DISTURBANCE ESTIMATION OBSERVER, ANGULAR DISPLACEMENT CONTROL DEVICE, IMAGE FORMING APPARATUS, IMAGE READER AND RECORDING MEDIUM

摘要

PPROBLEM TO BE SOLVED: To solve the problem that the operation range of a disturbance estimation observer is considerably limited. PSOLUTION: This disturbance estimation observer includes: a disturbance estimation part 7 for estimating a disturbance and a plurality of different primary low-pass filters 8, 9 for limiting the operation range of disturbance estimation. The observer is deformed into a form having no differential term by the disturbance estimating part 7 and the plurality of different primary low-pass filters 8, 9. PCOPYRIGHT: (C)2004,JPO