CA2370954A1 - A duplex network color printer - Google Patents
A duplex network color printer Download PDFInfo
- Publication number
- CA2370954A1 CA2370954A1 CA002370954A CA2370954A CA2370954A1 CA 2370954 A1 CA2370954 A1 CA 2370954A1 CA 002370954 A CA002370954 A CA 002370954A CA 2370954 A CA2370954 A CA 2370954A CA 2370954 A1 CA2370954 A1 CA 2370954A1
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- CA
- Canada
- Prior art keywords
- printhead
- data
- printheads
- controller
- nozzles
- 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.)
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Classifications
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
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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
- B41J11/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form
- B41J11/0015—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, for supporting or handling copy material in sheet or web form for treating before, during or after printing or for uniform coating or laminating the copy material before or after printing
- B41J11/002—Curing or drying the ink on the copy materials, e.g. by heating or irradiating
- B41J11/0021—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation
- B41J11/00216—Curing or drying the ink on the copy materials, e.g. by heating or irradiating using irradiation using infrared [IR] radiation or microwaves
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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
- B41J2/0057—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 where an intermediate transfer member receives the ink before transferring it on the printing material
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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
-
- 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
- B41J2/04508—Control methods or devices therefor, e.g. driver circuits, control circuits aiming at correcting other parameters
-
- 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
- B41J2/04586—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
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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
- B41J2/135—Nozzles
- B41J2/14—Structure thereof only for on-demand ink jet heads
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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
- B41J2/135—Nozzles
- B41J2/145—Arrangement thereof
- B41J2/155—Arrangement thereof for line printing
-
- 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
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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
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/60—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for printing on both faces of the printing material
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F15/00—Digital computers in general; Data processing equipment in general
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/12—Digital output to print unit, e.g. line printer, chain printer
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
- H04N1/393—Enlarging or reducing
-
- 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
- B41J2202/21—Line printing
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Quality & Reliability (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Human Computer Interaction (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Computer Hardware Design (AREA)
- Ink Jet (AREA)
- Accessory Devices And Overall Control Thereof (AREA)
- Record Information Processing For Printing (AREA)
- Particle Formation And Scattering Control In Inkjet Printers (AREA)
- Color Printing (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Coloring (AREA)
- Color, Gradation (AREA)
- Printers Characterized By Their Purpose (AREA)
- Paper (AREA)
- Color Image Communication Systems (AREA)
- Electrophotography Using Other Than Carlson'S Method (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Percussion Or Vibration Massage (AREA)
- Telephone Function (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
Abstract
A print engine (26.1, 26.2) for a printer includes a first and a second printhead (112). Both printheads (112) include a plurality of inkjet nozzles constructed using microelectromechanical techniques. The printheads (112) are matched so that defective nozzles in one printhead (112) are substituted by corresponding non-defective nozzles in the other printhead (112).
Claims (57)
1. A print engine for a printer, the print engine including:
a first printhead; and a second printhead, both printheads including a plurality of inkjet nozzles constructed using microelectromechanical techniques, the printheads being matched so that defective nozzles in one printhead are substituted by corresponding, non-defective nozzles in the other printhead.
a first printhead; and a second printhead, both printheads including a plurality of inkjet nozzles constructed using microelectromechanical techniques, the printheads being matched so that defective nozzles in one printhead are substituted by corresponding, non-defective nozzles in the other printhead.
2. The print engine as claimed in claim 1 in which each printhead is a pagewidth printhead.
3. The print engine as claimed in claim 2 in which the printheads are arranged side-by-side in spaced, parallel relationship.
4. The print engine as claimed in claim 3 which includes a transfer roller rotatably arranged adjacent the printheads for transferring ink from the printheads to media passing the roller, the printheads being arranged in circumferentially spaced relationship relative to, and adjacent, the roller, with the printheads extending parallel to a rotational axis of the roller.
5. The print engine as claimed in claim 4 in which the transfer roller is displaceable into abutment with the printheads when no printing is occurring for inhibiting evaporation of ink from the printheads.
6. The print engine as claimed in claim 4 which includes a cleaning station for cleaning a surface of the transfer roller.
7. The print engine as claimed in claim 4 which includes a drying means arranged downstream of the roller.
8. The print engine as claimed in claim 1 in which the printheads share a common ink supply.
9. The print engine as claimed in claim 1 in which the printheads, at a time of manufacture, are characterised and matched so that no two corresponding nozzles are both defective.
10. The print engine as claimed in claim 9 which includes a defect list which provides an indication of which nozzle of a matched pair is to be used.
