| 摘要 |
PURPOSE:To reduce an irregularity in the density of an image after fixation and variation in density with the number of prints by making variation in fixed image density much less than variation in unfixed image density. CONSTITUTION:Optical reflection density in an unfixed state before heating is set to d1*=1.31 based on the maximum value d2*=1.26 of fixed image density. At this time, d1=d1 in the range of the resolution of the optical reflection density and the unfixed image density of a recording device is normal reflected density and varies to variation width of about 0.2-0.3. If the unfixed image density varies to variation width d1H-d1L=0.28 of d1L=1.17-d1H=1.45 while d1=1.31 is the maximum degree, the variation width of fixed image density is a=0.02. It is said that the variation width of the print image density of a conventional recording device is about 0.1-0.15 as optical reflection density and the minimum value of optical reflection density difference which can be discriminated by a human being is 0.02. Therefore, variation width of the fixed image density is extremely small. |
