Polishing of optical surface of an ophthalmic lens
First Claim
1. A process for polishing of the optical surface of a polycarbonate lens comprising the steps of:
- a) providing an optical lens made of a polycarbonate material having an unground optical surface;
b) providing a rough forming wheel having a radiused edge and rough grinding the optical surface of the lens;
c) providing a polishing wheel having a radiused edge having abrasive particles of a size from about 2 microns to about 60 microns;
d) polishing at least a portion of said optical surface by causing said polishing wheel to contact said portion of said optical surface to be polished at least once and with a coolant flow or an increased coolant flow;
e) causing said polishing wheel to contact said portion of said optical surface to be polished at least once without the use of a coolant flow or with a coolant flow of about 8 ounces per minute or less, wherein a final finish substantially equal to a finished optical surface of the lens is produced.
1 Assignment
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Accused Products
Abstract
A process and apparatus for polishing an optical surface of an ophthalmic lens is provided. The process of the invention comprises the steps of roughing an optical surface of a polycarbonate lens substantially without coolant and passing a polishing wheel of the present invention over the surface of the lens with the use of coolant and then passing the polishing wheel over the surface of the lens substantially without coolant for at least one pass over the portion of the lens edge to be polished. A single abrasive wheel is used for machine polishing of the optical surface of the lens. The wheel is an impregnated wheel of from about 2 to about 60 micron diamond hardness abrasive particles in a concentration of from about 10 to about 200 concentration.
28 Citations
11 Claims
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1. A process for polishing of the optical surface of a polycarbonate lens comprising the steps of:
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a) providing an optical lens made of a polycarbonate material having an unground optical surface; b) providing a rough forming wheel having a radiused edge and rough grinding the optical surface of the lens; c) providing a polishing wheel having a radiused edge having abrasive particles of a size from about 2 microns to about 60 microns; d) polishing at least a portion of said optical surface by causing said polishing wheel to contact said portion of said optical surface to be polished at least once and with a coolant flow or an increased coolant flow; e) causing said polishing wheel to contact said portion of said optical surface to be polished at least once without the use of a coolant flow or with a coolant flow of about 8 ounces per minute or less, wherein a final finish substantially equal to a finished optical surface of the lens is produced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for grinding and polishing a polycarbonate lens, said method comprising the steps of:
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providing an optical lens made of a polycarbonate material having a rough optical surface; providing a rough grinding wheel; grinding the rough optical surface of the lens with the rough grinding wheel without the use of a coolant; providing a polishing wheel for polishing the optical surface of the lens; and polishing the optical surface with the polishing wheel after the step of grinding with the rough grinding wheel by causing the polishing wheel to contact the rough edge surface at least once with a coolant flow, and at least once without a coolant flow or with a decreased coolant flow of less than about 8 ounces per minute.
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Specification