1976-10-01
1978-02-14
Sacher, Paul A.
350200, G02B 304, G02B 1708
Patent
active
040735745
ABSTRACT:
An aspheric element, placed near a principle plane of an wide-angle, wide-aperture image forming system and having in its aspheric function a term proportional to the third power of the distance from the optic axis improves off-axis revolution.
REFERENCES:
patent: 2298808 (1942-10-01), Ramberg
A. K. Rigler, et al., "Spline Functions . . . ", Applied Optics, vol. 10, No. 7, Jul. 1971, pp. 1648-1651.
Clarke John A.
Howden Harry
Cohen Simon L.
Sacher Paul A.
Trifari Frank R.
U.S. Philips Corporation
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