Method and system for generating wide-range toric lenses

Details Method and system for generating wide-range toric lenses Method and system for generating wide-range toric lenses

1988-09-12

1990-03-20

Schmidt, Frederick R.

Abrasive tool making process, material, or composition

Impregnating or coating an abrasive tool

5116571, 5116574, 51105LG, B24B 1306, B24B 4910

Patent

active

049089978

ABSTRACT:
A method and system for generating a lens by grinding a lens blank with a tool in a working position calls for a diamond tool to be disposed only angularly, the lens being moved in an X,Y relationship so that the relative cutting position is properly maintained. The angular disposition and X,Y relationship of the tool and the lens are pre-calculated by a computer, and the digital data thus obtained are converted to analog data for controlling a servo system. In accordance with the invention, when a certain range of curves is entered via a digital keyboard, a computation is made by computer to determine if an interference between the spindle holding the diamond tool and lens will exist, or if an interference between the lens and a chuck will exist. If an interference will exist, the chucked lens is caused to rotate around the optic axis by precisely 180.degree., the lens is generated halfway through, the chucked lens is then retracted a small amount to provide clearance, and the chucked lens is then returned to its original position so that the second half of the lens may be generated. Other features include a linear position detection circuit for detecting the linear position of the chucked lens and an initiation circuit for initiating rotation of the chucked lens.

REFERENCES:
patent: 3492764 (1970-02-01), Dalton
patent: 3958492 (1976-05-01), Curless
patent: 4493168 (1985-01-01), Field, Jr.

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