Scanning objective

Details Scanning objective Scanning objective

1983-05-31

1987-02-24

Corbin, John K.

350478, 350480, G02B 906, G02B 912, G02B 1318

Patent

active

046453113

ABSTRACT:
A scanning objective with two optical elements, which includes at least one aspherical surface; the aspherical surface is so constructed that in comparison with a spherical surface with the same vertex radius of curvature, the thickness of the lens increases toward the outside. By this construction of the aspherical surface in accordance with the present invention, for example, a scanning objective with two lenses and an aspherical surface can be obtained which is limited in diffraction for small image scales.

REFERENCES:
patent: 697959 (1902-04-01), Abbe
patent: 2637242 (1953-05-01), Osterberg et al.
patent: 4352541 (1982-10-01), Minoura et al.

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