Image forming device

Abstract

Abstract PURPOSE:To keep constant the characteristic of reproducing pseudo half tone by controlling development conditions in accordance with output values corresponding to two toner images with different recorded area ratios of a density detection means. CONSTITUTION:A photosensor 35 detecting the density of a reference toner image on an image carrier is made up with a light emitting element and a light receiving element, and reads the reflection densities of reference toner images C1-C4 in yellow, cyan, magenta and black. When the density of each color reference toner image with a recorded area rate of 100% is below each preset reference value, a control part outputs a toner replenishment signal. When the density with a recorded area rate of 50% is not within a fixed range, a bias is adjusted. This adjustment is done by referring to a table which associates the deviation of the density with a bias value. Thus, by adjusting the development conditions, the max. density and the gradation reproducing characteristic can be kept constant.

Inventors

• 👤 Hisafumi Shoji
• 👤 尚史 庄司
• 👤 Satoru Haneda
• 👤 羽根田　哲
• 👤 Kunihisa Yoshino
• 👤 吉野　邦久

Bibliographic Details