US3912387A - Electrostatography - Google Patents

Electrostatography Download PDF

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Publication number
US3912387A
US3912387A US450269A US45026974A US3912387A US 3912387 A US3912387 A US 3912387A US 450269 A US450269 A US 450269A US 45026974 A US45026974 A US 45026974A US 3912387 A US3912387 A US 3912387A
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United States
Prior art keywords
plate
light
discharge
zones
discharging
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.)
Expired - Lifetime
Application number
US450269A
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English (en)
Inventor
Edric Raymond Brooke
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.)
Xerox Corp
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Xerox Corp
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Filing date
Publication date
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Priority to US05/558,758 priority Critical patent/US3994723A/en
Application granted granted Critical
Publication of US3912387A publication Critical patent/US3912387A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G03G15/04—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material
    • G03G15/045—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas
    • G03G15/047—Apparatus for electrographic processes using a charge pattern for exposing, i.e. imagewise exposure by optically projecting the original image on a photoconductive recording material with means for charging or discharging distinct portions of the charge pattern on the recording material, e.g. for contrast enhancement or discharging non-image areas for discharging non-image areas
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0434—Parameters defining the non-image area to be cleaned
    • G03G2215/0436—Document properties at the scanning position, e.g. position and density
    • G03G2215/0439—Automatic detection of properties
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0434—Parameters defining the non-image area to be cleaned
    • G03G2215/0443—Copy medium outline relative to the charge image
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0434—Parameters defining the non-image area to be cleaned
    • G03G2215/0446—Magnification degree
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0431—Producing a clean non-image area, i.e. avoiding show-around effects
    • G03G2215/0448—Charge-erasing means for the non-image area
    • 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
    • G03G2215/04—Arrangements for exposing and producing an image
    • G03G2215/0429—Changing or enhancing the image
    • G03G2215/0468—Image area information changed (default is the charge image)
    • G03G2215/047—Image corrections
    • G03G2215/0473—Image corrections due to document imperfections, e.g. punchholes, books

