対物レンズアクチュエータのモーダルモデルと高次減衰の簡易評価法

概要

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Modal analysis is investigated in the frequency bands between several hundreds and several thousands hertz, which takes account of phase disturbances in the frequency response functions (FRFs) of objective lens actuators for optical disc, CD and CD-ROM drives. A modal model which includes inertia restraint system in the main mode and dynamic response in the higher mode is developed. A new calculation method for modal damping in the higher mode which uses only phase disturbance, is also proposed. This method is explained by the simple equation ζ=Δω/2ω_i which is very similar to that of the half-power bandwidth method in SDOF. We call it the half-phase bandwidth method. The error is within +20% when phase disturbance is less than 60 degrees. This method is also extended to a system with residual flexibility.
社団法人日本機械学会の論文
1994-08-25