latent image respectively, by some video picture means with corresponding look (black, yellow, magenta, cyan) toner develops to above-mentioned each electrostatic latent image, on recording medium (transfer paper), obtains coloured image by the superimposed transfer printing of the toner image that this has been developed.This coloured image forms device and is called as the tandem type image processing system.Form the means of using in the device that write at this coloured image, penetrate to write from light sources such as for example semiconductor lasers and use light beam, by making above-mentioned light beam become sweep trace by writing the optical element that lens etc. constitute, by this sweep trace photoreceptor is scanned, on this photoreceptor, form the electrostatic latent image corresponding with image information.
Form in the device being provided with some tandem type coloured images that write means and video picture means, forming device with the coloured image that only is provided with a photoreceptor compares, the toner image of the superimposed different looks of order on the same one side of transfer paper, form coloured image, if toner image of all kinds is offset in the transferred image position of transfer paper, then be formed on coloured image tone generation difference or color shift on the transfer paper, deterioration of image quality.
In order to prevent the problems referred to above, open in 2003-5108 number (following brief note is " patent documentation 1 ") for example spy, the tandem type scanning optical apparatus is provided with some and black, yellow, magenta, the means that write of cyan correspondence and video picture means, image processing system is provided with above-mentioned scanning optical apparatus, in this communique, described owing to be located at the inhomogeneity of the optical element lenses inside in the means of writing, the deviation of components accuracy when the face shape is made, change of shape that causes because of temperature variation etc., different in beam spots footpath, each position of light beam main scanning direction, or optical characteristics difference such as light quantity, become and cause above-mentioned bad occurrence cause.
And, some places at main scanning direction, measure the optical characteristics of sweep trace, according to this measurement result, light source is penetrated light modulate, carry out the revisal of main sweep multiplying power, make each position at main scanning direction, big difference does not take place in optical characteristics, can prevent the color shift of coloured image, obtains good color tone.
In the spy opens 2001-228672 number (following brief note for " patent documentation 2 ") communique, the tandem type image processing system is provided with some formation picture position, be used to form black, yellow, magenta, each color image of cyan is in the transfer belt that is used to transport transfer paper, form some groups of sub scanning direction offsets and measure 4 (black of line of usefulness, yellow, magenta, cyan) and the main scanning direction offset measure 4 (black of line of usefulness, yellow, magenta, cyan), as the toner mark that is used to detect picture position of all kinds skew, measure offset of all kinds, according to this measurement result, carry out crooked revisal, the revisal of main sweep multiplying power, main sweep location revisal, the capable revisal of contraposition offset shift-in suitably.
At this, describe the offset correction method of record in the patent documentation 2 in detail.
Form in the device at the tandem type coloured image that is provided with some formation picture position, for example, Width both ends in the transfer belt that is used to transport transfer paper, be formed for detecting the toner mark (detection position pattern) of picture position of all kinds skew, detection means is located at the downstream of transfer belt, by light-emitting component, the clearance part that receives optical element and the formation transparency window consistent with above-mentioned toner mark shape constitutes, detect above-mentioned toner mark by this detection means, according to testing result, the detection position skew forms picture position skew the carrying out revisal of position to each image.
Above-mentioned toner mark generally is that formation is the parallel line of main scanning direction with the direction of scanning that light writes on transfer belt, and main scanning direction has for example lines of 45 degree of special angle relatively.Detection means is provided with the clearance part of the formation transparency window consistent with above-mentioned toner mark shape, and it is receiving between optical element and the transfer belt.Therefore, the reception optical element of detection means receives the light that sees through transparent transfer belt from light-emitting component, if the position consistency of toner mark and transparency window then receives the light that is hidden by the toner mark.Detection means detects the toner mark according to the difference that is subjected to the light light quantity that receives optical element and passes through the time, difference according to the time to peak of the line of the toner mark parallel with main scanning direction, detect the offset of sub scanning direction, the difference of time to peak that has the line of special angle according to relative main scanning direction detects the offset of main scanning direction.Coloured image forms the testing result of device according to this detection means, and position revisal (crooked revisal, the revisal of main sweep multiplying power, main sweep location revisal) is carried out in the calculating location skew.
But, in above-mentioned patent documentation 1,, only carry out the revisal of main sweep multiplying power as the position revisal, do not carry out main sweep location revisal.
In the offset correction method of above-mentioned patent documentation 2 records, on transfer belt, form 4 (black of line that usefulness is measured in some groups of sub scanning direction offsets, yellow, magenta, cyan) and the main scanning direction offset measure line 4 (black, yellow of usefulness, magenta, cyan), as the toner mark that is used to detect picture position of all kinds skew, measure offset of all kinds, according to this measurement result, carry out the position revisal.But in the method, the above-mentioned time that writes means formation toner mark, above-mentioned detection means reads the time of toner mark calculating location side-play amount, and the time of carrying out the offset revisal according to the position offset that calculating gets, must make common image form action stops, like this, the productivity of coloured image formation device is low.
Even when coloured image forms the initial setting of device, carry out the offset adjustment, also can be because of installing inner part replacement such as image-forming assembly, coloured image forms the maintenance of device, and coloured image forms occurrence positions such as the carrying skew of device.In addition, after forming many images, mechanism's temperature changes, and also can cause offset.Therefore, the offset revisal is carried out before being preferably in printing action beginning, still, if from after the print command to beginning to carry out the offset revisal during the printing, then need to change from after the print command to the time interval that begins to print, carry out revisal.And, in order to enhance productivity,, then can not form the line of sufficient amount, the precision of infringement offset revisal if should set in the time interval shortlyer.In order to obtain sufficient precision, if increase the line number, then from increasing the infringement productivity to the time that begins to print after the print command.
