Mitsubishi Denki Kabushiki Kaisha

Dai Nippon Printing Co., Ltd.

Shinsuke Sikama

Hiroshi Suzuki

Kuniko Kojima

Hiroshi Sekiguchi

Kohei Teramoto

Yoshihiro Ashizaki

Tadahiko Ryuugou

Hiroshi Dai Nippon Printing Co Ltd Sekiguchi

A Fresnel lens has a plurality of pitch areas in which a plurality of hybrid type prism portions are arranged. Each hybrid type prism portion has a refraction type prism portion and a total reflection type prism portion. In the refraction type prism portion, a ray of incident light Liof an incident angle 'a' is refracted twice and goes out as a ray of outgoing light Loof an outgoing angle 'f'. In the total reflection type prism portion, a ray of incident light Liof the incident angle &#x201c;a&#x201d; is refracted, totally reflected and refracted in that order and goes out as a ray of outgoing light Loparallel to the ray of outgoing light Lo

Fresnel lens, screen, image displaying device, lens forming mold manufacturing method and lens manufacturing method

A Fresnel lens has a plurality of pitch areas in which a plurality of hybrid type prism portions are arranged. Each hybrid type prism portion has a refraction type prism portion and a total reflection type prism portion. In the refraction type prism portion, a ray of incident light Li of an incident angle &ldquo;an&rdquo; is refracted twice and goes out as a ray of outgoing light Lo of an outgoing angle &ldquo;f&rdquo;. In the total reflection type prism portion, a ray of incident light Li of the incident angle &ldquo;a&rdquo; is refracted, totally reflected and refracted in that order and goes out as a ray of outgoing light Lo parallel to the ray of outgoing light Lo

Fresnel lens, screen, image display device, lens mold manufacturing method and lens manufacturing method

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Tokyo, Japan

Shinsuke Sikama