Amount-of-light adjusting device

Details Amount-of-light adjusting device Amount-of-light adjusting device

1994-08-09

1997-11-18

Mathews, A. A.

Photography

Camera detail

Diaphragm

396451, 396505, G03B 902

Patent

active

056897464

ABSTRACT:
To reduce the size of an optical apparatus having an amount-of-light adjusting device, there is provided an arrangement which comprises a light-blocking member arranged to move to vary a light-blocking area and a drive part for driving the light block member. The drive part includes a stator formed by a first stator piece having a first stator pole and a second stator piece having a second stator pole and a rotor made eccentric with respect to a central position of the first stator piece and the second stator piece. The drive part is disposed rearward of the light-blocking member in the direction of the optical axis.

REFERENCES:
patent: 4897681 (1990-01-01), Yamamoto et al.
patent: 5072162 (1991-12-01), Sato et al.
patent: 5117137 (1992-05-01), Kobayashi
patent: 5237357 (1993-08-01), Morisawa
patent: 5371633 (1994-12-01), Kawamura et al.
patent: 5418588 (1995-05-01), Chigira
patent: 5430519 (1995-07-01), Shimada et al.

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