Large-caliber fully-closed iris diaphragm device

Abstract

The invention provides a large-aperture fully-closed iris diaphragm device, and aims to solve the problems that the aperture adjustment range of an iris diaphragm is relatively small and the diaphragmcannot be completely closed in the prior art. The device comprises a mounting shell fixedly mounted on a diaphragm base, and a ball bearing, a diaphragm adjusting gear ring, an annular driving rotarydisc and at least three diaphragm blades which are positioned in the mounting shell, wherein the diaphragm blades are laminated on the mounting shell in sequence, the swinging end of the upper-layerdiaphragm blade and the fixed end of the lower-layer diaphragm blade are overlapped to form an annular structure, the side, away from the mounting shell, of the fixed end of the uppermost diaphragm blade in the annular structure is hinged to the inner ring of a ball bearing through a fixing pin, the sides, close to the mounting shell, of the fixed ends of the other diaphragm blades are hinged to the mounting shell through fixing pins, guide columns are arranged on the sides, away from the mounting shell, of the fixed ends of the diaphragm blades, guide grooves matched with the guide columns are formed in the annular driving rotary disc, and the guide columns extend into the guide grooves.

Description

technical field [0001] The invention relates to an aerial optical imaging device, in particular to a large-diameter fully-closed variable aperture device. Background technique [0002] With the wide application of aerial cameras in the field of remote sensing imaging, the camera is required to be able to adapt to the imaging requirements of low-light environment to high-light environment, which makes the camera system must have high dynamic imaging capability. High dynamic imaging capabilities are guaranteed by optical lenses with high dynamic adjustment capabilities and high-sensitivity imaging components. However, in strong bright light environments, the imaging energy acquired by high-sensitivity imaging components will cause severe overexposure of the image and affect the imaging quality. Through Shortening the exposure time of the imaging chip can reduce overexposure. Due to the limitation of the shortest exposure time of the imaging chip, it is necessary to adjust the ...

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