Selective shading device and an optical device using the same

Details Selective shading device and an optical device using the same Selective shading device and an optical device using the same

1986-05-23

1989-03-07

Corbin, John K.

350266, G02B 2602

Patent

active

048100765

ABSTRACT:
A selective shading device has a number of shading plates or planar members and a supporting body that holds the plates or planar members in such a manner that they are arrranged radially with respect to an optical axis. The device blocks sagittal bundles of rays. A preferred example of the supporting body is a cylindrical frame that holds the shading plates perpendicularly to the inner surface thereof. Alternatively, the shading planar members are formed within a lens element along the edge thereof.

REFERENCES:
patent: 531994 (1895-01-01), Gathmann
"Introduction to Optics", vol. 1, p. 123, published by Asakura-shoten, Japan.

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