Lens device and image capturing apparatus having the same
AssigneeFUJIFILM Corporation
InventorsArihiro SAITA, Shigehiro KANAYAMA, Minoru TANAKA
Life of this patent
Estimating the term…
Abstract
A lens device (2) is provided with a first operating ring (11) for adjusting the opening surface area of an aperture device (15) and a second operating ring (12) for adjusting the transmittance of a variable light transmittance filter (16). The correspondence relation between the operational amount for the first operating ring and the rate of change in the amount of light transmitted by the aperture device and correspondence relation between the operational amount for the second operating ring and the rate of change in the amount of light transmitted by the variable light transmittance filter are the same.
Claims18
A lens device for an image capturing apparatus incorporating a photographing lens and a diaphragm device configured to narrow an aperture area, the lens device comprising:
- a cylindrical housing that incorporates the photographing lens and the diaphragm device;
- a first operation ring that is mounted on an outer peripheral portion of the housing to be rotatable in a circumferential direction of the outer peripheral portion so as to adjust the aperture area of the diaphragm device;
- and
- a second operation ring that is mounted on the outer peripheral portion of the housing in parallel to the first operation ring to be rotatable coaxially with the first operation ring so as to adjust a transmittance of a light transmittance variable filter,
- wherein a correspondence relationship between an operation amount of the first operation ring and a change rate of an amount of transmitted light of the diaphragm device, and a correspondence relationship between an operation amount of the second operation ring and a change rate of an amount of transmitted light of the light transmittance variable filter are set to be the same.
Dependencies are inferred from the claim text.