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

Claim 18:
19. A wall component and filling device for a compression-type adjustable optical device having a fluid-filled envelope which is formed at least in part by a distensible membrane and an opposing inflexible wall which is formed by or supported the wall component; wherein the filling device comprises a hollow tube forming a fluid supply conduit which is adapted for connection to a pumped supply of fluid and comprises a distal end portion having a bung-carrying portion at a distal end thereof and a fluid delivery orifice proximate the distal end, and a detachable bung member; and wherein the wall component comprises a hard member having a first surface which is configured to form or support the inflexible wall of the envelope and being formed with an interior channel which extends through the hard member between one end where it opens onto the first surface of the hard member and another end which is adapted to receive the distal end portion of the hollow tube; and wherein the interior channel comprises a first relatively wide section proximate the one end of the interior channel and a second relatively narrow section proximate the other end of the interior channel; the hollow tube is configured such that its distal end portion extends into the first relatively wide section of the interior channel when the hollow tube is inserted into the other end of the interior channel; the detachable bung member has a distal head portion which is dimensioned to form a tight fit in the second relatively narrow section of the interior channel and a proximal tail portion which is configured to engage releasably with the bung-carrying portion at the distal end of the hollow tube; and the hollow tube is longitudinally slidable in the interior channel and wherein the distal end portion of the hollow tube inserted into the first relatively wide section of the interior channel with the detachable bung member carried on the distal end of the hollow tube by inter-engagement of its proximal tail portion with the bung-carrying portion of the hollow tube, fluid can be introduced into the envelope through the hollow tube via the fluid delivery orifice in the hollow tube and the interior channel, and wherein the hollow tube can be withdrawn from the interior channel after filling, thereby causing the distal head portion of the bung member to enter into and seal the second relatively narrow section of the interior channel and releasing the proximal tail portion from the bung-carrying portion of the hollow tube.