An optical apparatus includes a vibrated member and a piezoelectric element. For example, the monitor beam may be collimated to allow an increase in spacing between the device outputting the light beam and a detector for sensing the monitor beam. The relevant information includes a description or discussion of a contemporaneous or previous experience of the enterprise regarding the problem, opportunity or event. A stress-balancing layer is either initially formed over the entire spring metal finger and then partially removed from the claw portion, or selectively deposited only on the anchor portion of the spring metal finger.