Miniature position sensor improves autofocus and zoom in digital still cameras

This application note describes how lens systems in digital still cameras and video cameras can be improved with the addition of a tiny new position sensor. New Scale's unique TRACKER position sensors are small enough to fit into existing camera designs. The sensors can be used to either upgrade existing open-loop stepper motor systems, or to replace existing optical encoders with a smaller, more precise sensor. In either case, the precise position feedback enables faster, more precise focus and/or zoom. The resulting lens system will use less power and cut the "wait time" for taking a photo. The increased precision will also allow designers to use smaller optics in their next product iterations.