WO1999036834A9 - Einrichtung und verfahren zum drucken oder kopieren, wobei eine tonermarke an mindestens zwei messorten abgetastet wird - Google Patents
Einrichtung und verfahren zum drucken oder kopieren, wobei eine tonermarke an mindestens zwei messorten abgetastet wirdInfo
- Publication number
- WO1999036834A9 WO1999036834A9 PCT/EP1999/000211 EP9900211W WO9936834A9 WO 1999036834 A9 WO1999036834 A9 WO 1999036834A9 EP 9900211 W EP9900211 W EP 9900211W WO 9936834 A9 WO9936834 A9 WO 9936834A9
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- toner
- mark
- flt
- carrier
- sensor
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
- G03G15/0849—Detection or control means for the developer concentration
- G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
- G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
- G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/00025—Machine control, e.g. regulating different parts of the machine
- G03G2215/00029—Image density detection
- G03G2215/00033—Image density detection on recording member
- G03G2215/00037—Toner image detection
- G03G2215/00042—Optical detection
Definitions
- the invention relates to a device for printing or copying, wherein on a toner carrier at least one toner mark ⁇ for checking and adjusting the toner surface coverage is inked with toner.
- the invention further relates to a method for printing or copying.
- a conventional printer or copier has a toner carrier, for example a photoconductor; on which a latent image is generated, for example by exposure.
- a developer station is used to color the latent image with toner.
- This developer station contains a developer mixture of toner and carrier, for example magnetic iron particles, with an adjustable proportion of toner.
- a toner mark is colored with toner on the toner carrier and this toner mark is scanned, for example with the aid of a reflex sensor.
- the toner area coverage in such a two-component development system is essentially determined by the following factors, namely
- the factors c to f re ⁇ tively constant device parameters are the factors c to f re ⁇ tively constant device parameters.
- the factors a and b there is a mutual dependency; the toner supply in the developer zone is namely dependent on the toner concentration, so that the degree of coloring of the latent image is determined by the toner concentration.
- This ⁇ A degree of coloration or the toner surface coverage is proportional to toner concentration.
- the toner area coverage is set by measuring the toner mark, for example with the aid of a reflex sensor.
- the signal of the reflex sensor then serves as a measure of the area coverage, ie the darker the coloring of the toner mark with toner, the lower the signal level of the voltage of the receiver which detects the reflected radiation.
- this signal level is also dependent on the reflection behavior of the toner and the surface of the toner carrier, for example the surface of the photoconductor.
- the tolerances of the reflex sensor that scans the toner mark must also be observed. It is therefore state of the art to make an individual setting for the toner material, the developer station, the toner carrier, etc. for each printer.
- an image recording apparatus be ⁇ is known in which a toner density sensor abtestet two toner markings on a photoconductor drum.
- the sensor contains two photo receivers that evaluate the reflectance of the two toner marks.
- the toner marks are arranged transversely to the direction of movement of the photoconductor drum, one toner mark having a high toner density and the other toner mark having a low toner density.
- a pre-tension is set for the developer unit.
- the invention takes advantage of an effect which occurs when a full area is colored in the direction of movement of the toner carrier in the case of two-component developer mixtures.
- the toner supply within the developer zone changes.
- the toner supply is initially large, which leads to a high area coverage.
- new toner must first be conveyed through the developer rollers, which increases with a low toner concentration leads to a decrease in area coverage.
- the toner supply remain constant and thus also set a constanteriechendeckung.
- the colored toner mark as seen in the direction of movement of the toner carrier, is scanned by at least one sensor at at least two successive measuring locations, and the respective area coverage at these measuring locations is represented as electrical signals.
- the proportion of toner in the developer mixture is set. It is not the absolute level of the sensor signal that is evaluated, but rather the difference in the signals measured along the toner mark or the quotient of the signals. This difference or the quotient is largely independent of the reflectivity of the toner used, so that no different settings have to be made for different types of toner.
