Patent ID: 7782391

Claim:
A camera module comprising: a lens holder defining a receiving portion thereof; a lens module partially received in the receiving portion of the lens holder, the lens module comprising a lens barrel movably engaged in the lens holder and at least one lens received in the lens barrel; an image sensor chip comprising a photosensitive area configured for receiving light transmitted through the lens module, and a plurality of chip pads formed surrounding the photosensitive area; a circuit board comprising a top surface thereof for engaging with the lens holder, the circuit board comprising a first recess at an upper portion thereof, a second recess at a lower portion thereof and an intermediate step surface formed between the first recess and the second recess, the first recess provided for receiving the image sensor chip therein, the second recess provided for receiving at least one electronic element mounted on the bottom of the second recess, and at least one zero voltage point formed on the intermediate step surface thereof for adjusting the voltage of a plurality of conductors connected to the at least one zero voltage point to zero; a cover plate attached on the intermediate step surface for covering the at least one electronic element received in the second recess, the cover plate having at least one external point formed on the bottom of the cover plate to connect to a corresponding zero voltage point; and wherein the cover plate is electrically connected to a plurality of zero voltage points by a plurality of external points, the cover plate being configured for preventing electromagnetic waves generated by the at least one electronic element from affecting the image sensor chip.