EP0774698B1 - Dispositif de formation d'image avec exposition à travers un support d'image en forme de bande - Google Patents

Dispositif de formation d'image avec exposition à travers un support d'image en forme de bande Download PDF

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Publication number
EP0774698B1
EP0774698B1 EP97100597A EP97100597A EP0774698B1 EP 0774698 B1 EP0774698 B1 EP 0774698B1 EP 97100597 A EP97100597 A EP 97100597A EP 97100597 A EP97100597 A EP 97100597A EP 0774698 B1 EP0774698 B1 EP 0774698B1
Authority
EP
European Patent Office
Prior art keywords
radiation
image member
image
exposure
lens support
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
EP97100597A
Other languages
German (de)
English (en)
Other versions
EP0774698A3 (fr
EP0774698A2 (fr
Inventor
Joseph Edward Eastman Kodak Company Guth
W. Charles Eastman Kodak Company Kasiske
Eric Carl Eastman Kodak Company Stelter
Yee Seung Eastman Kodak Company Ng
Frank Joseph Eastman Kodak Company Koetter
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.)
NexPress Solutions LLC
Original Assignee
NexPress Solutions LLC
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
Priority claimed from US08/065,248 external-priority patent/US5485190A/en
Priority claimed from US08/065,246 external-priority patent/US5985499A/en
Application filed by NexPress Solutions LLC filed Critical NexPress Solutions LLC
Publication of EP0774698A2 publication Critical patent/EP0774698A2/fr
Publication of EP0774698A3 publication Critical patent/EP0774698A3/fr
Application granted granted Critical
Publication of EP0774698B1 publication Critical patent/EP0774698B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/32—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head
    • G03G15/326—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is formed dotwise, e.g. by a thermal head by application of light, e.g. using a LED array
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
    • B41J2/447—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources
    • B41J2/45—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using arrays of radiation sources using light-emitting diode [LED] or laser arrays
    • 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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
    • G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
    • G03G15/0157—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member with special treatment between monocolour image formation
    • 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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines
    • G03G15/0147—Structure of complete machines using a single reusable electrographic recording member
    • G03G15/0152—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member
    • G03G15/0163—Structure of complete machines using a single reusable electrographic recording member onto which the monocolour toner images are superposed before common transfer from the recording member primary transfer to the final recording medium
    • 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
    • G03G15/04036—Details of illuminating systems, e.g. lamps, reflectors
    • G03G15/04045—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers
    • G03G15/04054—Details of illuminating systems, e.g. lamps, reflectors for exposing image information provided otherwise than by directly projecting the original image onto the photoconductive recording material, e.g. digital copiers by LED arrays
    • 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
    • G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
    • G03G2215/0167—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member
    • G03G2215/017—Apparatus for electrophotographic processes for producing multicoloured copies single electrographic recording member single rotation of recording member to produce multicoloured copy
    • 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
    • G03G2215/0497—Exposure from behind the image carrying surface

