Photographic lens device having a step motor mounted on the lens

Details Photographic lens device having a step motor mounted on the lens Photographic lens device having a step motor mounted on the lens

1982-07-22

1984-09-18

Mathews, A. A.

G03B 906

Patent

active

044720394

ABSTRACT:
A photographic lens device with a built-in electronic aperture-stop control system or mechanism comprising a step motor and an aperture-stop setting device which are spaced apart from each other by a suitable distance in the direction of the optical axis of the photographic lens system and are coupled to each other through a coupling means. In one embodiment, the aperture-stop control system can be incorporated in the lens device simply by slightly enlarging the diameter of the lens device or barrel without increasing its axial length because of full possible use of a heretofore unused dead space available in the lens device.

REFERENCES:
patent: 4005448 (1977-01-01), Iwata et al.
patent: 4113359 (1978-09-01), Koike et al.

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