Patent ID: 8578617

Claim:
An eyeglass frame shape measuring apparatus for measuring a shape of a rim of an eyeglass frame, comprising: a tracing stylus including a tip end configured to be inserted into and move along a groove of the rim to detect a position of the rim in a moving radius direction of the tracing stylus and in a vertical direction perpendicular to the moving radius direction; a tracing stylus shaft including an upper part to which the tracing stylus is attached; a holding unit configured to hold the tracing stylus shaft to be movable in the vertical direction and a direction of the tip end of the tracing stylus, the holding unit including a pressure applying element configured to apply a pressure to the tracing stylus shaft so as to press the tip end of the tracing stylus to the groove of the rim in the direction of the tip end of the tracing stylus; a moving unit configured to two-dimensionally move the holding unit in the moving radius direction; a rotating unit configured to rotate the holding unit around an axis along the vertical direction to change the direction of the tip end of the tracing stylus; a moving radius position detection unit configured to detect a position of the tracing stylus in the moving radius direction, the moving radius position detection unit including at least a first detection unit configured to detect a position of the holding unit in the moving radius direction and a second detection unit configured to detect a position of the tracing stylus in the moving radius direction relative to the holding unit; and a controller configured to obtain a rotating angle of the rotating unit and a position of the holding unit in the moving radius direction at a next measurement position based on a detecting result of the moving radius position detecting unit obtained after starting a measurement, and control the rotating unit and the moving unit based on the obtained rotating angle and the obtained position.