JPS54161941A - Toner concentration detecting method in electrophotographic copier - Google Patents

Toner concentration detecting method in electrophotographic copier

Info

Publication number
JPS54161941A
JPS54161941A JP6993078A JP6993078A JPS54161941A JP S54161941 A JPS54161941 A JP S54161941A JP 6993078 A JP6993078 A JP 6993078A JP 6993078 A JP6993078 A JP 6993078A JP S54161941 A JPS54161941 A JP S54161941A
Authority
JP
Japan
Prior art keywords
toner concentration
light
curve
station
developer
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
JP6993078A
Other languages
Japanese (ja)
Inventor
Hisao Fujita
Kiyoshi Kimura
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.)
Konica Minolta Inc
Original Assignee
Konica Minolta Inc
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 Konica Minolta Inc filed Critical Konica Minolta Inc
Priority to JP6993078A priority Critical patent/JPS54161941A/en
Priority to US06/045,759 priority patent/US4273843A/en
Priority to DE2923806A priority patent/DE2923806C2/en
Publication of JPS54161941A publication Critical patent/JPS54161941A/en
Pending legal-status Critical Current

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  • Dry Development In Electrophotography (AREA)

Abstract

PURPOSE:To enable accurate toner concentration control, by limiting the wavelength region of the light to be received reflected from a developer to steepen change of reflection light intensity against toner concentration. CONSTITUTION:Developer d is irradiated with light from light emitting station 3b through transparent plate 3a arranged in the bottom of developer tank 21, and the reflected light is received with photodetector 3c. When filter 3d intercepting the wavelength region of 700 to 1200 nm is fixed on the light path between photodetector 3 and station 3b using an incandescent lamp in station 3b, the obtained reflection light intensity curve becomes by far steeper, such as curve b than the curve conventionally obtained without any filter, such as curve a, and even when set reflection intensity R2 varies by apparent width r2, the variation width of toner concentration falls to d2, and deviation from correct toner concentration D becomes comparatively smaller, thus permitting accurate concentration control to be carried out.
JP6993078A 1978-06-12 1978-06-12 Toner concentration detecting method in electrophotographic copier Pending JPS54161941A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP6993078A JPS54161941A (en) 1978-06-12 1978-06-12 Toner concentration detecting method in electrophotographic copier
US06/045,759 US4273843A (en) 1978-06-12 1979-06-05 Method of detecting toner concentration in electrophotographic copying machine
DE2923806A DE2923806C2 (en) 1978-06-12 1979-06-12 Device for determining the toner concentration in electrophotographic copiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6993078A JPS54161941A (en) 1978-06-12 1978-06-12 Toner concentration detecting method in electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS54161941A true JPS54161941A (en) 1979-12-22

Family

ID=13416878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6993078A Pending JPS54161941A (en) 1978-06-12 1978-06-12 Toner concentration detecting method in electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS54161941A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63177172A (en) * 1987-01-19 1988-07-21 Canon Inc Developing device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53107853A (en) * 1977-03-02 1978-09-20 Canon Inc Concentration detection method of developer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53107853A (en) * 1977-03-02 1978-09-20 Canon Inc Concentration detection method of developer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63177172A (en) * 1987-01-19 1988-07-21 Canon Inc Developing device

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