Norikazu Yokoi — Lens Patent Author | Surface & Stop

Norikazu Yokoi4 related patents across 5 interactive lens diagrams.
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Nikon Corporation (2)
Sigma Corporation (2)
Nikon Corporation(2)JP WO2020/105107 A1↗2020Assignee: Nikon Corporation
Inventors: Takahiro Ishikawa, Norikazu Yokoi
Example 1NIKON NIKKOR Z DX 50-250mm f/4.5-6.3 VR— Production: 50-250 mm, f/4.5-6.3, Patent Example 1: f = 51.50-242.80 mm
WO 2022/264542 A1↗2022Assignee: Nikon Corporation
Inventors: Tomoyuki Sashima, Norikazu Yokoi, Takahiro Ishikawa
Example 1NIKON NIKKOR Z DX 18-140mm f/3.5-6.3 VR— 17 ELEMENTS / 13 GROUPS, f = 18.5–135.8 mm (design)
Sigma Corporation(2)JP 2001-330771 A↗2001Assignee: Sigma Corporation
Inventors: Shizuka Takemoto, Norikazu Yokoi
Numerical Example 1SIGMA 28mm f/1.8 EX DG ASPHERICAL MACRO— 10 ELEMENTS / 9 GROUPS, DESIGN f = 27.10 mmNumerical Example 2SIGMA 24mm f/1.8 EX DG ASPHERICAL MACRO— 10 ELEMENTS / 9 GROUPS, DESIGN f = 24.69 mm
JP 2002-236254 A↗2002Assignee: Sigma Corporation
Inventors: Norikazu Yokoi, Tetsusuke Kusakawa, Shizuka Takemoto
Numerical Example 2SIGMA 24-70mm f/3.5-5.6 ASPHERICAL HF— 9 ELEMENTS / 7 GROUPS, DESIGN f = 25.0-67.6 mm