Exposure value control system for copying machines
 An exposure value control system for a copying machine of the narrow slit exposure type in which a fluorescent lamp and a fiber lens array are used as a source of light and an imaging optical system, respectively. This exposure value control system comprises a lighting device for the fluorescent lamp, a manually-adjustable D-C voltage generator, and control means for electrically controlling a lamp current supplied from the lighting device to the fluorescent lamp in dependence upon the D-C voltage from the generator. 
Ricoh Company, Ltd.
G G
G03B G03B
inventional inventional
Hiroshi Kiyoto
Yamada Nagasawa