| 摘要 |
In a rotary damper device and a sun visor attaching apparatus using the same, a damping force works in one way. The rotary damper device includes a case, a rotor and a viscous fluid. The rotor is rotatably held in the case and connected to a shaft. The viscous fluid is sealed in the case. The rotor includes a rotary vane, a through-hole passing through the vane, and a valve. The rotary vane is used to agitate the viscous fluid. The valve opens the through-hole when the shaft is rotated in one direction and closes the through-hole when the shaft is rotated in the other direction.
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