Definitions

  • FIG. 2 A COROTRON h v 20 C ELECTRONIC LOGIC I FIG. 2
  • ELECTROSTATOGRAPHY This invention relates to electrostatography and more particularly to improvements in the control of development in electrostatographic apparatus.
  • a moving photoconductive plate generally in the form ofan endless surface, such as a drum or the like, is first uniformly charged and the surface then exposed to a light pattern of the image sought to be reproduced thereby to discharge the charge in the areas where light strikes the plate.
  • the undischarged areas of the layeer thus form an electrostatic-charge pattern in conformity with the configuration of the original image pattern.
  • the electrostatic latent image may then be developed into visible form by applying a developer material, eg a powder, generally referred to as toner, to the plate using any one of a number of development means generally known and used in the art. Subsequent to the development operation, the now visible image is transferred from the plate to a sheet of final support material such as paper or the like and suitably affixed to it thereby forming a permanent print.
  • a developer material eg a powder, generally referred to as toner
  • the latent image may be developed using a liquid development system such as is described in US. Pat. No.
  • edge fadeout systems have been proposed for the purpose of avoiding or reducing wastage of developer material and ofeliminating or reducing solid marginal edge zones on copies.
  • illuminating means disposed in a rectangular frame surrounding the image area is energised to discharge the photoreceptor in the areas surrounding the image area.
  • a lamp extending transversely across the path of a photreceptor belt is activated by a suitable logic system a short predetermined time after de-energisation of the flash exposure lamps.
  • the present invention provides an electrostatographic process including the steps of a. applying a uniform electrostatic charge to a photoconductive plate,
  • the invention provides, in or for an electrostatographic apparatus including a photoconductive plate, means for applying a uniform electrostatic charge to the plate, exposure means for exposing the charged plate to a pattern of light and shadow to produce an electrostatic latent image on the plate, and developer means for developing charged areas of the plate; means for detecting continuous zones of the plate which do not receive sufficient light from said exposure means during exposure of the plate to discharge the plate and discharge means controlled by said detecting means for discharging the plate in said zones.
  • said detecting means comprises one or more light sensitive detectors arranged in the optical path of the exposure means.
  • the discharge means may comprise one or more discharge lamps extending transversely across the plate.
  • detecting means sensitive to light is provided in the light path defined by the exposure means and one or more discharge devices, suitably lamps, are operated as a function of the intensity of light received by said detecting means. This may be achieved by determining the intensity of light required to reduce the plate charge to a value such that developer material will not be attracted thereto and providing that the detecting means will cause the discharge device(s) to be activated only when the detecting means receives light of less than such intensity (including no light).
  • the discharge system of this invention may operate only to discharge predetermined zones of a photoconductive plate.
  • a discharge device in the form of a single lamp, or a row of lamps connected to operate in unison may be arranged transversely across the plate and a plurality of light-sensitive detectors may be provided transversely across the plate, operation of the discharge device only being effected where all detectors receive less than a predetermined intensity of light.
  • Such an arrangement would permit the discharge of solid or continuous charge zones at opposite ends, in the direction of movement of the plate, of the desired image area whilst enabling solid area development to be achieved within the desired image area.
  • the discharge device could be split into three or more sections, each operated by one, or preferably a transversely extending series of, detectors.
  • the lengths of such sections would be chosen according to known parameters such as paper size, document size or reduction mode;
  • a row of lamps extends transversely across the plate and a detector is associated with each lamp. Whilst in some circumstances the above arrangement will result in the elimination of desired solid or continuous charge areas within the image area, manual means could be provided for switching out the discharge means in these circumstances.
  • the present invention will perform the same functions as are achieved by the known devices described above, it provides the significant advantage of enabling the elimination of solid development areas which cannot or have not been predetermined in terms of machine function.
  • a lamp means is controlled by a plurality of detectors spaced across the plate
  • the elimination of continuous charge zones at opposite ends of the image area is effected regardless of their length in the direction of plate movement and without control by any other machine function.
