Patent ID: 7631431

Claim:
An eyeglass frame measurement apparatus comprising: a measurement unit which includes a tracing stylus to be inserted into a groove of a rim of an eyeglass frame, a moving mechanism for moving the tracing stylus along the groove of the rim, and a detector for detecting movement of the tracing stylus, and obtains three-dimensional data of the groove of the rim based on a detected result by the detector; and a holding unit which includes upper and lower sliders for positioning the frame with left and right clamp pins for clamping the rim, and holds the frame fixedly, wherein each of the upper and lower sliders is formed with a protruding portion which is disposed on at least one of left and right sides of each of the clamp pins and protrudes toward a reference line lying between the sliders, and each of the sliders is prevented from moving toward the reference line by bringing the rim into contact with the protruding portion.