FR2363136A1 - METHOD AND DEVICE FOR PERFORMING THE INVERSION OF AN IMAGE - Google Patents

METHOD AND DEVICE FOR PERFORMING THE INVERSION OF AN IMAGE

Info

Publication number
FR2363136A1
FR2363136A1 FR7719671A FR7719671A FR2363136A1 FR 2363136 A1 FR2363136 A1 FR 2363136A1 FR 7719671 A FR7719671 A FR 7719671A FR 7719671 A FR7719671 A FR 7719671A FR 2363136 A1 FR2363136 A1 FR 2363136A1
Authority
FR
France
Prior art keywords
polarity
latent image
image
chamber
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
FR7719671A
Other languages
French (fr)
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.)
Coulter Information Systems Inc
Original Assignee
Coulter Information Systems 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 Coulter Information Systems Inc filed Critical Coulter Information Systems Inc
Publication of FR2363136A1 publication Critical patent/FR2363136A1/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
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer

Abstract

L'invention concerne un procédé et un dispositif pour effectuer l'inversion d'une image. Un révélateur liquide 30 est introduit dans une chambre 22 contenant une surface photo-conductrice 16 portant une image latente d'une pellicule electrophotographique 10, et une plaque métallique 20 parallèle et espacée définissant les deux limites de la chambre. Une forte polarisation continue 26 est appliquée à travers la chambre 22, dont la valeur et la polarité sont suffisantes pour élever les zones du fond de l'image latente à un fort potentiel de charge et réduire les zones très chargées restantes de l'image latente à zéro. La polarité des zones chargées de façon intermédiaire est inversée mais la grandeur relative de leur charge est maintenue. Le révélateur 30 utilisé a une polarité opposée à celle de la polarisation. Quand la révélation est terminée, la polarité est inversée pour entraîner les particules flottant dans le révélateur vers la plaque. L'image obtenue est l'inverse de l'image latente << originale >>. L'invention s'applique notamment à l'électrophotographie.The invention relates to a method and a device for performing the inversion of an image. A liquid developer 30 is introduced into a chamber 22 containing a photoconductive surface 16 bearing a latent image of an electrophotographic film 10, and a parallel and spaced metal plate 20 defining the two boundaries of the chamber. Strong DC bias 26 is applied through chamber 22, of sufficient magnitude and polarity to raise the background areas of the latent image to a high charge potential and reduce the remaining highly charged areas of the latent image. to zero. The polarity of the intermediate charged zones is reversed but the relative magnitude of their charge is maintained. The developer 30 used has a polarity opposite to that of the polarization. When the revealing is complete, the polarity is reversed to drive the particles floating in the developer towards the plate. The resulting image is the inverse of the "original" latent image. The invention applies in particular to electrophotography.

FR7719671A 1976-08-27 1977-06-27 METHOD AND DEVICE FOR PERFORMING THE INVERSION OF AN IMAGE Pending FR2363136A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US71817276A 1976-08-27 1976-08-27

Publications (1)

Publication Number Publication Date
FR2363136A1 true FR2363136A1 (en) 1978-03-24

Family

ID=24885099

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7719671A Pending FR2363136A1 (en) 1976-08-27 1977-06-27 METHOD AND DEVICE FOR PERFORMING THE INVERSION OF AN IMAGE

Country Status (8)

Country Link
JP (1) JPS5329131A (en)
BE (1) BE856137A (en)
CA (1) CA1109717A (en)
DE (1) DE2728882A1 (en)
FR (1) FR2363136A1 (en)
GB (1) GB1557100A (en)
IT (1) IT1079862B (en)
NL (1) NL7707117A (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888666A (en) * 1971-12-22 1975-06-10 Rank Xerox Ltd Reversal developing method using photoconductive developing electrode
FR2291529A1 (en) * 1974-11-13 1976-06-11 Coulter Information Systems METHOD AND DEVICE FOR REVEALING AN ELECTROPHOTOGRAPHIC FILM

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3888666A (en) * 1971-12-22 1975-06-10 Rank Xerox Ltd Reversal developing method using photoconductive developing electrode
FR2291529A1 (en) * 1974-11-13 1976-06-11 Coulter Information Systems METHOD AND DEVICE FOR REVEALING AN ELECTROPHOTOGRAPHIC FILM

Also Published As

Publication number Publication date
NL7707117A (en) 1978-03-01
BE856137A (en) 1977-12-27
JPS5329131A (en) 1978-03-18
CA1109717A (en) 1981-09-29
DE2728882A1 (en) 1978-03-02
GB1557100A (en) 1979-12-05
IT1079862B (en) 1985-05-13

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