JPS57114161A - Exposure volume controller of copying machine - Google Patents

Exposure volume controller of copying machine

Info

Publication number
JPS57114161A
JPS57114161A JP21881A JP21881A JPS57114161A JP S57114161 A JPS57114161 A JP S57114161A JP 21881 A JP21881 A JP 21881A JP 21881 A JP21881 A JP 21881A JP S57114161 A JPS57114161 A JP S57114161A
Authority
JP
Japan
Prior art keywords
photoreceptor
light
exposure
copying machine
volume controller
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
JP21881A
Other languages
Japanese (ja)
Inventor
Yasushi Furuichi
Kiyoto Nagasawa
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.)
Ricoh Co Ltd
Original Assignee
Ricoh 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 Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP21881A priority Critical patent/JPS57114161A/en
Publication of JPS57114161A publication Critical patent/JPS57114161A/en
Pending 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
    • G03G15/041—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 variable magnification

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

PURPOSE:To realize the control of the exposure with high accuracy and high stability by means of an inexpensive photodetector available in the market, by using a quantity of light detecting means having the spectral sensitivity that substantially cuts the infrared rays. CONSTITUTION:A filter that cuts the >=700mmu beams down to <=5% for instance is put in front of a photodetector PD as a light receiver 4 in an exposure controller 5 of a copying machine. As a result, the stable quantity of light can be obtained to a photoreceptor and under any environment. Accordingly it is unnecessary to set the photoreceptor at the same spectral sensitivity as the photoreceptor. Then the quantity of light can be simply controlled by cutting the long wavelength light having no sensitivity to the photoreceptor by a filter. In such way, the exposure can be controlled with high accuracy and high stability by means of an inexpensive photodetector available in the market.
JP21881A 1981-01-05 1981-01-05 Exposure volume controller of copying machine Pending JPS57114161A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21881A JPS57114161A (en) 1981-01-05 1981-01-05 Exposure volume controller of copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21881A JPS57114161A (en) 1981-01-05 1981-01-05 Exposure volume controller of copying machine

Publications (1)

Publication Number Publication Date
JPS57114161A true JPS57114161A (en) 1982-07-15

Family

ID=11467816

Family Applications (1)

Application Number Title Priority Date Filing Date
JP21881A Pending JPS57114161A (en) 1981-01-05 1981-01-05 Exposure volume controller of copying machine

Country Status (1)

Country Link
JP (1) JPS57114161A (en)

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