发明申请
- 专利标题: OPHTHALMIC LENS
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申请号: US17659401申请日: 2022-04-15
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公开(公告)号: US20220244568A1公开(公告)日: 2022-08-04
- 发明人: Haruo Ishikawa
- 申请人: KOWA COMPANY, LTD.
- 申请人地址: JP Nagoya-shi
- 专利权人: KOWA COMPANY, LTD.
- 当前专利权人: KOWA COMPANY, LTD.
- 当前专利权人地址: JP Nagoya-shi
- 优先权: JP2014-048026 20140311
- 主分类号: G02C7/02
- IPC分类号: G02C7/02 ; A61F2/16 ; G02C7/04
摘要:
An ophthalmic lens has a cross-sectional shape in an arbitrary meridian direction on a lens surface of the ophthalmic lens. The cross-sectional shape is expressed by the following formula (1), Z = c r 2 1 + [ 1 - c 2 r 2 ( k + 1 ) ] 1 / 2 + A ( θ ) r 2 + B ( θ ) r 4 . In the formula, c is a paraxial curvature of the ophthalmic lens, r is a distance from a lens center of the ophthalmic lens, k is a conic constant of a surface which is in rotation symmetry with respect to an optical axis of the lens in the ophthalmic lens. The variables c, r and k are used in common in the meridian direction on the lens surface, and A(θ) and B(θ) are parameters expressed by functions depending on an angle in the meridian direction.