Patent ID: 9114419
Filing Date: 2015-08-25
Classification: B05C

Abstract:
1. A method for dip treatment of an optical element, comprising: dipping said optical element, said optical element having a peripheral edge defined by an edge surface located between a front face and a rear face, the peripheral edge surface defining, in a first plane located completely between said front and rear faces, an arcuate exterior circumferential perimeter of said optical element, wherein while said optical element is being dipped, holding said arcuate exterior circumferential perimeter of said optical element by a holding ring, the holding ring comprising a hoop for draining and encircling a peripheral edge of the optical element, said hoop forming an arc over more than 180° and being provided at each of two ends with an outwardly-directed drip tab pointing away from the held optical element, said hoop further comprising a front edge and a rear edge with an inside circumferential face therebetween, the inside face having an inner arcuate circumferential surface that extends from a first of said drip tab to a second of said drip tab, the inner arcuate circumferential surface defining, in a second plane located completely between said front and rear edges, an opening via which the ring is clipped around the optical element by embracing the peripheral edge of said optical element by more than 180° of the inner arcuate circumferential surface of the holding ring forming a single continuous circumferential contact region along more than 180° of said arcuate exterior circumferential perimeter of said optical element, the inner arcuate circumferential surface thereby exerting continuous linear contact with said peripheral edge over the contact region of more than 180° of said arcuate exterior circumferential perimeter of said optical element.