An image blur correcting unit allows the optical axis of a lens system to coincide with the center of an imager, thus correcting an image blur. A second semiconductor substrate is stacked over a third semiconductor substrate, and a first semiconductor substrate is stacked over the second semiconductor substrate. The electrodes are constructed and arranged to provide data for determining a conductivity and permittivity of the fuel mixture. This bandgap reference voltage is formed using switched capacitors. The first end region may extend completely about the axis or just about a portion of the axis.