JP2001310501A - クロックに依存しないパルス幅変調 - Google Patents

クロックに依存しないパルス幅変調

Info

Publication number
JP2001310501A
JP2001310501A JP2001082810A JP2001082810A JP2001310501A JP 2001310501 A JP2001310501 A JP 2001310501A JP 2001082810 A JP2001082810 A JP 2001082810A JP 2001082810 A JP2001082810 A JP 2001082810A JP 2001310501 A JP2001310501 A JP 2001310501A
Authority
JP
Japan
Prior art keywords
clock
edge
circuit
video
output
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.)
Pending
Application number
JP2001082810A
Other languages
English (en)
Japanese (ja)
Other versions
JP2001310501A5 (enExample
Inventor
Robert D Morrison
ロバート・ディー・モリソン
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.)
HP Inc
Original Assignee
Hewlett Packard 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
Application filed by Hewlett Packard Co filed Critical Hewlett Packard Co
Publication of JP2001310501A publication Critical patent/JP2001310501A/ja
Publication of JP2001310501A5 publication Critical patent/JP2001310501A5/ja
Pending 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/0402—Scanning different formats; Scanning with different densities of dots per unit length, e.g. different numbers of dots per inch (dpi); Conversion of scanning standards
    • H04N1/042—Details of the method used
    • H04N1/0446—Varying the modulation time or intensity
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; 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
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
    • G06K15/1204—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers involving the fast moving of an optical beam in the main scanning direction
    • G06K15/1223—Resolution control, enlarging or reducing, edge or detail enhancement
    • 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/047—Detection, control or error compensation of scanning velocity or position
    • H04N1/053—Detection, control or error compensation of scanning velocity or position in main scanning direction, e.g. synchronisation of line start or picture elements in a line
    • 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/113—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors
    • H04N1/1135—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using oscillating or rotating mirrors for the main-scan only
    • 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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
    • H04N1/12—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using the sheet-feed movement or the medium-advance or the drum-rotation movement as the slow scanning component, e.g. arrangements for the main-scanning
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/024—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof deleted
    • H04N2201/02406—Arrangements for positioning elements within a head
    • H04N2201/02439—Positioning method
    • H04N2201/02443—Positioning method using adhesive
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/047—Detection, control or error compensation of scanning velocity or position
    • H04N2201/04701—Detection of scanning velocity or position
    • H04N2201/0471—Detection of scanning velocity or position using dedicated detectors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/047—Detection, control or error compensation of scanning velocity or position
    • H04N2201/04701—Detection of scanning velocity or position
    • H04N2201/04732—Detecting at infrequent intervals, e.g. once or twice per line for main-scan control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/047—Detection, control or error compensation of scanning velocity or position
    • H04N2201/04701—Detection of scanning velocity or position
    • H04N2201/04744—Detection of scanning velocity or position by detecting the scanned beam or a reference beam
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/047—Detection, control or error compensation of scanning velocity or position
    • H04N2201/04753—Control or error compensation of scanning position or velocity
    • H04N2201/04758—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area
    • H04N2201/04767—Control or error compensation of scanning position or velocity by controlling the position of the scanned image area by controlling the timing of the signals, e.g. by controlling the frequency o phase of the pixel clock
    • H04N2201/04781—Controlling the phase of the signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
    • H04N2201/04—Scanning arrangements
    • H04N2201/047—Detection, control or error compensation of scanning velocity or position
    • H04N2201/04753—Control or error compensation of scanning position or velocity
    • H04N2201/04794—Varying the control or compensation during the scan, e.g. using continuous feedback or from line to line
    • H04N2201/04798—Varying the main-scan control during the main-scan, e.g. facet tracking

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Laser Beam Printer (AREA)
JP2001082810A 2000-03-24 2001-03-22 クロックに依存しないパルス幅変調 Pending JP2001310501A (ja)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/534803 2000-03-24
US09/534,803 US6366307B1 (en) 2000-03-24 2000-03-24 Clock independent pulse width modulation

