Patent ID: 7436523

Claim:
An eyeglass frame measurement apparatus for measuring a shape of a rim of an eyeglass frame, comprising: a holding unit that holds the frame in a predetermined state; a rotational base arranged to be rotatable with respect to the holding unit; a tracing stylus to be inserted into an inner groove of the rim, the tracing stylus being arranged on the rotational base to be movable in a radius direction and a warpage direction of the rim; a light-projection-and-receiving unit that includes a light-emitting portion and a two-dimensional light-receiving sensor capable of selecting a pixel which receives light from the light-emitting portion; a slit plate interposed between the light-emitting portion and the sensor; and an arithmetic operation portion that obtains a three-dimensional shape of the rim by detecting, based on a result of receipt of the light by the sensor, movements of the tracing stylus inserted in the inner groove of the rim along the radius vector direction and the warpage direction in response to rotation of the rotational base, wherein one of the light-projection-and-receiving unit and the slit plate is fixedly arranged on the rotational base, and the other is arranged to be movable along with the tracing stylus, wherein the sensor includes a first light-receiving line and a second light-receiving line which are not parallel to each other and for which the pixel for receiving the light from the light-emitting portion is selectively set, wherein the slit plate includes a first slit which permits passage of the light to be received by the first light-receiving line and is not parallel to the first light-receiving line, and a second slit which permits passage of the light to be received by the second light-receiving line and is not parallel to the second light-receiving line, and wherein the arithmetic operation portion detects the movements of the tracing stylus in the radius direction and the warpage direction based on a result of receipt of the light by the first and second light-receiving lines.