Light receiver and Fresnel lens used therein

Details Light receiver and Fresnel lens used therein Light receiver and Fresnel lens used therein

2008-06-23

2010-10-12

Collins, Darryl J (Department: 2873)

Optical: systems and elements

Lens

With multipart element

Reexamination Certificate

active

07813055

ABSTRACT:
A light receiver comprises a Fresnel lens for collecting light signals, and a light receiving element disposed closer to the Fresnel lens than the focal point of the Fresnel lens for receiving the light signals collected by the Fresnel lens. The Fresnel lens comprises a lens surface group having a plurality of lens surfaces, and a back cut surface group having a plurality of back cut surfaces connecting the lens surfaces. The back cut surfaces are inclined with respect to the center axis of the Fresnel lens. Thus, the light receiver has a high light collection efficiency of light signals incident within a certain acceptance angle.

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patent: 2006-177999 (2006-07-01), None
patent: 2006-043567 (2006-04-01), None
Hideo Yasumoto, Tomoaki Ieda, Hiroyuki Sasai, and Masaru Fuse; “Study of miniaturization of optical system for 1 Gbps optical wireless receiver”; IEICE General Conference 2007.
Hideo Yasumoto, Tomoaki Ieda, Hiroyuki Sasai, and Masaru Fuse; “Study of optical design with Fresnel lenses for optical wireless communication system”; IEICE Electronics Society Conference 2006.

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