An optical disk writing method including determining a writing scheme for recording information on the optical disc based on received tracking error signals. A sealing portion is welded to a stem section of the neck, and stem pins holding the electron gun are buried in the sealing portion. Each of the capturing units comprises capturing elements having capturing characteristics specific to the capturing unit, and capturing elements having capturing characteristics common to a plurality of capturing units. The voice server identifies the data of interest, which may be stored at the voice server or at a data server associated with the voice server, based on the called number. The left side panel and the right side panel each comprise raised handle portions on an outer edge thereof. The cylinder movably supports the plunger therein.