Method for producing ophthalmic lenses and other shaped...

Details Method for producing ophthalmic lenses and other shaped... Method for producing ophthalmic lenses and other shaped...

2008-01-28

2009-11-10

Stultz, Jessica T (Department: 2873)

Optics: eye examining, vision testing and correcting

Spectacles and eyeglasses

Ophthalmic lenses or blanks

C351S174000, C451S043000, C451S042000, C451S255000

Reexamination Certificate

active

07614742

ABSTRACT:
The invention concerns a method for producing ophthalmic lenses that uses plastic blanks in the form of flat, round discs. The outer edge of said plastic blanks is clamped and the desired final surface geometry and surface quality of the front faces of the lens are subsequently produced by a machining process using grinders and/or lathes and by smoothing and polishing processes. During machining, a thicker annular region is retained on the outer circumference of the workpiece. The annular region clamps or arranges the workpiece during machining and transport operations and stabilizes the lens for additional machining. Shaped pieces for identifying the machining axes are attached to the annular region. The lens is provided with fine markings to characterize the lens that has been produced, with the lens then being separated from the region.

REFERENCES:
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patent: 4113224 (1978-09-01), Clark et al.
patent: 4733502 (1988-03-01), Braun
patent: 6071111 (2000-06-01), Doke et al.
patent: 6227952 (2001-05-01), Diehl et al.
patent: 6568990 (2003-05-01), Siders et al.
patent: 2005/0020186 (2005-01-01), Schneider et al.
patent: 40 03 002 (1991-05-01), None
patent: 100 36 158 (2002-05-01), None
patent: 0 896 875 (1999-02-01), None
patent: WO 02/037168 (2002-05-01), None

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