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A display device is described for implementing the "mouse" cursor control by substituting an accelerometer plus integrators for the position displacement wheels currently used.
English (United States)
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Cursor Positioning Device
A display device is described for implementing the "mouse" cursor control by
substituting an accelerometer plus integrators for the position displacement
wheels currently used.
The mouse, described in , is used for positioning a cursor in a keyboard-
display workstation [1 and 2]. It is known that the mouse senses position by
means of two potentiometers mounted orthogonally, each of which has a wheel
attached to its shaft (not shown). By sliding the mouse on a desktop, the user
causes the wheels to turn, indicating change in position.
The device 10, shown in the drawing, includes an activator bar 12 for
initiating a change of position. X and Y arrows represent the directions of built-in
accelerometers which are used to drive internal integrating amplifiers having
outputs which represent the velocity components v(x)v(y). The user is taught to
depress the activator bar 12 with the heel of his hand before initiating any
horizontal motion. This delivers a start signal to the processing system.
Change of cursor position is initiated by depressing the activator bar 12 and
sliding the mouse horizontally in the desired direction. The cursor is frozen when
the activator bar 12 is released.
The v(x), v(y) signals from the analog integrators (not shown) in the mouse
are sampled and digitized by the system. In view of the slowness of arm
movements relative to the hand and finger movements used in writing, a
sampling rate of about 50 per second pe...