JPS54130977A - Toner concentration measuring method and apparatus - Google Patents

Toner concentration measuring method and apparatus

Info

Publication number
JPS54130977A
JPS54130977A JP3840178A JP3840178A JPS54130977A JP S54130977 A JPS54130977 A JP S54130977A JP 3840178 A JP3840178 A JP 3840178A JP 3840178 A JP3840178 A JP 3840178A JP S54130977 A JPS54130977 A JP S54130977A
Authority
JP
Japan
Prior art keywords
toner
electrodes
lamp
toner concentration
energized
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
JP3840178A
Other languages
Japanese (ja)
Inventor
Kenta Watase
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 JP3840178A priority Critical patent/JPS54130977A/en
Publication of JPS54130977A publication Critical patent/JPS54130977A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0848—Arrangements for testing or measuring developer properties or quality, e.g. charge, size, flowability
    • G03G15/0849—Detection or control means for the developer concentration
    • G03G15/0855—Detection or control means for the developer concentration the concentration being measured by optical means

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

PURPOSE:To detect the toner concentration in a developing agent by attracting the toner with the use of an electric field, which is established by applying a voltage between electrodes, and by measuring the quantity of the toner caught by the electrodes. CONSTITUTION:A power source circuit 7 is energized to light a lamp 4, and the output of a photoelectric converting element 5 is stored in a calculating circuit 8 while the lamp 4 is being lit. Another power source circuit 6 is then energized to apply a vosltage between an electrode plate 2 and a transparent electrode 3 so that the toner floating in the vicinity of the same may be attracted by the electrodes 2 and 3. Then, the lamp 4 is lit again to feed the output of the element 5 to the device 8 so that the toner concentration is calculated and generated from the comparison with the value which has been stored in the previous trial.
JP3840178A 1978-04-01 1978-04-01 Toner concentration measuring method and apparatus Pending JPS54130977A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3840178A JPS54130977A (en) 1978-04-01 1978-04-01 Toner concentration measuring method and apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3840178A JPS54130977A (en) 1978-04-01 1978-04-01 Toner concentration measuring method and apparatus

Publications (1)

Publication Number Publication Date
JPS54130977A true JPS54130977A (en) 1979-10-11

Family

ID=12524262

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3840178A Pending JPS54130977A (en) 1978-04-01 1978-04-01 Toner concentration measuring method and apparatus

Country Status (1)

Country Link
JP (1) JPS54130977A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6774396B1 (en) * 1999-01-20 2004-08-10 Lg Philips Lcd Co., Ltd. Thin film transistor type optical sensor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6774396B1 (en) * 1999-01-20 2004-08-10 Lg Philips Lcd Co., Ltd. Thin film transistor type optical sensor
US6953978B2 (en) 1999-01-20 2005-10-11 Lg.Philips Lcd Co., Ltd. Thin film transistor type optical sensor

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