11. The print engine as claimed in claim 10 in which the defect list is encoded and incorporated therein.
12. A printing station for a printer, the printing station including a first print engine as claimed in claim 4; and a second print engine, as claimed in claim 4, arranged in opposed, aligned relationship, with the transfer rollers of the print engines abutting against each other to effect printing on both surfaces of a sheet of print media passing between the transfer rollers.
13. The printing station as claimed in claim 12 in which the printheads of both print engines receive ink from a common ink supply.
14. The printing station as claimed in claim 13 which includes the ink supply, the ink supply comprising a plurality of separate ink cartridges, each of a different color, to provide for color printing.
15. The printing station as claimed in claim 14 which includes an ink reservoir associated with each ink cartridge so that, when an ink cartridge is mounted on its associated reservoir, an interior of the cartridge is in fluid flow communication with the reservoir via a valve arrangement.
16. The printing station as claimed in claim 12 in which the second print engine is displaceably arranged relative to the first print engine for enabling access to be gained to a print media path defined between the print engines.
17. A method of manufacturing a printhead assembly for a pagewidth printer, the method including the steps of:
providing a first printhead including a plurality of inkjet nozzles constructed using microelectromechanical techniques;
selecting a second printhead of the same construction as the first printhead;
and matching the first printhead to the second printhead by ensuring that no corresponding, paired nozzles of the two printheads are both defective.
providing a first printhead including a plurality of inkjet nozzles constructed using microelectromechanical techniques;
selecting a second printhead of the same construction as the first printhead;
and matching the first printhead to the second printhead by ensuring that no corresponding, paired nozzles of the two printheads are both defective.
18. The method as claimed in claim 17 which includes constructing each printhead from a plurality of segments arranged in end-to-end relationship.
19. The method as claimed in claim 18 which includes characterising and matching printhead defects one segment at a time during construction of the printheads.
20. The method as claimed in claim 19 which includes testing the nozzles of the relevant segments without ink before integration with an ink path.
21. The method as claimed in claim 17 which includes characterising and matching printhead defects after each printhead has been assembled in its entirety.
22. The method as claimed in claim 21 which includes testing the nozzles with ink after integration with an ink path.
23. A printhead assembly for a pagewidth printer, the assembly including a pair of printheads, each printhead including a plurality of inkjet nozzles constructed using microelectromechanical techniques, the printheads being selected and matched so that no two corresponding, paired nozzles of the printheads are both defective.
24. The assembly as claimed in claim 23 in which each printhead is constituted by a plurality of segments arranged in end-to-end relationship.
25. The assembly as claimed in claim 24 in which printhead defects are characterised and matched one segment at a time.
26. The assembly as claimed in claim 25 in which the nozzles are tested without ink before integration with an ink path.
27. The assembly as claimed in claim 23 in which printhead defects are characterised and matched after completion of the entire printhead.
28. The assembly as claimed in claim 25 in which the nozzles are tested with ink after integration with an ink path.
29. A method of characterising a printhead assembly for a printer, the method including:
matching a pair of printheads, each printhead including a plurality of inkjet nozzles constructed using microelectromechanical techniques, such that no corresponding nozzles of the pair of printheads are both defective;
determining which nozzle of a pair is to be used and generating data relating to the nozzle to be used; and encoding said data and associating said encoded data with the printhead assembly.
matching a pair of printheads, each printhead including a plurality of inkjet nozzles constructed using microelectromechanical techniques, such that no corresponding nozzles of the pair of printheads are both defective;
determining which nozzle of a pair is to be used and generating data relating to the nozzle to be used; and encoding said data and associating said encoded data with the printhead assembly.
30. The method as claimed in claim 29 in which the data relating to the nozzles to be used consists of a list of defective nozzles and the method includes storing the defect list in a manufacturing database.
31. The method as claimed in claim 30 which includes indexing the defect list with an identification device of the assembly.
32. The method as claimed in claim 30 which includes encoding the defect list in a readable format and applying it to a cartridge of the assembly.
33. The method as claimed in claim 32 which includes, when the cartridge is installed in a printer, retrieving the defect list and writing the defect list to a memory means of a printer controller of the printer.
34. A printhead assembly with includes:
a pair of matched printheads, each printhead including a plurality of inkjet nozzles constructed using microelectromechanical techniques, the printheads being matched so that no paired nozzles of the pair of printheads are both defective; and encoded data relating to a defect list associated with the printheads, the defect list providing data relating to which nozzle of each pair of matched nozzles of the pair of printheads is to be used.
a pair of matched printheads, each printhead including a plurality of inkjet nozzles constructed using microelectromechanical techniques, the printheads being matched so that no paired nozzles of the pair of printheads are both defective; and encoded data relating to a defect list associated with the printheads, the defect list providing data relating to which nozzle of each pair of matched nozzles of the pair of printheads is to be used.
