Abstract: It is an object of present invention to effectively, separately use a game field image and an enlarged image relating to the neighborhood of a sight postion in the game field image. In a game system executing a shooting simulation of the like, a game field image is displayed on a screen of a predetermined monitor by a computer of the game system, a sight position in the game field image is changed in accordance with a player's postion select operation conducted to a predetermined input device, and an enlarged image relating to a predetermined range including the sight postion is displayed on the screen of the monitor. Further, a magnification of the enlarged image relative to the game field image is changed in accordance with a player's magnification switch operation conducted to the input device.

Abstract: It is an object of present invention to effectively, separately use a game field image and an enlarged image relating to the neighborhood of a sight position in the game field image.

Abstract: A sealed neutron tube is provided, in which an insulating structure is designed to be solid to enhance the shock-proof performance thereof, an ion beam drawn out from an ion source is pulsated more rapidly, and the lifetime of a target is increased without substantially increasing the filling amount of the Tritium. The sealed neutron tube (1) includes a metal housing (20), an ion source (5) disposed and sealed within the metal housing for ionizing a Deuterium gas, an accelerating electrode (4) charged with a high voltage, disposed and sealed within the metal housing and facing the ion source, and a target (3) disposed within the accelerating electrode and absorbing Tritium and the like therein. An outer wall (20) is constructed by a metal housing, and a ceramic insulating member (11) is disposed within the metal housing. Since the accelerating electrode is held by this insulating member, the outer wall of the sealed neutron tube has enhanced shock-proof performance.