Summary of the invention
The present invention puts forward in view of above-mentioned existing in prior technology problem, first purpose of the present invention is, provide coloured image to form device, the main scanning direction offset need not be measured line 4 (black, yellow of usefulness, magenta, cyan) writes on the transfer belt, can calculate the position offset of main scanning direction, carry out the location revisal of main scanning direction according to this position offset, improve the productivity that coloured image forms device on the one hand, carry out the position revisal on the one hand.
Second purpose of the present invention is, provide coloured image to form device, temperature variation according to elapsed time behind the previous position offset compensation and device internal mechanism, carry out the offset revisal, judge whether the not location revisal of the main scanning direction of writing line, and the location revisal of the sub scanning direction of writing line, according to judged result, only carry out necessary revisal, improve the productivity that coloured image forms device on the one hand, carry out the position revisal on the one hand.
The 3rd purpose of the present invention is, provides coloured image to form device, also can improve the productivity that coloured image forms device when printing continuously on the one hand, carries out the position revisal on the one hand.
In order to realize above-mentioned first purpose, the present invention proposes following scheme:
(1) a kind of coloured image forms device, is tandem type, is provided with:
Deflector makes from the beam deflection of some light sources ejaculations;
Some scanning lenses make the above-mentioned some light beams that are deflected by deflector become sweep trace;
Some semi-transparent semi-reflecting lens make the above-mentioned some light beams that become sweep trace by scanning lens become through light and reflected light;
Some optical detection devices are used to detect and see through light or reflected light from semi-transparent semi-reflecting lens;
Some photoreceptors, make from semi-transparent semi-reflecting lens see through light or reflected light imaging, form sub-image;
Some developers to the above-mentioned image development that is formed on the photoreceptor, become toner image;
To be positioned on the recording medium of transporting on the transfer belt by multiple superimposed being printed on of the toner image that above-mentioned developer develops; It is characterized in that, be provided with:
Main sweep offset calculation element detects time of light beam according to above-mentioned some optical detection devices, calculates the position offset of main scanning direction;
Main sweep offset compensating device calculates the position offset of the main scanning direction that get according to above-mentioned main sweep offset calculation element, carries out main sweep and locatees revisal.
In order to realize above-mentioned second purpose, the present invention proposes following scheme:
(2) coloured image in above-mentioned (1) forms in the device, it is characterized in that, further is provided with:
Subscan offset calculation element, some lines of usefulness are measured in the offset that forms sub scanning direction on above-mentioned transfer belt, calculate the position offset of sub scanning direction;
Subscan offset compensating device calculates the position offset of the sub scanning direction that get according to above-mentioned subscan offset calculation element, carries out subscan and locatees revisal;
Judgment means judges whether to carry out main sweep location revisal with above-mentioned main sweep offset compensating device, and whether carries out subscan location revisal with above-mentioned subscan offset compensating device.
In order to realize above-mentioned the 3rd purpose, the present invention proposes following scheme:
(3) in the coloured image formation device of above-mentioned (2), when carrying out printing continuously, utilize to be positioned in and transport transporting at interval of next recording medium on the transfer belt, carry out main sweep location revisal with above-mentioned main sweep offset compensating device.
(4) in the coloured image formation device of above-mentioned (2) or (3), when carrying out printing continuously, utilize to be positioned in and transport transporting at interval of next recording medium on the transfer belt, carry out subscan location revisal with above-mentioned subscan offset compensating device.
(5) coloured image of any forms in the device in above-mentioned (2)-(4), when carrying out printing continuously, above-mentioned judgment means is according to remaining printing number, judge whether to carry out main sweep location revisal, and whether carry out subscan location revisal with above-mentioned subscan offset compensating device with above-mentioned main sweep offset compensating device.
The following describes effect of the present invention.
Coloured image according to the invention described above (1) scheme forms device, does not write main scanning direction offset mensuration 4 on line (black, yellow, magenta, cyan) on transfer belt 11, and can calculate the position offset of main scanning direction.And,, carry out main sweep location revisal according to the position offset that aforementioned calculation gets, compare with mode in the past, can save the offset mensuration that writes main scanning direction and use line, read the time of this line computation position offset, can shorten the offset revisal time.That is, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Coloured image according to the invention described above (2) scheme forms device, according to carried out the elapsed time after the offset revisal or the temperature variation of device internal mechanism from last time, judge whether the not location revisal of the main scanning direction of writing line, and the location revisal of the sub scanning direction of writing line resembling in the past, only carry out necessary revisal according to judged result, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Coloured image according to the invention described above (3) scheme forms device, when printing continuously, also can carry out the not location revisal of the main scanning direction of writing line, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Coloured image according to the invention described above (4) scheme forms device, when printing continuously, carry out the not location revisal of the main scanning direction of writing line, and the location revisal occasion of the sub scanning direction of writing line resembling in the past, can utilize each interval of transporting transfer paper, separately carry out the subscan location revisal of main sweep location revisal and toner of all kinds, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Coloured image according to the invention described above (5) scheme forms device, according to remaining printing number, whether decision carries out the offset revisal, the few occasion of remaining printing number, the printing action is preferential, after the printing release of remaining printing number part, carries out the offset revisal, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Description of drawings
Fig. 1 is that optical system that the coloured image that relates to of the embodiment of the invention forms the scanning optical apparatus that device is provided with is launched key diagram at grade;
The coloured image that Fig. 2 represents to be provided with the scanning optical apparatus of Fig. 1 forms the imaging portion pie graph of device;
Fig. 3 is the figure that is used to illustrate the synchronous detection Board position;
Fig. 4 represents the LD point modulating signal of synchronous detection signal and three sensor occasions;
Fig. 5 represents near the signal enlarged drawing of the 1st sensor;
Fig. 6 is a process flow diagram of carrying out coloured image formation device action one example of main sweep location revisal and subscan location revisal with time and temperature treatment decision;
Fig. 7 is the process flow diagram that the coloured image of separately carrying out main sweep location revisal and subscan location revisal during continuously by paper forms device action one example.
