Patent ID: 8180482
Filing Date: 2012-05-15
Classification: B28B,C04B,G02B,Y10S

Abstract:
1. A method for producing at least one rotationally symmetrical lens, said lens consisting of an opto-ceramic, comprising the following process step: moulding a green body using a moulding tool, wherein at least one surface of said lens is described by the following equation A: wherein x designates a perpendicular distance from an optical axis of said lens; y gives a position on the optical axis; k is a conic constant and has a value of −200 to +200; c=1/R wherein R is a radius of curvature of the at least one surface; a wherein the moulding tool comprises a near-net-shape negative mould for shaping the green body, said near-net-shape negative mould having a shaping surface, which is described by the following equation B: wherein x, k, c, a y z=|x|+b; and wherein b is a constant with a value greater than 0 and less than 0.3 mm and is a measure of a deviation of the shaping surface of the near-net-shape negative mould from the at least one surface of said lens to be moulded.