JPS57114155A - Image reproducing apparatus - Google Patents

Image reproducing apparatus

Info

Publication number
JPS57114155A
JPS57114155A JP56000566A JP56681A JPS57114155A JP S57114155 A JPS57114155 A JP S57114155A JP 56000566 A JP56000566 A JP 56000566A JP 56681 A JP56681 A JP 56681A JP S57114155 A JPS57114155 A JP S57114155A
Authority
JP
Japan
Prior art keywords
positive
negative
image
light intensity
reference voltage
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.)
Granted
Application number
JP56000566A
Other languages
Japanese (ja)
Other versions
JPH0230015B2 (en
Inventor
Kazuo Kashiwagi
Toshio Arai
Takao Toda
Masashige Shirai
Masaaki Yanagi
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
Priority to JP56000566A priority Critical patent/JPS57114155A/en
Priority to US06/228,721 priority patent/US4341463A/en
Priority to GB8103083A priority patent/GB2071356B/en
Publication of JPS57114155A publication Critical patent/JPS57114155A/en
Publication of JPH0230015B2 publication Critical patent/JPH0230015B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/10—Projectors with built-in or built-on screen
    • G03B21/11—Projectors with built-in or built-on screen for microfilm reading
    • G03B21/118—Reader-printers
    • 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
    • G03G15/223—Machines for handling microimages, e.g. microfilm copiers

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)
  • Combination Of More Than One Step In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To automate formation of a positive copy always from a negative or positive original image, and to eliminate miscopying, by comparing the light intensity transmitted through a recorded image with a given reference value, judging a negative or positive image, and selecting a toner. CONSTITUTION:The light intensity transmitted through a positive image is higher than that through a negative image. The projected image of a microfilm is scanned with a measuring instrument 121 consisting of a photoelectric converter to measure the transmission light intensity of the film and to produce voltage corresponding to the received intensity. This output is compared with the first reference voltage of a first comparator 233. When it is higher, a positive signal is produced to execute normal development using a negative charging toner. When the output of the measuring instrument 121 is lower than the second reference voltage lower than the first reference voltage, the negative signal of the second comparator 235 causes a positive charging toner to execute reversal development, thus permitting a positive copy to be always automatically made independent of positive and negative original images, and miscopying to be eliminated.
JP56000566A 1980-02-05 1981-01-06 Image reproducing apparatus Granted JPS57114155A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP56000566A JPS57114155A (en) 1981-01-06 1981-01-06 Image reproducing apparatus
US06/228,721 US4341463A (en) 1980-02-05 1981-01-27 Image reproducing apparatus
GB8103083A GB2071356B (en) 1980-02-05 1981-02-02 Image reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56000566A JPS57114155A (en) 1981-01-06 1981-01-06 Image reproducing apparatus

Publications (2)

Publication Number Publication Date
JPS57114155A true JPS57114155A (en) 1982-07-15
JPH0230015B2 JPH0230015B2 (en) 1990-07-04

Family

ID=11477259

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56000566A Granted JPS57114155A (en) 1980-02-05 1981-01-06 Image reproducing apparatus

Country Status (1)

Country Link
JP (1) JPS57114155A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170843U (en) * 1984-10-15 1986-05-14

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4937539A (en) * 1972-08-09 1974-04-08
JPS5548755A (en) * 1978-09-30 1980-04-08 Ricoh Co Ltd Reversal image forming method
JPS55137538A (en) * 1979-04-13 1980-10-27 Fujitsu Ltd Electrophotographic recording method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4937539A (en) * 1972-08-09 1974-04-08
JPS5548755A (en) * 1978-09-30 1980-04-08 Ricoh Co Ltd Reversal image forming method
JPS55137538A (en) * 1979-04-13 1980-10-27 Fujitsu Ltd Electrophotographic recording method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6170843U (en) * 1984-10-15 1986-05-14

Also Published As

Publication number Publication date
JPH0230015B2 (en) 1990-07-04

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