Patent ID: 11867928
Assignee: ADLENS LTD
Field: Optics (Instruments)
Classification: CPC G  B | IPC B  G

Claim 19:
20. A filling device for use in filling an envelope of a compression-type adjustable optical device with a substantially incompressible fluid to a particular focal length under vacuum, wherein the envelope is formed in part by a distensible membrane having an exterior optical surface; the filling device comprising a hollow body portion which defines an interior passageway and has an inlet portion defining a fluid inlet to the passageway; a hollow tube forming a fluid supply conduit which is adapted for connection to a pumped supply of fluid, extends through the interior passageway in the body portion and comprises a distal end portion protruding from the fluid inlet of the body portion has and having a bung-carrying portion at a distal end thereof and a fluid delivery orifice proximate the distal end; and a detachable bung member having a distal head portion which is shaped and dimensioned to form a tight fit within the inlet portion of the body portion to seal the fluid inlet and a proximal tail portion that is configured to engage releasably with the bung-carrying portion at the distal end of the hollow tube; wherein the inlet portion is configured to be inserted into an envelope of an optical device to be filled or attached to a port on an optical device which communicates with an interior of an envelope to be filled and the hollow tube is longitudinally slidable in the passageway of the body portion wherein when the detachable bung member carried on the distal end of the hollow tube by inter-engagement of the proximal tail portion with the bung-carrying portion of the hollow tube, fluid can be admitted into the envelope though the hollow tube via the fluid delivery orifice and, after filling, the hollow tube can be retracted proximally in the body portion, thereby causing the distal head portion of the bung member to enter into and seal the inlet portion of the body portion and releasing the proximal tail portion from the bung-carrying portion of the hollow tube, thereby allowing the hollow tube to be removed from the inlet portion which is sealed with the bung member.