35. The assembly as claimed in claim 34 in which the defect list is associated with an identification device of the assembly and is stored in a manufacturing database.
36. The assembly as claimed in claim 34 which includes a printhead cartridge, the defect list, in its encoded format, being applied to the cartridge to be readable by a printer when the cartridge is installed in the printer.
37. A printer controller for an inkjet printer, the controller including:
a processing means for receiving incoming data relating to a description of a page to be printed, said descriptions containing color data and black text data;
a memory means in which the data are stored;
a rasterizing and compressing means for rasterizing and compressing the data, the compression of the color data and the black text data being effected separately from each other; and a printhead controller for receiving, decompressing and processing said data for printing via a printhead under control of the printhead controller.
a processing means for receiving incoming data relating to a description of a page to be printed, said descriptions containing color data and black text data;
a memory means in which the data are stored;
a rasterizing and compressing means for rasterizing and compressing the data, the compression of the color data and the black text data being effected separately from each other; and a printhead controller for receiving, decompressing and processing said data for printing via a printhead under control of the printhead controller.
38. The printer controller as claimed in claim 37 in which the rasterizing and compressing means includes at least one raster image processor (RIP) digital signal processor (DSP)
39. The printer controller as claimed in claim 38 in which the, or each, RIP
DSP communicates with the processing means via a data communications means, the processing means feeding and synchronizing the, or each, RIP DSP, the rasterizing and compressing means, and the printhead controller.
DSP communicates with the processing means via a data communications means, the processing means feeding and synchronizing the, or each, RIP DSP, the rasterizing and compressing means, and the printhead controller.
40. The printer controller as claimed in claim 39 in which the, or each, RIP
DSP communicates with the memory mans via the processing means and the data communications means for storing rasterized and compressed data in the memory means.
DSP communicates with the memory mans via the processing means and the data communications means for storing rasterized and compressed data in the memory means.
41. The printer controller as claimed in claim 37 in which the memory means is a hard disk which communicates with the processing means via a disk controller and a data communications means.
42. In an inkjet printer controller, a method of printing a description of a page containing color data and black text data, the method including the steps of:
receiving said data relating to a description of a page to be printed from a host processor;
storing the received data in a memory means;
rasterizing and compressing the received data to create a compressed page format, the compression of the color data and the black text data being effected separately from each other;
feeding the compressed page format data to a printhead controller; and expanding the compressed page format data in the printhead controller prior to printing of the image.
receiving said data relating to a description of a page to be printed from a host processor;
storing the received data in a memory means;
rasterizing and compressing the received data to create a compressed page format, the compression of the color data and the black text data being effected separately from each other;
feeding the compressed page format data to a printhead controller; and expanding the compressed page format data in the printhead controller prior to printing of the image.
43. The method as claimed in claim 42 which includes, prior to feeding the compressed page format data to the printhead controller, storing the compressed page format data in the memory means.
44. The method as claimed in claim 42 which includes, as the data are expanded, feeding the expanded data to at least one printhead controlled by the printhead controller.
45. The method as claimed in claim 44 which includes, when the printhead controller receives the compressed page format data, storing the data in a local memory means of the printhead controller.
46. A printhead controller for controlling printing of a page by at least one printhead, the printhead controller being connected, in use, via a data communications link to a printer controller for receiving data, in a compressed format, relating to the page to be printed, the data including a page description comprising a bi-level black layer and a contone color layer, the printhead controller including:
a first decoding means for expanding compressed data relating to the bi-level black layer;
a second decoding means for expanding compressed data relating to the contone color layer, the first and second decoding means being arranged in parallel;
a first temporary storage device for storing the expanded data from the first decoding means;
a second temporary storage device for storing the expanded data from the second decoding means;
a data manipulating means for manipulating the data output from the first and second temporary storage devices to be fed to the printhead; and a printhead interface at an output from the data manipulating means for controlling at least one printhead connectable to the interface and for feeding the manipulated data to the printhead.
a first decoding means for expanding compressed data relating to the bi-level black layer;
a second decoding means for expanding compressed data relating to the contone color layer, the first and second decoding means being arranged in parallel;
a first temporary storage device for storing the expanded data from the first decoding means;
a second temporary storage device for storing the expanded data from the second decoding means;
a data manipulating means for manipulating the data output from the first and second temporary storage devices to be fed to the printhead; and a printhead interface at an output from the data manipulating means for controlling at least one printhead connectable to the interface and for feeding the manipulated data to the printhead.
47. The printhead controller as claimed in claim 46 in which the first decoding means is a lossless bi-level decompression device for decompressing the bi-level black layer.
