Mutoh Industries Ltd.

Toru Eshita

Tetsuya Iwanaga

Hiroyuki Furuichi

Tatsuyoshi Ikuta

Ryuji Arai

Kaoru Niimi

Under a transparent board-like digitizer, a screen of the same size as that of the digitizer is positioned. Scenes of a display device is shown on the screen. A co-ordinates standard of the digitizer is set to be identical with that of the screen. Consequently, the point indicated on the digitizer of a first cursor device is shown at a position corresponding to that of the point indicated by means of the cursor. In a circle drawing mode of the digitizer, when the operator places the cursor device on the digitizer and co-ordinates data are inputted to a computer, a plot circle corresponding to the co-ordinates data is displayed on the screen. When the operator makes the plot circle by means of the cursor device, the computer selects a radial input system. On the other hand, when the operator uses the cursor device and selects the exterior of the plot circle, a transient point input system is selected. In an operation of the radial input system, the operator uses a key board or a command menu displayed on the screen in order to carry out an input operation. When the operator inputs a radial r to the computer, a circle with its radial r and its center corresponding to the center of the plot circle is drawn or displayed on the screen. In the transient point input system of the input device, when the operator hits any point on the digitizer by means of the cursor device, a circle having its center corresponding to the center of the plot circle and having its line passing on the point the cursor device hits is drawn.

Input device for CAD

A transparent board-like digitizer is placed near a display screen. Images of the same size as that of the digitizer images entered on the digitizer are displayed on the screen. A co-ordinates standard of the digitizer is set to be identical with that of the screen. Thereby, the point indicated on the digitizer of a first cursor device is shown at a position corresponding to that of the point indicated by the cursor. The screen displays right-angle scale lines controlled by a second cursor device on the digitizer. The right-angle scale lines can carry out parallel movements and rotations on the screen. When a straight line drawing is carried out, an operator indicates two points on the digitizer by means of the first and the second cursor devices and inputs the data of such two points, whereby a straight line connecting these two points, dimension supplemental lines in parallel with the right-angle scaling lines, dimension lines extending between the two points, and a dimension figure, respectively, are displayed on the screen.

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Tokyo, Japan

Toru Eshita