Yutaka Iizuka — Lens Patent Author | Surface & Stop

Yutaka Iizuka4 related patents across 4 interactive lens diagrams.
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Nippon Kogaku K.K. (4)
Nippon Kogaku K.K.(4)US 4,189,213 A↗1980Assignee: Nippon Kogaku K.K.
Inventors: Yutaka Iizuka
Example 3NIKON AI ZOOM-NIKKOR 50-300mm f/4.5 ED— 15 ELEMENTS / 5 PATENT GROUPS, 50-300mm
US 4,398,807 A↗1983Assignee: Nippon Kogaku K.K.
Inventors: Yutaka Iizuka
Sole exampleNIKON SERIES E ZOOM 75-150mm f/3.5— 12 ELEMENTS / 9 GROUPS, DESIGN f = 75.02-150.09 mm
US 4,437,734 A↗1984Assignee: Nippon Kogaku K.K.
Inventors: Yutaka Iizuka
Example 1NIKON MEDICAL-NIKKOR 120mm f/4 IF— 9 ELEMENTS / 6 GROUPS, 120mm f/4 (MARKETING)
US 4,666,259 A↗1987Assignee: Nippon Kogaku K.K.
Inventors: Yutaka Iizuka
Embodiment 1NIKON REFLEX-NIKKOR 500mm f/8 (New)— 6 elements / 6 groups, f = 499.482 mm