Menicon Co., Ltd.

Koichi Inada

Kenshiro Hattori

Nakakatsu Takeno

Takayuki Yokoi

A holding device for cutting a toric lens includes a chuck member which holds the lens workpiece, with a rotation and guide assembly provided such that an axis of the chuck member moves along a line perpendicular to the axis of rotation. The chuck member is held by a chuck support member, and the chuck support member includes guide ends which move along an inner periphery of a guide hole of a guide member. The guide hole has a center axis which is eccentric with respect to a rotation axis in a direction orthogonal to the rotation axis, such that as the guide ends of the chuck support member move along the inner periphery of the guide hole, the chuck member rotates while the chuck axis moves along a line which is orthogonal to the rotation axis.

Holding device for cutting a toric lens

An apparatus and method for forming aspherical lenses is provided in which a holder holds and rotates a predetermined lens workpiece, with a rotation detecting device provided for detecting the rotation angle of the workpiece. The cutting bit is mounted to swing about an axis perpendicular to the axis of rotation of the workpiece holder, with the cutting bit holder also linearly reciprocated. The swing angle and linear extent of the cutting bit or cutting bit holder are also detected, such that the swinging and reciprocating movement can be coordinated and controlled. The method and apparatus is particularly advantageous in forming aspherical and irregular lens shapes.

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Seki, Japan

Koichi Inada