US3679301A - Multicolor electrophotographic device - Google Patents

Multicolor electrophotographic device Download PDF

Info

Publication number
US3679301A
US3679301A US41365A US3679301DA US3679301A US 3679301 A US3679301 A US 3679301A US 41365 A US41365 A US 41365A US 3679301D A US3679301D A US 3679301DA US 3679301 A US3679301 A US 3679301A
Authority
US
United States
Prior art keywords
photosensitive member
developing
color separation
reproducing device
rotary disc
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
US41365A
Other languages
English (en)
Inventor
Shozo Inoue
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.)
Canon Inc
Original Assignee
Canon 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 Canon Inc filed Critical Canon Inc
Application granted granted Critical
Publication of US3679301A publication Critical patent/US3679301A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • G03G15/01—Apparatus for electrographic processes using a charge pattern for producing multicoloured copies
    • G03G15/0142—Structure of complete machines

Definitions

  • PAIENTEDJULZS 1912 BEST AVAILABLE COPY 3.679.301 sum 1 BF 3 Y BEST AVAILABLE copy a 3.679.301
  • This invention relates to an electrophotographic multicolor image reproducing device, and more particularly to such device in which a photosensitive member is stationary and a rotary disc having various electrophotographic process means mounted thereon is rotated over the stationary photosensitive member to provide a multicolor image reproduction thereon.
  • Multicolor image reproducing devices employ a system whereby movement of photosensitive member for each color separation is controlled with high accuracy or a system whereby a photosensitive member is stationary and various electrophotographic process means for each color printing are manually moved.
  • the former system it is very hard to achieve registration and a device to solve this problem should be highly accurate in performance and is generally larger in size as well as higher in manufacturing cost.
  • the latter system is very poor in efiiciency because of its manual operation and has little or no practicability as a business machine. If the manually operated system is replaced by an automatic system, the device itself must be more and more complicated and sophisticated in construction to satisfy the requirement of registration between the repeated exposure positions and this will unavoidably lead to a higher cost.
  • a photosensitive member which comprises a layer of photosensitive material supported on a transparent support member and a frame of thick paper or like material having said layer and said support member attached thereto.
  • Such photosensitive member is placed stationarily within the device nd an object to be copied placed on a document supporting table is optically projected to the photosensitive member by a source of light through mirrors a lens and color separating filters.
  • the photosensitive member has the photosensitive layer thereof facing downward, and in face-to-face relationship with that downwardly facing photosensitive layer there is disposed a rotary disc provided with various electrophotographic process means.
  • the rotary disc is rotated upon projection of the original image to be copied, so that the photosensitive member may be subjected to the various electrographic processes by the rotation of the rotary disc.
  • the number of the various electrographic process means provided on the rotary disc corresponds to the umber of colors required for the multicolor printing.
  • Electrophotographic process means for the colors corresponding to the color separation filters operate in synchronism with each other, and thereby a multicolor image reproduction is carried out.
  • FIG. I is a side view, partially in cross section, of an embodiment of the present invention. 7
  • FIG. 2 is a horizontal view of the rotary disc incorporated in the device of FIG. 1 and showing arrangement of various means;
  • FIG. 3 is a cross-sectional view of the developing means used with the FIG. 1 embodiment
  • FIG. 4 is an enlarged fragmentary view showing a part of FIG. 3;
  • FIG. 5 shows a cross sectional view of the drying means
  • FIG. 6 is a view for illustrating a manner in which the residual developing solution on the photosensitive member is positively removed by contemporaneously effecting the electric charging and drying processes.
  • FIG. 7 is a perspective view showing an example of the photosensitive member used in the present invention.
  • the photosensitive member used in the present invention is generally indicated by 1 in FIG. 7.
  • the photosensitive member 1 comprises a photosensitive material 2 formed of layer of photosensitive material and a transparent support member such as polyester film or the like, and a frame 3 of thick paper or like material available for use as a color slide or apertured card and having said photosensitive material 2 attached thereto.
  • the photosensitive material may be an organic photoconductive material, for example, condensed polycyclic aromatic compounds such as anthracene, carbazole, anthraquinone and perylene, acyl hydrazone derivative, heterocyclic compounds such as triphenyl pyrazoline derivative and the like, or organic materials such as poly-N-vinyl carbazole and the like.
  • the material forming the photosensitive layer and the material forming the photosensitive member are not limited to the abovementioned materials.
  • a photosensitive member I is fixed within the device and an image of an object 5 to be copied placed on a document supporting table 4 is, projected to photosensitive member 1 by a light source 6 through mirrors 7 and 8, a lens 9 and a color separation filter 10.
  • the photosensitive member 1 has the photosensitive layer facing downward, and in face-to-face relationship with the downwardly facing photosensitive layer there is disposed a rotary disc 12 provided with various electrophotographic process means and driven to rotate by a motor M1.
  • the photosensitive member 1 is fed into the device through an inlet 13 and then carried to a developing means through feed rolls 14,, 14 to 18.
  • a setting switch MS is actuated to stop the rotation of feed rolls.
  • a swinging door 50 is provided to a housing 49 for the purpose of maintenance and check-up of the electrophotographic processing means.
  • rotary disc 2 comprises first to third process means 19 to 21, which are respectively provided with different color developing means 22 to 24. Natural color printing by electrography usually needs three processes, but if four or more processes are required, the number of the process means used is increased accordingly.
  • Each of he process means 19 to 21 is further provided with electrically charging means 25, cleaning means 26 and drying means 27 which are all provided on the rotary disc 12.
  • Control signal members 28 peripherally provided on the rotary disc 12 cooperate with a detector means 29 provided outside of the rotary disc 12 so as to control the motor M1 to rotate the rotary disc 12 intermittently in a predetermined direction.
  • Such intermittent rotations of the rotary disc 12 bring the process means 19 to 21 into their operative position in succession, and in synchronism therewith the color separation filter 10 (FIG. 1) is changed through a motor M2.
  • the photosensitive member 1 is exposed to different separated color lights in succession.
  • the rotary disc I2 When the photosensitive member is placed at a position shown by the dotted lines in FIG. 2, the rotary disc I2 is rotated to the direction of the arrow while it is electrically charged by the electrically charging means 25.
  • the rotating disc 12 brings the developing means 22 thereon into registered relationship with the photosensitive member 1
  • rotary disc 12 is stopped by a signal from control member 28 and detector means 29 at that position, and an image to be copied is projected through a color separation filter 10 to the photosensitive member 1 to form electrostatic latent images.
  • the pump 32 is driven by motor M3 in FIG. 3 responding to an exposure termination signal, and thereby developer liquid 31 in reservoir 30 is fed to developing cylinder 29.
  • the developer liquid overflows through a perforated 34 having small holes mounted to the top opening of developing cylinder 29 which is positioned in such a manner that the overflow coincides with the image portion of ing is carried out.
  • the developer liquid overflowing the developing cylinder 29 is recovered to receiver 35.
  • pump 32 is stopped by a developing termination signal, and rotary disc 12 is rotated until a cleaning 26 comes into contact with photosensitive member 1.
  • Another example of the developing means is that a rotatable developing roller impregnating a developer liquid comes into contact with the photosensitive member.
  • the cleaning means 26 is provided, if necessary, which may be a similar structure to that of the developing means except that a cleaning liquid is used in place of developer liquid. The remaining developer liquid is removed which causes fog at the developed portion.
  • the drying means 27 is provided, if necessary. Referring to FIG. 5, wind or hot wind is blown to photosensitive member 1 by fan 37 to dry the photosensitive member 1. When the blowing is carried out simultaneously with charging by rotating charging means 38 having discharging wire 38, cleaning liquid 36 on the photosensitive member is pushed to a direction opposite to a direction to which the charging means moves as illustrated in FIG. 6 and thereby the drying capacity increases.
  • the exposure is effected to photosensitive member 1 from above.
  • another example of exposure means is that an exposure opening is provided at a region between charging means 25 and developing means 22 (23 or 24) on rotary disc 12 in FIG. 2 and the exposure may be made from the lower side of rotary disc 12.
  • the electrophotographic device employs a stationary photosensitive member and exposure means and a rotary disc provided with various electrophotographic process means which is intermittently rotatable to effect the various electrophotographic processes in succession, whereby the exposure of the photosensitive member to separated colors may be repeated without any care being taken of the registration between the resultant color images.
  • the rotary system adopted for the process means only requires a simple driving mechanism to achieve a high performance and this leads to the provision of a highly practical and inexpensive device for the electrophotographic multicolor image reproduction.
  • An electrophotographic multicolor image reproducing device which comprises 1 means for charging a photosensitive member uniformly,
  • An electrophotographic multicolor image reproducing device according to claim 3, wherein said positioning means of the developing means is provided with as many means for cleaning residual developer as the developing means.
  • An electrophotographic multicolor image reproducing device according to claim 4, wherein said positioning means of the developing means is provided with as many drying means as the developing means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Color Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
US41365A 1969-05-31 1970-05-28 Multicolor electrophotographic device Expired - Lifetime US3679301A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1969051117U JPS4917650Y1 (enrdf_load_stackoverflow) 1969-05-31 1969-05-31

Publications (1)

Publication Number Publication Date
US3679301A true US3679301A (en) 1972-07-25

Family

ID=12877849

Family Applications (1)

Application Number Title Priority Date Filing Date
US41365A Expired - Lifetime US3679301A (en) 1969-05-31 1970-05-28 Multicolor electrophotographic device

Country Status (4)

