Lens shape measuring apparatus

A lens shape measuring apparatus, comprising:

• a lens fixing jig installed in a lens to be processed to clamp the lens;
• a lens rotation shaft for clamping and rotating the lens to be processed;
• a measuring element abutted on a refracting surface of the lens clamped by the lens rotation shaft;
• a measuring unit for measuring a moving distance of the measuring element in a direction roughly parallel to the lens rotation shaft;
• and
• arithmetic control means for moving a tip of the measuring element relatively in the direction roughly parallel to the lens rotation shaft, measuring a distance from a measuring reference position of the measuring element to an abutting position of the same by the measuring unit, and identifying a shape of the lens fixing jig based on a result of the measurement, wherein the arithmetic control means measures a size of an outer shape of the lens fixing jig.

A lens shape measuring apparatus, comprising:

• a lens fixing jig installed in a lens to be processed to clamp the lens;
• a lens rotation shaft for clamping and rotating the lens to be processed;
• a measuring element having a feeler abutted on a refracting surface of the lens clamped by the lens rotation shaft;
• a measuring unit for measuring a moving distance of the feeler of the measuring element;
• and
• arithmetic control means for identifying a shape of the lens fixing jig,
• wherein the arithmetic control means controls the feeler of the measuring element to move on the lens fixing jig such that the feeler is positioned above the lens fixing jig, controls the moving distance of the feeler of the measuring element such that the feeler is close to said lens fixing jig, and detects whether or not the feeler is abutted on a side face of the lens fixing jig and judges whether or not the lens fixing jig is large or small in diameter to identify the shape of the lens fixing jig.