Patent ID: 7405728

Claim:
A portable information terminal comprising: a display for displaying information; a scrolling device including a disc-shaped member capable of performing a rotating operation centered about an axis and capable of being pressed in the direction perpendicular to a planar surface of said disc-shaped member; said scrolling device enabling an operator to carry out a first operation and a second operation differing from said first operation; a first scrolling control device for performing said first operation and said second operation; wherein said first operation causes said display to scroll through information displayed at a first speed and said second operation causes said display to scroll through information displayed at a second speed slower than said first speed; and wherein the scrolling device comprises: a base; a holder mounted onto the base and including a dial support cylinder projecting perpendicularly from the center of the holder; a circular scale, including a central hole and slits positioned radially around the central hole, mounted onto the holder and having the dial support cylinder passing through the central hole thereof; a dial body, including a central hole, having a diameter greater that the circular scale, mounted onto the holder over the circular scale and having the dial support cylinder passing through the central hole thereof; the disc-shaped member including a central hole, mounted onto the holder over the dial body and having the dial support cylinder passing through the central hole thereof; and a cylindrical button having a diameter less than that of the dial support cylinder and positioned within the dial support cylinder.