Single-phase piezoelectric driven variable diaphragm device

Abstract

The invention discloses a single-phase piezoelectric driven variable diaphragm device. The device comprises a piezoelectric actuator, a moving coil, a shading sheet and a base. The piezoelectric actuator comprises a piezoelectric stator, a pin roller, left and right fixing plates, upper and lower heat conducting sheets, a spring sheet and a spring block; the piezoelectric stator is directly driven by a single-phase sinusoidal voltage, the driving foot is in direct contact with a sliding groove of the moving coil, and the elliptic motion of the driving foot is converted into the rotating motion of the moving coil through the friction effect; the side wall of the piezoelectric stator is in direct contact with the pin roller, and the pin roller, the left and right fixing plates, the spring sheet and the spring block play a role in limiting deformation of the piezoelectric stator; the moving coil is hinged to the anti-dazzling screen, and the anti-dazzling screen is driven to rotate in the circumferential direction through rotation of the moving coil, so that the clear aperture is expanded or shrunk; the two bearings are arranged on the base and play a role in limiting; and the motor end cover is connected with the base through a bolt. The size of the diaphragm is reduced, and the diaphragm device has the advantages of being compact in structure, easy to control, fast in response and high in precision.

Description

technical field [0001] The invention belongs to the field of aerospace optical instruments, in particular to a variable aperture device driven by single-phase piezoelectricity. Background technique [0002] In order to obtain a clear image, it is necessary to make the optical system achieve the best exposure under the change of illumination of the scene, and the light adjustment mechanism is an indispensable part of it, which is closely related to the image quality. The iris diaphragm is a commonly used dimming device to control the illuminance of the imaging surface. At present, the variable diaphragm is mainly composed of a shading film, a diaphragm moving coil, and a diaphragm fixed ring. The shading film and the moving coil are hingedly connected, and the relative rotation of the moving coil and the annular boss drives the rotation of the shading film to adjust the aperture of the diaphragm. Size, adjust the luminous flux entering the lens, so that the image plane can o...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a single-phase piezoelectric driven iris device to solve the technical problems of large volume and low precision existing in the existing iris.

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