| 摘要 |
<p>PURPOSE:To attain quick input of the shift of an indicating point on a CRT display device by operating a control board which is set up on a plane and can be tilted in all circumferential direction to open and close switches set equidistantly in four directions. CONSTITUTION:At least four switches 3 are set equidistantly and at the same angle centering on a bearing 2 on a cylindrical base 1. The bearing 2 supports a disk-shaped control board 4 via an oscillating shaft 5 set at the center of the rear side of the board 4. Thus the board 4 can be tilted in all direction by operating a control ball 7 unified with the board 4 within a palm. Then at least one of four switches 3 is closed by a contact ring 7 formed on the rear side of the board 4 as a circular projection. Thus the shift of an indicated point on a CRT display device is indicated to a processor.</p> |
