A method and an apparatus for determining displacement of a surface member coupled to a user interface mechanism, for example a joystick handle, using a fixed optical motion sensor. In a high-frequency mode, a damping force control is achieved through an open passage that is always opened. If an unused area exists, in the next predetermined time period, the storage area is decreased and the usage charge is reduced or is made free of, or the storage area is decreased as much as the capacity corresponding to the usage charge, so that a part of the unused storage area is canceled as an equivalent for the usage charge. The file assembly includes a plurality of file dividers located between the first and second files and are connected via accordion pleats. Accordingly, a solid-state image pickup device that allows acquiring a high-resolution image by correcting pixel data when any readout wiring line is disconnected is realized. This triple damascene structure uses three design rules while only requiring two etch mask layers, and only one planarizing or etch back stop to define the interconnect lines.