There is provided an optical system for an optical disc drive. The gas outlet is in fluid communication with the gas source and the gas outlet is configured to provide gas to an exposed surface of the nozzle plate so that the gas flow is substantially parallel to the surface of the nozzle plate. In addition, the embedded data collection and storage device may collect transaction data concerning handheld transactions as well as vending machine error transactions, including timestamps. In a plurality of openings in the interlayer insulating film, one electrode group having a plurality of electrodes is formed on one N-type region, while a second electrode group having a plurality of electrodes is formed on the other N-type region.