发明授权
- 专利标题： Progressive multifocal lens
- 专利标题（中）： 渐进多焦点镜片
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申请号： US954662申请日： 1997-10-20
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公开(公告)号： US5892565A公开(公告)日： 1999-04-06
- 发明人: Yasunori Ueno , Mitsuhiro Yanari , Fumio Takahashi
- 申请人： Yasunori Ueno , Mitsuhiro Yanari , Fumio Takahashi
- 申请人地址： JPX Tokyo
- 专利权人： Nikon Corporation
- 当前专利权人： Nikon Corporation
- 当前专利权人地址： JPX Tokyo
- 优先权： JPX8-297654 19961018; JPX8-297655 19961018; JPX8-297658 19961018
- 主分类号： G02C7/02
- IPC分类号： G02C7/02 ; G02C7/06
摘要：
A progressive multifocal lens is provided with a near part N, a defined vision part F, and an intermediate part P along the main meridian curve MM'. The near center B of the lens is separated from near eyepoint E by a distance of substantially 2 mm to 8 mm in the lower part along the main meridian curve. The refractive power K.sub.E at the near eyepoint, refractive power K.sub.A at the defined center A, and refractive power K.sub.B at the near center B satisfy the condition:0.6
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