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

Info

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
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.)
Ceased
Application number
PCT/US1991/003089
Other languages
French (fr)
Other versions
WO1991017627A2 (en
Inventor
Yee S Ng
Hurjay Yeh
Joseph Basile
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
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 EP91909353A priority Critical patent/EP0483321B1/en
Priority to DE69114668T priority patent/DE69114668T2/en
Publication of WO1991017627A2 publication Critical patent/WO1991017627A2/en
Publication of WO1991017627A3 publication Critical patent/WO1991017627A3/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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 Ceased WO1991017627A2 (en)

Priority Applications (2)

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

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US521,511 1990-05-10
US07/521,511 US5138337A (en) 1990-05-10 1990-05-10 Apparatus for grey level printing using a binary architectured printhead
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 Ceased 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) DE69114668T2 (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
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
EP0663759A1 (en) * 1994-01-14 1995-07-19 Xerox Corporation Digital LED printer with multiple print imaging modes
US5699168A (en) * 1995-06-22 1997-12-16 Texas Instruments Incorporated Grayscale printing with sliding window memory
GB2316259B (en) * 1996-08-12 2000-09-06 Alps Electric Co Ltd Image sensing apparatus and shading correction method
JPH10173918A (en) * 1996-12-16 1998-06-26 Alps Electric Co Ltd Shading correcting method of image read means, and image processor
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
WO1991017627A2 (en) 1991-11-14
DE69114668T2 (en) 1996-09-19
DE69131655D1 (en) 1999-10-28
EP0671844A1 (en) 1995-09-13
EP0483321A1 (en) 1992-05-06
EP0483321B1 (en) 1995-11-15
JPH05500146A (en) 1993-01-14
DE69131655T2 (en) 2000-03-02
DE69114668D1 (en) 1995-12-21
EP0671844B1 (en) 1999-09-22

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