Ultra Precision Grinding of Micro Aspherical Surface – Development of a Three-Axes Controlled Single Point Inclined Grinding Method –

Needs of digital devices increase rapidly in recent years, and the demand for a micro axis-symmetric aspherical glass lens of large NA (numerical aperture) is expanding rapidly especially in the device for digital camera, camera-equipped mobile phone, DVD pick-up and the optical transmission [1][2]. Moreover blue lasers have been increasingly used to make wavelengths short and the maximum tangent angle of the lens reaches t