A valve device for a variable lens comprises: an inlet for receiving fluid from a reservoir; an outlet for passing fluid to a lens cavity; and a valve member, the valve member comprising a passageway for fluid communication between the inlet and outlet and a valve for closing the passageway; wherein the valve is act...

A deformable membrane assembly 1 comprising a fixed support; a fluid filled envelope one wall of which is formed by an elastic membrane 8 that is held under tension around its edge by a flexible membrane supporting member 2 10 the membrane supporting member being coupled to the fixed support at a plurality of discre...

The present invention provides a deformable membrane assembly 1 comprising an elastic membrane 8 that is held under tension around its edge by a bendable membrane supporting member 2, 10 a body of fluid in contact with one face of the membrane the pressure of the fluid being controllable for adjusting the shape of t...

A deformable membrane assembly comprises an at least partially flexible fluid filled envelope one wall of which is formed by an elastic membrane that is held around its edge by a resiliently bendable supporting ring a fixed support for the envelope and selectively operable means for causing relative movement between...

The invention provides a variable focus lens. The lens is formed from a ring (120) with a front surface (122) and a rear surface. A flexible membrane (140) is attached to a radially inner part (124) of the front surface and a front cover (150) is attached to a radially outer part (126) of the front surface. A rear c...