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1. 发明授权

US4944584A Plastic multifocal point spherical lens 失效
标题翻译：塑料多焦点球面透镜
公开(公告)号：US4944584A
公开(公告)日：1990-07-31
申请号：US315258
申请日：1989-02-23
申请人： Koichi Maeda , Akio Takigawa , Yasuyoshi Tago , Motoaki Yoshida
发明人： Koichi Maeda , Akio Takigawa , Yasuyoshi Tago , Motoaki Yoshida
IPC分类号： B29D11/00 , B32B7/02 , B32B27/08 , G02B3/10 , G02C7/06
CPC分类号： B29D11/00528 , B29D11/00413 , G02B3/10 , G02C7/06
摘要： A plastic multifocal point spherical lens comprising a unitary structure of (A) a first synthetic resin layer having a fixed refractive index, (B) a second synthetic resin layer having a substantially fixed refractive index different from the refractive index of the first synthetic resin layer, and (C) a third synthetic resin layer existing between the first synthetic resin layer and the second synthetic resin layer and having a refractive index gradient varying continuously from the refractive index of the first synthetic resin layer to that of the second synthetic resin layer, part of the second synthetic resin layer and part of the third synthetic resin layer together being recessed into the first synthetic resin layer, and the second synthetic resin layer being thicker at the recessed part than the rest. The lens is prepared by (1) partially polymerizing a first monomer to form a partially polymerized molded mass, (2) applying a second monomer to substantially the entire surface of the partially polymerized molded mass, and (3) after part of the second monomer has diffused into the partially polymerized molded mass, subjecting the entire monomers to polymerization reaction and substantially completing the polymerization.
摘要翻译：一种塑料多焦点球面透镜，包括（A）具有固定折射率的第一合成树脂层的单一结构，（B）具有与第一合成树脂层的折射率不同的折射率基本固定的第二合成树脂层和（C）第三合成树脂层，其存在于第一合成树脂层和第二合成树脂层之间，并且具有从第一合成树脂层的折射率与第二合成树脂层的折射率连续变化的折射率梯度，第二合成树脂层的一部分和第三合成树脂层的一部分一起凹入到第一合成树脂层中，并且第二合成树脂层在凹部处比其余部分更厚。该透镜是通过（1）部分聚合第一单体以形成部分聚合的模制物质制备的，（2）将基本上整个部分聚合的模制物质表面施加第二单体，和（3）部分第二单体已经扩散到部分聚合的模制物质中，使整个单体进行聚合反应并基本上完成聚合。

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