Patent ID: 6896594

Claim:
A method for grinding lens, comprising at least the steps of: placing a lens on the surface of a polishing pad, wherein the lens has an optical surface and a surface-to-be-grinded corresponding to each other, and the surface-to-be-grinded contacts with the surface of the polishing pad; covering up the lens with a fluid guiding tube, wherein the fluid guiding tube has a fluid inlet and a fluid outlet corresponding to each other, and the fluid outlet situated at the top of the polishing pad for accommodating the lens has a plurality of baffles for contacting with the lateral side of the lens and for holding the lens accordingly; introducing a fluid into the fluid guiding tube through the fluid inlet continuously and simultaneously discharging the fluid from the fluid guiding tube through the fluid outlet, wherein the flow of the fluid follows the normal direction of the optical surface and applies force evenly thereon, so that a tight contact between the surface-to-be-grinded and the polishing pad can be created; moving the polishing pad along with a tangent line of its surface for the surface-to-be-grinded to be grinded; and halting the supply of the liquid and then introducing a gas into the fluid guiding tube through the fluid inlet to dry the optical surface.