| 摘要 |
PURPOSE:To make a data input efficient without increasing the number of keys, by displaying a key data picture of microfiche on the key top, on a keyboard inputting many kinds of characters and many items. CONSTITUTION:A lamp 101 is placed at a focal point of a convex lens 102 and gives parallel rays to the convex lens 102. The light passing through a convex lens 103 transmits through a microfiches 105 having a board surface data picture placed within the focal point of the convex lens 103, the key picture is projected on a key board surface screen 107 by a projection lens 15 to light the key label of a keyboard 108 on the key board surface screen 107. A key input code is generated at a key address sensing circuit 109 by depressing the key of the keyboard 108. |
