Abrading – Abrading process – Glass or stone abrading
Reexamination Certificate
2001-04-02
2002-12-24
Wilson, Lee (Department: 3723)
Abrading
Abrading process
Glass or stone abrading
C451S005000, C451S008000, C451S255000, C451S256000
Reexamination Certificate
active
06497614
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a lens periphery edge processing apparatus for grinding a periphery edge of an objective lens to a lens shape such as a lens frame shape or mold shape of eyeglasses.
2. Description of the Prior Art
In conventional lens periphery edge processing apparatus, a reference globe is put and held between a lens rotating shafts instead of an objective lens, a carriage supporting the lens rotating shafts is lowered so that the reference globe is contacted with a grindstone, the location of the carriage at this time is detected, corrected data of the inter-shaft distance between a grindstone rotating shaft and the lens rotating shafts are obtained on the basis of the detected location data, and then, the reference globe is detached and the objective lens is put and held between the lens rotating shafts, the inter-shaft distance is corrected on the basis of said corrected data, and the vertical movement of the carriage is controlled, thereby the objective lens is ground.
However, in the above-mentioned conventional lens periphery edge processing apparatus, in case where an initial set is performed whenever the objective lens is processed, the corrected data is obtained by inserting the reference globe to the lens rotating shafts, and then, the reference globe is detached, and the objective lens should be put and held between the lens rotating shafts. Accordingly, there are problems that the operation for inserting or detaching the reference globe is complicated, and considerable time is required.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a lens periphery edge processing apparatus in which the operation or inserting or detaching the reference globe does not need to be inserted or detached.
According to the present invention, there is provided the lens periphery edge processing apparatus comprising lens rotating shafts for putting and holding an objective lens therebetween, a carriage rotatable around a pivot, and a grindstone rotating shaft provided with a grindstone for grinding the objective lens, wherein a reference globe having a predetermined radius is fixed to one of said rotating shafts.
REFERENCES:
patent: 5775973 (1998-07-01), Watanabe
patent: 5895314 (1999-04-01), Kitao et al.
patent: 6019669 (2000-02-01), Kitao et al.
patent: 6220929 (2001-04-01), Mizuno
patent: 6328630 (2001-12-01), Jinbo et al.
patent: 6328635 (2001-12-01), Suzuki et al.
Abe Kazuo
Kobayashi Akio
Koizumi Hiroshi
Nakanishi Michiko
Saito Susumu
Chapman and Cutler
Kabushiki Kaisha TOPCON
Wilson Lee
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