Moulded lenses


Aspherical surfaces perform the task of minimising the aperture error invariably found in any lens. In comparison with a spherical lens with a comparable diameter and focal length, aspherical lenses have a lower aperture error. Under certain conditions it is possible to improve image defects such as coma, distortion and astigmatism. Since grinding, as for spherical surfaces, is not possible on conventional machines, the aspherical lenses are moulded. We recommend limiting the use of moulded lenses to condenser optics and simple lighting systems. The lenses must be designed such that demoulding is possible: lenses can be supplied in an angular design with offset rim and in an array form version, for example.

standard specificatiions/general tolerances