Embodiment
1-7 describes preferred embodiment of the present invention in detail with reference to the accompanying drawings.
Fig. 1 is that optical system that the coloured image that relates to of the embodiment of the invention forms the scanning optical apparatus that device is provided with is launched key diagram at grade, and the coloured image that Fig. 2 represents to be provided with the scanning optical apparatus of Fig. 1 forms the imaging portion pie graph of device.Coloured image that the embodiment of the invention relates to forms the scanning optical apparatus of putting down in writing in device and the patent documentation 1 and the image processing system that is provided with it has identical formation.
Scanning optical apparatus 1 shown in Figure 1 is the scanning optical apparatus of tandem type, and it is provided with deflector 4, scanning lens (f θ lens) 5A, 5B, 5C, 5D, some optical characteristics determinator 15A1～15A4,15B1～15B4,15C1～15C4.Above-mentioned deflector 4 is made of polygonal mirror motor 23 and polygonal mirror (pivoting part) 24, from becoming the semiconductor laser 10A of light source, and 10B, 10C, 10D penetrate laser respectively, form light beam, and above-mentioned deflector 4 makes this laser beam deflection.Some light beams of this deflection form sweep trace by image optics system respectively, and above-mentioned scanning lens 5A, 5B, 5C, 5D become scanning optical system.Above-mentioned some optical characteristics determinators detect each sweep trace respectively, are used to measure the optical characteristics of each sweep trace.By above-mentioned sweep trace, respectively conduct shown in Figure 2 is scanned the photoconductor drum 9A of body, 9B, 9C, 9D scans, and forms each image, can be printed on the recording medium (transfer paper) each image is multiple.
In the present embodiment, with each optical characteristics determinator 15A1～15A4,15B1～15B4,15C1～15C4 are used to detect injecting constantly of each light beam as optical detection device.As mentioned above, this scanning optical apparatus 1 constitutes three groups of optical characteristics determinators corresponding with each sweep trace.The first optical characteristics determinator comprises optical characteristics determinator 15A1,15A3, and 15A2,15A4 is used to detect the light beam that sets the position of the end periphery that writes the beginning side in the scanning area of each sweep trace; The second optical characteristics determinator comprises optical characteristics determinator 15B1,15B3, and 15B2,15B4 is used to detect the light beam that sets the position of the other end periphery in the scanning area of each sweep trace; Between the above-mentioned first optical characteristics determinator and the second optical characteristics determinator, dispose optical characteristics determinator 15C1 respectively in the roughly centre position of the direction of scanning of scanning area, 15C3,15C2,15C4 constitutes the 3rd optical characteristics determinator.
Scanning optical apparatus 1 is according to the detection signal of above-mentioned three optical characteristics determinators to each sweep trace, to respectively from four semiconductor laser 10A, 10B, 10C, the laser that 10D penetrates is modulated.In the present embodiment, the three optical characteristics determinator corresponding with each sweep trace is provided with one respectively, is that example is illustrated with this occasion, still, the 3rd optical characteristics determinator also relatively each sweep trace be provided with more than two or two.
In Fig. 1, from each scanning lens (f θ lens) 5A, 5B, 5C, 5D are to each optical characteristics determinator 15A1～15A4, and 15B1～15B4, the reflective mirror between 15C1～15C4 illustrate and omit (reflective mirror is with reference to Fig. 2).
Respectively from semiconductor laser 10A, 10B, 10C, the laser that 10D penetrates is divergent beams, by coupled lens 2A～2D above-mentioned divergent beams that are coupled.Cylindrical lens 3A～3D is an image optics system, and it only has power at sub scanning direction, by this cylindrical lens 3A～3D, near the reflection spot of polygonal mirror 24, as line as imaging.This line picture can be imaged on the position of how much departing from reflection spot.Light beam as shown in Figure 2, by scanning lens 5A, passes through reflective mirror 6A again by polygonal mirror 24 reflections, 7A, and the 8A reflection by semi-transparent semi-reflecting lens 16A, is imaged on the photoconductor drum 9A.Above-mentioned semi-transparent semi-reflecting lens 16A is made of the reflection part of the dustproof glass of holding concurrently, and has the function that sees through a part of light.By the light beam of scanning lens 5B, again by reflective mirror 6B, 7B, the 8B reflection, same, by the semi-transparent semi-reflecting lens 16B of dustproof glass that holds concurrently, be imaged on the photoconductor drum 9B.By the light beam of scanning lens 5C, again by reflective mirror 6C, 7C, the 8C reflection by the semi-transparent semi-reflecting lens 16C of dustproof glass that holds concurrently, is imaged on the photoconductor drum 9C.By the light beam of scanning lens 5D, again by reflective mirror 6D, 7D, the 8D reflection by the semi-transparent semi-reflecting lens 16D of dustproof glass that holds concurrently, is imaged on the photoconductor drum 9D.