- the reflectivity of the surface of the toner carrier is only negligible in the result, in particular especially when, as explained in more detail below, a measurement is made of the reflection behavior of the respective surface.
- An exemplary embodiment is characterized in that the difference or quotient from the signals at the two measuring locations is compared with a desired value, and that a controller controls a conveying device depending on the comparison, which conveys toner to the developer station.
- a control system is created which ensures that the printer is always kept in an optimal operating state with a high-quality printing result.
- a value close to zero when evaluating the difference and a value close to one when evaluating the quotient is selected as the target value. If the control process with a certain undertone, i.e.
- a timing controller is preferably used as the controller, which switches the conveying device back and forth between an OFF state and an ON state.
- a reference-fixed scanning sensor which is preferably the same sensor that scans the toner mark at the two measuring locations, determines the reference time at which a reference point on the toner mark passes the scanning sensor.
- the leading edge or the trailing edge of the toner mark is preferably used as the reference point.
- the further points in time at which the two measuring locations are to be scanned can be determined. These measuring locations are then scanned for each toner mark with respect to the reference point at defined distances from this reference point.
- the described part of the invention is preferably used when the electrical signals are evaluated in accordance with the previously described device and the method. However, it can also be used advantageously to determine the position of a toner mark to be scanned at two measuring locations.
- FIG. 1 shows the toner mark with two measuring locations and the course of a sensor voltage over the length of the toner mark
- FIG. 2 shows a characteristic field of the toner supply over the length of a full surface in the counter-development principle
- FIG. 3 shows a characteristic field according to FIG. 2 for a synchronous development principle
- FIG. 4 shows a characteristic field according to FIG. 2 for a principle of counter-clockwise development
- FIG. 5 shows the relationship between area coverage and toner supply in the development zone
- FIG. 6 shows the area coverage over the length of a full area with different toner concentrations
- FIG. 7 shows the relationship of the area coverage over the length of a toner mark for different toner concentrations
- FIG. 8 shows the voltage emitted by a reflex sensor via the toner concentration for a black and a red toner
- FIG. 9 shows the reflectivity for different toner colors and the degree of area coverage for these different toner colors when regulating the toner concentration
- FIG. 10 schematically shows the construction of a printing device in which the invention is implemented
- FIG. 11 raster points in time at which the course of the sensor voltage is scanned and stored over the length of the toner mark
- Fig. 1 shows a rectangular toner mark 10 whose longitudinal ⁇ stretch in the direction of movement of a photoconductor drum is located.
- the toner mark 10 provided with toner is scanned at two measuring locations a1, a2. Due to the longitudinal movement of the photoconductor drum, the area of measurement a1, a2 in the case of a circular beam spot is extended in the manner of a slot.
- the measurement location a1 lies approximately in the middle of the first third and the measurement location a2 lies approximately in the middle of the last third of the toner mark 10.
- FIG. 1 on the right the course of the voltage U of a radiation receiver over the length L of the toner mark 10 is shown in a diagram.
- the radiation receiver (not shown) detects the radiation reflected by the toner mark 10 and the surface of the photoconductor drum (also not shown) and, if necessary, converts it into a voltage U after amplification.
- a first section 12 of the course of the curve radiation from the reflection sensor is reflected by the bare photoconductor surface with a high reflectivity, and a maximum voltage level Um results, which is used as a reference level.
- the radiation sensor detects the front edge 10a of the toner mark 10, the reflected radiation and thus also the voltage U decreasing.
- section 14 there is a minimum of the voltage curve if the beam spot lies completely within the toner mark 10 after passing the front edge 10a.
- section 16 which is characterized by detecting the measuring location al. The voltage curve increases slightly in this area. The reason for this is explained below.
- the measurement spot detects the rear edge 10b.
- the voltage U rises again until it has reached the maximum value Um again in section 24.
