GB1426907A - Electrostatic photocopying - Google Patents

Electrostatic photocopying

Info

Publication number
GB1426907A
GB1426907A GB2288073A GB2288073A GB1426907A GB 1426907 A GB1426907 A GB 1426907A GB 2288073 A GB2288073 A GB 2288073A GB 2288073 A GB2288073 A GB 2288073A GB 1426907 A GB1426907 A GB 1426907A
Authority
GB
United Kingdom
Prior art keywords
exposure
charge level
charge
rate characteristic
rate
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
GB2288073A
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.)
AB Dick Co
Original Assignee
AB Dick Co
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 AB Dick Co filed Critical AB Dick Co
Publication of GB1426907A publication Critical patent/GB1426907A/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
    • G03G15/04—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
    • G03G15/043—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 controlling illumination or exposure

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

1426907 Electro-photography A B DICK CO 14 May 1973 [15 May 1972] 22880/73 Heading G2H The exposure of a photo-conductive member 10 is controlled by monitoring the electrostatic charge on the member as exposure proceeds and terminating the exposure when the rate of change of the average charge on the member, with respect to which an indefinite exposure would produce successive rates R 1 , R 2 , R 3 , moves from the R 2 rate characteristic of under exposure to the R 3 rate characteristic of over exposure. At time t 2 the second differential (graph c) of the charge level shows a sharp negative pulse, which operates a switch 23 to shut-off an exposing lamp 15. The exact time of t 2 , and the corresponding charge level V 2 , depend on the ratio of image matter to background in the original 13 reproduced. Preferably the member 10 is a zinc oxide coated paper, and its charge level is monitored by a lower earthed electrode 12 and an upper transparent electrode 11 through which the exposure is made.
GB2288073A 1972-05-15 1973-05-14 Electrostatic photocopying Expired GB1426907A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US25304572A 1972-05-15 1972-05-15

Publications (1)

Publication Number Publication Date
GB1426907A true GB1426907A (en) 1976-03-03

Family

ID=22958609

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2288073A Expired GB1426907A (en) 1972-05-15 1973-05-14 Electrostatic photocopying

Country Status (5)

Country Link
US (1) US3749488A (en)
JP (1) JPS4967630A (en)
CA (1) CA988148A (en)
DE (1) DE2324498C3 (en)
GB (1) GB1426907A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3880512A (en) * 1973-05-21 1975-04-29 Coulter Information Systems Image recording apparatus for electrophotographic film
IT1047047B (en) * 1973-08-17 1980-09-10 Coulter Information Systems IMAGE RECORDING METHOD AND APPARATUS FOR ELECTROPHOTOGRAPHIC FILM
JPS5926957B2 (en) * 1973-12-28 1984-07-02 キヤノン株式会社 Color electrophotographic method
US3909126A (en) * 1974-03-18 1975-09-30 Xerox Corp Multi-process control system for an electrophotographic printing machine
JPS6040024B2 (en) * 1976-09-17 1985-09-09 キヤノン株式会社 Electrostatic latent image stabilization method
US4176943A (en) * 1976-10-18 1979-12-04 Ricoh Company, Ltd. Electrophotographic apparatus
JPS5381121A (en) * 1976-12-27 1978-07-18 Kip Kk Method of taking electrophotography and device therefor
JPS55151652A (en) * 1979-05-17 1980-11-26 Canon Inc Electrophotographic apparatus
US4624548A (en) * 1983-07-22 1986-11-25 Canon Kabushiki Kaisha Image density control device
DE3409701A1 (en) * 1984-03-16 1985-09-19 Hoechst Ag, 6230 Frankfurt METHOD AND ARRANGEMENT FOR COMPLYING WITH A PRESENT POTENTIAL RATIO IN THE EXPOSURE OF ELECTROSTATICALLY CHARGED LIGHT SENSITIVE LAYERS
JPH04212181A (en) * 1990-06-14 1992-08-03 Sharp Corp Image forming device with detector detecting decrease in thickness of photosensitive body film

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3438704A (en) * 1966-10-11 1969-04-15 Xerox Corp Illumination control system
JPS4514158Y1 (en) * 1966-10-31 1970-06-15
US3635555A (en) * 1968-11-25 1972-01-18 Canon Kk Electrophotographic copying device
US3679306A (en) * 1971-01-21 1972-07-25 Pitney Bowes Inc Feedback system for controlling image light energy in electrostatic photocopiers

Also Published As

Publication number Publication date
DE2324498A1 (en) 1973-11-22
DE2324498C3 (en) 1975-10-23
US3749488A (en) 1973-07-31
CA988148A (en) 1976-04-27
DE2324498B2 (en) 1975-03-06
JPS4967630A (en) 1974-07-01

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee