Drive module and electronic device

A drive module comprising:

• a lens frame;
• a supporting member for storing the lens frame therein;
• a pair of leaf spring members provided so as to hold the lens frame therebetween in an optical axis direction for elastically holding the lens frame so that the lens frame would be movable with respect to the supporting member along the optical axis direction;
• a shape memory alloy wire having both end portions held on the supporting member and a midsection locked on a locking portion of the lens frame for driving the lens frame toward one leaf spring member of the pair of leaf spring members against restoring force of the leaf spring members by contraction due to generation of heat in turning on the electricity;
• a base plate fixed to the supporting member so as to hold the other leaf spring member of the pair of leaf members between the base plate and the supporting member;
• and
• a bias spring member for urging the lens frame toward the base plate through the locking portion to make the lens frame come in contact with the base plate through the other leaf spring member,
• the drive module wherein
• the lens frame is provided with a pre-pressure portion for generating urging force for initially deforming one leaf spring member to urge the lens frame toward the base plate and for holding a balance with the bias spring member in the case of no electricity transmitted to the shape memory alloy wire to keep the contact condition of the lens frame.