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Continuous curves such as elliptical, spherical, parabolic and hyperbolic cylindrical surfaces are formed by the use of a roller bending process.
English (United States)
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Process For Making Quadric Reflectors
Continuous curves such as elliptical, spherical, parabolic and hyperbolic
cylindrical surfaces are formed by the use of a roller bending process.
A roller machine includes two fixed position, parallel axes, metal rollers 10
and 11, one or both of which are driven to move a metal sheet of reflector
material 12 left to right. A digital stepping motor (not shown) controls the position
of roller 13, while maintaining this roller's axis always parallel to the axes of
rollers 10 and 11. A fixed feed rate of sheet 12 and a variable bending force
created by movement of roller 13 produces optical reflectors of a controlled
Once digital input for the stepping motor has been empirically established, to
produce a desired reflector curvature, this control is used respectively to produce
reflectors. The digitization does not appear in the reflective surface due to the
bend strength of sheet 12.
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