Takahiko Ohishi — Lens Patent Author | Surface & Stop

Takahiko Ohishi2 related patents across 2 interactive lens diagrams.
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Ricoh Imaging Company, Ltd. (1)
No named assignee or applicant (1)
Ricoh Imaging Company, Ltd.(1)JP 2015-11156 A↗2015Assignee: Ricoh Imaging Company, Ltd.
Inventors: Takahiko Ohishi
HD PENTAX-DA 20-40mm f/2.8-4 ED Limited DC WR— 9 ELEMENTS / 8 GROUPS, 20–40mm f/2.8–4 (production)
No named assignee or applicant(1)US 2018/0164556 A1↗2018Inventors: Takahiko Ohishi
PENTAX HD DA* 11-18mm f/2.8 ED DC AW— 16 ELEMENTS / 11 GROUPS, 11–18 mm MARKETING / 11.25–17.70 mm DESIGN