IMAGE FORMING DEVICE

• Main Author: KANEKO SHUZO
• Format: Patent
• Language: English
• Published: 20.03.1986
• Subjects: CINEMATOGRAPHY; CORRECTION OF TYPOGRAPHICAL ERRORS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; LINING MACHINES; MAGNETOGRAPHY; PERFORMING OPERATIONS; PHOTOGRAPHY; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRINTING; SELECTIVE PRINTING MECHANISMS; STAMPS; TRANSPORTING; TYPEWRITERS

PURPOSE:To prevent the variance of the density of display images or the like to obtain stable images by detecting an electric current value supplied to a toner and determining the signal intensity modulated with a picture signal or the DC voltage value applied across a photosensitive body substrate and the toner in accordance with the detected value. CONSTITUTION:The current value supplied to the toner is detected by a current detector 23 before actual display image formation, and servo is applied to a DC power source 21 or a laser driver 22 through a control part 24 or 25 in accordance with the difference between the detected value and a stored correct current value. The applied voltage across a photosensitive body 1 and a developing sleeve 4 or the output of a semiconductor laser 7 is controlled. This current detection is performed in an overall black writing area 30. For example, a signal generator which generates an overall black writing signal is provided in the device itself, and the signal which turns on continuously the laser 7 is outputted from this generator to perform overall black writing.