Country Link
US (1) US3679301A (enrdf_load_stackoverflow)
JP (1) JPS4917650Y1 (enrdf_load_stackoverflow)
DE (2) DE2065762A1 (enrdf_load_stackoverflow)
GB (1) GB1316651A (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795917A (en) * 1969-05-22 1974-03-05 Canon Kk Electronic photocopying apparatus
JPS50131530A (enrdf_load_stackoverflow) * 1974-04-04 1975-10-17
US3936178A (en) * 1973-11-26 1976-02-03 Coulter Information Systems, Inc. Apparatus for large scale screen display of images
US3941468A (en) * 1971-06-07 1976-03-02 Marlin & Company Systems Engineers Inc. Identification structure, means for, and method of production
US3964828A (en) * 1972-12-29 1976-06-22 Ricoh Co., Ltd. Apparatus for preparing electrophotographic microfilm
JPS5223945A (en) * 1975-08-19 1977-02-23 Matsushita Electric Ind Co Ltd Electrophotographic slide preparing device
JPS5224535A (en) * 1975-08-20 1977-02-24 Matsushita Electric Ind Co Ltd Electrophotographic slide preparing device
EP0007193A1 (en) * 1978-06-28 1980-01-23 Archie Ramsden Grace Projection colour copier
US5010415A (en) * 1989-08-24 1991-04-23 Brother Kogyo Kabushiki Kaisha Image forming apparatus having switchable color separation filter units
WO1993004410A1 (en) * 1991-08-14 1993-03-04 Coulter Corporation Electrophotographic microfilm camera/processor apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3130655A (en) * 1963-01-21 1964-04-28 Minnesota Mining & Mfg Photographic apparatus
US3424764A (en) * 1965-06-16 1969-01-28 American Cyanamid Co Iminonaphtho(2,3-d)-1,3-dithiole-4,9-diones
US3531195A (en) * 1963-07-25 1970-09-29 Hitachi Ltd Method and apparatus for multicolor printing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3130655A (en) * 1963-01-21 1964-04-28 Minnesota Mining & Mfg Photographic apparatus
US3531195A (en) * 1963-07-25 1970-09-29 Hitachi Ltd Method and apparatus for multicolor printing
US3424764A (en) * 1965-06-16 1969-01-28 American Cyanamid Co Iminonaphtho(2,3-d)-1,3-dithiole-4,9-diones

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3795917A (en) * 1969-05-22 1974-03-05 Canon Kk Electronic photocopying apparatus
US3941468A (en) * 1971-06-07 1976-03-02 Marlin & Company Systems Engineers Inc. Identification structure, means for, and method of production
US3964828A (en) * 1972-12-29 1976-06-22 Ricoh Co., Ltd. Apparatus for preparing electrophotographic microfilm
US3936178A (en) * 1973-11-26 1976-02-03 Coulter Information Systems, Inc. Apparatus for large scale screen display of images
JPS50131530A (enrdf_load_stackoverflow) * 1974-04-04 1975-10-17
JPS5223945A (en) * 1975-08-19 1977-02-23 Matsushita Electric Ind Co Ltd Electrophotographic slide preparing device
JPS5224535A (en) * 1975-08-20 1977-02-24 Matsushita Electric Ind Co Ltd Electrophotographic slide preparing device
EP0007193A1 (en) * 1978-06-28 1980-01-23 Archie Ramsden Grace Projection colour copier
US5010415A (en) * 1989-08-24 1991-04-23 Brother Kogyo Kabushiki Kaisha Image forming apparatus having switchable color separation filter units
WO1993004410A1 (en) * 1991-08-14 1993-03-04 Coulter Corporation Electrophotographic microfilm camera/processor apparatus
US5241340A (en) * 1991-08-14 1993-08-31 Coulter Corporation Electrophotographic microfilm camera/processor apparatus

Also Published As

Publication number Publication date
DE2065762A1 (de) 1975-08-14
DE2026776A1 (de) 1970-12-17
GB1316651A (en) 1973-05-09
JPS4917650Y1 (enrdf_load_stackoverflow) 1974-05-08

Similar Documents

Publication Publication Date Title
US3819263A (en) Cleaning apparatus
US3547533A (en) Microfilm reproduction machine
US3784297A (en) Photocopying machine
US3612677A (en) Electrostatic transfer apparatus
US3912387A (en) Electrostatography
US3679301A (en) Multicolor electrophotographic device
US3002434A (en) Film viewer and reproducer
US3580670A (en) Apparatus for duplexing
US3661452A (en) Xerographic reproduction machine
US3520604A (en) Photoelectrostatic copier
US3970042A (en) Color development apparatus
US3120790A (en) Xerographic exposure apparatus
GB1077831A (en) Method and apparatus for multicolour xerographic printing
US3606532A (en) Photoelectrostatic duplicator
US3724943A (en) Color reproduction apparatus
US3511564A (en) Reader-printer with plastic transport belt
GB1568253A (en) Multicolour electrostatic printing apparatus
GB1350283A (en) Electrophotographic re-enlarging apparatus
US3694069A (en) Copying apparatus
US3011473A (en) Xerographic apparatus
US3575139A (en) Electrostatic magnetic developer unit gating apparatus
US3420151A (en) Apparatus for electrophotographic printing
US3574456A (en) Apparatus for producing electrophotographic copies
US3841751A (en) Electrostatic color reproduction method
US3523725A (en) Xerographic reproducing apparatus