Takashi Shirasuna — Lens Patent Author | Surface & Stop

Takashi Shirasuna4 related patents across 4 interactive lens diagrams.
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Canon Inc. (4)
Canon Inc.(4)US 2004/0223070 A1↗2004Assignee: Canon Inc.
Inventors: Takashi Shirasuna
Numerical Example 4CANON EF 28-105mm f/4-5.6— 10 ELEMENTS / 9 GROUPS, PATENT 28.91-101.32mm
JP 2007-003600 A↗2007Assignee: Canon Inc.
Inventors: Takashi Shirasuna
Numerical Example 1CANON EF 70-300mm f/4-5.6 IS USM— 15 elements / 10 groups, Patent design: 72.4-290.0 mm
US 2009/0296231 A1↗2009Assignee: Canon Inc.
Inventors: Takashi Shirasuna
Numerical Embodiment 2CANON EF 70-200mm f/2.8 L IS II USM— 23 elements / 19 groups, Patent f = 72.14-193.97 mm
US 2015/0098138 A1↗2015Assignee: Canon Inc.
Inventors: Takashi Shirasuna
Example 2CANON EF 35mm f/1.4 L II USM— 14 ELEMENTS / 11 GROUPS, 35.4218 mm DESIGN EFL