Title:
METHOD AND DEVICE FOR FORMING TORUS LENS
Document Type and Number:
Japanese Patent JPS6190864
Kind Code:
A
Abstract:
@ Elliptical error in the generating of toric lenses is substantially eliminated, thereby reducing the time and cost of the production of such lenses. A cup-shaped cutter wheel is swept to cut the lens in a plurality of cuts, suitably three cuts. During each cut the inclination of the cutter wheel and its displacement from the lens in a direction along the optical axis of the lens are changed. Each subsequent cut reduces the elliptical error left after the preceding cut. A computer controller, including a memory storing a table of values of angular orientations and displacements of the cutter wheel with respect to the lens for each of a series of cross curve powers (Dc) which is desired to accompany each of a series of base curve powers (DB), is used to control the positioning of the cutter unit mounted on the headstock and the tailstock on which the lens is mounted for cutting so as to cut both convex (plus) and concave (minus) toric lenses with minimal elliptical error in the cross curve thereof.
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Inventors:
ROBAATO ESU KURAKUSUTON
Application Number:
JP21928185A
Publication Date:
May 09, 1986
Filing Date:
October 03, 1985
Export Citation:
Assignee:
ROBAATO ESU KURAKUSUTON
International Classes:
B24B13/00; B24B13/04; (IPC1-7): B24B13/00
Attorney, Agent or Firm:
Naoki Fukumura (1 person outside)