Automatic diaphragm apparatus for lens

Details Automatic diaphragm apparatus for lens Automatic diaphragm apparatus for lens

1997-12-01

1999-03-16

Perkey, W. B.

Photography

Camera detail

Diaphragm

G03B 907

Patent

active

058841105

ABSTRACT:
An automatic diaphragm apparatus in a lens in which an aperture diameter is varied in accordance with a set diaphragm value, set by a diaphragm set ring in a first section from the maximum aperture to a predetermined intermediate aperture. The aperture diameter is kept constant regardless of the set diaphragm value of the diaphragm set ring in a second section, from the predetermined intermediate aperture to the minimum aperture. The apparatus includes a diaphragm data transmission member in the form of an arc shape lever having one end which pivots on the diaphragm set ring at an offset position from the optical axis. On the other end, a diaphragm data transmission projection is provided. The apparatus also includes a cam mechanism which is provided between the diaphragm data transmission lever and an immovable portion of the lens. The cam mechanism is for holding the position of the diaphragm data transmission projection in a constant position when the diaphragm set ring is rotated in the first section. The cam mechanism is also for rotating the diaphragm data transmission projection together with the diaphragm set ring when the diaphragm set ring is rotated in the second section.

REFERENCES:
patent: 4344688 (1982-08-01), Metabi
patent: 4464040 (1984-08-01), Okura et al.
patent: 5250971 (1993-10-01), Okura
patent: 5270759 (1993-12-01), Okura

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