Mounting aspheres is often challenging because of the higher sensitivity to decenter and tilt compared with spherical lenses. This paper first describes aspheric surface decenter and tilt error as per ISO 10110 standard. Then, the most common lens mounting and alignment method for aspheric lenses are discussed in detail. Finally, an innovative mounting method that uses surface contact mounting is presented. This autocentering method uses the optical surfaces as mounting interfaces to provide a high level of centering accuracy for aspheric lenses. Centering measurement results for different aspheric lenses mounted using this method are also presented.
Mounting aspheres is often challenging because of the higher sensitivity to decenter and tilt compared to spherical lenses. This paper first describes aspheric surface decenter and tilt error as per ISO 10110 standard. Then, the most common lens mounting and alignment method for aspheric lenses are discussed in detail. Finally, an innovative mounting method that uses surface contact mounting is presented. This auto-centering method uses the optical surfaces as mounting interfaces to provide a high level of centering accuracy for aspheric lenses. Centering measurement results for different aspheric lenses mounted using this method are also presented.
Other than for spheres the decenter of an aspheric surface cannot be compensated for by further tilting. During tolerancing process of an optical system it is usually assumed that the surface form deviation, the wedge and tilt of a surface have the same origin of coordinates. When manufacturing a lens, the surface form deviation is measured with different machines than the wedge and decenter. Measuring the surface form, the software applies piston, tilt and decenter that differs from the wedge and decenter of the lens. The results of testing this effect with different measurement set-ups and a possible solution will be presented.
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