EP1765595B1 - Verfahren zum mindestens teilweisen kompensieren von fehlern bei der tintenpunktpositionierung aufgrund von fehlerhafter drehverschiebung - Google Patents

Verfahren zum mindestens teilweisen kompensieren von fehlern bei der tintenpunktpositionierung aufgrund von fehlerhafter drehverschiebung Download PDF

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EP1765595B1
EP1765595B1 EP04734974A EP04734974A EP1765595B1 EP 1765595 B1 EP1765595 B1 EP 1765595B1 EP 04734974 A EP04734974 A EP 04734974A EP 04734974 A EP04734974 A EP 04734974A EP 1765595 B1 EP1765595 B1 EP 1765595B1
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Prior art keywords
printhead
sopec
row
segment
dot
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French (fr)
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EP1765595A1 (de
EP1765595A4 (de
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Simon R. W. Silverbrook Res. Pty Ltd WALMSLEY
Kia Silverbrook Res. Pty Ltd Silverbrook
M. Silverbrook Res. Pty Ltd JACKSON PULVER
John R. Silverbrook Res. Pty Ltd SHEAHAN
Richard T. Silverbrook Res. Pty Ltd PLUNKETT
Michael J. Silverbrook Res. Pty Ltd WEBB
Benjanim D. Silverbrook Res. Pty Ltd MORPHETT
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Silverbrook Research Pty Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2139—Compensation for malfunctioning nozzles creating dot place or dot size errors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04505—Control methods or devices therefor, e.g. driver circuits, control circuits aiming at correcting alignment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/0451—Control methods or devices therefor, e.g. driver circuits, control circuits for detecting failure, e.g. clogging, malfunctioning actuator
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04541—Specific driving circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04551—Control methods or devices therefor, e.g. driver circuits, control circuits using several operating modes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04563—Control methods or devices therefor, e.g. driver circuits, control circuits detecting head temperature; Ink temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04573—Timing; Delays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04586—Control methods or devices therefor, e.g. driver circuits, control circuits controlling heads of a type not covered by groups B41J2/04575 - B41J2/04585, or of an undefined type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/04—Ink jet characterised by the jet generation process generating single droplets or particles on demand
    • B41J2/045—Ink jet characterised by the jet generation process generating single droplets or particles on demand by pressure, e.g. electromechanical transducers
    • B41J2/04501—Control methods or devices therefor, e.g. driver circuits, control circuits
    • B41J2/04591—Width of the driving signal being adjusted
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/21—Ink jet for multi-colour printing
    • B41J2/2132—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding
    • B41J2/2146—Print quality control characterised by dot disposition, e.g. for reducing white stripes or banding for line print heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/20—Modules

Definitions

  • the present invention relates to a method of compensating for errors in ink dot placement due to erroneous rotational displacement of a printhead or printhead module.
  • the invention has primarily been developed for use in a pagewidth inkjet printer comprising a printer controller and a printhead having one or more printhead modules, and will be described with reference to this example. However, it will be appreciated that the invention is not limited to any particular type of printing technology, and is not limited to use in, for example, pagewidth and inkjet printing.
  • EP-A-1375146 describes a method for compensating the effect of rotationally displaced printhead modules in a printhead comprised of overlapping printhead modules. Compensation is by means of printing alternately from adjacent printhead modules in a region of overlap, or printing from only one printhead module in the region of overlap.
  • the present invention provides a method of at least partially compensating for errors in ink dot placement as herein defined in the appended claims.
  • printhead module and “printhead” are used somewhat interchangeably.
  • a “printhead” comprises one or more “printhead modules”, but occasionally the former is used to refer to the latter. It should be clear from the context which meaning should be allocated to any use of the word "printhead”.
  • the SoPEC ASIC (Small office home office Print Engine Controller) is suitable for use in price sensitive SoHo printer products.
  • the SoPEC ASIC is intended to be a relatively low cost solution for linking printhead control, replacing the multichip solutions in larger more professional systems with a single chip.
  • the increased cost competitiveness is achieved by integrating several systems such as a modified PEC1 printing pipeline, CPU control system, peripherals and memory sub-system onto one SoC ASIC, reducing component count and simplifying board design.
  • SoPEC contains features making it suitable for multifunction or "all-in-one" devices as well as dedicated printing systems.
