GB2264024A - Image forming apparatus - Google Patents

Image forming apparatus Download PDF

Info

Publication number
GB2264024A
GB2264024A GB9301731A GB9301731A GB2264024A GB 2264024 A GB2264024 A GB 2264024A GB 9301731 A GB9301731 A GB 9301731A GB 9301731 A GB9301731 A GB 9301731A GB 2264024 A GB2264024 A GB 2264024A
Authority
GB
United Kingdom
Prior art keywords
timing
image
signal
image data
tone
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.)
Withdrawn
Application number
GB9301731A
Other languages
English (en)
Other versions
GB9301731D0 (en
Inventor
Kenichirou Asada
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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 JP4323295A external-priority patent/JPH05270058A/ja
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Publication of GB9301731D0 publication Critical patent/GB9301731D0/en
Publication of GB2264024A publication Critical patent/GB2264024A/en
Withdrawn legal-status Critical Current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
    • H04N1/405—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]
    • 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
    • H04N1/23—Reproducing arrangements
    • H04N1/29—Reproducing arrangements involving production of an electrostatic intermediate picture
    • H04N1/295—Circuits or arrangements for the control thereof, e.g. using a programmed control device, according to a measured quantity
    • 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
    • H04N1/40087—Multi-toning, i.e. converting a continuous-tone signal for reproduction with more than two discrete brightnesses or optical densities, e.g. dots of grey and black inks on white paper

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Laser Beam Printer (AREA)
  • Color, Gradation (AREA)
  • Fax Reproducing Arrangements (AREA)
GB9301731A 1992-01-31 1993-01-28 Image forming apparatus Withdrawn GB2264024A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1644492 1992-01-31
JP4323295A JPH05270058A (ja) 1992-01-31 1992-12-02 画像形成装置

Publications (2)

Publication Number Publication Date
GB9301731D0 GB9301731D0 (en) 1993-03-17
GB2264024A true GB2264024A (en) 1993-08-11

Family

ID=26352796

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9301731A Withdrawn GB2264024A (en) 1992-01-31 1993-01-28 Image forming apparatus

Country Status (2)

Country Link
DE (1) DE4302651C2 (enrdf_load_stackoverflow)
GB (1) GB2264024A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0653878A3 (en) * 1993-11-12 1995-06-21 Tektronix, Inc. Halftone pattern geometry for printing high quality images
WO2000021278A1 (en) * 1998-10-02 2000-04-13 Electronics For Imaging, Inc. Self calibrating pulse width modulator for use in electrostatic printing applications

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479537A2 (en) * 1990-10-03 1992-04-08 Canon Kabushiki Kaisha Image formation apparatus
EP0514849A2 (en) * 1991-05-20 1992-11-25 Canon Kabushiki Kaisha Image processing apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3329311A1 (de) * 1983-08-13 1985-02-28 Ricoh Co., Ltd., Tokio/Tokyo System zum ansteuern eines thermodruckkopfs
JP3155538B2 (ja) * 1989-05-30 2001-04-09 株式会社リコー レーザの多階調書き込み装置
JPH06311342A (ja) * 1993-04-23 1994-11-04 Canon Inc ファクシミリ装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479537A2 (en) * 1990-10-03 1992-04-08 Canon Kabushiki Kaisha Image formation apparatus
EP0514849A2 (en) * 1991-05-20 1992-11-25 Canon Kabushiki Kaisha Image processing apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0653878A3 (en) * 1993-11-12 1995-06-21 Tektronix, Inc. Halftone pattern geometry for printing high quality images
US5957593A (en) * 1993-11-12 1999-09-28 Tektronix, Inc. Halftone pattern geometry for printing high quality images
WO2000021278A1 (en) * 1998-10-02 2000-04-13 Electronics For Imaging, Inc. Self calibrating pulse width modulator for use in electrostatic printing applications
US6166821A (en) * 1998-10-02 2000-12-26 Electronics For Imaging, Inc. Self calibrating pulse width modulator for use in electrostatic printing applications

Also Published As

Publication number Publication date
GB9301731D0 (en) 1993-03-17
DE4302651C2 (de) 1998-09-03
DE4302651A1 (enrdf_load_stackoverflow) 1993-08-05

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)