Photographic lens unit and photographing method

Photography – Flash system responsive to focal length or distance – Illumination angle responds to focal length or distance

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Details

396132, G03B 1334, G03B 1503

Patent

active

059786027

ABSTRACT:
A photographic lens unit having a stepping motor to drive a cam ring that has a cam portion for driving a counter-cam portion of a lens frame for automatic focus of photographic lenses, and projections for driving a diaphragm. The cam ring is rotated for moving the counter-cam portion in an optical-axis direction with the counter-cam portion in contact with the cam portion. Automatic focus of the photographic lenses and photometry are carried out. Thereafter, the cam ring is further rotated so that the projection can bring the diaphragm to an aperture-narrowing state. The cam ring is then rotated reversely for moving the photographic lenses to an automatic focus position. Photographic operations are then carried out. After photography is completed, the diaphragm is reset by moving the counter-cam portion. The photographic lens unit is thus brought to a ready state for subsequent photography. According to this photographic lens unit, since the driven part enabling automatic focus and the diaphragm can be driven by a simple driving mechanism, the structure of the photographic lens unit can be simplified and a space occupied by the photographic lens unit can be limited.

REFERENCES:
patent: 5311239 (1994-05-01), SanGregory et al.
patent: 5710949 (1998-01-01), Akimoto et al.

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