| 摘要 |
PURPOSE:To measure a high speed phenomenon with high resolution by containing a moving body having a scanning mirror, a dynamically balancing mass body connected to said moving body with an elastic body and suringing synchronously with a scanning of the moving body while shifting the phase by pi radian, and a driving scanning mechanism. CONSTITUTION:The moving body 7 containing the scanning mirror 8 swings by revolution of a motor 14 from side to side with nearly strict simple harmonic motion on a guiding shaft 22 fixed to a base 11, with a scanning distance set previously by a crank piston mechanism composed of a connecting rod 16 and an eccentric cam 15 attached to a shaft 17 of the motor 14. If the body 7 is swung and scanned with a secondary natural vibration type frequency of a vibrating system composed of a masses M1 and M2 of the body 7 and the dynamically balancing mass body 9 selected respectively to satisfy an equation and an elastic body of a coil spring 10 connecting both bodies 7, 9, only a compensation for a loss due to friction and viscosity, etc. is needed for a driving propelling force necessary for the driving scanning mechanism, and the base 11 of a high speed mirror scanning mechanism is affected by only extremely small counter force against the driving propelling force. |
