Sumitomo Electric Industries, Limited

Kabushiki Kaisha Topcon

Sumitomo Electric Hardmetal Corp.

Osaka Prefecture University Public Corporation

Hisao Kikuta

Yasufumi Fukuma

Kenichi Kurisu

Hidetaka Aeba

Kazuhiko Ohnuma

Keiji Ebata

Takashi Shioiri

At least one surface of a plate member made of ZnSe has a concave-and-convex structure in which a projecting section and a groove section are formed at a spatial cycle equal to or lower than the wavelength of carbon dioxide laser light to thereby provide a substrate body. On a surface of the concave-and-convex structure, an antireflection film is layered that has a lower refractive index than that of ZnSe to carbon dioxide laser light. By this configuration, the polarization state of transmitted carbon dioxide laser light is converted from a linear polarization to a circular polarization or the like.

Carbon dioxide laser light optical component

A fundus examination apparatus includes an illumination optical system (), which illuminates a fundus by fundus illumination light, an imaging optical system (), which photographs a fundus image based on a polarization property of reflected illumination light, and a picture signal processing device, which processes a signal output from the imaging optical system; and the imaging optical system includes a phase plate array () that a plurality of unit constitutional plates (U) is arranged in a matrix in a plane; each of the unit constitutional plates comprising four or more micro phase plates (-), a polarizer (), which polarizes the reflected illumination light passing through the phase plate array () into a predetermined polarization direction, and an image pickup device () that a plurality of constitutional units (U) is arranged in a matrix in a plane; each of the constitutional units comprising four or more pixels (G-G).

Fundus examination apparatus

Growing community of inventors

Sakai, Japan

Hisao Kikuta