IMAGE FORMING APPARATUS, RECONSTRUCTING METHOD OF IMAGE FORMING APPARATUS, MANUFACTURING METHOD AND TONE QUALITY EVALUATION METHOD OF THE IMAGE FORMING APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of mitigating an unpleasant feeling due to a noise generated from the apparatus, to provide a reconstructing method, a manufacturing method and a tone quality evaluation method of the apparatus.;SOLUTION: A probability P (z is logit) calculated by the following expression (a) by using acoustic physical quantity such as a sound pressure level value, a loudness value, a sharpness value, a tonality value and an impulsiveness value obtained from the sound generated by the image forming apparatus at image formation, gathered in a sound gathering position one meter away from the end face of the image forming apparatus for forming an image on an image forming sheet and an output value (ppm) of the sheet (A4 size longitudinal direction) per minute is set so as to satisfy the following condition (b), the expression (a): P=1/(1+exp(-z))z=+A×(sound pressure level)+B×(loudness)+C×(sharpness)+D×(tonality)+E×(impulsiveness)+F [provided that A to F are within prescribed numerical values]. The condition (b): P≤0.2646Ln(ppm)-0.5879[provided that 14≤ppm≤65].;COPYRIGHT: (C)2005,JPO&NCIPI