To provide a manufacturing method for simultaneously forming machined patterns different in dept in a small number of steps and a machined pattern having a U-shaped sectional form in which depths and widths are smoothly changed. Mask patterns 62 respectively having a semicircular sectional form and mask...http://www.google.com/patents/US7041229?utm_source=gb-gplus-sharePatent US7041229 - Patterned product and its manufacturing method