- the difference value ⁇ U shown in the figure is evaluated.
- the mean voltage values U are preferably taken into account in the measurement locations a1 and a2.
- FIG. 2 shows on the basis of a diagram that the toner supply TA decreases over the length of a full surface, such as the toner mark 10, in the counter-development principle.
- the photoconductor drum FLT and developer roller EW have opposite directions of rotation, as is shown schematically in FIG. 2 below.
- the toner mark 10 reaches the developer roller EW with its front edge 10a, many toner particles are available for transfer to the photoconductor drum FLT for the first time, so there is a high toner supply TA.
- the toner supply TA becomes depleted, and only as many toner particles are transferred as are conveyed to the developer roller EW by the developer station.
- the toner supply TA There is a drop in the toner supply TA, as is expressed by the three characteristic curves which relate to a high toner concentration TK, a medium toner concentration TK and a low toner concentration TK.
- a measuring location for example measuring location al, must be arranged. After a certain length, the amount of toner replenished is constant - the characteristic curves run approximately parallel to a saturation characteristic curve 26, shown in broken lines, in which the toner mark 10 is colored 100% is done, ie even with an increase in the toner particles per unit area, there is no additional blackening during printing with a black toner.
- the measuring location a2 is to be arranged in this area of the largely parallel characteristic curves.
- the difference in the reflection behavior at the two measuring locations al and a2 is then correspondingly larger and, accordingly, the difference voltage ⁇ U is correspondingly larger.
- FIG. 3 shows a characteristic field similar to FIG. 2, but for a synchronous development principle in which the directions of rotation of the photoconductor drum FLT and developer roller EW are in the same direction. Due to the rotation in the same direction, there is an increased toner supply at the rear edge 10b of the toner mark 10, since the developer roller EW rotates at a higher speed than the photoconductor drum FLT.
- the measuring locations a1, a2 are to be arranged once in the straight line part of the curve and once in the relatively steeply falling part of the line of the curve.
- FIG. 4 relates to characteristic curves of the toner supply TA over the length of the toner mark 10 in the case of a countercurrent development principle, in which two developer rollers EW are moved in opposite directions to one another.
- the measuring spot al or al ' is to be arranged in the falling region of these characteristic curves, and the measuring location a2 in the straight-line region.
- FIG. 5 shows the relationship between area coverage FD on a full area, such as a toner mark 10, and the toner supply TA in the developer zone.
- the area coverage FD is also low. This area coverage increases up to 100% when the toner supply increases.
- An area coverage of 100% means that the toner mark 10 is completely covered with toner, and no defect is present, which allows shining through the surface of the photo conductor drum ⁇ .
- demzu ⁇ follow the blackening is no longer increasing in printing.
- a curve profile according to curve 28 is ascertained for many printers, the area coverage FD again decreasing. This may be due to clumping and irregularities in the toner layer structure, so that layers are created which cancel out the entire area coverage.
- FIG. 6 shows the arrangement of the measurement locations a1 and a2 in the counter-development principle.
- one measuring location a1 must be arranged in the area of the falling characteristic, while the other measuring location a2 is to be arranged in the rectilinear area of the characteristic.
- the characteristic curve 30 shows intersection points with characteristic curves of different toner concentration TK, the associated lengths L of which define the measuring locations for a2.
- the measurement location a2 is set to the right of curve 30 with a relatively long length L.
- FIG. 7 uses a practical example to show the relationship between the toner supply TA and the area coverage FD over the length L at different toner concentrations TK, whereby the lowest characteristic curve 34 has a low toner concentration.
- the characteristic curves 36, 38, 40, 42 show increasing toner concentrations TK, the characteristic curve 42 relating to a very high toner concentration TK, for example of 7 percent by weight and more.
- the toner mark 10 has a typical length 1 of 8 to 16 mm and a width b of 4 to 10 mm. There are differences ⁇ TA in the toner supply at the measuring locations a1 and a2, which decrease with increasing toner concentration TK.
