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GB1485157A - Image recording method and apparatus for electrophotographic film - Google Patents

Image recording method and apparatus for electrophotographic film

Info

Publication number
GB1485157A
GB1485157A GB3615874A GB3615874A GB1485157A GB 1485157 A GB1485157 A GB 1485157A GB 3615874 A GB3615874 A GB 3615874A GB 3615874 A GB3615874 A GB 3615874A GB 1485157 A GB1485157 A GB 1485157A
Authority
GB
United Kingdom
Prior art keywords
peak voltage
light intensity
exposure
fixed
exposure time
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
Application number
GB3615874A
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
Priority claimed from US389124A external-priority patent/US3880512A/en
Application filed by Coulter Information Systems Inc filed Critical Coulter Information Systems Inc
Publication of GB1485157A publication Critical patent/GB1485157A/en
Expired 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/221—Machines other than electrographic copiers, e.g. electrophotographic cameras, electrostatic typewriters
    • 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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Or Security For Electrophotography (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)

Abstract

1485157 Electro-photographic processes COULTER INFORMATION SYSTEMS Inc 16 Aug 1974 [17 Aug 1973 (2)] 36158/74 Addition to 1438870 Heading G2H Two modifications of the parent invention are claimed. A photo-conductive film is charged to a peak voltage, imagewise exposed immediately following the charging step, and toned immediately following the exposure. In addition either: (a) the peak voltage is inversely proportional to the light intensity and the exposure is for a fixed period or (b) The peak voltage is fixed and the exposure time and/or exposure aperture is controlled in accordance with the light intensity and peak voltage. The apparatus used is substantially the same as that of the parent. Preferably in method (A) a photocell 32 measures light intensity and an electrometer 34 measures charge in order to provide a peak voltage inversely proportional to light intensity. Exposure time is then fixed by a timer 65. Preferably in method (B) the peak voltage is fixed and during exposure, charge on an unilluminated portion of the film is monitored by electrometer 34 and compared with a reference 68 set according to light intensity in order to control exposure time.
GB3615874A 1973-08-17 1974-08-16 Image recording method and apparatus for electrophotographic film Expired GB1485157A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38914973A 1973-08-17 1973-08-17
US389124A US3880512A (en) 1973-05-21 1973-08-17 Image recording apparatus for electrophotographic film

Publications (1)

Publication Number Publication Date
GB1485157A true GB1485157A (en) 1977-09-08

Family

ID=27012563

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3615874A Expired GB1485157A (en) 1973-08-17 1974-08-16 Image recording method and apparatus for electrophotographic film

Country Status (4)

Country Link
DE (1) DE2439486C2 (en)
GB (1) GB1485157A (en)
IT (1) IT1047047B (en)
NL (1) NL176497C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5492742A (en) * 1977-12-29 1979-07-23 Ricoh Co Ltd Control method for copier image quality

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2956487A (en) * 1955-03-23 1960-10-18 Rca Corp Electrostatic printing
US3068356A (en) * 1960-06-15 1962-12-11 Xerox Corp Xerographic charging apparatus
US3307034A (en) * 1963-12-09 1967-02-28 Xerox Corp Two-wire corona discharge system for single-step electrostatic image formation
US3586908A (en) * 1969-02-28 1971-06-22 Robert E Vosteen Automatic potential control system for electrophotography apparatus
US3749488A (en) * 1972-05-15 1973-07-31 Dick Co Ab Exposure control in electrostatic photocopying processes

Also Published As

Publication number Publication date
DE2439486A1 (en) 1975-02-27
IT1047047B (en) 1980-09-10
NL7410977A (en) 1975-02-19
DE2439486C2 (en) 1986-10-30
NL176497C (en) 1985-04-16
NL176497B (en) 1984-11-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee