JPS5722262A - Exposure control device for copying machine - Google Patents

Exposure control device for copying machine

Info

Publication number
JPS5722262A
JPS5722262A JP9677680A JP9677680A JPS5722262A JP S5722262 A JPS5722262 A JP S5722262A JP 9677680 A JP9677680 A JP 9677680A JP 9677680 A JP9677680 A JP 9677680A JP S5722262 A JPS5722262 A JP S5722262A
Authority
JP
Japan
Prior art keywords
circuit
light
original
thyristor
control device
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
JP9677680A
Other languages
Japanese (ja)
Other versions
JPH0448377B2 (en
Inventor
Jiro Suzuki
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 JP9677680A priority Critical patent/JPS5722262A/en
Publication of JPS5722262A publication Critical patent/JPS5722262A/en
Publication of JPH0448377B2 publication Critical patent/JPH0448377B2/ja
Granted 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)
  • Exposure Or Original Feeding In Electrophotography (AREA)
  • Control Of Exposure In Printing And Copying (AREA)

Abstract

PURPOSE:To make a titled device more reliable and improve operativity by controlling the quantity of light of a light source for exposure by electronic phase angle controlling. CONSTITUTION:In the case of an original of a dark ground texture, the reflected light from the original is less, and consequently the output voltage of a photodetecting circuit 36 is low. Then, a trigger pulse generating circuit 37 and a trigger circuit 39 control a thyristor 32 so as to increase its conduction angle, thereby increasing the quantity of light of a fluorescent lamp 2. On the other hand, in the case of an originl of a pale ground texture, the reflected light from the original increases, and consequently the output voltage of the circuit 36 is high. Then, the circuit 37 and the circuit 39 control the thyristor 32 so as to decrease its conduction angle, thereby decreasing the quantity of light of the lamp 2.
JP9677680A 1980-07-15 1980-07-15 Exposure control device for copying machine Granted JPS5722262A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9677680A JPS5722262A (en) 1980-07-15 1980-07-15 Exposure control device for copying machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9677680A JPS5722262A (en) 1980-07-15 1980-07-15 Exposure control device for copying machine

Publications (2)

Publication Number Publication Date
JPS5722262A true JPS5722262A (en) 1982-02-05
JPH0448377B2 JPH0448377B2 (en) 1992-08-06

Family

ID=14174031

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9677680A Granted JPS5722262A (en) 1980-07-15 1980-07-15 Exposure control device for copying machine

Country Status (1)

Country Link
JP (1) JPS5722262A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116729A (en) * 1982-12-24 1984-07-05 Sanpack:Kk Light source for photography
JPS59185320A (en) * 1983-04-07 1984-10-20 Sanpack:Kk Photographing light source for video or the like
JPS60120337A (en) * 1983-12-05 1985-06-27 Sanpack:Kk Light source for photography or video taking
JPH0314634U (en) * 1990-06-26 1991-02-14

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5182630A (en) * 1975-01-16 1976-07-20 Minolta Camera Kk
JPS5548766A (en) * 1978-10-04 1980-04-08 Ricoh Co Ltd Dimming method of copying machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5182630A (en) * 1975-01-16 1976-07-20 Minolta Camera Kk
JPS5548766A (en) * 1978-10-04 1980-04-08 Ricoh Co Ltd Dimming method of copying machine

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59116729A (en) * 1982-12-24 1984-07-05 Sanpack:Kk Light source for photography
JPS59185320A (en) * 1983-04-07 1984-10-20 Sanpack:Kk Photographing light source for video or the like
JPS60120337A (en) * 1983-12-05 1985-06-27 Sanpack:Kk Light source for photography or video taking
JPH0314634U (en) * 1990-06-26 1991-02-14
JPH0535386Y2 (en) * 1990-06-26 1993-09-08

Also Published As

Publication number Publication date
JPH0448377B2 (en) 1992-08-06

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