Method for manufacturing fresnel lens mold, machining apparatus, and cutting tool
AssigneeNational University Corporation Tokai National Higher Education and Research System
InventorEiji SHAMOTO
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Abstract
Provided is a method for manufacturing a Fresnel lens mold by performing cutting process on a workpiece with a cutting tool, the Fresnel lens mold having a lens surface and an upright surface alternately arranged. The cutting tool has a first cutting edge having an arc shape with a radius r and a second cutting edge continuous to the first cutting edge. A machining apparatus repeatedly performs a first process of forming, with the first cutting edge, a lens mold surface serving as a mold of a lens surface of a Fresnel lens, and a second process of forming, with the second cutting edge, an upright mold surface serving as a mold of an upright surface of the Fresnel lens to manufacture the Fresnel lens mold.
Claims9
A method for manufacturing a Fresnel lens mold by performing cutting process on a workpiece with a cutting tool, the Fresnel lens mold having a lens surface and an upright surface alternately arranged, the cutting tool having a first cutting edge having an arc shape with a radius r1 and a second cutting edge continuous to the first cutting edge and having an arc shape with a radius r2 different from the radius r1, the method comprising:
- a first process of forming a lens mold surface serving as a mold of a lens surface of a Fresnel lens with the first cutting edge;
- and
- a second process of forming an upright mold surface serving as a mold of an upright surface of the Fresnel lens with the second cutting edge, wherein
- the first process and the second process are repeatedly performed to manufacture the Fresnel lens mold.
A machining apparatus that performs cutting process on a workpiece with a cutting tool to manufacture a Fresnel lens mold having a lens surface and an upright surface alternately arranged, the cutting tool having a first cutting edge having an arc shape with a radius r1 and a second cutting edge continuous to the first cutting edge and having an arc shape with a radius r2 different from the radius r1, the machining apparatus comprising:
- a motion mechanism structured to move the cutting tool relative to the workpiece;
- and
- a control device structured to control operation of the motion mechanism to repeatedly perform process of forming a lens mold surface serving as a mold of a lens surface of a Fresnel lens with the first cutting edge and process of forming an upright mold surface serving as a mold of an upright surface of the Fresnel lens with the second cutting edge.
A cutting tool for use in manufacturing a Fresnel lens mold, the cutting tool comprising:
- a first cutting edge having an arc shape with a radius r1, the first cutting edge being structured to finish a lens mold surface serving as a mold of a lens surface of a Fresnel lens;
- and
- a second cutting edge continuous to the first cutting edge at a cutting edge ridgeline, the second cutting edge being structured to finish an upright mold surface serving as a mold of an upright surface of the Fresnel lens.
Dependencies are inferred from the claim text.