Piezoelectric actuated integral diaphragm

Abstract

The invention discloses a piezoelectric actuated integral diaphragm. An outer boss of a fixed coil generates a travelling wave by applying two-phase voltage through an inverse piezoelectric effect ofpiezoelectric ceramic; drive teeth of the fixed coil are in direct contact with a movable coil; elliptic motion on the drive teeth is converted into rotation of the movable coil through a friction effect; reverse motion of the movable coil can be achieved through changing a phase difference of voltage; the movable coil, the bottom surface of a fixed shell and balls form a bearing, so that assemblyof an additional bearing is avoided and the size of the integral diaphragm is reduced; diaphragm blades are hinged with the movable coil and are connected with an inner ring of the fixed coil throughsliding chutes; uni-circumferential motion of the blades is controlled through rotation of the movable coil; a plurality of blades are staggered with one another to form a round iris diaphragm; and abottom cover is connected with the fixed coil and a housing through bolts to play a role in applying prepressure. According to the piezoelectric actuated integral diaphragm, the volume of the diaphragm is reduced and the piezoelectric actuated integral diaphragm has the characteristics of being high in adjustment accuracy, fast in response, high in stability and high in reliability.

Description

technical field [0001] The invention relates to the aerospace field, in particular to a piezo-electrically driven integrated diaphragm. Background technique [0002] Precision video cameras and cameras have been widely used in important equipment such as space stations, space shuttles, and spacecraft to collect various information such as images. However, due to the difference in weather, lighting angle, and shooting target, the intensity of incident light will change greatly, which will seriously affect the acquisition of target information by the camera, such as: low resolution, low definition, low contrast, etc. As a dimming system, the diaphragm can adjust the intensity of the incident light by changing the size of the diaphragm, so as to maximize the quality of information collection. [0003] In the prior art, there are mainly two indirect driving methods to drive the moving coil to rotate. [0004] First, the stepper motor is used as the power source, and the moving...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the technical problems of the existing diaphragm with many parts, complex structure, large size and heavy weight. The present invention provides a piezoelectrically driven integrated diaphragm. The ultrasonic motor and diaphragm are designed The integrated structure has the advantages of less parts, simple structure, easy assembly, quick response, no magnetic field, high positioning accuracy, self-locking when power off, compact structure, small size, and light weight

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