JPS5740276A - Exposure stabilizing device - Google Patents

Exposure stabilizing device

Info

Publication number
JPS5740276A
JPS5740276A JP11534980A JP11534980A JPS5740276A JP S5740276 A JPS5740276 A JP S5740276A JP 11534980 A JP11534980 A JP 11534980A JP 11534980 A JP11534980 A JP 11534980A JP S5740276 A JPS5740276 A JP S5740276A
Authority
JP
Japan
Prior art keywords
light source
optical output
exposure
alarm
giving
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
JP11534980A
Other languages
Japanese (ja)
Inventor
Kiyoto Nagasawa
Masumi Ikesue
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 JP11534980A priority Critical patent/JPS5740276A/en
Priority to DE19813133168 priority patent/DE3133168C2/en
Publication of JPS5740276A publication Critical patent/JPS5740276A/en
Pending 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
    • G03B27/00—Photographic printing apparatus
    • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus

Abstract

PURPOSE:To prevent generation of a nonstabilizing state without giving to a lighting device a superfluous quality, by controlling a light source by detecting an optical output of the light source, and also generating an alarm in case when a variation of the optical output exceeds a prescribed value. CONSTITUTION:An optical output of a light source 2 such as a fluorescent lamp, etc. is detected by a photodiode 4, etc., and a dimming stabilizer 20 is controlled through a controlling circuit 10 which is equipped with an operational amplifier, etc. As a result, a current to be applied to the light source 2 is controlled and the extent of exposure of an original 1 is stabilized. On the other hand, the extent of detection of the optical output by the diode 4 is compared with a prescribed reference value, and when it gets out of the control range of the stabilizer 20, an alarm is generated in accordance with a comparison output, and an occurrence of the nonstabilizable state of the exposure is prevented without giving to the lighting device a superfluous quality.
JP11534980A 1980-08-23 1980-08-23 Exposure stabilizing device Pending JPS5740276A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP11534980A JPS5740276A (en) 1980-08-23 1980-08-23 Exposure stabilizing device
DE19813133168 DE3133168C2 (en) 1980-08-23 1981-08-21 Device for keeping constant the luminous flux supplied by a fluorescent tube of a fiber optic for a copier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11534980A JPS5740276A (en) 1980-08-23 1980-08-23 Exposure stabilizing device

Publications (1)

Publication Number Publication Date
JPS5740276A true JPS5740276A (en) 1982-03-05

Family

ID=14660317

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11534980A Pending JPS5740276A (en) 1980-08-23 1980-08-23 Exposure stabilizing device

Country Status (1)

Country Link
JP (1) JPS5740276A (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4890536A (en) * 1972-03-03 1973-11-26
JPS5182630A (en) * 1975-01-16 1976-07-20 Minolta Camera Kk
JPS5473638A (en) * 1977-11-25 1979-06-13 Ricoh Co Ltd Copying machine capable of displaying contents of trouble

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4890536A (en) * 1972-03-03 1973-11-26
JPS5182630A (en) * 1975-01-16 1976-07-20 Minolta Camera Kk
JPS5473638A (en) * 1977-11-25 1979-06-13 Ricoh Co Ltd Copying machine capable of displaying contents of trouble

Similar Documents

Publication Publication Date Title
JPS5694372A (en) Exposure control device
JPS5740276A (en) Exposure stabilizing device
JPS56106259A (en) Control device for quantity of light
JPS56107264A (en) Controller for quantity of light
JPS5783079A (en) Driving method of semiconductor laser
JPS5740277A (en) Exposure control device of copying machine
JPS5722265A (en) Exposure control device for copying machine
JPS57105624A (en) Safety device for combustion equipment
JPS56100343A (en) Photoelectric type smoke sensor
JPS5469268A (en) Emergency lamp system
JPS57119311A (en) Compensating circuit for signal detector
JPS5650585A (en) Indicator
JPS57144532A (en) Flash device
JPS5563895A (en) Light output stabilization circuit
JPS54162496A (en) Driver circuit of photo semiconductor device
JPS5518645A (en) Automatic exposure control type lighting device of copying machine
JPS5491398A (en) Detector for duble insertion of paper currency
JPS6439839A (en) Semiconductor laser driving circuit
DE3371733D1 (en) Equipment for the automatic switching and control of room illumination
JPS5725164A (en) Firing circuit device
JPS5545050A (en) Light source device for image exposure
JPS6459881A (en) Solid-state laser stabilizer
JPS54124930A (en) Photo sensor system
JPS5550679A (en) Laser drive current control system
JPS54146356A (en) Apparatus for automatically controlling luminous intensity of head light