| 摘要 |
<p>This device holds an optical aid such as a pair of binoculars at a user's eyes, without the support of the user's arms and hands. The user applies only small upward or downward pilot force to a point on the device well below the optical aid. To change or maintain the vertical position of the optical aid the user need not even raise the hands above the chest. The device is mechanically articulated so that, guided only by the pilot force which is simply upward or downward, the optical aid can track and follow the user's head and eyes in both position and angle as the user shifts his view up and down between the horizon and the zenith. The device is attached to or worn by the user, while springs or counterbalancing support the weight from the user's torso, to free the user's arms and hands.</p> |