By charging device (not diagram), make the surface of each photoconductor drum 9A～9D respectively with the current potential that sets.Therefore, the charged face of each photoconductor drum 9A～9D is exposed, forms the sub-image corresponding with (cyan, magenta, yellow, black) of all kinds, by with corresponding developing apparatus of all kinds (not diagram), making becomes toner image of all kinds by each image development.Recording medium (transfer paper) is attracted on the transfer belt 11, and left transports in Fig. 2, above-mentionedly is formed on the superimposed transfer printing of each toner image sequence on each photoconductor drum 9A～9D on this recording medium.
The above-mentioned scanning lens (f θ lens) of each light beam setting also can be set to plural number relatively.In addition, as shown in Figure 2, scanning lens 5A that also can above-below direction is approaching, 5C and scanning lens 5B, 5D is superimposed along the vertical direction, and is integrated respectively, as lens.
In the present embodiment, by being configured to bilevel polygonal mirror 24, as shown in Figure 1, and about sweep trace (light beam) is divided into each two, but also can increase the sweep trace sum, the perhaps number of scanning lines that separated of change.
As shown in Figure 2, this scanning optical apparatus 1 is at each reflective mirror 8A of scanning optical system, 8B, 8C, 8D is that scanning is as the photoconductor drum 9A that is scanned body, 9B with being subjected to each scanning optical, 9C, between the 9D, be respectively equipped with semi-transparent semi-reflecting lens 16A, 16B, 16C, 16D, the function that it has antireflection part light makes reflecting surface relative scanning line roughly 45 degree that for example tilt.And, as semi-transparent semi-reflecting lens, has the feasible character that incides the light beam part reflection on it, optical characteristics determinator 15C1 detects a part of light beam by above-mentioned semi-transparent semi-reflecting lens 16A reflection, optical characteristics determinator 15C2 detects a part of light beam by above-mentioned reflective mirror 16B reflection, optical characteristics determinator 15C3 detects a part of light beam by above-mentioned reflective mirror 16C reflection, and optical characteristics determinator 15C4 detects a part of light beam by above-mentioned reflective mirror 16D reflection.
See through each semi-transparent semi-reflecting lens 16A respectively, 16B, 16C, the light beam of 16D arrives photoconductor drum 9A, 9B, 9C, 9D respectively.Be positioned at each optical characteristics determinator 15A1 of main scanning direction both sides, 15B1,15A2,15B2,15A3,15B3,15A4,15B4 is writing extra-regional main scanning direction both sides, is fixed on the fixed part of device.At this, make semi-transparent semi-reflecting lens 16A, 16B, 16C, the light that sees through of 16D incides photoconductor drum 9A, 9B, 9C, 9D makes semi-transparent semi-reflecting lens 16A, 16B, 16C, the reflected light of 16D incide optical characteristics determinator 15A1,15B1,15C1,15A2,15B2,15C2,15A3,15B3,15C3,15A4,15B4,15C4 still, also can see through light and incide the optical characteristics determinator so that reflected light incides photoconductor drum.
Use the optical detection device during photodiode etc. for example can detect light beam incident, as each optical characteristics determinator 15A1,15B1,15C1,15A2,15B2,15C2,15A3,15B3,15C3,15A4,15B4,15C4.In addition, also can use beam diameter determinator or actinometry device as each optical characteristics determinator.When using the beam diameter determinator as each optical characteristics determinator occasion, the measurement result of the beam diameter of measuring according to each beam diameter determinator is adjusted the position of cylindrical lens, carries out revisal.When using the actinometry device as each optical characteristics determinator occasion, the actinometry result of the light beam of measuring according to the actinometry device adjusts the power of semiconductor laser, carries out revisal.Like this, use optical detection device, the beam diameter determinator, certain as each optical characteristics determinator, can carry out revisal in the actinometry device, also is difficult to take place color shift even the image that forms is a coloured image, can obtain the good high quality graphic of tone.
In the past, on transfer belt 11, formed 4 (black of line that usefulness is measured in some groups of sub scanning direction offsets, yellow, magenta, cyan) and the main scanning direction offset measure line 4 (black, yellow of usefulness, magenta, cyan), as the toner mark that is used to detect toner image offset of all kinds, measure position offset of all kinds, according to this measurement result, carry out main sweep location revisal and subscan location revisal.But in this previous methods, the writing position skew is measured with 4 (black of line, yellow, magenta, cyan), read this toner mark again, calculate position offset of all kinds, time-consuming, must make common image formation action stop during this period, like this, the productivity of coloured image formation device is low.
So the present invention proposes not write 4 on the line (black, yellow, magenta, cyan) that usefulness is measured in the main scanning direction offset on transfer belt 11, calculate the method for main scanning direction position offset.In the method, detect the time of light beam from the synchronous detection plate, (the 1st sensor is optical characteristics determinator 15A1～15A4 to each sensor, the 2nd sensor is optical characteristics determinator 15C1～15C4, the 3rd sensor is the time that optical characteristics determinator 15B1～15B4) detects light beam, by being converted into point (dot), calculating location side-play amount this period.At this, so-called synchronous detection plate is used to determine image beginning position, with reference to Fig. 3, by polygonal mirror 24 beam reflected through reflective mirror 19A, 19B, 19C, the 19D reflection, by synchronous detection plate 20A, 20B, 20C, 20D detects.Also reflective mirror 19A can be set, 19B, 19C, 19D is directly incident on synchronous detection plate 20A by polygonal mirror 24 beam reflected, 20B, 20C is on the 20D.