  • SoPEC ASIC SoC SoPEC ASIC
  • the preferred embodiment linking printhead produces 1600 dpi bi-level dots. On low-diffusion paper, each ejected drop forms a 22.5 ⁇ m diameter dot. Dots are easily produced in isolation, allowing dispersed-dot dithering to be exploited to its fullest. Since the preferred form of the linking printhead is pagewidth and operates with a constant paper velocity, color planes are printed in good registration, allowing dot-on-dot printing. Dot-on-dot printing minimizes 'muddying' of midtones caused by inter-color bleed.
  • a page layout may contain a mixture of images, graphics and text. Continuous-tone (contone) images and graphics are reproduced using a stochastic dispersed-dot dither. Unlike a clustered-dot (or amplitude-modulated) dither, a dispersed-dot (or frequency-modulated) dither reproduces high spatial frequencies (i.e. image detail) almost to the limits of the dot resolution, while simultaneously reproducing lower spatial frequencies to their full color depth, when spatially integrated by the eye.
  • a stochastic dither matrix is carefully designed to be free of objectionable low-frequency patterns when tiled across the image. As such its size typically exceeds the minimum size required to support a particular number of intensity levels (e.g. 16 ⁇ 16 ⁇ 8 bits for 257 intensity levels).
  • Human contrast sensitivity peaks at a spatial frequency of about 3 cycles per degree of visual field and then falls off logarithmically, decreasing by a factor of 100 beyond about 40 cycles per degree and becoming immeasurable beyond 60 cycles per degree. At a normal viewing distance of 12 inches (about 300mm), this translates roughly to 200-300 cycles per inch (cpi) on the printed page, or 400-600 samples per inch according to Nyquist's theorem.
  • contone resolution above about 300 ppi is of limited utility outside special applications such as medical imaging.
  • Black text and graphics are reproduced directly using bi-level black dots, and are therefore not anti-aliased (i.e. low-pass filtered) before being printed. Text should therefore be supersampled beyond the perceptual limits discussed above, to produce smoother edges when spatially integrated by the eye. Text resolution up to about 1200 dpi continues to contribute to perceived text sharpness (assuming low-diffusion paper).
  • a Netpage printer may use a contone resolution of 267 ppi (i.e. 1600 dpi /6), and a black text and graphics resolution of 800 dpi.
  • a high end office or departmental printer may use a contone resolution of 320 ppi (1600 dpi / 5) and a black text and graphics resolution of 1600 dpi. Both formats are capable of exceeding the quality of commercial (offset) printing and photographic reproduction.
  • the SoPEC device can be used in several printer configurations and architectures.
  • SoPEC-based printer architecture will contain:
  • printer configurations as outlined in Section 4.2.
  • the various system components are outlined briefly in Section 4.1.
  • SoPEC system on a chip
  • SoC system on a chip
  • the PEP reads compressed page store data from the embedded memory, optionally decompresses the data and fonnats it for sending to the printhead.
  • the print engine pipeline functionality includes expanding the page image, dithering the contone layer, compositing the black layer over the contone layer, rendering of Netpage tags, compensation for dead nozzles in the printhead, and sending the resultant image to the linking printhead.
  • SoPEC contains an embedded CPU for general-purpose system configuration and management.
  • the CPU performs page and band header processing, motor control and sensor monitoring (via the GPIO) and other system control functions.
  • the CPU can perform buffer management or report buffer status to the host.
  • the CPU can optionally run vendor application specific code for general print control such as paper ready monitoring and LED status update.
  • a 2.5Mbyte embedded memory buffer is integrated onto the SoPEC device, of which approximately 2Mbytes are available for compressed page store data.
  • a compressed page is divided into one or more bands, with a number of bands stored in memory. As a band of the page is consumed by the PEP for printing a new band can be downloaded. The new band may be for the current page or the next page.
  • the embedded single-port USB2.0 device controller can be used either for interface to the host PC, or for communication with another SoPEC as an ISCSlave. It accepts compressed page data and control commands from the host PC or ISCMaster SoPEC, and transfers the data to the embedded memory for printing or downstream distribution.
