Single-drive bidirectional disk-shaped linear piezoelectric motor

Abstract

The invention discloses a single-drive bidirectional disk-shaped linear piezoelectric motor, comprising a stator and a rotor, wherein the stator comprises a vibrator and at least two piezoelectric ceramic sheets symmetrically arranged at the both sides of the vibrator; the vibrator comprises a vibrator body and protruding parts in contact with the vibrator body and protruding relative to the vibrator body; a through hole is arranged on the protruding part; the through hole and the rotor are in interference fit; and the protruding directions of the two protruding parts are opposite. The piezoelectric motor uses a disk-shaped driving structure, and integrates a lens to be the rotor of the linear piezoelectric motor. Compared with a threaded driving type motor, the single-drive bidirectional disk-shaped linear piezoelectric motor has balance pre-stress, has no 'hula-hoop' motion and stable motion, and can realize a thinned design through a disk-shaped driving structure integrated with the lens. Furthermore, the bidirectional motion can be realized through one path of a driving signal circuit when the single-drive bidirectional disk-shaped linear piezoelectric motor is in use, and the microminiaturization and the simplification of the driving circuit can be realized better.

Description

technical field [0001] The invention relates to the field of micro-drive mechanisms, in particular to a single-drive bidirectional disc-shaped linear piezoelectric motor. Background technique [0002] Piezoelectric motors, as a precision piezoelectric drive element, are becoming key components in advanced technology products such as mobile phones, personal computers, medical imaging systems and other miniature medical devices. Compared with the traditional electromagnetic drive mechanism, the piezoelectric actuator has relatively high power density, large driving force and high driving step accuracy. [0003] At present, many researchers have devoted themselves to the development of miniature linear piezoelectric motors as precision drives, especially for miniature camera modules, but compared with the current rapid development of mobile phones, the micro Drive components are relatively lacking. Compared with traditional electromagnetic drive components (such as voice coil...

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Problems solved by technology

[0004] The piezoelectric drive mechanism used for lens drive includes screw drive type and direct drive type. The typical screw drive type is a micro piezoelectric motor-lens integrated drive mechanism disclosed in Chinese patent ZL200710022415.9, including ring Piezoelectric stator, rotor and drive power supply, wherein: the annular piezoelectric stator is provided with internal threads, the rotor is annular or cylindrical with external threads, and the rotor is integrated with the lens; the external threads of the rotor are connected with the The internal threads are matched; the rotor is screwed into the stator through mutually matched threads; its advantages are: a piezoelectric stator is provided with an ultra-thin ring structure, and the lens is directly driven as a part of the rotor, which has relatively higher driving force and efficiency , the screw drive also has the characteristics of insensitivity to vibration; since the piezoelectric element on the piezoelectric stator is a sheet-like or multi-layer sheet structure, the motor can be allowed to work at a lower voltage; since the motor and the lens drive mechanism contain fewer components, Relatively small in size and low in cost, it is especially suitable for automatic focusing and zooming of optical lenses in mobile phones and miniature camera modules; it integrates the lens into a screw in the screw drive mechanism, which has the advantages of compact structure, but it uses the screw drive principle, The lens is also doing a slight "hula hoop" movement during the focusing process, which will affect the focusing effect; in US Patent US6940209, a rod-shaped linear motor that works in a "Wobbling" manner is disclosed. It drives the linear movement of the screw through the principle of screw drive, and the screw drives the lens through an attached small ball and an elastic sheet. Although it can be made into a small-diameter rod-shaped structure, it has a longer length along the lens direction. It is not suitable for ultra-thin lens modules

The piezoelectric drive mechanism that uses the thread drive principle to realize linear drive has the disadvantage that it is not easy to load a constant preload

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