- FIG. 8 shows the relationship between the voltage U measured by the radiation receiver at the various measuring locations a1, a2 for a black toner with low reflectivity and a red toner with relatively high reflectivity via the toner concentration TK, which is plotted in percent by weight.
- the maximum voltage Um is obtained when the voltage receiver measures the radiation reflected from the bare surface of the photoconductor drum.
- the characteristic curves for the red toner and the black toner show the voltage values as measured at the measuring locations a1 and a2.
- the vertical dashed area corresponds to the respective voltage difference ⁇ U. It depends on the reflectivity of the respective toner.
- the relationship for ⁇ U is shown at the top right of the diagram, where R-. the reflectivity of the respective toner, FLT the reflectivity of the surface of the photoconductor drum and K a device-side constant for a predetermined area coverage, e.g. is close to 100%.
- the reflection ratio R T / R FLT can be determined for each toner color and for each photoconductor drum and can then be taken into account in an evaluation, for example in the form of a correction table.
- the respective voltage difference ⁇ U can then be corrected to take into account different toner types.
- the quotient from R T / R FLT is very small because the reflectivity negligible compared to the reflectivity of the surface of the photoconductor drum.
- the value R ⁇ / Rp L ⁇ is approximately 1/300 for black toner and l / ⁇ _n for highly reflective toner, such as yellow or red toner.
- the error resulting from the different reflectivities of different toner colors is therefore relatively small.
- FIG. 9 shows a comparison of the reflectivity of different types of toner, as it expresses the characteristic curve 46, an area coverage FD of close to 100% being assumed.
- the diagram below in FIG. 9 shows the result of a regulation taking into account the voltage difference ⁇ U. A value is specified as the setpoint, at which the area coverage FD should be close to 100%. Regardless of the absolute reflectivity and the absolute values of the voltage U generated by the radiation sensor, a relatively constant value of the area coverage FD results for toners of different colors.
- the characteristic of the toner concentration TK fluctuates for the different toner colors.
- FIG 10 shows the schematic structure of a printing device in which the invention is implemented.
- a photoconductor drum FLT rotates during the printing process in the direction of the arrow P1, a toner image being printed on single sheets 50.
- a developer station 52 contains a container 54 in which the developer mixture of toner and carrier is processed.
- a developer roller 56 transfers the toner onto the surface of the photoconductor drum FLT.
- the photoconductor drum ⁇ FLT and the developer station 52 work according to the counter-rotation developing principle, that is, the directions of rotation of the developing roller 56 and the photoconductor drum FLT Einan ⁇ are opposite.
- the developer station 52 also includes a toner conveying device 58, which supplies toner to a toner cross feed 60 in a metered manner from a storage container. This cross-toner feed 60 delivers the toner to the container 54.
- the toner conveying device 58 contains a drive motor which is switched ON or OFF by a two-point controller 62.
- a toner mark 10 is provided on the photoconductor drum FLT and is scanned with the aid of a reflex sensor 64.
- This reflex sensor 64 contains an LED 66 which emits monochromatic infrared radiation.
- the use of infrared radiation has the advantage that this radiation reacts less sensitively to the different toner colors, so that their reflectivity is less important in the result.
- white interference light can be suppressed better by using infrared radiation.
- the LED 66 is supplied with the current I L from a controllable current source 68.
- a glass cover 72 is arranged between the photoconductor drum FLT and the reflex sensor 64, which prevents contamination by toner particles.
- the emitted beam 74 is reflected differently.
- the reflected radiation is composed of a portion 76 that originates from the surface of the photoconductor drum FLT.
- a further radiation component 78 results due to the reflection on the glass cover 72.
- the radiation reflected overall by the toner mark 10 is detected by a receiving device 82 which contains a receiving diode.
