JPS5576361A - Electrophotographic copier - Google Patents

Electrophotographic copier

Info

Publication number
JPS5576361A
JPS5576361A JP15028578A JP15028578A JPS5576361A JP S5576361 A JPS5576361 A JP S5576361A JP 15028578 A JP15028578 A JP 15028578A JP 15028578 A JP15028578 A JP 15028578A JP S5576361 A JPS5576361 A JP S5576361A
Authority
JP
Japan
Prior art keywords
original
detection
density
ground color
color density
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.)
Pending
Application number
JP15028578A
Other languages
Japanese (ja)
Inventor
Masazumi Yana
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP15028578A priority Critical patent/JPS5576361A/en
Publication of JPS5576361A publication Critical patent/JPS5576361A/en
Pending legal-status Critical Current

Links

Landscapes

  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Or Security For Electrophotography (AREA)

Abstract

PURPOSE:To obtain the copied matter of high contrast corresponding to the originals with a simple constitution by performing the detection of the ground color density of the original through selective changing-over of plural photo detectors. CONSTITUTION:Plural photo sensors 14a thru 14e which detect the ground color density of the original 1 are disposed near a light source 2 in the direction perpendicular to the conveying direction of the original 1. These photo sensors 14a thru 14e consist of photo diodes, etc. and the detection signals thereof are selectively extracted by way of a select switch 15. The selected signals are amplified to the specified levels by a preamplifier 16, after which they are supplied to a density regulator 17, by which the detection of the ground color density of the original 1 is accomplished. The density regulator 17 performs the regulation of copying density through such things as regulation of the illuminance of the light source 2 and the development of bias voltage of a developing part 8 according to the results of the detection. In this way, the copied matter of high contrast may be obtained with the simple constitution.
JP15028578A 1978-12-05 1978-12-05 Electrophotographic copier Pending JPS5576361A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15028578A JPS5576361A (en) 1978-12-05 1978-12-05 Electrophotographic copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15028578A JPS5576361A (en) 1978-12-05 1978-12-05 Electrophotographic copier

Publications (1)

Publication Number Publication Date
JPS5576361A true JPS5576361A (en) 1980-06-09

Family

ID=15493627

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15028578A Pending JPS5576361A (en) 1978-12-05 1978-12-05 Electrophotographic copier

Country Status (1)

Country Link
JP (1) JPS5576361A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57201269A (en) * 1981-06-05 1982-12-09 Fuji Xerox Co Ltd Controller for quantity of light of copying machine
JPS58214144A (en) * 1982-06-08 1983-12-13 Canon Inc Original density detector of variable power type copying machine
JPS60162241A (en) * 1984-01-31 1985-08-24 Minolta Camera Co Ltd Automatic exposure controller of microfilm reader/printer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57201269A (en) * 1981-06-05 1982-12-09 Fuji Xerox Co Ltd Controller for quantity of light of copying machine
JPS58214144A (en) * 1982-06-08 1983-12-13 Canon Inc Original density detector of variable power type copying machine
JPS60162241A (en) * 1984-01-31 1985-08-24 Minolta Camera Co Ltd Automatic exposure controller of microfilm reader/printer

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