Threaded hollow revolution type travelling wave ultrasound motor

Abstract

The invention relates to a threaded hollow revolution type travelling wave ultrasound motor used for adjusting a diaphragm. The diaphragm comprises a diaphragm fixing ring and a diaphragm moving ring provided with a connecting rod, and the threaded hollow revolution type travelling wave ultrasound motor provided by the invention comprises a base, a piezoelectric ceramic piece, a friction material layer, a damping material layer as well as a stator shaft and a rotor shaft which are arranged in a hollow manner along an axis. The threaded hollow revolution type travelling wave ultrasound motor provided by the invention has the advantages that the infliction preliminary pressure is large, the regulation precision is high, the installation is convenient, the structure is simple, the torque output is large, and meanwhile, the threaded hollow revolution type travelling wave ultrasound motor is used for a diaphragm adjusting system. The threaded hollow revolution type travelling wave ultrasound motor provided by the invention is also suitable for a precision optical system which needs high diaphragm adjusting precision.

Description

technical field [0001] The patent of the present invention relates to an ultrasonic motor, in particular to a new structure rotary traveling wave ultrasonic motor with pre-pressure applied by threads and output by a hollow shaft, which can be used to adjust the diaphragm. Background technique [0002] The diaphragm is the device that controls how much the light beam passes through. It is mainly used to adjust the strength of the passing beam, etc. The diaphragm is usually composed of diaphragm blades, diaphragm moving coils, and fixed coils; and the movement of the diaphragm blades is controlled through the relative movement of the moving coil and the fixed coil, thereby realizing the adjustment of the diaphragm. At present, the aperture adjustment is realized by using an electromagnetic motor to drive a deceleration mechanism, which has a complicated structure and requires an additional deceleration mechanism, and the control accuracy is not high and the volume is large. ...

AI Technical Summary

Problems solved by technology

[0003] However, at present, most ultrasonic motors output torque with a solid shaft (such as Chinese patent: zl20102021943910). Due to its structural limitations, that is, the output of a solid shaft is used, and the optical path cannot pass through it, so it cannot be used in the diaphragm adjustment device.

The annular ultrasonic motor uses stacked springs to apply preload, and its output torque is small, which is not enough to drive the fixed coil and moving coil of the diaphragm to achieve relative motion.

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