- the value ⁇ U is compared with a setpoint Us on the controller 62. If ⁇ U is greater than Us, the toner conveying device 58 is switched to the ON state and toner is fed in until the deviation between ⁇ U and Us is regulated to approximately zero.
- the switch 84 is switched in the direction of the arrow 86, as a result of which the controllable current source 68 is controlled via the controller 62.
- the reflectivity of the bare surface of the FLT photoconductor drum is normalized.
- the bare surface of the photoconductor drum FLT is illuminated by the reflex sensor 64 and the associated voltage value U is measured in the receiving device 82.
- the controllable current source 68 is now set such that a constant maximum value Um is set in the receiving device 82. With this setting, the toner mark 10 is then scanned later. This procedure ensures that the reflectivity of the surface of the photoconductor drum is less important in the result, because the different reflection behavior is normalized to the value Um.
- the values .DELTA.U of different photoconductor drums are thus largely constant with otherwise the same toner scanning.
- the adjustment phase described can also be repeated at intervals in order to correct a change in the reflectivity of the surface of the photoconductor drum FLT.
- a character generator (not shown) arranged in front of the developer station 52 transversely to the direction of rotation Pl of the photoconductor drum FLT writes the latent image or the latent images for a toner mark 10 or more toner marks onto the surface of the photoconductor drum FLT.
- the row gen rator and also the reflex sensor 64 are generally releasably installed, with installation tolerances. These can add up so that the distance along the circumference of the photoconductor drum FLT between the character generator and the reflex sensor 64 typically fluctuates up to 2 mm.
- a time control is usually used to scan the toner marks 10. When the latent image is started to be written by the character generator, a start time is defined. Because of the constant rotational speed of the photoconductor drum FLT and the known distance between the line generator and the reflex sensor 64, a delay time tm is determined, from which the scanning time for the toner mark 10 results from the reflex sensor 64.
- FIG. 11 shows the voltage curve U as the toner mark 10 passes the reflex sensor 64.
- the curve corresponds to that of FIG. 1.
- the scanning of the toner mark 10 takes place within a time frame ZR at times T1 to T16.
- four samples are obtained, which are fed as digital values to a computer control.
- the mean value of the 16 sample values determined at each time T1 to T16 is then used as the average sample value.
- the average samples are temporarily stored in a memory.
- the time frame ZR begins at the raster point in time Tl after the delay time tm has elapsed.
- averaged samples at times T4 to T7 and T10 to T13 are obtained as measured values from which the difference or quotient is then determined.
- the averaged samples at times T4 to T7 and T10 to T13 are again averaged in order to filter out the significant interference component in the signals by averaging.
- the values obtained in this way for the measurement locations a1 and a2 are then processed further.
- the front edge 10a or the rear edge 10b of the toner mark 10 is used as a reference point for recognizing the position of the toner mark 10.
- Uref is the voltage upon reflection of the radiation on the bare photoconductor drum FLT and Utm is the voltage upon reflection at the toner mark 10 at times T10 to T13.
- the time frame ZR is shifted with respect to the delay time tm and the voltage U is sampled in each case at the time T1.
- This shifting is carried out iteratively for each toner mark by a time interval between the times T1 and T2.
- the number of shifting steps required to determine the voltage Uh then indicates by how much the delay time tm has to be corrected in order to scan the toner mark 10 at the measuring locations a1, a2, the position of which is a defined distance from the leading edge 10a or have to the rear edge 10b of the toner mark 10.
- the sampling at time Tl is chosen because later times can vary in time due to interrupt run times of the interrupt-controlled generation of times Tl to T16. It should also be pointed out here that the voltage curve U is shown in a vertically compressed state in FIG. 11; the voltage Uref is much higher with respect to the voltage Utm than shown in the course.
- FIG. 12 shows the state by which the time frame ZR has been shifted so far until the voltage Uh has been determined until the time Tl.