Definitions

  • This invention relates to the formation of two or more toner images in a single frame or area of an image member. Although not limited thereto, it is particularly usable in an apparatus which forms accent color images on a single frame of an image member in a single pass.
  • US-A-5,001,028 is representative of a number of references describing a process in which a photoconductive image member is uniformly charged and imagewise exposed to create an electrostatic image.
  • Toner is applied to the electrostatic image to create a toner image.
  • discharged area development is used.
  • the toner applied is of the same polarity as the electrostatic image. It deposits in the areas of lowest charge (the discharged areas) to form a toner image having a density which is greatest in the portions of the image receiving the greatest exposure.
  • US-A-4 703 334 discloses a printhead with a positioning bar to keep the distance between source and webtype image member constant.
  • the feature of exposure through the support can be used in process color imaging as well as accent color imaging. Exposure through the support has many advantages other than avoiding the earlier images. For example, there is often more room for a printhead writer assembly on the side of the image member opposite the toning station. The printhead is less likely to become dirty from airborn toner. Charged area development is easier to use.
  • FIG. 1 is a side schematic of an image forming apparatus.
  • FIGS. 2, 6, 7 and 8 are perspective views of portions of an LED printhead writer assembly.
  • FIGS. 3-5 and 8 are side views of an LED printhead writer assembly with FIG. 4 showing an alternative embodiment to FIGS. 3 and 8.
  • FIG. 1 shows an apparatus for producing two color images in which the second exposure is through the base.
  • an image member 1 is in the form of an endless belt trained about a series of rollers, including a tension roller 16 and a drive roller 18, to continuously move through a series of electrophotographic stations well known in the art.
  • Image member 1 is charged by a charging device 10 to uniform potential, for example, a negative potential. It is imagewise exposed by an exposure device, for example, LED printhead 7 to create a first electrostatic image.
  • the first electrostatic image is toned at a first toning station 15 by the application of toner having a polarity the same as the original charging station 10, for example, a negative polarity and having a small particle size, for example, 8 microns. Toner is, thus, applied to the areas discharged by exposure station 7.
  • the image member is recharged by an additional charging station 20 which evens up the charge of the first polarity on the image member at a predetermined level. This level need not be the same as the charge applied by station 10. However, before recharging, the image member is exposed to overall blanket radiation through its support by erase lamp 19. As described above, this causes the toner to be more firmly held to the image member, despite charge from the charging station 20.
  • a magnetic scavenger 27 is positioned to attract any carrier inadvertently picked up by the image member in the first toning step. The position of scavenger 27 before toning station 25 is to prevent carrier used in station 15 from carrying dark toner into station 25.
  • the image member 1 is then imagewise exposed by a second exposure station, for example, a second LED printhead 17 which is positioned inside image member 1 and exposes image member 1 through its transparent support to create a second electrostatic image.
  • the second electrostatic image is toned by a second toning station 25 which applies toner preferably of a color different than that applied by station 15 to create a second toner image on the image member, preferably with toner of a larger particle size, for example, 12 microns, thereby forming a two color or multicolor image on the image member.
  • a receiving sheet is fed from a receiving sheet supply 29 into overlying contact with the two color toner image.
  • the two color toner image is transferred to the receiving sheet at a conventional biased roller electrostatic transfer station 31 and the receiving sheet separates from the image member as the image member goes around a small roller 24.
  • the receiving sheet is transported by a vacuum transport 33 to a fuser 35 where the two color image is fixed to the receiving sheet.
  • the receiving sheet is ultimately deposited in an output tray 37.
  • the image member is cleaned by cleaning device 39 so that the process can be continued.
  • This apparatus doubles the speed of forming two color images, compared to conventional approaches in which the images are formed on separate. frames and transferred in registration. It also avoids the complexity of registering two image transfers with the attendant complex receiver handling.
  • Toning stations 15 and 25 are preferably constructed as in US-A-5,001,028,.
  • the first toning station 15 is spaced from the image member 1 by an amount less than the nap of the magnetic brush.
  • the brush thus, directly contacts the image member, providing a high quality dense image.
  • the second toning station 25 is spaced from image member 1 by enough that the nap does not directly contact image member 1.
  • An AC component on the bias on station 25 helps provide the density desired in the second image despite the gap between the nap and the image member.
  • FIGS. 2-9 show the details of a linear printhead writer assembly 50 suitable for use as either printhead 7 or printhead 17 in FIG. 1.
  • its construction makes it particularly adaptable to backside location and is, therefore, particularly usable as printhead 17 in FIG. 1.
  • linear printhead writer assembly 50 includes a linear source of radiation, for example, a linear LED array 52 (Fig. 9), a linear focusing means, for example, a linear lens 54 such as a conventional Selfocâ (trademark of Hitachi, Ltd.) lens and a suitable support housing.
  • the LED array is supported on support tiles 64 (FIG. 2) which, in turn, are supported on a mother board 62 which, in turn, is supported on a baseplate 60.
  • the baseplate 60 is fixed with respect to a pair of support or datum plates 56 and 58 which are positioned at each of the baseplate ends.
  • the lens 54 is fixed to a lens support 55 to which is affixed a pair of end supports 67 and 69 using a thermal compensating means which will be described below.
  • End supports 67 and 69 each contain screw holes 76 which are positioned in alignment with oversized holes 66 in support plates 56 and 58 (FIG. 2). Screws 65, each with an oversized washer 68 (FIGS. 3 and 9) are inserted through holes 66 and into screw holes 76. The screws 65 can be moved within holes 66 to position lens 54 with respect to LED array 52 for final factory adjustment of those two components.
