Iris type light quantity adjusting device, lens device, and...

Details Iris type light quantity adjusting device, lens device, and... Iris type light quantity adjusting device, lens device, and...

2005-03-15

2005-03-15

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S894000, C396S493000, C396S495000

Reexamination Certificate

active

06867932

ABSTRACT:
An iris type light quantity adjusting device is disclosed that includes:a plurality of shading blades, each shading blade pivoting around each shaft provided around a fixed opening in a fixed member. At least one shading blade has extended portion overlapping the other shading blade in order to keep overlapping order with the other shading blade that pivots around the shaft not adjacent to the shaft as a pivot of the abovementioned at least one shading blade.Each of the shading blades has one or none intersection between an outer edge of the shading blade at an outside in the direction orthogonal to the optical axis and a peripheral edge of the fixed opening within an entire pivoting range, and one of a pair of shading blades approaching from substantially opposite directions during pivoting to a closing direction has, at the tip thereof, a shape not overlapping the other shading blade in a closed position.

REFERENCES:
patent: 5598244 (1997-01-01), Johansson
patent: 5953550 (1999-09-01), Aoshima
patent: H02-48928 (1990-04-01), None
English translation of parts A-D of Japanese Utility Model Laid Open No. H02-48928.

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