Invention Grant
- Patent Title: Ophthalmic diffractive multi-focal lens and method for manufacturing ophthalmic diffractive multi-focal lens
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Application No.: US16074617Application Date: 2016-02-09
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Publication No.: US11009723B2Publication Date: 2021-05-18
- Inventor: Ichiro Ando
- Applicant: MENICON CO., LTD.
- Applicant Address: JP Nagoya
- Assignee: MENICON CO., LTD.
- Current Assignee: MENICON CO., LTD.
- Current Assignee Address: JP Nagoya
- Agency: Oliff PLC
- International Application: PCT/JP2016/053874 WO 20160209
- International Announcement: WO2017/138099 WO 20170817
- Main IPC: G02C7/04
- IPC: G02C7/04 ; G02B5/18 ; G02C7/02 ; A61F2/16

Abstract:
Provided is an ophthalmic diffractive multi-focal lens with a diffractive structure including a phase profile in which a plurality of blaze shaped zones are set in a concentric circle form, wherein: at least one of the zones serves as an adjustment zone wherein an inclination direction in the phase profile is reversed with respect to that of other zones; and a light intensity level giving a peak or focal point at a position away from three focal points in a light intensity distribution of transmitted light in an optical axis direction is kept low in comparison with a phase profile without the adjustment zone.
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