  • the embedded three-port USB2.0 host controller enables communication with other SoPEC devices as a ISCMaster, as well as interfacing with external chips (e.g. for Ethernet connection) and external USB devices, such as digital cameras.
  • SoPEC contains embedded controllers for a variety of printer system components such as motors, LEDs etc, which are controlled via SoPEC's GPIOs. This minimizes the need for circuits external to SoPEC to build a complete printer system.
  • the printhead is constructed by abutting a number of printhead ICs together.
  • Each SoPEC can drive up to 12 printhead ICs at data rates up to 30ppm or 6 printhead ICs at data rates up to 60ppm. For higher data rates, or wider printheads, multiple SoPECs must be used.
  • Each SoPEC device has 2 LSS system buses for communication with QA devices for system authentication and ink usage accounting.
  • the number of QA devices per bus and their position in the system is unrestricted with the exception that PRINTER_QA and INK_QA devices should be on separate LSS busses.
  • Each SoPEC system can have several QA devices. Normally each printing SoPEC will have an associated PRINTER_QA. Ink cartridges will contain an INK_QA chip. PRINTER_QA and INK_QA devices should be on separate LSS busses. All QA chips in the system are physically identical with flash memory contents defining PRINTER_QA from INK_QA chip.
  • the primary communication channel is from a USB2.0 Host port on one SoPEC (the ISCMaster), to the USB2.0 Device port of each of the other SoPECs (ISCSlaves). If there are more ISCSlave SoPECs than available USB Host ports on the ISCMaster, additional connections could be via a USB Hub chip, or daisy-chained SoPEC chips. Typically one or more of SoPEC's GPIO signals would also be used to communicate specific events between multiple SoPECs.
  • the communication between the host PC and the ISCMaster SoPEC may involve an external chip or subsystem, to provide a non-USB host interface, such as ethernet or WiFi.
  • This subsystem may also contain memory to provide an additional buffered band/page store, which could provide guaranteed bandwidth data deliver to SoPEC during complex page prints.
  • SoPEC based system architectures exist. The following sections outline some possible architectures. It is possible to have extra SoPEC devices in the system used for DRAM storage.
  • the QA chip configurations shown are indicative of the flexibility of LSS bus architecture, but not limited to those configurations.
  • a single SoPEC device is used to control a linking printhead with 11 printhead ICs.
  • the SoPEC receives compressed data from the host through its USB device port.
  • the compressed data is processed and transferred to the printhead. This arrangement is limited to a speed of 30ppm.
  • the single SoPEC also controls all printer components such as motors, LEDs, buttons etc, either directly or indirectly.
  • SoPEC #0 is the ISCMaster
  • SoPEC #1 is an ISCSlave.
  • the ISCMaster receives all the compressed page data for both SoPECs and re-distributes the compressed data for the ISCSlave over a local USB bus. There is a total of 4MBytes of page store memory available if required. Note that, if each page has 2MBytes of compressed data, the USB2.0 interface to the host needs to run in high speed (not full speed) mode to sustain 60ppm printing. (In practice, many compressed pages will be much smaller than 2MBytes).
  • the control of printer components such as motors, LEDs, buttons etc, is shared between the 2 SoPECs in this configuration.
  • SoPEC #0 is the ISCMaster
  • SoPEC #1 is an ISCSlave
  • the ISCMaster receives all the compressed page data for both SoPECs and re-distributes the compressed data for the ISCSlave over a local USB bus. This configuration could print 30 double-sided pages per minute.
  • FIG 4 two SoPEC devices are used to control one A3 linking printhead, constructed from 16 printhead ICs. Each SoPEC controls 8 printhead ICs.
  • This system operates in a similar manner to the 60ppm A4 system in Figure 2 , although the speed is limited to 30ppm at A3, since each SoPEC can only drive 6 printhead ICs at 60ppm speeds.
  • a total of 4Mbyte of page store is available, this allows the system to use compression rates as in a single SoPEC A4 architecture, but with the increased page size of A3.
