Patent ID: 7542667

Claim:
A digital camera unit, comprising: a barrel configured to be fixed relative to a body of the digital camera unit; a fixed lens member mounted in the barrel; a movable lens member slidably assembled in the barrel; a piezoelectric element attached to the movable lens member and configured to be fixed relative to the body of the digital camera unit, the piezoelectric element being configured for selectably positioning the movable lens member in the barrel, the piezoelectric element including a hollow, cylindrical substrate and a piezoelectric portion, the piezoelectric portion being coaxial with the substrate; an image sensor configured for being fixedly mounted relative to the body of the digital camera unit, the image sensor being arranged at one side of the barrel, the image sensor facing the fixed lens member and the movable lens member, the image sensor being configured for outputting image data received thereby; and a power supply configured for supplying a selectable direct current to the piezoelectric element, an anode and a cathode being respectively connected to two different positions on the piezoelectric portion, the distance separating the movable lens member and the image sensor being dependent upon the amount of current supplied to the piezoelectric element.