1990-01-29
1991-07-16
Brown, Brian W.
G03B 902
Patent
active
050328603
ABSTRACT:
A full closed type diaphragm apparatus having a complete light shut-off function comprises seven blade members made of thin plate and having respective pivot points rotatably supported in succession in a rotational direction about an optical axis and respective free end portions oriented in the rotational direction, and a rotating apparatus to simultaneously rotate the blade members by the same angle in the rotational direction about their respective pivot points. The blade members include at least one long blade member and a plurality of short blade members. As viewed along the optical axis, the arrangement is such that (i) the free end portion of the long blade member always overlaps the blade member supported third in succession therefrom, (ii) the free end portion of each short blade member always overlaps the blade member supported second in succession therefrom, and (iii) in at least a full closed state, there is interposed between each short blade member and the blade member supported third in succession therefrom the free end portion of one of the blade members supported first and second in succession from the short blade member, and between the long blade member and the blade member supported fourth in succession therefrom the free end portion of at least one of the blade members supported second and third in succession from the long blade member.
Blankenship Howard B.
Brown Brian W.
Nikon Corporation
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