JPS641547A - Image forming apparatus - Google Patents

Image forming apparatus

Info

Publication number
JPS641547A
JPS641547A JP62282832A JP28283287A JPS641547A JP S641547 A JPS641547 A JP S641547A JP 62282832 A JP62282832 A JP 62282832A JP 28283287 A JP28283287 A JP 28283287A JP S641547 A JPS641547 A JP S641547A
Authority
JP
Japan
Prior art keywords
transistors
inverters
gamma
dot
turned
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
JP62282832A
Other languages
Japanese (ja)
Other versions
JPH011547A (en
Inventor
Kenichiro 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
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP62-282832A priority Critical patent/JPH011547A/en
Priority claimed from JP62-282832A external-priority patent/JPH011547A/en
Publication of JPS641547A publication Critical patent/JPS641547A/en
Publication of JPH011547A publication Critical patent/JPH011547A/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
    • H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Dot-Matrix Printers And Others (AREA)
  • Laser Beam Printer (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Facsimile Scanning Arrangements (AREA)

Abstract

PURPOSE:To perform multi-gradation expression without deteriorating resolving power, by providing a value other than two white and black values to one dot and performing gradation expression of three values or more. CONSTITUTION:Inverters 211-21n are connected to the respective n-bit outputs of a gamma-converter circuit 15 and a switch 22 of n-circuit two-contact is connected to the output of each of the inverters. Transistors 231-23n are subjected to ON/OFF control by the n-bit digital signals from the gamma-converter circuit 15 but, since the inverters 21 are provided, the transistors 23 are turned ON when the output of the gamma-converter circuit 15 is an L-level and the current flowing to a laser diode 1 is changed corresponding to the ON-number of the transistors 23 and, when all of the transistors 23 are turned ON, a current iLD does not flow to the laser diode 1 and, when all of the transistors 23 are turned OFF, the max. current flows to the laser diode. Therefore, gradation can be provided to one dot by changing the power of laser beam at every one dot and an image of high resolving power can be expressed.
JP62-282832A 1987-01-20 1987-11-09 image forming device Pending JPH011547A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62-282832A JPH011547A (en) 1987-01-20 1987-11-09 image forming device

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP62-10859 1987-01-20
JP1085987 1987-01-20
JP62-282832A JPH011547A (en) 1987-01-20 1987-11-09 image forming device

Publications (2)

Publication Number Publication Date
JPS641547A true JPS641547A (en) 1989-01-05
JPH011547A JPH011547A (en) 1989-01-05

Family

ID=

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2372412A1 (en) 2010-03-26 2011-10-05 Fujifilm Corporation Patterned birefringent product

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2372412A1 (en) 2010-03-26 2011-10-05 Fujifilm Corporation Patterned birefringent product

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