Fig. 4 represents that (the 1st sensor is optical characteristics determinator 15A1～15A4 for synchronous detection signal and three sensors, the 2nd sensor is optical characteristics determinator 15C1～15C4, the 3rd sensor is the occasion of optical characteristics determinator 15B1～15B4), semiconductor laser (brief note is " LD " among the figure) 10A, 10B, 10C, the some modulating signal of 10D.From semiconductor laser 10A, 10B, 10C, the 10D beginning of lighting a lamp, as the interval T0 of synchronous detection, with after this interval order as T1, T2 ..., Tm.
The semiconductor laser 10A in T0 interval, 10B, 10C, 10D lights a lamp the time, is benchmark with the synchronous detection signal, make separately the decision W1, W2 behind the W3 point, makes semiconductor laser 10A, 10B, 10C, 10D lights a lamp, so that make that (the 1st sensor is optical characteristics determinator 15A1～15A4 at each sensor, the 2nd sensor is optical characteristics determinator 15C1～15C4, before the 3rd sensor is the detection position of optical characteristics determinator 15B1～15B4), semiconductor laser 10A, 10B, 10C, 10D lights a lamp.With the semiconductor laser 10A of the interval T0 of initial synchronous detection signal, 10B, 10C, the time of lighting a lamp of 10D is benchmark, staggers with certain interval (k point), lights a lamp repeatedly for m time.For example, in Fig. 4 example,, become (W1+k) point at interval T1,, become (W1+2k) point at interval T2, other the 2nd sensors, the 3rd sensor and the like.
Each interval the 1st sensor is near signal enlarged drawing optical characteristics determinator 15A1～15A4 in Fig. 5 presentation graphs 4.About signalizing activity, (the 1st sensor is optical characteristics determinator 15A1～15A4 to each sensor, and the 2nd sensor is optical characteristics determinator 15C1～15C4, and the 3rd sensor is identical near the optical characteristics determinator 15B1～15B4).
In example shown in Figure 5, with semiconductor laser 10A, 10B, 10C, the 10D time of lighting a lamp is made as 10 points, and the change of the start time of lighting a lamp is made as k point=1 point at interval, as we know from the figure, and at interval T1, semiconductor laser 10A, 10B, 10C, interval relatively T0 of the time of lighting a lamp of 10D, 1 point that lags behind, at interval T2, semiconductor laser 10A, 10B, 10C, interval relatively T0 of the time of lighting a lamp of 10D, 2 points that lag behind, and the like, measure number of times and be made as m time. Semiconductor laser 10A, 10B, 10C, 10D lights a lamp the time, the reference position of the beginning of lighting a lamp, the change interval of the start time of lighting a lamp (the k point, but k is not limited to integer), measure number of times and can both freely change.
(interval that optical characteristics determinator 15A1～15A4) detects light beam at first is made as Tn1, and the interval that detects light beam at last is made as Tn2 with the 1st sensor.
Then, for the 1st sensor (optical characteristics determinator 15A1～15A4), calculating location side-play amount.
At this moment, if establish n3=(n1+n2)/2, then (position on the optical characteristics determinator 15A1～15A4) writes the point of ordering from the synchronous detection plate to Z1 at the 1st sensor.At this, the formula of asking for Z1 is as follows:
Z1=n3 * k+W1 (point)
Equally, (interval that optical characteristics determinator 15C1～15C4) detects light beam at first is made as Tn1 ' with the 2nd sensor, the interval that detects light beam at last is made as Tn2 ', with the 3rd sensor (interval that optical characteristics determinator 15Bl～15B4) detects light beam at first is made as Tn1 "; the interval that detects light beam at last is made as Tn2 ", then become:
n3’＝(n1’+n2’)/2
n3”＝(n1”+n2”)/2
Write on the 2nd sensor (point on the optical characteristics determinator 15C1～15C4) leave the synchronous detection plate apart from Z2, and write on the 3rd sensor (point on the optical characteristics determinator 15B1～15B4) leave the synchronous detection plate apart from Z3 to ask for formula as follows:
Z2=n3 ' * k+W2 (point)
Z3=n3 " * k+W3 (point)
If will be from synchronous detection plate to the 1 sensor (optical characteristics determinator 15A1～15A4), the 2nd sensor (optical characteristics determinator 15C1～15C4), (desirable the counting of optical characteristics determinator 15B1～15B4) is made as Y1 respectively to the 3rd sensor, Y2, Y3, the position offset Δ Z1 on each sensor then, Δ Z2, Δ Z3 is by trying to achieve with following formula:
Δ Z1=Z1-Y1 (point)
Δ Z2=Z2-Y2 (point)
Δ Z3=Z3-Y3 (point)
At this, ask for the position offset Δ Z1 on each sensor, Δ Z2, the maximum of Δ Z3 and the average delta Z of minimum:
ΔZ＝{max(ΔZ1，ΔZ2，ΔZ3)+min(ΔZ1，ΔZ2，ΔZ3)}/2
Aforementioned calculation is carried out (black, yellow, magenta, cyan) of all kinds, and Δ Z of all kinds uses following symbolic representation respectively:
The position offset of black: Δ Zbk
Yellow position offset: Δ Zy
The position offset of magenta: Δ Zm
The position offset of cyan: Δ Zc
Revisal amount of all kinds is asked in order to following formula respectively:
Sbk＝-ΔZbk
Sy＝-ΔZy
Sm＝-ΔZm
Sc＝-ΔZc
Then, according to the revisal amount Sbk that is tried to achieve, Sy, Sm, Sc, main sweep location revisal is carried out in the beginning position of decision image.
