Invention Grant
- Patent Title: Progressive addition lens
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Application No.: US15311571Application Date: 2015-06-03
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Publication No.: US10288903B2Publication Date: 2019-05-14
- Inventor: Tadashi Kaga , Toshihide Shinohara , Ayumu Ito , Hiroshi Asami
- Applicant: Tadashi Kaga , Toshihide Shinohara , Ayumu Ito , Hiroshi Asami
- Applicant Address: TH Patumthani
- Assignee: HOYA LENS THAILAND LTD.
- Current Assignee: HOYA LENS THAILAND LTD.
- Current Assignee Address: TH Patumthani
- Agency: Oliff PLC
- Priority: JP2014-116285 20140604
- International Application: PCT/JP2015/066110 WO 20150603
- International Announcement: WO2015/186767 WO 20151210
- Main IPC: G02C7/06
- IPC: G02C7/06

Abstract:
A progressive addition lens includes a portion having a power for viewing a near field, a portion having a power for viewing a distance field further than the near field, and an portion connecting the distance portion and the near portion. The progressive addition lens includes an aspherical object-side surface and an aspherical eyeball-side surface and is formed in rotational symmetry with respect to a center of design of the progressive addition lens. The object-side surface includes a first stable region formed in rotational symmetry with respect to the center of design and including the center of design, and an aspherical region arranged outside of the first stable region to contact the first stable region and formed in rotational symmetry with respect to the center of design. A PV value (Peak to Valley) of a mean surface refractive power in the first stable region is 0.12 D or less.
Public/Granted literature
- US20170082870A1 PROGRESSIVE ADDITION LENS Public/Granted day:2017-03-23
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