48. The printhead controller as claimed in claim 46 in which the second decoding means is a high-quality lossy decompression device for decompressing the contone color layer.
49. The printhead controller as claimed in claim 46 in which the data manipulating means includes a ditherer/compositor unit and a third temporary storage device at an output to the unit, the unit being operable to composite the bi-level black layer on the contone color layer after dithering of the color layer.
50. The printhead controller as claimed in claim 49 in which each of the first temporary storage device, the second temporary storage device and the third temporary storage device is a dedicated, on-chip FIFO.
5I. The printhead controller as claimed in claim 46 which functions as a self synchronising pipeline.
52. In a printhead controller for controlling printing of a page by a printhead, the printhead controller being connected, in use, via a data communications link to a printer controller for receiving data, in a compressed format, relating to the page to be printed, the data including a page description comprising a bi-level black layer and a contone color layer, a method of controlling at least one printhead connected to the printhead controller, the method including the steps of:
expanding compressed data relating to the bi-level black layer;
expanding compressed data relating to the contone color layer;
storing the expanded data in first and second temporary storage devices, respectively;
feeding the expanded data from the storage devices to a data manipulating means;
manipulating the data into a format suitable for printing;
loading at least one printhead with dots to be printed in accordance with the formatted, manipulated data; and printing the dots.
expanding compressed data relating to the bi-level black layer;
expanding compressed data relating to the contone color layer;
storing the expanded data in first and second temporary storage devices, respectively;
feeding the expanded data from the storage devices to a data manipulating means;
manipulating the data into a format suitable for printing;
loading at least one printhead with dots to be printed in accordance with the formatted, manipulated data; and printing the dots.
53. The method as claimed in claim 52 in which the steps of expanding the two layers occurs substantially simultaneously.
54. The method as claimed in claim 52 which includes expanding the data relating to the bi-level black layer using a lossless bi-level decompression device.
55. The method as claimed in claim 52 which includes expanding the data relating to the contone color layer using a high quality lossy decompression device.
56. The method as claimed in claim 52 in which the manipulating of the data includes dithering the contone color layer, compositing the bi-level black layer on the dithered contone color layer and temporarily storing a dithered/composited layer so formed in a storage device prior to printing the dots.
57. The method as claimed in claim 52 which includes operating the printhead controller as a self-synchronising pipeline.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AUPP9960A AUPP996099A0 (en) | 1999-04-23 | 1999-04-23 | A method and apparatus(sprint01) |
AUPP9960 | 1999-04-23 | ||
PCT/AU2000/000114 WO2000064679A1 (en) | 1999-04-23 | 2000-02-17 | A duplex network color printer |
Publications (2)
Publication Number | Publication Date |
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CA2370954A1 true CA2370954A1 (en) | 2000-11-02 |
CA2370954C CA2370954C (en) | 2009-12-08 |
Family
ID=3814159
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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CN (2) | CN1329812C (en) |
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1999
- 1999-04-23 AU AUPP9960A patent/AUPP996099A0/en not_active Abandoned
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2000
- 2000-02-15 US US09/505,150 patent/US6533390B1/en not_active Expired - Fee Related
- 2000-02-15 US US09/505,151 patent/US6454378B1/en not_active Expired - Lifetime
- 2000-02-15 US US09/505,008 patent/US6559969B1/en not_active Expired - Fee Related
- 2000-02-15 US US09/505,011 patent/US6364451B1/en not_active Expired - Fee Related
- 2000-02-15 US US09/505,003 patent/US7224478B1/en not_active Expired - Fee Related
- 2000-02-17 SG SG200306325-2A patent/SG148821A1/en unknown
- 2000-02-17 WO PCT/AU2000/000114 patent/WO2000064679A1/en active IP Right Grant
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- 2000-02-17 EP EP00904738A patent/EP1175301B1/en not_active Expired - Lifetime
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- 2000-02-17 CN CNB2005100655447A patent/CN1329812C/en not_active Expired - Fee Related
- 2000-02-17 SG SG200306326-0A patent/SG144696A1/en unknown
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- 2000-02-17 KR KR1020067016967A patent/KR20060103473A/en not_active Application Discontinuation
- 2000-02-17 AU AU26519/00A patent/AU773771B2/en not_active Ceased
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2002
- 2002-10-15 US US10/269,999 patent/US6896362B2/en not_active Expired - Lifetime
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2003
- 2003-02-07 HK HK03100892.6A patent/HK1048787A1/en unknown
- 2003-04-24 US US10/421,824 patent/US6982799B2/en not_active Expired - Fee Related
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2004
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2005
- 2005-02-28 US US11/066,310 patent/US20050140714A1/en not_active Abandoned
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2007
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2009
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2011
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