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1. (WO2018089107) FRESNEL LENS ASSEMBLY HAVING VARYING FACET ANGLE

Pub. No.:    WO/2018/089107    International Application No.:    PCT/US2017/052538
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Thu Sep 21 01:59:59 CEST 2017
IPC: G02B 3/08
G02B 27/01
Applicants: GOOGLE INC.
Inventors: BIERHUIZEN, Serge
HU, Xinda
CAROLLO, Jerome
Title: FRESNEL LENS ASSEMBLY HAVING VARYING FACET ANGLE
Abstract:
A head mounted display device (1400) includes a display panel (104) and a lens assembly (124) mounted so that an optical axis of the lens assembly intersects the display panel. The lens assembly includes a lens body (102) having a surface (112) facing the display panel and defining Fresnel prisms (108). A Fresnel prism of the Fresnel prisms has a first facet angle when viewed in a first cross-section and has a second facet angle when viewed in a second cross-section parallel to the first cross-section. The first facet angle is different than the second facet angle.