  • FIG. 5 a four SoPEC system is shown. It contains 2 A3 linking printheads, one for each side of an A3 page. Each printhead contain 16 printhead ICs, each SoPEC controls 8 printhead ICs. SoPEC #0 is the ISCMaster with the other SoPECs as ISCSlaves. Note that all 3 USB Host ports on SoPEC #0 are used to communicate with the 3 ISCSlave SoPECs. In total, the system contains 8Mbytes of compressed page store (2Mbytes per SoPEC), so the increased page size does not degrade the system print quality, from that of an A4 simplex printer. The ISCMaster receives all the compressed page data for all SoPECs and re-distributes the compressed data over the local USB bus to the ISCSlaves. This configuration could print 30 double-sided A3 sheets per minute.
  • SoPEC DRAM storage solution A4 Simplex with 1 printing SoPEC and 1 memory SoPEC
  • Extra SoPECs can be used for DRAM storage e.g. in Figure 6 an A4 simplex printer can be built with a single extra SoPEC used for DRAM storage.
  • the DRAM SoPEC can provide guaranteed bandwidth delivery of data to the printing SoPEC.
  • SoPEC configurations can have multiple extra SoPECs used for DRAM storage.
  • FIG. 7 shows a configuration in which the connection from the host PC to the printer is an ethernet network, rather than USB.
  • one of the USB Host ports on SoPEC interfaces to a external device that provide ethernet-to-USB bridging.
  • some networking software support in the bridging device might be required in this configuration.
  • a Flash RAM will be required in such a system, to provide SoPEC with driver software for the Ethernet bridging function.
  • a linking printhead is constructed from linking printhead ICs, placed on a substrate containing ink supply holes.
  • An A4 pagewidth printer used 11 linking printhead ICs. Each printhead is placed on the substrate with reference to positioning fidicuals on the substrate.
  • Figure 8 shows the arrangement of the printhead ICs (also known as segments) on a printhead. The join between two ICs is shown in detail. The left-most nozzles on each row are dropped by 10 line-pitches, to allow continuous printing across the join. Figure 8 also introduces some naming and co-ordinate conventions used throughout this document.
  • Figure 8 shows the anticipated first generation linking printhead nozzle arrangements, with 10 nozzle rows supporting five colours.
  • the SoPEC compensation mechanisms are general enough to cover other nozzle arrangements.
  • Printheads ICs may be misplaced relative to their ideal position. This misplacement may include any combination of:
  • the best visual results are achieved by considering relative misplacement between adjacent ICs, rather than absolute misplacement from the substrate. There are some practical limits to misplacement, in that a gross misplacement will stop the ink from flowing through the substrate to the ink channels on the chip.
  • misplacement Correcting for misplacement obviously requires the misplacement to be measured. In general this may be achieved directly by inspection of the printhead after assembly, or indirectly by scanning or examining a printed test pattern.
  • SoPEC can compensate for misplacement of linking chips in the X-direction, but only snapped to the nearest dot. That is, a misplacement error of less than 0.5 dot-pitches or 7.9375 microns is not compensated for, a misplacement more that 0.5 dot-pitches but less than 1.5 dot-pitches is treated as a misplacement of 1 dot-pitch, etc.
  • SoPEC can correct for each of these three effects.
  • SoPEC buffers in memory the dot data for a number of lines of the image to be printed. Compensation for misplacement generally involves changing the pattern in which this dot data is passed to the printhead ICs.
  • SoPEC uses separate buffers for the even and odd dots of each colour on each line, since they are printed by different printhead rows. So SoPEC's view of a line at this stage is as (up to) 12 rows of dots, rather than (up to) 6 colours. Nominally, the even dots for a line are printed by the lower of the two rows for that colour on the printhead, and the odd dots are printed by the upper row (see Figure 8 ). For the current linking printhead IC, there are 640 nozzles in row. Each row buffer for the full printhead would contain 640x11 dots per line to be printed, plus some padding if required.
  • SoPEC can be programmed in the DWU module to precompensate for the fact that each row on the printhead IC is shifted left with respect to the row above. In this way the leftmost dot printed by each row for a colour is the same offset from the start of a row buffer.
  • the programming can support arbitrary shapes for the printhead IC.
  • SoPEC has independent registers in the LLU module for each segment that determine which dot of the prepared image is sent to the left-most nozzle of that segment. Up to 12 segments are supported. With no misplacement, SoPEC could be programmed to pass dots 0 to 639 in a row to segment 0, dots 640 to 1279 in a row to segment 1, etc.
