JPS57138663A - Copying device - Google Patents

Copying device

Info

Publication number
JPS57138663A
JPS57138663A JP2393481A JP2393481A JPS57138663A JP S57138663 A JPS57138663 A JP S57138663A JP 2393481 A JP2393481 A JP 2393481A JP 2393481 A JP2393481 A JP 2393481A JP S57138663 A JPS57138663 A JP S57138663A
Authority
JP
Japan
Prior art keywords
peak
pulse
power source
light quantity
lamp
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
JP2393481A
Other languages
Japanese (ja)
Inventor
Yasuo Sawada
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 JP2393481A priority Critical patent/JPS57138663A/en
Publication of JPS57138663A publication Critical patent/JPS57138663A/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
    • 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

Abstract

PURPOSE:To set properly picture forming conditions, by reading a digital output through a photosensor by a pulse, which is synchronized with the peak position of the light quantity of a light source for exposure driven by an AC power source, to control a set value. CONSTITUTION:A part of the exposing light for an original 8 from a halogen lamp 6 driven by a commercial power source 20, a lamp regulator 19, etc. is sent by a mirror 15 and is detected by a photosensor 16. This detection output is applied to an operation processing device 22 through an A/D converter 18. Meanwhile, a pulse generating circuit 21 detects the peak of the power source 20 to generate a pulse cynchronized with this peak, and the device 22 is controlled synchronously with the peak of the pulsating light quantity of the lamp 6 by this pulse to read out the output signal of the converter 18, and a bias voltage control device 24 and the regulator 19, etc. are controlled to set picture forming conditions properly. As the result, a high-quality copy without dirt on the ground is obtained without the influence of pulsation of the light quantity of the light source for exposure.
JP2393481A 1981-02-20 1981-02-20 Copying device Pending JPS57138663A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2393481A JPS57138663A (en) 1981-02-20 1981-02-20 Copying device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2393481A JPS57138663A (en) 1981-02-20 1981-02-20 Copying device

Publications (1)

Publication Number Publication Date
JPS57138663A true JPS57138663A (en) 1982-08-27

Family

ID=12124351

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2393481A Pending JPS57138663A (en) 1981-02-20 1981-02-20 Copying device

Country Status (1)

Country Link
JP (1) JPS57138663A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS626735U (en) * 1985-06-26 1987-01-16
JPH0266540A (en) * 1988-08-31 1990-03-06 Sharp Corp Automatic exposure controller for copying machine
JPH0312644A (en) * 1989-06-09 1991-01-21 Sharp Corp Automatic exposure controller

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS626735U (en) * 1985-06-26 1987-01-16
JPH0266540A (en) * 1988-08-31 1990-03-06 Sharp Corp Automatic exposure controller for copying machine
JPH07111542B2 (en) * 1988-08-31 1995-11-29 シャープ株式会社 Automatic exposure control device for copiers
JPH0312644A (en) * 1989-06-09 1991-01-21 Sharp Corp Automatic exposure controller
JPH0820685B2 (en) * 1989-06-09 1996-03-04 シャープ株式会社 Automatic exposure control device

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