• 光学設計の基礎2013/11/01

    (日本語) 光学設計の基礎知識

    (日本語) 光学設計の基礎知識をまとめました。ご活用ください。
  • Fresnel_Lens_at_Point_Arena_Lighthouse_Museum2013/04/08

    Fresnel lens

    A Fresnel lens (pronounced /freɪˈnɛl/ fray-nel or /ˈfrɛznəl/ frez-nel) is a type of compact lensoriginally developed by French physicist Augustin-Jean Fresnel for lighthouses.[1] The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the…
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