In the present embodiment, above-mentioned " point " calculated as 1 with one-period in the arteries and veins of semiconductor laser point modulating signal.Certainly, the present invention is not limited thereto, also can adopt the additive method enumeration.
Like this, measure 4 on the line (black, yellow, magenta, cyan) of usefulness without writing the main scanning direction offset on the transfer belt 11, and can calculate the position offset of main scanning direction.And,, carry out main sweep location revisal according to the position offset that aforementioned calculation gets, compare with mode in the past, the line that usefulness is measured in the offset that writes main scanning direction can be saved, the time of reading this line computation position offset, the offset revisal time can be shortened.That is, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Measure 4 (black of line of usefulness on transfer belt 11, not writing the main scanning direction offset above, yellow, magenta, cyan), calculate the position offset of main scanning direction, the method for carrying out main sweep location revisal is illustrated, but, usually, carry out main sweep location revisal simultaneously, also carrying out subscan location revisal.This subscan location revisal is carried out revisal by the writing line on transfer belt 11 of mode in the past.
Compare with carrying out revisal of main sweep location and subscan location revisal simultaneously, carry out separately more shortening the time.Below, main sweep location revisal and subscan location revisal occasion are carried out in explanation simultaneously respectively, and carry out main sweep location revisal occasion separately.
Change image-forming assembly, when the maintenance coloured image forms device, or form the big occasion of mechanism's temperature variation behind many images, carry out main sweep location revisal and subscan location revisal simultaneously.On the other hand, form the little occasion of mechanism's temperature variation behind many images, or adjusted short occasion of elapsed time after (the main sweep location revisal of last time) etc. from last time, and estimate the little occasion of error (offset) of sub scanning direction, only carry out main sweep location revisal.
At this, Fig. 6 is a process flow diagram of carrying out coloured image formation device action one example of main sweep location revisal and subscan location revisal with time and temperature treatment decision, in Fig. 6, from last time in the adjusted elapsed time was that n is more than second, and the following occasion of temperature variation Δ T is only carried out main sweep location revisal.About n second, the concrete numerical value of Δ T, the mechanism that forms device according to coloured image constitutes etc., according to the suitable setting of experimental result.
With reference to Fig. 6, the user forms device indication print command to coloured image, at step S101, judge from last time in the adjusted elapsed time whether be that n is more than second.That is, the moment that will carry out last time main sweep location revisal is stored in coloured image in advance and forms in the device, and whether the moment of judging this storage is that n is more than second with poor (elapsed time) of present moment.As if not passing through n more than second ("No" of step S101) from last time in the adjusted elapsed time, then enter step S102, main sweep location revisal and subscan location revisal are not carried out, and carry out printing and move.
If from adjusted elapsed time last time through above occasion n second ("Yes" of step S101), then enter step S103, judge from last time adjusted temperature variation whether be below the Δ T.That is, the temperature that writes assembly in the time of will carrying out the revisal of last time main sweep location is stored in coloured image in advance and forms in the device, judges whether the temperature of this storage and the present difference that writes assembly temperature are below the Δ T.At this, what is called write assembly be meant Fig. 2 remove photoreceptor 9A～9D, transfer belt 11, the part of roller 12a～12c adds semiconductor laser 10A, 10B, 10C, 10D writes at this that assembly is outside installs a pair of thermal conductor, can detected temperatures.
At this, if from last time adjusted temperature variation be the following occasion of Δ T ("Yes" of step S103), then enter step S106, only carry out the revisal of main sweep location, then, enter step S102, carry out the printing action.On the other hand, if from last time adjusted temperature variation than the big occasion of Δ T ("No" of step S103), then enter step S104, carry out main sweep location revisal, then, enter step S105, carry out subscan location revisal, enter step S102 again, carry out the printing action.At step S104, the method that main sweep that S106 carries out location revisal is carried out revisal for writing line not, the subscan location revisal of carrying out at step S105 is the method that writing line carries out revisal of passing through in the past.
If handling procedure according to Fig. 6 flow process, the method that the offset revisal of main scanning direction adopts writing line calculating location side-play amount not to carry out revisal, compare with previous methods, can save the offset mensuration line that writes main scanning direction, read the time of this line computation position offset, can shorten the offset revisal time.That is, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Print occasion continuously, make the transfer paper that forms image pass through continuously, more than ground orders of this transfer paper transport out from paper feeding cassette, and each transfer paper transports certain interval.In the past,, ended printing for the moment, carried out the offset revisal when judgement needs offset revisal occasion.If utilize above-mentioned paper to transport at interval, change this interval as required, carry out the offset revisal, then there is no need to end printing.
About the offset revisal, main sweep location revisal and subscan location revisal are arranged, can cut apart above-mentioned revisal action, effectively utilize above-mentioned paper and transport at interval.
Fig. 7 is cut apart the process flow diagram that the coloured image of carrying out main sweep location revisal and subscan location revisal forms device action one example during continuously by paper.
With reference to Fig. 7, the user forms device indication print command to coloured image, at step S201, carries out part printing action, then, enters step S202, judges whether to satisfy regularization condition.At this, about regularization condition, can be suitable for the condition of carrying out revisal of main sweep location and subscan location revisal of Fig. 6 flowchart text, promptly " from last time in the adjusted elapsed time through n more than second, and temperature variation is bigger than Δ T ".
