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2. 发明授权

US4969783A Method of working fresnel step 失效
标题翻译：工作菲涅耳步骤的方法
公开(公告)号：US4969783A
公开(公告)日：1990-11-13
申请号：US334621
申请日：1989-04-07
申请人： Yasuo Ozawa , Koichi Sakakibara , Noboru Kojima , Akira Nagakura , Seiji Igarashi
发明人： Yasuo Ozawa , Koichi Sakakibara , Noboru Kojima , Akira Nagakura , Seiji Igarashi
IPC分类号： B24B13/00 , F21V5/00
CPC分类号： F21S48/2212 , B24B13/00 , Y10T409/303808
摘要： In connection with a Fresnel lens in which concentric pitch base lines are drawn on a curved lens member at certain pitches and a number of radial partitioning lines are drawn so as to pass through the center of the concentric pitch base lines and to cross these lines so that a surface of the lens member is partitioned into a large number of arcuate Fresnel step design sections, and an angled Fresnel step is formed in each of the Fresnel step design sections so that light transmitted from a focal point of the lens at its rear side forms a substantially parallel flux of light through a refractive or reflective prism, the invention relates to the cutting of Fresnel steps in a mold element for forming the lens by causing a tool attached to a multiple axis milling cutter and having an acute point to perform reciprocating or circumferential cutting for every width of each of the inclined surfaces of said Fresnel steps while causing the tool to move radially to perform scan-cutting of the inclined surfaces. The cutting inclination angle at the point of the tool attached on said multiple spindle milling cutter may be made equal to the angle of the Fresnel step at its steep surface side. Alternatively, the tool axis may be varied during cutting to allow the tool angle to correspond to the given angle or angles of the inclined surfaces.
摘要翻译：与菲涅尔透镜相关联，其中同心螺距基线以一定的间距被绘制在弯曲透镜构件上，并且多个径向分隔线被拉伸以便穿过同心螺距基线的中心并且跨越这些线透镜构件的表面被划分成大量的弧形菲涅耳步骤设计部分，并且在每个菲涅尔级设计部分中形成有棱角的菲涅尔级，使得从其后侧的透镜的焦点透射的光通过折射或反射棱镜形成基本上平行的光通量，本发明涉及通过使附接到多轴铣刀上的工具并且具有锐角来执行往复运动来在用于形成透镜的模具元件中切割菲涅耳步骤或者对于所述菲涅尔台阶的每个倾斜表面的每个宽度进行周向切割，同时使得工具径向移动以执行扫描粘结的表面。安装在多主轴铣刀上的刀具点上的切削倾斜角度可以等于菲涅尔阶梯在其陡峭表面侧的角度。或者，刀具轴线可以在切割期间变化，以允许刀具角度对应于倾斜表面的给定角度或角度。

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