Patent ID: 11966042
Assignee: ADLENS LTD
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. The augmented reality display unit as claimed in claim 18, wherein each of the front and rear compression liquid lens assemblies comprises a fluid-filled envelope having a first wall formed by a distensible elastic membrane that is held under tension around its edge by a membrane holding structure, a second substantially rigid wall formed by or supported on an inner surface of a transparent plate or a hard lens of fixed focusing power, and a collapsible side wall; wherein the membrane forms an optical surface of variable optical power, and the adjustment mechanism is arranged to displace the membrane holding structure towards or away from the second wall parallel to the optical axis for increasing or decreasing the pressure of the fluid within the envelope thereby to cause the membrane to distend or contract respectively parallel to the optical axis for changing the focusing power of the optical surface of the membrane.