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US 5,210,645 AGranted
Light blocking device for optical lenses
AssigneeCanon Kabushiki Kaisha
InventorsKanjo Orino, Shigeru Oshima
Life of this patent
Estimating the term…
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.
Claims13
An optical apparatus comprising:
- a plurality of optical lenses provided on an optical axis;
- and
- a plurality of light blocking plates for eliminating harmful light fluxes, said light blocking plates being inclined to a plurality of imaginary planes including said optical axis, by an angle .alpha., respectively.
An optical apparatus comprising:
- a plurality of optical lenses provided on an optical axis;
- and
- a plurality of projected elements extended toward said optical axis from a circumference away from said optical axis and aligned toward said optical axis, wherein said projected elements have a predetermined area in an imaginary plane, which is perpendicular to said optical axis, and said projected elements existing in a plural number within a circular area with said optical axis being the center.
Dependencies are inferred from the claim text.