Polychromatic printer

Abstract

Abstract PURPOSE:To improve the quality of colors with compact mechanism by detecting the concentration of toner marks recorded on a form for plural different colors, and controlling the toner of a developing device of each color according to the detected density. CONSTITUTION:A photosensitive drum 1 is destaticized during rotation shown by an arrow, and cleaned and then charged electrostatically. A laser control circuit 15 forms a latent image on the photosensitive drum with the 1st-the 3rd laser optical systems 5-7, and the image is developed at every time by the 1st-the 3rd developing devices 8-10 in the other of, for example, cyan C, magenta M, and yellow Y. A transfer part 13' transfers toner of C, M, and Y to a form 13. The sample marks 14 are recorded at respective positions on the form 13 for the respective colors under the control of a data recording processing part 16. Those marks are detected by a light source 17 and a sensor 18 to detect their levels, and a toner concentration control part 20 outputs signals 21C-21Y for controlling the toner concentration of the respective developing devices according to the detected concentration. consequently, the quality of the colors are improved with the simple mechanism.

Inventors

• 👤 Yoji Hoki
• 👤 陽治 伯耆
• 👤 Toshio Fukushima
• 👤 俊夫 福島

Bibliographic Details