| 摘要 |
PURPOSE:To obtain an image of proper density by adding a blackened mixture of >=2 kinds of nonblack coloring materials reflecting or transmitting infrared light so as to correctly detect the toner concn. of a developer prepared by mixing a toner with a carrier. CONSTITUTION:In order to detect easily and correctly the toner concn. of a developer consisting of a black toner and a carrier, to the toner is added a blackened mixture of >=2 kinds of nonblack coloring materials reflecting or transmitting infrared light such as 4pts.wt. brown azo dye and 1pt.wt. blue phthalocyanine dye. By measuring the spectral diffusion reflectance of the resulting developer in the infrared region, the black toner density is correctly detected because the light reflection of the carrier is small in the infrared region. Thus, a fresh toner is supplied so that the density of an image is made proper. |
