JPS57104952A - Printing machine - Google Patents

Printing machine

Info

Publication number
JPS57104952A
JPS57104952A JP55181744A JP18174480A JPS57104952A JP S57104952 A JPS57104952 A JP S57104952A JP 55181744 A JP55181744 A JP 55181744A JP 18174480 A JP18174480 A JP 18174480A JP S57104952 A JPS57104952 A JP S57104952A
Authority
JP
Japan
Prior art keywords
signal
gradation
signals
supplied
array
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
JP55181744A
Other languages
Japanese (ja)
Inventor
Kenji Aoki
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.)
Seiko Epson Corp
Suwa Seikosha KK
Original Assignee
Seiko Epson Corp
Suwa Seikosha KK
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 Seiko Epson Corp, Suwa Seikosha KK filed Critical Seiko Epson Corp
Priority to JP55181744A priority Critical patent/JPS57104952A/en
Publication of JPS57104952A publication Critical patent/JPS57104952A/en
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
    • H04N1/40—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)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)

Abstract

PURPOSE:To realize the printing with gradation, by providing a signal generating circuit to produce the signals by varying the number of pulses in accordance with the gradation signal supplied from outside, and controlling the open/close frequency of a liquid crystal shutter within the same writing cycle. CONSTITUTION:An optical signal generating part 17 comprises a light wave 12, a liquid crystal shutter array 11 and an image forming optical system 10, and produces the optical signals. A photoreceptor 13 is previously charged with electricity by a charger 15, and a latent image formed by the optical signals is developed by a developer 14 to be transcribed to the transfer paper through a transfer part 8. The array 11 has plural shutters. An ON-OFF signal and a gradation signal are supplied to a signal producing circuit 1, and the number of pulses is delivered to outside in accordance with the gradation. These two signals are supplied to a drive part 2 and then actually applied to the array 11.
JP55181744A 1980-12-22 1980-12-22 Printing machine Pending JPS57104952A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55181744A JPS57104952A (en) 1980-12-22 1980-12-22 Printing machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55181744A JPS57104952A (en) 1980-12-22 1980-12-22 Printing machine

Publications (1)

Publication Number Publication Date
JPS57104952A true JPS57104952A (en) 1982-06-30

Family

ID=16106122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55181744A Pending JPS57104952A (en) 1980-12-22 1980-12-22 Printing machine

Country Status (1)

Country Link
JP (1) JPS57104952A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168418A (en) * 1983-03-15 1984-09-22 Canon Inc Image forming device
JPS59168419A (en) * 1983-03-15 1984-09-22 Canon Inc Image forming device
JPS6067973A (en) * 1983-09-22 1985-04-18 Canon Inc Image processor
JPS62142062U (en) * 1986-03-03 1987-09-08
US4697910A (en) * 1983-03-15 1987-10-06 Canon Kabushiki Kaisha Image processor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59168418A (en) * 1983-03-15 1984-09-22 Canon Inc Image forming device
JPS59168419A (en) * 1983-03-15 1984-09-22 Canon Inc Image forming device
US4697910A (en) * 1983-03-15 1987-10-06 Canon Kabushiki Kaisha Image processor
JPS6067973A (en) * 1983-09-22 1985-04-18 Canon Inc Image processor
JPS62142062U (en) * 1986-03-03 1987-09-08

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