Patent ID: 8274747
Filing Date: 2012-09-25
Classification: G02B,H02N

Abstract:
1. A piezoelectric actuator comprising: a fixed barrel, the fixed barrel defining a first receiving cavity passing through two opposite ends thereof; a movable barrel received in the first receiving cavity, the movable barrel defining a second receiving cavity passing through two opposite ends thereof for receiving a lens module therein; a piezoelectric driving module for driving the movable barrel to move relative to the fixed barrel along an optical axis of the lens module, the piezoelectric driving module comprising a piezoelectric member arranged on a sidewall of the fixed barrel, and a friction member arranged on a sidewall of the movable barrel, the piezoelectric member being opposite to the friction member; a flexible circuit board fixed on an outer surface of the fixed barrel, the flexible circuit board being electrically connected with the piezoelectric member; a bracing sheet, the bracing sheet being attached around the flexible circuit board and fixing the piezoelectric member on the fixed barrel, and a preloading module arranged between the fixed barrel and the movable barrel, the preloading module being opposite to the piezoelectric driving module for exerting a pressure on the movable barrel, thereby making the friction member resist against the piezoelectric member.