WO1991017627A3 - Apparatus and method for grey level printing using a binary architectured printhead - Google Patents

Apparatus and method for grey level printing using a binary architectured printhead Download PDF

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Publication number
WO1991017627A3
WO1991017627A3 PCT/US1991/003089 US9103089W WO9117627A3 WO 1991017627 A3 WO1991017627 A3 WO 1991017627A3 US 9103089 W US9103089 W US 9103089W WO 9117627 A3 WO9117627 A3 WO 9117627A3
Authority
WO
WIPO (PCT)
Prior art keywords
pulses
recording
grey level
strobe
binary
Prior art date
Application number
PCT/US1991/003089
Other languages
French (fr)
Other versions
WO1991017627A2 (en
Inventor
Yee S Ng
Hurjay Yeh
Joseph Basile
Original Assignee
Eastman Kodak Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US07/521,511 external-priority patent/US5138337A/en
Priority claimed from US07/609,868 external-priority patent/US5255013A/en
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Priority to DE69114668T priority Critical patent/DE69114668T2/en
Priority to EP91909353A priority patent/EP0483321B1/en
Publication of WO1991017627A2 publication Critical patent/WO1991017627A2/en
Publication of WO1991017627A3 publication Critical patent/WO1991017627A3/en

Links

Classifications

    • 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
    • H04N1/40—Picture signal circuits
    • H04N1/40025—Circuits exciting or modulating particular heads for reproducing continuous tone value scales
    • H04N1/40031—Circuits exciting or modulating particular heads for reproducing continuous tone value scales for a plurality of reproducing elements simultaneously
    • 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
    • H04N1/40—Picture signal circuits
    • H04N1/401—Compensating positionally unequal response of the pick-up or reproducing head
    • H04N1/4015—Compensating positionally unequal response of the pick-up or reproducing head of the reproducing head
    • 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
    • H04N1/40—Picture signal circuits
    • H04N1/405—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels
    • H04N1/4055—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern
    • H04N1/4056—Halftoning, i.e. converting the picture signal of a continuous-tone original into a corresponding signal showing only two levels producing a clustered dots or a size modulated halftone pattern the pattern varying in one dimension only, e.g. dash length, pulse width modulation [PWM]

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

A binary architectured LED printhead (25, 125) is driven in accordance with a multiple addressable, i.e., multiple sublines of recording, scheme to record grey level pixels. Respective sublines are recorded using a series of pulses that form a set of binary-weighted exposure strobe durations. Exposure durations for recording successive strobed sublines with a particular LED (20, 120) are ordered so that larger duration strobe pulses are followed by shorter duration strobe pulses. A plurality of strobe enable lines are provided to which respective recording elements are connected. A pulse from this set is generated during a subline exposure period on each enable line with each enable line having a pulse generated thereon that is of a different duration than that generated on the other enabling lines during the subline recording period and wherein during a subline exposure period the respective pulses on the enabling lines are substantially nonconcurrent. In one embodiment a series of data bits are formatted for presentation to the printhead (125) by a retransmit line buffer (206, 208) which transmits n times the data of one line of grey level pixels represented by n bits each to a process correction look-up table (220, 222). Another look-up table (216, 218) provides a signal to the process look-up table as to the intensity characteristics of the particular LED which is to print the pixel. The corrected grey level data is then input to a multiplexer (228, 230) which selects one of the n bits for printing in accordance with count signals related to the binary weight of the recording clock pulses.
PCT/US1991/003089 1990-05-10 1991-05-06 Apparatus and method for grey level printing using a binary architectured printhead WO1991017627A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE69114668T DE69114668T2 (en) 1990-05-10 1991-05-06 DEVICE AND METHOD FOR GRAY VALUE PRINTING USING A PRINT HEAD WITH BINARY ARCHITECTURE.
EP91909353A EP0483321B1 (en) 1990-05-10 1991-05-06 Apparatus and method for grey level printing using a binary architectured printhead

