Abstract: There is provided a roller screw comprising a screw shaft 1 having an outer peripheral surface in which a spiral roller rolling groove 1a is formed, a nut member 2 having an inner peripheral surface in which a spiral loaded roller rolling groove 2a is formed so as to oppose to the roller rolling groove of the screw shaft, a return pipe 4 in which a roller return passage 5 is formed so as to connect one and another ends of a loaded roller rolling passage 3 between the roller rolling groove 1a of the screw shaft 1 and the loaded roller rolling groove 2a of the nut member 2, a number of rollers 6 disposed in the loaded roller rolling passage 3 and the roller return passage 5, wherein the roller return passage 5 is twisted so that an attitude of the roller 6 changes as the roller moves in an axial direction of the return pipe 4. Such roller screw enables to provide an easy assembling and compact structure and to realize smooth circulation of the roller.

Abstract: A game apparatus includes two LCDs, a touch panel is provided in association with the one LCD. On the touch panel, an operation button corresponding to each player character is set. A setting of the operation button is changed according to an operation state (frequency of usage, operation coordinates position) by a player during playing the game. For example, a size of an operation effective area and a display position of the operation button are changed according to the frequency of usage. Furthermore, at least any one of the operation effective areas and the display position of the operation button is changed according to the operation coordinates position.

Abstract: A touch panel 13 is mounted on a second LCD 12. If the player touch-operates the touch panel 13 so as to touch on an offense button OB, the symbolized representation of any offense athlete among a plurality of player objects composing the player's team becomes relatively large. Thus, in a game where the action or settings of a game object image is changed by touch-operating the game object image, the image of a game object that is highly frequently operated in situations similar to the current situation is enlarged, thereby facilitating touch-operation.

Abstract: A first game image to be controlled by using an operation switch section 14 is displayed on a first LCD 11. In addition, a second game image to be controlled by using a touch panel 13 is displayed on a second LCD 12. The first game image and the second game image are expressions, taken from different perspectives, of the same game space generated by executing a game program.

Abstract: A ball screw unit is provided including a screw shaft having a helical ball rolling groove on the outer peripheral surface thereof; a nut fitted about the screw shaft, having a helical load rolling groove on the inner peripheral surface thereof for forming a helical load ball path in opposing relationship with the ball rolling groove of the screw shaft, and having a ball return path along the axis thereof; a pair of end caps arranged at both ends of the nut, each end cap having change of direction paths for establishing communication between ends of the load ball path and ends of ball return path of the nut respectively; and a number of balls inserted into an endless circulation path which is formed by the load ball path, the ball return path and the change of direction paths, and disposed to circulate through the endless circulation path following the rotation of the screw shaft relative to the nut; wherein each of the change of direction paths formed on the pair of end caps includes a guide groove for guidi