US3632202A - Exposure frame for electrophotography - Google Patents

Exposure frame for electrophotography Download PDF

Info

Publication number
US3632202A
US3632202A US812794A US3632202DA US3632202A US 3632202 A US3632202 A US 3632202A US 812794 A US812794 A US 812794A US 3632202D A US3632202D A US 3632202DA US 3632202 A US3632202 A US 3632202A
Authority
US
United States
Prior art keywords
frame
layer
photoconductive layer
resistant layer
charging
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
US812794A
Other languages
English (en)
Inventor
Seiji Matsumoto
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
Application granted granted Critical
Publication of US3632202A publication Critical patent/US3632202A/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
    • G03G15/04—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

Definitions

  • ABSTRACT An exposure frame for use with an electrographic plate.
  • the frame includes a resistant layer on a metal frame member.
  • the resistant layer has a charging characteristic which is the same as the charging characteristic of the photoconductive layer of the electrographic plate. Since the charging characteristics are the same the portion of the photoconductive layer near the frame will not be irregularly charged.
  • the layer on the frame hasa discharge characteristic which is different from that of the photoconductive layer such that it discharges in a relatively short time compared to the photoconductive layer of the electroplate. in this manner, the frame may be used for subsequent electroplates.
  • an electrophotographic photosensitive paper which ordinarily comprises a conductive paper base and a photoconductive layer disposed thereon, is uniformly charged to give photosensitivity
  • the charging and exposing processes can be efficiently performed by holding the marginal portion of the photosensitive paper with a frame, in order to maintain the flatness of the paper, and image exposing after charging.
  • a metallic frame is preferred from the view point of mechanical strength, but the marginal portion of the photosensitive paper is apt to be irregularly charged near the frame because of the conductivity of the metallic frame. This is because the charging characteristic of the photoconductive layer on the photosensitive paper is different from that of the frame. If a layer (e.g.
  • the photosensitive surface can be uniformly charged since the charging characteristic of the photosensitive paper is identical with that of the exposure frame. If the frame is not exposed to the light during the image exposure process, however, the photosensitive surface is not uniformly charged because of the residual charge on the frame when the frame is again used in a subsequent exposure process.
  • an exposure frame which has a resistant layer on a metallic frame body, said layer having substantially the same charging.
  • an exposure frame is shown on the electrophotographic photosensitve paper on a base in FIG. 1.
  • the exposure frame 1 is covered with a resistant layer 3 on the metallic frame body 2 thereof.
  • Reference numeral 4 indicates a conductive baseboard
  • 5 indicates an electrophotographic photosensitve paper disposed thereon, of which 6 represents a conductive paper and 7 indicates a photoconductive layer.
  • the resistant layer 3 is provided for controlling the charging characteristic of the exposure frame 1.
  • the charging characteristic of the resistant layer 3 is denoted by curve A and the charging characteristic of the photoconductive layer 7 on the electrophotographic photosensitive paper 5 is denoted by curve B in FIG. 3.
  • the abscissa indicates time and the ordinate indicates the charging voltage.
  • the exposure frame 1 is placed on the photoconductive layer 7 of the electrophotographic photosensitive paper 5 and charging is started at time t, with corona discharging electrodes (not shown.)
  • the surface potential of the photoconductive layer 7 on the electrophotographic photosensitive paper 5, and the resistant layer 3 of the exposure frame I increases. Since the resistant layer 3 and the photoconductive layer 7 are charged substantially at the same time thatis they have the same charging characteristic as shownwijrrFlG. 3 between time t, and t the photoconductive. layer :7 is uniformly charged without being affected by the exposure frame 1.
  • the charging is stopped and the" photoconductive layer 7 is image exposed with the exposure frame I placed thereon. After the image exposure is completed, only the electrophotographic sensitive paper is developed.
  • the discharge characteristic of the resistant layer, Curve A is therefore different from the discharge characteristic of the photoconductive layer, curve B. Therefore, by charging the next photoconductive layer 7 with the frame I placed thereon immediately after the image exposure, a uniform charging is again attained, since there is no residual charge on the exposure frame 1.
  • the charging characteristics of the photoconductive layer 7, when charged and the resistant layer are not required to be identical with each other, but only substantially identical.
  • FIG. 2 Another embodiment of the exposure frame of the present invention is shown in FIG. 2. Specifically, the resistant layer 10 is provided on the extended portion 9 extending inwardly from the frame body 8 of high mechanical strength.
  • the electrophotographic sensitive paper may comprise a paper base with an aluminum foil layer adhered thereto, which is, in turn, coated with a powdery mixture of zinc oxide and silicon resin.
  • the latter has been mixed in a ballmill at a ratio of 4 to l by weight.
  • the exposure frame may comprise, preferably, a metallic frame body coated with a thin layer of a mixture of carbon black and silicon resin which has been previously mixed with a ballmill.
  • a solid conductive coating agent containing carbon black or metallic powder in admixture with an insulating resin may be used as the resistant layer material, which can control the resistance thereof over a wide range and whose temperature dependence of resistance is low. Even if the insulating inorganic pigment is mixed into the solid conductive coating material, a material which can control the resistance thereof over a wide range can be made. It is preferred that the resistant layer be stable and that its characteristic not be varied by stain time and the like.
  • the binder resin is preferred to be thermosetting.
  • electrophotographic photosensitive material zinc oxide, silicon, cadmium sulfide, alkyd resins, selenium and the like may be employed.
  • An exposure frame for electrophotography to enhance uniform charging on the photoconductive layer of an electrographic plate comprising a metallic frame member, a resistant layer provided on said frame member, said resistant layer having the same charging characteristic as said photoconductive layer whereby the resistant layer and the photoconductive layer are charged at substantially the same rate.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Photoreceptors In Electrophotography (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
US812794A 1968-04-02 1969-04-02 Exposure frame for electrophotography Expired - Lifetime US3632202A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1968026212U JPS474393Y1 (enrdf_load_stackoverflow) 1968-04-02 1968-04-02

