Login| Sign Up| Help| Contact|

Patent Searching and Data


Title:
CONTROL DEVICE FOR COPYING MACHINE
Document Type and Number:
Japanese Patent JPS6037571
Kind Code:
A
Abstract:

PURPOSE: To maintain always a copied image at adequate density by detecting the quantity of the light reflected from an original and the surface condition of a photosensitive body and controlling or limiting separately copying conditions by the two detection signals.

CONSTITUTION: The signal from a potenstial sensor which detects the potential of a photosensitive body is inputted to a terminal P1 and is inverted and amplified by an operational amplifier Q5 via a MIller inregrator consisting of a resistor R8, and operational amplifier Q3 and a capacitor C1. The light reflected from an original is detected via a photodetecting sensor 9 by a Miller integrator consisting of a resistor R4, an operational amplifier Q3 and a capacitor C1. If the output voltage from the Q5 is smaller than the output voltage from the Q2, the exposure of an exposing lamp is controlled by the output voltage from the Q5 and if the output voltage from the Q5 is larger than the output voltage from the Q2, the exposure is limited by the output voltage from the Q2. The controlled and limited voltages are inputted from a terminal P4 to a control circuit for quantity of light. The copied image is thus always maintained at the adequate density.


Inventors:
TOMOSADA MASAHIRO
MIYATA MASANORI
ADACHI HIDEKI
KASUYA YUKIO
Application Number:
JP1983000145122
Publication Date:
February 26, 1985
Filing Date:
August 10, 1983
Export Citation:
Click for automatic bibliography generation   Help
Assignee:
CANON KK
International Classes:
G03G21/00; G03F7/20; G03G15/00; G03G15/04; (IPC1-7): G03G15/00; G03G15/04