  • FIG. 1 is a schematic view of one form of document scanning system for an electrostatographic machine
  • FIG. 2 is a schematic view of one embodiment of development control system according to the invention.
  • FIG. 3 is a view illustrating the embodiment of FIG. 2 taken along the line AA of FIG. 1,
  • FIG. 4 is a view of a unitary mounting arrangement for the embodiment of FIG. 2,
  • FIG. 5 is an illustration of a suitable electronic con trol circuit
  • FIG. 6 is a representation of a document to be copied for the purpose of explaining modes of operation of development control systems of this invention
  • FIG. 7 is a view like that of FIG. 3 of a second embodiment of the invention.
  • FIG. 8 is a view like that of FIG. 3 of a third embodiment of the invention.
  • a platen 10 is provided to support the document 11 to be copied.
  • a scanning mirror system includes two moveable mirrors 12 and 13 shown in their extreme left and right positions in full and dotted outline respectively. The mirror 13 is arranged to move at half the speed of the mirror 11 during scanning to maintain the optical distance constant between the document 11 and a lens 14.
  • a tubular lamp 15 extending across the platen 10 parallel to the mirror 12 moves with the mirror 12 in fixed relation thereto. The lamp 15 is provided as illumination means to illuminate the document 11 through the platen 10 during scanning.
  • An optical or light path extending from the platen 10 to the lens 14 continues beyond the lens to be reflected in sequence by mirrors l6 and 17 towards a photoreceptor drum 18.
  • An optical slit 19, better seen in FIG. 3, is provided in a cover plate 20.
  • a platen cover 22 is provided over the platen so that it will lie on the document 11.
  • the configuration or shape of the slit 19 is, as shown, narrower at its mid-point than at its extremities. This shape, as is already known in the art, is to compensate for the non-uniformity of light output from the lamp across its length.
  • the document 11 is scanned by the sweep of the mirrors from left to right producing a latent image of the information on the document on the photoreceptor 18 which rotates in synchronism with the movement of the mirrors 12 and 13 in the direction of arrow 23.
  • the underside of the platen cover has a reflective surface, light striking the platen cover beyond the edges of the document will be reflected along the optical path.
  • a xerographic machine incorporating such a scanning system is also provided with charging, development and transfer stations C, D and T arranged in the relative locations indicated.
  • a liquid development system is employed, being represented schematically by an applicator roll of such a system, but it should be appreciated that in the case of a powder or particulate development system a fusing station should be provided following the transfer station for securing the toner particles to the copy material S in a permanent form.
  • the drum surface which comprises a layer of photoconductive insulating material which may, for example, be vitreous selenium supported on a conductive backing such as aluminium, is sensitised by means of a corona generating device at the charging station C, which is energised from a suitable high potential source (not shown).
  • a corona generating device may be an adaption of the type disclosed in US. Pat. No. 2,965,756.
  • Exposure of the drum to the light image discharges the photoconductive layer in the areas struck by light, whereby there remains on the drum a latent electrostatic image in image configuration corresponding to the light image projected from the document.
  • the electrostatic latent image passes through the developer station D at which, in this machine configuration, a liquid developer material is "applied to the drum to produce a visible image thereon.
  • the visible image passes through theimage transfer station T at which the visible image is transferred toa 'sheetof copy paper, which is fed into contact with'the rotating drum in coordinated registration with thearrival of the developed image at the transfer station.
  • a suitable pick-off m echanism' (not illustrated) separates the copy sheet from the drum surface whereafter the copy sheet is directed into a suitable copy-holder for removal by an operator.
  • the xerographic drum surface passes through a cleaning station (not illustrated) at which the surface is cleaned suitably by a doctor blade arranged in contact; with the drum for doctoring the developer .material remaining on the drum surface.
  • the exposure slit 19 is narrower than the optical path so that the rays having imaged on the drum at Xpass on to a row of photo diodes 31 extending transverselyacross the drum.
  • Each photo diode is associated witha lamp 32controlled as a function of the intensity pf lightimpinging on the photodiode by a suitable electronic logic system'L in'the following manner;
  • a predetermined intensity sufficient to reduce the charge on the plate to a value such that developer material will not be attracted thereto
  • the corresponding lamp is ment lamps will have their own delay characteristic which may provide the required time delay.
