Invention Grant
- Patent Title: Diffraction-type multifocal ophthalmic lens and manufacturing method thereof
- Patent Title (中): 衍射型多焦点眼镜片及其制造方法
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Application No.: US14377029Application Date: 2012-02-09
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Publication No.: US09563070B2Publication Date: 2017-02-07
- Inventor: Ichiro Ando , Hiroaki Suzuki , Atsushi Kobayashi
- Applicant: Ichiro Ando , Hiroaki Suzuki , Atsushi Kobayashi
- Applicant Address: JP Nagoya-shi
- Assignee: MENICON CO., LTD.
- Current Assignee: MENICON CO., LTD.
- Current Assignee Address: JP Nagoya-shi
- Agency: Oliff PLC
- International Application: PCT/JP2012/000858 WO 20120209
- International Announcement: WO2013/118176 WO 20130815
- Main IPC: G02C7/04
- IPC: G02C7/04 ; G02C7/06 ; A61F2/16 ; G02B3/08 ; G02B27/42

Abstract:
Provided is a diffraction-type multifocal ophthalmic lens for which halos are reduced. Also provided is a diffraction-type multifocal ophthalmic lens having three or more focal points, which is implemented on the basis of the discovery that the diffraction-type multifocal ophthalmic lens has a characteristic whereby multiple focal points can be generated in the intermediate region as well as the near and far regions. Also provided is a method for manufacturing a diffraction-type multifocal ophthalmic lens which provides a simple design and manufacturing method by means of a simple diffraction structure and by replacing a cumbersome computer simulation with a simple method. This diffraction-type multifocal ophthalmic lens has a diffraction structure (20) where a plurality of diffraction zones are formed concentrically on the lens (10), and an equal-pitch region is provided where pitches of at least two zones among the diffraction zones are made equal.
Public/Granted literature
- US20140347624A1 DIFFRACTION-TYPE MULTIFOCAL OPHTHALMIC LENS AND MANUFACTURING METHOD THEREOF Public/Granted day:2014-11-27
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