JPS649481A - Image reader - Google Patents

Image reader

Info

Publication number
JPS649481A
JPS649481A JP16229587A JP16229587A JPS649481A JP S649481 A JPS649481 A JP S649481A JP 16229587 A JP16229587 A JP 16229587A JP 16229587 A JP16229587 A JP 16229587A JP S649481 A JPS649481 A JP S649481A
Authority
JP
Japan
Prior art keywords
toner
reference value
state
image
signal vsp
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
JP16229587A
Other languages
Japanese (ja)
Inventor
Yuji Sawai
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 JP16229587A priority Critical patent/JPS649481A/en
Publication of JPS649481A publication Critical patent/JPS649481A/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

Abstract

PURPOSE:To always keep image density in a proper state by constituting a device in such a way that the signal of a toner state detection means is compared with a previously set control reference value so as to drive a toner supply means. CONSTITUTION:A photosensor 14 provided on a position where the image- formation area of a reference pattern plate 13 on the bottom surface of an original platen 12 passes detects the reflected light of the developed image on the pattern plate 13 and outputs a detection signal Vsp. Control reference values K1 and K2 which are the reference of the toner state are previously stored in control part 16 and while the signal Vsp does not fulfill the reference value K1, the supply of the toner by a supplying roller 7 is not needed because sufficient toner adheres to a detection pattern. When the signal Vsp exceeds the reference value K2, the toner is supplied with the driving of a driving device 15. Then, the image density can be always kept in the proper state.
JP16229587A 1987-07-01 1987-07-01 Image reader Pending JPS649481A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16229587A JPS649481A (en) 1987-07-01 1987-07-01 Image reader

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16229587A JPS649481A (en) 1987-07-01 1987-07-01 Image reader

Publications (1)

Publication Number Publication Date
JPS649481A true JPS649481A (en) 1989-01-12

Family

ID=15751777

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16229587A Pending JPS649481A (en) 1987-07-01 1987-07-01 Image reader

Country Status (1)

Country Link
JP (1) JPS649481A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519271A (en) * 1991-04-30 1996-05-21 Sankyo Seiki Mfg. Co., Ltd. Stator of rotating electric machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5519271A (en) * 1991-04-30 1996-05-21 Sankyo Seiki Mfg. Co., Ltd. Stator of rotating electric machine

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