JPS5511225A - Printing density detector - Google Patents

Printing density detector

Info

Publication number
JPS5511225A
JPS5511225A JP8407878A JP8407878A JPS5511225A JP S5511225 A JPS5511225 A JP S5511225A JP 8407878 A JP8407878 A JP 8407878A JP 8407878 A JP8407878 A JP 8407878A JP S5511225 A JPS5511225 A JP S5511225A
Authority
JP
Japan
Prior art keywords
outputs
output
toner
printing
photo detector
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
JP8407878A
Other languages
Japanese (ja)
Other versions
JPS619630B2 (en
Inventor
Kunitoshi Nishimura
Isao Fujimoto
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP8407878A priority Critical patent/JPS5511225A/en
Publication of JPS5511225A publication Critical patent/JPS5511225A/en
Publication of JPS619630B2 publication Critical patent/JPS619630B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Control Or Security For Electrophotography (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Dry Development In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)

Abstract

PURPOSE:To detect printing densities by separating the detection outputs of toner marks and portions other than these from photo detector outputs, dividing the outputs of the latter to the ratio of an allowable threshold level and ideal maximum output level and comparing these with the toner mark detection outputs. CONSTITUTION:This is the device of reflecting the light from a light emitting element 21 on a printing face 7, entering the same to a photo detector 22 and detecting printing densities from the increase and decrease thereof, whereby the output of the photo detector 22 is applied to input terminal 26. And the change component of the time when a toner mark 25 is detected is cut off with a low-pass filter 27. This output is divided to the ratio of an allowable threshold level and an ideal maximum output in the state where there are no stains, by a voltage dividing circuit 28 of resistances R1, R2. Comparison of these outputs and the detection output of the toner mark 25 is accomplished in a comparator 29, so that the judgement of the printing densities is pulse-generated. The pulse is then detected with a pulse generation monitor 30. Hence, the printing density detector stable to the decreased sensitivity owing to paper dust and floating toner may be obtained.
JP8407878A 1978-07-12 1978-07-12 Printing density detector Granted JPS5511225A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8407878A JPS5511225A (en) 1978-07-12 1978-07-12 Printing density detector

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8407878A JPS5511225A (en) 1978-07-12 1978-07-12 Printing density detector

Publications (2)

Publication Number Publication Date
JPS5511225A true JPS5511225A (en) 1980-01-26
JPS619630B2 JPS619630B2 (en) 1986-03-25

Family

ID=13820444

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8407878A Granted JPS5511225A (en) 1978-07-12 1978-07-12 Printing density detector

Country Status (1)

Country Link
JP (1) JPS5511225A (en)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5729487A (en) * 1980-07-29 1982-02-17 Fujitsu Ltd Decision of concentration of ribbon color
JPS57159664A (en) * 1981-03-27 1982-10-01 Fujitsu Ltd Automatic adjustment system of printing density
JPS57176075A (en) * 1980-12-22 1982-10-29 Ibm Method of sensing variation of light reflectivity
JPS5835550A (en) * 1981-08-28 1983-03-02 Fujitsu Ltd Toner density detection
JPS5865281U (en) * 1981-10-26 1983-05-02 三立化学株式会社 Appropriate amount discharge container
JPS5876832A (en) * 1981-11-02 1983-05-10 Konishiroku Photo Ind Co Ltd Metallic image forming material
JPS5879737U (en) * 1981-11-24 1983-05-30 日本電気株式会社 Print density control device
JPS63168459U (en) * 1987-08-20 1988-11-02
JPH02188360A (en) * 1989-01-10 1990-07-24 Nec Corp Paper jam detecting mechanism
JPH05312551A (en) * 1992-05-11 1993-11-22 Nippon Paper Ind Co Ltd Method for measuring impurities
US6914483B2 (en) 2002-02-28 2005-07-05 Fujitsu Limited High-frequency amplifier circuit

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62157895U (en) * 1986-03-28 1987-10-07

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026643A (en) * 1975-08-22 1977-05-31 Xerox Corporation Apparatus and method for measurement of the ratio of toner particle electrostatic charge to toner particle mass in electrostatographic devices

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4026643A (en) * 1975-08-22 1977-05-31 Xerox Corporation Apparatus and method for measurement of the ratio of toner particle electrostatic charge to toner particle mass in electrostatographic devices

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5729487A (en) * 1980-07-29 1982-02-17 Fujitsu Ltd Decision of concentration of ribbon color
JPH029948B2 (en) * 1980-07-29 1990-03-06 Fujitsu Ltd
JPH0128940B2 (en) * 1980-12-22 1989-06-06 Intaanashonaru Bijinesu Mashiinzu Corp
JPS57176075A (en) * 1980-12-22 1982-10-29 Ibm Method of sensing variation of light reflectivity
JPS57159664A (en) * 1981-03-27 1982-10-01 Fujitsu Ltd Automatic adjustment system of printing density
JPS5835550A (en) * 1981-08-28 1983-03-02 Fujitsu Ltd Toner density detection
JPS5865281U (en) * 1981-10-26 1983-05-02 三立化学株式会社 Appropriate amount discharge container
JPS5876832A (en) * 1981-11-02 1983-05-10 Konishiroku Photo Ind Co Ltd Metallic image forming material
JPS5879737U (en) * 1981-11-24 1983-05-30 日本電気株式会社 Print density control device
JPS63168459U (en) * 1987-08-20 1988-11-02
JPH0432689Y2 (en) * 1987-08-20 1992-08-06
JPH02188360A (en) * 1989-01-10 1990-07-24 Nec Corp Paper jam detecting mechanism
JPH05312551A (en) * 1992-05-11 1993-11-22 Nippon Paper Ind Co Ltd Method for measuring impurities
US6914483B2 (en) 2002-02-28 2005-07-05 Fujitsu Limited High-frequency amplifier circuit

Also Published As

Publication number Publication date
JPS619630B2 (en) 1986-03-25

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