US 6,724,541 B2Granted

Aperture regulating apparatus

AssigneeFuji Photo Optical Co., Ltd.

InventorYukio Noguchi

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Abstract

An aperture regulating apparatus includes a moving barrel moving straight in an optical axis direction, a rotation barrel rotatably held by the moving barrel, a cam member movably fitted on the moving barrel, and a shutter unit movably contained in the moving barrel. In moving the moving barrel in the optical axis direction by magnifying operation, the rotation barrel moves in the optical axis direction with the moving barrel with rotation, and the cam member moves in the optical axis direction on an outer surface of the moving barrel in accordance with rotation of the rotation barrel. The shutter unit has a regulation lever getting in rotational range of shutter blades. The regulation lever is displaced according to movement of the cam member to control a rotational amount of the shutter blades. An aperture size is regulated according to a focal length of a taking lens.

Claims10

Dependent claims

An aperture regulating apparatus for changing an aperture size in accordance with a magnifying power of a taking lens optical system, said aperture size being determined by an amount of movement of shutter blades moving within a vertical plane to an optical axis of said taking lens optical system, said aperture regulating apparatus comprising:

a moving barrel that moves straight in the direction of said optical axis in response to magnifying operation of said taking lens optical system;
a rotation barrel movably held by said moving barrel, said rotation barrel moving in said optical axis direction with rotation in cooperation with the straight movement of said moving barrel;
a cam member fitted on an outer surface of said moving barrel, said cam member moving straight in said optical axis direction relative to said moving barrel in accordance with rotation of said rotation barrel;
a shutter unit for holding said shutter blades, said shutter unit being contained inside said moving barrel;
and
a regulation lever engaged with said cam member, said regulation lever regulating movement of said shutter blades by being displaced in accordance with movement of said cam member in order to change said aperture size.

3 more elements

Dependencies are inferred from the claim text.