Industry Patents
Patent: 7618161
Fresnel Lens and Lighting Apparatus Provided With the Fresnel Lens
(Click image for PDF of full patent)
| Patent Number: |
7618161 |
| Title: |
Fresnel Lens and Lighting Apparatus Provided With the Fresnel Lens |
| 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 .phi., 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 .theta., a relational equation
.theta..gtoreq..phi./(2 n N) stands.
|
| Country of Issue: |
US |
| First Named Inventor: |
Morino, Honguh, Shiratsuchi, Tokuhara |
| Assignee: |
Kabushiki Kaisha Toshiba |
| Continuation or Divisional of: |
7298558 |
| International Classification: |
F21V 5/04 |
| US Classification: |
362/335 |
| Issue Date: |
11-17-2009 |
| Filing Date: |
09-14-2005 |
| Application : |
11/224953 |
| Notes: |
|
| Link to Patent at freepatentsonline.com: |
7618161 at Freepatentsonline |
| Link to World Patent Family1: |
World Patent Family at European Patent Office |
| Link to Google Patents1: |
7618161 at Google Patents |
1. The Google Patents and World Patent Family links will likely not work until a few weeks
after the patent has issued - they take a while to get new patents in their systems.
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