  • the lamps may be maintained lit at a low level of intensity insufficient to discharge the drum area therebeneath in the manner described in British patent specification No. 1,230,526.
  • FIG. 4 shows a convenient mounting arrangment for the development control system described above in which the detector/lamp sub-units are mounted in an elongate unit extending across the width of the drum 6 and which also includes the necessary control circuitry, a simplified form of which for a single subunit is illustrated in FIG. 5.
  • the operation isas follows. When less than the predetermined threshold intensity of light is falling on the photocell 31 it has an effective high resistwice and the voltage across resistor R1 is applied to 'the'emitter of transistor 34 and current flows through the lamp 32. When the photocell receives light above the threshold intensity its resistance drops causing the voltagea'cr'oss Rl to drop sufficiently to cause the lamp current to'drop and extinguish the lamp.
  • each lamp As shown in FIG. 4, the circuits associated with each lamp are all'c'onnected to bus-bars 35 leading to a common supply.
  • each sub-unit is separated by a light shield or baffle 33 and the complete unit may be incapsulated in a transparent resin.
  • This embodiment has particular application to the elimination of unwanted solid area development of marginal edges zones of a copy sheet which would otherwise occur where the document to be copied is small compared with the glass platen size and either the platen cover is raised or the document has a substantial thickness (e.g. it may be a book) so preventing the platen cover from coming close to the platen.
  • light from the lamp 15 which passes through the platen in the areas surrounding the document 11 will not be reflected down the optical path and the corresponding areas of the drum surface will not be discharged during exposure.
  • the development control systemdescribed above will operate as follows. Until the image of the document edge X X reaches the photodiodes 31, all lamps 32 will be lit and the drum will be discharged.
  • edge X,X reflects light the lamps will be extinguished across the portion of the drum between X and X and an electrostatic latent image of the vdocument information will be produced on the drum surface.
  • edge X,X reflects light the lamps will be extinguished across the portion of the drum between X and X and an electrostatic latent image of the vdocument information will be produced on the drum surface.
  • the Y Y edge passes the exposure slit 19 no further light will reach the photodiodes 31 and all they lamps 32 will again be lit, discharging the remaining area of the drum.
  • the pitch of the photocells 31 and the lamps 32 will determine the sharpness of the X Y, and X Y edges. In the above description of operation it is presupposed that the document contains only line information and no substantial solid dark areas.
  • FIGS. 7 and 8 Further embodiments of the invention are schematically illustrated in FIGS. 7 and 8.
  • a single tubular lamp 32 is arranged transversely across the drum surface and a row of photocells 31 extend in a row across the drum.
  • the photocells 31 are so connected to the lamp 32 that the lamp will only be lit when all the photocells receive less than the pre-set threshold intensity of light.
  • the lamp 32 is split into three sections 32a, 32b and 320, each associated with its own series of photocells 31. Beyond the edges corresponding to X X and Y Y of FIG. 6, all three lamps will be lit but between X X and Y Y only the outer lamps 32a and 320 which are of a length corresponding to predetermined marginal zones of the drum, will be lit.
  • the photocells could be arranged across the drum at position A indicated in FIG. 2 so as to receive advance information of the intensity of light about to fall on the drum.
  • an electrostatographic apparatus including a photoconductive plate, means for applying a uniform electrostatic charge to the plate, exposure means for exposing the charged plate to a pattern of light and shadow to produce an electrostatic latent image on the plate, and developer means for developing charged areas of the plate;
  • detecting means comprising one or more light sensitive devices arranged in the optical path of the exposure means for detecting continuous zones of the plate which do not receive sufficient light from said exposure means during exposure of the plate to discharge the plate;
  • said discharge means comprises one or more discharge lamps extending transversely across the plate.
  • an electrostatographic apparatus including an electrostatographic plate, means for applying a uniform electrostatic charge to the plate, and means for discharging selected portions of the charged plate to produce an electrostatic latent image on the plate;
  • sensing means adapted for detecting continuous zones of the plate which are not discharged by said means for discharging selected portions of the plate;
  • discharging means controlled by said sensing means for discharging the plate in said continuous zones.
  • Electrostatographic apparatus in which, in operation, successive portions of a document to be reproduced are exposed through a slit on to a relatively moving photoconductive plate.
  • An electrostatographic process including the steps of a. applying a uniform electrostatic charge to a photoconductive plate,

