| 摘要 |
Disclosed is a medical optical devices wherein balance in a horizontal direction can be adjusted by moving the counterweight horizontally, and the balance in a vertical direction can be adjusted by moving whole the retaining link mechanism vertically. Thus only one counterweight is required, which eliminates a need to interlockedly move two counterweights simultaneously as conventionally, so that movement control of a counterweight is easy and a mechanism therefor can be simplified.
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