Title:
OCULAR OPTICAL SYSTEM AND HEAD-MOUNTED DISPLAY
Document Type and Number:
WIPO Patent Application WO/2019/163415
Kind Code:
A1
Abstract:
An ocular optical system (EL) comprises: a first Fresnel lens (first lens (L1)) having a first Fresnel surface (FSa) formed on the lens surface on the image display unit (11) side; and a second Fresnel lens (second lens (L2)) placed closer to the image display unit (11) than the first Fresnel lens and having a second Fresnel surface (FSb) formed on the lens surface on the image display unit (11) side. In a plurality of wall surfaces constituting the first Fresnel surface (FSa) and the second Fresnel surface (FSb) within the radii of at least 10 mm from the optical axes for the first Fresnel surface (FSa) and the second Fresnel surface (FSb), the tilt angle of a wall surface in the first Fresnel surface (FSa) relative to the optical axis for the wall surface is greater than the tilt angle of a wall surface in the second Fresnel surface (FSb) relative to the optical axis for the wall surface, for the wall surfaces that are in the same order from the optical axes for the first and the second Fresnel surfaces.
Inventors:
TAKAGI HIDETSUGU (JP)
Application Number:
PCT/JP2019/002619
Publication Date:
August 29, 2019
Filing Date:
January 28, 2019
Export Citation:
Assignee:
NIKON CORP (JP)
International Classes:
G02B25/00; G02B3/08; G02B27/02
Domestic Patent References:
| WO2018008249A1 | 2018-01-11 |
Foreign References:
| JP2017211475A | 2017-11-30 | |||
| JP2017211474A | 2017-11-30 | |||
| JP2015049305A | 2015-03-16 |
Other References:
See also references of EP 3757652A4
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (JP)
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