  • a single positioning bar 70 is mounted between support plates 56 and 58.
  • the LED array 52, the lens 54 and the positioning bar 70 are all elongated parallel to a Z axis. (Orthogonal X, Y and Z axes are shown in FIG. 2.)
  • the upper surface of positioning bar 70 contacts image member 1, as shown in FIGS. 3 and 9, to control the distance (in a Y direction) between image member 1 and lens 54 and LED array 52.
  • Both factory and field adjustment of positioning bar 70 is accomplished by mounting positioning bar 70 eccentrically on a shaft 74.
  • Shaft 74 is mounted on support plates 56 and 58.
  • a knob 72 is used to rotate shaft 74 to rotate bar 70. Because of the eccentric mounting of bar 70 with respect to shaft 74, the top surface of bar 70 moves toward and away from LED array 52 as bar 70 is rotated.
  • lens 54 Focusing of lens 54 with respect to both conjugates is best shown by reference to FIG. 9, in which unnecessary details are eliminated.
  • writer assembly 50 is mounted in a suitable fixture for adjusting focus (see, for example, US-A-4,928,139).
  • Lens 54 is moved in the fixture until LED array 52 is imaged, by lens 54, at a desired linear exposure locus 78, which locus is also parallel to the Z axis. This movement is accomplished by movement of screws 65 within oversized holes 66 in plates 56 and 58. When the proper focus is obtained, the screws 65 are tightened to fix lens 54 with respect to LED array 52 and plates 56 and 58.
  • Factory adjustment of positioning bar 70 can be accomplished at the same time by rotating knob 72 to rotate positioning bar 70 around eccentric shaft 74.
  • a length of web for example, a web having the same thickness as the proposed image member 1, can be tensioned across bar 70 to help in determining whether the appropriate side of the web is positioned in exposure locus 78 as the knob 72 is rotated. Determination of focus can also be done with appropriate instrumentation, known in the art.
  • assembly 50 When the assembly 50 is inserted in the image forming apparatus shown in FIG. 1, assembly 50 is fixed to the mechanism plates of the apparatus. As shown in FIG. 9, assembly 50 is positioned so that the positioning bar 70 intersects the path of image member 1 and, thus, lightly pushes the image member away from its normal path, for example, its path between rollers 16 and 18 in FIG. 1. If toning stations 15 and 25 have parts which control the position of image member 1, then bar 70 would intersect the path of image member 1 between the developing stations. Thus, the positioning bar 70 partially defines the path of image member 1.
  • Positioning bar 70 has the function of moving the lateral position of image member 1 to assure proper location of the sensitive part of image member 1 with respect to the exposure locus 78. Note that this positioning structure is not dependent upon the use of springs to urge the printhead assembly against backing members or the image member itself.
  • the printhead assembly is fixed with respect to the mechanism plates of the apparatus. Extremely accurate positioning of the printhead in the apparatus is also not critical providing bar 70 intersects the path of image member 1.
  • Positioning bar 70 is shown in the FIGS. as adjustable as a unit from one end by rotation as described.
  • eccentric mounts at each end can be provided which would allow field adjustment of each end of bar 70 with respect to the exposure locus. This is ordinarily not necessary, since skew adjustment of lens 54 in the factory (using screws 65) assures a parallel relation between the exposure locus 78 and bar 70.
  • FIG. 4 illustrates an alternative embodiment in which two positioning bars 70 and 80 are positioned on opposite sides of lens 54 and both contact image member 1.
  • This structure is very similar to the embodiment shown in FIGS. 2, 3 and 9. It has the advantage of precisely determining the location of image member 1 without regard to orientation of the assembly 50 in the apparatus.
  • the embodiments shown in FIGS. 2, 3 and 9, however, have the advantage of simplicity and also have no danger of being overconstrained, a condition that can occur with two positioning bars. Note that either of the positioning bars can be adjustable, or both can be adjustable, depending upon the amount of adjustment desired.
  • image member 1 when in contact with positioning bar 70, will have a slight break to it because the direct mounting for assembly 50 assumes intersection by positioning bar 70 with the path of image member 1 so that the path of image member 1 can be controlled by positioning bar 70.
  • Positioning bar 70 is shown as being rotatable only to adjust its spacing from lens 54. However, it could also be a roller rotatable with the image member 1. This has the advantage of reducing friction between the bar 70 and the image member 1, but it makes the eccentric mount of the bar somewhat more complicated.
  • FIGS. 5-8 illustrate a thermal compensation device for lens 54.
  • lens 54 is fixed to lens support 55 which, in turn, is secured to end supports 67 and 69.
  • the LED array As the LED array is used, it gradually heats up the lens and the lens support.
  • the lens and lens support can be made of similar materials and expand together.
  • the housing for example, baseplate 60, does not necessarily expand at the same rate. Thus, it is conventional to provide a thermal compensation coupling between the housing and the lens support.
  • lens support 55 has a pair of pins 82 at each end.
  • the pins have an axis oriented in the X direction (FIG. 2) and generally transverse to the longitudinal orientation of the lens support 55 (Z direction).
  • the pins are inserted in oversized holes 84 in end supports 67 and 69, as best seen in FIG.5. Thermal expansion in the Z direction would cause a buckling of lens support 55 if not compensated for. Such thermal expansion is permitted by the looseness of fit between pins 82 and oversized holes 84.
  • a dampener 90 for example, a spring or elastomer, which is positioned to resiliently resist movement of pins 82 in the Z direction away from the center of the lens support 55.
  • the dampeners 90 are held in end supports 67 and 69 by spring loaded shoulder screws 86.
  • they are rubber shock absorbers which can be loosened or tightened by screws 86 to vary their force on pins 82.
  • Lens support 55 is secured to each of end supports 67 and 69 using a shoulder screw, not shown, secured in a hole 96 in lens support 55 through an oversized hole 98 in the end support.
  • the shoulder screw is tightened against a spring that fits between it and a shoulder of the end support.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)

