Light blocking device for optical lenses

Details Light blocking device for optical lenses Light blocking device for optical lenses

1991-03-22

1993-05-11

Ben, Loha

Optical: systems and elements

Lens

With light limiting or controlling means

359601, 359611, G02B 900

Patent

active

052106454

ABSTRACT:
This is to disclose an optical apparatus, comprising a plurality of optical lenses; and a plurality of light blocking plates or blocking member arranged in the direction of the optical axis for blocking harmful sagittal peripheral rays, the light blocking plates being installed in a ring shape at the pupil position of the optical lenses and being inclined, by an angle .alpha. respectively, to a plurality of imaginary planes including the optical axis.

REFERENCES:
patent: 3715149 (1973-02-01), Freeland
patent: 4810076 (1989-03-01), Murao et al.

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