JPS56126378A - Synchronous circuit of optical scanner - Google Patents

Synchronous circuit of optical scanner

Info

Publication number
JPS56126378A
JPS56126378A JP2988880A JP2988880A JPS56126378A JP S56126378 A JPS56126378 A JP S56126378A JP 2988880 A JP2988880 A JP 2988880A JP 2988880 A JP2988880 A JP 2988880A JP S56126378 A JPS56126378 A JP S56126378A
Authority
JP
Japan
Prior art keywords
picture
clock
picture element
output
frequency
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.)
Granted
Application number
JP2988880A
Other languages
Japanese (ja)
Other versions
JPS6341466B2 (en
Inventor
Onori Abe
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 JP2988880A priority Critical patent/JPS56126378A/en
Publication of JPS56126378A publication Critical patent/JPS56126378A/en
Publication of JPS6341466B2 publication Critical patent/JPS6341466B2/ja
Granted 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
    • H04N1/047—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

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Mechanical Optical Scanning Systems (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Fax Reproducing Arrangements (AREA)
  • Facsimile Transmission Control (AREA)

Abstract

PURPOSE:To limit the jitter in the main scanning direction that is caused in a recorded picture by a shift of phase between the sensor output and the picture lement clock, by sending the picture element clock to a delay element and delaying the frequency of the clock by 1/n. CONSTITUTION:The output of an oscillator 13 of the picture element clock (frequency fO) is sent to the delay line element 14 having (n) taps, and the phase of the picture element clock is delayed by 1/n. Then the tap output having the phase matching with the detection output of an optical sensor is selected properly by the switch circuit SW that works in accordance with the sensor output. This selected tap output is used for the new picture element clock, and the writing timing of a picture is secured after counting several picture element clocks. In other words, the frequency of the picture element clock is delayed successively by 1/n with use of the delay element 14 in order to secure the cyclic timing with the sensor output. Thus the jitter of the main scanning direction and caused in a recorded picture can be reduced down to one picture element/n.
JP2988880A 1980-03-10 1980-03-10 Synchronous circuit of optical scanner Granted JPS56126378A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2988880A JPS56126378A (en) 1980-03-10 1980-03-10 Synchronous circuit of optical scanner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2988880A JPS56126378A (en) 1980-03-10 1980-03-10 Synchronous circuit of optical scanner

Publications (2)

Publication Number Publication Date
JPS56126378A true JPS56126378A (en) 1981-10-03
JPS6341466B2 JPS6341466B2 (en) 1988-08-17

Family

ID=12288501

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2988880A Granted JPS56126378A (en) 1980-03-10 1980-03-10 Synchronous circuit of optical scanner

Country Status (1)

Country Link
JP (1) JPS56126378A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58220588A (en) * 1982-06-17 1983-12-22 Toshiba Corp Video signal processor
JPS6147922A (en) * 1984-08-15 1986-03-08 Ricoh Co Ltd Optical scanner
EP0213866A2 (en) * 1985-08-22 1987-03-11 Rank Pullin Controls Limited Imaging apparatus
JPS63108878A (en) * 1986-10-27 1988-05-13 Seikosha Co Ltd Synchronizing signal generating circuit
US4912564A (en) * 1988-02-26 1990-03-27 Hitachi, Ltd. Clock signal generation apparatus
US5014137A (en) * 1984-12-25 1991-05-07 Ricoh Company, Ltd. Method of generating an image scanning clock signal for an optical scanning device by selecting one of a plurality of out-of-phase clock signals
JPH05110388A (en) * 1990-11-26 1993-04-30 Mitsubishi Electric Corp Synchronizing clock generating circuit, delay pulse generating circuit using the same cl0ck generating circuit and latch circuit used for the said pulse generating circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06232738A (en) * 1993-02-03 1994-08-19 Mitsubishi Electric Corp Synchronous pulse generating circuit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53122329A (en) * 1977-04-01 1978-10-25 Fujitsu Ltd Synchronous control system for scanned light beam

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53122329A (en) * 1977-04-01 1978-10-25 Fujitsu Ltd Synchronous control system for scanned light beam

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58220588A (en) * 1982-06-17 1983-12-22 Toshiba Corp Video signal processor
JPH0218633B2 (en) * 1982-06-17 1990-04-26 Tokyo Shibaura Electric Co
JPS6147922A (en) * 1984-08-15 1986-03-08 Ricoh Co Ltd Optical scanner
JPH0560085B2 (en) * 1984-08-15 1993-09-01 Ricoh Kk
US5014137A (en) * 1984-12-25 1991-05-07 Ricoh Company, Ltd. Method of generating an image scanning clock signal for an optical scanning device by selecting one of a plurality of out-of-phase clock signals
EP0213866A2 (en) * 1985-08-22 1987-03-11 Rank Pullin Controls Limited Imaging apparatus
JPS63108878A (en) * 1986-10-27 1988-05-13 Seikosha Co Ltd Synchronizing signal generating circuit
US4912564A (en) * 1988-02-26 1990-03-27 Hitachi, Ltd. Clock signal generation apparatus
JPH05110388A (en) * 1990-11-26 1993-04-30 Mitsubishi Electric Corp Synchronizing clock generating circuit, delay pulse generating circuit using the same cl0ck generating circuit and latch circuit used for the said pulse generating circuit

Also Published As

Publication number Publication date
JPS6341466B2 (en) 1988-08-17

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