Do not satisfy regularization condition occasion ("No" of step S202), then enter step S211, judge whether remaining printing number, remaining printing number occasion ("Yes" of step S211), then return step S201, from the processing of step S201, there is not remaining printing number occasion ("No" of step S211), then end process repeatedly.
Satisfy regularization condition occasion ("Yes" of step S202), then enter step S203, judge remaining printing number whether more than three and three, three occasions of remaining printing number less than ("No" of step S203) then enter step S211, judge whether remaining printing number, remaining printing number occasion ("Yes" of step S211) is then returned step S201, repeatedly from the processing of step S201, there is not remaining printing number occasion ("No" of step S211), then end process.Three occasions of remaining printing number less than ("No" of step S203) can not carried out main sweep location revisal and subscan location revisal regardless of regularization condition, in the printing action that step S201 prints remaining printing number, end process yet.
Three and three above occasions of remaining printing number ("Yes" of step S203) then enter step S204, carry out main sweep location revisal.Then,, carry out part printing action,, carry out yellow subscan location revisal at step S206 at step S205.At step S207, carry out part printing action, at step S208, carry out the subscan location revisal of magenta.At step S209, carry out part printing action, at step S210, carry out the subscan location revisal of cyan.Then, enter step S211, judge whether remaining printing number, remaining printing number occasion ("Yes" of step S211) is then returned step S201, repeatedly from the processing of step S201, there is not remaining printing number occasion ("No" of step S211), then end process.The method that the main sweep location revisal of carrying out at step S204 is carried out revisal for writing line not, at step S206, S208, the subscan location revisal of the toner of all kinds that S210 carries out is the method that writing line carries out revisal of passing through in the past.
If handling procedure according to Fig. 7 flow process, the method that the offset revisal of main scanning direction adopts writing line calculating location side-play amount not to carry out revisal, compare with previous methods, can save the offset mensuration line that writes main scanning direction, read the time of this line computation position offset, can shorten the offset revisal time.
The offset revisal of sub scanning direction, at each interval of transporting transfer paper, carry out the subscan location revisal of toner of all kinds, separately write by the line of the offset of sub scanning direction being measured usefulness, the change amount at above-mentioned interval is smaller, can shorten the offset revisal time.That is, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Offset changes substantially and changes continuously, even reach the regularization condition occasion that needs main sweep location revisal and subscan location revisal, when after this first transfer paper formed image, it is little that the big possibility that changes takes place the side-play amount of offset.
So, also can reach regularization condition constantly, remaining printing number is opened following occasion for certain certain number N, do not carry out offset revisal (main sweep location revisal and subscan location revisal) in this moment, printing action remaining printing number part is all over constantly, carries out offset revisal (main sweep location revisal and subscan location revisal).The concrete numerical value that this N opens forms the machinery formation of device etc. according to coloured image, carry out suitable setting according to experiment value.
Like this, even reach regularization condition, according to remaining printing number decision whether carrying out offset revisal, the few occasion of remaining printing number, the printing action is preferential, after the printing release of remaining printing number part, carries out the offset revisal, can carry out the offset revisal in that coloured image is formed under the low state of productivity of device.
Above with reference to description of drawings embodiments of the invention, but the present invention is not limited to the foregoing description.Can do all changes in the technology of the present invention thought range, they all belong to protection scope of the present invention.
For example, in the present invention, detect time of light beam from the synchronous detection plate, the time to each sensor to light beam is by will being converted into some the calculating location side-play amount this period.But the present invention is not limited to the foregoing description, and being converted into a little only is a kind of means of calculating location side-play amount, also can pass through additive method calculating location side-play amount.
Claims (6)
1. a coloured image forms device, is tandem type, is provided with:
Deflector makes from the beam deflection of some light sources ejaculations;
Some scanning lenses make the above-mentioned some light beams that are deflected by deflector become sweep trace;
Some semi-transparent semi-reflecting lens make the above-mentioned some light beams that become sweep trace by scanning lens become through light and reflected light;
Some optical detection devices are used to detect and see through light or reflected light from semi-transparent semi-reflecting lens;
Some photoreceptors, make from semi-transparent semi-reflecting lens see through light or reflected light imaging, form sub-image;
Some developers to the above-mentioned image development that is formed on the photoreceptor, become toner image;
To be positioned on the recording medium of transporting on the transfer belt by multiple superimposed being printed on of the toner image that above-mentioned developer develops; It is characterized in that, be provided with:
Main sweep offset calculation element detects time of light beam according to above-mentioned some optical detection devices, calculates the position offset of main scanning direction;
Main sweep offset compensating device calculates the position offset of the main scanning direction that get according to above-mentioned main sweep offset calculation element, carries out main sweep and locatees revisal.
2, form device according to the coloured image described in the claim 1, it is characterized in that, further be provided with:
Subscan offset calculation element, some lines of usefulness are measured in the offset that forms sub scanning direction on above-mentioned transfer belt, calculate the position offset of sub scanning direction;
Subscan offset compensating device calculates the position offset of the sub scanning direction that get according to above-mentioned subscan offset calculation element, carries out subscan and locatees revisal;
Judgment means judges whether to carry out main sweep location revisal with above-mentioned main sweep offset compensating device, and whether carries out subscan location revisal with above-mentioned subscan offset compensating device.
3. according to the formation of the coloured image described in the claim 2 device, it is characterized in that, when carrying out printing continuously, utilize to be positioned in and transport transporting at interval of next recording medium on the transfer belt, carry out main sweep location revisal with above-mentioned main sweep offset compensating device.
