Title:
FRESNEL LENS AND ILLUMINATION APPARATUS
Document Type and Number:
Japanese Patent JP2017037325
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a Fresnel lens having no sudden luminous intensity change in a central portion and ensuring no generation of a ring pattern around the central portion.SOLUTION: A Fresnel lens 1 is configured such that convex portions 12 and concave portions 13 are repeatedly and alternately disposed on any one of surfaces of a lens body 10 transmitting light, and a light source is disposed in a direction perpendicular to the lens surface at a position apart from a center of the lens surface by a predetermined distance. The Fresnel lens 1 is configured such that the surface on which the convex portions 12 and the concave portions 13 are formed is disposed on a light source side, a circular arc part R is formed in one of or each of a peak part of each convex portion 12 or a deepest part of each concave portion 13, and the Fresnel lens comprises a dispersion part 11 dispersing incident light.SELECTED DRAWING: Figure 3
Inventors:
MOCHIZUKI KEIICHI
OSUMI KAZUMASA
OSUMI KAZUMASA
Application Number:
JP2016196340A
Publication Date:
February 16, 2017
Filing Date:
October 04, 2016
Export Citation:
Assignee:
NITTO OPTICAL
KOIKE YASUHIRO
KOIKE YASUHIRO
International Classes:
G02B3/08; F21S8/02; F21V5/04; G02B19/00
Domestic Patent References:
| JP2004012808A | 2004-01-15 | |||
| JPS63101902U | 1988-07-02 | |||
| JPH0357102A | 1991-03-12 |
Foreign References:
| WO1997001115A1 | 1997-01-09 |
Attorney, Agent or Firm:
Iat International Patent Business Corporation