Lens block and method of processing lenses

Details Lens block and method of processing lenses Lens block and method of processing lenses

B - Operations, Transporting

24

B

B24B 1/00 (2006.01) B24B 9/14 (2006.01) B24B 13/005 (2006.01) B24B 19/00 (2006.01)

Patent

CA 2301790

A two-piece lens block (10) allows for the rotation of an edged lens blank (5) in order to align the cylinder of the lens blank (5) correctly. The lens block (10) includes a substantially cylindrical base (12) having a first surface (13) facing the lens blank (5) and an opposed second surface (15) with a plurality of driving recesses (14) extending into the base (12) from the second surface (15). A rotatable ring member (22) surrounds the base (12) and includes a mounting surface (24) generally adjacent to the lens blank (5). An edged lens-shaped cavity (26) is provided in the ring member (22) and provides for nearly full surface contact of an attachment alloy (17) with a front surface of the lens blank (5) to alleviated distortion. The two-piece lens block (10) allows edged lens blanks (5) to be surfaced to finished lenses.

L'invention concerne un bloc (10) de lentille en deux pièces permettant de faire tourner une ébauche (5) de verre taillé afin d'aligner correctement le cylindre de l'ébauche (5) de lentille. Le bloc (10) de lentille comporte une base (12) sensiblement cylindrique qui présente une première surface (13) faisant face à l'ébauche (5) de lentille, et une deuxième surface (15) opposée comportant plusieurs évidements (14) de guidage s'étendant dans la base (12) à partir de la deuxième surface (15). Un élément (22) d'anneau tournant entoure la base (12) et comporte une surface (24) de montage généralement adjacente à l'ébauche (5) de lentille. Une cavité (26) en forme de lentille taillée est prévue dans l'élément (22) d'anneau, et assure un contact de surface quasi total entre un alliage (17) de fixation et la surface antérieure de l'ébauche (5) de lentille de manière à obtenir une distorsion réduite. Le bloc (10) de lentille en deux pièces permet d'usiner la surface d'ébauches (5) de lentille taillées pour obtenir des lentilles finies.

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