Optical: systems and elements – Lens – With multipart element
Reexamination Certificate
2005-09-20
2005-09-20
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With multipart element
C359S743000, C359S460000
Reexamination Certificate
active
06947225
ABSTRACT:
The present invention provides a Fresnel lens sheet that can, in production using a mold, be easily released from the mold and that scarcely produces stray light upon use, and others. Each prism2on the incident side of a Fresnel lens sheet1is formed to have a nearly triangular cross section and has a plane of refraction3that refracts projected light S incident on this plane and a plane of total reflection4that totally reflects, toward the viewer's side, at least part of the light refracted at the plane of refraction3. Each prism2is made so that a root5between a prism2and a prism3situated next to the prism2, on the plane of total reflection side of the prism2(a root5defined by the plane of refraction3of one prism2B and the plane of total reflection4of another prism2A situated next to the prism2B, on the side of the plane of refraction3of the prism2B) is curved toward the prism2A side from the prism2B side.
REFERENCES:
patent: 4919518 (1990-04-01), Ogino et al.
patent: 5398137 (1995-03-01), Ishikawa et al.
patent: 6252724 (2001-06-01), Scheer
patent: 61-208041 (1986-09-01), None
Sekiguchi Hiroshi
Yoshida Yoshiki
Dai Nippon Printing Co. Ltd.
Epps Georgia
Hasan M.
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