US 2016/0259100 A1 · LIGHT AMOUNT ADJUSTING DEVICE, LENS BARREL, AND IMAGE CAPTURING APPARATUS

Abstract

A light amount adjusting device includes ND filters rotating around shafts serving as rotation shafts and moving between in-use positions and retracted positions, arranged on a base plate. The respective ND filters include uniform density portions, gradation portions, and transparent portions. If the ND filters are in the retracted positions, the transparent portions of the respective ND filters overlap in an area facing an aperture to cover the entire aperture with the transparent portions. If the ND filters are in the in-use positions, the gradation portions of the respective ND filters overlap in an area facing the aperture to cover the entire aperture with the gradation portions and the uniform density portions. Moreover, a combined density acquired when the gradation portions overlap in just proportion is substantially the same as an optical density of each of the uniform density portions.

Claims9

Dependent claims

A light amount adjusting device that adjusts an amount of light passing through an aperture, the light amount adjusting device comprising:

a first filter, including a transparent area and a non-transparent area, configured to move between a retracted position and an in-use position in an area including an area facing the aperture;
and
a second filter, including a transparent area and non-transparent area, configured to move between a retracted position and an in-use position in an area including the area facing the aperture,
wherein, if the first filter and the second filter are in the retracted positions, the transparent area of the first filter and the transparent area of the second filter overlap in a position facing an entire area of the aperture, and
wherein, if the first filter and the second filter are in the in-use positions, the transparent area of the first filter and the non-transparent area of the second filter overlap in a position facing the aperture, and the non-transparent area of the first filter and the transparent area of the second filter overlap in a position facing the aperture.

2 more elements

Dependencies are inferred from the claim text.

Light amount adjusting device, lens barrel, and image capturing apparatus

Life of this patent

Light amount adjusting device, lens barrel, and image capturing apparatus

Life of this patent

Abstract

Claims9