Title:
LENS SYSTEM AND IMAGE OBSERVATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/045518
Kind Code:
A1
Abstract:
The present invention proposes a lens system capable of reducing the occurrence of circular lines and providing a high-definition image to a user. This lens system has at least one Fresnel lens. A lens surface of the Fresnel lens has a plurality of concentrically formed grooves. Both a pitch that is the distance between two adjacent grooves and the depth of each of the plurality of grooves change according to the distance from an optical axis passing through the center of the lens system.
Inventors:
ISHIOKA MANABU (JP)
KATSUDA YASUTOSHI (JP)
TADA SHOTARO (JP)
KATSUDA YASUTOSHI (JP)
TADA SHOTARO (JP)
Application Number:
PCT/JP2019/033760
Publication Date:
March 05, 2020
Filing Date:
August 28, 2019
Export Citation:
Assignee:
SONY INTERACTIVE ENTERTAINMENT INC (JP)
International Classes:
G02B25/00; G02B13/18; G02B27/02
Domestic Patent References:
| WO2017138480A1 | 2017-08-17 |
Foreign References:
| JP2015203850A | 2015-11-16 | |||
| JP2006330432A | 2006-12-07 | |||
| JP2007011216A | 2007-01-18 | |||
| KR20050023970A | 2005-03-10 |
Other References:
F. L. VAN NESJ. J. KOENDERINKH. NASM. A. BOUMAN: "Spatiotemporal Modulation Transfer in the Human Eye", JOURNAL OF THE OPTICAL SOCIETY OF AMERICA, vol. 57, no. 9, 1967, pages 1082 - 1088
See also references of EP 3845949A4
See also references of EP 3845949A4
Attorney, Agent or Firm:
HARUKA PATENT & TRADEMARK ATTORNEYS (JP)
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