Title:
照明光学系
Document Type and Number:
Japanese Patent JP7084009
Kind Code:
B2
Abstract:
An illumination optical system having a light source and a single convex lens with a diffractive structure, wherein the phase function of the diffractive structure is represented byϕ(r)=∑i=1Nβ2ir2iwhere r represents distance from the central axis of the lens, the relationship|β2|·(0.3R)2<|β4|·(0.3R)4is satisfied where R represents effective radius of the lens, the second derivative of the phase function has at least one extreme value and at least one point of inflection where r is greater than 30% of R, and the area of a surface of the light source is equal to or greater than 3% of the area of the entrance pupil when the light source side of the lens is defined as the image side.
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Inventors:
Konishi Sadayuki
Kayuri Kinoshita
Kenta Ishii
Norihisa Sakagami
Daisuke Seki
Kayuri Kinoshita
Kenta Ishii
Norihisa Sakagami
Daisuke Seki
Application Number:
JP2020537307A
Publication Date:
June 14, 2022
Filing Date:
August 13, 2018
Export Citation:
Assignee:
Stanley Electric Co., Ltd.
Nalux Co., Ltd.
Nalux Co., Ltd.
International Classes:
F21V5/04; G02B13/00
Domestic Patent References:
| JP4775674B2 | ||||
| JP2009139897A | ||||
| JP2000221434A | ||||
| JP201726787A |
Attorney, Agent or Firm:
Naoya Fushimi