EP 2529886 A1 20121205 - LENS SPHERICAL SURFACE GRINDING METHOD USING DISH-SHAPED GRINDSTONE
Title (en)
LENS SPHERICAL SURFACE GRINDING METHOD USING DISH-SHAPED GRINDSTONE
Title (de)
VERFAHREN ZUM SCHLEIFEN EINER SPHÄRISCHEN LINSENFLÄCHE MIT EINEM TELLERFÖRMIGEN SCHLEIFSTEIN
Title (fr)
PROCÉDÉ DE MEULAGE DE SURFACE SPHÉRIQUE DE VERRE D'OPTIQUE UTILISANT UNE MEULE EN FORME D'ASSIETTE
Publication
Application
Priority
JP 2010000563 W 20100129
Abstract (en)
A spherical core type lens grinding device (1) performs an operation wherein a dish-shaped grindstone (8) provided with a spherical grindstone surface (8a) which is equipped with diamond abrasive grains, is pressed against a surface-to-be-ground (7a) of a lens blank (7) to be ground, and wherein the dish-shaped grindstone (8) is rotated and is simultaneously swung, resulting in said surface-to-be-ground (7a) being ground to a spherical surface. In an initial-stage grinding process, grinding is performed at first processing pressure and first rotational speed. In an intermediate-stage grinding process, grinding is performed at second processing pressure and second rotational speed. In a last-stage grinding process, grinding is performed at third processing pressure and third rotational speed. The second processing pressure is a pressure at which the spherical grindstone surface (8a) can bite into the lens blank (7). The biting amount of the dish-shaped grindstone (8) is obtained from the hardness of the lens blank (7) and the contact area between the surface-to-be-ground (7a) and the spherical grindstone surface (8a). The second processing pressure is calculated from the biting amount thus obtained. A coarse grinding process and a precision grinding process are unified into a single process. Therefore, the surface of the lens blank can be ground to a spherical surface by using only a dish-shaped grindstone used for precision grinding.
IPC 8 full level
B24B 13/04 (2006.01); B24B 13/02 (2006.01)
CPC (source: EP US)
B24B 13/02 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
DOCDB simple family (publication)
EP 2529886 A1 20121205; EP 2529886 A4 20150805; EP 2529886 B1 20160420; CN 102725104 A 20121010; CN 102725104 B 20150701; HK 1174871 A1 20130621; JP 5453459 B2 20140326; JP WO2011092748 A1 20130523; KR 101584265 B1 20160111; KR 20120123082 A 20121107; TW 201125680 A 20110801; TW I415709 B 20131121; US 2012289127 A1 20121115; WO 2011092748 A1 20110804
DOCDB simple family (application)
EP 10844519 A 20100129; CN 201080062578 A 20100129; HK 13102050 A 20130218; JP 2010000563 W 20100129; JP 2011551589 A 20100129; KR 20127020725 A 20100129; TW 99105673 A 20100226; US 201013575711 A 20100129