Invention Grant
- Patent Title: Ocular optical system including a lens group having cemented lens and head-mounted display using the same
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Application No.: US16181866Application Date: 2018-11-06
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Publication No.: US10921583B2Publication Date: 2021-02-16
- Inventor: Miho Matsumoto , Atsushi Sekine , Hidetsugu Takagi
- Applicant: NIKON CORPORATION
- Applicant Address: JP Tokyo
- Assignee: NIKON CORPORATION
- Current Assignee: NIKON CORPORATION
- Current Assignee Address: JP Tokyo
- Priority: JPJP2016-135409 20160707
- Main IPC: G02B5/18
- IPC: G02B5/18 ; G02B27/00 ; G02B3/08 ; G02B27/01 ; G02B27/42 ; G02B25/00 ; G02B30/36
Abstract:
An ocular optical system (EL) comprises, in order from an eye point (EP), a first lens group (G1) having a positive refractive power and a second lens group (G2) having a positive refractive power. The second lens group (G2) includes a cemented lens having two optical members cemented together. A cemented surface of the cemented lens is a diffraction optical surface configuring a diffraction grating. A lens surface on one side in a lens constituting the first lens group (G1) is a first Fresnel surface (FSa), and a lens surface on one side in the cemented lens of the second lens group (G2) is a second Fresnel surface (FSb).
Public/Granted literature
- US20190072763A1 OCULAR OPTICAL SYSTEM AND HEAD-MOUNTED DISPLAY Public/Granted day:2019-03-07
Information query