- the number of times to find the voltage Uh The necessary shift clocks is a measure of how much the delay time tm has to be corrected in order to scan the toner mark 10 or the toner marks at the predetermined measuring locations a1, a2.
- the method described for determining the exact location of the toner mark 10 is used each time the printer or copier is set up for the first time. With this setting, a large number of toner marks are printed on the photoconductor drum FLT in order to achieve high precision in the setting.
- the method steps mentioned can also be carried out at predetermined time intervals, e.g. every 1 hour of operation, or every time you turn on the printer or copier (set up).
- the exemplary embodiment shown can be modified within the scope of the invention.
- the sensor 64 can scan the toner mark 10 after the transfer printing onto a carrier material, for example paper.
- a carrier material for example paper.
- the reflectivity of the carrier material is standardized.
- a photoconductor belt can be used instead of a photoconductor drum.
- Black toner material, colored toner material, a toner mixed from toner materials with different primary colors or a transparent toner material can be used as the toner.
- This variant is described for example in W098 / 39691 AI.
- the content of this WO publication is hereby incorporated by reference into the present description. List of reference symbols
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Control Or Security For Electrophotography (AREA)
- Dry Development In Electrophotography (AREA)
- Color Electrophotography (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/600,464 US6434346B1 (en) | 1998-01-16 | 1999-01-15 | Printing and photocopying device and method whereby one toner mark is scanned at at least two points of measurement |
CA002316162A CA2316162C (en) | 1998-01-16 | 1999-01-15 | Device and method for printing or copying in which a toner mark is scanned at at least two measurement points |
EP99904782A EP1047980B1 (de) | 1998-01-16 | 1999-01-15 | Einrichtung und verfahren zum drucken oder kopieren, wobei eine tonermarke an mindestens zwei messorten abgetastet wird |
JP2000540485A JP2002509291A (ja) | 1998-01-16 | 1999-01-15 | 少なくとも2つの測定個所においてトナーマークが走査される、印刷またはコピーのための装置及び方法 |
DE59901179T DE59901179D1 (de) | 1998-01-16 | 1999-01-15 | Einrichtung und verfahren zum drucken oder kopieren, wobei eine tonermarke an mindestens zwei messorten abgetastet wird |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19801521.6 | 1998-01-16 | ||
DE19801521 | 1998-01-16 | ||
DE19821922.9 | 1998-05-15 | ||
DE19821922 | 1998-05-15 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999036834A1 WO1999036834A1 (de) | 1999-07-22 |
WO1999036834A9 true WO1999036834A9 (de) | 1999-10-14 |
Family
ID=26043151
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1999/000211 WO1999036834A1 (de) | 1998-01-16 | 1999-01-15 | Einrichtung und verfahren zum drucken oder kopieren, wobei eine tonermarke an mindestens zwei messorten abgetastet wird |
Country Status (6)
Country | Link |
---|---|
US (1) | US6434346B1 (de) |
EP (1) | EP1047980B1 (de) |
JP (1) | JP2002509291A (de) |
CA (1) | CA2316162C (de) |
DE (1) | DE59901179D1 (de) |
WO (1) | WO1999036834A1 (de) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
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EP1254559A2 (de) * | 2000-02-04 | 2002-11-06 | Océ Printing Systems GmbH | Verfahren und einrichtung zur regelung der tonerkonzentration in einem elektrografischen prozess |