  • SoPEC could be adjusted to pass to dots 641 to 1280 of each row to segment 1 (remembering that each row of data consists entirely of either odd dots or even dots from a line, and that dot 1 on a row is printed two dot positions away from dot 0). This means the dots are printed in the correct position overall. This adjustment is based on the absolute placement of each printhead IC. Dot 640 is not printed at all, since there is no nozzle in that position on the printhead (see Section 6.1.2 for more detail on compensation for missing dots).
  • a misplacement of an odd number of dot-pitches is more problematic, because it means that the odd dots from the line now need to be printed by the lower row of a colour pair, and the even dots by the upper row of a colour pair on the printhead segment. Further, swapping the odd and even buffers interferes with the precompensation. This results in the position of the first dot to be sent to a segment being different for odd and even rows of the segment. SoPEC addresses this by having independent registers in the LLU to specify the first dot for the odd and even rows of each segment, i.e. 2 x 12 registers. A further register bit detennines whether dot data for odd and even rows should be swapped on a segment by segment basis.
  • Figure 9 shows the detailed alignment of dots at the join between two printhead ICs, for various cases of misplacement, for a single colour.
  • SoPEC has two registers per segment in the LLU that specify a number (up to 3) of dots to suppress at the start of each row, one register applying to even dot rows, one to odd dot rows.
  • SoPEC compensates for missing dots by add the missing nozzle position to its dead nozzle map. This tells the dead nozzle compensation logic in the DNC module to distribute the data from that position into the surrounding nozzles, before preparing the row buffers to be printed.
  • SoPEC can compensate for misplacement of printhead ICs in the Y-direction, but only snapped to the nearest 0.1 of a line. Assuming a line-pitch of 15.875 microns, if an IC is misplaced in Y by 0 microns, SoPEC can print perfectly in Y. If an IC is misplaced by 1.5875 microns in Y, then we can print perfectly. If an IC is misplaced in Y by 3.175 microns, we can print perfectly.
  • Uncompensated Y misplacement results in all the dots for the misplaced segment being printed in the wrong position on the page.
  • SoPEC's compensation for Y misplacement uses two mechanism, one to address whole line-pitch misplacement, and another to address fractional line-pitch misplacement. These mechanisms can be applied together, to compensate for arbitrary misplacements to the nearest 0.1 of a line.
  • Section 6.1 described the buffers used to hold dot data to be printed for each row. These buffers contain dot data for multiple lines of the image to be printed. Due to the physical separation of nozzle rows on a printhead IC, at any time different rows are printing data from different lines of the image.
  • row 0 of each segment is printing data from the line N of the image
  • row 1 of each segment is printing data from row N-M of the image etc.
  • N is the separation of rows 0 and 1 on the printhead.
  • SoPEC can compensate by adjusting the line of the image being sent to each row of that segment. This is achieved by adding an extra offset on the row buffer address used for that segment, for each row buffer. This offset causes SoPEC to provide the dot data to each row of that segment from one line further ahead in the image than the dot data provided to the same row on the other segments. For example, when the correctly placed segments are printing line N of an image with row 0, line N-M of the image with row 1, etc, then the misplaced segment is printing line N+1 of the image with row 0, line N-M+1 of the image with row 1, etc.
  • SoPEC has one register per segment to specify this whole line-pitch offset.
  • the offset can be multiple line-pitches, compensating for multiple lines of misplacement. Note that the offset can only be in the forward direction, corresponding to a negative Y offset. This means the initial setup of SoPEC must be based on the highest (most positive) Y-axis segment placement, and the offsets for other segments calculated from this baseline. Compensating for Y displacement requires extra lines of dot data buffering in SoPEC, equal to the maximum relative Y offset (in line-pitches) between any two segments on the printhead. For each misplaced segment, each line of misplacement requires approximately 640x10 or 6400 extra bits of memory.
  • the nozzle rows in the printhead are positioned by design with vertical spacings in line-pitches that have a integer and fractional component.
  • the fractional components are expressed relative to row zero, and are always some multiple of 0.1 of a line-pitch.
  • the rows are fired sequentially in a given order, and the fractional component of the row spacing matches the distance the paper will move between one row firing and the next.
