| 摘要 |
PROBLEM TO BE SOLVED: To prevent the abrasion of a cutting tool such as a diamond cutting tool by feeding an oil mist to the machined face of a noble metal via inert gas serving as a pressure medium. SOLUTION: A groove 3 of the prescribed diffraction optical pattern is cut on the face of a noble metal thin film 2 formed by sputtering at the center recess of the molding die 1 of a glass reheat press formed into a hologram lens shape by a diamond cutting tool 4 while an oil mist 6 is fed from a nozzle 5. Nitrogen is preferably used for the inert gas as the pressure medium of the oil mist 6, and argon, helium, neon or klypton, for example, can be used as far as it is the inert gas. When the inert gas is used, the oxidation, carbonization and abrasion of the diamond cutting tool 4 can be prevented. At least one kind selected from a group of third-class petroleums having the viscosity nearly equal to that of kelosene oil, for example, is used for the material of the oil mist.
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