WO1991009490A3 - Imprimante par points amelioree et procede ameliore d'enregistrement de niveaux de gris - Google Patents
Imprimante par points amelioree et procede ameliore d'enregistrement de niveaux de gris Download PDFInfo
- Publication number
- WO1991009490A3 WO1991009490A3 PCT/US1990/007310 US9007310W WO9109490A3 WO 1991009490 A3 WO1991009490 A3 WO 1991009490A3 US 9007310 W US9007310 W US 9007310W WO 9109490 A3 WO9109490 A3 WO 9109490A3
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- led
- time
- counters
- count
- printer
- Prior art date
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]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/02—Digital function generators
- G06F1/025—Digital function generators for functions having two-valued amplitude, e.g. Walsh functions
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Dot-Matrix Printers And Others (AREA)
Abstract
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91902008A EP0460184B1 (fr) | 1989-12-18 | 1990-12-17 | Imprimante par points amelioree et procede ameliore d'enregistrement de niveaux de gris |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/451,898 US5111217A (en) | 1989-12-18 | 1989-12-18 | Dot printer and method for grey level recording |
US451,898 | 1989-12-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1991009490A2 WO1991009490A2 (fr) | 1991-06-27 |
WO1991009490A3 true WO1991009490A3 (fr) | 1991-08-22 |
Family
ID=23794150
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1990/007310 WO1991009490A2 (fr) | 1989-12-18 | 1990-12-17 | Imprimante par points amelioree et procede ameliore d'enregistrement de niveaux de gris |
Country Status (4)
Country | Link |
---|---|
US (1) | US5111217A (fr) |
EP (1) | EP0460184B1 (fr) |
JP (1) | JPH04504045A (fr) |
WO (1) | WO1991009490A2 (fr) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE69122382T2 (de) * | 1991-06-24 | 1997-04-03 | Agfa Gevaert Nv | Parallel-Serie-Umwandlung von Informationsdaten |
US5327524A (en) * | 1992-12-28 | 1994-07-05 | Eastman Kodak Company | Electrophotographic recording with multiple-bit grey level LED printhead with enhanced addressability |
JP3272800B2 (ja) * | 1993-01-19 | 2002-04-08 | キヤノン株式会社 | カラー記録装置 |
US5493322A (en) * | 1993-04-01 | 1996-02-20 | Eastman Kodak Company | Electrophotographic image forming apparatus with non-uniformity correction of recording elements |
US5585836A (en) * | 1993-12-27 | 1996-12-17 | Eastman Kodak Company | Electrophotographic image recording apparatus and method with correction for bow in placement of recording elements |
US5604527A (en) * | 1993-12-28 | 1997-02-18 | Eastman Kodak Company | Dot printer and method for grey level recording with different bit-depth dimensions |
JPH07223337A (ja) * | 1994-01-14 | 1995-08-22 | Xerox Corp | デジタルプリンター、及びledプリントバーにおけるled画素の光電変換効率の補正方法 |
JPH0958019A (ja) * | 1995-08-22 | 1997-03-04 | Brother Ind Ltd | 画像形成装置 |
GB9815157D0 (en) * | 1998-07-13 | 1998-09-09 | Metron Designs Ltd | High resolution pulse width setting from relatively low frequency clocks |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0188023A1 (fr) * | 1984-12-24 | 1986-07-23 | Océ-Nederland B.V. | Procédé pour exposer une couche photosensible et dispositif d'exposition |
EP0204094A2 (fr) * | 1985-03-30 | 1986-12-10 | Hitachi, Ltd. | Procédé d'impression du type d'enregistrement par balayage et appareil pour le mettre en oeuvre |
EP0213891A2 (fr) * | 1985-08-20 | 1987-03-11 | Canon Kabushiki Kaisha | Appareil de traitement d'image |
US4750010A (en) * | 1987-01-02 | 1988-06-07 | Eastman Kodak Company | Circuit for generating center pulse width modulated waveforms and non-impact printer using same |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3850517A (en) * | 1972-09-25 | 1974-11-26 | Xerox Corp | High speed printout system |
US4831395A (en) * | 1987-04-01 | 1989-05-16 | Eastman Kodak Company | Printer apparatus |
US4799071A (en) * | 1987-09-21 | 1989-01-17 | Eastman Kodak Company | Dot printer with age compensation means |
US4746941A (en) * | 1987-10-13 | 1988-05-24 | Eastman Kodak Company | Dot printer with token bit selection of data latching |
US4821066A (en) * | 1988-02-22 | 1989-04-11 | Eastman Kodak Company | Nonimpact printer |
JP3003864B2 (ja) * | 1988-04-14 | 2000-01-31 | 株式会社リコー | 固体走査型記録ヘッドの駆動方法及びその装置 |
JP2774521B2 (ja) * | 1988-09-14 | 1998-07-09 | キヤノン株式会社 | レーザ記録装置 |
US4885597A (en) * | 1988-12-27 | 1989-12-05 | Eastman Kodak Company | Non-impact printer apparatus with improved current mirror driver and method of printing |
-
1989
- 1989-12-18 US US07/451,898 patent/US5111217A/en not_active Expired - Fee Related
-
1990
- 1990-12-17 JP JP3502770A patent/JPH04504045A/ja active Pending
- 1990-12-17 WO PCT/US1990/007310 patent/WO1991009490A2/fr active IP Right Grant
- 1990-12-17 EP EP91902008A patent/EP0460184B1/fr not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0188023A1 (fr) * | 1984-12-24 | 1986-07-23 | Océ-Nederland B.V. | Procédé pour exposer une couche photosensible et dispositif d'exposition |
EP0204094A2 (fr) * | 1985-03-30 | 1986-12-10 | Hitachi, Ltd. | Procédé d'impression du type d'enregistrement par balayage et appareil pour le mettre en oeuvre |
EP0213891A2 (fr) * | 1985-08-20 | 1987-03-11 | Canon Kabushiki Kaisha | Appareil de traitement d'image |
US4750010A (en) * | 1987-01-02 | 1988-06-07 | Eastman Kodak Company | Circuit for generating center pulse width modulated waveforms and non-impact printer using same |
Non-Patent Citations (1)
Title |
---|
PROCEEDINGS OF THE SID vol. 21, no. 2, 1980, LOS ANGELES US pages 171 - 175; Nakaya et al.: "Gray-scale thermal recording" * |
Also Published As
Publication number | Publication date |
---|---|
EP0460184A1 (fr) | 1991-12-11 |
EP0460184B1 (fr) | 1994-09-21 |
JPH04504045A (ja) | 1992-07-16 |
US5111217A (en) | 1992-05-05 |
WO1991009490A2 (fr) | 1991-06-27 |
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