EP1197807A3 - Densitometer diagnostic system for an image forming apparatus - Google Patents

Densitometer diagnostic system for an image forming apparatus Download PDF

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Publication number
EP1197807A3
EP1197807A3 EP01123361A EP01123361A EP1197807A3 EP 1197807 A3 EP1197807 A3 EP 1197807A3 EP 01123361 A EP01123361 A EP 01123361A EP 01123361 A EP01123361 A EP 01123361A EP 1197807 A3 EP1197807 A3 EP 1197807A3
Authority
EP
European Patent Office
Prior art keywords
densitometer
diagnostic
image forming
forming apparatus
circuit
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.)
Withdrawn
Application number
EP01123361A
Other languages
German (de)
French (fr)
Other versions
EP1197807A2 (en
Inventor
James D. Anthony
William A. Hameister
Kenneth M. Patterson
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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 Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP1197807A2 publication Critical patent/EP1197807A2/en
Publication of EP1197807A3 publication Critical patent/EP1197807A3/en
Withdrawn legal-status Critical Current

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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
    • G03G15/50—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control
    • G03G15/5033—Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control by measuring the photoconductor characteristics, e.g. temperature, or the characteristics of an image on the photoconductor
    • G03G15/5041—Detecting a toner image, e.g. density, toner coverage, using a test patch
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00025—Machine control, e.g. regulating different parts of the machine
    • G03G2215/00029—Image density detection
    • G03G2215/00033—Image density detection on recording member
    • G03G2215/00037—Toner image detection
    • G03G2215/00042—Optical detection

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

Die Erfindung stellt ein Diagnosesystem für ein Densitometer in einem Bilderzeugungsgerät bereit. Ein Bilderzeugungsgerät mit einem Densitometer-Diagnosesystem kann ein Fotoleiterelement, eine oder mehrere Ladestationen, eine Belichtungsstation, eine Tonerstation und ein Densitometer aufweisen. Ein Densitometer-Diagnosesystem für ein Bilderzeugungsgerät kann einen Sender, einen Empfänger, eine Verstärker-Schaltung und eine Diagnose-Schaltung aufweisen. Die Diagnose-Schaltung verringert den Ansteuerungsstrom zum Sender im Densitometer um einen bekannten oder berechenbaren Wert. Die Ausgabespannung von der Verstärker-Schaltung im Densitometer wird proportional zur Verringerung des Ansteuerungsstroms abgesenkt. Zum Durchführen einer Diagnoseprüfung des Densitometers wird eine erste Ausgabespannung vom Densitometer ohne angeschlossene Diagnose-Schaltung ermittelt. Eine zweite Ausgabespannung wird vom Densitometer mit angeschlossener Diagnose-Schaltung ermittelt. Wenn die Differenz zwischen der ersten und der zweiten Ausgabespannung einer Spannungs-Spezifikation entspricht, ist das Densitometer funktionsfähig. Die Diagnose-Schaltung kann aus dem Densitometer entfernt werden, wenn dieses nicht in Gebrauch ist. Alternativ kann das Densitometer einen Schalter zum Abschalten der Diagnose-Schaltung aufweisen, wenn diese nicht in Verwendung ist.

Figure 00000001
The invention provides a diagnostic system for a densitometer in an image forming apparatus. An image forming apparatus having a densitometer diagnostic system may include a photoconductor element, one or more charging stations, an exposure station, a toning station, and a densitometer. A densitometer diagnostic system for an imaging device may include a transmitter, a receiver, an amplifier circuit, and a diagnostic circuit. The diagnostic circuit reduces the drive current to the transmitter in the densitometer by a known or calculable value. The output voltage from the amplifier circuit in the densitometer is lowered in proportion to the reduction of the drive current. To perform a diagnostic test of the densitometer, a first output voltage is determined by the densitometer without the diagnostic circuit connected. A second output voltage is determined by the densitometer with connected diagnostic circuit. If the difference between the first and second output voltages equals a voltage specification, the densitometer is functional. The diagnostic circuit can be removed from the densitometer when not in use. Alternatively, the densitometer may include a switch for turning off the diagnostic circuit when not in use.
Figure 00000001
EP01123361A 2000-10-13 2001-10-10 Densitometer diagnostic system for an image forming apparatus Withdrawn EP1197807A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US687647 1984-12-31
US09/687,647 US6385411B1 (en) 2000-10-13 2000-10-13 Densitometer diagnostic system for an image-forming machine

Publications (2)

Publication Number Publication Date
EP1197807A2 EP1197807A2 (en) 2002-04-17
EP1197807A3 true EP1197807A3 (en) 2005-10-12

Family

ID=24761239

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01123361A Withdrawn EP1197807A3 (en) 2000-10-13 2001-10-10 Densitometer diagnostic system for an image forming apparatus

Country Status (5)

Country Link
US (1) US6385411B1 (en)
EP (1) EP1197807A3 (en)
JP (1) JP4027067B2 (en)
CA (1) CA2358616C (en)
DE (1) DE10149966A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6567171B1 (en) 2000-04-03 2003-05-20 Rushing Allen J Digital densitometer with controlled light emitter
US6813128B2 (en) * 2001-05-25 2004-11-02 Nexpress Solutions Llc High voltage bias feedback for diagnostic purposes
US8139981B2 (en) * 2008-01-22 2012-03-20 Eastman Kodak Company Spring-loaded web cleaning apparatus for electrographic printer

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553033A (en) * 1983-08-24 1985-11-12 Xerox Corporation Infrared reflectance densitometer
EP0482866A2 (en) * 1990-10-24 1992-04-29 Xerox Corporation Densitometer and circuitry for measuring marking particle density on a photoreceptor
EP0505079A1 (en) * 1991-03-13 1992-09-23 Minnesota Mining And Manufacturing Company Auto-ranging film densitometer
US5574544A (en) * 1994-08-29 1996-11-12 Konica Corporation Image forming apparatus having image density gradation correction means
US5773827A (en) * 1996-12-16 1998-06-30 Xerox Corporation Xerographic infrared reflectance densitometer (IRD) sensor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5678132A (en) * 1994-04-26 1997-10-14 Canon Kabushiki Kaisha Image density detection adjustment device
US5903800A (en) 1998-06-04 1999-05-11 Eastman Kodak Company Electrostatographic reproduction apparatus and method with improved densitometer
US6229972B1 (en) * 2000-04-03 2001-05-08 Allen J. Rushing Digital densitometer with calibration and statistics

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4553033A (en) * 1983-08-24 1985-11-12 Xerox Corporation Infrared reflectance densitometer
EP0482866A2 (en) * 1990-10-24 1992-04-29 Xerox Corporation Densitometer and circuitry for measuring marking particle density on a photoreceptor
EP0505079A1 (en) * 1991-03-13 1992-09-23 Minnesota Mining And Manufacturing Company Auto-ranging film densitometer
US5574544A (en) * 1994-08-29 1996-11-12 Konica Corporation Image forming apparatus having image density gradation correction means
US5773827A (en) * 1996-12-16 1998-06-30 Xerox Corporation Xerographic infrared reflectance densitometer (IRD) sensor

Also Published As

Publication number Publication date
JP4027067B2 (en) 2007-12-26
EP1197807A2 (en) 2002-04-17
CA2358616C (en) 2004-07-27
DE10149966A1 (en) 2002-04-18
JP2002132096A (en) 2002-05-09
CA2358616A1 (en) 2002-04-13
US6385411B1 (en) 2002-05-07

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