Illumination – Light modifier – Refractor
Reexamination Certificate
2005-09-14
2009-11-17
Payne, Sharon E (Department: 2875)
Illumination
Light modifier
Refractor
C362S244000, C362S328000, C362S332000, C362S337000, C362S340000, C359S742000, C359S743000
Reexamination Certificate
active
07618161
ABSTRACT:
In a Fresnel lens which is made of a lens material whose refraction index is n, and focuses light beam from a light source at a specified radiation view angle φ, and has plural N pieces of circular lens surfaces arranged concentrically around a common optical axis, and plural circular rise surfaces arranged adjacent alternately between these lens surfaces, and two lens surfaces adjacent via at least one of the rise surfaces are concave surfaces, and tangent lines and at the intersecting point with the rise surfaces of the shape of a cross section passing through the optical axis of those lens surfaces intersect at the outside with respect to the optical axis, and when the angle formed between these tangent lines is defined as θ, a relational equation θ≧φ/(2 n N) stands.
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Honguh Yoshinori
Morino Takeshi
Shiratsuchi Masataka
Tokuhara Naoto
Kabushiki Kaisha Toshiba
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Payne Sharon E
Zettl Mary
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