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/521,511 US5138337A (en) 1990-05-10 1990-05-10 Apparatus for grey level printing using a binary architectured printhead
US521,511 1990-05-10
US07/609,868 US5255013A (en) 1990-11-07 1990-11-07 Multiple address grey level LED printing with binary architectured printhead
US609,868 1990-11-07

Publications (2)

Publication Number Publication Date
WO1991017627A2 WO1991017627A2 (en) 1991-11-14
WO1991017627A3 true WO1991017627A3 (en) 1992-04-02

Family

ID=27060492

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1991/003089 WO1991017627A2 (en) 1990-05-10 1991-05-06 Apparatus and method for grey level printing using a binary architectured printhead

Country Status (4)

Country Link
EP (2) EP0671844B1 (en)
JP (1) JPH05500146A (en)
DE (2) DE69131655T2 (en)
WO (1) WO1991017627A2 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5546513A (en) * 1993-09-20 1996-08-13 Eastman Kodak Company Data transmission system for sparse array print head
EP0663759A1 (en) * 1994-01-14 1995-07-19 Xerox Corporation Digital LED printer with multiple print imaging modes
JPH07223337A (en) * 1994-01-14 1995-08-22 Xerox Corp Method of correcting optical conversion efficiency of led picture element in digital printer and led print bar
US5699168A (en) * 1995-06-22 1997-12-16 Texas Instruments Incorporated Grayscale printing with sliding window memory
JPH10173918A (en) * 1996-12-16 1998-06-26 Alps Electric Co Ltd Shading correcting method of image read means, and image processor
GB2316259B (en) * 1996-08-12 2000-09-06 Alps Electric Co Ltd Image sensing apparatus and shading correction method
DE69620204T2 (en) * 1996-12-23 2002-10-24 Agfa-Gevaert, Mortsel Printers and printing processes
US7602411B2 (en) * 2003-06-12 2009-10-13 Oki Data Corporation Image forming apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074319A (en) * 1976-12-13 1978-02-14 Bell Telephone Laboratories, Incorporated Light emitting diode array imaging system - parallel approach
US4525729A (en) * 1983-04-04 1985-06-25 Polaroid Corporation Parallel LED exposure control system
WO1988010042A1 (en) * 1987-06-03 1988-12-15 Eastman Kodak Company Energizing heating elements of a thermal printer
US4855760A (en) * 1987-03-12 1989-08-08 Fuji Photo Film Co., Ltd. LED array with graduated quantity control
EP0375431A2 (en) * 1988-12-22 1990-06-27 Xerox Corporation Bandwidth reduced multi-pass writing of variable gray level digital images

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4074319A (en) * 1976-12-13 1978-02-14 Bell Telephone Laboratories, Incorporated Light emitting diode array imaging system - parallel approach
US4525729A (en) * 1983-04-04 1985-06-25 Polaroid Corporation Parallel LED exposure control system
US4855760A (en) * 1987-03-12 1989-08-08 Fuji Photo Film Co., Ltd. LED array with graduated quantity control
WO1988010042A1 (en) * 1987-06-03 1988-12-15 Eastman Kodak Company Energizing heating elements of a thermal printer
EP0375431A2 (en) * 1988-12-22 1990-06-27 Xerox Corporation Bandwidth reduced multi-pass writing of variable gray level digital images

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Journal of Imaging Technology, volume 12, no. 5, October 1986 (Springfield, US) I. Abiko et al.: "High printing quality LED printheads", pages 296-299, see section III; figures 1,3 *

Also Published As

Publication number Publication date
EP0671844B1 (en) 1999-09-22
WO1991017627A2 (en) 1991-11-14
EP0671844A1 (en) 1995-09-13
EP0483321B1 (en) 1995-11-15
DE69114668T2 (en) 1996-09-19
EP0483321A1 (en) 1992-05-06
JPH05500146A (en) 1993-01-14
DE69114668D1 (en) 1995-12-21
DE69131655T2 (en) 2000-03-02
DE69131655D1 (en) 1999-10-28

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