Claims (7)

  1. Appareil de formation d'images comprenant :
    un élément image (1) du type bande pouvant se déplacer le long d'un trajet, ayant au moins une couche sensible aux rayonnements sur une première face (77) et une base transparente (3) ; et
    un ensemble imprimante à tête d'impression linéaire destiné à enregistrer une image sur ladite couche sensible aux rayonnements, ledit ensemble imprimante comprenant :
    une source de rayonnement linéaire allongée (52)
    un dispositif de mise au foyer linéaire allongé (54) destiné à mettre au foyer un rayonnement issu de ladite source de rayonnement linéaire sur un site d'exposition allongé (78),
    un boítier support (56) destiné à supporter à la fois ladite source de rayonnement (52) et le dispositif de mise au foyer (54) dans des positions relatives fixes l'une par rapport à l'autre et par rapport au site d'exposition (78), ladite source de rayonnement (52), ledit dispositif de mise au foyer (54) et ledit site d'exposition (78) étant allongés dans une direction transversale à la voie par rapport au trajet de l'élément image et fixes l'un par rapport à l'autre;
    au moins une barre de positionnement (70), elle aussi allongée dans la direction transversale à la voie; et
    des moyens destinés à supporter la barre de positionnement de manière qu'elle soit positionnée avec précision par rapport au site d'exposition, pour attaquer l'élément image (1) et commander la position de l'élément image (1) avec sa couche sensible aux rayonnements dans le site d'exposition (78), ladite barre de positionnement étant positionnée pour entrer en contact avec ladite base (3) pour assurer l'exposition à travers la base (3).
  2. Appareil selon la revendication 1, dans lequel la barre de positionnement (70) est réglable par rapport au dispositif de mise au foyer (54) pour ajuster la distance entre un élément image attaqué (1) et le dispositif de mise au foyer (54);
  3. Appareil selon les revendications 1 ou 2, dans lequel la source de rayonnement linéaire est une rangée linéaire de DEL.
  4. Appareil selon les revendications 1, 2 ou 3, comprenant une deuxième barre de positionnement (80), les deux barres de positionnement (70, 80) étant placées de part et d'autre du site d'exposition.
  5. Appareil selon les revendications 2, 3 ou 4, dans lequel la barre de positionnement (70) est montée excentriquement et on peut la faire tourner autour de la monture excentrique (72, 74) pour faire varier la distance entre l'élément image attaqué (1) et le dispositif de mise au foyer (54).
  6. Appareil selon une quelconque des revendications 1 à 5, comprenant un support de lentille (55) auquel ledit dispositif de mise au foyer (54) est fixé, et un support d'extrémité (67, 69) positionné à chaque extrémité du support de lentille, et des moyens d'accouplement (82, 84, 86, 90) qui accouplent le support de lentille et les supports d'extrémité et qui permettent une dilatation thermique dudit support de lentille dans la direction transversale à la voie par rapport à chacun desdits supports d'extrémité.
  7. Appareil selon la revendication 6, dans lequel lesdits moyens d'accouplement comprennent des moyens amortisseurs (86,90) ayant une force élastique antagoniste à la dilatation thermique dudit support de lentille à chaque extrémité dudit support de lentille, lesquels moyens amortisseurs tendent aussi à isoler le support de lentille des vibrations transmises en provenance du boítier support.
EP97100597A 1993-05-20 1994-05-06 Dispositif de formation d'image avec exposition à travers un support d'image en forme de bande Expired - Lifetime EP0774698B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US65246 1993-05-20
US08/065,248 US5485190A (en) 1993-05-20 1993-05-20 Printhead writer assembly engageable with a web image member
US65248 1993-05-20
US08/065,246 US5985499A (en) 1993-05-20 1993-05-20 Method and apparatus for forming two toner images in a single frame
EP19940107101 EP0625730B1 (fr) 1993-05-20 1994-05-06 Méthode de formation de deux images de toner superposées

