Three-dimensional display of images of objects, comprises reproducing tomographic images of object side-by-side and arranging lens sections with different focal lengths along common optical axis so that new images are produced

摘要

Three-dimensional display of images of objects, comprises reproducing tomographic images of object side-by-side and arranging lens sections with different focal lengths along common optical axis so that new images are produced. Method for three-dimensional display of images of objects comprises reproducing tomographic images or partial images (b1 - b4) of the object side-by-side simultaneously or cyclically. A series of lens sections with different focal lengths (f1 -f4) are arranged along a common optical axis (5) so that new images (a1 - a4) of the tomographic images are produced at different distances along the optical axis which give a three-dimensional effect when viewed along it. The lens sections preferably consist of a multifocal Fresnel lens (2). An Independent claim is included for production of a multifocal lens from a moldable blank comprises making several press molding tools for forming annular lens surfaces of different focal lengths. These are then separated into strips, each corresponding to a sector of the lens surface. The sections are then assembled so that each strip corresponds to a lens surface of a particular focal length and adjacent strips produce surfaces of different focal length. The lens is then press molded using the new tool.