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Facsimile Scanning Arrangements (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
US450269A 1973-03-30 1974-03-11 Electrostatography Expired - Lifetime US3912387A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US05/558,758 US3994723A (en) 1974-03-11 1975-03-17 Electrophotograhic process involving steps of subsequent discharge of areas receiving insufficient exposure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1556473A GB1416062A (en) 1973-03-30 1973-03-30 Electrostatography

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US05/558,758 Division US3994723A (en) 1974-03-11 1975-03-17 Electrophotograhic process involving steps of subsequent discharge of areas receiving insufficient exposure

Publications (1)

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US3912387A true US3912387A (en) 1975-10-14

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US450269A Expired - Lifetime US3912387A (en) 1973-03-30 1974-03-11 Electrostatography

Country Status (6)

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US (1) US3912387A (enrdf_load_stackoverflow)
JP (1) JPS5030538A (enrdf_load_stackoverflow)
CA (1) CA1037100A (enrdf_load_stackoverflow)
DE (1) DE2415390C3 (enrdf_load_stackoverflow)
FR (1) FR2223734B1 (enrdf_load_stackoverflow)
GB (1) GB1416062A (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046471A (en) * 1975-11-03 1977-09-06 International Business Machines Corporation Dual mode electrophotographic apparatus having dual function printing beam
US4057342A (en) * 1976-05-27 1977-11-08 Xerox Corporation Illumination slit for a reproducing machine
US4105320A (en) * 1977-01-05 1978-08-08 Xerox Corporation Transfer of conductive particles
DE2843975A1 (de) * 1977-10-08 1979-04-19 Canon Kk Kopiergeraet mit wahlweise einstellbarer vorlagengrundlinie
US4255042A (en) * 1979-03-26 1981-03-10 International Business Machines Corporation Light pipe for accurate erasure of photoconductor charge
US4405224A (en) * 1979-11-22 1983-09-20 Olympus Optical Company Limited Electrophotographic apparatus having means for removing undesired charge concentrated on an edge portion of a photosensitive member
DE3336961A1 (de) * 1982-10-12 1984-04-12 Canon K.K., Tokyo Bildreproduktionseinrichtung
JPS60182540U (ja) * 1984-05-14 1985-12-04 カヤバ工業株式会社 油圧緩衝器
US4564286A (en) * 1983-06-09 1986-01-14 Xerox Corporation Illumination device
US4743944A (en) * 1984-06-21 1988-05-10 Canon Kabushiki Kaisha Image processing apparatus with variable magnification
US4791494A (en) * 1979-02-23 1988-12-13 Savin Corporation Multiple variable light source printer
US4811047A (en) * 1983-08-25 1989-03-07 Canon Kabushiki Kaisha Image forming apparatus with means for recognizing an original condition
US4814815A (en) * 1986-02-28 1989-03-21 Mita Industrial Co., Ltd. Image generating device having a reflecting plate for eliminating charge on a portion of the photoreceptor of an electrophotographic copying machine
US4839696A (en) * 1986-02-28 1989-06-13 Canon Kabushiki Kaisha Image recording apparatus for recording a selected portion of an original image
US5072259A (en) * 1982-11-20 1991-12-10 Canon Kabushiki Kaisha Image forming apparatus having magnification capabilities with charge removal outside image area

Families Citing this family (19)

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NL7507493A (nl) * 1975-06-24 1976-12-28 Oce Van Der Grinten Nv Kopieerinrichting.
JPS5281267A (en) * 1975-12-25 1977-07-07 Chubu Shiriyou Kk Process for producing pellet
IT1055822B (it) * 1976-01-20 1982-01-11 Olivetti E C Spa Macchina copiatrice elettrofotografica
JPS5335527U (enrdf_load_stackoverflow) * 1976-09-01 1978-03-29
JPS53129639A (en) * 1977-04-19 1978-11-11 Mita Industrial Co Ltd Method of and device for electrostatic copying
JPS5491239A (en) * 1977-12-28 1979-07-19 Konishiroku Photo Ind Co Ltd Destaticizer of electrophotographic copier
JPS5494038A (en) * 1978-01-07 1979-07-25 Ricoh Co Ltd Copier for zerography
JPS5529950A (en) * 1978-08-24 1980-03-03 Nisshin Oil Mills Ltd:The Solid feed
JPS55138754A (en) * 1979-04-18 1980-10-29 Ricoh Co Ltd Original pattern detection control system of electrophotographic copier
US4474453A (en) * 1979-04-18 1984-10-02 Ricoh Company, Ltd. Electrostatic copying apparatus
JPS5613914A (en) * 1979-07-13 1981-02-10 Nitsutoo Seisakusho Kk Counter for unit type reception desk
JPS5993469A (ja) * 1982-11-18 1984-05-29 Matsushita Electric Ind Co Ltd 電子写真装置
JPS5993440A (ja) * 1982-11-18 1984-05-29 Matsushita Electric Ind Co Ltd 電子写真装置
DE3442028A1 (de) * 1983-11-17 1985-05-30 Canon K.K., Tokio/Tokyo Geraet zur erzeugung von abbildungen von positiv- und negativ-originalen
US4655580A (en) * 1984-11-06 1987-04-07 Kabushiki Kaisha Toshiba Image forming apparatus with image forming area selection
JPS6236681A (ja) * 1985-08-12 1987-02-17 Toshiba Corp 画像形成装置
JPS62143066A (ja) * 1985-12-17 1987-06-26 Fuji Xerox Co Ltd 電子写真式複写機
JPS62248459A (ja) * 1986-04-23 1987-10-29 Shiraishi Calcium Kk ペレツト伏ミネラル混合飼料
JPS62248460A (ja) * 1986-04-23 1987-10-29 Shiraishi Calcium Kk ペレット状ミネラル混合飼料