  • Figure 10 shows the row position and firing order on the current implementation of the printhead IC. Looking at the first two rows, the paper moves by 0.5 of a line-pitch between the row 0 (fired first) and row 1 (fired sixth). is supplied with dot data from a line 3 lines before the data supplied to row 0. This data ends up on the paper exactly 3 line-pitches apart, as required.
  • row 0 of that segment no longer aligns to row 0 of other segments.
  • row 0 of the misplaced segment no longer aligns to row 0 of other segments.
  • this row is fired at the same time as row 0 of the other segments, and it is supplied with dot data from the correct line, then its dots will line up with the dots from row 0 of the other segments, to within a 0.1 of a line-pitch.
  • Subsequent rows on the misplaced printhead can then be fired in their usual order, wrapping back to row 0 after row 9. This firing order results in each row firing at the same time as the rows on the other printheads closest to an integer number of line-pitches away.
  • Figure 11 shows an example, in which the misplaced segment is offset by 0.3 of a line-pitch.
  • row 5 of the misplaced segment is exactly 24.0 line-pitches from row 0 of the ideal segment. Therefore row 5 is fired first on the misplaced segment, followed by row 7, 9, 0 etc. as shown. Each row is fired at the same time as the a row on the ideal segment that is an integer number of lines away. This selection of the start row of the firing sequence is controlled by a register in each printhead IC.
  • SoPEC's role in the compensation for fractional line-pitch misplacement is to supply the correct dot data for each row. Looking at Figure 11 , we can see that to print correct, row 5 on the misplaced printhead needs dot data from a line 24 lines earlier in the image than the data supplied to row 0. On the ideal printhead, row 5 needs dot data from a line 23 lines earlier in the image than the data supplied to row 0. In general, when a non-default start row is used for a segment, some rows for that segment need their data to be offset by one line, relative to the data they would receive for a default start row. SoPEC has a register in LLU for each row of each segment, that specifies whether to apply a one line offset when fetching data for that row of that segment.
  • This kind of erroneous rotational displacement means that all the nozzles will end up pointing further up the page in Y or further down the page in Y.
  • the effect is the same as a Y misplacement, except there is a different Y effect for each media thickness (since the amount of misplacement depends on the distance the ink has to travel).
  • the media thickness makes no effective visual difference to the outcome, and this form of misplacement can simply be incorporated into the Y misplacement compensation. If the media thickness does make a difference which can be characterised, then the Y misplacement programming can be adjusted for each print, based on the media thickness.
  • correction for roll is particularly of interest where more than one printhead module is used to form a printhead, since it is the discontinuities between strips printed by adjacent modules that are most objectionable in this context.
  • one end of the IC is further into the substrate than the other end.
  • the printing on the page will be dots further apart at the end that is further away from the media (i.e. less optical density), and dots will be closer together at the end that is closest to the media (more optical density) with a linear fade of the effect from one extreme to the other. Whether this produces any kind of visual artifact is unknown, but it is not compensated for in SoPEC.
  • This kind of erroneous rotational displacement means that the nozzles at one end of a IC will print further down the page in Y than the other end of the IC. There may also be a slight increase in optical density depending on the rotation amount.
  • SoPEC can compensate for this by providing first order continuity, although not second order continuity in the preferred embodiment.
  • First order continuity in which the Y position of adjacent line ends is matched
  • Second order continuity in which the slope of the lines in adjacent print modules is at least partially equalised
  • SoPEC does not compensate for it and so it is not described here in detail.
  • Figure 12 shows an example where printhead IC number 4 is be placed with yaw, is shown in Figure 12 , while all other ICs on the printhead are perfectly placed.
  • the effect of yaw is that the left end of segment 4 of the printhead has an apparent Y offset of -1 line-pitch relative to segment 3, while the right end of segment 4 has an apparent Y offset of 1 line-pitch relative to segment 5.
