Piezoelectric type moving system and lens driving device with same

Abstract

The invention provides a piezoelectric type moving system, which comprises a vibrating body, a moving body, a piezoelectric ceramic plate and a fixed shell. The vibrating body comprises an inner barrel and an outer barrel, wherein the moving body is fixedly accommodated in the inner barrel of the vibrating body; the outer barrel comprises an end wall and a side wall extending from a part close to the outer side of the end wall; the inner barrel are fixedly connected with a part close to the inner side of the end wall of the outer barrel through a connecting part; the piezoelectric ceramic plate is attached to the end wall of the outer barrel of the vibrating body; and the outer barrel is connected with the fixed shell in a sliding way. When the piezoelectric ceramic plate works, the vibrating body and the moving body can selectively move relative to the fixed shell along one direction of two opposite directions by a friction force and an inertia driving force between the outer barrel and the fixed shell. The invention also provides a lens driving device applying the piezoelectric type moving system. The lens driving device has the advantages of simple structure, low noise and electromagnetic interference resistance.

Description

technical field [0001] The invention relates to a piezoelectric motion system and a lens driving device with the motion system. Background technique [0002] With the popularity of portable camera devices such as camera phones and the diversification of their functions, portable camera devices with auto-focus lenses will have increasingly broad market prospects. The existing auto-focus portable camera devices on the market usually use electromagnetic induction motors, which have the advantages of high speed and high efficiency, but the disadvantages are that the positioning accuracy is not high, it cannot be quickly self-locked, and it is difficult to miniaturize, etc., which is not suitable for current applications. There is a trend towards smaller and smaller cameras for portable video cameras. [0003] Piezoelectric ceramics have the advantages of high positioning accuracy, low speed and high torque, simple structure, and no electromagnetic interference. They are now wi...

AI Technical Summary

Problems solved by technology

The advantages of resonance drive are fast speed and high efficiency, but the disadvantages are a series of problems such as overheating, noise, dust, etc.

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