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP94107101.1 Division 1994-05-06
EP19940107101 Division EP0625730B1 (fr) 1993-05-20 1994-05-06 Méthode de formation de deux images de toner superposées

Publications (3)

Publication Number Publication Date
EP0774698A2 EP0774698A2 (fr) 1997-05-21
EP0774698A3 EP0774698A3 (fr) 1998-04-22
EP0774698B1 true EP0774698B1 (fr) 2001-07-25

Family

ID=26745381

Family Applications (2)

Application Number Title Priority Date Filing Date
EP97100597A Expired - Lifetime EP0774698B1 (fr) 1993-05-20 1994-05-06 Dispositif de formation d'image avec exposition à travers un support d'image en forme de bande
EP19940107101 Expired - Lifetime EP0625730B1 (fr) 1993-05-20 1994-05-06 Méthode de formation de deux images de toner superposées

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19940107101 Expired - Lifetime EP0625730B1 (fr) 1993-05-20 1994-05-06 Méthode de formation de deux images de toner superposées

Country Status (3)

Country Link
EP (2) EP0774698B1 (fr)
JP (1) JPH0798529A (fr)
DE (2) DE69427833T2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5700611A (en) * 1995-12-07 1997-12-23 Eastman Kodak Company Method for forming overlapping toner images
US5748218A (en) * 1996-01-17 1998-05-05 Eastman Kodak Company Method for forming toner images with two distinct toners
EP0785478B1 (fr) 1996-01-17 2002-12-11 NexPress Solutions LLC Procédé de formation d'images de toner utilisant deux matériaux de toner distincts
JP6826775B2 (ja) * 2016-10-25 2021-02-10 株式会社リコー 画像形成装置

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Publication number Priority date Publication date Assignee Title
US4703334A (en) * 1983-08-26 1987-10-27 Ricoh Company, Ltd. Optical recording head and belt positioning apparatus
JPS60130728A (ja) * 1983-12-19 1985-07-12 Matsushita Electric Ind Co Ltd 電子写真装置のピント調整装置
JPS60247264A (ja) * 1984-05-23 1985-12-06 Japan Steel Works Ltd:The 多色電子写真装置
US4778740A (en) * 1986-03-31 1988-10-18 Matsushita Electric Industrial Co., Ltd. Color electrophotographic method and apparatus
JPS6349780A (ja) * 1986-08-19 1988-03-02 Nec Corp 光プリントヘツド焦点位置調整機構
US5053821A (en) * 1987-10-06 1991-10-01 Seiko Epson Corporation, A Corporation Of Japan Electrophotographic image forming apparatus using photoconductive toner
US5001028A (en) * 1988-08-15 1991-03-19 Eastman Kodak Company Electrophotographic method using hard magnetic carrier particles
US4928139A (en) * 1988-11-21 1990-05-22 Eastman Kodak Company Assembly containing a linear focusing means and method of making same
US5057875A (en) * 1989-01-27 1991-10-15 Oki Electric Industry Co., Ltd. Image forming apparatus provided with an image bearing film and a movable transfixing station

Also Published As

Publication number Publication date
DE69427833D1 (de) 2001-08-30
DE69427833T2 (de) 2002-04-04
EP0625730A3 (fr) 1995-01-11
EP0774698A3 (fr) 1998-04-22
EP0625730A2 (fr) 1994-11-23
DE69404550D1 (de) 1997-09-04
EP0774698A2 (fr) 1997-05-21
JPH0798529A (ja) 1995-04-11
EP0625730B1 (fr) 1997-07-30
DE69404550T2 (de) 1998-02-12

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