  • the registers on SoPEC would be programmed such that segments 0 to 3 have a Y offset of 0, segment 4 has a Y offset of -1, and segments 5 and above have Y offset of -2. Note that the Y offsets accumulate in this example - even though segment 5 is perfect aligned to segment 3, they have different Y offsets programmed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Ink Jet (AREA)
  • Record Information Processing For Printing (AREA)
  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Printers Characterized By Their Purpose (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Controls And Circuits For Display Device (AREA)

Claims (4)

  1. Ein Verfahren zum mindestens teilweisen Kompensieren von Fehlern bei der Tintenpunktpositionierung durch mindestens eine Vielzahl von Düsen bedingt durch fehlerhafte rotationale Scherverschiebung eines aus einer Vielzahl von angrenzenden Druckkopfmodulen, die auf einem Träger zum Bilden eines Druckkopfes angebracht sind, wobei das Verfahren den folgenden Schritt umfasst:
    (a) Bestimmen der rotationalen Scherverschiebung des fehlerhaft verschobenen Druckkopfmoduls;
    und durch die folgenden Schritte gekennzeichnet ist:
    (b) Bestimmen eines akkumulativen Y-Versatzes für jedes Druckkopfmodul in dem Druckkopf, so dass eine Y-Position von benachbarten gedruckten Linienenden angepasst wird; und
    (c) Verändern der Ausgabe der Tintenpunkte aus Düsen in jedem Druckkopfmodul, das einen von Null verschiedenen akkumulativen Y-Versatz aufweist, um die rotationale Scherverschiebung des fehlerhaft verschobenen Druckkopfmoduls mindestens teilweise zu kompensieren.
  2. Ein Verfahren nach Anspruch 1, wobei der Schritt (c) das Verändern einer Zeitvorgabe eines Ausstoßsignals bei mindestens einer der Düsen auf der Basis eines akkumulativen Y-Versatzes für ein jeweiliges Druckkopfmodul einschließt, das die mindestens eine Düse beinhaltet, um dadurch die mindestens teilweise Kompensation zu bewirken.
  3. Ein Verfahren nach Anspruch 1, wobei die akkumulativen Y-Versätze in einem mit dem Druckkopf assoziierten Speicher gespeichert werden.
  4. Eine Druckersteuerung, die zum Implementieren des Verfahrens nach einem der vorstehenden Ansprüche programmiert und konfiguriert ist.
EP04734974A 2004-05-27 2004-05-27 Verfahren zum mindestens teilweisen kompensieren von fehlern bei der tintenpunktpositionierung aufgrund von fehlerhafter drehverschiebung Expired - Lifetime EP1765595B1 (de)

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PCT/AU2004/000706 WO2005120835A1 (en) 2004-05-27 2004-05-27 Method for at least partially compensating for errors in ink dot placement due to erroneous rotational displacement

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EP10193974.2 Division-Into 2010-12-07

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EP04734974A Expired - Lifetime EP1765595B1 (de) 2004-05-27 2004-05-27 Verfahren zum mindestens teilweisen kompensieren von fehlern bei der tintenpunktpositionierung aufgrund von fehlerhafter drehverschiebung

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AU2009203012A1 (en) 2009-08-13
EP2301753A1 (de) 2011-03-30
AU2009203030B2 (en) 2010-07-01
AU2009203015A1 (en) 2009-08-13
AU2008207608B2 (en) 2009-05-21
AU2009203025A1 (en) 2009-08-13
AU2009203026A1 (en) 2009-08-13
ES2393541T3 (es) 2012-12-26
AU2009203033A1 (en) 2009-08-13
AU2008207608A1 (en) 2008-09-18
EP2301753B1 (de) 2012-08-22
ATE501857T1 (de) 2011-04-15
DE602004031888D1 (de) 2011-04-28
AU2009203025B2 (en) 2010-06-03
AU2004320526A1 (en) 2005-12-22
EP1765595A1 (de) 2007-03-28
AU2009203031B2 (en) 2010-06-10
AU2009203033B2 (en) 2010-06-03
AU2009203015B2 (en) 2010-06-24
AU2009203027B2 (en) 2010-06-10
AU2009203032B2 (en) 2010-06-03
CA2567724A1 (en) 2005-12-22
AU2009203027A1 (en) 2009-08-13
WO2005120835A1 (en) 2005-12-22
AU2004320526B2 (en) 2008-08-07
CY1113337T1 (el) 2016-06-22
AU2009203031A1 (en) 2009-08-13
PT2301753E (pt) 2013-01-23
AU2009203012B2 (en) 2010-07-15
AU2009203026B2 (en) 2010-06-24
AU2009203028A1 (en) 2009-08-13
AU2009203030A1 (en) 2009-08-13
EP1765595A4 (de) 2009-10-21

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