@article{oai:niigata-u.repo.nii.ac.jp:00003839, author = {王, 英夫 and 桝田, 正美 and 西口, 隆 and 秋山, 秀俊}, issue = {611}, journal = {日本機械学会論文集. C編, 日本機械学会論文集. C編}, month = {Jul}, note = {An experimental study of precision cutting of molding dies using single crystal diamond cutting tools for large Fresnel screens (size: T3×921×714 mm, Fresnel angle: 0.004-55.0), for improving the optical characteristics of the screens is described. The conclusions are as follows: (1) A burr is generated at the shoulder of the grooves during cutting, which causes compressed chip material to accumulate and laterally compress both sidewalls of the grooves; (2) The burr generation is suppressed by increase of the rake angle of the diamond cutters, decrease of the down feed rate, and reduction of stock removal; (3) Generation of a color corn on the Fresnel screen is caused by light escaping through non-lens surfaces; this is avoided by making the non-lens surfaces semi-transparent where the surface roughness is around 1μm R_ Through use of the above-mentioned information to improve the cutting process, desirable optical characteristics were achieved for Fresnel screens used in projection TVs.}, pages = {2544--2551}, title = {成形金型切削プロセス最適化によるフレネルスクリーンの光学特性向上}, volume = {63}, year = {1997} }