Adjusting structure in an aspheric lens grinding apparatus

Claim 1

In a lens grinding apparatus which is particularly suited for grinding aspheric lenses and which includes an oscillating means for angularly oscillating about a given oscillating axis a template which determines the curvature of the ground surface of a lens, a rotary shaft means for carrying and rotating a lens which is to be ground and having a shaft axis perpendicular to the oscillating axis, a rotary grinding means for placing a grinding wheel in engagement with the lens surface which is to be ground and having a grinding axis parallel to the shaft axis, a tracing means for engaging the template and tracing the oscillatory movement thereof, a transmission means connected between the tracing means and grinding means for moving the grinding means along said grinding axis in response to movement of the tracing means by template with the movement of the grinding means along its axis having a given fractional relationship with respect to the extent of movement of the tracing means by the template, a support means supporting the shaft means for rotation about said shaft axis, and a mounting means mounting the support means on the oscillating means for movement therewith about the oscillating axis, so that while the lens which is to be ground is rotated about the shaft axis and engaged by the grinding wheel of the grinding means it is simultaneously oscillated about the oscillating axis, the improvement wherein the support means has a support axis parallel to but spaced from the shaft axis while the mounting means mounts the support means for adjustable turning movement about its support axis so that by turning the support means about its support axis with respect to said mounting means the shaft axis can be adjusted so as to have a location intersecting the oscillating axis.