Citations (1)

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US3612682A (en) * 1968-06-07 1971-10-12 Addressograph Multigraph Copier-duplicator machine providing for photoelectrostatic master from which copies are made

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GB1248945A (en) * 1967-12-26 1971-10-06 Rank Xerox Ltd Electrophotography
JPS5018394B1 (enrdf_load_stackoverflow) * 1970-01-10 1975-06-28
US3860338A (en) * 1973-01-15 1975-01-14 Xerox Corp Adjustable fadeout control

Patent Citations (1)

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Publication number Priority date Publication date Assignee Title
US3612682A (en) * 1968-06-07 1971-10-12 Addressograph Multigraph Copier-duplicator machine providing for photoelectrostatic master from which copies are made

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4046471A (en) * 1975-11-03 1977-09-06 International Business Machines Corporation Dual mode electrophotographic apparatus having dual function printing beam
US4057342A (en) * 1976-05-27 1977-11-08 Xerox Corporation Illumination slit for a reproducing machine
DE2723677A1 (de) * 1976-05-27 1977-12-08 Xerox Corp Belichtungsschlitz fuer eine reproduktionsmaschine
US4105320A (en) * 1977-01-05 1978-08-08 Xerox Corporation Transfer of conductive particles
DE2843975A1 (de) * 1977-10-08 1979-04-19 Canon Kk Kopiergeraet mit wahlweise einstellbarer vorlagengrundlinie
US4791494A (en) * 1979-02-23 1988-12-13 Savin Corporation Multiple variable light source printer
US4255042A (en) * 1979-03-26 1981-03-10 International Business Machines Corporation Light pipe for accurate erasure of photoconductor charge
US4405224A (en) * 1979-11-22 1983-09-20 Olympus Optical Company Limited Electrophotographic apparatus having means for removing undesired charge concentrated on an edge portion of a photosensitive member
DE3336961A1 (de) * 1982-10-12 1984-04-12 Canon K.K., Tokyo Bildreproduktionseinrichtung
US4620781A (en) * 1982-10-12 1986-11-04 Canon Kabushiki Kaisha Image processing apparatus for detecting size of the original
US5072259A (en) * 1982-11-20 1991-12-10 Canon Kabushiki Kaisha Image forming apparatus having magnification capabilities with charge removal outside image area
US4564286A (en) * 1983-06-09 1986-01-14 Xerox Corporation Illumination device
US4811047A (en) * 1983-08-25 1989-03-07 Canon Kabushiki Kaisha Image forming apparatus with means for recognizing an original condition
JPS60182540U (ja) * 1984-05-14 1985-12-04 カヤバ工業株式会社 油圧緩衝器
US4743944A (en) * 1984-06-21 1988-05-10 Canon Kabushiki Kaisha Image processing apparatus with variable magnification
US4814815A (en) * 1986-02-28 1989-03-21 Mita Industrial Co., Ltd. Image generating device having a reflecting plate for eliminating charge on a portion of the photoreceptor of an electrophotographic copying machine
US4839696A (en) * 1986-02-28 1989-06-13 Canon Kabushiki Kaisha Image recording apparatus for recording a selected portion of an original image

Also Published As

Publication number Publication date
FR2223734A1 (enrdf_load_stackoverflow) 1974-10-25
DE2415390C3 (de) 1981-06-25
JPS5030538A (enrdf_load_stackoverflow) 1975-03-26
DE2415390B2 (de) 1980-10-30
GB1416062A (en) 1975-12-03
FR2223734B1 (enrdf_load_stackoverflow) 1977-03-04
CA1037100A (en) 1978-08-22
DE2415390A1 (de) 1974-10-10

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