Rotary actuation mechanism for variable focus spectacles

摘要

A rotary actuation mechanism for variable focus spectacles is disclosed. The spectacles include two variable focus lens units and a bridge therebetween. The actuation mechanism includes a rotary cam rotatably mounted on the bridge, a fingerwheel attached to the rotary cam to rotate it, a cam follower disposed in slidable contact with the peripheral surface of the rotary cam, and two elongated couplers pivotally mounted on the bridge. The peripheral surface of the rotary cam is spiral shaped to transfer the rotation of the rotary cam into a linear, or pivoting, motion of the cam follower. Each coupler has a proximate end in contact with or attached to the cam follower and a distal end coupled to a linkage anchor of a respective lens unit, to transfer the motion of the cam follower into simultaneous pivoting motions of the linkage anchors thereby adjusting the focal lengths of the lens units.

主权项

1. An actuation mechanism for spectacles, the spectacles including two variable focus lens units and a bridge therebetween, each variable focus lens unit having a linkage anchor, the actuation mechanism comprising:
a rotary cam mounted on the bridge and able to rotate around a rotation axis, the rotation axis being stationary with respect to the bridge, the rotary cam having a peripheral surface, wherein at least some points on the peripheral surface have radial distances, as measured from the rotation axis, that are different one from the other; a cam follower disposed in slidable contact with the peripheral surface of the rotary cam; and first and second elongated couplers, each pivotally mounted on the bridge, each having a proximate end engaged with the cam follower and a distal end coupled to the linkage anchor of a corresponding one of the lens units.