Title:
フレネルレンズ及び照明装置
Document Type and Number:
Japanese Patent JP6572274
Kind Code:
B2
Abstract:
To provide a Fresnel lens which solves the problem of wavelength dispersion while realizing compactification and also which has no problem of product performance and appearance.SOLUTION: A plurality of prism parts 10 arranged on a surface include first prism parts 10A emitting a refract light beam to a radiation range outermost part R1 and second prism parts 10B located on the side opposite to the first prism parts 10A having an optical axis A therebetween and the second prism parts 10B irradiate a radiation range outermost part R1 on the opposite side having the optical axis A therebetween. A refractive surface of the second prism parts 10B is given such that distribution in a direction perpendicular to the optical axis A, of wavelength of light made incident to a radiation range outermost part R is reversed to distribution in a direction perpendicular to the optical axis A, of wavelength of light made incident to the radiation range outermost part R1 from the second prism parts 10B.SELECTED DRAWING: Figure 1
More Like This:
Inventors:
Koichi Sato
Application Number:
JP2017179382A
Publication Date:
September 04, 2019
Filing Date:
September 19, 2017
Export Citation:
Assignee:
Nippon Special Optical Resin Co., Ltd.
International Classes:
G02B3/08; F21V5/04
Domestic Patent References:
| JP2005099802A | ||||
| JP2012009846A | ||||
| JP2000258845A | ||||
| JP2012042926A |
Foreign References:
| WO2016037789A1 | ||||
| US20090250095 |
Attorney, Agent or Firm:
Koichi Hotate