4. form device according to the coloured image described in claim 2 or 3, it is characterized in that, when carrying out printing continuously, utilize to be positioned in and transport transporting at interval of next recording medium on the transfer belt, carry out subscan location revisal with above-mentioned subscan offset compensating device.
5. form device according to the coloured image described in claim 2 or 3, it is characterized in that, when carrying out printing continuously, above-mentioned judgment means is according to remaining printing number, judge whether to carry out main sweep location revisal, and whether carry out subscan location revisal with above-mentioned subscan offset compensating device with above-mentioned main sweep offset compensating device.
6. form device according to the coloured image described in the claim 4, it is characterized in that, when carrying out printing continuously, above-mentioned judgment means is according to remaining printing number, judge whether to carry out main sweep location revisal, and whether carry out subscan location revisal with above-mentioned subscan offset compensating device with above-mentioned main sweep offset compensating device.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP422994/2003 | 2003-12-19 | ||
| JP2003422994 | 2003-12-19 | ||
| JP422994/03 | 2003-12-19 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1629676A CN1629676A (en) | 2005-06-22 |
| CN1324346C true CN1324346C (en) | 2007-07-04 |
Family
ID=34857501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004101021497A Expired - Fee Related CN1324346C (en) | 2003-12-19 | 2004-12-20 | Color image forming device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1324346C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4675709B2 (en) * | 2005-08-03 | 2011-04-27 | 株式会社リコー | Optical scanning apparatus and image forming apparatus |
| JP4723955B2 (en) * | 2005-08-31 | 2011-07-13 | 株式会社リコー | Image forming apparatus |
| JP4238866B2 (en) | 2005-11-28 | 2009-03-18 | コニカミノルタビジネステクノロジーズ株式会社 | Image forming apparatus |
| CN102082956A (en) * | 2010-12-28 | 2011-06-01 | 天津大学 | Method for enhancing sensitivity of image sensor |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4962312A (en) * | 1988-09-20 | 1990-10-09 | Minolta Camera Kabushiki Kaisha | Laser beam scanning device with plural sources and source-sensitive synchronization |
| US5291223A (en) * | 1991-09-19 | 1994-03-01 | Konica Corporation | Exposure unit for a multicolor image forming apparatus capable of better registration of the multicolor images |
| CN1206855A (en) * | 1997-07-25 | 1999-02-03 | 株式会社东芝 | Multiple light beam optical device and image formation device equiped with same |
| JP2001228672A (en) * | 2000-02-16 | 2001-08-24 | Ricoh Co Ltd | Image forming device |
| US20020195552A1 (en) * | 2001-06-25 | 2002-12-26 | Takeshi Ueda | Scanning type optical device and image formation apparatus |
-
2004
- 2004-12-20 CN CNB2004101021497A patent/CN1324346C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4962312A (en) * | 1988-09-20 | 1990-10-09 | Minolta Camera Kabushiki Kaisha | Laser beam scanning device with plural sources and source-sensitive synchronization |
| US5291223A (en) * | 1991-09-19 | 1994-03-01 | Konica Corporation | Exposure unit for a multicolor image forming apparatus capable of better registration of the multicolor images |
| CN1206855A (en) * | 1997-07-25 | 1999-02-03 | 株式会社东芝 | Multiple light beam optical device and image formation device equiped with same |
| JP2001228672A (en) * | 2000-02-16 | 2001-08-24 | Ricoh Co Ltd | Image forming device |
| US20020195552A1 (en) * | 2001-06-25 | 2002-12-26 | Takeshi Ueda | Scanning type optical device and image formation apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1629676A (en) | 2005-06-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101080415B1 (en) | Light scanning unit and electrophotographic image forming apparatus adopting the same | |
| JP6524731B2 (en) | Image forming apparatus and image forming method | |
| JP5103644B2 (en) | Optical scanning apparatus, latent image forming apparatus, and image forming apparatus | |
| JP2017026714A (en) | Image formation device and image formation method | |
| JP2007133238A (en) | Image forming apparatus and color shift correction method | |
| CN1912761A (en) | Image forming apparatus | |
| US8929783B2 (en) | Image forming apparatus, method for performing image correction using the same and computer readable storage medium | |
| US10915994B2 (en) | Image forming apparatus | |
| JP5772335B2 (en) | Image forming apparatus, method and program, and computer-readable storage medium | |
| JP2004109658A (en) | Optical scanner and optical path adjusting method, and image forming apparatus | |
| CN1324346C (en) | Color image forming device | |
| KR101302591B1 (en) | Optical scanner and image forming apparatus | |
| CN101030059A (en) | Image forming apparatus | |
| JP2008170640A (en) | Image forming apparatus and laser light-amount controller | |
| JP2013223955A (en) | Image forming apparatus, and test image forming method | |
| JP2009069270A (en) | Optical scanner and image forming apparatus | |
| US6195108B1 (en) | Image formation method for forming electrostatic latent image on photosensitive belt with laser beam and image formation apparatus of the same | |
| JP2004009328A (en) | Image forming device | |
| JP2008076422A (en) | Image forming apparatus, control method, and program | |
| JP2008012806A (en) | Apparatus and method for forming image | |
| JP2008068509A (en) | Image forming device and luminous energy control method | |
| JP3448428B2 (en) | Image forming device | |
| JP2003121775A (en) | Light beam scanner | |
| JP4893009B2 (en) | Image forming apparatus, photoconductor, and misregistration detection method | |
| JP4692575B2 (en) | Background removal apparatus, program, and image forming apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20070704 Termination date: 20141220 |
|
| EXPY | Termination of patent right or utility model |