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Patent Searching and Data


Title:
OCULAR OPTICAL SYSTEM AND HEAD MOUNTED DISPLAY
Document Type and Number:
WIPO Patent Application WO/2020/021916
Kind Code:
A1
Abstract:
An ocular optical system (EL) has a Fresnel lens (L1) having a plurality of Fresnel zones (FR) formed on a lens surface on the observation object side. The plurality of Fresnel zones (FR) is concentrically arranged side by side along an aspherical surface that is rotationally symmetric about the central axis of the Fresnel lens (L1), the plurality of Fresnel zones satisfying the following conditional expression: 0 < PAE1 / PAC1 ≤ 0.50 where, PAE1 represents an average radial pitch of the Fresnel zones (FR) formed in a region 15 mm or more away in the radial direction from the central axis of the Fresnel lens (L1), and PAC1 represents an average radial pitch of the Fresnel zones (FR) formed in a region that is within the distance of 15 mm in the radial direction from the central axis of the Fresnel lens (L1), excluding a first Fresnel zone (FR)(1).

Inventors:
TAKAGI HIDETSUGU (JP)
MATSUMOTO MIHO (JP)
Application Number:
JP2019/024219
Publication Date:
January 30, 2020
Filing Date:
June 19, 2019
Export Citation:
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Assignee:
NIKON CORP (JP)
International Classes:
G02B25/00; G02B3/08; G02B5/00; G02B27/02
Domestic Patent References:
WO2018117025A12018-06-28
WO2018008249A12018-01-11
Foreign References:
US20180074318A12018-03-15
JPH0463401U1992-05-29
JP2016176981A2016-10-06
JP2018106167A2018-07-05
JP2017211475A2017-11-30
Attorney, Agent or Firm:
OHNISHI, Shogo et al. (S.OHNISHI & ASSOCIATES, HIGASHI-IKEBUKURO SS BUILDING 1F 3-20-3, Higashi-Ikebukuro, Toshima-k, Tokyo 13, 〒1700013, JP)
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