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1. (WO2018158347) IMPROVEMENTS IN OR RELATING TO VIRTUAL AND AUGMENTED REALITY HEADSETS

Pub. No.:    WO/2018/158347    International Application No.:    PCT/EP2018/054983
Publication Date: Sat Sep 08 01:59:59 CEST 2018 International Filing Date: Thu Mar 01 00:59:59 CET 2018
IPC: G02B 27/01
Applicants: ADLENS LTD
Inventors: RHODES, Daniel, Paul
STEVENS, Robert Edward
Title: IMPROVEMENTS IN OR RELATING TO VIRTUAL AND AUGMENTED REALITY HEADSETS
Abstract:
A virtual or augmented reality headset (10) comprising two lens groups (100) for imaging two side-by-side 2-dimensional images displayed on a display (1) within the headset to form a virtual stereographic 3-dimensional image; each lens group comprising a primary lens (70), a first adjustable lens (200) for correcting a spherical refractory error in a user's distance vision and a second adjustable lens (300) for correcting astigmatism, the primary lens and first and second adjustable lenses within each lens group being in mutual optical alignment on a respective optical axis (z). Suitably, the first adjustable lens comprises a cubic surface-type adjustable lens (e.g. an Alvarez lens) comprising two superposed lens elements having mutually cooperating cubic or higher order surfaces that are slidable relative to one other along an x-axis of the first adjustable lens, while the second adjustable lens is rotatable about the z-axis and comprises a cubic surface-type in which two similarly superposed lens elements are slidable relative to one other along an y-axis of the second adjustable lens.