Invention Grant
- Patent Title: Progressive addition lens and design method therefor
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Application No.: US17280997Application Date: 2019-09-27
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Publication No.: US12140821B2Publication Date: 2024-11-12
- Inventor: Hiroshi Asami , Yasunori Izawa , Tadashi Kaga
- Applicant: HOYA LENS THAILAND LTD.
- Applicant Address: TH Pathumthani
- Assignee: HOYA LENS THAILAND LTD.
- Current Assignee: HOYA LENS THAILAND LTD.
- Current Assignee Address: TH Pathumthani
- Agency: Oliff PLC
- Priority: JP2018-185993 20180928,JP2018-186038 20180928,JP2019-048645 20190315,JP2019-048646 20190315,JP2019-048647 20190315,JP2019-093366 20190517
- International Application: PCT/JP2019/038390 WO 20190927
- International Announcement: WO2020/067522 WO 20200402
- Main IPC: G02C7/06
- IPC: G02C7/06 ; G02C7/02
Abstract:
A progressive addition lens and the related technology, the progressive addition lens including a near portion for viewing a near distance, a distance portion for viewing a distance farther than the near distance, and an intermediate portion between the near portion and the distance portion and having a progressive refraction function, in which the transmission astigmatism is added to the near portion and the intermediate portion of the distance portion, the near portion, and the intermediate portion, and in the near portion and the intermediate portion to which the transmission astigmatism is added, the progressive addition lens further includes a portion where an amount of horizontal refractive power is greater than an amount of vertical refractive power after subtracting the refractive power for astigmatism correction.
Public/Granted literature
- US20210356765A1 PROGRESSIVE ADDITION LENS AND DESIGN METHOD THEREFOR Public/Granted day:2021-11-18
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