Ergonomic computer input device

Abstract

A computer input device that comfortably supports the hand of the user while the thumb and fingers are associated with buttons, a trackball, and a scrolling wheel carried on the device. The overall configuration of the device and the arrangement of these actuators permit the user to easily and effectively operate all of the functions provided by the actuators while the hand and arm of the user are in a comfortable position. The device includes a housing having an asymmetrical dividing ridge forming a “thumb-side surface,” for placement of the thumb, and a “finger-side surface,” for placement of the remaining four fingers. The finger-side surface includes a ball rotatably mounted in the housing and further includes first and second input buttons disposed to the side of the ball which may be used as “forward” and “back” buttons. The first and second input buttons adjacent to the ball may be replaced by a linearly slidable or pivotally movable actuator. The movable member is preferably of the three-position-type enabling the user to activate the movable member in a forward or a backward direction for transmission of respective signals to the computer. The thumb-side surface includes a horizontally-disposed scrolling wheel and third and fourth buttons on opposite sides of the scrolling wheel that can be used as “primary” and “secondary” buttons. The primary button has a curved bottom portion that serves as a thumb rest, and may be used as such without activating the button as the button is movable laterally towards the fingers.