Optical element having an aspheric surface

Details Optical element having an aspheric surface Optical element having an aspheric surface

1986-07-10

1988-04-19

Corbin, John K.

G02B 1318

Patent

active

047385162

ABSTRACT:
For manufacturing monaspherical lenses, a correction layer of a synthetic resin is provided on a substrate having a spherical surface. In this method, centering is performed by using the curvature of the surface of the matrix. With a correct choice of the radius of curvature of the substrate surface, the substrate approaches the matrix most closely near a collection of inflection points in the matrix surface situated on a circle. A good centering without a guiding mechanism is possible by using the method according to the invention. Moreover, the differences in thickness in the correction layer are small enough to prevent shrinkage defects upon curing of the synthetic resin layer.

REFERENCES:
patent: 3876734 (1975-04-01), Howden
patent: 4592627 (1986-06-01), Smid

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