DE10136259A1 (de) * | 2001-07-25 | 2003-02-20 | Oce Printing Systems Gmbh | Verfahren und Einrichtung zum Steuern eines Druckprozesses bei hoher Farbdichte |
US6684035B2 (en) * | 2002-06-19 | 2004-01-27 | Nexpress Solutions Llc | Adjustable automatic process control density patch location detection |
DE10234711A1 (de) | 2002-07-30 | 2004-02-12 | OCé PRINTING SYSTEMS GMBH | Verfahren und Vorrichtung zur Minimierung von unerwünschtem Tonerübertrag in einer Umdruckstation eines elektrografischen Druckgeräts |
DE10246736A1 (de) | 2002-10-07 | 2004-04-22 | OCé PRINTING SYSTEMS GMBH | Verfahren und Vorrichtung zur Einstellung der Tonerzufuhr auf einen Mindestwert in eine Entwicklerstation einer elektrografischen Druck- oder Kopiereinrichtung |
DE10246733B4 (de) * | 2002-10-07 | 2004-09-30 | OCé PRINTING SYSTEMS GMBH | Verfahren zur verzögerungsfreien Umsetzung einer Änderung der Einstellung von Druckparameten auf das Druckbild bei einer elektrografischen Druck-oder Kopiereinrichtung |
DE10246737A1 (de) * | 2002-10-07 | 2004-01-15 | OCé PRINTING SYSTEMS GMBH | Verfahren zur Erzeugung eines neuen Träger und Toner aufweisenden Entwicklers in der Entwicklerstation einer elektrografischen Druck- oder Kopiereinrichtung |
US20040196282A1 (en) * | 2003-02-14 | 2004-10-07 | Oh Byong Mok | Modeling and editing image panoramas |
US7292797B2 (en) | 2004-03-02 | 2007-11-06 | Seiko Epson Corporation | Toner quantity measuring device, method of measuring toner quantity and image forming apparatus |
DE102006058579A1 (de) * | 2006-12-12 | 2008-06-26 | OCé PRINTING SYSTEMS GMBH | Verfahren und Vorrichtung zum Verarbeiten eines Messsignals zum Erfassen einer Eigenschaft einer Tonermarke |
JP4710964B2 (ja) * | 2008-11-28 | 2011-06-29 | ブラザー工業株式会社 | 画像形成装置 |
JP5822037B1 (ja) * | 2015-02-20 | 2015-11-24 | 富士ゼロックス株式会社 | 画像形成装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07120096B2 (ja) * | 1986-08-11 | 1995-12-20 | 株式会社リコー | 記録装置の画像濃度制御装置 |
JPS63254476A (ja) * | 1987-04-11 | 1988-10-21 | Minolta Camera Co Ltd | 電子写真複写機 |
JP3518812B2 (ja) * | 1993-04-30 | 2004-04-12 | 株式会社リコー | 画像形成装置 |
US5410388A (en) * | 1993-05-17 | 1995-04-25 | Xerox Corporation | Automatic compensation for toner concentration drift due to developer aging |
US5773827A (en) * | 1996-12-16 | 1998-06-30 | Xerox Corporation | Xerographic infrared reflectance densitometer (IRD) sensor |
US5966573A (en) * | 1998-10-08 | 1999-10-12 | Xerox Corporation | Seamed flexible electrostatographic imaging belt having a permanent localized solid attribute |
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1999
- 1999-01-15 DE DE59901179T patent/DE59901179D1/de not_active Expired - Lifetime
- 1999-01-15 US US09/600,464 patent/US6434346B1/en not_active Expired - Fee Related
- 1999-01-15 JP JP2000540485A patent/JP2002509291A/ja active Pending
- 1999-01-15 CA CA002316162A patent/CA2316162C/en not_active Expired - Fee Related
- 1999-01-15 WO PCT/EP1999/000211 patent/WO1999036834A1/de active IP Right Grant
- 1999-01-15 EP EP99904782A patent/EP1047980B1/de not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
CA2316162C (en) | 2007-09-04 |
EP1047980B1 (de) | 2002-04-10 |
EP1047980A1 (de) | 2000-11-02 |
US6434346B1 (en) | 2002-08-13 |
WO1999036834A1 (de) | 1999-07-22 |
JP2002509291A (ja) | 2002-03-26 |
DE59901179D1 (de) | 2002-05-16 |
CA2316162A1 (en) | 1999-07-22 |
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