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Title:
MULTIFOCAL DIFFRACTION LENS
Document Type and Number:
WIPO Patent Application WO/2022/075423
Kind Code:
A1
Abstract:
The present invention provides a multifocal diffraction lens capable of efficiently using light. A multifocal diffraction lens 100 has a diffraction grating 1c. Minus-order light L2 generates a focal point f2 for distant vision, zero-order light L1 generates a focal point f1 that is closer than that for distant vision, the number of focal points is two or more, and a focal position fc for distant vision in multicolor performance evaluation is disposed closer than a focal position fs for distant vision in single color performance evaluation.

Inventors:
ABE SHUJI (JP)
HISHINUMA YASUHIRO (JP)
MITSUMOTO KOTARO (JP)
ISHIKAWA HARUO (JP)
SHIMIZU NORIO (JP)
Application Number:
PCT/JP2021/037213
Publication Date:
April 14, 2022
Filing Date:
October 07, 2021
Export Citation:
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Assignee:
KOWA CO (JP)
International Classes:
G02B3/10; G02B5/18; G02C7/06
Domestic Patent References:
WO2019020435A12019-01-31
Foreign References:
JP2018525199A2018-09-06
JP2019537066A2019-12-19
JP2010134282A2010-06-17
Attorney, Agent or Firm:
FUKUDA, Mitsuhiro et al. (JP)
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