Publications (1)

Publication Number Publication Date
US3632202A true US3632202A (en) 1972-01-04

Family

ID=12187113

Family Applications (1)

Application Number Title Priority Date Filing Date
US812794A Expired - Lifetime US3632202A (en) 1968-04-02 1969-04-02 Exposure frame for electrophotography

Country Status (6)

Country Link
US (1) US3632202A (enrdf_load_stackoverflow)
JP (1) JPS474393Y1 (enrdf_load_stackoverflow)
BE (1) BE730866A (enrdf_load_stackoverflow)
DE (1) DE1916544A1 (enrdf_load_stackoverflow)
FR (1) FR2005386A1 (enrdf_load_stackoverflow)
GB (1) GB1266192A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100197147A1 (en) * 2002-08-19 2010-08-05 Im James S Single-shot semiconductor processing system and method having various irradiation patterns

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619418A (en) * 1950-12-30 1952-11-25 Haloid Co Xerographic plate holder

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2619418A (en) * 1950-12-30 1952-11-25 Haloid Co Xerographic plate holder

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100197147A1 (en) * 2002-08-19 2010-08-05 Im James S Single-shot semiconductor processing system and method having various irradiation patterns

Also Published As

Publication number Publication date
DE1916544A1 (de) 1969-11-13
FR2005386A1 (enrdf_load_stackoverflow) 1969-12-12
JPS474393Y1 (enrdf_load_stackoverflow) 1972-02-15
GB1266192A (enrdf_load_stackoverflow) 1972-03-08
BE730866A (enrdf_load_stackoverflow) 1969-09-15

Similar Documents

Publication Publication Date Title
US3607258A (en) Electrophotographic plate and process
US2976144A (en) Electrophotography
US3615395A (en) Electrostatic and electrophotographic variable contrast image-forming methods
US3434832A (en) Xerographic plate comprising a protective coating of a resin mixed with a metallic stearate
US3801317A (en) Electrophotographic plate
US2970906A (en) Xerographic plate and a process of copy-making
US3677751A (en) Polarity reversal electrophotography
US3719481A (en) Electrostatographic imaging process
GB1561945A (en) Electrophotography
US3271146A (en) Xeroprinting with photoconductors exhibiting charge-storage asymmetry
US2972304A (en) Electrostatic printing
US3560203A (en) Electrophotographic developing process
US3772010A (en) Electrophotographic apparatus and method for imagewise charge generation and transfer
US3666364A (en) Electrophotographic apparatus
US3124456A (en) figure
US3723110A (en) Electrophotographic process
US3632202A (en) Exposure frame for electrophotography
US4524117A (en) Electrophotographic method for the formation of two-colored images
US3540885A (en) Reduction of fog formation in an electrophotographic light sensitive sheet
US3285740A (en) Electrophotographic process
US3666365A (en) Electrophotographic process and apparatus involving persistent internal polarization
US2619418A (en) Xerographic plate holder
US3794418A (en) Imaging system
GB1221347A (en) Electrophotographic development
US3655419A (en) Electrophotographic reversal developing process