Patent ID: 6881125

Claim:
An apparatus for processing a peripheral portion of a spectacle lens in accordance with data describing a shape of a lens frame, the apparatus comprising: a lens support that is freely displaceable towards a tool and comprises a holding shaft supporting the lens so that the lens is freely rotatable, and a detector disposed to detect an angle of rotation of the holding shaft; a positioning member movable to contact with and separate from the lens support, wherein the positioning member restricts displacement of the lens support towards the tool at a position corresponding to a prescribed lens processing amount that is determined based on the rotation angle and data describing a shape of a lens frame at the rotation angle; a means for amplifying a relative displacement that amplifies a relative displacement between the lens support and the positioning member; and a detector disposed to detect, using the amplified relative displacement, when processing conducted at the rotation angle has been completed while the lens support contacts the positioning member, wherein the tool is disposed at a position located directly below the lens support, the lens support being freely displaceable in a vertical direction, and positioning member restricting downward displacement of the lens support in the vertical direction.