Publications (2)

Publication Number Publication Date
JP2001310501A true JP2001310501A (ja) 2001-11-06
JP2001310501A5 JP2001310501A5 (enExample) 2007-10-25

Family

ID=24131593

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001082810A Pending JP2001310501A (ja) 2000-03-24 2001-03-22 クロックに依存しないパルス幅変調

Country Status (2)

Country Link
US (1) US6366307B1 (enExample)
JP (1) JP2001310501A (enExample)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6885228B2 (en) 2002-10-02 2005-04-26 Hewlett-Packard Development Company, L.P. Non-iterative signal synchronization
US6980041B2 (en) * 2002-10-04 2005-12-27 Hewlett-Packard Development Company, L.P. Non-iterative introduction of phase delay into signal without feedback
US20040145647A1 (en) * 2003-01-23 2004-07-29 Morrison Robert D Nonlinear transformation of pixel width
US6856340B2 (en) * 2003-01-28 2005-02-15 Hewlett-Packard Development Company, L.P. System and method for clock independent pulse width modulation
US6950118B2 (en) * 2003-01-30 2005-09-27 Hewlett-Packard Development Company, L.P. Laser imaging device including a pulse width modulator system
US7042484B2 (en) * 2003-03-20 2006-05-09 Hewlett-Packard Development Company, L.P. Scan line length adjustment
US7061519B2 (en) * 2003-08-09 2006-06-13 Hewlett-Packard Development Company, L.P. Scaling an image
US7639407B2 (en) * 2004-03-24 2009-12-29 Lexmark International, Inc. Systems for performing laser beam linearity correction and algorithms and methods for generating linearity correction tables from data stored in an optical scanner
KR101617215B1 (ko) * 2007-07-06 2016-05-03 삼성디스플레이 주식회사 액정 표시 장치 및 그의 구동 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6478213A (en) * 1987-09-18 1989-03-23 Fuji Photo Film Co Ltd Synchronizing circuit for optical scanning device
JPH06188691A (ja) * 1992-12-18 1994-07-08 Toshiba Corp パルス幅制御装置
JPH1130899A (ja) * 1997-07-11 1999-02-02 Sharp Corp 画像形成装置
JPH11317871A (ja) * 1997-11-14 1999-11-16 Hewlett Packard Co <Hp> パルス幅変調回路

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62275768A (ja) 1986-05-24 1987-11-30 Sony Corp プリント装置
US5185768A (en) * 1990-10-09 1993-02-09 International Business Machines Corporation Digital integrating clock extractor
US5477330A (en) * 1992-10-16 1995-12-19 Printware, Inc. Synchronization to a start-of-scan detection, and digital generation of variable frequencies, from a fixed-frequency fixed-phase frequency source in an image generator in order to highly accurately time the placement of pixels upon a scan line
US5438353A (en) 1992-11-02 1995-08-01 Hewlett-Packard Company Clock signal generator for electrophotographic printers
US5760816A (en) 1996-02-06 1998-06-02 Hewlett-Packard Company Variable phase clock generator for an electrophotographic printer
US5793709A (en) * 1996-04-19 1998-08-11 Xli Corporation Free loop interval timer and modulator
JP3487119B2 (ja) * 1996-05-07 2004-01-13 松下電器産業株式会社 ドットクロック再生装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6478213A (en) * 1987-09-18 1989-03-23 Fuji Photo Film Co Ltd Synchronizing circuit for optical scanning device
JPH06188691A (ja) * 1992-12-18 1994-07-08 Toshiba Corp パルス幅制御装置
JPH1130899A (ja) * 1997-07-11 1999-02-02 Sharp Corp 画像形成装置
JPH11317871A (ja) * 1997-11-14 1999-11-16 Hewlett Packard Co <Hp> パルス幅変調回路

Also Published As

Publication number Publication date
US6366307B1 (en) 2002-04-02

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